new file mode 100644
--- /dev/null
+++ b/src/insexpand.c
@@ -0,0 +1,3992 @@
+/* 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.
+ */
+
+/*
+ * insexpand.c: functions for Insert mode completion
+ */
+
+#include "vim.h"
+
+#ifdef FEAT_INS_EXPAND
+/*
+ * Definitions used for CTRL-X submode.
+ * Note: If you change CTRL-X submode, you must also maintain ctrl_x_msgs[] and
+ * ctrl_x_mode_names[] below.
+ */
+# define CTRL_X_WANT_IDENT	0x100
+
+# define CTRL_X_NORMAL		0  /* CTRL-N CTRL-P completion, default */
+# define CTRL_X_NOT_DEFINED_YET	1
+# define CTRL_X_SCROLL		2
+# define CTRL_X_WHOLE_LINE	3
+# define CTRL_X_FILES		4
+# define CTRL_X_TAGS		(5 + CTRL_X_WANT_IDENT)
+# define CTRL_X_PATH_PATTERNS	(6 + CTRL_X_WANT_IDENT)
+# define CTRL_X_PATH_DEFINES	(7 + CTRL_X_WANT_IDENT)
+# define CTRL_X_FINISHED		8
+# define CTRL_X_DICTIONARY	(9 + CTRL_X_WANT_IDENT)
+# define CTRL_X_THESAURUS	(10 + CTRL_X_WANT_IDENT)
+# define CTRL_X_CMDLINE		11
+# define CTRL_X_FUNCTION		12
+# define CTRL_X_OMNI		13
+# define CTRL_X_SPELL		14
+# define CTRL_X_LOCAL_MSG	15	/* only used in "ctrl_x_msgs" */
+# define CTRL_X_EVAL		16	/* for builtin function complete() */
+
+# define CTRL_X_MSG(i) ctrl_x_msgs[(i) & ~CTRL_X_WANT_IDENT]
+
+// Message for CTRL-X mode, index is ctrl_x_mode.
+static char *ctrl_x_msgs[] =
+{
+    N_(" Keyword completion (^N^P)"), // CTRL_X_NORMAL, ^P/^N compl.
+    N_(" ^X mode (^]^D^E^F^I^K^L^N^O^Ps^U^V^Y)"),
+    NULL, // CTRL_X_SCROLL: depends on state
+    N_(" Whole line completion (^L^N^P)"),
+    N_(" File name completion (^F^N^P)"),
+    N_(" Tag completion (^]^N^P)"),
+    N_(" Path pattern completion (^N^P)"),
+    N_(" Definition completion (^D^N^P)"),
+    NULL, // CTRL_X_FINISHED
+    N_(" Dictionary completion (^K^N^P)"),
+    N_(" Thesaurus completion (^T^N^P)"),
+    N_(" Command-line completion (^V^N^P)"),
+    N_(" User defined completion (^U^N^P)"),
+    N_(" Omni completion (^O^N^P)"),
+    N_(" Spelling suggestion (s^N^P)"),
+    N_(" Keyword Local completion (^N^P)"),
+    NULL,   // CTRL_X_EVAL doesn't use msg.
+};
+
+static char *ctrl_x_mode_names[] = {
+	"keyword",
+	"ctrl_x",
+	"unknown",	    // CTRL_X_SCROLL
+	"whole_line",
+	"files",
+	"tags",
+	"path_patterns",
+	"path_defines",
+	"unknown",	    // CTRL_X_FINISHED
+	"dictionary",
+	"thesaurus",
+	"cmdline",
+	"function",
+	"omni",
+	"spell",
+	NULL,		    // CTRL_X_LOCAL_MSG only used in "ctrl_x_msgs"
+	"eval"
+};
+
+/*
+ * Array indexes used for cp_text[].
+ */
+#define CPT_ABBR	0	// "abbr"
+#define CPT_MENU	1	// "menu"
+#define CPT_KIND	2	// "kind"
+#define CPT_INFO	3	// "info"
+#define CPT_USER_DATA	4	// "user data"
+#define CPT_COUNT	5	// Number of entries
+
+/*
+ * Structure used to store one match for insert completion.
+ */
+typedef struct compl_S compl_T;
+struct compl_S
+{
+    compl_T	*cp_next;
+    compl_T	*cp_prev;
+    char_u	*cp_str;	/* matched text */
+    char	cp_icase;	/* TRUE or FALSE: ignore case */
+    char_u	*(cp_text[CPT_COUNT]);	/* text for the menu */
+    char_u	*cp_fname;	/* file containing the match, allocated when
+				 * cp_flags has FREE_FNAME */
+    int		cp_flags;	/* ORIGINAL_TEXT, CONT_S_IPOS or FREE_FNAME */
+    int		cp_number;	/* sequence number */
+};
+
+# define ORIGINAL_TEXT	(1)   /* the original text when the expansion begun */
+# define FREE_FNAME	(2)
+
+static char e_hitend[] = N_("Hit end of paragraph");
+# ifdef FEAT_COMPL_FUNC
+static char e_complwin[] = N_("E839: Completion function changed window");
+static char e_compldel[] = N_("E840: Completion function deleted text");
+# endif
+
+/*
+ * All the current matches are stored in a list.
+ * "compl_first_match" points to the start of the list.
+ * "compl_curr_match" points to the currently selected entry.
+ * "compl_shown_match" is different from compl_curr_match during
+ * ins_compl_get_exp().
+ */
+static compl_T    *compl_first_match = NULL;
+static compl_T    *compl_curr_match = NULL;
+static compl_T    *compl_shown_match = NULL;
+static compl_T    *compl_old_match = NULL;
+
+// After using a cursor key <Enter> selects a match in the popup menu,
+// otherwise it inserts a line break.
+static int	  compl_enter_selects = FALSE;
+
+// When "compl_leader" is not NULL only matches that start with this string
+// are used.
+static char_u	  *compl_leader = NULL;
+
+static int	  compl_get_longest = FALSE;	// put longest common string
+						// in compl_leader
+
+static int	  compl_no_insert = FALSE;	// FALSE: select & insert
+						// TRUE: noinsert
+static int	  compl_no_select = FALSE;	// FALSE: select & insert
+						// TRUE: noselect
+
+// Selected one of the matches.  When FALSE the match was edited or using the
+// longest common string.
+static int	  compl_used_match;
+
+// didn't finish finding completions.
+static int	  compl_was_interrupted = FALSE;
+
+// Set when character typed while looking for matches and it means we should
+// stop looking for matches.
+static int	  compl_interrupted = FALSE;
+
+static int	  compl_restarting = FALSE;	// don't insert match
+
+// When the first completion is done "compl_started" is set.  When it's
+// FALSE the word to be completed must be located.
+static int	  compl_started = FALSE;
+
+// Which Ctrl-X mode are we in?
+static int	  ctrl_x_mode = CTRL_X_NORMAL;
+
+static int	  compl_matches = 0;
+static char_u	  *compl_pattern = NULL;
+static int	  compl_direction = FORWARD;
+static int	  compl_shows_dir = FORWARD;
+static int	  compl_pending = 0;	    // > 1 for postponed CTRL-N
+static pos_T	  compl_startpos;
+static colnr_T	  compl_col = 0;	    // column where the text starts
+					    // that is being completed
+static char_u	  *compl_orig_text = NULL;  // text as it was before
+					    // completion started
+static int	  compl_cont_mode = 0;
+static expand_T	  compl_xp;
+
+static int	  compl_opt_refresh_always = FALSE;
+static int	  compl_opt_suppress_empty = FALSE;
+
+static int ins_compl_add(char_u *str, int len, int icase, char_u *fname, char_u **cptext, int cdir, int flags, int adup);
+static void ins_compl_longest_match(compl_T *match);
+static void ins_compl_del_pum(void);
+static void ins_compl_files(int count, char_u **files, int thesaurus, int flags, regmatch_T *regmatch, char_u *buf, int *dir);
+static char_u *find_line_end(char_u *ptr);
+static void ins_compl_free(void);
+static char_u *ins_compl_mode(void);
+static int  ins_compl_need_restart(void);
+static void ins_compl_new_leader(void);
+static int  ins_compl_len(void);
+static void ins_compl_restart(void);
+static void ins_compl_set_original_text(char_u *str);
+static void ins_compl_fixRedoBufForLeader(char_u *ptr_arg);
+# if defined(FEAT_COMPL_FUNC) || defined(FEAT_EVAL)
+static void ins_compl_add_list(list_T *list);
+static void ins_compl_add_dict(dict_T *dict);
+# endif
+static int  ins_compl_key2dir(int c);
+static int  ins_compl_pum_key(int c);
+static int  ins_compl_key2count(int c);
+static void show_pum(int prev_w_wrow, int prev_w_leftcol);
+static unsigned  quote_meta(char_u *dest, char_u *str, int len);
+#endif // FEAT_INS_EXPAND
+
+#ifdef FEAT_SPELL
+static void spell_back_to_badword(void);
+static int  spell_bad_len = 0;	// length of located bad word
+#endif
+
+#if defined(FEAT_INS_EXPAND) || defined(PROTO)
+/*
+ * CTRL-X pressed in Insert mode.
+ */
+    void
+ins_ctrl_x(void)
+{
+    // CTRL-X after CTRL-X CTRL-V doesn't do anything, so that CTRL-X
+    // CTRL-V works like CTRL-N
+    if (ctrl_x_mode != CTRL_X_CMDLINE)
+    {
+	// if the next ^X<> won't ADD nothing, then reset
+	// compl_cont_status
+	if (compl_cont_status & CONT_N_ADDS)
+	    compl_cont_status |= CONT_INTRPT;
+	else
+	    compl_cont_status = 0;
+	// We're not sure which CTRL-X mode it will be yet
+	ctrl_x_mode = CTRL_X_NOT_DEFINED_YET;
+	edit_submode = (char_u *)_(CTRL_X_MSG(ctrl_x_mode));
+	edit_submode_pre = NULL;
+	showmode();
+    }
+}
+
+/*
+ * Functions to check the current CTRL-X mode.
+ */
+int ctrl_x_mode_none(void) { return ctrl_x_mode == 0; }
+int ctrl_x_mode_normal(void) { return ctrl_x_mode == CTRL_X_NORMAL; }
+int ctrl_x_mode_scroll(void) { return ctrl_x_mode == CTRL_X_SCROLL; }
+int ctrl_x_mode_whole_line(void) { return ctrl_x_mode == CTRL_X_WHOLE_LINE; }
+int ctrl_x_mode_files(void) { return ctrl_x_mode == CTRL_X_FILES; }
+int ctrl_x_mode_tags(void) { return ctrl_x_mode == CTRL_X_TAGS; }
+int ctrl_x_mode_path_patterns(void) {
+				  return ctrl_x_mode == CTRL_X_PATH_PATTERNS; }
+int ctrl_x_mode_path_defines(void) {
+				   return ctrl_x_mode == CTRL_X_PATH_DEFINES; }
+int ctrl_x_mode_dictionary(void) { return ctrl_x_mode == CTRL_X_DICTIONARY; }
+int ctrl_x_mode_thesaurus(void) { return ctrl_x_mode == CTRL_X_THESAURUS; }
+int ctrl_x_mode_cmdline(void) { return ctrl_x_mode == CTRL_X_CMDLINE; }
+int ctrl_x_mode_function(void) { return ctrl_x_mode == CTRL_X_FUNCTION; }
+int ctrl_x_mode_omni(void) { return ctrl_x_mode == CTRL_X_OMNI; }
+int ctrl_x_mode_spell(void) { return ctrl_x_mode == CTRL_X_SPELL; }
+int ctrl_x_mode_line_or_eval(void) {
+       return ctrl_x_mode == CTRL_X_WHOLE_LINE || ctrl_x_mode == CTRL_X_EVAL; }
+
+/*
+ * Whether other than default completion has been selected.
+ */
+    int
+ctrl_x_mode_not_default(void)
+{
+    return ctrl_x_mode != CTRL_X_NORMAL;
+}
+
+/*
+ * Whether CTRL-X was typed without a following character.
