/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * Highlighting stuff.
 */

#include "vim.h"

#define SG_TERM		1	// term has been set
#define SG_CTERM	2	// cterm has been set
#define SG_GUI		4	// gui has been set
#define SG_LINK		8	// link has been set

#define MAX_SYN_NAME	200

/*
 * The "term", "cterm" and "gui" arguments can be any combination of the
 * following names, separated by commas (but no spaces!).
 */
static char *(hl_name_table[]) =
    {"bold", "standout", "underline",
	"undercurl", "underdouble", "underdotted", "underdashed",
	"italic", "reverse", "inverse", "nocombine", "strikethrough", "NONE"};
static int hl_attr_table[] =
    {HL_BOLD, HL_STANDOUT, HL_UNDERLINE,
	HL_UNDERCURL, HL_UNDERDOUBLE, HL_UNDERDOTTED, HL_UNDERDASHED,
	HL_ITALIC, HL_INVERSE, HL_INVERSE, HL_NOCOMBINE, HL_STRIKETHROUGH, 0};
// length of all attribute names, plus commas, together (and a bit more)
#define MAX_ATTR_LEN 120

#define ATTR_COMBINE(attr_a, attr_b) ((((attr_b) & HL_NOCOMBINE) ? (attr_b) : (attr_a)) | (attr_b))

/*
 * Structure that stores information about a highlight group.
 * The ID of a highlight group is also called group ID.  It is the index in
 * the highlight_ga array PLUS ONE.
 */
typedef struct
{
    char_u	*sg_name;	// highlight group name
    char_u	*sg_name_u;	// uppercase of sg_name
    int		sg_cleared;	// "hi clear" was used
// for normal terminals
    int		sg_term;	// "term=" highlighting attributes
    char_u	*sg_start;	// terminal string for start highl
    char_u	*sg_stop;	// terminal string for stop highl
    int		sg_term_attr;	// Screen attr for term mode
// for color terminals
    int		sg_cterm;	// "cterm=" highlighting attr
    int		sg_cterm_bold;	// bold attr was set for light color
    int		sg_cterm_fg;	// terminal fg color number + 1
    int		sg_cterm_bg;	// terminal bg color number + 1
    int		sg_cterm_ul;	// terminal ul color number + 1
    int		sg_cterm_attr;	// Screen attr for color term mode
// for when using the GUI
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    guicolor_T	sg_gui_fg;	// GUI foreground color handle
    guicolor_T	sg_gui_bg;	// GUI background color handle
    guicolor_T	sg_gui_sp;	// GUI special color handle
#endif
#ifdef FEAT_GUI
    GuiFont	sg_font;	// GUI font handle
#ifdef FEAT_XFONTSET
    GuiFontset	sg_fontset;	// GUI fontset handle
#endif
    char_u	*sg_font_name;  // GUI font or fontset name
    int		sg_gui_attr;    // Screen attr for GUI mode
#endif
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
// Store the sp color name for the GUI or synIDattr()
    int		sg_gui;		// "gui=" highlighting attributes
    char_u	*sg_gui_fg_name;// GUI foreground color name
    char_u	*sg_gui_bg_name;// GUI background color name
    char_u	*sg_gui_sp_name;// GUI special color name
#endif
    int		sg_link;	// link to this highlight group ID
    int		sg_deflink;	// default link; restored in highlight_clear()
    int		sg_set;		// combination of SG_* flags
#ifdef FEAT_EVAL
    sctx_T	sg_deflink_sctx;  // script where the default link was set
    sctx_T	sg_script_ctx;	// script in which the group was last set
#endif
} hl_group_T;

// highlight groups for 'highlight' option
static garray_T highlight_ga;
#define HL_TABLE()	((hl_group_T *)((highlight_ga.ga_data)))

/*
 * An attribute number is the index in attr_table plus ATTR_OFF.
 */
#define ATTR_OFF (HL_ALL + 1)

static void syn_unadd_group(void);
static void set_hl_attr(int idx);
static void highlight_list_one(int id);
static int highlight_list_arg(int id, int didh, int type, int iarg, char_u *sarg, char *name);
static int syn_add_group(char_u *name);
static int hl_has_settings(int idx, int check_link);
static void highlight_clear(int idx);

#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
static void gui_do_one_color(int idx, int do_menu, int do_tooltip);
#endif
#ifdef FEAT_GUI
static int  set_group_colors(char_u *name, guicolor_T *fgp, guicolor_T *bgp, int do_menu, int use_norm, int do_tooltip);
static void hl_do_font(int idx, char_u *arg, int do_normal, int do_menu, int do_tooltip, int free_font);
#endif

/*
 * The default highlight groups.  These are compiled-in for fast startup and
 * they still work when the runtime files can't be found.
 * When making changes here, also change runtime/colors/default.vim!
 * The #ifdefs are needed to reduce the amount of static data.  Helps to make
 * the 16 bit DOS (museum) version compile.
 */
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
# define CENT(a, b) b
#else
# define CENT(a, b) a
#endif
static char *(highlight_init_both[]) = {
    CENT("ErrorMsg term=standout ctermbg=DarkRed ctermfg=White",
	 "ErrorMsg term=standout ctermbg=DarkRed ctermfg=White guibg=Red guifg=White"),
    CENT("IncSearch term=reverse cterm=reverse",
	 "IncSearch term=reverse cterm=reverse gui=reverse"),
    CENT("ModeMsg term=bold cterm=bold",
	 "ModeMsg term=bold cterm=bold gui=bold"),
    CENT("NonText term=bold ctermfg=Blue",
	 "NonText term=bold ctermfg=Blue gui=bold guifg=Blue"),
    CENT("StatusLine term=reverse,bold cterm=reverse,bold",
	 "StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold"),
    CENT("StatusLineNC term=reverse cterm=reverse",
	 "StatusLineNC term=reverse cterm=reverse gui=reverse"),
    "default link EndOfBuffer NonText",
    CENT("VertSplit term=reverse cterm=reverse",
	 "VertSplit term=reverse cterm=reverse gui=reverse"),
#ifdef FEAT_CLIPBOARD
    CENT("VisualNOS term=underline,bold cterm=underline,bold",
	 "VisualNOS term=underline,bold cterm=underline,bold gui=underline,bold"),
#endif
#ifdef FEAT_DIFF
    CENT("DiffText term=reverse cterm=bold ctermbg=Red",
	 "DiffText term=reverse cterm=bold ctermbg=Red gui=bold guibg=Red"),
#endif
    CENT("PmenuSbar ctermbg=Grey",
	 "PmenuSbar ctermbg=Grey guibg=Grey"),
    CENT("TabLineSel term=bold cterm=bold",
	 "TabLineSel term=bold cterm=bold gui=bold"),
    CENT("TabLineFill term=reverse cterm=reverse",
	 "TabLineFill term=reverse cterm=reverse gui=reverse"),
#ifdef FEAT_GUI
    "Cursor guibg=fg guifg=bg",
    "lCursor guibg=fg guifg=bg", // should be different, but what?
#endif
    "default link QuickFixLine Search",
    "default link CursorLineSign SignColumn",
    "default link CursorLineFold FoldColumn",
    "default link CurSearch Search",
    CENT("Normal cterm=NONE", "Normal gui=NONE"),
    NULL
};

// Default colors only used with a light background.
static char *(highlight_init_light[]) = {
    CENT("Directory term=bold ctermfg=DarkBlue",
	 "Directory term=bold ctermfg=DarkBlue guifg=Blue"),
    CENT("LineNr term=underline ctermfg=Brown",
	 "LineNr term=underline ctermfg=Brown guifg=Brown"),
    CENT("CursorLineNr term=bold cterm=underline ctermfg=Brown",
	 "CursorLineNr term=bold cterm=underline ctermfg=Brown gui=bold guifg=Brown"),
    CENT("MoreMsg term=bold ctermfg=DarkGreen",
	 "MoreMsg term=bold ctermfg=DarkGreen gui=bold guifg=SeaGreen"),
    CENT("Question term=standout ctermfg=DarkGreen",
	 "Question term=standout ctermfg=DarkGreen gui=bold guifg=SeaGreen"),
    CENT("Search term=reverse ctermbg=Yellow ctermfg=NONE",
	 "Search term=reverse ctermbg=Yellow ctermfg=NONE guibg=Yellow guifg=NONE"),
#ifdef FEAT_SPELL
    CENT("SpellBad term=reverse ctermbg=LightRed",
	 "SpellBad term=reverse ctermbg=LightRed guisp=Red gui=undercurl"),
    CENT("SpellCap term=reverse ctermbg=LightBlue",
	 "SpellCap term=reverse ctermbg=LightBlue guisp=Blue gui=undercurl"),
    CENT("SpellRare term=reverse ctermbg=LightMagenta",
	 "SpellRare term=reverse ctermbg=LightMagenta guisp=Magenta gui=undercurl"),
    CENT("SpellLocal term=underline ctermbg=Cyan",
	 "SpellLocal term=underline ctermbg=Cyan guisp=DarkCyan gui=undercurl"),
#endif
    CENT("PmenuThumb ctermbg=Black",
	 "PmenuThumb ctermbg=Black guibg=Black"),
    CENT("Pmenu ctermbg=LightMagenta ctermfg=Black",
	 "Pmenu ctermbg=LightMagenta ctermfg=Black guibg=LightMagenta"),
    CENT("PmenuSel ctermbg=LightGrey ctermfg=Black",
	 "PmenuSel ctermbg=LightGrey ctermfg=Black guibg=Grey"),
    CENT("SpecialKey term=bold ctermfg=DarkBlue",
	 "SpecialKey term=bold ctermfg=DarkBlue guifg=Blue"),
    CENT("Title term=bold ctermfg=DarkMagenta",
	 "Title term=bold ctermfg=DarkMagenta gui=bold guifg=Magenta"),
    CENT("WarningMsg term=standout ctermfg=DarkRed",
	 "WarningMsg term=standout ctermfg=DarkRed guifg=Red"),
    CENT("WildMenu term=standout ctermbg=Yellow ctermfg=Black",
	 "WildMenu term=standout ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black"),
#ifdef FEAT_FOLDING
    CENT("Folded term=standout ctermbg=Grey ctermfg=DarkBlue",
	 "Folded term=standout ctermbg=Grey ctermfg=DarkBlue guibg=LightGrey guifg=DarkBlue"),
    CENT("FoldColumn term=standout ctermbg=Grey ctermfg=DarkBlue",
	 "FoldColumn term=standout ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue"),
#endif
#ifdef FEAT_SIGNS
    CENT("SignColumn term=standout ctermbg=Grey ctermfg=DarkBlue",
	 "SignColumn term=standout ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue"),
#endif
    CENT("Visual term=reverse",
	 "Visual term=reverse guibg=LightGrey"),
#ifdef FEAT_DIFF
    CENT("DiffAdd term=bold ctermbg=LightBlue",
	 "DiffAdd term=bold ctermbg=LightBlue guibg=LightBlue"),
    CENT("DiffChange term=bold ctermbg=LightMagenta",
	 "DiffChange term=bold ctermbg=LightMagenta guibg=LightMagenta"),
    CENT("DiffDelete term=bold ctermfg=Blue ctermbg=LightCyan",
	 "DiffDelete term=bold ctermfg=Blue ctermbg=LightCyan gui=bold guifg=Blue guibg=LightCyan"),
#endif
    CENT("TabLine term=underline cterm=underline ctermfg=black ctermbg=LightGrey",
	 "TabLine term=underline cterm=underline ctermfg=black ctermbg=LightGrey gui=underline guibg=LightGrey"),
#ifdef FEAT_SYN_HL
    CENT("CursorColumn term=reverse ctermbg=LightGrey",
	 "CursorColumn term=reverse ctermbg=LightGrey guibg=Grey90"),
    CENT("CursorLine term=underline cterm=underline",
	 "CursorLine term=underline cterm=underline guibg=Grey90"),
    CENT("ColorColumn term=reverse ctermbg=LightRed",
	 "ColorColumn term=reverse ctermbg=LightRed guibg=LightRed"),
#endif
#ifdef FEAT_CONCEAL
    CENT("Conceal ctermbg=DarkGrey ctermfg=LightGrey",
	 "Conceal ctermbg=DarkGrey ctermfg=LightGrey guibg=DarkGrey guifg=LightGrey"),
#endif
    CENT("MatchParen term=reverse ctermbg=Cyan",
	 "MatchParen term=reverse ctermbg=Cyan guibg=Cyan"),
#ifdef FEAT_TERMINAL
    CENT("StatusLineTerm term=reverse,bold cterm=bold ctermfg=White ctermbg=DarkGreen",
	 "StatusLineTerm term=reverse,bold cterm=bold ctermfg=White ctermbg=DarkGreen gui=bold guifg=bg guibg=DarkGreen"),
    CENT("StatusLineTermNC term=reverse ctermfg=White ctermbg=DarkGreen",
	 "StatusLineTermNC term=reverse ctermfg=White ctermbg=DarkGreen guifg=bg guibg=DarkGreen"),
#endif
#ifdef FEAT_MENU
    CENT("ToolbarLine term=underline ctermbg=LightGrey",
	 "ToolbarLine term=underline ctermbg=LightGrey guibg=LightGrey"),
    CENT("ToolbarButton cterm=bold ctermfg=White ctermbg=DarkGrey",
	 "ToolbarButton cterm=bold ctermfg=White ctermbg=DarkGrey gui=bold guifg=White guibg=Grey40"),
#endif
    NULL
};

// Default colors only used with a dark background.
static char *(highlight_init_dark[]) = {
    CENT("Directory term=bold ctermfg=LightCyan",
	 "Directory term=bold ctermfg=LightCyan guifg=Cyan"),
    CENT("LineNr term=underline ctermfg=Yellow",
	 "LineNr term=underline ctermfg=Yellow guifg=Yellow"),
    CENT("CursorLineNr term=bold cterm=underline ctermfg=Yellow",
	 "CursorLineNr term=bold cterm=underline ctermfg=Yellow gui=bold guifg=Yellow"),
    CENT("MoreMsg term=bold ctermfg=LightGreen",
	 "MoreMsg term=bold ctermfg=LightGreen gui=bold guifg=SeaGreen"),
    CENT("Question term=standout ctermfg=LightGreen",
	 "Question term=standout ctermfg=LightGreen gui=bold guifg=Green"),
    CENT("Search term=reverse ctermbg=Yellow ctermfg=Black",
	 "Search term=reverse ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black"),
    CENT("SpecialKey term=bold ctermfg=LightBlue",
	 "SpecialKey term=bold ctermfg=LightBlue guifg=Cyan"),
#ifdef FEAT_SPELL
    CENT("SpellBad term=reverse ctermbg=Red",
	 "SpellBad term=reverse ctermbg=Red guisp=Red gui=undercurl"),
    CENT("SpellCap term=reverse ctermbg=Blue",
	 "SpellCap term=reverse ctermbg=Blue guisp=Blue gui=undercurl"),
    CENT("SpellRare term=reverse ctermbg=Magenta",
	 "SpellRare term=reverse ctermbg=Magenta guisp=Magenta gui=undercurl"),
    CENT("SpellLocal term=underline ctermbg=Cyan",
	 "SpellLocal term=underline ctermbg=Cyan guisp=Cyan gui=undercurl"),
#endif
    CENT("PmenuThumb ctermbg=White",
	 "PmenuThumb ctermbg=White guibg=White"),
    CENT("Pmenu ctermbg=Magenta ctermfg=Black",
	 "Pmenu ctermbg=Magenta ctermfg=Black guibg=Magenta"),
    CENT("PmenuSel ctermbg=Black ctermfg=DarkGrey",
	 "PmenuSel ctermbg=Black ctermfg=DarkGrey guibg=DarkGrey"),
    CENT("Title term=bold ctermfg=LightMagenta",
	 "Title term=bold ctermfg=LightMagenta gui=bold guifg=Magenta"),
    CENT("WarningMsg term=standout ctermfg=LightRed",
	 "WarningMsg term=standout ctermfg=LightRed guifg=Red"),
    CENT("WildMenu term=standout ctermbg=Yellow ctermfg=Black",
	 "WildMenu term=standout ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black"),
#ifdef FEAT_FOLDING
    CENT("Folded term=standout ctermbg=DarkGrey ctermfg=Cyan",
	 "Folded term=standout ctermbg=DarkGrey ctermfg=Cyan guibg=DarkGrey guifg=Cyan"),
    CENT("FoldColumn term=standout ctermbg=DarkGrey ctermfg=Cyan",
	 "FoldColumn term=standout ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan"),
#endif
#ifdef FEAT_SIGNS
    CENT("SignColumn term=standout ctermbg=DarkGrey ctermfg=Cyan",
	 "SignColumn term=standout ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan"),
#endif
    CENT("Visual term=reverse",
	 "Visual term=reverse guibg=DarkGrey"),
#ifdef FEAT_DIFF
    CENT("DiffAdd term=bold ctermbg=DarkBlue",
	 "DiffAdd term=bold ctermbg=DarkBlue guibg=DarkBlue"),
    CENT("DiffChange term=bold ctermbg=DarkMagenta",
	 "DiffChange term=bold ctermbg=DarkMagenta guibg=DarkMagenta"),
    CENT("DiffDelete term=bold ctermfg=Blue ctermbg=DarkCyan",
	 "DiffDelete term=bold ctermfg=Blue ctermbg=DarkCyan gui=bold guifg=Blue guibg=DarkCyan"),
#endif
    CENT("TabLine term=underline cterm=underline ctermfg=white ctermbg=DarkGrey",
	 "TabLine term=underline cterm=underline ctermfg=white ctermbg=DarkGrey gui=underline guibg=DarkGrey"),
#ifdef FEAT_SYN_HL
    CENT("CursorColumn term=reverse ctermbg=DarkGrey",
	 "CursorColumn term=reverse ctermbg=DarkGrey guibg=Grey40"),
    CENT("CursorLine term=underline cterm=underline",
	 "CursorLine term=underline cterm=underline guibg=Grey40"),
    CENT("ColorColumn term=reverse ctermbg=DarkRed",
	 "ColorColumn term=reverse ctermbg=DarkRed guibg=DarkRed"),
#endif
    CENT("MatchParen term=reverse ctermbg=DarkCyan",
	 "MatchParen term=reverse ctermbg=DarkCyan guibg=DarkCyan"),
#ifdef FEAT_CONCEAL
    CENT("Conceal ctermbg=DarkGrey ctermfg=LightGrey",
	 "Conceal ctermbg=DarkGrey ctermfg=LightGrey guibg=DarkGrey guifg=LightGrey"),
#endif
#ifdef FEAT_TERMINAL
    CENT("StatusLineTerm term=reverse,bold cterm=bold ctermfg=Black ctermbg=LightGreen",
	 "StatusLineTerm term=reverse,bold cterm=bold ctermfg=Black ctermbg=LightGreen gui=bold guifg=bg guibg=LightGreen"),
    CENT("StatusLineTermNC term=reverse ctermfg=Black ctermbg=LightGreen",
	 "StatusLineTermNC term=reverse ctermfg=Black ctermbg=LightGreen guifg=bg guibg=LightGreen"),
#endif
#ifdef FEAT_MENU
    CENT("ToolbarLine term=underline ctermbg=DarkGrey",
	 "ToolbarLine term=underline ctermbg=DarkGrey guibg=Grey50"),
    CENT("ToolbarButton cterm=bold ctermfg=Black ctermbg=LightGrey",
	 "ToolbarButton cterm=bold ctermfg=Black ctermbg=LightGrey gui=bold guifg=Black guibg=LightGrey"),
#endif
    NULL
};

#if defined(FEAT_SYN_HL) || defined(PROTO)
/*
 * Returns the number of highlight groups.
 */
    int
highlight_num_groups(void)
{
    return highlight_ga.ga_len;
}

/*
 * Returns the name of a highlight group.
 */
    char_u *
highlight_group_name(int id)
{
    return HL_TABLE()[id].sg_name;
}

/*
 * Returns the ID of the link to a highlight group.
 */
    int
highlight_link_id(int id)
{
    return HL_TABLE()[id].sg_link;
}
#endif

    void
init_highlight(
    int		both,	    // include groups where 'bg' doesn't matter
    int		reset)	    // clear group first
{
    int		i;
    char	**pp;
    static int	had_both = FALSE;
#ifdef FEAT_EVAL
    char_u	*p;

    // Try finding the color scheme file.  Used when a color file was loaded
    // and 'background' or 't_Co' is changed.
    p = get_var_value((char_u *)"g:colors_name");
    if (p != NULL)
    {
	// The value of g:colors_name could be freed when sourcing the script,
	// making "p" invalid, so copy it.
	char_u *copy_p = vim_strsave(p);
	int    r;

	if (copy_p != NULL)
	{
	    r = load_colors(copy_p);
	    vim_free(copy_p);
	    if (r == OK)
		return;
	}
    }

#endif

    // Didn't use a color file, use the compiled-in colors.
    if (both)
    {
	had_both = TRUE;
	pp = highlight_init_both;
	for (i = 0; pp[i] != NULL; ++i)
	    do_highlight((char_u *)pp[i], reset, TRUE);
    }
    else if (!had_both)
	// Don't do anything before the call with both == TRUE from main().
	// Not everything has been setup then, and that call will overrule
	// everything anyway.
	return;

    if (*p_bg == 'l')
	pp = highlight_init_light;
    else
	pp = highlight_init_dark;
    for (i = 0; pp[i] != NULL; ++i)
	do_highlight((char_u *)pp[i], reset, TRUE);

    // Reverse looks ugly, but grey may not work for 8 colors.  Thus let it
    // depend on the number of colors available.
    // With 8 colors brown is equal to yellow, need to use black for Search fg
    // to avoid Statement highlighted text disappears.
    // Clear the attributes, needed when changing the t_Co value.
    if (t_colors > 8)
	do_highlight((char_u *)(*p_bg == 'l'
		    ? "Visual cterm=NONE ctermbg=LightGrey"
		    : "Visual cterm=NONE ctermbg=DarkGrey"), FALSE, TRUE);
    else
    {
	do_highlight((char_u *)"Visual cterm=reverse ctermbg=NONE",
								 FALSE, TRUE);
	if (*p_bg == 'l')
	    do_highlight((char_u *)"Search ctermfg=black", FALSE, TRUE);
    }

#ifdef FEAT_SYN_HL
    // If syntax highlighting is enabled load the highlighting for it.
    if (get_var_value((char_u *)"g:syntax_on") != NULL)
    {
	static int	recursive = 0;

	if (recursive >= 5)
	    emsg(_(e_recursive_loop_loading_syncolor_vim));
	else
	{
	    ++recursive;
	    (void)source_runtime((char_u *)"syntax/syncolor.vim", DIP_ALL);
	    --recursive;
	}
    }
#endif
}

#if defined(FEAT_EVAL) && (defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS))
/*
 * Load a default color list. Intended to support legacy color names but allows
 * the user to override the color values. Only loaded once.
 */
    static void
load_default_colors_lists()
{
    // Lacking a default color list isn't the end of the world but it is likely
    // an inconvenience so users should know when it is missing.
    if (source_runtime((char_u *)"colors/lists/default.vim", DIP_ALL) != OK)
	msg("failed to load colors/lists/default.vim");
}
#endif

/*
 * Load color file "name".
 * Return OK for success, FAIL for failure.
 */
    int
load_colors(char_u *name)
{
    char_u	*buf;
    int		retval = FAIL;
    static int	recursive = FALSE;

    // When being called recursively, this is probably because setting
    // 'background' caused the highlighting to be reloaded.  This means it is
    // working, thus we should return OK.
    if (recursive)
	return OK;

    recursive = TRUE;
    buf = alloc(STRLEN(name) + 12);
    if (buf != NULL)
    {
#if defined(FEAT_EVAL) && (defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS))
	load_default_colors_lists();
#endif
	apply_autocmds(EVENT_COLORSCHEMEPRE, name,
					       curbuf->b_fname, FALSE, curbuf);
	sprintf((char *)buf, "colors/%s.vim", name);
	retval = source_runtime(buf, DIP_START + DIP_OPT);
	vim_free(buf);
	if (retval == OK)
	    apply_autocmds(EVENT_COLORSCHEME, name, curbuf->b_fname,
								FALSE, curbuf);
    }
    recursive = FALSE;

    return retval;
}

static char *(color_names[28]) = {
	    "Black", "DarkBlue", "DarkGreen", "DarkCyan",
	    "DarkRed", "DarkMagenta", "Brown", "DarkYellow",
	    "Gray", "Grey", "LightGray", "LightGrey",
	    "DarkGray", "DarkGrey",
	    "Blue", "LightBlue", "Green", "LightGreen",
	    "Cyan", "LightCyan", "Red", "LightRed", "Magenta",
	    "LightMagenta", "Yellow", "LightYellow", "White", "NONE"};
	    // indices:
	    // 0, 1, 2, 3,
	    // 4, 5, 6, 7,
	    // 8, 9, 10, 11,
	    // 12, 13,
	    // 14, 15, 16, 17,
	    // 18, 19, 20, 21, 22,
	    // 23, 24, 25, 26, 27
static int color_numbers_16[28] = {0, 1, 2, 3,
				 4, 5, 6, 6,
				 7, 7, 7, 7,
				 8, 8,
				 9, 9, 10, 10,
				 11, 11, 12, 12, 13,
				 13, 14, 14, 15, -1};
// for xterm with 88 colors...
static int color_numbers_88[28] = {0, 4, 2, 6,
				 1, 5, 32, 72,
				 84, 84, 7, 7,
				 82, 82,
				 12, 43, 10, 61,
				 14, 63, 9, 74, 13,
				 75, 11, 78, 15, -1};
// for xterm with 256 colors...
static int color_numbers_256[28] = {0, 4, 2, 6,
				 1, 5, 130, 3,
				 248, 248, 7, 7,
				 242, 242,
				 12, 81, 10, 121,
				 14, 159, 9, 224, 13,
				 225, 11, 229, 15, -1};
// for terminals with less than 16 colors...
static int color_numbers_8[28] = {0, 4, 2, 6,
				 1, 5, 3, 3,
				 7, 7, 7, 7,
				 0+8, 0+8,
				 4+8, 4+8, 2+8, 2+8,
				 6+8, 6+8, 1+8, 1+8, 5+8,
				 5+8, 3+8, 3+8, 7+8, -1};

/*
 * Lookup the "cterm" value to be used for color with index "idx" in
 * color_names[].
 * "boldp" will be set to TRUE or FALSE for a foreground color when using 8
 * colors, otherwise it will be unchanged.
 */
    static int
lookup_color(int idx, int foreground, int *boldp)
{
    int		color = color_numbers_16[idx];
    char_u	*p;

    // Use the _16 table to check if it's a valid color name.
    if (color < 0)
	return -1;

    if (t_colors == 8)
    {
	// t_Co is 8: use the 8 colors table
#if defined(__QNXNTO__)
	// On qnx, the 8 & 16 color arrays are the same
	if (STRNCMP(T_NAME, "qansi", 5) == 0)
	    color = color_numbers_16[idx];
	else
#endif
	    color = color_numbers_8[idx];
	if (foreground)
	{
	    // set/reset bold attribute to get light foreground
	    // colors (on some terminals, e.g. "linux")
	    if (color & 8)
		*boldp = TRUE;
	    else
		*boldp = FALSE;
	}
	color &= 7;	// truncate to 8 colors
    }
    else if (t_colors == 16 || t_colors == 88
					   || t_colors >= 256)
    {
	// Guess: if the termcap entry ends in 'm', it is
	// probably an xterm-like terminal.  Use the changed
	// order for colors.
	if (*T_CAF != NUL)
	    p = T_CAF;
	else
	    p = T_CSF;
	if (*p != NUL && (t_colors > 256
			      || *(p + STRLEN(p) - 1) == 'm'))
	{
	    if (t_colors == 88)
		color = color_numbers_88[idx];
	    else if (t_colors >= 256)
		color = color_numbers_256[idx];
	    else
		color = color_numbers_8[idx];
	}
#ifdef FEAT_TERMRESPONSE
	if (t_colors >= 256 && color == 15 && is_mac_terminal)
	    // Terminal.app has a bug: 15 is light grey. Use white
	    // from the color cube instead.
	    color = 231;
#endif
    }
    return color;
}

/*
 * Link highlight group 'from_hg' to 'to_hg'.
 * 'dodefault' is set to TRUE for ":highlight default link".
 * 'forceit' is set to TRUE for ":highlight! link"
 * 'init' is set to TRUE when initializing all the highlight groups.
 */
    static void
highlight_group_link(
	char_u	*from_hg,
	int	from_len,
	char_u	*to_hg,
	int	to_len,
	int	dodefault,
	int	forceit,
	int	init)
{
    int		from_id;
    int		to_id;
    hl_group_T	*hlgroup = NULL;

    from_id = syn_check_group(from_hg, from_len);
    if (STRNCMP(to_hg, "NONE", 4) == 0)
	to_id = 0;
    else
	to_id = syn_check_group(to_hg, to_len);

    if (from_id > 0)
    {
	hlgroup = &HL_TABLE()[from_id - 1];
	if (dodefault && (forceit || hlgroup->sg_deflink == 0))
	{
	    hlgroup->sg_deflink = to_id;
#ifdef FEAT_EVAL
	    hlgroup->sg_deflink_sctx = current_sctx;
	    hlgroup->sg_deflink_sctx.sc_lnum += SOURCING_LNUM;
#endif
	}
    }

    if (from_id > 0 && (!init || hlgroup->sg_set == 0))
    {
	// Don't allow a link when there already is some highlighting
	// for the group, unless '!' is used
	if (to_id > 0 && !forceit && !init
		&& hl_has_settings(from_id - 1, dodefault))
	{
	    if (SOURCING_NAME == NULL && !dodefault)
		emsg(_(e_group_has_settings_highlight_link_ignored));
	}
	else if (hlgroup->sg_link != to_id
#ifdef FEAT_EVAL
		|| hlgroup->sg_script_ctx.sc_sid != current_sctx.sc_sid
#endif
		|| hlgroup->sg_cleared)
	{
	    if (!init)
		hlgroup->sg_set |= SG_LINK;
	    hlgroup->sg_link = to_id;
#ifdef FEAT_EVAL
	    hlgroup->sg_script_ctx = current_sctx;
	    hlgroup->sg_script_ctx.sc_lnum += SOURCING_LNUM;
#endif
	    hlgroup->sg_cleared = FALSE;
	    redraw_all_later(UPD_SOME_VALID);

	    // Only call highlight_changed() once after multiple changes.
	    need_highlight_changed = TRUE;
	}
    }

}

/*
 * Reset all highlighting to the defaults. Removes all highlighting for the
 * groups added by the user.
 */
    static void
highlight_reset_all(void)
{
    int		idx;

#ifdef FEAT_GUI
    // First, we do not destroy the old values, but allocate the new
    // ones and update the display. THEN we destroy the old values.
    // If we destroy the old values first, then the old values
    // (such as GuiFont's or GuiFontset's) will still be displayed but
    // invalid because they were free'd.
    if (gui.in_use)
    {
# ifdef FEAT_BEVAL_TIP
	gui_init_tooltip_font();
# endif
# if defined(FEAT_MENU) && defined(FEAT_GUI_MOTIF)
	gui_init_menu_font();
# endif
    }
# if defined(FEAT_GUI_MSWIN) || defined(FEAT_GUI_X11)
    gui_mch_def_colors();
# endif
# ifdef FEAT_GUI_X11
#  ifdef FEAT_MENU

    // This only needs to be done when there is no Menu highlight
    // group defined by default, which IS currently the case.
    gui_mch_new_menu_colors();
#  endif
    if (gui.in_use)
    {
	gui_new_scrollbar_colors();
#  ifdef FEAT_BEVAL_GUI
	gui_mch_new_tooltip_colors();
#  endif
#  ifdef FEAT_MENU
	gui_mch_new_menu_font();
#  endif
    }
# endif

    // Ok, we're done allocating the new default graphics items.
    // The screen should already be refreshed at this point.
    // It is now Ok to clear out the old data.
#endif
#ifdef FEAT_EVAL
    do_unlet((char_u *)"g:colors_name", TRUE);
#endif
    restore_cterm_colors();

    // Clear all default highlight groups and load the defaults.
    for (idx = 0; idx < highlight_ga.ga_len; ++idx)
	highlight_clear(idx);
    init_highlight(TRUE, TRUE);
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    if (USE_24BIT)
	highlight_gui_started();
    else
#endif
	highlight_changed();
    redraw_later_clear();
}

/*
 * Set the 'term' or 'cterm' or 'gui' attributes for the highlight group at
 * index 'idx'.
 * 'key' is one of 'TERM' or 'CTERM' or 'GUI'
 * 'arg' is the list of attribute names separated by comma.
 * 'init' is set to TRUE when initializing all the highlight groups.
 * Returns TRUE if the attributes are set.
 */
    static int
highlight_set_termgui_attr(int idx, char_u *key, char_u *arg, int init)
{
    int		attr;
    int		off;
    long	i;
    int		len;

    attr = 0;
    off = 0;
    while (arg[off] != NUL)
    {
	for (i = ARRAY_LENGTH(hl_attr_table); --i >= 0; )
	{
	    len = (int)STRLEN(hl_name_table[i]);
	    if (STRNICMP(arg + off, hl_name_table[i], len) == 0)
	    {
		attr |= hl_attr_table[i];
		off += len;
		break;
	    }
	}
	if (i < 0)
	{
	    semsg(_(e_illegal_value_str), arg);
	    return FALSE;
	}
	if (arg[off] == ',')		// another one follows
	    ++off;
    }
    if (*key == 'T')
    {
	if (!init || !(HL_TABLE()[idx].sg_set & SG_TERM))
	{
	    if (!init)
		HL_TABLE()[idx].sg_set |= SG_TERM;
	    HL_TABLE()[idx].sg_term = attr;
	}
    }
    else if (*key == 'C')
    {
	if (!init || !(HL_TABLE()[idx].sg_set & SG_CTERM))
	{
	    if (!init)
		HL_TABLE()[idx].sg_set |= SG_CTERM;
	    HL_TABLE()[idx].sg_cterm = attr;
	    HL_TABLE()[idx].sg_cterm_bold = FALSE;
	}
    }
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
    else
    {
	if (!init || !(HL_TABLE()[idx].sg_set & SG_GUI))
	{
	    if (!init)
		HL_TABLE()[idx].sg_set |= SG_GUI;
	    HL_TABLE()[idx].sg_gui = attr;
	}
    }
#endif

    return TRUE;
}

#ifdef FEAT_GUI
/*
 * Set the font for the highlight group at 'idx'.
 * 'arg' is the font name.
 * Returns TRUE if the font is changed.
 */
    static int
highlight_set_font(
	int	idx,
	char_u	*arg,
	int	is_normal_group,
	int	is_menu_group,
	int	is_tooltip_group)
{
    int		did_change = FALSE;

    // in non-GUI fonts are simply ignored
    if (HL_TABLE()[idx].sg_font_name != NULL
	    && STRCMP(HL_TABLE()[idx].sg_font_name, arg) == 0)
    {
	// Font name didn't change, ignore.
    }
    else if (!gui.shell_created)
    {
	// GUI not started yet, always accept the name.
	vim_free(HL_TABLE()[idx].sg_font_name);
	HL_TABLE()[idx].sg_font_name = vim_strsave(arg);
	did_change = TRUE;
    }
    else
    {
	GuiFont temp_sg_font = HL_TABLE()[idx].sg_font;
# ifdef FEAT_XFONTSET
	GuiFontset temp_sg_fontset = HL_TABLE()[idx].sg_fontset;
# endif
	// First, save the current font/fontset.
	// Then try to allocate the font/fontset.
	// If the allocation fails, HL_TABLE()[idx].sg_font OR
	// sg_fontset will be set to NOFONT or NOFONTSET respectively.