+ */
+    int
+ctrl_x_mode_not_defined_yet(void)
+{
+    return ctrl_x_mode == CTRL_X_NOT_DEFINED_YET;
+}
+
+/*
+ * Return TRUE if the 'dict' or 'tsr' option can be used.
+ */
+    int
+has_compl_option(int dict_opt)
+{
+    if (dict_opt ? (*curbuf->b_p_dict == NUL && *p_dict == NUL
+# ifdef FEAT_SPELL
+							&& !curwin->w_p_spell
+# endif
+							)
+		 : (*curbuf->b_p_tsr == NUL && *p_tsr == NUL))
+    {
+	ctrl_x_mode = CTRL_X_NORMAL;
+	edit_submode = NULL;
+	msg_attr(dict_opt ? _("'dictionary' option is empty")
+			  : _("'thesaurus' option is empty"),
+							      HL_ATTR(HLF_E));
+	if (emsg_silent == 0)
+	{
+	    vim_beep(BO_COMPL);
+	    setcursor();
+	    out_flush();
+#ifdef FEAT_EVAL
+	    if (!get_vim_var_nr(VV_TESTING))
+#endif
+		ui_delay(2000L, FALSE);
+	}
+	return FALSE;
+    }
+    return TRUE;
+}
+
+/*
+ * Is the character 'c' a valid key to go to or keep us in CTRL-X mode?
+ * This depends on the current mode.
+ */
+    int
+vim_is_ctrl_x_key(int c)
+{
+    // Always allow ^R - let its results then be checked
+    if (c == Ctrl_R)
+	return TRUE;
+
+    // Accept <PageUp> and <PageDown> if the popup menu is visible.
+    if (ins_compl_pum_key(c))
+	return TRUE;
+
+    switch (ctrl_x_mode)
+    {
+	case 0:		    // Not in any CTRL-X mode
+	    return (c == Ctrl_N || c == Ctrl_P || c == Ctrl_X);
+	case CTRL_X_NOT_DEFINED_YET:
+	    return (   c == Ctrl_X || c == Ctrl_Y || c == Ctrl_E
+		    || c == Ctrl_L || c == Ctrl_F || c == Ctrl_RSB
+		    || c == Ctrl_I || c == Ctrl_D || c == Ctrl_P
+		    || c == Ctrl_N || c == Ctrl_T || c == Ctrl_V
+		    || c == Ctrl_Q || c == Ctrl_U || c == Ctrl_O
+		    || c == Ctrl_S || c == Ctrl_K || c == 's');
+	case CTRL_X_SCROLL:
+	    return (c == Ctrl_Y || c == Ctrl_E);
+	case CTRL_X_WHOLE_LINE:
+	    return (c == Ctrl_L || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_FILES:
+	    return (c == Ctrl_F || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_DICTIONARY:
+	    return (c == Ctrl_K || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_THESAURUS:
+	    return (c == Ctrl_T || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_TAGS:
+	    return (c == Ctrl_RSB || c == Ctrl_P || c == Ctrl_N);
+#ifdef FEAT_FIND_ID
+	case CTRL_X_PATH_PATTERNS:
+	    return (c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_PATH_DEFINES:
+	    return (c == Ctrl_D || c == Ctrl_P || c == Ctrl_N);
+#endif
+	case CTRL_X_CMDLINE:
+	    return (c == Ctrl_V || c == Ctrl_Q || c == Ctrl_P || c == Ctrl_N
+		    || c == Ctrl_X);
+#ifdef FEAT_COMPL_FUNC
+	case CTRL_X_FUNCTION:
+	    return (c == Ctrl_U || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_OMNI:
+	    return (c == Ctrl_O || c == Ctrl_P || c == Ctrl_N);
+#endif
+	case CTRL_X_SPELL:
+	    return (c == Ctrl_S || c == Ctrl_P || c == Ctrl_N);
+	case CTRL_X_EVAL:
+	    return (c == Ctrl_P || c == Ctrl_N);
+    }
+    internal_error("vim_is_ctrl_x_key()");
+    return FALSE;
+}
+
+/*
+ * Return TRUE when character "c" is part of the item currently being
+ * completed.  Used to decide whether to abandon complete mode when the menu
+ * is visible.
+ */
+    int
+ins_compl_accept_char(int c)
+{
+    if (ctrl_x_mode & CTRL_X_WANT_IDENT)
+	// When expanding an identifier only accept identifier chars.
+	return vim_isIDc(c);
+
+    switch (ctrl_x_mode)
+    {
+	case CTRL_X_FILES:
+	    // When expanding file name only accept file name chars. But not
+	    // path separators, so that "proto/<Tab>" expands files in
+	    // "proto", not "proto/" as a whole
+	    return vim_isfilec(c) && !vim_ispathsep(c);
+
+	case CTRL_X_CMDLINE:
+	case CTRL_X_OMNI:
+	    // Command line and Omni completion can work with just about any
+	    // printable character, but do stop at white space.
+	    return vim_isprintc(c) && !VIM_ISWHITE(c);
+
+	case CTRL_X_WHOLE_LINE:
+	    // For while line completion a space can be part of the line.
+	    return vim_isprintc(c);
+    }
+    return vim_iswordc(c);
+}
+
+/*
+ * This is like ins_compl_add(), but if 'ic' and 'inf' are set, then the
+ * case of the originally typed text is used, and the case of the completed
+ * text is inferred, ie this tries to work out what case you probably wanted
+ * the rest of the word to be in -- webb
+ */
+    int
+ins_compl_add_infercase(
+    char_u	*str,
+    int		len,
+    int		icase,
+    char_u	*fname,
+    int		dir,
+    int		flags)
+{
+    char_u	*p;
+    int		i, c;
+    int		actual_len;		// Take multi-byte characters
+    int		actual_compl_length;	// into account.
+    int		min_len;
+    int		*wca;			// Wide character array.
+    int		has_lower = FALSE;
+    int		was_letter = FALSE;
+
+    if (p_ic && curbuf->b_p_inf && len > 0)
+    {
+	// Infer case of completed part.
+
+	// Find actual length of completion.
+	if (has_mbyte)
+	{
+	    p = str;
+	    actual_len = 0;
+	    while (*p != NUL)
+	    {
+		MB_PTR_ADV(p);
+		++actual_len;
+	    }
+	}
+	else
+	    actual_len = len;
+
+	// Find actual length of original text.
+	if (has_mbyte)
+	{
+	    p = compl_orig_text;
+	    actual_compl_length = 0;
+	    while (*p != NUL)
+	    {
+		MB_PTR_ADV(p);
+		++actual_compl_length;
+	    }
+	}
+	else
+	    actual_compl_length = compl_length;
+
+	// "actual_len" may be smaller than "actual_compl_length" when using
+	// thesaurus, only use the minimum when comparing.
+	min_len = actual_len < actual_compl_length
+					   ? actual_len : actual_compl_length;
+
+	// Allocate wide character array for the completion and fill it.
+	wca = (int *)alloc((unsigned)(actual_len * sizeof(int)));
+	if (wca != NULL)
+	{
+	    p = str;
+	    for (i = 0; i < actual_len; ++i)
+		if (has_mbyte)
+		    wca[i] = mb_ptr2char_adv(&p);
+		else
+		    wca[i] = *(p++);
+
+	    // Rule 1: Were any chars converted to lower?
+	    p = compl_orig_text;
+	    for (i = 0; i < min_len; ++i)
+	    {
+		if (has_mbyte)
+		    c = mb_ptr2char_adv(&p);
+		else
+		    c = *(p++);
+		if (MB_ISLOWER(c))
+		{
+		    has_lower = TRUE;
+		    if (MB_ISUPPER(wca[i]))
+		    {
+			// Rule 1 is satisfied.
+			for (i = actual_compl_length; i < actual_len; ++i)
+			    wca[i] = MB_TOLOWER(wca[i]);
+			break;
+		    }
+		}
+	    }
+
+	    // Rule 2: No lower case, 2nd consecutive letter converted to
+	    // upper case.
+	    if (!has_lower)
+	    {
+		p = compl_orig_text;
+		for (i = 0; i < min_len; ++i)
+		{
+		    if (has_mbyte)
+			c = mb_ptr2char_adv(&p);
+		    else
+			c = *(p++);
+		    if (was_letter && MB_ISUPPER(c) && MB_ISLOWER(wca[i]))
+		    {
+			// Rule 2 is satisfied.
+			for (i = actual_compl_length; i < actual_len; ++i)
+			    wca[i] = MB_TOUPPER(wca[i]);
+			break;
+		    }
+		    was_letter = MB_ISLOWER(c) || MB_ISUPPER(c);
+		}
+	    }
+
+	    // Copy the original case of the part we typed.
+	    p = compl_orig_text;
+	    for (i = 0; i < min_len; ++i)
+	    {
+		if (has_mbyte)
+		    c = mb_ptr2char_adv(&p);
+		else
+		    c = *(p++);
+		if (MB_ISLOWER(c))
+		    wca[i] = MB_TOLOWER(wca[i]);
+		else if (MB_ISUPPER(c))
+		    wca[i] = MB_TOUPPER(wca[i]);
+	    }
+
+	    // Generate encoding specific output from wide character array.
+	    // Multi-byte characters can occupy up to five bytes more than
+	    // ASCII characters, and we also need one byte for NUL, so stay
+	    // six bytes away from the edge of IObuff.
+	    p = IObuff;
+	    i = 0;
+	    while (i < actual_len && (p - IObuff + 6) < IOSIZE)
+		if (has_mbyte)
+		    p += (*mb_char2bytes)(wca[i++], p);
+		else
+		    *(p++) = wca[i++];
+	    *p = NUL;
+
+	    vim_free(wca);
+	}
+
+	return ins_compl_add(IObuff, len, icase, fname, NULL, dir,
+								flags, FALSE);
+    }
+    return ins_compl_add(str, len, icase, fname, NULL, dir, flags, FALSE);
+}
+
+/*
+ * Add a match to the list of matches.
+ * If the given string is already in the list of completions, then return
+ * NOTDONE, otherwise add it to the list and return OK.  If there is an error,
+ * maybe because alloc() returns NULL, then FAIL is returned.
+ */
+    static int
+ins_compl_add(
+    char_u	*str,
+    int		len,
+    int		icase,
+    char_u	*fname,
+    char_u	**cptext,   // extra text for popup menu or NULL
+    int		cdir,
+    int		flags,
+    int		adup)	    // accept duplicate match
+{
+    compl_T	*match;
+    int		dir = (cdir == 0 ? compl_direction : cdir);
+
+    ui_breakcheck();
+    if (got_int)
+	return FAIL;
+    if (len < 0)
+	len = (int)STRLEN(str);
+
+    // If the same match is already present, don't add it.
+    if (compl_first_match != NULL && !adup)
+    {
+	match = compl_first_match;
+	do
+	{
+	    if (    !(match->cp_flags & ORIGINAL_TEXT)
+		    && STRNCMP(match->cp_str, str, len) == 0
+		    && match->cp_str[len] == NUL)
+		return NOTDONE;
+	    match = match->cp_next;
+	} while (match != NULL && match != compl_first_match);
+    }
+
+    // Remove any popup menu before changing the list of matches.
+    ins_compl_del_pum();
+
+    // Allocate a new match structure.
+    // Copy the values to the new match structure.
+    match = (compl_T *)alloc_clear((unsigned)sizeof(compl_T));
+    if (match == NULL)
+	return FAIL;
+    match->cp_number = -1;
+    if (flags & ORIGINAL_TEXT)
+	match->cp_number = 0;
+    if ((match->cp_str = vim_strnsave(str, len)) == NULL)
+    {
+	vim_free(match);
+	return FAIL;
+    }
+    match->cp_icase = icase;
+
+    // match-fname is:
+    // - compl_curr_match->cp_fname if it is a string equal to fname.
+    // - a copy of fname, FREE_FNAME is set to free later THE allocated mem.