	HL_TABLE()[idx].sg_font = NOFONT;
# ifdef FEAT_XFONTSET
	HL_TABLE()[idx].sg_fontset = NOFONTSET;
# endif
	hl_do_font(idx, arg, is_normal_group, is_menu_group,
		is_tooltip_group, FALSE);

# ifdef FEAT_XFONTSET
	if (HL_TABLE()[idx].sg_fontset != NOFONTSET)
	{
	    // New fontset was accepted. Free the old one, if there
	    // was one.
	    gui_mch_free_fontset(temp_sg_fontset);
	    vim_free(HL_TABLE()[idx].sg_font_name);
	    HL_TABLE()[idx].sg_font_name = vim_strsave(arg);
	    did_change = TRUE;
	}
	else
	    HL_TABLE()[idx].sg_fontset = temp_sg_fontset;
# endif
	if (HL_TABLE()[idx].sg_font != NOFONT)
	{
	    // New font was accepted. Free the old one, if there was
	    // one.
	    gui_mch_free_font(temp_sg_font);
	    vim_free(HL_TABLE()[idx].sg_font_name);
	    HL_TABLE()[idx].sg_font_name = vim_strsave(arg);
	    did_change = TRUE;
	}
	else
	    HL_TABLE()[idx].sg_font = temp_sg_font;
    }

    return did_change;
}
#endif

/*
 * Set the cterm foreground color for the Normal highlight group to "color" and
 * the bold attribute to "bold".
 */
    static void
hl_set_ctermfg_normal_group(int color, int bold)
{
    cterm_normal_fg_color = color + 1;
    cterm_normal_fg_bold = bold;
#ifdef FEAT_GUI
    // Don't do this if the GUI is used.
    if (!gui.in_use && !gui.starting)
#endif
    {
	set_must_redraw(UPD_CLEAR);
	if (termcap_active && color >= 0)
	    term_fg_color(color);
    }
}

/*
 * Set the cterm foreground color for the highlight group at 'idx' to 'color'.
 */
    static void
highlight_set_ctermfg(int idx, int color, int is_normal_group)
{
    HL_TABLE()[idx].sg_cterm_fg = color + 1;
    if (is_normal_group)
	hl_set_ctermfg_normal_group(color,
					(HL_TABLE()[idx].sg_cterm & HL_BOLD));
}

/*
 * Set the cterm background color for the Normal highlight group to "color".
 */
    static void
hl_set_ctermbg_normal_group(int color)
{
    cterm_normal_bg_color = color + 1;
#ifdef FEAT_GUI
    // Don't mess with 'background' if the GUI is used.
    if (!gui.in_use && !gui.starting)
#endif
    {
	set_must_redraw(UPD_CLEAR);
	if (color >= 0)
	{
	    int dark = -1;

	    if (termcap_active)
		term_bg_color(color);
	    if (t_colors < 16)
		dark = (color == 0 || color == 4);
	    // Limit the heuristic to the standard 16 colors
	    else if (color < 16)
		dark = (color < 7 || color == 8);
	    // Set the 'background' option if the value is
	    // wrong.
	    if (dark != -1
		    && dark != (*p_bg == 'd')
		    && !option_was_set((char_u *)"bg"))
	    {
		set_option_value_give_err((char_u *)"bg",
			0L, (char_u *)(dark ? "dark" : "light"), 0);
		reset_option_was_set((char_u *)"bg");
	    }
	}
    }
}

/*
 * Set the cterm background color for the highlight group at 'idx' to 'color'.
 */
    static void
highlight_set_ctermbg(int idx, int color, int is_normal_group)
{
    HL_TABLE()[idx].sg_cterm_bg = color + 1;
    if (is_normal_group)
	hl_set_ctermbg_normal_group(color);
}

/*
 * Set the cterm underline color for the Normal highlight group to "color".
 */
    static void
hl_set_ctermul_normal_group(int color)
{
    cterm_normal_ul_color = color + 1;
#ifdef FEAT_GUI
    // Don't do this if the GUI is used.
    if (!gui.in_use && !gui.starting)
#endif
    {
	set_must_redraw(UPD_CLEAR);
	if (termcap_active && color >= 0)
	    term_ul_color(color);
    }
}

/*
 * Set the cterm underline color for the highlight group at 'idx' to 'color'.
 */
    static void
highlight_set_ctermul(int idx, int color, int is_normal_group)
{
    HL_TABLE()[idx].sg_cterm_ul = color + 1;
    if (is_normal_group)
	hl_set_ctermul_normal_group(color);
}

/*
 * Set the cterm fg/bg/ul color for the highlight group at 'idx'.
 * 'key' is one of 'CTERMFG' or 'CTERMBG' or 'CTERMUL'.
 * 'keystart' is the color name/value.
 * 'arg' is the color name or the numeric value as a string.
 * 'is_normal_group' is set if the highlight group is 'NORMAL'
 * 'init' is set to TRUE when initializing highlighting.
 * Called for the ":highlight" command and the "hlset()" function.
 *
 * Returns TRUE if the color is set.
 */
    static int
highlight_set_cterm_color(
	int	idx,
	char_u	*key,
	char_u	*key_start,
	char_u	*arg,
	int	is_normal_group,
	int	init)
{
    int		color;
    long	i;
    int		off;

    if (init && (HL_TABLE()[idx].sg_set & SG_CTERM))
	return FALSE;

    if (!init)
	HL_TABLE()[idx].sg_set |= SG_CTERM;

    // When setting the foreground color, and previously the "bold"
    // flag was set for a light color, reset it now
    if (key[5] == 'F' && HL_TABLE()[idx].sg_cterm_bold)
    {
	HL_TABLE()[idx].sg_cterm &= ~HL_BOLD;
	HL_TABLE()[idx].sg_cterm_bold = FALSE;
    }

    if (VIM_ISDIGIT(*arg))
	color = atoi((char *)arg);
    else if (STRICMP(arg, "fg") == 0)
    {
	if (cterm_normal_fg_color)
	    color = cterm_normal_fg_color - 1;
	else
	{
	    emsg(_(e_fg_color_unknown));
	    return FALSE;
	}
    }
    else if (STRICMP(arg, "bg") == 0)
    {
	if (cterm_normal_bg_color > 0)
	    color = cterm_normal_bg_color - 1;
	else
	{
	    emsg(_(e_bg_color_unknown));
	    return FALSE;
	}
    }
    else if (STRICMP(arg, "ul") == 0)
    {
	if (cterm_normal_ul_color > 0)
	    color = cterm_normal_ul_color - 1;
	else
	{
	    emsg(_(e_ul_color_unknown));
	    return FALSE;
	}
    }
    else
    {
	int bold = MAYBE;

	// reduce calls to STRICMP a bit, it can be slow
	off = TOUPPER_ASC(*arg);
	for (i = ARRAY_LENGTH(color_names); --i >= 0; )
	    if (off == color_names[i][0]
		    && STRICMP(arg + 1, color_names[i] + 1) == 0)
		break;
	if (i < 0)
	{
	    semsg(_(e_color_name_or_number_not_recognized_str), key_start);
	    return FALSE;
	}

	color = lookup_color(i, key[5] == 'F', &bold);

	// set/reset bold attribute to get light foreground
	// colors (on some terminals, e.g. "linux")
	if (bold == TRUE)
	{
	    HL_TABLE()[idx].sg_cterm |= HL_BOLD;
	    HL_TABLE()[idx].sg_cterm_bold = TRUE;
	}
	else if (bold == FALSE)
	    HL_TABLE()[idx].sg_cterm &= ~HL_BOLD;
    }

    // Add one to the argument, to avoid zero.  Zero is used for
    // "NONE", then "color" is -1.
    if (key[5] == 'F')
	highlight_set_ctermfg(idx, color, is_normal_group);
    else if (key[5] == 'B')
	highlight_set_ctermbg(idx, color, is_normal_group);
    else // ctermul
	highlight_set_ctermul(idx, color, is_normal_group);

    return TRUE;
}

#if defined(FEAT_GUI) || defined(FEAT_EVAL)
/*
 * Set the GUI foreground color for the highlight group at 'idx'.
 * Returns TRUE if the color is set.
 */
    static int
highlight_set_guifg(
	int	idx,
	char_u	*arg,
	int	is_menu_group UNUSED,
	int	is_scrollbar_group UNUSED,
	int	is_tooltip_group UNUSED,
	int	*do_colors UNUSED,
	int	init)
{
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    long	i;
# endif
    char_u	**namep;
    int		did_change = FALSE;

    if (init && (HL_TABLE()[idx].sg_set & SG_GUI))
	return FALSE;

    namep = &HL_TABLE()[idx].sg_gui_fg_name;
    if (!init)
	HL_TABLE()[idx].sg_set |= SG_GUI;

# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    // In GUI guifg colors are only used when recognized
    i = color_name2handle(arg);
    if (i != INVALCOLOR || STRCMP(arg, "NONE") == 0 || !USE_24BIT)
    {
	HL_TABLE()[idx].sg_gui_fg = i;
# endif
	if (*namep == NULL || STRCMP(*namep, arg) != 0)
	{
	    vim_free(*namep);
	    if (STRCMP(arg, "NONE") != 0)
		*namep = vim_strsave(arg);
	    else
		*namep = NULL;
	    did_change = TRUE;
	}
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
#  ifdef FEAT_GUI_X11
	if (is_menu_group && gui.menu_fg_pixel != i)
	{
	    gui.menu_fg_pixel = i;
	    *do_colors = TRUE;
	}
	if (is_scrollbar_group && gui.scroll_fg_pixel != i)
	{
	    gui.scroll_fg_pixel = i;
	    *do_colors = TRUE;
	}
#   ifdef FEAT_BEVAL_GUI
	if (is_tooltip_group && gui.tooltip_fg_pixel != i)
	{
	    gui.tooltip_fg_pixel = i;
	    *do_colors = TRUE;
	}
#   endif
#  endif
    }
# endif

    return did_change;
}

/*
 * Set the GUI background color for the highlight group at 'idx'.
 * Returns TRUE if the color is set.
 */
    static int
highlight_set_guibg(
	int	idx,
	char_u	*arg,
	int	is_menu_group UNUSED,
	int	is_scrollbar_group UNUSED,
	int	is_tooltip_group UNUSED,
	int	*do_colors UNUSED,
	int	init)
{
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    int		i;
# endif
    char_u	**namep;
    int		did_change = FALSE;

    if (init && (HL_TABLE()[idx].sg_set & SG_GUI))
	return FALSE;

    namep = &HL_TABLE()[idx].sg_gui_bg_name;
    if (!init)
	HL_TABLE()[idx].sg_set |= SG_GUI;

# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    // In GUI guibg colors are only used when recognized
    i = color_name2handle(arg);
    if (i != INVALCOLOR || STRCMP(arg, "NONE") == 0 || !USE_24BIT)
    {
	HL_TABLE()[idx].sg_gui_bg = i;
# endif
	if (*namep == NULL || STRCMP(*namep, arg) != 0)
	{
	    vim_free(*namep);
	    if (STRCMP(arg, "NONE") != 0)
		*namep = vim_strsave(arg);
	    else
		*namep = NULL;
	    did_change = TRUE;
	}
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
#  ifdef FEAT_GUI_X11
	if (is_menu_group && gui.menu_bg_pixel != i)
	{
	    gui.menu_bg_pixel = i;
	    *do_colors = TRUE;
	}
	if (is_scrollbar_group && gui.scroll_bg_pixel != i)
	{
	    gui.scroll_bg_pixel = i;
	    *do_colors = TRUE;
	}
#   ifdef FEAT_BEVAL_GUI
	if (is_tooltip_group && gui.tooltip_bg_pixel != i)
	{
	    gui.tooltip_bg_pixel = i;
	    *do_colors = TRUE;
	}
#   endif
#  endif
    }
# endif

    return did_change;
}

/*
 * Set the GUI undercurl/strikethrough color for the highlight group at 'idx'.
 * Returns TRUE if the color is set.
 */
    static int
highlight_set_guisp(int idx, char_u *arg, int init)
{
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    int		i;
# endif
    int		did_change = FALSE;
    char_u	**namep;

    if (init && (HL_TABLE()[idx].sg_set & SG_GUI))
	return FALSE;

    namep = &HL_TABLE()[idx].sg_gui_sp_name;
    if (!init)
	HL_TABLE()[idx].sg_set |= SG_GUI;

# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    // In GUI guisp colors are only used when recognized
    i = color_name2handle(arg);
    if (i != INVALCOLOR || STRCMP(arg, "NONE") == 0 || !USE_24BIT)
    {
	HL_TABLE()[idx].sg_gui_sp = i;
# endif
	if (*namep == NULL || STRCMP(*namep, arg) != 0)
	{
	    vim_free(*namep);
	    if (STRCMP(arg, "NONE") != 0)
		*namep = vim_strsave(arg);
	    else
		*namep = NULL;
	    did_change = TRUE;
	}
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    }
# endif

    return did_change;
}
#endif

/*
 * Set the start/stop terminal codes for a highlight group.
 * Returns TRUE if the terminal code is set.
 */
    static int
highlight_set_startstop_termcode(int idx, char_u *key, char_u *arg, int init)
{
    int		off;
    char_u	buf[100];
    int		len;
    char_u	*tname;
    char_u	*p;

    if (!init)
	HL_TABLE()[idx].sg_set |= SG_TERM;

    // The "start" and "stop"  arguments can be a literal escape
    // sequence, or a comma separated list of terminal codes.
    if (STRNCMP(arg, "t_", 2) == 0)
    {
	off = 0;
	buf[0] = 0;
	while (arg[off] != NUL)
	{
	    // Isolate one termcap name
	    for (len = 0; arg[off + len] &&
		    arg[off + len] != ','; ++len)
		;
	    tname = vim_strnsave(arg + off, len);
	    if (tname == NULL)		// out of memory
		return FALSE;
	    // lookup the escape sequence for the item
	    p = get_term_code(tname);
	    vim_free(tname);
	    if (p == NULL)	    // ignore non-existing things
		p = (char_u *)"";

	    // Append it to the already found stuff
	    if ((int)(STRLEN(buf) + STRLEN(p)) >= 99)
	    {
		semsg(_(e_terminal_code_too_long_str), arg);
		return FALSE;
	    }
	    STRCAT(buf, p);

	    // Advance to the next item
	    off += len;
	    if (arg[off] == ',')	    // another one follows
		++off;
	}
    }
    else
    {
	// Copy characters from arg[] to buf[], translating <> codes.
	for (p = arg, off = 0; off < 100 - 6 && *p; )
	{
	    len = trans_special(&p, buf + off, FSK_SIMPLIFY, FALSE, NULL);
	    if (len > 0)	    // recognized special char
		off += len;
	    else		    // copy as normal char
		buf[off++] = *p++;
	}
	buf[off] = NUL;
    }

    if (STRCMP(buf, "NONE") == 0)	// resetting the value
	p = NULL;
    else
	p = vim_strsave(buf);
    if (key[2] == 'A')
    {
	vim_free(HL_TABLE()[idx].sg_start);
	HL_TABLE()[idx].sg_start = p;
    }
    else
    {
	vim_free(HL_TABLE()[idx].sg_stop);
	HL_TABLE()[idx].sg_stop = p;
    }
    return TRUE;
}

/*
 * Handle the ":highlight .." command.
 * When using ":hi clear" this is called recursively for each group with
 * "forceit" and "init" both TRUE.
 */
    void
do_highlight(
    char_u	*line,
    int		forceit,
    int		init)	    // TRUE when called for initializing
{
    char_u	*name_end;
    char_u	*linep;
    char_u	*key_start;
    char_u	*arg_start;
    char_u	*key = NULL, *arg = NULL;
    long	i;
    int		id;
    int		idx;
    hl_group_T	item_before;
    int		did_change = FALSE;
    int		dodefault = FALSE;
    int		doclear = FALSE;
    int		dolink = FALSE;
    int		error = FALSE;
    int		is_normal_group = FALSE;	// "Normal" group
#ifdef FEAT_GUI_X11
    int		is_menu_group = FALSE;		// "Menu" group
    int		is_scrollbar_group = FALSE;	// "Scrollbar" group
    int		is_tooltip_group = FALSE;	// "Tooltip" group
#else
# define is_menu_group 0
# define is_tooltip_group 0
# define is_scrollbar_group 0
#endif
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
    int		do_colors = FALSE;		// need to update colors?
#endif
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    int		did_highlight_changed = FALSE;
#endif

    // If no argument, list current highlighting.
    if (!init && ends_excmd2(line - 1, line))
    {
	for (i = 1; i <= highlight_ga.ga_len && !got_int; ++i)
	    // TODO: only call when the group has attributes set
	    highlight_list_one((int)i);
	return;
    }

    // Isolate the name.
    name_end = skiptowhite(line);
    linep = skipwhite(name_end);

    // Check for "default" argument.
    if (STRNCMP(line, "default", name_end - line) == 0)
    {
	dodefault = TRUE;
	line = linep;
	name_end = skiptowhite(line);
	linep = skipwhite(name_end);
    }

    // Check for "clear" or "link" argument.
    if (STRNCMP(line, "clear", name_end - line) == 0)
	doclear = TRUE;
    if (STRNCMP(line, "link", name_end - line) == 0)
	dolink = TRUE;

    // ":highlight {group-name}": list highlighting for one group.
    if (!doclear && !dolink && ends_excmd2(line, linep))
    {
	id = syn_namen2id(line, (int)(name_end - line));
	if (id == 0)
	    semsg(_(e_highlight_group_name_not_found_str), line);
	else
	    highlight_list_one(id);
	return;
    }

    // Handle ":highlight link {from} {to}" command.
    if (dolink)
    {
	char_u	    *from_start = linep;
	char_u	    *from_end;
	int	    from_len;
	char_u	    *to_start;
	char_u	    *to_end;
	int	    to_len;

	from_end = skiptowhite(from_start);
	to_start = skipwhite(from_end);
	to_end	 = skiptowhite(to_start);

	if (ends_excmd2(line, from_start) || ends_excmd2(line, to_start))
	{
	    semsg(_(e_not_enough_arguments_highlight_link_str), from_start);
	    return;
	}

	if (!ends_excmd2(line, skipwhite(to_end)))
	{
	    semsg(_(e_too_many_arguments_highlight_link_str), from_start);
	    return;
	}

	from_len = (int)(from_end - from_start);
	to_len = (int)(to_end - to_start);
	highlight_group_link(from_start, from_len, to_start, to_len,
						dodefault, forceit, init);
	return;
    }

    if (doclear)
    {
	// ":highlight clear [group]" command.
	if (ends_excmd2(line, linep))
	{
	    // ":highlight clear" without group name
	    highlight_reset_all();
	    return;
	}
	line = linep;
	name_end = skiptowhite(line);
	linep = skipwhite(name_end);
    }

    // Find the group name in the table.  If it does not exist yet, add it.
    id = syn_check_group(line, (int)(name_end - line));
    if (id == 0)	// failed (out of memory)
	return;
    idx = id - 1;	// index is ID minus one

    // Return if "default" was used and the group already has settings.
    if (dodefault && hl_has_settings(idx, TRUE))
	return;

    // Make a copy so we can check if any attribute actually changed.
    item_before = HL_TABLE()[idx];

    if (STRCMP(HL_TABLE()[idx].sg_name_u, "NORMAL") == 0)
	is_normal_group = TRUE;
#ifdef FEAT_GUI_X11
    else if (STRCMP(HL_TABLE()[idx].sg_name_u, "MENU") == 0)
	is_menu_group = TRUE;
    else if (STRCMP(HL_TABLE()[idx].sg_name_u, "SCROLLBAR") == 0)
	is_scrollbar_group = TRUE;
    else if (STRCMP(HL_TABLE()[idx].sg_name_u, "TOOLTIP") == 0)
	is_tooltip_group = TRUE;
#endif

    // Clear the highlighting for ":hi clear {group}" and ":hi clear".
    if (doclear || (forceit && init))
    {
	highlight_clear(idx);
	if (!doclear)
	    HL_TABLE()[idx].sg_set = 0;
    }

    if (!doclear)
	while (!ends_excmd2(line, linep))
	{
	    key_start = linep;
	    if (*linep == '=')
	    {
		semsg(_(e_unexpected_equal_sign_str), key_start);
		error = TRUE;
		break;
	    }

	    // Isolate the key ("term", "ctermfg", "ctermbg", "font", "guifg"
	    // or "guibg").
	    while (*linep && !VIM_ISWHITE(*linep) && *linep != '=')
		++linep;
	    vim_free(key);
	    key = vim_strnsave_up(key_start, linep - key_start);
	    if (key == NULL)
	    {
		error = TRUE;
		break;
	    }
	    linep = skipwhite(linep);

	    if (STRCMP(key, "NONE") == 0)
	    {
		if (!init || HL_TABLE()[idx].sg_set == 0)
		{
		    if (!init)
			HL_TABLE()[idx].sg_set |= SG_TERM+SG_CTERM+SG_GUI;
		    highlight_clear(idx);
		}
		continue;
	    }

	    // Check for the equal sign.
	    if (*linep != '=')
	    {
		semsg(_(e_missing_equal_sign_str_2), key_start);
		error = TRUE;
		break;
	    }
	    ++linep;

	    // Isolate the argument.
	    linep = skipwhite(linep);
	    if (*linep == '\'')		// guifg='color name'
	    {
		arg_start = ++linep;
		linep = vim_strchr(linep, '\'');
		if (linep == NULL)
		{
		    semsg(_(e_invalid_argument_str), key_start);
		    error = TRUE;
		    break;
		}
	    }
	    else
	    {
		arg_start = linep;
		linep = skiptowhite(linep);
	    }
	    if (linep == arg_start)
	    {
		semsg(_(e_missing_argument_str), key_start);
		error = TRUE;
		break;
	    }
	    vim_free(arg);
	    arg = vim_strnsave(arg_start, linep - arg_start);
	    if (arg == NULL)
	    {
		error = TRUE;
		break;
	    }
	    if (*linep == '\'')
		++linep;

	    // Store the argument.
	    if (STRCMP(key, "TERM") == 0
		    || STRCMP(key, "CTERM") == 0
		    || STRCMP(key, "GUI") == 0)
	    {
		if (!highlight_set_termgui_attr(idx, key, arg, init))
		{
		    error = TRUE;
		    break;
		}
	    }
	    else if (STRCMP(key, "FONT") == 0)
	    {
		// in non-GUI fonts are simply ignored
#ifdef FEAT_GUI
		if (highlight_set_font(idx, arg, is_normal_group,
					      is_menu_group, is_tooltip_group))
		    did_change = TRUE;
#endif
	    }
	    else if (STRCMP(key, "CTERMFG") == 0
		    || STRCMP(key, "CTERMBG") == 0
		    || STRCMP(key, "CTERMUL") == 0)
	    {
		if (!highlight_set_cterm_color(idx, key, key_start, arg,
							is_normal_group, init))
		{
		    error = TRUE;
		    break;
		}
	    }
	    else if (STRCMP(key, "GUIFG") == 0)
	    {
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
		if (highlight_set_guifg(idx, arg, is_menu_group,
					  is_scrollbar_group, is_tooltip_group,
							     &do_colors, init))
		    did_change = TRUE;
#endif
	    }
	    else if (STRCMP(key, "GUIBG") == 0)
	    {
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
		if (highlight_set_guibg(idx, arg, is_menu_group,
			    is_scrollbar_group, is_tooltip_group,
			    &do_colors, init))
		    did_change = TRUE;
#endif
	    }
	    else if (STRCMP(key, "GUISP") == 0)
	    {
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
		if (highlight_set_guisp(idx, arg, init))
		    did_change = TRUE;
#endif
	    }
	    else if (STRCMP(key, "START") == 0 || STRCMP(key, "STOP") == 0)
	    {
		if (!highlight_set_startstop_termcode(idx, key, arg, init))
		{
		    error = TRUE;
		    break;
		}
	    }
	    else
	    {
		semsg(_(e_illegal_argument_str_3), key_start);
		error = TRUE;
		break;
	    }
	    HL_TABLE()[idx].sg_cleared = FALSE;

	    // When highlighting has been given for a group, don't link it.
	    if (!init || !(HL_TABLE()[idx].sg_set & SG_LINK))
		HL_TABLE()[idx].sg_link = 0;

	    // Continue with next argument.
	    linep = skipwhite(linep);
	}

    // If there is an error, and it's a new entry, remove it from the table.
    if (error && idx == highlight_ga.ga_len)
	syn_unadd_group();
    else
    {
	if (is_normal_group)
	{
	    HL_TABLE()[idx].sg_term_attr = 0;
	    HL_TABLE()[idx].sg_cterm_attr = 0;
#ifdef FEAT_GUI
	    HL_TABLE()[idx].sg_gui_attr = 0;
	    // Need to update all groups, because they might be using "bg"
	    // and/or "fg", which have been changed now.
#endif
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
	    if (USE_24BIT)
	    {
		highlight_gui_started();
		did_highlight_changed = TRUE;
		redraw_all_later(UPD_NOT_VALID);
	    }
#endif
#ifdef FEAT_VTP
	    control_console_color_rgb();
#endif
	}
#ifdef FEAT_GUI_X11
# ifdef FEAT_MENU
	else if (is_menu_group)
	{
	    if (gui.in_use && do_colors)
		gui_mch_new_menu_colors();
	}
# endif
	else if (is_scrollbar_group)
	{
	    if (gui.in_use && do_colors)
		gui_new_scrollbar_colors();
	    else
		set_hl_attr(idx);
	}
# ifdef FEAT_BEVAL_GUI
	else if (is_tooltip_group)
	{
	    if (gui.in_use && do_colors)
		gui_mch_new_tooltip_colors();
	}
# endif
#endif
	else
	    set_hl_attr(idx);
#ifdef FEAT_EVAL
	HL_TABLE()[idx].sg_script_ctx = current_sctx;
	HL_TABLE()[idx].sg_script_ctx.sc_lnum += SOURCING_LNUM;
#endif
    }

    vim_free(key);
    vim_free(arg);

    // Only call highlight_changed() once, after a sequence of highlight
    // commands, and only if an attribute actually changed.
    if ((did_change
	   || memcmp(&HL_TABLE()[idx], &item_before, sizeof(item_before)) != 0)
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
	    && !did_highlight_changed
#endif
       )
    {
	// Do not trigger a redraw when highlighting is changed while
	// redrawing.  This may happen when evaluating 'statusline' changes the
	// StatusLine group.
	if (!updating_screen)
	    redraw_all_later(UPD_NOT_VALID);
	need_highlight_changed = TRUE;
    }
}

#if defined(EXITFREE) || defined(PROTO)
    void
free_highlight(void)
{
    int	    i;

    for (i = 0; i < highlight_ga.ga_len; ++i)
    {
	highlight_clear(i);
	vim_free(HL_TABLE()[i].sg_name);
	vim_free(HL_TABLE()[i].sg_name_u);
    }
    ga_clear(&highlight_ga);
}
#endif

/*
 * Reset the cterm colors to what they were before Vim was started, if
 * possible.  Otherwise reset them to zero.
 */
    void
restore_cterm_colors(void)
{
#if defined(MSWIN) && !defined(FEAT_GUI_MSWIN)
    // Since t_me has been set, this probably means that the user
    // wants to use this as default colors.  Need to reset default
    // background/foreground colors.
    mch_set_normal_colors();
#else
# ifdef VIMDLL
    if (!gui.in_use)
    {
	mch_set_normal_colors();
	return;
    }
# endif
    cterm_normal_fg_color = 0;
    cterm_normal_fg_bold = 0;
    cterm_normal_bg_color = 0;
# ifdef FEAT_TERMGUICOLORS
    cterm_normal_fg_gui_color = INVALCOLOR;
    cterm_normal_bg_gui_color = INVALCOLOR;
    cterm_normal_ul_gui_color = INVALCOLOR;
# endif
#endif
}

/*
 * Return TRUE if highlight group "idx" has any settings.
 * When "check_link" is TRUE also check for an existing link.
 */
    static int
hl_has_settings(int idx, int check_link)
{
    return HL_TABLE()[idx].sg_cleared == 0
	 && (  HL_TABLE()[idx].sg_term_attr != 0
	    || HL_TABLE()[idx].sg_cterm_attr != 0
	    || HL_TABLE()[idx].sg_cterm_fg != 0
	    || HL_TABLE()[idx].sg_cterm_bg != 0
#ifdef FEAT_GUI
	    || HL_TABLE()[idx].sg_gui_attr != 0
	    || HL_TABLE()[idx].sg_gui_fg_name != NULL
	    || HL_TABLE()[idx].sg_gui_bg_name != NULL
	    || HL_TABLE()[idx].sg_gui_sp_name != NULL
	    || HL_TABLE()[idx].sg_font_name != NULL
#endif
	    || (check_link && (HL_TABLE()[idx].sg_set & SG_LINK)));
}

/*
 * Clear highlighting for one group.
 */
    static void
highlight_clear(int idx)
{
    HL_TABLE()[idx].sg_cleared = TRUE;

    HL_TABLE()[idx].sg_term = 0;
    VIM_CLEAR(HL_TABLE()[idx].sg_start);
    VIM_CLEAR(HL_TABLE()[idx].sg_stop);
    HL_TABLE()[idx].sg_term_attr = 0;
    HL_TABLE()[idx].sg_cterm = 0;
    HL_TABLE()[idx].sg_cterm_bold = FALSE;
    HL_TABLE()[idx].sg_cterm_fg = 0;
    HL_TABLE()[idx].sg_cterm_bg = 0;
    HL_TABLE()[idx].sg_cterm_attr = 0;
#if defined(FEAT_GUI) || defined(FEAT_EVAL)
    HL_TABLE()[idx].sg_gui = 0;
    VIM_CLEAR(HL_TABLE()[idx].sg_gui_fg_name);
    VIM_CLEAR(HL_TABLE()[idx].sg_gui_bg_name);
    VIM_CLEAR(HL_TABLE()[idx].sg_gui_sp_name);
#endif
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    HL_TABLE()[idx].sg_gui_fg = INVALCOLOR;
    HL_TABLE()[idx].sg_gui_bg = INVALCOLOR;
    HL_TABLE()[idx].sg_gui_sp = INVALCOLOR;
#endif
#ifdef FEAT_GUI
    gui_mch_free_font(HL_TABLE()[idx].sg_font);
    HL_TABLE()[idx].sg_font = NOFONT;
# ifdef FEAT_XFONTSET
    gui_mch_free_fontset(HL_TABLE()[idx].sg_fontset);
    HL_TABLE()[idx].sg_fontset = NOFONTSET;
# endif
    VIM_CLEAR(HL_TABLE()[idx].sg_font_name);
    HL_TABLE()[idx].sg_gui_attr = 0;
#endif
    // Restore default link and context if they exist. Otherwise clears.
    HL_TABLE()[idx].sg_link = HL_TABLE()[idx].sg_deflink;
#ifdef FEAT_EVAL
    // Since we set the default link, set the location to where the default
    // link was set.
    HL_TABLE()[idx].sg_script_ctx = HL_TABLE()[idx].sg_deflink_sctx;
#endif
}

#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
/*
 * Set the normal foreground and background colors according to the "Normal"
 * highlighting group.  For X11 also set "Menu", "Scrollbar", and
 * "Tooltip" colors.
 */
    void
set_normal_colors(void)
{
# ifdef FEAT_GUI
#  ifdef FEAT_TERMGUICOLORS
    if (gui.in_use)
#  endif
    {
	if (set_group_colors((char_u *)"Normal",
				 &gui.norm_pixel, &gui.back_pixel,
				 FALSE, TRUE, FALSE))
	{
	    gui_mch_new_colors();
	    set_must_redraw(UPD_CLEAR);
	}
#  ifdef FEAT_GUI_X11
	if (set_group_colors((char_u *)"Menu",
			     &gui.menu_fg_pixel, &gui.menu_bg_pixel,
			     TRUE, FALSE, FALSE))
	{
#   ifdef FEAT_MENU
	    gui_mch_new_menu_colors();
#   endif
	    set_must_redraw(UPD_CLEAR);
	}
#   ifdef FEAT_BEVAL_GUI
	if (set_group_colors((char_u *)"Tooltip",
			     &gui.tooltip_fg_pixel, &gui.tooltip_bg_pixel,
			     FALSE, FALSE, TRUE))
	{
#    ifdef FEAT_TOOLBAR
	    gui_mch_new_tooltip_colors();
#    endif
	    set_must_redraw(UPD_CLEAR);
	}
#   endif
	if (set_group_colors((char_u *)"Scrollbar",
			&gui.scroll_fg_pixel, &gui.scroll_bg_pixel,
			FALSE, FALSE, FALSE))
	{
	    gui_new_scrollbar_colors();
	    set_must_redraw(UPD_CLEAR);
	}
#  endif
    }
# endif
# ifdef FEAT_TERMGUICOLORS
#  ifdef FEAT_GUI
    else
#  endif
    {
	int		idx;

	idx = syn_name2id((char_u *)"Normal") - 1;
	if (idx >= 0)
	{
	    gui_do_one_color(idx, FALSE, FALSE);

	    // If the normal fg or bg color changed a complete redraw is
	    // required.
	    if (cterm_normal_fg_gui_color != HL_TABLE()[idx].sg_gui_fg
		    || cterm_normal_bg_gui_color != HL_TABLE()[idx].sg_gui_bg)
	    {
		// if the GUI color is INVALCOLOR then we use the default cterm
		// color
		cterm_normal_fg_gui_color = HL_TABLE()[idx].sg_gui_fg;
		cterm_normal_bg_gui_color = HL_TABLE()[idx].sg_gui_bg;
		set_must_redraw(UPD_CLEAR);
	    }
	}
    }
# endif
}
#endif

#if defined(FEAT_GUI) || defined(PROTO)
/*
 * Set the colors for "Normal", "Menu", "Tooltip" or "Scrollbar".
 */
    static int
set_group_colors(
    char_u	*name,
    guicolor_T	*fgp,
    guicolor_T	*bgp,
    int		do_menu,
    int		use_norm,
    int		do_tooltip)
{
    int		idx;

    idx = syn_name2id(name) - 1;
    if (idx < 0)
	return FALSE;

    gui_do_one_color(idx, do_menu, do_tooltip);

    if (HL_TABLE()[idx].sg_gui_fg != INVALCOLOR)
	*fgp = HL_TABLE()[idx].sg_gui_fg;
    else if (use_norm)
	*fgp = gui.def_norm_pixel;
    if (HL_TABLE()[idx].sg_gui_bg != INVALCOLOR)
	*bgp = HL_TABLE()[idx].sg_gui_bg;
    else if (use_norm)
	*bgp = gui.def_back_pixel;
    return TRUE;
}

/*
 * Get the font of the "Normal" group.
 * Returns "" when it's not found or not set.
 */
    char_u *
hl_get_font_name(void)
{
    int		id;
    char_u	*s;

    id = syn_name2id((char_u *)"Normal");
    if (id > 0)
    {
	s = HL_TABLE()[id - 1].sg_font_name;
	if (s != NULL)
	    return s;
    }
    return (char_u *)"";
}

/*
 * Set font for "Normal" group.  Called by gui_mch_init_font() when a font has
 * actually chosen to be used.
 */
    void
hl_set_font_name(char_u *font_name)
{
    int	    id;

    id = syn_name2id((char_u *)"Normal");
    if (id <= 0)
	return;

    vim_free(HL_TABLE()[id - 1].sg_font_name);
    HL_TABLE()[id - 1].sg_font_name = vim_strsave(font_name);
}

/*
 * Set background color for "Normal" group.  Called by gui_set_bg_color()
 * when the color is known.
 */
    void
hl_set_bg_color_name(
    char_u  *name)	    // must have been allocated
{
    int	    id;

    if (name == NULL)
	return;

    id = syn_name2id((char_u *)"Normal");
    if (id <= 0)
	return;

    vim_free(HL_TABLE()[id - 1].sg_gui_bg_name);
    HL_TABLE()[id - 1].sg_gui_bg_name = name;
}

/*
 * Set foreground color for "Normal" group.  Called by gui_set_fg_color()
 * when the color is known.
 */
    void
hl_set_fg_color_name(
    char_u  *name)	    // must have been allocated
{
    int	    id;

    if (name == NULL)
	return;

    id = syn_name2id((char_u *)"Normal");
    if (id <= 0)
	return;

    vim_free(HL_TABLE()[id - 1].sg_gui_fg_name);
    HL_TABLE()[id - 1].sg_gui_fg_name = name;
}

/*
 * Return the handle for a font name.
 * Returns NOFONT when failed.
 */
    static GuiFont
font_name2handle(char_u *name)
{
    if (STRCMP(name, "NONE") == 0)
	return NOFONT;

    return gui_mch_get_font(name, TRUE);
}

# ifdef FEAT_XFONTSET
/*
 * Return the handle for a fontset name.
 * Returns NOFONTSET when failed.
 */
    static GuiFontset
fontset_name2handle(char_u *name, int fixed_width)
{
    if (STRCMP(name, "NONE") == 0)
	return NOFONTSET;

    return gui_mch_get_fontset(name, TRUE, fixed_width);
}
# endif

/*
 * Get the font or fontset for one highlight group.
 */
    static void
hl_do_font(
    int		idx,
    char_u	*arg,
    int		do_normal,		// set normal font
    int		do_menu UNUSED,		// set menu font
    int		do_tooltip UNUSED,	// set tooltip font
    int		free_font)		// free current font/fontset
{
# ifdef FEAT_XFONTSET
    // If 'guifontset' is not empty, first try using the name as a
    // fontset.  If that doesn't work, use it as a font name.
    if (*p_guifontset != NUL
#  ifdef FONTSET_ALWAYS
	|| do_menu
#  endif
#  ifdef FEAT_BEVAL_TIP
	// In Motif, the Tooltip highlight group is always a fontset
	|| do_tooltip
#  endif
	    )
    {
	if (free_font)
	    gui_mch_free_fontset(HL_TABLE()[idx].sg_fontset);
	HL_TABLE()[idx].sg_fontset = fontset_name2handle(arg, 0
#  ifdef FONTSET_ALWAYS
		|| do_menu
#  endif
#  ifdef FEAT_BEVAL_TIP
		|| do_tooltip
#  endif
		);
    }
    if (HL_TABLE()[idx].sg_fontset != NOFONTSET)
    {
	// If it worked and it's the Normal group, use it as the normal
	// fontset.  Same for the Menu group.
	if (do_normal)
	    gui_init_font(arg, TRUE);
#   if defined(FEAT_GUI_MOTIF) && defined(FEAT_MENU)
	if (do_menu)
	{
#    ifdef FONTSET_ALWAYS
	    gui.menu_fontset = HL_TABLE()[idx].sg_fontset;
#    else
	    // YIKES!  This is a bug waiting to crash the program
	    gui.menu_font = HL_TABLE()[idx].sg_fontset;
#    endif
	    gui_mch_new_menu_font();
	}
#    ifdef FEAT_BEVAL_GUI
	if (do_tooltip)
	{
	    // The Athena widget set could not handle switching between
	    // displaying a single font and a fontset.
	    // If the XtNinternational resource is set to True at widget
	    // creation, then a fontset is always used, otherwise an
	    // XFontStruct is used.
	    gui.tooltip_fontset = (XFontSet)HL_TABLE()[idx].sg_fontset;
	    gui_mch_new_tooltip_font();
	}
#    endif
#   endif
    }
    else
# endif
    {
	if (free_font)
	    gui_mch_free_font(HL_TABLE()[idx].sg_font);
	HL_TABLE()[idx].sg_font = font_name2handle(arg);
	// If it worked and it's the Normal group, use it as the
	// normal font.  Same for the Menu group.
	if (HL_TABLE()[idx].sg_font != NOFONT)
	{
	    if (do_normal)
		gui_init_font(arg, FALSE);
#ifndef FONTSET_ALWAYS
# if defined(FEAT_GUI_MOTIF) && defined(FEAT_MENU)
	    if (do_menu)
	    {
		gui.menu_font = HL_TABLE()[idx].sg_font;
		gui_mch_new_menu_font();
	    }
# endif
#endif
	}
    }
}

#endif // FEAT_GUI

#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
/*
 * Return the handle for a color name.
 * Returns INVALCOLOR when failed.
 */
    guicolor_T
color_name2handle(char_u *name)
{
    if (STRCMP(name, "NONE") == 0)
	return INVALCOLOR;

    if (STRICMP(name, "fg") == 0 || STRICMP(name, "foreground") == 0)
    {
#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
	if (gui.in_use)
#endif
#ifdef FEAT_GUI
	    return gui.norm_pixel;
#endif
#ifdef FEAT_TERMGUICOLORS
	if (cterm_normal_fg_gui_color != INVALCOLOR)
	    return cterm_normal_fg_gui_color;
	// Guess that the foreground is black or white.
	return GUI_GET_COLOR((char_u *)(*p_bg == 'l' ? "black" : "white"));
#endif
    }
    if (STRICMP(name, "bg") == 0 || STRICMP(name, "background") == 0)
    {
#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
	if (gui.in_use)
#endif
#ifdef FEAT_GUI
	    return gui.back_pixel;
#endif
#ifdef FEAT_TERMGUICOLORS
	if (cterm_normal_bg_gui_color != INVALCOLOR)
	    return cterm_normal_bg_gui_color;
	// Guess that the background is white or black.
	return GUI_GET_COLOR((char_u *)(*p_bg == 'l' ? "white" : "black"));
#endif
    }

    return GUI_GET_COLOR(name);
}

// On MS-Windows an RGB macro is available and it produces 0x00bbggrr color
// values as used by the MS-Windows GDI api.  It should be used only for
// MS-Windows GDI builds.
# if defined(RGB) && defined(MSWIN) && !defined(FEAT_GUI)
#  undef RGB
# endif
# ifndef RGB
#  define RGB(r, g, b)	(((r)<<16) | ((g)<<8) | (b))
# endif