+    // - NULL otherwise.	--Acevedo
+    if (fname != NULL
+	    && compl_curr_match != NULL
+	    && compl_curr_match->cp_fname != NULL
+	    && STRCMP(fname, compl_curr_match->cp_fname) == 0)
+	match->cp_fname = compl_curr_match->cp_fname;
+    else if (fname != NULL)
+    {
+	match->cp_fname = vim_strsave(fname);
+	flags |= FREE_FNAME;
+    }
+    else
+	match->cp_fname = NULL;
+    match->cp_flags = flags;
+
+    if (cptext != NULL)
+    {
+	int i;
+
+	for (i = 0; i < CPT_COUNT; ++i)
+	    if (cptext[i] != NULL && *cptext[i] != NUL)
+		match->cp_text[i] = vim_strsave(cptext[i]);
+    }
+
+    // Link the new match structure in the list of matches.
+    if (compl_first_match == NULL)
+	match->cp_next = match->cp_prev = NULL;
+    else if (dir == FORWARD)
+    {
+	match->cp_next = compl_curr_match->cp_next;
+	match->cp_prev = compl_curr_match;
+    }
+    else	// BACKWARD
+    {
+	match->cp_next = compl_curr_match;
+	match->cp_prev = compl_curr_match->cp_prev;
+    }
+    if (match->cp_next)
+	match->cp_next->cp_prev = match;
+    if (match->cp_prev)
+	match->cp_prev->cp_next = match;
+    else	// if there's nothing before, it is the first match
+	compl_first_match = match;
+    compl_curr_match = match;
+
+    // Find the longest common string if still doing that.
+    if (compl_get_longest && (flags & ORIGINAL_TEXT) == 0)
+	ins_compl_longest_match(match);
+
+    return OK;
+}
+
+/*
+ * Return TRUE if "str[len]" matches with match->cp_str, considering
+ * match->cp_icase.
+ */
+    static int
+ins_compl_equal(compl_T *match, char_u *str, int len)
+{
+    if (match->cp_icase)
+	return STRNICMP(match->cp_str, str, (size_t)len) == 0;
+    return STRNCMP(match->cp_str, str, (size_t)len) == 0;
+}
+
+/*
+ * Reduce the longest common string for match "match".
+ */
+    static void
+ins_compl_longest_match(compl_T *match)
+{
+    char_u	*p, *s;
+    int		c1, c2;
+    int		had_match;
+
+    if (compl_leader == NULL)
+    {
+	// First match, use it as a whole.
+	compl_leader = vim_strsave(match->cp_str);
+	if (compl_leader != NULL)
+	{
+	    had_match = (curwin->w_cursor.col > compl_col);
+	    ins_compl_delete();
+	    ins_bytes(compl_leader + ins_compl_len());
+	    ins_redraw(FALSE);
+
+	    // When the match isn't there (to avoid matching itself) remove it
+	    // again after redrawing.
+	    if (!had_match)
+		ins_compl_delete();
+	    compl_used_match = FALSE;
+	}
+    }
+    else
+    {
+	// Reduce the text if this match differs from compl_leader.
+	p = compl_leader;
+	s = match->cp_str;
+	while (*p != NUL)
+	{
+	    if (has_mbyte)
+	    {
+		c1 = mb_ptr2char(p);
+		c2 = mb_ptr2char(s);
+	    }
+	    else
+	    {
+		c1 = *p;
+		c2 = *s;
+	    }
+	    if (match->cp_icase ? (MB_TOLOWER(c1) != MB_TOLOWER(c2))
+								 : (c1 != c2))
+		break;
+	    if (has_mbyte)
+	    {
+		MB_PTR_ADV(p);
+		MB_PTR_ADV(s);
+	    }
+	    else
+	    {
+		++p;
+		++s;
+	    }
+	}
+
+	if (*p != NUL)
+	{
+	    // Leader was shortened, need to change the inserted text.
+	    *p = NUL;
+	    had_match = (curwin->w_cursor.col > compl_col);
+	    ins_compl_delete();
+	    ins_bytes(compl_leader + ins_compl_len());
+	    ins_redraw(FALSE);
+
+	    // When the match isn't there (to avoid matching itself) remove it
+	    // again after redrawing.
+	    if (!had_match)
+		ins_compl_delete();
+	}
+
+	compl_used_match = FALSE;
+    }
+}
+
+/*
+ * Add an array of matches to the list of matches.
+ * Frees matches[].
+ */
+    static void
+ins_compl_add_matches(
+    int		num_matches,
+    char_u	**matches,
+    int		icase)
+{
+    int		i;
+    int		add_r = OK;
+    int		dir = compl_direction;
+
+    for (i = 0; i < num_matches && add_r != FAIL; i++)
+	if ((add_r = ins_compl_add(matches[i], -1, icase,
+					    NULL, NULL, dir, 0, FALSE)) == OK)
+	    // if dir was BACKWARD then honor it just once
+	    dir = FORWARD;
+    FreeWild(num_matches, matches);
+}
+
+/*
+ * Make the completion list cyclic.
+ * Return the number of matches (excluding the original).
+ */
+    static int
+ins_compl_make_cyclic(void)
+{
+    compl_T *match;
+    int	    count = 0;
+
+    if (compl_first_match != NULL)
+    {
+	// Find the end of the list.
+	match = compl_first_match;
+	// there's always an entry for the compl_orig_text, it doesn't count.
+	while (match->cp_next != NULL && match->cp_next != compl_first_match)
+	{
+	    match = match->cp_next;
+	    ++count;
+	}
+	match->cp_next = compl_first_match;
+	compl_first_match->cp_prev = match;
+    }
+    return count;
+}
+
+/*
+ * Return whether there currently is a shown match.
+ */
+    int
+ins_compl_has_shown_match(void)
+{
+    return compl_shown_match == NULL
+	|| compl_shown_match != compl_shown_match->cp_next;
+}
+
+/*
+ * Return whether the shown match is long enough.
+ */
+    int
+ins_compl_long_shown_match(void)
+{
+    return (int)STRLEN(compl_shown_match->cp_str)
+					    > curwin->w_cursor.col - compl_col;
+}
+
+/*
+ * Set variables that store noselect and noinsert behavior from the
+ * 'completeopt' value.
+ */
+    void
+completeopt_was_set(void)
+{
+    compl_no_insert = FALSE;
+    compl_no_select = FALSE;
+    if (strstr((char *)p_cot, "noselect") != NULL)
+	compl_no_select = TRUE;
+    if (strstr((char *)p_cot, "noinsert") != NULL)
+	compl_no_insert = TRUE;
+}
+
+/*
+ * Start completion for the complete() function.
+ * "startcol" is where the matched text starts (1 is first column).
+ * "list" is the list of matches.
+ */
+    void
+set_completion(colnr_T startcol, list_T *list)
+{
+    int save_w_wrow = curwin->w_wrow;
+    int save_w_leftcol = curwin->w_leftcol;
+
+    // If already doing completions stop it.
+    if (ctrl_x_mode != CTRL_X_NORMAL)
+	ins_compl_prep(' ');
+    ins_compl_clear();
+    ins_compl_free();
+
+    compl_direction = FORWARD;
+    if (startcol > curwin->w_cursor.col)
+	startcol = curwin->w_cursor.col;
+    compl_col = startcol;
+    compl_length = (int)curwin->w_cursor.col - (int)startcol;
+    // compl_pattern doesn't need to be set
+    compl_orig_text = vim_strnsave(ml_get_curline() + compl_col, compl_length);
+    if (compl_orig_text == NULL || ins_compl_add(compl_orig_text,
+			-1, p_ic, NULL, NULL, 0, ORIGINAL_TEXT, FALSE) != OK)
+	return;
+
+    ctrl_x_mode = CTRL_X_EVAL;
+
+    ins_compl_add_list(list);
+    compl_matches = ins_compl_make_cyclic();
+    compl_started = TRUE;
+    compl_used_match = TRUE;
+    compl_cont_status = 0;
+
+    compl_curr_match = compl_first_match;
+    if (compl_no_insert || compl_no_select)
+    {
+	ins_complete(K_DOWN, FALSE);
+	if (compl_no_select)
+	    // Down/Up has no real effect.
+	    ins_complete(K_UP, FALSE);
+    }
+    else
+	ins_complete(Ctrl_N, FALSE);
+    compl_enter_selects = compl_no_insert;
+
+    // Lazily show the popup menu, unless we got interrupted.
+    if (!compl_interrupted)
+	show_pum(save_w_wrow, save_w_leftcol);
+    out_flush();
+}
+
+
+// "compl_match_array" points the currently displayed list of entries in the
+// popup menu.  It is NULL when there is no popup menu.
+static pumitem_T *compl_match_array = NULL;
+static int compl_match_arraysize;
+
+/*
+ * Update the screen and when there is any scrolling remove the popup menu.
+ */
+    static void
+ins_compl_upd_pum(void)
+{
+    int		h;
+
+    if (compl_match_array != NULL)
+    {
+	h = curwin->w_cline_height;
+	// Update the screen later, before drawing the popup menu over it.
+	pum_call_update_screen();
+	if (h != curwin->w_cline_height)
+	    ins_compl_del_pum();
+    }
+}
+
+/*
+ * Remove any popup menu.
+ */
+    static void
+ins_compl_del_pum(void)
+{
+    if (compl_match_array != NULL)
+    {
+	pum_undisplay();
+	VIM_CLEAR(compl_match_array);
+    }
+}
+
+/*
+ * Return TRUE if the popup menu should be displayed.
+ */
+    int
+pum_wanted(void)
+{
+    // 'completeopt' must contain "menu" or "menuone"
+    if (vim_strchr(p_cot, 'm') == NULL)
+	return FALSE;
+
+    // The display looks bad on a B&W display.
+    if (t_colors < 8
+#ifdef FEAT_GUI
+	    && !gui.in_use
+#endif
+	    )
+	return FALSE;
+    return TRUE;
+}
+
+/*
+ * Return TRUE if there are two or more matches to be shown in the popup menu.
+ * One if 'completopt' contains "menuone".
+ */
+    static int
+pum_enough_matches(void)
+{
+    compl_T     *compl;
+    int		i;
+
+    // Don't display the popup menu if there are no matches or there is only
+    // one (ignoring the original text).
+    compl = compl_first_match;
+    i = 0;
+    do
+    {
+	if (compl == NULL
+		      || ((compl->cp_flags & ORIGINAL_TEXT) == 0 && ++i == 2))
+	    break;
+	compl = compl->cp_next;
+    } while (compl != compl_first_match);
+
+    if (strstr((char *)p_cot, "menuone") != NULL)
+	return (i >= 1);
+    return (i >= 2);
+}
+
+/*
+ * Show the popup menu for the list of matches.
+ * Also adjusts "compl_shown_match" to an entry that is actually displayed.
+ */
+    void
+ins_compl_show_pum(void)
+{
+    compl_T     *compl;
+    compl_T     *shown_compl = NULL;
+    int		did_find_shown_match = FALSE;
+    int		shown_match_ok = FALSE;
+    int		i;
+    int		cur = -1;
+    colnr_T	col;
+    int		lead_len = 0;
+
+    if (!pum_wanted() || !pum_enough_matches())
+	return;
+
+#if defined(FEAT_EVAL)
+    // Dirty hard-coded hack: remove any matchparen highlighting.
+    do_cmdline_cmd((char_u *)"if exists('g:loaded_matchparen')|3match none|endif");
+#endif
+
+    // Update the screen later, before drawing the popup menu over it.
+    pum_call_update_screen();
+
+    if (compl_match_array == NULL)
+    {
+	// Need to build the popup menu list.