# ifdef VIMDLL
    static guicolor_T
gui_adjust_rgb(guicolor_T c)
{
    if (gui.in_use)
	return c;
    else
	return ((c & 0xff) << 16) | (c & 0x00ff00) | ((c >> 16) & 0xff);
}
# else
#  define gui_adjust_rgb(c) (c)
# endif

    static int
hex_digit(int c)
{
    if (isdigit(c))
	return c - '0';
    c = TOLOWER_ASC(c);
    if (c >= 'a' && c <= 'f')
	return c - 'a' + 10;
    return 0x1ffffff;
}

    static guicolor_T
decode_hex_color(char_u *hex)
{
    guicolor_T color;

    if (hex[0] != '#' || STRLEN(hex) != 7)
	return INVALCOLOR;

    // Name is in "#rrggbb" format
    color = RGB(((hex_digit(hex[1]) << 4) + hex_digit(hex[2])),
		((hex_digit(hex[3]) << 4) + hex_digit(hex[4])),
		((hex_digit(hex[5]) << 4) + hex_digit(hex[6])));
    if (color > 0xffffff)
	return INVALCOLOR;
    return gui_adjust_rgb(color);
}

#ifdef FEAT_EVAL
// Returns the color currently mapped to the given name or INVALCOLOR if no
// such name exists in the color table. The convention is to use lowercase for
// all keys in the v:colornames dictionary. The value can be either a string in
// the form #rrggbb or a number, either of which is converted to a guicolor_T.
    static guicolor_T
colorname2rgb(char_u *name)
{
    dict_T      *colornames_table = get_vim_var_dict(VV_COLORNAMES);
    char_u      *lc_name;
    dictitem_T  *colentry;
    char_u      *colstr;
    varnumber_T colnum;

    lc_name = strlow_save(name);
    if (lc_name == NULL)
	return INVALCOLOR;

    colentry = dict_find(colornames_table, lc_name, -1);
    vim_free(lc_name);
    if (colentry == NULL)
	return INVALCOLOR;

    if (colentry->di_tv.v_type == VAR_STRING)
    {
	colstr = tv_get_string_strict(&colentry->di_tv);
	if ((STRLEN(colstr) == 7) && (*colstr == '#'))
	{
	    return decode_hex_color(colstr);
	}
	else
	{
	    semsg(_(e_bad_color_string_str), colstr);
	    return INVALCOLOR;
	}
    }

    if (colentry->di_tv.v_type == VAR_NUMBER)
    {
	colnum = tv_get_number(&colentry->di_tv);
	return (guicolor_T)colnum;
    }

    return INVALCOLOR;
}

#endif

    guicolor_T
gui_get_color_cmn(char_u *name)
{
    int		i;
    guicolor_T  color;

    struct rgbcolor_table_S {
	char_u	    *color_name;
	guicolor_T  color;
    };

    // Only non X11 colors (not present in rgb.txt) and colors in
    // color_names[], useful when $VIMRUNTIME is not found,.
    static struct rgbcolor_table_S rgb_table[] = {
	    {(char_u *)"black",		RGB(0x00, 0x00, 0x00)},
	    {(char_u *)"blue",		RGB(0x00, 0x00, 0xFF)},
	    {(char_u *)"brown",		RGB(0xA5, 0x2A, 0x2A)},
	    {(char_u *)"cyan",		RGB(0x00, 0xFF, 0xFF)},
	    {(char_u *)"darkblue",	RGB(0x00, 0x00, 0x8B)},
	    {(char_u *)"darkcyan",	RGB(0x00, 0x8B, 0x8B)},
	    {(char_u *)"darkgray",	RGB(0xA9, 0xA9, 0xA9)},
	    {(char_u *)"darkgreen",	RGB(0x00, 0x64, 0x00)},
	    {(char_u *)"darkgrey",	RGB(0xA9, 0xA9, 0xA9)},
	    {(char_u *)"darkmagenta",	RGB(0x8B, 0x00, 0x8B)},
	    {(char_u *)"darkred",	RGB(0x8B, 0x00, 0x00)},
	    {(char_u *)"darkyellow",	RGB(0x8B, 0x8B, 0x00)}, // No X11
	    {(char_u *)"gray",		RGB(0xBE, 0xBE, 0xBE)},
	    {(char_u *)"green",		RGB(0x00, 0xFF, 0x00)},
	    {(char_u *)"grey",		RGB(0xBE, 0xBE, 0xBE)},
	    {(char_u *)"grey40",	RGB(0x66, 0x66, 0x66)},
	    {(char_u *)"grey50",	RGB(0x7F, 0x7F, 0x7F)},
	    {(char_u *)"grey90",	RGB(0xE5, 0xE5, 0xE5)},
	    {(char_u *)"lightblue",	RGB(0xAD, 0xD8, 0xE6)},
	    {(char_u *)"lightcyan",	RGB(0xE0, 0xFF, 0xFF)},
	    {(char_u *)"lightgray",	RGB(0xD3, 0xD3, 0xD3)},
	    {(char_u *)"lightgreen",	RGB(0x90, 0xEE, 0x90)},
	    {(char_u *)"lightgrey",	RGB(0xD3, 0xD3, 0xD3)},
	    {(char_u *)"lightmagenta",	RGB(0xFF, 0x8B, 0xFF)}, // No X11
	    {(char_u *)"lightred",	RGB(0xFF, 0x8B, 0x8B)}, // No X11
	    {(char_u *)"lightyellow",	RGB(0xFF, 0xFF, 0xE0)},
	    {(char_u *)"magenta",	RGB(0xFF, 0x00, 0xFF)},
	    {(char_u *)"red",		RGB(0xFF, 0x00, 0x00)},
	    {(char_u *)"seagreen",	RGB(0x2E, 0x8B, 0x57)},
	    {(char_u *)"white",		RGB(0xFF, 0xFF, 0xFF)},
	    {(char_u *)"yellow",	RGB(0xFF, 0xFF, 0x00)},
    };

    color = decode_hex_color(name);
    if (color != INVALCOLOR)
	return color;

    // Check if the name is one of the colors we know
    for (i = 0; i < (int)ARRAY_LENGTH(rgb_table); i++)
	if (STRICMP(name, rgb_table[i].color_name) == 0)
	    return gui_adjust_rgb(rgb_table[i].color);

#if defined(FEAT_EVAL)
    /*
     * Not a traditional color. Load additional color aliases and then consult the alias table.
     */

    color = colorname2rgb(name);
    if (color == INVALCOLOR)
    {
	load_default_colors_lists();
	color = colorname2rgb(name);
    }

    return color;
#else
    return INVALCOLOR;
#endif
}

    guicolor_T
gui_get_rgb_color_cmn(int r, int g, int b)
{
    guicolor_T  color = RGB(r, g, b);

    if (color > 0xffffff)
	return INVALCOLOR;
    return gui_adjust_rgb(color);
}
#endif

/*
 * Table with the specifications for an attribute number.
 * Note that this table is used by ALL buffers.  This is required because the
 * GUI can redraw at any time for any buffer.
 */
static garray_T	term_attr_table = {0, 0, 0, 0, NULL};

#define TERM_ATTR_ENTRY(idx) ((attrentry_T *)term_attr_table.ga_data)[idx]

static garray_T	cterm_attr_table = {0, 0, 0, 0, NULL};

#define CTERM_ATTR_ENTRY(idx) ((attrentry_T *)cterm_attr_table.ga_data)[idx]

#ifdef FEAT_GUI
static garray_T	gui_attr_table = {0, 0, 0, 0, NULL};

#define GUI_ATTR_ENTRY(idx) ((attrentry_T *)gui_attr_table.ga_data)[idx]
#endif

/*
 * Return the attr number for a set of colors and font.
 * Add a new entry to the term_attr_table, cterm_attr_table or gui_attr_table
 * if the combination is new.
 * Return 0 for error (no more room).
 */
    static int
get_attr_entry(garray_T *table, attrentry_T *aep)
{
    int		i;
    attrentry_T	*taep;
    static int	recursive = FALSE;

    // Init the table, in case it wasn't done yet.
    table->ga_itemsize = sizeof(attrentry_T);
    table->ga_growsize = 7;

    // Try to find an entry with the same specifications.
    for (i = 0; i < table->ga_len; ++i)
    {
	taep = &(((attrentry_T *)table->ga_data)[i]);
	if (	   aep->ae_attr == taep->ae_attr
		&& (
#ifdef FEAT_GUI
		       (table == &gui_attr_table
			&& (aep->ae_u.gui.fg_color == taep->ae_u.gui.fg_color
			    && aep->ae_u.gui.bg_color
						    == taep->ae_u.gui.bg_color
			    && aep->ae_u.gui.sp_color
						    == taep->ae_u.gui.sp_color
			    && aep->ae_u.gui.font == taep->ae_u.gui.font
#  ifdef FEAT_XFONTSET
			    && aep->ae_u.gui.fontset == taep->ae_u.gui.fontset
#  endif
			    ))
		    ||
#endif
		       (table == &term_attr_table
			&& (aep->ae_u.term.start == NULL)
					    == (taep->ae_u.term.start == NULL)
			&& (aep->ae_u.term.start == NULL
			    || STRCMP(aep->ae_u.term.start,
						  taep->ae_u.term.start) == 0)
			&& (aep->ae_u.term.stop == NULL)
					     == (taep->ae_u.term.stop == NULL)
			&& (aep->ae_u.term.stop == NULL
			    || STRCMP(aep->ae_u.term.stop,
						  taep->ae_u.term.stop) == 0))
		    || (table == &cterm_attr_table
			    && aep->ae_u.cterm.fg_color
						  == taep->ae_u.cterm.fg_color
			    && aep->ae_u.cterm.bg_color
						  == taep->ae_u.cterm.bg_color
			    && aep->ae_u.cterm.ul_color
						  == taep->ae_u.cterm.ul_color
#ifdef FEAT_TERMGUICOLORS
			    && aep->ae_u.cterm.fg_rgb
						    == taep->ae_u.cterm.fg_rgb
			    && aep->ae_u.cterm.bg_rgb
						    == taep->ae_u.cterm.bg_rgb
			    && aep->ae_u.cterm.ul_rgb
						    == taep->ae_u.cterm.ul_rgb
#endif
		       )))

	return i + ATTR_OFF;
    }

    if (table->ga_len + ATTR_OFF > MAX_TYPENR)
    {
	// Running out of attribute entries!  remove all attributes, and
	// compute new ones for all groups.
	// When called recursively, we are really out of numbers.
	if (recursive)
	{
	    emsg(_(e_too_many_different_highlighting_attributes_in_use));
	    return 0;
	}
	recursive = TRUE;

	clear_hl_tables();

	set_must_redraw(UPD_CLEAR);

	for (i = 0; i < highlight_ga.ga_len; ++i)
	    set_hl_attr(i);

	recursive = FALSE;
    }

    // This is a new combination of colors and font, add an entry.
    if (ga_grow(table, 1) == FAIL)
	return 0;

    taep = &(((attrentry_T *)table->ga_data)[table->ga_len]);
    CLEAR_POINTER(taep);
    taep->ae_attr = aep->ae_attr;
#ifdef FEAT_GUI
    if (table == &gui_attr_table)
    {
	taep->ae_u.gui.fg_color = aep->ae_u.gui.fg_color;
	taep->ae_u.gui.bg_color = aep->ae_u.gui.bg_color;
	taep->ae_u.gui.sp_color = aep->ae_u.gui.sp_color;
	taep->ae_u.gui.font = aep->ae_u.gui.font;
# ifdef FEAT_XFONTSET
	taep->ae_u.gui.fontset = aep->ae_u.gui.fontset;
# endif
    }
#endif
    if (table == &term_attr_table)
    {
	if (aep->ae_u.term.start == NULL)
	    taep->ae_u.term.start = NULL;
	else
	    taep->ae_u.term.start = vim_strsave(aep->ae_u.term.start);
	if (aep->ae_u.term.stop == NULL)
	    taep->ae_u.term.stop = NULL;
	else
	    taep->ae_u.term.stop = vim_strsave(aep->ae_u.term.stop);
    }
    else if (table == &cterm_attr_table)
    {
	taep->ae_u.cterm.fg_color = aep->ae_u.cterm.fg_color;
	taep->ae_u.cterm.bg_color = aep->ae_u.cterm.bg_color;
	taep->ae_u.cterm.ul_color = aep->ae_u.cterm.ul_color;
#ifdef FEAT_TERMGUICOLORS
	taep->ae_u.cterm.fg_rgb = aep->ae_u.cterm.fg_rgb;
	taep->ae_u.cterm.bg_rgb = aep->ae_u.cterm.bg_rgb;
	taep->ae_u.cterm.ul_rgb = aep->ae_u.cterm.ul_rgb;
#endif
    }
    ++table->ga_len;
    return (table->ga_len - 1 + ATTR_OFF);
}

#if defined(FEAT_TERMINAL) || defined(PROTO)
/*
 * Get an attribute index for a cterm entry.
 * Uses an existing entry when possible or adds one when needed.
 */
    int
get_cterm_attr_idx(int attr, int fg, int bg)
{
    attrentry_T		at_en;

    CLEAR_FIELD(at_en);
#ifdef FEAT_TERMGUICOLORS
    at_en.ae_u.cterm.fg_rgb = INVALCOLOR;
    at_en.ae_u.cterm.bg_rgb = INVALCOLOR;
    at_en.ae_u.cterm.ul_rgb = INVALCOLOR;
#endif
    at_en.ae_attr = attr;
    at_en.ae_u.cterm.fg_color = fg;
    at_en.ae_u.cterm.bg_color = bg;
    at_en.ae_u.cterm.ul_color = 0;
    return get_attr_entry(&cterm_attr_table, &at_en);
}
#endif

#if (defined(FEAT_TERMINAL) && defined(FEAT_TERMGUICOLORS)) || defined(PROTO)
/*
 * Get an attribute index for a 'termguicolors' entry.
 * Uses an existing entry when possible or adds one when needed.
 */
    int
get_tgc_attr_idx(int attr, guicolor_T fg, guicolor_T bg)
{
    attrentry_T		at_en;

    CLEAR_FIELD(at_en);
    at_en.ae_attr = attr;
    if (fg == INVALCOLOR && bg == INVALCOLOR)
    {
	// If both GUI colors are not set fall back to the cterm colors.  Helps
	// if the GUI only has an attribute, such as undercurl.
	at_en.ae_u.cterm.fg_rgb = CTERMCOLOR;
	at_en.ae_u.cterm.bg_rgb = CTERMCOLOR;
    }
    else
    {
	at_en.ae_u.cterm.fg_rgb = fg;
	at_en.ae_u.cterm.bg_rgb = bg;
    }
    at_en.ae_u.cterm.ul_rgb = INVALCOLOR;
    return get_attr_entry(&cterm_attr_table, &at_en);
}
#endif

#if (defined(FEAT_TERMINAL) && defined(FEAT_GUI)) || defined(PROTO)
/*
 * Get an attribute index for a cterm entry.
 * Uses an existing entry when possible or adds one when needed.
 */
    int
get_gui_attr_idx(int attr, guicolor_T fg, guicolor_T bg)
{
    attrentry_T		at_en;

    CLEAR_FIELD(at_en);
    at_en.ae_attr = attr;
    at_en.ae_u.gui.fg_color = fg;
    at_en.ae_u.gui.bg_color = bg;
    return get_attr_entry(&gui_attr_table, &at_en);
}
#endif

/*
 * Clear all highlight tables.
 */
    void
clear_hl_tables(void)
{
    int		i;
    attrentry_T	*taep;

#ifdef FEAT_GUI
    ga_clear(&gui_attr_table);
#endif
    for (i = 0; i < term_attr_table.ga_len; ++i)
    {
	taep = &(((attrentry_T *)term_attr_table.ga_data)[i]);
	vim_free(taep->ae_u.term.start);
	vim_free(taep->ae_u.term.stop);
    }
    ga_clear(&term_attr_table);
    ga_clear(&cterm_attr_table);
}

/*
 * Combine special attributes (e.g., for spelling) with other attributes
 * (e.g., for syntax highlighting).
 * "prim_attr" overrules "char_attr".
 * This creates a new group when required.
 * Since we expect there to be few spelling mistakes we don't cache the
 * result.
 * Return the resulting attributes.
 */
    int
hl_combine_attr(int char_attr, int prim_attr)
{
    attrentry_T *char_aep = NULL;
    attrentry_T *prim_aep;
    attrentry_T new_en;

    if (char_attr == 0)
	return prim_attr;
    if (char_attr <= HL_ALL && prim_attr <= HL_ALL)
	return ATTR_COMBINE(char_attr, prim_attr);
#ifdef FEAT_GUI
    if (gui.in_use)
    {
	if (char_attr > HL_ALL)
	    char_aep = syn_gui_attr2entry(char_attr);
	if (char_aep != NULL)
	    new_en = *char_aep;
	else
	{
	    CLEAR_FIELD(new_en);
	    new_en.ae_u.gui.fg_color = INVALCOLOR;
	    new_en.ae_u.gui.bg_color = INVALCOLOR;
	    new_en.ae_u.gui.sp_color = INVALCOLOR;
	    if (char_attr <= HL_ALL)
		new_en.ae_attr = char_attr;
	}

	if (prim_attr <= HL_ALL)
	    new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr, prim_attr);
	else
	{
	    prim_aep = syn_gui_attr2entry(prim_attr);
	    if (prim_aep != NULL)
	    {
		new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr,
							   prim_aep->ae_attr);
		if (prim_aep->ae_u.gui.fg_color != INVALCOLOR)
		    new_en.ae_u.gui.fg_color = prim_aep->ae_u.gui.fg_color;
		if (prim_aep->ae_u.gui.bg_color != INVALCOLOR)
		    new_en.ae_u.gui.bg_color = prim_aep->ae_u.gui.bg_color;
		if (prim_aep->ae_u.gui.sp_color != INVALCOLOR)
		    new_en.ae_u.gui.sp_color = prim_aep->ae_u.gui.sp_color;
		if (prim_aep->ae_u.gui.font != NOFONT)
		    new_en.ae_u.gui.font = prim_aep->ae_u.gui.font;
# ifdef FEAT_XFONTSET
		if (prim_aep->ae_u.gui.fontset != NOFONTSET)
		    new_en.ae_u.gui.fontset = prim_aep->ae_u.gui.fontset;
# endif
	    }
	}
	return get_attr_entry(&gui_attr_table, &new_en);
    }
#endif

    if (IS_CTERM)
    {
	if (char_attr > HL_ALL)
	    char_aep = syn_cterm_attr2entry(char_attr);
	if (char_aep != NULL)
	    new_en = *char_aep;
	else
	{
	    CLEAR_FIELD(new_en);
#ifdef FEAT_TERMGUICOLORS
	    new_en.ae_u.cterm.bg_rgb = INVALCOLOR;
	    new_en.ae_u.cterm.fg_rgb = INVALCOLOR;
	    new_en.ae_u.cterm.ul_rgb = INVALCOLOR;
#endif
	    if (char_attr <= HL_ALL)
		new_en.ae_attr = char_attr;
	}

	if (prim_attr <= HL_ALL)
		new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr, prim_attr);
	else
	{
	    prim_aep = syn_cterm_attr2entry(prim_attr);
	    if (prim_aep != NULL)
	    {
		new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr,
							   prim_aep->ae_attr);
		if (prim_aep->ae_u.cterm.fg_color > 0)
		    new_en.ae_u.cterm.fg_color = prim_aep->ae_u.cterm.fg_color;
		if (prim_aep->ae_u.cterm.bg_color > 0)
		    new_en.ae_u.cterm.bg_color = prim_aep->ae_u.cterm.bg_color;
		if (prim_aep->ae_u.cterm.ul_color > 0)
		    new_en.ae_u.cterm.ul_color = prim_aep->ae_u.cterm.ul_color;
#ifdef FEAT_TERMGUICOLORS
		// If both fg and bg are not set fall back to cterm colors.
		// Helps for SpellBad which uses undercurl in the GUI.
		if (COLOR_INVALID(prim_aep->ae_u.cterm.fg_rgb)
			&& COLOR_INVALID(prim_aep->ae_u.cterm.bg_rgb))
		{
		    if (prim_aep->ae_u.cterm.fg_color > 0)
			new_en.ae_u.cterm.fg_rgb = CTERMCOLOR;
		    if (prim_aep->ae_u.cterm.bg_color > 0)
			new_en.ae_u.cterm.bg_rgb = CTERMCOLOR;
		}
		else
		{
		    if (prim_aep->ae_u.cterm.fg_rgb != INVALCOLOR)
			new_en.ae_u.cterm.fg_rgb = prim_aep->ae_u.cterm.fg_rgb;
		    if (prim_aep->ae_u.cterm.bg_rgb != INVALCOLOR)
			new_en.ae_u.cterm.bg_rgb = prim_aep->ae_u.cterm.bg_rgb;
		}
		if (prim_aep->ae_u.cterm.ul_rgb != INVALCOLOR)
		    new_en.ae_u.cterm.ul_rgb = prim_aep->ae_u.cterm.ul_rgb;
#endif
	    }
	}
	return get_attr_entry(&cterm_attr_table, &new_en);
    }

    if (char_attr > HL_ALL)
	char_aep = syn_term_attr2entry(char_attr);
    if (char_aep != NULL)
	new_en = *char_aep;
    else
    {
	CLEAR_FIELD(new_en);
	if (char_attr <= HL_ALL)
	    new_en.ae_attr = char_attr;
    }

    if (prim_attr <= HL_ALL)
	new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr, prim_attr);
    else
    {
	prim_aep = syn_term_attr2entry(prim_attr);
	if (prim_aep != NULL)
	{
	    new_en.ae_attr = ATTR_COMBINE(new_en.ae_attr, prim_aep->ae_attr);
	    if (prim_aep->ae_u.term.start != NULL)
	    {
		new_en.ae_u.term.start = prim_aep->ae_u.term.start;
		new_en.ae_u.term.stop = prim_aep->ae_u.term.stop;
	    }
	}
    }
    return get_attr_entry(&term_attr_table, &new_en);
}

#ifdef FEAT_GUI
    attrentry_T *
syn_gui_attr2entry(int attr)
{
    attr -= ATTR_OFF;
    if (attr >= gui_attr_table.ga_len)	    // did ":syntax clear"
	return NULL;
    return &(GUI_ATTR_ENTRY(attr));
}
#endif

/*
 * Get the highlight attributes (HL_BOLD etc.) from an attribute nr.
 * Only to be used when "attr" > HL_ALL.
 */
    int
syn_attr2attr(int attr)
{
    attrentry_T	*aep;

#ifdef FEAT_GUI
    if (gui.in_use)
	aep = syn_gui_attr2entry(attr);
    else
#endif
	if (IS_CTERM)
	    aep = syn_cterm_attr2entry(attr);
	else
	    aep = syn_term_attr2entry(attr);

    if (aep == NULL)	    // highlighting not set
	return 0;
    return aep->ae_attr;
}


    attrentry_T *
syn_term_attr2entry(int attr)
{
    attr -= ATTR_OFF;
    if (attr >= term_attr_table.ga_len)	    // did ":syntax clear"
	return NULL;
    return &(TERM_ATTR_ENTRY(attr));
}

    attrentry_T *
syn_cterm_attr2entry(int attr)
{
    attr -= ATTR_OFF;
    if (attr >= cterm_attr_table.ga_len)	// did ":syntax clear"
	return NULL;
    return &(CTERM_ATTR_ENTRY(attr));
}

#define LIST_ATTR   1
#define LIST_STRING 2
#define LIST_INT    3

    static void
highlight_list_one(int id)
{
    hl_group_T	    *sgp;
    int		    didh = FALSE;

    sgp = &HL_TABLE()[id - 1];	    // index is ID minus one

    if (message_filtered(sgp->sg_name))
	return;

    didh = highlight_list_arg(id, didh, LIST_ATTR,
				    sgp->sg_term, NULL, "term");
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_start, "start");
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_stop, "stop");

    didh = highlight_list_arg(id, didh, LIST_ATTR,
				    sgp->sg_cterm, NULL, "cterm");
    didh = highlight_list_arg(id, didh, LIST_INT,
				    sgp->sg_cterm_fg, NULL, "ctermfg");
    didh = highlight_list_arg(id, didh, LIST_INT,
				    sgp->sg_cterm_bg, NULL, "ctermbg");
    didh = highlight_list_arg(id, didh, LIST_INT,
				    sgp->sg_cterm_ul, NULL, "ctermul");

#if defined(FEAT_GUI) || defined(FEAT_EVAL)
    didh = highlight_list_arg(id, didh, LIST_ATTR,
				    sgp->sg_gui, NULL, "gui");
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_gui_fg_name, "guifg");
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_gui_bg_name, "guibg");
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_gui_sp_name, "guisp");
#endif
#ifdef FEAT_GUI
    didh = highlight_list_arg(id, didh, LIST_STRING,
				    0, sgp->sg_font_name, "font");
#endif

    if (sgp->sg_link && !got_int)
    {
	(void)syn_list_header(didh, 9999, id);
	didh = TRUE;
	msg_puts_attr("links to", HL_ATTR(HLF_D));
	msg_putchar(' ');
	msg_outtrans(HL_TABLE()[HL_TABLE()[id - 1].sg_link - 1].sg_name);
    }

    if (!didh)
	highlight_list_arg(id, didh, LIST_STRING, 0, (char_u *)"cleared", "");
#ifdef FEAT_EVAL
    if (p_verbose > 0)
	last_set_msg(sgp->sg_script_ctx);
#endif
}

    static int
highlight_list_arg(
    int		id,
    int		didh,
    int		type,
    int		iarg,
    char_u	*sarg,
    char	*name)
{
    char_u	buf[MAX_ATTR_LEN];
    char_u	*ts;
    int		i;

    if (got_int)
	return FALSE;

    if (type == LIST_STRING ? (sarg == NULL) : (iarg == 0))
	return didh;

    ts = buf;
    if (type == LIST_INT)
	sprintf((char *)buf, "%d", iarg - 1);
    else if (type == LIST_STRING)
	ts = sarg;
    else // type == LIST_ATTR
    {
	buf[0] = NUL;
	for (i = 0; hl_attr_table[i] != 0; ++i)
	{
	    if (iarg & hl_attr_table[i])
	    {
		if (buf[0] != NUL)
		    vim_strcat(buf, (char_u *)",", MAX_ATTR_LEN);
		vim_strcat(buf, (char_u *)hl_name_table[i], MAX_ATTR_LEN);
		iarg &= ~hl_attr_table[i];	    // don't want "inverse"
	    }
	}
    }

    (void)syn_list_header(didh,
	    (int)(vim_strsize(ts) + STRLEN(name) + 1), id);
    didh = TRUE;
    if (!got_int)
    {
	if (*name != NUL)
	{
	    msg_puts_attr(name, HL_ATTR(HLF_D));
	    msg_puts_attr("=", HL_ATTR(HLF_D));
	}
	msg_outtrans(ts);
    }
    return didh;
}

#if (((defined(FEAT_EVAL) || defined(FEAT_PRINTER))) && defined(FEAT_SYN_HL)) || defined(PROTO)
/*
 * Return "1" if highlight group "id" has attribute "flag".
 * Return NULL otherwise.
 */
    char_u *
highlight_has_attr(
    int		id,
    int		flag,
    int		modec)	// 'g' for GUI, 'c' for cterm, 't' for term
{
    int		attr;

    if (id <= 0 || id > highlight_ga.ga_len)
	return NULL;

#if defined(FEAT_GUI) || defined(FEAT_EVAL)
    if (modec == 'g')
	attr = HL_TABLE()[id - 1].sg_gui;
    else
#endif
    {
	if (modec == 'c')
	    attr = HL_TABLE()[id - 1].sg_cterm;
	else
	    attr = HL_TABLE()[id - 1].sg_term;
    }

    if (attr & flag)
	return (char_u *)"1";
    return NULL;
}
#endif

#if (defined(FEAT_SYN_HL) && defined(FEAT_EVAL)) || defined(PROTO)
/*
 * Return color name of highlight group "id".
 */
    char_u *
highlight_color(
    int		id,
    char_u	*what,	// "font", "fg", "bg", "sp", "ul", "fg#", "bg#" or "sp#"
    int		modec)	// 'g' for GUI, 'c' for cterm, 't' for term
{
    static char_u	name[20];
    int			n;
    int			fg = FALSE;
    int			sp = FALSE;
    int			ul = FALSE;
    int			font = FALSE;

    if (id <= 0 || id > highlight_ga.ga_len)
	return NULL;

    if (TOLOWER_ASC(what[0]) == 'f' && TOLOWER_ASC(what[1]) == 'g')
	fg = TRUE;
    else if (TOLOWER_ASC(what[0]) == 'f' && TOLOWER_ASC(what[1]) == 'o'
	     && TOLOWER_ASC(what[2]) == 'n' && TOLOWER_ASC(what[3]) == 't')
	font = TRUE;
    else if (TOLOWER_ASC(what[0]) == 's' && TOLOWER_ASC(what[1]) == 'p')
	sp = TRUE;
    else if (TOLOWER_ASC(what[0]) == 'u' && TOLOWER_ASC(what[1]) == 'l')
	ul = TRUE;
    else if (!(TOLOWER_ASC(what[0]) == 'b' && TOLOWER_ASC(what[1]) == 'g'))
	return NULL;
    if (modec == 'g')
    {
# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
#  ifdef FEAT_GUI
	// return font name
	if (font)
	    return HL_TABLE()[id - 1].sg_font_name;
#  endif

	// return #RRGGBB form (only possible when GUI is running)
	if ((USE_24BIT) && what[2] == '#')
	{
	    guicolor_T		color;
	    long_u		rgb;
	    static char_u	buf[10];

	    if (fg)
		color = HL_TABLE()[id - 1].sg_gui_fg;
	    else if (sp)
		color = HL_TABLE()[id - 1].sg_gui_sp;
	    else
		color = HL_TABLE()[id - 1].sg_gui_bg;
	    if (color == INVALCOLOR)
		return NULL;
	    rgb = (long_u)GUI_MCH_GET_RGB(color);
	    sprintf((char *)buf, "#%02x%02x%02x",
				      (unsigned)(rgb >> 16),
				      (unsigned)(rgb >> 8) & 255,
				      (unsigned)rgb & 255);
	    return buf;
	}
# endif
	if (fg)
	    return (HL_TABLE()[id - 1].sg_gui_fg_name);
	if (sp)
	    return (HL_TABLE()[id - 1].sg_gui_sp_name);
	return (HL_TABLE()[id - 1].sg_gui_bg_name);
    }
    if (font || sp)
	return NULL;
    if (modec == 'c')
    {
	if (fg)
	    n = HL_TABLE()[id - 1].sg_cterm_fg - 1;
	else if (ul)
	    n = HL_TABLE()[id - 1].sg_cterm_ul - 1;
	else
	    n = HL_TABLE()[id - 1].sg_cterm_bg - 1;
	if (n < 0)
	    return NULL;
	sprintf((char *)name, "%d", n);
	return name;
    }
    // term doesn't have color
    return NULL;
}
#endif

#if (defined(FEAT_SYN_HL) \
	    && (defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)) \
	&& defined(FEAT_PRINTER)) || defined(PROTO)
/*
 * Return color name of highlight group "id" as RGB value.
 */
    long_u
highlight_gui_color_rgb(
    int		id,
    int		fg)	// TRUE = fg, FALSE = bg
{
    guicolor_T	color;

    if (id <= 0 || id > highlight_ga.ga_len)
	return 0L;

    if (fg)
	color = HL_TABLE()[id - 1].sg_gui_fg;
    else
	color = HL_TABLE()[id - 1].sg_gui_bg;

    if (color == INVALCOLOR)
	return 0L;

    return GUI_MCH_GET_RGB(color);
}
#endif

/*
 * Output the syntax list header.
 * Return TRUE when started a new line.
 */
    int
syn_list_header(
    int	    did_header,		// did header already
    int	    outlen,		// length of string that comes
    int	    id)			// highlight group id
{
    int	    endcol = 19;
    int	    newline = TRUE;
    int	    name_col = 0;

    if (!did_header)
    {
	msg_putchar('\n');
	if (got_int)
	    return TRUE;
	msg_outtrans(HL_TABLE()[id - 1].sg_name);
	name_col = msg_col;
	endcol = 15;
    }
    else if (msg_col + outlen + 1 >= Columns)
    {
	msg_putchar('\n');
	if (got_int)
	    return TRUE;
    }
    else
    {
	if (msg_col >= endcol)	// wrap around is like starting a new line
	    newline = FALSE;
    }

    if (msg_col >= endcol)	// output at least one space
	endcol = msg_col + 1;
    if (Columns <= endcol)	// avoid hang for tiny window
	endcol = Columns - 1;

    msg_advance(endcol);

    // Show "xxx" with the attributes.
    if (!did_header)
    {
	if (endcol == Columns - 1 && endcol <= name_col)
	    msg_putchar(' ');
	msg_puts_attr("xxx", syn_id2attr(id));
	msg_putchar(' ');
    }

    return newline;
}

/*
 * Set the attribute numbers for a highlight group.
 * Called after one of the attributes has changed.
 */
    static void
set_hl_attr(
    int		idx)	    // index in array
{
    attrentry_T	    at_en;
    hl_group_T	    *sgp = HL_TABLE() + idx;

    // The "Normal" group doesn't need an attribute number
    if (sgp->sg_name_u != NULL && STRCMP(sgp->sg_name_u, "NORMAL") == 0)
	return;

#ifdef FEAT_GUI
    // For the GUI mode: If there are other than "normal" highlighting
    // attributes, need to allocate an attr number.
    if (sgp->sg_gui_fg == INVALCOLOR
	    && sgp->sg_gui_bg == INVALCOLOR
	    && sgp->sg_gui_sp == INVALCOLOR
	    && sgp->sg_font == NOFONT
# ifdef FEAT_XFONTSET
	    && sgp->sg_fontset == NOFONTSET
# endif
	    )
    {
	sgp->sg_gui_attr = sgp->sg_gui;
    }
    else
    {
	at_en.ae_attr = sgp->sg_gui;
	at_en.ae_u.gui.fg_color = sgp->sg_gui_fg;
	at_en.ae_u.gui.bg_color = sgp->sg_gui_bg;
	at_en.ae_u.gui.sp_color = sgp->sg_gui_sp;
	at_en.ae_u.gui.font = sgp->sg_font;
# ifdef FEAT_XFONTSET
	at_en.ae_u.gui.fontset = sgp->sg_fontset;
# endif
	sgp->sg_gui_attr = get_attr_entry(&gui_attr_table, &at_en);
    }
#endif
    // For the term mode: If there are other than "normal" highlighting
    // attributes, need to allocate an attr number.
    if (sgp->sg_start == NULL && sgp->sg_stop == NULL)
	sgp->sg_term_attr = sgp->sg_term;
    else
    {
	at_en.ae_attr = sgp->sg_term;
	at_en.ae_u.term.start = sgp->sg_start;
	at_en.ae_u.term.stop = sgp->sg_stop;
	sgp->sg_term_attr = get_attr_entry(&term_attr_table, &at_en);
    }

    // For the color term mode: If there are other than "normal"
    // highlighting attributes, need to allocate an attr number.
    if (sgp->sg_cterm_fg == 0 && sgp->sg_cterm_bg == 0 && sgp->sg_cterm_ul == 0
# ifdef FEAT_TERMGUICOLORS
	    && sgp->sg_gui_fg == INVALCOLOR
	    && sgp->sg_gui_bg == INVALCOLOR
	    && sgp->sg_gui_sp == INVALCOLOR
# endif
	    )
	sgp->sg_cterm_attr = sgp->sg_cterm;
    else
    {
	at_en.ae_attr = sgp->sg_cterm;
	at_en.ae_u.cterm.fg_color = sgp->sg_cterm_fg;
	at_en.ae_u.cterm.bg_color = sgp->sg_cterm_bg;
	at_en.ae_u.cterm.ul_color = sgp->sg_cterm_ul;
# ifdef FEAT_TERMGUICOLORS
	at_en.ae_u.cterm.fg_rgb = GUI_MCH_GET_RGB2(sgp->sg_gui_fg);
	at_en.ae_u.cterm.bg_rgb = GUI_MCH_GET_RGB2(sgp->sg_gui_bg);
	// Only use the underline/undercurl color when used, it may clear the
	// background color if not supported.
	if (sgp->sg_cterm & (HL_UNDERLINE | HL_UNDERCURL
			   | HL_UNDERDOUBLE | HL_UNDERDOTTED | HL_UNDERDASHED))
	    at_en.ae_u.cterm.ul_rgb = GUI_MCH_GET_RGB2(sgp->sg_gui_sp);
	else
	    at_en.ae_u.cterm.ul_rgb = INVALCOLOR;
	if (at_en.ae_u.cterm.fg_rgb == INVALCOLOR
		&& at_en.ae_u.cterm.bg_rgb == INVALCOLOR)
	{
	    // If both fg and bg are invalid fall back to the cterm colors.
	    // Helps when the GUI only uses an attribute, e.g. undercurl.
	    at_en.ae_u.cterm.fg_rgb = CTERMCOLOR;
	    at_en.ae_u.cterm.bg_rgb = CTERMCOLOR;
	}
# endif
	sgp->sg_cterm_attr = get_attr_entry(&cterm_attr_table, &at_en);
    }
}

/*
 * Lookup a highlight group name and return its ID.
 * If it is not found, 0 is returned.
 */
    int
syn_name2id(char_u *name)
{
    int		i;
    char_u	name_u[MAX_SYN_NAME + 1];