+	compl_match_arraysize = 0;
+	compl = compl_first_match;
+	if (compl_leader != NULL)
+	    lead_len = (int)STRLEN(compl_leader);
+	do
+	{
+	    if ((compl->cp_flags & ORIGINAL_TEXT) == 0
+		    && (compl_leader == NULL
+			|| ins_compl_equal(compl, compl_leader, lead_len)))
+		++compl_match_arraysize;
+	    compl = compl->cp_next;
+	} while (compl != NULL && compl != compl_first_match);
+	if (compl_match_arraysize == 0)
+	    return;
+	compl_match_array = (pumitem_T *)alloc_clear(
+				    (unsigned)(sizeof(pumitem_T)
+						    * compl_match_arraysize));
+	if (compl_match_array != NULL)
+	{
+	    // If the current match is the original text don't find the first
+	    // match after it, don't highlight anything.
+	    if (compl_shown_match->cp_flags & ORIGINAL_TEXT)
+		shown_match_ok = TRUE;
+
+	    i = 0;
+	    compl = compl_first_match;
+	    do
+	    {
+		if ((compl->cp_flags & ORIGINAL_TEXT) == 0
+			&& (compl_leader == NULL
+			    || ins_compl_equal(compl, compl_leader, lead_len)))
+		{
+		    if (!shown_match_ok)
+		    {
+			if (compl == compl_shown_match || did_find_shown_match)
+			{
+			    // This item is the shown match or this is the
+			    // first displayed item after the shown match.
+			    compl_shown_match = compl;
+			    did_find_shown_match = TRUE;
+			    shown_match_ok = TRUE;
+			}
+			else
+			    // Remember this displayed match for when the
+			    // shown match is just below it.
+			    shown_compl = compl;
+			cur = i;
+		    }
+
+		    if (compl->cp_text[CPT_ABBR] != NULL)
+			compl_match_array[i].pum_text =
+						     compl->cp_text[CPT_ABBR];
+		    else
+			compl_match_array[i].pum_text = compl->cp_str;
+		    compl_match_array[i].pum_kind = compl->cp_text[CPT_KIND];
+		    compl_match_array[i].pum_info = compl->cp_text[CPT_INFO];
+		    if (compl->cp_text[CPT_MENU] != NULL)
+			compl_match_array[i++].pum_extra =
+						     compl->cp_text[CPT_MENU];
+		    else
+			compl_match_array[i++].pum_extra = compl->cp_fname;
+		}
+
+		if (compl == compl_shown_match)
+		{
+		    did_find_shown_match = TRUE;
+
+		    // When the original text is the shown match don't set
+		    // compl_shown_match.
+		    if (compl->cp_flags & ORIGINAL_TEXT)
+			shown_match_ok = TRUE;
+
+		    if (!shown_match_ok && shown_compl != NULL)
+		    {
+			// The shown match isn't displayed, set it to the
+			// previously displayed match.
+			compl_shown_match = shown_compl;
+			shown_match_ok = TRUE;
+		    }
+		}
+		compl = compl->cp_next;
+	    } while (compl != NULL && compl != compl_first_match);
+
+	    if (!shown_match_ok)    // no displayed match at all
+		cur = -1;
+	}
+    }
+    else
+    {
+	// popup menu already exists, only need to find the current item.
+	for (i = 0; i < compl_match_arraysize; ++i)
+	    if (compl_match_array[i].pum_text == compl_shown_match->cp_str
+		    || compl_match_array[i].pum_text
+				      == compl_shown_match->cp_text[CPT_ABBR])
+	    {
+		cur = i;
+		break;
+	    }
+    }
+
+    if (compl_match_array != NULL)
+    {
+	// In Replace mode when a $ is displayed at the end of the line only
+	// part of the screen would be updated.  We do need to redraw here.
+	dollar_vcol = -1;
+
+	// Compute the screen column of the start of the completed text.
+	// Use the cursor to get all wrapping and other settings right.
+	col = curwin->w_cursor.col;
+	curwin->w_cursor.col = compl_col;
+	pum_display(compl_match_array, compl_match_arraysize, cur);
+	curwin->w_cursor.col = col;
+    }
+}
+
+#define DICT_FIRST	(1)	// use just first element in "dict"
+#define DICT_EXACT	(2)	// "dict" is the exact name of a file
+
+/*
+ * Add any identifiers that match the given pattern in the list of dictionary
+ * files "dict_start" to the list of completions.
+ */
+    static void
+ins_compl_dictionaries(
+    char_u	*dict_start,
+    char_u	*pat,
+    int		flags,		// DICT_FIRST and/or DICT_EXACT
+    int		thesaurus)	// Thesaurus completion
+{
+    char_u	*dict = dict_start;
+    char_u	*ptr;
+    char_u	*buf;
+    regmatch_T	regmatch;
+    char_u	**files;
+    int		count;
+    int		save_p_scs;
+    int		dir = compl_direction;
+
+    if (*dict == NUL)
+    {
+#ifdef FEAT_SPELL
+	// When 'dictionary' is empty and spell checking is enabled use
+	// "spell".
+	if (!thesaurus && curwin->w_p_spell)
+	    dict = (char_u *)"spell";
+	else
+#endif
+	    return;
+    }
+
+    buf = alloc(LSIZE);
+    if (buf == NULL)
+	return;
+    regmatch.regprog = NULL;	// so that we can goto theend
+
+    // If 'infercase' is set, don't use 'smartcase' here
+    save_p_scs = p_scs;
+    if (curbuf->b_p_inf)
+	p_scs = FALSE;
+
+    // When invoked to match whole lines for CTRL-X CTRL-L adjust the pattern
+    // to only match at the start of a line.  Otherwise just match the
+    // pattern. Also need to double backslashes.
+    if (ctrl_x_mode_line_or_eval())
+    {
+	char_u *pat_esc = vim_strsave_escaped(pat, (char_u *)"\\");
+	size_t len;
+
+	if (pat_esc == NULL)
+	    goto theend;
+	len = STRLEN(pat_esc) + 10;
+	ptr = alloc((unsigned)len);
+	if (ptr == NULL)
+	{
+	    vim_free(pat_esc);
+	    goto theend;
+	}
+	vim_snprintf((char *)ptr, len, "^\\s*\\zs\\V%s", pat_esc);
+	regmatch.regprog = vim_regcomp(ptr, RE_MAGIC);
+	vim_free(pat_esc);
+	vim_free(ptr);
+    }
+    else
+    {
+	regmatch.regprog = vim_regcomp(pat, p_magic ? RE_MAGIC : 0);
+	if (regmatch.regprog == NULL)
+	    goto theend;
+    }
+
+    // ignore case depends on 'ignorecase', 'smartcase' and "pat"
+    regmatch.rm_ic = ignorecase(pat);
+    while (*dict != NUL && !got_int && !compl_interrupted)
+    {
+	// copy one dictionary file name into buf
+	if (flags == DICT_EXACT)
+	{
+	    count = 1;
+	    files = &dict;
+	}
+	else
+	{
+	    // Expand wildcards in the dictionary name, but do not allow
+	    // backticks (for security, the 'dict' option may have been set in
+	    // a modeline).
+	    copy_option_part(&dict, buf, LSIZE, ",");
+# ifdef FEAT_SPELL
+	    if (!thesaurus && STRCMP(buf, "spell") == 0)
+		count = -1;
+	    else
+# endif
+		if (vim_strchr(buf, '`') != NULL
+		    || expand_wildcards(1, &buf, &count, &files,
+						     EW_FILE|EW_SILENT) != OK)
+		count = 0;
+	}
+
+# ifdef FEAT_SPELL
+	if (count == -1)
+	{
+	    // Complete from active spelling.  Skip "\<" in the pattern, we
+	    // don't use it as a RE.
+	    if (pat[0] == '\\' && pat[1] == '<')
+		ptr = pat + 2;
+	    else
+		ptr = pat;
+	    spell_dump_compl(ptr, regmatch.rm_ic, &dir, 0);
+	}
+	else
+# endif
+	    if (count > 0)	// avoid warning for using "files" uninit
+	{
+	    ins_compl_files(count, files, thesaurus, flags,
+							&regmatch, buf, &dir);
+	    if (flags != DICT_EXACT)
+		FreeWild(count, files);
+	}
+	if (flags != 0)
+	    break;
+    }
+
+theend:
+    p_scs = save_p_scs;
+    vim_regfree(regmatch.regprog);
+    vim_free(buf);
+}
+
+    static void
+ins_compl_files(
+    int		count,
+    char_u	**files,
+    int		thesaurus,
+    int		flags,
+    regmatch_T	*regmatch,
+    char_u	*buf,
+    int		*dir)
+{
+    char_u	*ptr;
+    int		i;
+    FILE	*fp;
+    int		add_r;
+
+    for (i = 0; i < count && !got_int && !compl_interrupted; i++)
+    {
+	fp = mch_fopen((char *)files[i], "r");  // open dictionary file
+	if (flags != DICT_EXACT)
+	{
+	    vim_snprintf((char *)IObuff, IOSIZE,
+			      _("Scanning dictionary: %s"), (char *)files[i]);
+	    (void)msg_trunc_attr((char *)IObuff, TRUE, HL_ATTR(HLF_R));
+	}
+
+	if (fp != NULL)
+	{
+	    // Read dictionary file line by line.
+	    // Check each line for a match.
+	    while (!got_int && !compl_interrupted
+					    && !vim_fgets(buf, LSIZE, fp))
+	    {
+		ptr = buf;
+		while (vim_regexec(regmatch, buf, (colnr_T)(ptr - buf)))
+		{
+		    ptr = regmatch->startp[0];
+		    if (ctrl_x_mode_line_or_eval())
+			ptr = find_line_end(ptr);
+		    else
+			ptr = find_word_end(ptr);
+		    add_r = ins_compl_add_infercase(regmatch->startp[0],
+					  (int)(ptr - regmatch->startp[0]),
+						     p_ic, files[i], *dir, 0);
+		    if (thesaurus)
+		    {
+			char_u *wstart;
+
+			// Add the other matches on the line
+			ptr = buf;
+			while (!got_int)
+			{
+			    // Find start of the next word.  Skip white
+			    // space and punctuation.
+			    ptr = find_word_start(ptr);
+			    if (*ptr == NUL || *ptr == NL)
+				break;
+			    wstart = ptr;
+
+			    // Find end of the word.
+			    if (has_mbyte)
+				// Japanese words may have characters in
+				// different classes, only separate words
+				// with single-byte non-word characters.
+				while (*ptr != NUL)
+				{
+				    int l = (*mb_ptr2len)(ptr);
+
+				    if (l < 2 && !vim_iswordc(*ptr))
+					break;
+				    ptr += l;
+				}
+			    else
+				ptr = find_word_end(ptr);
+
+			    // Add the word. Skip the regexp match.
+			    if (wstart != regmatch->startp[0])
+				add_r = ins_compl_add_infercase(wstart,
+					(int)(ptr - wstart),
+					p_ic, files[i], *dir, 0);
+			}
+		    }
+		    if (add_r == OK)
+			// if dir was BACKWARD then honor it just once
+			*dir = FORWARD;
+		    else if (add_r == FAIL)
+			break;
+		    // avoid expensive call to vim_regexec() when at end
+		    // of line
+		    if (*ptr == '\n' || got_int)
+			break;
+		}
+		line_breakcheck();
+		ins_compl_check_keys(50, FALSE);
+	    }
+	    fclose(fp);
+	}
+    }
+}
+
+/*
+ * Find the start of the next word.
+ * Returns a pointer to the first char of the word.  Also stops at a NUL.
+ */
+    char_u *
+find_word_start(char_u *ptr)
+{
+    if (has_mbyte)
+	while (*ptr != NUL && *ptr != '\n' && mb_get_class(ptr) <= 1)
+	    ptr += (*mb_ptr2len)(ptr);
+    else
+	while (*ptr != NUL && *ptr != '\n' && !vim_iswordc(*ptr))
+	    ++ptr;
+    return ptr;
+}
+
+/*
+ * Find the end of the word.  Assumes it starts inside a word.
+ * Returns a pointer to just after the word.