    // Avoid using stricmp() too much, it's slow on some systems
    // Avoid alloc()/free(), these are slow too.  ID names over 200 chars
    // don't deserve to be found!
    vim_strncpy(name_u, name, MAX_SYN_NAME);
    vim_strup(name_u);
    for (i = highlight_ga.ga_len; --i >= 0; )
	if (HL_TABLE()[i].sg_name_u != NULL
		&& STRCMP(name_u, HL_TABLE()[i].sg_name_u) == 0)
	    break;
    return i + 1;
}

/*
 * Lookup a highlight group name and return its attributes.
 * Return zero if not found.
 */
    int
syn_name2attr(char_u *name)
{
    int id = syn_name2id(name);

    if (id != 0)
	return syn_id2attr(id);
    return 0;
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return TRUE if highlight group "name" exists.
 */
    int
highlight_exists(char_u *name)
{
    return (syn_name2id(name) > 0);
}

# if defined(FEAT_SEARCH_EXTRA) || defined(PROTO)
/*
 * Return the name of highlight group "id".
 * When not a valid ID return an empty string.
 */
    char_u *
syn_id2name(int id)
{
    if (id <= 0 || id > highlight_ga.ga_len)
	return (char_u *)"";
    return HL_TABLE()[id - 1].sg_name;
}
# endif
#endif

/*
 * Like syn_name2id(), but take a pointer + length argument.
 */
    int
syn_namen2id(char_u *linep, int len)
{
    char_u  *name;
    int	    id = 0;

    name = vim_strnsave(linep, len);
    if (name == NULL)
	return 0;

    id = syn_name2id(name);
    vim_free(name);
    return id;
}

/*
 * Find highlight group name in the table and return its ID.
 * The argument is a pointer to the name and the length of the name.
 * If it doesn't exist yet, a new entry is created.
 * Return 0 for failure.
 */
    int
syn_check_group(char_u *pp, int len)
{
    int	    id;
    char_u  *name;

    if (len > MAX_SYN_NAME)
    {
	emsg(_(e_highlight_group_name_too_long));
	return 0;
    }
    name = vim_strnsave(pp, len);
    if (name == NULL)
	return 0;

    id = syn_name2id(name);
    if (id == 0)			// doesn't exist yet
	id = syn_add_group(name);
    else
	vim_free(name);
    return id;
}

/*
 * Add new highlight group and return its ID.
 * "name" must be an allocated string, it will be consumed.
 * Return 0 for failure.
 */
    static int
syn_add_group(char_u *name)
{
    char_u	*p;
    char_u	*name_up;

    // Check that the name is ASCII letters, digits and underscore.
    for (p = name; *p != NUL; ++p)
    {
	if (!vim_isprintc(*p))
	{
	    emsg(_(e_unprintable_character_in_group_name));
	    vim_free(name);
	    return 0;
	}
	else if (!ASCII_ISALNUM(*p) && *p != '_')
	{
	    // This is an error, but since there previously was no check only
	    // give a warning.
	    msg_source(HL_ATTR(HLF_W));
	    msg(_("W18: Invalid character in group name"));
	    break;
	}
    }

    // First call for this growarray: init growing array.
    if (highlight_ga.ga_data == NULL)
    {
	highlight_ga.ga_itemsize = sizeof(hl_group_T);
	highlight_ga.ga_growsize = 10;
    }

    if (highlight_ga.ga_len >= MAX_HL_ID)
    {
	emsg(_(e_too_many_highlight_and_syntax_groups));
	vim_free(name);
	return 0;
    }

    // Make room for at least one other syntax_highlight entry.
    if (ga_grow(&highlight_ga, 1) == FAIL)
    {
	vim_free(name);
	return 0;
    }

    name_up = vim_strsave_up(name);
    if (name_up == NULL)
    {
	vim_free(name);
	return 0;
    }

    CLEAR_POINTER(&(HL_TABLE()[highlight_ga.ga_len]));
    HL_TABLE()[highlight_ga.ga_len].sg_name = name;
    HL_TABLE()[highlight_ga.ga_len].sg_name_u = name_up;
#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
    HL_TABLE()[highlight_ga.ga_len].sg_gui_bg = INVALCOLOR;
    HL_TABLE()[highlight_ga.ga_len].sg_gui_fg = INVALCOLOR;
    HL_TABLE()[highlight_ga.ga_len].sg_gui_sp = INVALCOLOR;
#endif
    ++highlight_ga.ga_len;

    return highlight_ga.ga_len;		    // ID is index plus one
}

/*
 * When, just after calling syn_add_group(), an error is discovered, this
 * function deletes the new name.
 */
    static void
syn_unadd_group(void)
{
    --highlight_ga.ga_len;
    vim_free(HL_TABLE()[highlight_ga.ga_len].sg_name);
    vim_free(HL_TABLE()[highlight_ga.ga_len].sg_name_u);
}

/*
 * Translate a group ID to highlight attributes.
 * "hl_id" must be valid: > 0, caller must check.
 */
    int
syn_id2attr(int hl_id)
{
    int		attr;
    hl_group_T	*sgp;

    hl_id = syn_get_final_id(hl_id);
    sgp = &HL_TABLE()[hl_id - 1];	    // index is ID minus one

#ifdef FEAT_GUI
    // Only use GUI attr when the GUI is being used.
    if (gui.in_use)
	attr = sgp->sg_gui_attr;
    else
#endif
	if (IS_CTERM)
	    attr = sgp->sg_cterm_attr;
	else
	    attr = sgp->sg_term_attr;

    return attr;
}

#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
/*
 * Get the GUI colors and attributes for a group ID.
 * NOTE: the colors will be INVALCOLOR when not set, the color otherwise.
 */
    int
syn_id2colors(int hl_id, guicolor_T *fgp, guicolor_T *bgp)
{
    hl_group_T	*sgp;

    hl_id = syn_get_final_id(hl_id);
    sgp = &HL_TABLE()[hl_id - 1];	    // index is ID minus one

    *fgp = sgp->sg_gui_fg;
    *bgp = sgp->sg_gui_bg;
    return sgp->sg_gui;
}
#endif

#if (defined(MSWIN) \
	    && (!defined(FEAT_GUI_MSWIN) || defined(VIMDLL)) \
	    && defined(FEAT_TERMGUICOLORS)) \
	|| defined(FEAT_TERMINAL) || defined(PROTO)
    void
syn_id2cterm_bg(int hl_id, int *fgp, int *bgp)
{
    hl_group_T	*sgp;

    hl_id = syn_get_final_id(hl_id);
    sgp = &HL_TABLE()[hl_id - 1];	    // index is ID minus one
    *fgp = sgp->sg_cterm_fg - 1;
    *bgp = sgp->sg_cterm_bg - 1;
}
#endif

/*
 * Translate a group ID to the final group ID (following links).
 */
    int
syn_get_final_id(int hl_id)
{
    int		count;
    hl_group_T	*sgp;

    if (hl_id > highlight_ga.ga_len || hl_id < 1)
	return 0;			// Can be called from eval!!

    // Follow links until there is no more.
    // Look out for loops!  Break after 100 links.
    for (count = 100; --count >= 0; )
    {
	sgp = &HL_TABLE()[hl_id - 1];	    // index is ID minus one
	if (sgp->sg_link == 0 || sgp->sg_link > highlight_ga.ga_len)
	    break;
	hl_id = sgp->sg_link;
    }

    return hl_id;
}

#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
/*
 * Call this function just after the GUI has started.
 * Also called when 'termguicolors' was set, gui.in_use will be FALSE then.
 * It finds the font and color handles for the highlighting groups.
 */
    void
highlight_gui_started(void)
{
    int	    idx;

    // First get the colors from the "Normal" and "Menu" group, if set
    if (USE_24BIT)
	set_normal_colors();

    for (idx = 0; idx < highlight_ga.ga_len; ++idx)
	gui_do_one_color(idx, FALSE, FALSE);

    highlight_changed();
}

    static void
gui_do_one_color(
    int		idx,
    int		do_menu UNUSED,	   // TRUE: might set the menu font
    int		do_tooltip UNUSED) // TRUE: might set the tooltip font
{
    int		didit = FALSE;

# ifdef FEAT_GUI
#  ifdef FEAT_TERMGUICOLORS
    if (gui.in_use)
#  endif
	if (HL_TABLE()[idx].sg_font_name != NULL)
	{
	    hl_do_font(idx, HL_TABLE()[idx].sg_font_name, FALSE, do_menu,
							    do_tooltip, TRUE);
	    didit = TRUE;
	}
# endif
    if (HL_TABLE()[idx].sg_gui_fg_name != NULL)
    {
	HL_TABLE()[idx].sg_gui_fg =
			    color_name2handle(HL_TABLE()[idx].sg_gui_fg_name);
	didit = TRUE;
    }
    if (HL_TABLE()[idx].sg_gui_bg_name != NULL)
    {
	HL_TABLE()[idx].sg_gui_bg =
			    color_name2handle(HL_TABLE()[idx].sg_gui_bg_name);
	didit = TRUE;
    }
    if (HL_TABLE()[idx].sg_gui_sp_name != NULL)
    {
	HL_TABLE()[idx].sg_gui_sp =
			    color_name2handle(HL_TABLE()[idx].sg_gui_sp_name);
	didit = TRUE;
    }
    if (didit)	// need to get a new attr number
	set_hl_attr(idx);
}
#endif

#if defined(USER_HIGHLIGHT) && defined(FEAT_STL_OPT)
/*
 * Apply difference between User[1-9] and HLF_S to HLF_SNC, HLF_ST or HLF_STNC.
 */
    static void
combine_stl_hlt(
	int id,
	int id_S,
	int id_alt,
	int hlcnt,
	int i,
	int hlf,
	int *table)
{
    hl_group_T *hlt = HL_TABLE();

    if (id_alt == 0)
    {
	CLEAR_POINTER(&hlt[hlcnt + i]);
	hlt[hlcnt + i].sg_term = highlight_attr[hlf];
	hlt[hlcnt + i].sg_cterm = highlight_attr[hlf];
#  if defined(FEAT_GUI) || defined(FEAT_EVAL)
	hlt[hlcnt + i].sg_gui = highlight_attr[hlf];
#  endif
    }
    else
	mch_memmove(&hlt[hlcnt + i],
		    &hlt[id_alt - 1],
		    sizeof(hl_group_T));
    hlt[hlcnt + i].sg_link = 0;

    hlt[hlcnt + i].sg_term ^=
	hlt[id - 1].sg_term ^ hlt[id_S - 1].sg_term;
    if (hlt[id - 1].sg_start != hlt[id_S - 1].sg_start)
	hlt[hlcnt + i].sg_start = hlt[id - 1].sg_start;
    if (hlt[id - 1].sg_stop != hlt[id_S - 1].sg_stop)
	hlt[hlcnt + i].sg_stop = hlt[id - 1].sg_stop;
    hlt[hlcnt + i].sg_cterm ^=
	hlt[id - 1].sg_cterm ^ hlt[id_S - 1].sg_cterm;
    if (hlt[id - 1].sg_cterm_fg != hlt[id_S - 1].sg_cterm_fg)
	hlt[hlcnt + i].sg_cterm_fg = hlt[id - 1].sg_cterm_fg;
    if (hlt[id - 1].sg_cterm_bg != hlt[id_S - 1].sg_cterm_bg)
	hlt[hlcnt + i].sg_cterm_bg = hlt[id - 1].sg_cterm_bg;
#  if defined(FEAT_GUI) || defined(FEAT_EVAL)
    hlt[hlcnt + i].sg_gui ^=
	hlt[id - 1].sg_gui ^ hlt[id_S - 1].sg_gui;
#  endif
#  ifdef FEAT_GUI
    if (hlt[id - 1].sg_gui_fg != hlt[id_S - 1].sg_gui_fg)
	hlt[hlcnt + i].sg_gui_fg = hlt[id - 1].sg_gui_fg;
    if (hlt[id - 1].sg_gui_bg != hlt[id_S - 1].sg_gui_bg)
	hlt[hlcnt + i].sg_gui_bg = hlt[id - 1].sg_gui_bg;
    if (hlt[id - 1].sg_gui_sp != hlt[id_S - 1].sg_gui_sp)
	hlt[hlcnt + i].sg_gui_sp = hlt[id - 1].sg_gui_sp;
    if (hlt[id - 1].sg_font != hlt[id_S - 1].sg_font)
	hlt[hlcnt + i].sg_font = hlt[id - 1].sg_font;
#   ifdef FEAT_XFONTSET
    if (hlt[id - 1].sg_fontset != hlt[id_S - 1].sg_fontset)
	hlt[hlcnt + i].sg_fontset = hlt[id - 1].sg_fontset;
#   endif
#  endif
    highlight_ga.ga_len = hlcnt + i + 1;
    set_hl_attr(hlcnt + i);	// At long last we can apply
    table[i] = syn_id2attr(hlcnt + i + 1);
}
#endif

/*
 * Translate the 'highlight' option into attributes in highlight_attr[] and
 * set up the user highlights User1..9.  If FEAT_STL_OPT is in use, a set of
 * corresponding highlights to use on top of HLF_SNC is computed.
 * Called only when the 'highlight' option has been changed and upon first
 * screen redraw after any :highlight command.
 * Return FAIL when an invalid flag is found in 'highlight'.  OK otherwise.
 */
    int
highlight_changed(void)
{
    int		hlf;
    int		i;
    char_u	*p;
    int		attr;
    char_u	*end;
    int		id;
#ifdef USER_HIGHLIGHT
    char_u      userhl[30];  // use 30 to avoid compiler warning
# ifdef FEAT_STL_OPT
    int		id_S = -1;
    int		id_SNC = 0;
#  ifdef FEAT_TERMINAL
    int		id_ST = 0;
    int		id_STNC = 0;
#  endif
    int		hlcnt;
# endif
#endif
    static int	hl_flags[HLF_COUNT] = HL_FLAGS;

    need_highlight_changed = FALSE;

#ifdef FEAT_TERMINAL
    term_update_colors_all();
    term_update_wincolor_all();
#endif

    // Clear all attributes.
    for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
	highlight_attr[hlf] = 0;

    // First set all attributes to their default value.
    // Then use the attributes from the 'highlight' option.
    for (i = 0; i < 2; ++i)
    {
	if (i)
	    p = p_hl;
	else
	    p = get_highlight_default();
	if (p == NULL)	    // just in case
	    continue;

	while (*p)
	{
	    for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
		if (hl_flags[hlf] == *p)
		    break;
	    ++p;
	    if (hlf == (int)HLF_COUNT || *p == NUL)
		return FAIL;

	    // Allow several hl_flags to be combined, like "bu" for
	    // bold-underlined.
	    attr = 0;
	    for ( ; *p && *p != ','; ++p)	    // parse up to comma
	    {
		if (VIM_ISWHITE(*p))		    // ignore white space
		    continue;

		if (attr > HL_ALL)  // Combination with ':' is not allowed.
		    return FAIL;

		switch (*p)
		{
		    case 'b':	attr |= HL_BOLD;
				break;
		    case 'i':	attr |= HL_ITALIC;
				break;
		    case '-':
		    case 'n':			    // no highlighting
				break;
		    case 'r':	attr |= HL_INVERSE;
				break;
		    case 's':	attr |= HL_STANDOUT;
				break;
		    case 'u':	attr |= HL_UNDERLINE;
				break;
		    case 'c':	attr |= HL_UNDERCURL;
				break;
		    case '2':	attr |= HL_UNDERDOUBLE;
				break;
		    case 'd':	attr |= HL_UNDERDOTTED;
				break;
		    case '=':	attr |= HL_UNDERDASHED;
				break;
		    case 't':	attr |= HL_STRIKETHROUGH;
				break;
		    case ':':	++p;		    // highlight group name
				if (attr || *p == NUL)	 // no combinations
				    return FAIL;
				end = vim_strchr(p, ',');
				if (end == NULL)
				    end = p + STRLEN(p);
				id = syn_check_group(p, (int)(end - p));
				if (id == 0)
				    return FAIL;
				attr = syn_id2attr(id);
				p = end - 1;
#if defined(FEAT_STL_OPT) && defined(USER_HIGHLIGHT)
				if (hlf == (int)HLF_SNC)
				    id_SNC = syn_get_final_id(id);
# ifdef FEAT_TERMINAL
				else if (hlf == (int)HLF_ST)
				    id_ST = syn_get_final_id(id);
				else if (hlf == (int)HLF_STNC)
				    id_STNC = syn_get_final_id(id);
# endif
				else if (hlf == (int)HLF_S)
				    id_S = syn_get_final_id(id);
#endif
				break;
		    default:	return FAIL;
		}
	    }
	    highlight_attr[hlf] = attr;

	    p = skip_to_option_part(p);	    // skip comma and spaces
	}
    }

#ifdef USER_HIGHLIGHT
    // Setup the user highlights
    //
    // Temporarily utilize 28 more hl entries:
    // 9 for User1-User9 combined with StatusLineNC
    // 9 for User1-User9 combined with StatusLineTerm
    // 9 for User1-User9 combined with StatusLineTermNC
    // 1 for StatusLine default
    // Have to be in there simultaneously in case of table overflows in
    // get_attr_entry()
# ifdef FEAT_STL_OPT
    if (ga_grow(&highlight_ga, 28) == FAIL)
	return FAIL;
    hlcnt = highlight_ga.ga_len;
    if (id_S == -1)
    {
	// Make sure id_S is always valid to simplify code below. Use the last
	// entry.
	CLEAR_POINTER(&HL_TABLE()[hlcnt + 27]);
	HL_TABLE()[hlcnt + 18].sg_term = highlight_attr[HLF_S];
	id_S = hlcnt + 19;
    }
# endif
    for (i = 0; i < 9; i++)
    {
	sprintf((char *)userhl, "User%d", i + 1);
	id = syn_name2id(userhl);
	if (id == 0)
	{
	    highlight_user[i] = 0;
# ifdef FEAT_STL_OPT
	    highlight_stlnc[i] = 0;
#  ifdef FEAT_TERMINAL
	    highlight_stlterm[i] = 0;
	    highlight_stltermnc[i] = 0;
#  endif
# endif
	}
	else
	{
	    highlight_user[i] = syn_id2attr(id);
# ifdef FEAT_STL_OPT
	    combine_stl_hlt(id, id_S, id_SNC, hlcnt, i,
						     HLF_SNC, highlight_stlnc);
#  ifdef FEAT_TERMINAL
	    combine_stl_hlt(id, id_S, id_ST, hlcnt + 9, i,
						    HLF_ST, highlight_stlterm);
	    combine_stl_hlt(id, id_S, id_STNC, hlcnt + 18, i,
						HLF_STNC, highlight_stltermnc);
#  endif
# endif
	}
    }
# ifdef FEAT_STL_OPT
    highlight_ga.ga_len = hlcnt;
# endif

#endif // USER_HIGHLIGHT

    return OK;
}

static void highlight_list(void);
static void highlight_list_two(int cnt, int attr);

/*
 * Handle command line completion for :highlight command.
 */
    void
set_context_in_highlight_cmd(expand_T *xp, char_u *arg)
{
    char_u	*p;

    // Default: expand group names
    xp->xp_context = EXPAND_HIGHLIGHT;
    xp->xp_pattern = arg;
    include_link = 2;
    include_default = 1;

    if (*arg == NUL)
	return;

    // (part of) subcommand already typed
    p = skiptowhite(arg);
    if (*p == NUL)
	return;

    // past "default" or group name
    include_default = 0;
    if (STRNCMP("default", arg, p - arg) == 0)
    {
	arg = skipwhite(p);
	xp->xp_pattern = arg;
	p = skiptowhite(arg);
    }
    if (*p == NUL)
	return;

    // past group name
    include_link = 0;
    if (arg[1] == 'i' && arg[0] == 'N')
	highlight_list();
    if (STRNCMP("link", arg, p - arg) == 0
	    || STRNCMP("clear", arg, p - arg) == 0)
    {
	xp->xp_pattern = skipwhite(p);
	p = skiptowhite(xp->xp_pattern);
	if (*p != NUL)		// past first group name
	{
	    xp->xp_pattern = skipwhite(p);
	    p = skiptowhite(xp->xp_pattern);
	}
    }
    if (*p != NUL)			// past group name(s)
	xp->xp_context = EXPAND_NOTHING;
}

/*
 * List highlighting matches in a nice way.
 */
    static void
highlight_list(void)
{
    int		i;

    for (i = 10; --i >= 0; )
	highlight_list_two(i, HL_ATTR(HLF_D));
    for (i = 40; --i >= 0; )
	highlight_list_two(99, 0);
}

    static void
highlight_list_two(int cnt, int attr)
{
    msg_puts_attr(&("N \bI \b!  \b"[cnt / 11]), attr);
    msg_clr_eos();
    out_flush();
    ui_delay(cnt == 99 ? 40L : (long)cnt * 50L, FALSE);
}

/*
 * Function given to ExpandGeneric() to obtain the list of group names.
 */
    char_u *
get_highlight_name(expand_T *xp UNUSED, int idx)
{
    return get_highlight_name_ext(xp, idx, TRUE);
}

/*
 * Obtain a highlight group name.
 * When "skip_cleared" is TRUE don't return a cleared entry.
 */
    char_u *
get_highlight_name_ext(expand_T *xp UNUSED, int idx, int skip_cleared)
{
    if (idx < 0)
	return NULL;

    // Items are never removed from the table, skip the ones that were
    // cleared.
    if (skip_cleared && idx < highlight_ga.ga_len && HL_TABLE()[idx].sg_cleared)
	return (char_u *)"";

    if (idx == highlight_ga.ga_len && include_none != 0)
	return (char_u *)"none";
    if (idx == highlight_ga.ga_len + include_none && include_default != 0)
	return (char_u *)"default";
    if (idx == highlight_ga.ga_len + include_none + include_default
							 && include_link != 0)
	return (char_u *)"link";
    if (idx == highlight_ga.ga_len + include_none + include_default + 1
							 && include_link != 0)
	return (char_u *)"clear";
    if (idx >= highlight_ga.ga_len)
	return NULL;
    return HL_TABLE()[idx].sg_name;
}

#if defined(FEAT_GUI) || defined(PROTO)
/*
 * Free all the highlight group fonts.
 * Used when quitting for systems which need it.
 */
    void
free_highlight_fonts(void)
{
    int	    idx;

    for (idx = 0; idx < highlight_ga.ga_len; ++idx)
    {
	gui_mch_free_font(HL_TABLE()[idx].sg_font);
	HL_TABLE()[idx].sg_font = NOFONT;
# ifdef FEAT_XFONTSET
	gui_mch_free_fontset(HL_TABLE()[idx].sg_fontset);
	HL_TABLE()[idx].sg_fontset = NOFONTSET;
# endif
    }

    gui_mch_free_font(gui.norm_font);
# ifdef FEAT_XFONTSET
    gui_mch_free_fontset(gui.fontset);
# endif
# ifndef FEAT_GUI_GTK
    gui_mch_free_font(gui.bold_font);
    gui_mch_free_font(gui.ital_font);
    gui_mch_free_font(gui.boldital_font);
# endif
}
#endif

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Convert each of the highlight attribute bits (bold, standout, underline,
 * etc.) set in 'hlattr' into a separate boolean item in a Dictionary with
 * the attribute name as the key.
 */
    static dict_T *
highlight_get_attr_dict(int hlattr)
{
    dict_T	*dict;
    int		i;

    dict = dict_alloc();
    if (dict == NULL)
	return NULL;

    for (i = 0; hl_attr_table[i] != 0; ++i)
    {
	if (hlattr & hl_attr_table[i])
	{
	    dict_add_bool(dict, hl_name_table[i], VVAL_TRUE);
	    hlattr &= ~hl_attr_table[i];	// don't want "inverse"
	}
    }

    return dict;
}

/*
 * Return the attributes of the highlight group at index 'hl_idx' as a
 * Dictionary. If 'resolve_link' is TRUE, then resolves the highlight group
 * links recursively.
 */
    static dict_T *
highlight_get_info(int hl_idx, int resolve_link)
{
    dict_T	*dict;
    hl_group_T	*sgp;
    dict_T	*attr_dict;
    int		hlgid;

    dict = dict_alloc();
    if (dict == NULL)
	return dict;

    sgp = &HL_TABLE()[hl_idx];
    // highlight group id is 1-based
    hlgid = hl_idx + 1;

    if (dict_add_string(dict, "name", sgp->sg_name) == FAIL)
	goto error;
    if (dict_add_number(dict, "id", hlgid) == FAIL)
	goto error;

    if (sgp->sg_link && resolve_link)
    {
	// resolve the highlight group link recursively
	while (sgp->sg_link)
	{
	    hlgid = sgp->sg_link;
	    sgp = &HL_TABLE()[sgp->sg_link - 1];
	}
    }

    if (sgp->sg_term != 0)
    {
	attr_dict = highlight_get_attr_dict(sgp->sg_term);
	if (attr_dict != NULL)
	    if (dict_add_dict(dict, "term", attr_dict) == FAIL)
		goto error;
    }
    if (sgp->sg_start != NULL)
	if (dict_add_string(dict, "start", sgp->sg_start) == FAIL)
	    goto error;
    if (sgp->sg_stop != NULL)
	if (dict_add_string(dict, "stop", sgp->sg_stop) == FAIL)
	    goto error;
    if (sgp->sg_cterm != 0)
    {
	attr_dict = highlight_get_attr_dict(sgp->sg_cterm);
	if (attr_dict != NULL)
	    if (dict_add_dict(dict, "cterm", attr_dict) == FAIL)
		goto error;
    }
    if (sgp->sg_cterm_fg != 0)
	if (dict_add_string(dict, "ctermfg",
		    highlight_color(hlgid, (char_u *)"fg", 'c')) == FAIL)
	    goto error;
    if (sgp->sg_cterm_bg != 0)
	if (dict_add_string(dict, "ctermbg",
			highlight_color(hlgid, (char_u *)"bg", 'c')) == FAIL)
	    goto error;
    if (sgp->sg_cterm_ul != 0)
	if (dict_add_string(dict, "ctermul",
			highlight_color(hlgid, (char_u *)"ul", 'c')) == FAIL)
	    goto error;
    if (sgp->sg_gui != 0)
    {
	attr_dict = highlight_get_attr_dict(sgp->sg_gui);
	if (attr_dict != NULL)
	    if (dict_add_dict(dict, "gui", attr_dict) == FAIL)
		goto error;
    }
    if (sgp->sg_gui_fg_name != NULL)
	if (dict_add_string(dict, "guifg",
			highlight_color(hlgid, (char_u *)"fg", 'g')) == FAIL)
	    goto error;
    if (sgp->sg_gui_bg_name != NULL)
	if (dict_add_string(dict, "guibg",
			highlight_color(hlgid, (char_u *)"bg", 'g')) == FAIL)
	    goto error;
    if (sgp->sg_gui_sp_name != NULL)
	if (dict_add_string(dict, "guisp",
			highlight_color(hlgid, (char_u *)"sp", 'g')) == FAIL)
	    goto error;
# ifdef FEAT_GUI
    if (sgp->sg_font_name != NULL)
	if (dict_add_string(dict, "font", sgp->sg_font_name) == FAIL)
	    goto error;
# endif
    if (sgp->sg_link)
    {
	char_u	*link;

	link = HL_TABLE()[sgp->sg_link - 1].sg_name;
	if (link != NULL && dict_add_string(dict, "linksto", link) == FAIL)
	    goto error;

	if (sgp->sg_deflink)
	    dict_add_bool(dict, "default", VVAL_TRUE);
    }
    if (dict_len(dict) == 2)
	// If only 'name' is present, then the highlight group is cleared.
	dict_add_bool(dict, "cleared", VVAL_TRUE);

    return dict;

error:
    vim_free(dict);
    return NULL;
}

/*
 * "hlget([name])" function
 * Return the attributes of a specific highlight group (if specified) or all
 * the highlight groups.
 */
    void
f_hlget(typval_T *argvars, typval_T *rettv)
{
    list_T	*list;
    dict_T	*dict;
    int		i;
    char_u	*hlarg = NULL;
    int		resolve_link = FALSE;

    if (rettv_list_alloc(rettv) == FAIL)
	return;

    if (check_for_opt_string_arg(argvars, 0) == FAIL
	    || (argvars[0].v_type != VAR_UNKNOWN
		&& check_for_opt_bool_arg(argvars, 1) == FAIL))
	return;

    if (argvars[0].v_type != VAR_UNKNOWN)
    {
	// highlight group name supplied
	hlarg = tv_get_string_chk(&argvars[0]);
	if (hlarg == NULL)
	    return;

	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    int error = FALSE;

	    resolve_link = tv_get_bool_chk(&argvars[1], &error);
	    if (error)
		return;
	}
    }

    list = rettv->vval.v_list;
    for (i = 0; i < highlight_ga.ga_len && !got_int; ++i)
    {
	if (hlarg == NULL || STRICMP(hlarg, HL_TABLE()[i].sg_name) == 0)
	{
	    dict = highlight_get_info(i, resolve_link);
	    if (dict != NULL)
		list_append_dict(list, dict);
	}
    }
}

/*
 * Returns the string value at 'dict[key]'. Returns NULL, if 'key' is not in
 * 'dict' or the value is not a string type. If the value is not a string type
 * or is NULL, then 'error' is set to TRUE.
 */
    static char_u *
hldict_get_string(dict_T *dict, char_u *key, int *error)
{
    dictitem_T	*di;

    *error = FALSE;
    di = dict_find(dict, key, -1);
    if (di == NULL)
	return NULL;

    if (di->di_tv.v_type != VAR_STRING || di->di_tv.vval.v_string == NULL)
    {
	emsg(_(e_string_required));
	*error = TRUE;
	return NULL;
    }

    return di->di_tv.vval.v_string;
}

/*
 * Convert the highlight attribute Dictionary at 'dict[key]' into a string
 * value in 'attr_str' of length 'len'. Returns FALSE if 'dict[key]' is not a
 * Dictionary or is NULL.
 */
    static int
hldict_attr_to_str(
	dict_T	*dict,
	char_u	*key,
	char_u	*attr_str,
	size_t	len)
{
    dictitem_T	*di;
    dict_T	*attrdict;
    int		i;
    char_u	*p;
    size_t	sz;

    attr_str[0] = NUL;
    di = dict_find(dict, key, -1);
    if (di == NULL)
	return TRUE;

    if (di->di_tv.v_type != VAR_DICT || di->di_tv.vval.v_dict == NULL)
    {
	emsg(_(e_dictionary_required));
	return FALSE;
    }

    attrdict = di->di_tv.vval.v_dict;

    // If the attribute dict is empty, then return NONE to clear the attributes
    if (dict_len(attrdict) == 0)
    {
	vim_strcat(attr_str, (char_u *)"NONE", len);
	return TRUE;
    }

    p = attr_str;
    for (i = 0; i < (int)ARRAY_LENGTH(hl_name_table); i++)
    {
	if (dict_get_bool(attrdict, hl_name_table[i], VVAL_FALSE) == VVAL_TRUE)
	{
	    if (p != attr_str && (size_t)(p - attr_str + 2) < len)
		STRCPY(p, (char_u *)",");
	    sz = STRLEN(hl_name_table[i]);
	    if (p - attr_str + sz + 1 < len)
	    {
		STRCPY(p, (char_u *)hl_name_table[i]);
		p += sz;
	    }
	}
    }

    return TRUE;
}

// Temporary buffer used to store the command string produced by hlset().
// IObuff cannot be used for this as the error messages produced by hlset()
// internally use IObuff.
#define	HLSETBUFSZ  512
static char_u hlsetBuf[HLSETBUFSZ + 1];

/*
 * Add the highlight attribute "attr" of length "attrlen" and "value" at
 * "dptr", which points into "hlsetBuf".
 * Returns the updated pointer.
 */
    static char_u *
add_attr_and_value(char_u *dptr, char_u *attr, int attrlen, char_u *value)
{
    size_t	vallen;

    // Do nothing if the value is not specified or is empty
    if (value == NULL || *value == NUL)
	return dptr;

    vallen = STRLEN(value);
    if (dptr + attrlen + vallen + 1 < hlsetBuf + HLSETBUFSZ)
    {
	STRCPY(dptr, attr);
	dptr += attrlen;
	STRCPY(dptr, value);
	dptr += vallen;
    }

    return dptr;
}

/*
 * Add or update a highlight group using 'dict' items. Returns TRUE if
 * successfully updated the highlight group.
 */
    static int
hlg_add_or_update(dict_T *dict)
{
    char_u	*name;
    int		error;
    char_u	term_attr[MAX_ATTR_LEN];
    char_u	cterm_attr[MAX_ATTR_LEN];
    char_u	gui_attr[MAX_ATTR_LEN];
    char_u	*start;
    char_u	*stop;
    char_u	*ctermfg;
    char_u	*ctermbg;
    char_u	*ctermul;
    char_u	*guifg;
    char_u	*guibg;
    char_u	*guisp;
# ifdef FEAT_GUI
    char_u	*font;
# endif
    int		forceit = FALSE;
    int		dodefault = FALSE;
    int		done = FALSE;
    char_u	*p;

    name = hldict_get_string(dict, (char_u *)"name", &error);
    if (name == NULL || *name == NUL || error)
	return FALSE;

    if (dict_get_bool(dict, "force", VVAL_FALSE) == VVAL_TRUE)
	forceit = TRUE;

    if (dict_get_bool(dict, "default", VVAL_FALSE) == VVAL_TRUE)
	dodefault = TRUE;

    if (dict_has_key(dict, "cleared"))
    {
	varnumber_T	cleared;

	// clear a highlight group
	cleared = dict_get_bool(dict, "cleared", FALSE);
	if (cleared == TRUE)
	{
	    vim_snprintf((char *)hlsetBuf, HLSETBUFSZ, "clear %s", name);
	    do_highlight(hlsetBuf, forceit, FALSE);
	    done = TRUE;
	}
    }

    if (dict_has_key(dict, "linksto"))
    {
	char_u	*linksto;

	// link highlight groups
	linksto = hldict_get_string(dict, (char_u *)"linksto", &error);
	if (linksto == NULL || *linksto == NUL || error)
	    return FALSE;

	vim_snprintf((char *)hlsetBuf, HLSETBUFSZ, "%slink %s %s",
				dodefault ? "default " : "", name, linksto);
	do_highlight(hlsetBuf, forceit, FALSE);

	done = TRUE;
    }

    // If 'cleared' or 'linksto' are specified, then don't process the other
    // attributes.
    if (done)
	return TRUE;

    start = hldict_get_string(dict, (char_u *)"start", &error);
    if (error)
	return FALSE;

    stop = hldict_get_string(dict, (char_u *)"stop", &error);
    if (error)
	return FALSE;

    if (!hldict_attr_to_str(dict, (char_u *)"term", term_attr,
							    sizeof(term_attr)))
	return FALSE;

    if (!hldict_attr_to_str(dict, (char_u *)"cterm", cterm_attr,
							   sizeof(cterm_attr)))
	return FALSE;

    ctermfg = hldict_get_string(dict, (char_u *)"ctermfg", &error);
    if (error)
	return FALSE;

    ctermbg = hldict_get_string(dict, (char_u *)"ctermbg", &error);
    if (error)
	return FALSE;

    ctermul = hldict_get_string(dict, (char_u *)"ctermul", &error);
    if (error)
	return FALSE;

    if (!hldict_attr_to_str(dict, (char_u *)"gui", gui_attr, sizeof(gui_attr)))
	return FALSE;

    guifg = hldict_get_string(dict, (char_u *)"guifg", &error);
    if (error)
	return FALSE;

    guibg = hldict_get_string(dict, (char_u *)"guibg", &error);
    if (error)
	return FALSE;

    guisp = hldict_get_string(dict, (char_u *)"guisp", &error);
    if (error)
	return FALSE;

# ifdef FEAT_GUI
    font = hldict_get_string(dict, (char_u *)"font", &error);
    if (error)
	return FALSE;
# endif

    // If none of the attributes are specified, then do nothing.
    if (term_attr[0] == NUL && start == NULL && stop == NULL
	    && cterm_attr[0] == NUL && ctermfg == NULL && ctermbg == NULL
	    && ctermul == NULL && gui_attr[0] == NUL
# ifdef FEAT_GUI
	    && font == NULL
# endif
	    && guifg == NULL && guibg == NULL && guisp == NULL
	    )
	return TRUE;

    hlsetBuf[0] = NUL;
    p = hlsetBuf;
    if (dodefault)
	p = add_attr_and_value(p, (char_u *)"default", 7, (char_u *)" ");
    p = add_attr_and_value(p, (char_u *)"", 0, name);
    p = add_attr_and_value(p, (char_u *)" term=", 6, term_attr);
    p = add_attr_and_value(p, (char_u *)" start=", 7, start);
    p = add_attr_and_value(p, (char_u *)" stop=", 6, stop);
    p = add_attr_and_value(p, (char_u *)" cterm=", 7, cterm_attr);
    p = add_attr_and_value(p, (char_u *)" ctermfg=", 9, ctermfg);
    p = add_attr_and_value(p, (char_u *)" ctermbg=", 9, ctermbg);
    p = add_attr_and_value(p, (char_u *)" ctermul=", 9, ctermul);
    p = add_attr_and_value(p, (char_u *)" gui=", 5, gui_attr);
# ifdef FEAT_GUI
    p = add_attr_and_value(p, (char_u *)" font=", 6, font);
# endif
    p = add_attr_and_value(p, (char_u *)" guifg=", 7, guifg);
    p = add_attr_and_value(p, (char_u *)" guibg=", 7, guibg);
    (void)add_attr_and_value(p, (char_u *)" guisp=", 7, guisp);

    do_highlight(hlsetBuf, forceit, FALSE);

    return TRUE;
}

/*
 * "hlset([{highlight_attr}])" function
 * Add or modify highlight groups
 */
    void
f_hlset(typval_T *argvars, typval_T *rettv)
{
    listitem_T	*li;
    dict_T	*dict;

    rettv->vval.v_number = -1;

    if (check_for_list_arg(argvars, 0) == FAIL)
	return;

    FOR_ALL_LIST_ITEMS(argvars->vval.v_list, li)
    {
	if (li->li_tv.v_type != VAR_DICT)
	{
	    emsg(_(e_dictionary_required));
	    return;
	}

	dict = li->li_tv.vval.v_dict;
	if (!hlg_add_or_update(dict))
	    return;
    }

    rettv->vval.v_number = 0;
}
#endif