+ */
+    char_u *
+find_word_end(char_u *ptr)
+{
+    int		start_class;
+
+    if (has_mbyte)
+    {
+	start_class = mb_get_class(ptr);
+	if (start_class > 1)
+	    while (*ptr != NUL)
+	    {
+		ptr += (*mb_ptr2len)(ptr);
+		if (mb_get_class(ptr) != start_class)
+		    break;
+	    }
+    }
+    else
+	while (vim_iswordc(*ptr))
+	    ++ptr;
+    return ptr;
+}
+
+/*
+ * Find the end of the line, omitting CR and NL at the end.
+ * Returns a pointer to just after the line.
+ */
+    static char_u *
+find_line_end(char_u *ptr)
+{
+    char_u	*s;
+
+    s = ptr + STRLEN(ptr);
+    while (s > ptr && (s[-1] == CAR || s[-1] == NL))
+	--s;
+    return s;
+}
+
+/*
+ * Free the list of completions
+ */
+    static void
+ins_compl_free(void)
+{
+    compl_T *match;
+    int	    i;
+
+    VIM_CLEAR(compl_pattern);
+    VIM_CLEAR(compl_leader);
+
+    if (compl_first_match == NULL)
+	return;
+
+    ins_compl_del_pum();
+    pum_clear();
+
+    compl_curr_match = compl_first_match;
+    do
+    {
+	match = compl_curr_match;
+	compl_curr_match = compl_curr_match->cp_next;
+	vim_free(match->cp_str);
+	// several entries may use the same fname, free it just once.
+	if (match->cp_flags & FREE_FNAME)
+	    vim_free(match->cp_fname);
+	for (i = 0; i < CPT_COUNT; ++i)
+	    vim_free(match->cp_text[i]);
+	vim_free(match);
+    } while (compl_curr_match != NULL && compl_curr_match != compl_first_match);
+    compl_first_match = compl_curr_match = NULL;
+    compl_shown_match = NULL;
+    compl_old_match = NULL;
+}
+
+    void
+ins_compl_clear(void)
+{
+    compl_cont_status = 0;
+    compl_started = FALSE;
+    compl_matches = 0;
+    VIM_CLEAR(compl_pattern);
+    VIM_CLEAR(compl_leader);
+    edit_submode_extra = NULL;
+    VIM_CLEAR(compl_orig_text);
+    compl_enter_selects = FALSE;
+    // clear v:completed_item
+    set_vim_var_dict(VV_COMPLETED_ITEM, dict_alloc_lock(VAR_FIXED));
+}
+
+/*
+ * Return TRUE when Insert completion is active.
+ */
+    int
+ins_compl_active(void)
+{
+    return compl_started;
+}
+
+/*
+ * Get complete information
+ */
+    void
+get_complete_info(list_T *what_list, dict_T *retdict)
+{
+    int		ret = OK;
+    listitem_T	*item;
+#define CI_WHAT_MODE		0x01
+#define CI_WHAT_PUM_VISIBLE	0x02
+#define CI_WHAT_ITEMS		0x04
+#define CI_WHAT_SELECTED	0x08
+#define CI_WHAT_INSERTED	0x10
+#define CI_WHAT_ALL		0xff
+    int		what_flag;
+
+    if (what_list == NULL)
+	what_flag = CI_WHAT_ALL;
+    else
+    {
+	what_flag = 0;
+	for (item = what_list->lv_first; item != NULL; item = item->li_next)
+	{
+	    char_u *what = tv_get_string(&item->li_tv);
+
+	    if (STRCMP(what, "mode") == 0)
+		what_flag |= CI_WHAT_MODE;
+	    else if (STRCMP(what, "pum_visible") == 0)
+		what_flag |= CI_WHAT_PUM_VISIBLE;
+	    else if (STRCMP(what, "items") == 0)
+		what_flag |= CI_WHAT_ITEMS;
+	    else if (STRCMP(what, "selected") == 0)
+		what_flag |= CI_WHAT_SELECTED;
+	    else if (STRCMP(what, "inserted") == 0)
+		what_flag |= CI_WHAT_INSERTED;
+	}
+    }
+
+    if (ret == OK && (what_flag & CI_WHAT_MODE))
+	ret = dict_add_string(retdict, "mode", ins_compl_mode());
+
+    if (ret == OK && (what_flag & CI_WHAT_PUM_VISIBLE))
+	ret = dict_add_number(retdict, "pum_visible", pum_visible());
+
+    if (ret == OK && (what_flag & CI_WHAT_ITEMS))
+    {
+	list_T	    *li;
+	dict_T	    *di;
+	compl_T     *match;
+
+	li = list_alloc();
+	if (li == NULL)
+	    return;
+	ret = dict_add_list(retdict, "items", li);
+	if (ret == OK && compl_first_match != NULL)
+	{
+	    match = compl_first_match;
+	    do
+	    {
+		if (!(match->cp_flags & ORIGINAL_TEXT))
+		{
+		    di = dict_alloc();
+		    if (di == NULL)
+			return;
+		    ret = list_append_dict(li, di);
+		    if (ret != OK)
+			return;
+		    dict_add_string(di, "word", match->cp_str);
+		    dict_add_string(di, "abbr", match->cp_text[CPT_ABBR]);
+		    dict_add_string(di, "menu", match->cp_text[CPT_MENU]);
+		    dict_add_string(di, "kind", match->cp_text[CPT_KIND]);
+		    dict_add_string(di, "info", match->cp_text[CPT_INFO]);
+		    dict_add_string(di, "user_data",
+					    match->cp_text[CPT_USER_DATA]);
+		}
+		match = match->cp_next;
+	    }
+	    while (match != NULL && match != compl_first_match);
+	}
+    }
+
+    if (ret == OK && (what_flag & CI_WHAT_SELECTED))
+	ret = dict_add_number(retdict, "selected", (compl_curr_match != NULL) ?
+			compl_curr_match->cp_number - 1 : -1);
+
+    // TODO
+    // if (ret == OK && (what_flag & CI_WHAT_INSERTED))
+}
+
+/*
+ * Return Insert completion mode name string
+ */
+    static char_u *
+ins_compl_mode(void)
+{
+    if (ctrl_x_mode == CTRL_X_NOT_DEFINED_YET || compl_started)
+	return (char_u *)ctrl_x_mode_names[ctrl_x_mode & ~CTRL_X_WANT_IDENT];
+
+    return (char_u *)"";
+}
+
+/*
+ * Selected one of the matches.  When FALSE the match was edited or using the
+ * longest common string.
+ */
+    int
+ins_compl_used_match(void)
+{
+    return compl_used_match;
+}
+
+/*
+ * Initialize get longest common string.
+ */
+    void
+ins_compl_init_get_longest(void)
+{
+    compl_get_longest = FALSE;
+}
+
+/*
+ * Returns TRUE when insert completion is interrupted.
+ */
+    int
+ins_compl_interrupted(void)
+{
+    return compl_interrupted;
+}
+
+/*
+ * Returns TRUE if the <Enter> key selects a match in the completion popup
+ * menu.
+ */
+    int
+ins_compl_enter_selects(void)
+{
+    return compl_enter_selects;
+}
+
+/*
+ * Return the column where the text starts that is being completed
+ */
+    colnr_T
+ins_compl_col(void)
+{
+    return compl_col;
+}
+
+/*
+ * Delete one character before the cursor and show the subset of the matches
+ * that match the word that is now before the cursor.
+ * Returns the character to be used, NUL if the work is done and another char
+ * to be got from the user.
+ */
+    int
+ins_compl_bs(void)
+{
+    char_u	*line;
+    char_u	*p;
+
+    line = ml_get_curline();
+    p = line + curwin->w_cursor.col;
+    MB_PTR_BACK(line, p);
+
+    // Stop completion when the whole word was deleted.  For Omni completion
+    // allow the word to be deleted, we won't match everything.
+    // Respect the 'backspace' option.
+    if ((int)(p - line) - (int)compl_col < 0
+	    || ((int)(p - line) - (int)compl_col == 0
+		&& ctrl_x_mode != CTRL_X_OMNI) || ctrl_x_mode == CTRL_X_EVAL
+	    || (!can_bs(BS_START) && (int)(p - line) - (int)compl_col
+							- compl_length < 0))
+	return K_BS;
+
+    // Deleted more than what was used to find matches or didn't finish
+    // finding all matches: need to look for matches all over again.
+    if (curwin->w_cursor.col <= compl_col + compl_length
+						  || ins_compl_need_restart())
+	ins_compl_restart();
+
+    vim_free(compl_leader);
+    compl_leader = vim_strnsave(line + compl_col, (int)(p - line) - compl_col);
+    if (compl_leader != NULL)
+    {
+	ins_compl_new_leader();
+	if (compl_shown_match != NULL)
+	    // Make sure current match is not a hidden item.
+	    compl_curr_match = compl_shown_match;
+	return NUL;
+    }
+    return K_BS;
+}
+
+/*
+ * Return TRUE when we need to find matches again, ins_compl_restart() is to
+ * be called.
+ */
+    static int
+ins_compl_need_restart(void)
+{
+    // Return TRUE if we didn't complete finding matches or when the
+    // 'completefunc' returned "always" in the "refresh" dictionary item.
+    return compl_was_interrupted
+	|| ((ctrl_x_mode == CTRL_X_FUNCTION || ctrl_x_mode == CTRL_X_OMNI)
+						  && compl_opt_refresh_always);
+}
+
+/*
+ * Called after changing "compl_leader".
+ * Show the popup menu with a different set of matches.
+ * May also search for matches again if the previous search was interrupted.
+ */
+    static void
+ins_compl_new_leader(void)
+{
+    ins_compl_del_pum();
+    ins_compl_delete();
+    ins_bytes(compl_leader + ins_compl_len());
+    compl_used_match = FALSE;
+
+    if (compl_started)
+	ins_compl_set_original_text(compl_leader);
+    else
+    {
+#ifdef FEAT_SPELL
+	spell_bad_len = 0;	// need to redetect bad word
+#endif
+	// Matches were cleared, need to search for them now.  Befor drawing
+	// the popup menu display the changed text before the cursor.  Set
+	// "compl_restarting" to avoid that the first match is inserted.
+	pum_call_update_screen();
+#ifdef FEAT_GUI
+	if (gui.in_use)
+	{
+	    // Show the cursor after the match, not after the redrawn text.
+	    setcursor();
+	    out_flush_cursor(FALSE, FALSE);
+	}
+#endif
+	compl_restarting = TRUE;
+	if (ins_complete(Ctrl_N, TRUE) == FAIL)
+	    compl_cont_status = 0;
+	compl_restarting = FALSE;
+    }
+
+    compl_enter_selects = !compl_used_match;
+
+    // Show the popup menu with a different set of matches.
+    ins_compl_show_pum();
+
+    // Don't let Enter select the original text when there is no popup menu.
+    if (compl_match_array == NULL)
+	compl_enter_selects = FALSE;
+}
+
+/*
+ * Return the length of the completion, from the completion start column to
+ * the cursor column.  Making sure it never goes below zero.
+ */
+    static int
+ins_compl_len(void)
+{
+    int off = (int)curwin->w_cursor.col - (int)compl_col;
+
+    if (off < 0)
+	return 0;
+    return off;
+}
+
+/*
+ * Append one character to the match leader.  May reduce the number of
+ * matches.
+ */
+    void
+ins_compl_addleader(int c)
+{
+    int		cc;
+
+    if (stop_arrow() == FAIL)
+	return;
+    if (has_mbyte && (cc = (*mb_char2len)(c)) > 1)
+    {
+	char_u	buf[MB_MAXBYTES + 1];
+
+	(*mb_char2bytes)(c, buf);
+	buf[cc] = NUL;
+	ins_char_bytes(buf, cc);
+	if (compl_opt_refresh_always)
+	    AppendToRedobuff(buf);
+    }
+    else
+    {
+	ins_char(c);
+	if (compl_opt_refresh_always)
+	    AppendCharToRedobuff(c);
+    }
+
+    // If we didn't complete finding matches we must search again.
+    if (ins_compl_need_restart())
+	ins_compl_restart();
+
+    // When 'always' is set, don't reset compl_leader. While completing,
+    // cursor doesn't point original position, changing compl_leader would
+    // break redo.
+    if (!compl_opt_refresh_always)
+    {
+	vim_free(compl_leader);
+	compl_leader = vim_strnsave(ml_get_curline() + compl_col,
+				     (int)(curwin->w_cursor.col - compl_col));
+	if (compl_leader != NULL)
+	    ins_compl_new_leader();
+    }
+}
+
+/*
+ * Setup for finding completions again without leaving CTRL-X mode.  Used when
+ * BS or a key was typed while still searching for matches.
+ */
+    static void
+ins_compl_restart(void)
+{
+    ins_compl_free();
+    compl_started = FALSE;
+    compl_matches = 0;
+    compl_cont_status = 0;
+    compl_cont_mode = 0;
+}
+
+/*
+ * Set the first match, the original text.
+ */
+    static void
+ins_compl_set_original_text(char_u *str)
+{
+    char_u	*p;
+
+    // Replace the original text entry.
+    // The ORIGINAL_TEXT flag is either at the first item or might possibly be
+    // at the last item for backward completion
+    if (compl_first_match->cp_flags & ORIGINAL_TEXT)	// safety check
+    {
+	p = vim_strsave(str);
+	if (p != NULL)
+	{
+	    vim_free(compl_first_match->cp_str);
+	    compl_first_match->cp_str = p;
+	}
+    }
+    else if (compl_first_match->cp_prev != NULL
+	    && (compl_first_match->cp_prev->cp_flags & ORIGINAL_TEXT))
+    {
+       p = vim_strsave(str);
+       if (p != NULL)
+       {
+           vim_free(compl_first_match->cp_prev->cp_str);
+           compl_first_match->cp_prev->cp_str = p;
+       }
+    }
+}
+
+/*
+ * Append one character to the match leader.  May reduce the number of
+ * matches.
+ */
+    void
+ins_compl_addfrommatch(void)
+{
+    char_u	*p;
+    int		len = (int)curwin->w_cursor.col - (int)compl_col;
+    int		c;
+    compl_T	*cp;
+
+    p = compl_shown_match->cp_str;
+    if ((int)STRLEN(p) <= len)   // the match is too short
+    {
+	// When still at the original match use the first entry that matches
+	// the leader.
+	if (compl_shown_match->cp_flags & ORIGINAL_TEXT)
+	{
+	    p = NULL;
+	    for (cp = compl_shown_match->cp_next; cp != NULL
+				 && cp != compl_first_match; cp = cp->cp_next)
+	    {
+		if (compl_leader == NULL
+			|| ins_compl_equal(cp, compl_leader,
+						   (int)STRLEN(compl_leader)))
+		{
+		    p = cp->cp_str;
+		    break;
+		}
+	    }
+	    if (p == NULL || (int)STRLEN(p) <= len)
+		return;
+	}
+	else
+	    return;
+    }
+    p += len;
+    c = PTR2CHAR(p);
+    ins_compl_addleader(c);
+}
+
+/*
+ * Prepare for Insert mode completion, or stop it.
+ * Called just after typing a character in Insert mode.
+ * Returns TRUE when the character is not to be inserted;
+ */
+    int
+ins_compl_prep(int c)
+{
+    char_u	*ptr;
+    int		want_cindent;
+    int		retval = FALSE;
+
+    // Forget any previous 'special' messages if this is actually
+    // a ^X mode key - bar ^R, in which case we wait to see what it gives us.
+    if (c != Ctrl_R && vim_is_ctrl_x_key(c))
+	edit_submode_extra = NULL;
+
+    // Ignore end of Select mode mapping and mouse scroll buttons.
+    if (c == K_SELECT || c == K_MOUSEDOWN || c == K_MOUSEUP
+	    || c == K_MOUSELEFT || c == K_MOUSERIGHT)
+	return retval;
+
+    // Set "compl_get_longest" when finding the first matches.
+    if (ctrl_x_mode == CTRL_X_NOT_DEFINED_YET
+			   || (ctrl_x_mode == CTRL_X_NORMAL && !compl_started))
+    {
+	compl_get_longest = (strstr((char *)p_cot, "longest") != NULL);
+	compl_used_match = TRUE;
+
+    }
+
+    if (ctrl_x_mode == CTRL_X_NOT_DEFINED_YET)
+    {
+	// We have just typed CTRL-X and aren't quite sure which CTRL-X mode
+	// it will be yet.  Now we decide.
+	switch (c)
+	{
+	    case Ctrl_E:
+	    case Ctrl_Y:
+		ctrl_x_mode = CTRL_X_SCROLL;
+		if (!(State & REPLACE_FLAG))
+		    edit_submode = (char_u *)_(" (insert) Scroll (^E/^Y)");
+		else
+		    edit_submode = (char_u *)_(" (replace) Scroll (^E/^Y)");
+		edit_submode_pre = NULL;
+		showmode();
+		break;
+	    case Ctrl_L:
+		ctrl_x_mode = CTRL_X_WHOLE_LINE;
+		break;
+	    case Ctrl_F:
+		ctrl_x_mode = CTRL_X_FILES;
+		break;
+	    case Ctrl_K:
+		ctrl_x_mode = CTRL_X_DICTIONARY;
+		break;
+	    case Ctrl_R:
+		// Simply allow ^R to happen without affecting ^X mode
+		break;
+	    case Ctrl_T:
+		ctrl_x_mode = CTRL_X_THESAURUS;
+		break;
+#ifdef FEAT_COMPL_FUNC
+	    case Ctrl_U:
+		ctrl_x_mode = CTRL_X_FUNCTION;
+		break;
+	    case Ctrl_O:
+		ctrl_x_mode = CTRL_X_OMNI;
+		break;
+#endif
+	    case 's':
+	    case Ctrl_S:
+		ctrl_x_mode = CTRL_X_SPELL;
+#ifdef FEAT_SPELL
+		++emsg_off;	// Avoid getting the E756 error twice.
+		spell_back_to_badword();
+		--emsg_off;
+#endif
+		break;
+	    case Ctrl_RSB:
+		ctrl_x_mode = CTRL_X_TAGS;
+		break;
+#ifdef FEAT_FIND_ID
+	    case Ctrl_I:
+	    case K_S_TAB:
+		ctrl_x_mode = CTRL_X_PATH_PATTERNS;
+		break;
+	    case Ctrl_D:
+		ctrl_x_mode = CTRL_X_PATH_DEFINES;
+		break;
+#endif
+	    case Ctrl_V:
+	    case Ctrl_Q:
+		ctrl_x_mode = CTRL_X_CMDLINE;
+		break;
+	    case Ctrl_P:
+	    case Ctrl_N:
+		// ^X^P means LOCAL expansion if nothing interrupted (eg we
+		// just started ^X mode, or there were enough ^X's to cancel
+		// the previous mode, say ^X^F^X^X^P or ^P^X^X^X^P, see below)
+		// do normal expansion when interrupting a different mode (say
+		// ^X^F^X^P or ^P^X^X^P, see below)
+		// nothing changes if interrupting mode 0, (eg, the flag
+		// doesn't change when going to ADDING mode  -- Acevedo
+		if (!(compl_cont_status & CONT_INTRPT))
+		    compl_cont_status |= CONT_LOCAL;
+		else if (compl_cont_mode != 0)
+		    compl_cont_status &= ~CONT_LOCAL;
+		// FALLTHROUGH
+	    default:
+		// If we have typed at least 2 ^X's... for modes != 0, we set
+		// compl_cont_status = 0 (eg, as if we had just started ^X
+		// mode).
+		// For mode 0, we set "compl_cont_mode" to an impossible
+		// value, in both cases ^X^X can be used to restart the same
+		// mode (avoiding ADDING mode).
+		// Undocumented feature: In a mode != 0 ^X^P and ^X^X^P start
+		// 'complete' and local ^P expansions respectively.
+		// In mode 0 an extra ^X is needed since ^X^P goes to ADDING
+		// mode  -- Acevedo
+		if (c == Ctrl_X)
+		{
+		    if (compl_cont_mode != 0)
+			compl_cont_status = 0;
+		    else
+			compl_cont_mode = CTRL_X_NOT_DEFINED_YET;
+		}
+		ctrl_x_mode = CTRL_X_NORMAL;
+		edit_submode = NULL;
+		showmode();
+		break;
+	}
+    }
+    else if (ctrl_x_mode != CTRL_X_NORMAL)
+    {
+	// We're already in CTRL-X mode, do we stay in it?
+	if (!vim_is_ctrl_x_key(c))
+	{
+	    if (ctrl_x_mode == CTRL_X_SCROLL)
+		ctrl_x_mode = CTRL_X_NORMAL;
+	    else
+		ctrl_x_mode = CTRL_X_FINISHED;
+	    edit_submode = NULL;
+	}
+	showmode();
+    }
+
+    if (compl_started || ctrl_x_mode == CTRL_X_FINISHED)
+    {
+	// Show error message from attempted keyword completion (probably
+	// 'Pattern not found') until another key is hit, then go back to
+	// showing what mode we are in.
+	showmode();
+	if ((ctrl_x_mode == CTRL_X_NORMAL && c != Ctrl_N && c != Ctrl_P
+				       && c != Ctrl_R && !ins_compl_pum_key(c))
+		|| ctrl_x_mode == CTRL_X_FINISHED)
+	{
+	    // Get here when we have finished typing a sequence of ^N and
+	    // ^P or other completion characters in CTRL-X mode.  Free up
+	    // memory that was used, and make sure we can redo the insert.
+	    if (compl_curr_match != NULL || compl_leader != NULL || c == Ctrl_E)
+	    {
+		// If any of the original typed text has been changed, eg when
+		// ignorecase is set, we must add back-spaces to the redo
+		// buffer.  We add as few as necessary to delete just the part
+		// of the original text that has changed.
+		// When using the longest match, edited the match or used
+		// CTRL-E then don't use the current match.
+		if (compl_curr_match != NULL && compl_used_match && c != Ctrl_E)
+		    ptr = compl_curr_match->cp_str;
+		else
+		    ptr = NULL;
+		ins_compl_fixRedoBufForLeader(ptr);
+	    }
+
+#ifdef FEAT_CINDENT
+	    want_cindent = (can_cindent_get() && cindent_on());
+#endif
+	    // When completing whole lines: fix indent for 'cindent'.
+	    // Otherwise, break line if it's too long.
+	    if (compl_cont_mode == CTRL_X_WHOLE_LINE)
+	    {
+#ifdef FEAT_CINDENT
+		// re-indent the current line
+		if (want_cindent)
+		{
+		    do_c_expr_indent();
+		    want_cindent = FALSE;	// don't do it again
+		}
+#endif
+	    }
+	    else
+	    {
+		int prev_col = curwin->w_cursor.col;
+
+		// put the cursor on the last char, for 'tw' formatting
+		if (prev_col > 0)
+		    dec_cursor();
+		// only format when something was inserted
+		if (!arrow_used && !ins_need_undo_get() && c != Ctrl_E)
+		    insertchar(NUL, 0, -1);
+		if (prev_col > 0
+			     && ml_get_curline()[curwin->w_cursor.col] != NUL)
+		    inc_cursor();
+	    }
+
+	    // If the popup menu is displayed pressing CTRL-Y means accepting
+	    // the selection without inserting anything.  When
+	    // compl_enter_selects is set the Enter key does the same.
+	    if ((c == Ctrl_Y || (compl_enter_selects
+				   && (c == CAR || c == K_KENTER || c == NL)))
+		    && pum_visible())
+		retval = TRUE;
+
+	    // CTRL-E means completion is Ended, go back to the typed text.
+	    // but only do this, if the Popup is still visible
+	    if (c == Ctrl_E)
+	    {
+		ins_compl_delete();
+		if (compl_leader != NULL)
+		    ins_bytes(compl_leader + ins_compl_len());
+		else if (compl_first_match != NULL)
+		    ins_bytes(compl_orig_text + ins_compl_len());
+		retval = TRUE;
+	    }
+
+	    auto_format(FALSE, TRUE);
+
+	    ins_compl_free();
+	    compl_started = FALSE;
+	    compl_matches = 0;
+	    if (!shortmess(SHM_COMPLETIONMENU))
+		msg_clr_cmdline();	// necessary for "noshowmode"
+	    ctrl_x_mode = CTRL_X_NORMAL;
+	    compl_enter_selects = FALSE;
+	    if (edit_submode != NULL)
+	    {
+		edit_submode = NULL;
+		showmode();
+	    }
+
+#ifdef FEAT_CMDWIN
+	    if (c == Ctrl_C && cmdwin_type != 0)
+		// Avoid the popup menu remains displayed when leaving the
+		// command line window.
+		update_screen(0);
+#endif
+#ifdef FEAT_CINDENT
+	    // Indent now if a key was typed that is in 'cinkeys'.
+	    if (want_cindent && in_cinkeys(KEY_COMPLETE, ' ', inindent(0)))
+		do_c_expr_indent();
+#endif
+	    // Trigger the CompleteDone event to give scripts a chance to act
+	    // upon the completion.
+	    ins_apply_autocmds(EVENT_COMPLETEDONE);
+	}
+    }
+    else if (ctrl_x_mode == CTRL_X_LOCAL_MSG)
+	// Trigger the CompleteDone event to give scripts a chance to act
+	// upon the (possibly failed) completion.
+	ins_apply_autocmds(EVENT_COMPLETEDONE);
+
+    // reset continue_* if we left expansion-mode, if we stay they'll be
+    // (re)set properly in ins_complete()
+    if (!vim_is_ctrl_x_key(c))
+    {
+	compl_cont_status = 0;
+	compl_cont_mode = 0;
+    }
+
+    return retval;
+}
+
+/*
+ * Fix the redo buffer for the completion leader replacing some of the typed
+ * text.  This inserts backspaces and appends the changed text.
+ * "ptr" is the known leader text or NUL.
+ */
+    static void
+ins_compl_fixRedoBufForLeader(char_u *ptr_arg)
+{
+    int	    len;
+    char_u  *p;
+    char_u  *ptr = ptr_arg;
+
+    if (ptr == NULL)
+    {
+	if (compl_leader != NULL)
+	    ptr = compl_leader;
+	else
+	    return;  // nothing to do
+    }
+    if (compl_orig_text != NULL)
+    {
+	p = compl_orig_text;
+	for (len = 0; p[len] != NUL && p[len] == ptr[len]; ++len)
+	    ;
+	if (len > 0)
+	    len -= (*mb_head_off)(p, p + len);
+	for (p += len; *p != NUL; MB_PTR_ADV(p))
+	    AppendCharToRedobuff(K_BS);
+    }
+    else
+	len = 0;
+    if (ptr != NULL)
+	AppendToRedobuffLit(ptr + len, -1);
+}
+
+/*
+ * Loops through the list of windows, loaded-buffers or non-loaded-buffers
+ * (depending on flag) starting from buf and looking for a non-scanned
+ * buffer (other than curbuf).	curbuf is special, if it is called with
+ * buf=curbuf then it has to be the first call for a given flag/expansion.
+ *
+ * Returns the buffer to scan, if any, otherwise returns curbuf -- Acevedo
+ */
+    static buf_T *
+ins_compl_next_buf(buf_T *buf, int flag)
+{
+    static win_T *wp = NULL;
+
+    if (flag == 'w')		// just windows
+    {
+	if (buf == curbuf || wp == NULL)  // first call for this flag/expansion
+	    wp = curwin;
+	while ((wp = (wp->w_next != NULL ? wp->w_next : firstwin)) != curwin
+		&& wp->w_buffer->b_scanned)
+	    ;
+	buf = wp->w_buffer;
+    }
+    else
+	// 'b' (just loaded buffers), 'u' (just non-loaded buffers) or 'U'
+	// (unlisted buffers)
+	// When completing whole lines skip unloaded buffers.
+	while ((buf = (buf->b_next != NULL ? buf->b_next : firstbuf)) != curbuf
+		&& ((flag == 'U'
+			? buf->b_p_bl
+			: (!buf->b_p_bl
+			    || (buf->b_ml.ml_mfp == NULL) != (flag == 'u')))
+		    || buf->b_scanned))
+	    ;
+    return buf;
+}
+
+#ifdef FEAT_COMPL_FUNC
+/*
+ * Execute user defined complete function 'completefunc' or 'omnifunc', and
+ * get matches in "matches".
+ */
+    static void
+expand_by_function(
+    int		type,	    // CTRL_X_OMNI or CTRL_X_FUNCTION
+    char_u	*base)
+{
+    list_T      *matchlist = NULL;
+    dict_T	*matchdict = NULL;
+    typval_T	args[3];
+    char_u	*funcname;
+    pos_T	pos;
+    win_T	*curwin_save;
+    buf_T	*curbuf_save;
+    typval_T	rettv;
+    int		save_State = State;
+
+    funcname = (type == CTRL_X_FUNCTION) ? curbuf->b_p_cfu : curbuf->b_p_ofu;
+    if (*funcname == NUL)
+	return;
+
+    // Call 'completefunc' to obtain the list of matches.
+    args[0].v_type = VAR_NUMBER;
+    args[0].vval.v_number = 0;
+    args[1].v_type = VAR_STRING;
+    args[1].vval.v_string = base != NULL ? base : (char_u *)"";
+    args[2].v_type = VAR_UNKNOWN;
+
+    pos = curwin->w_cursor;
+    curwin_save = curwin;
+    curbuf_save = curbuf;
+
+    // Call a function, which returns a list or dict.
+    if (call_vim_function(funcname, 2, args, &rettv) == OK)
+    {
+	switch (rettv.v_type)
+	{
+	    case VAR_LIST:
+		matchlist = rettv.vval.v_list;
+		break;
+	    case VAR_DICT:
+		matchdict = rettv.vval.v_dict;
+		break;
+	    case VAR_SPECIAL:
+		if (rettv.vval.v_number == VVAL_NONE)
+		    compl_opt_suppress_empty = TRUE;
+		// FALLTHROUGH
+	    default:
+		// TODO: Give error message?
+		clear_tv(&rettv);
+		break;
+	}
+    }
+
+    if (curwin_save != curwin || curbuf_save != curbuf)
+    {
+	emsg(_(e_complwin));
+	goto theend;
+    }
+    curwin->w_cursor = pos;	// restore the cursor position
+    validate_cursor();
+    if (!EQUAL_POS(curwin->w_cursor, pos))
+    {
+	emsg(_(e_compldel));
+	goto theend;
+    }
+
+    if (matchlist != NULL)
+	ins_compl_add_list(matchlist);
+    else if (matchdict != NULL)
+	ins_compl_add_dict(matchdict);
+
+theend:
+    // Restore State, it might have been changed.
+    State = save_State;
+
+    if (matchdict != NULL)
+	dict_unref(matchdict);
+    if (matchlist != NULL)
+	list_unref(matchlist);
+}
+#endif // FEAT_COMPL_FUNC
+
+#if defined(FEAT_COMPL_FUNC) || defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Add completions from a list.
+ */
+    static void
+ins_compl_add_list(list_T *list)
+{
+    listitem_T	*li;
+    int		dir = compl_direction;
+
+    // Go through the List with matches and add each of them.
+    for (li = list->lv_first; li != NULL; li = li->li_next)
+    {
+	if (ins_compl_add_tv(&li->li_tv, dir) == OK)
+	    // if dir was BACKWARD then honor it just once
+	    dir = FORWARD;
+	else if (did_emsg)
+	    break;
+    }
+}
+
+/*
+ * Add completions from a dict.
+ */
+    static void
+ins_compl_add_dict(dict_T *dict)
+{
+    dictitem_T	*di_refresh;
+    dictitem_T	*di_words;
+
+    // Check for optional "refresh" item.
+    compl_opt_refresh_always = FALSE;
+    di_refresh = dict_find(dict, (char_u *)"refresh", 7);
+    if (di_refresh != NULL && di_refresh->di_tv.v_type == VAR_STRING)
+    {
+	char_u	*v = di_refresh->di_tv.vval.v_string;
+
+	if (v != NULL && STRCMP(v, (char_u *)"always") == 0)
+	    compl_opt_refresh_always = TRUE;
+    }
+
+    // Add completions from a "words" list.
+    di_words = dict_find(dict, (char_u *)"words", 5);
+    if (di_words != NULL && di_words->di_tv.v_type == VAR_LIST)
+	ins_compl_add_list(di_words->di_tv.vval.v_list);
+}
+
+/*
+ * Add a match to the list of matches from a typeval_T.
+ * If the given string is already in the list of completions, then return
+ * NOTDONE, otherwise add it to the list and return OK.  If there is an error,
+ * maybe because alloc() returns NULL, then FAIL is returned.
+ */
+    int
+ins_compl_add_tv(typval_T *tv, int dir)
+{
+    char_u	*word;
+    int		icase = FALSE;
+    int		adup = FALSE;
+    int		aempty = FALSE;
+    char_u	*(cptext[CPT_COUNT]);
+
+    if (tv->v_type == VAR_DICT && tv->vval.v_dict != NULL)
+    {
+	word = dict_get_string(tv->vval.v_dict, (char_u *)"word", FALSE);
+	cptext[CPT_ABBR] = dict_get_string(tv->vval.v_dict,
+						     (char_u *)"abbr", FALSE);
+	cptext[CPT_MENU] = dict_get_string(tv->vval.v_dict,
+						     (char_u *)"menu", FALSE);
+	cptext[CPT_KIND] = dict_get_string(tv->vval.v_dict,
+						     (char_u *)"kind", FALSE);
+	cptext[CPT_INFO] = dict_get_string(tv->vval.v_dict,
+						     (char_u *)"info", FALSE);
+	cptext[CPT_USER_DATA] = dict_get_string(tv->vval.v_dict,
+						 (char_u *)"user_data", FALSE);
+	if (dict_get_string(tv->vval.v_dict, (char_u *)"icase", FALSE) != NULL)
+	    icase = dict_get_number(tv->vval.v_dict, (char_u *)"icase");
+	if (dict_get_string(tv->vval.v_dict, (char_u *)"dup", FALSE) != NULL)
+	    adup = dict_get_number(tv->vval.v_dict, (char_u *)"dup");
+	if (dict_get_string(tv->vval.v_dict, (char_u *)"empty", FALSE) != NULL)
+	    aempty = dict_get_number(tv->vval.v_dict, (char_u *)"empty");
+    }
+    else
+    {
+	word = tv_get_string_chk(tv);
+	vim_memset(cptext, 0, sizeof(cptext));
+    }
+    if (word == NULL || (!aempty && *word == NUL))
+	return FAIL;
+    return ins_compl_add(word, -1, icase, NULL, cptext, dir, 0, adup);
+}
+#endif
+
+/*
+ * Get the next expansion(s), using "compl_pattern".
+ * The search starts at position "ini" in curbuf and in the direction
+ * compl_direction.
+ * When "compl_started" is FALSE start at that position, otherwise continue
+ * where we stopped searching before.
+ * This may return before finding all the matches.
+ * Return the total number of matches or -1 if still unknown -- Acevedo
+ */
+    static int
+ins_compl_get_exp(pos_T *ini)
+{
+    static pos_T	first_match_pos;
+    static pos_T	last_match_pos;
+    static char_u	*e_cpt = (char_u *)"";	// curr. entry in 'complete'
+    static int		found_all = FALSE;	// Found all matches of a
+						// certain type.
+    static buf_T	*ins_buf = NULL;	// buffer being scanned
+
+    pos_T	*pos;
+    char_u	**matches;
+    int		save_p_scs;
+    int		save_p_ws;
+    int		save_p_ic;
+    int		i;
+    int		num_matches;
+    int		len;
+    int		found_new_match;
+    int		type = ctrl_x_mode;
+    char_u	*ptr;
+    char_u	*dict = NULL;
+    int		dict_f = 0;
+    int		set_match_pos;
+
+    if (!compl_started)
+    {
+	FOR_ALL_BUFFERS(ins_buf)
+	    ins_buf->b_scanned = 0;
+	found_all = FALSE;
+	ins_buf = curbuf;
+	e_cpt = (compl_cont_status & CONT_LOCAL)
+					    ? (char_u *)"." : curbuf->b_p_cpt;
+	last_match_pos = first_match_pos = *ini;
+    }
+    else if (ins_buf != curbuf && !buf_valid(ins_buf))
+	ins_buf = curbuf;  // In case the buffer was wiped out.
+
+    compl_old_match = compl_curr_match;	// remember the last current match
+    pos = (compl_direction == FORWARD) ? &last_match_pos : &first_match_pos;
+
+    // For ^N/^P loop over all the flags/windows/buffers in 'complete'.
+    for (;;)
+    {
+	found_new_match = FAIL;
+	set_match_pos = FALSE;
+
+	// For ^N/^P pick a new entry from e_cpt if compl_started is off,
+	// or if found_all says this entry is done.  For ^X^L only use the
+	// entries from 'complete' that look in loaded buffers.
+	if ((ctrl_x_mode == CTRL_X_NORMAL
+		    || ctrl_x_mode_line_or_eval())
+					&& (!compl_started || found_all))
+	{
+	    found_all = FALSE;
+	    while (*e_cpt == ',' || *e_cpt == ' ')
+		e_cpt++;
+	    if (*e_cpt == '.' && !curbuf->b_scanned)
+	    {
+		ins_buf = curbuf;
+		first_match_pos = *ini;
+		// Move the cursor back one character so that ^N can match the
+		// word immediately after the cursor.
+		if (ctrl_x_mode == CTRL_X_NORMAL && dec(&first_match_pos) < 0)
+		{
+		    // Move the cursor to after the last character in the
+		    // buffer, so that word at start of buffer is found
+		    // correctly.
+		    first_match_pos.lnum = ins_buf->b_ml.ml_line_count;
+		    first_match_pos.col =
+				 (colnr_T)STRLEN(ml_get(first_match_pos.lnum));
+		}
+		last_match_pos = first_match_pos;
+		type = 0;
+
+		// Remember the first match so that the loop stops when we
+		// wrap and come back there a second time.
+		set_match_pos = TRUE;
+	    }
+	    else if (vim_strchr((char_u *)"buwU", *e_cpt) != NULL
+		 && (ins_buf = ins_compl_next_buf(ins_buf, *e_cpt)) != curbuf)
+	    {
+		// Scan a buffer, but not the current one.
+		if (ins_buf->b_ml.ml_mfp != NULL)   // loaded buffer
+		{
+		    compl_started = TRUE;
+		    first_match_pos.col = last_match_pos.col = 0;
+		    first_match_pos.lnum = ins_buf->b_ml.ml_line_count + 1;
+		    last_match_pos.lnum = 0;
+		    type = 0;
+		}
+		else	// unloaded buffer, scan like dictionary
+		{
+		    found_all = TRUE;
+		    if (ins_buf->b_fname == NULL)
+			continue;
+		    type = CTRL_X_DICTIONARY;
+		    dict = ins_buf->b_fname;
+		    dict_f = DICT_EXACT;
+		}
+		vim_snprintf((char *)IObuff, IOSIZE, _("Scanning: %s"),
+			ins_buf->b_fname == NULL
+			    ? buf_spname(ins_buf)
+			    : ins_buf->b_sfname == NULL
+				? ins_buf->b_fname
+				: ins_buf->b_sfname);
+		(void)msg_trunc_attr((char *)IObuff, TRUE, HL_ATTR(HLF_R));
+	    }
+	    else if (*e_cpt == NUL)
+		break;
+	    else
+	    {
+		if (ctrl_x_mode_line_or_eval())
+		    type = -1;
+		else if (*e_cpt == 'k' || *e_cpt == 's')
+		{
+		    if (*e_cpt == 'k')
+			type = CTRL_X_DICTIONARY;
+		    else
+			type = CTRL_X_THESAURUS;
+		    if (*++e_cpt != ',' && *e_cpt != NUL)
+		    {
+			dict = e_cpt;
+			dict_f = DICT_FIRST;
+		    }
+		}
+#ifdef FEAT_FIND_ID
+		else if (*e_cpt == 'i')
+		    type = CTRL_X_PATH_PATTERNS;
+		else if (*e_cpt == 'd')
+		    type = CTRL_X_PATH_DEFINES;
+#endif
+		else if (*e_cpt == ']' || *e_cpt == 't')
+		{
+		    type = CTRL_X_TAGS;
+		    vim_snprintf((char *)IObuff, IOSIZE, _("Scanning tags."));
+		    (void)msg_trunc_attr((char *)IObuff, TRUE, HL_ATTR(HLF_R));
+		}
+		else
+		    type = -1;
+
+		// in any case e_cpt is advanced to the next entry
+		(void)copy_option_part(&e_cpt, IObuff, IOSIZE, ",");
+
+		found_all = TRUE;
+		if (type == -1)
+		    continue;
+	    }
+	}
+
+	// If complete() was called then compl_pattern has been reset.  The
+	// following won't work then, bail out.
+	if (compl_pattern == NULL)
+	    break;
+
+	switch (type)
+	{
+	case -1:
+	    break;
+#ifdef FEAT_FIND_ID
+	case CTRL_X_PATH_PATTERNS:
+	case CTRL_X_PATH_DEFINES:
+	    find_pattern_in_path(compl_pattern, compl_direction,
+				 (int)STRLEN(compl_pattern), FALSE, FALSE,
+				 (type == CTRL_X_PATH_DEFINES
+				  && !(compl_cont_status & CONT_SOL))
+				 ? FIND_DEFINE : FIND_ANY, 1L, ACTION_EXPAND,
+				 (linenr_T)1, (linenr_T)MAXLNUM);
+	    break;
+#endif
+
+	case CTRL_X_DICTIONARY:
+	case CTRL_X_THESAURUS:
+	    ins_compl_dictionaries(
+		    dict != NULL ? dict
+			 : (type == CTRL_X_THESAURUS
+			     ? (*curbuf->b_p_tsr == NUL
+				 ? p_tsr
+				 : curbuf->b_p_tsr)
+			     : (*curbuf->b_p_dict == NUL
+				 ? p_dict
+				 : curbuf->b_p_dict)),
+			    compl_pattern,
+				 dict != NULL ? dict_f
+					       : 0, type == CTRL_X_THESAURUS);
+	    dict = NULL;
+	    break;
+
+	case CTRL_X_TAGS:
+	    // set p_ic according to p_ic, p_scs and pat for find_tags().
+	    save_p_ic = p_ic;
+	    p_ic = ignorecase(compl_pattern);
+
+	    // Find up to TAG_MANY matches.  Avoids that an enormous number
+	    // of matches is found when compl_pattern is empty
+	    if (find_tags(compl_pattern, &num_matches, &matches,
+		    TAG_REGEXP | TAG_NAMES | TAG_NOIC | TAG_INS_COMP
+		    | (ctrl_x_mode != CTRL_X_NORMAL ? TAG_VERBOSE : 0),
+		    TAG_MANY, curbuf->b_ffname) == OK && num_matches > 0)
+	    {
+		ins_compl_add_matches(num_matches, matches, p_ic);
+	    }
+	    p_ic = save_p_ic;
+	    break;
+
+	case CTRL_X_FILES:
+	    if (expand_wildcards(1, &compl_pattern, &num_matches, &matches,
+				  EW_FILE|EW_DIR|EW_ADDSLASH|EW_SILENT) == OK)
+	    {
+
+		// May change home directory back to "~".
+		tilde_replace(compl_pattern, num_matches, matches);
+		ins_compl_add_matches(num_matches, matches, p_fic || p_wic);
+	    }
+	    break;
+
+	case CTRL_X_CMDLINE:
+	    if (expand_cmdline(&compl_xp, compl_pattern,
+			(int)STRLEN(compl_pattern),
+					 &num_matches, &matches) == EXPAND_OK)
+		ins_compl_add_matches(num_matches, matches, FALSE);
+	    break;
+
+#ifdef FEAT_COMPL_FUNC
+	case CTRL_X_FUNCTION:
+	case CTRL_X_OMNI:
+	    expand_by_function(type, compl_pattern);
+	    break;
+#endif
+
+	case CTRL_X_SPELL:
+#ifdef FEAT_SPELL
+	    num_matches = expand_spelling(first_match_pos.lnum,
+						     compl_pattern, &matches);
+	    if (num_matches > 0)
+		ins_compl_add_matches(num_matches, matches, p_ic);
+#endif
+	    break;
+
+	default:	// normal ^P/^N and ^X^L
+	    // If 'infercase' is set, don't use 'smartcase' here
+	    save_p_scs = p_scs;
+	    if (ins_buf->b_p_inf)
+		p_scs = FALSE;
+
+	    //	Buffers other than curbuf are scanned from the beginning or the
+	    //	end but never from the middle, thus setting nowrapscan in this
+	    //	buffers is a good idea, on the other hand, we always set
+	    //	wrapscan for curbuf to avoid missing matches -- Acevedo,Webb
+	    save_p_ws = p_ws;
+	    if (ins_buf != curbuf)
+		p_ws = FALSE;
+	    else if (*e_cpt == '.')
+		p_ws = TRUE;
+	    for (;;)
+	    {
+		int	flags = 0;
+
+		++msg_silent;  // Don't want messages for wrapscan.
+
+		// ctrl_x_mode_line_or_eval() || word-wise search that
+		// has added a word that was at the beginning of the line
+		if (ctrl_x_mode_line_or_eval()
+			|| (compl_cont_status & CONT_SOL))
+		    found_new_match = search_for_exact_line(ins_buf, pos,
+					      compl_direction, compl_pattern);
+		else
+		    found_new_match = searchit(NULL, ins_buf, pos, NULL,
+							      compl_direction,
+				 compl_pattern, 1L, SEARCH_KEEP + SEARCH_NFMSG,
+					     RE_LAST, (linenr_T)0, NULL, NULL);
+		--msg_silent;
+		if (!compl_started || set_match_pos)
+		{
+		    // set "compl_started" even on fail
+		    compl_started = TRUE;
+		    first_match_pos = *pos;
+		    last_match_pos = *pos;
+		    set_match_pos = FALSE;
+		}
+		else if (first_match_pos.lnum == last_match_pos.lnum
+				 && first_match_pos.col == last_match_pos.col)
+		    found_new_match = FAIL;
+		if (found_new_match == FAIL)
+		{
+		    if (ins_buf == curbuf)
+			found_all = TRUE;
+		    break;
+		}
+
+		// when ADDING, the text before the cursor matches, skip it
+		if (	(compl_cont_status & CONT_ADDING) && ins_buf == curbuf
+			&& ini->lnum == pos->lnum
+			&& ini->col  == pos->col)
+		    continue;
+		ptr = ml_get_buf(ins_buf, pos->lnum, FALSE) + pos->col;
+		if (ctrl_x_mode_line_or_eval())
+		{
+		    if (compl_cont_status & CONT_ADDING)
+		    {
+			if (pos->lnum >= ins_buf->b_ml.ml_line_count)
+			    continue;
+			ptr = ml_get_buf(ins_buf, pos->lnum + 1, FALSE);
+			if (!p_paste)
+			    ptr = skipwhite(ptr);
+		    }
+		    len = (int)STRLEN(ptr);
+		}
+		else
+		{
+		    char_u	*tmp_ptr = ptr;
+
+		    if (compl_cont_status & CONT_ADDING)
+		    {
+			tmp_ptr += compl_length;
+			// Skip if already inside a word.
+			if (vim_iswordp(tmp_ptr))
+			    continue;
+			// Find start of next word.
+			tmp_ptr = find_word_start(tmp_ptr);
+		    }
+		    // Find end of this word.
+		    tmp_ptr = find_word_end(tmp_ptr);
+		    len = (int)(tmp_ptr - ptr);
+
+		    if ((compl_cont_status & CONT_ADDING)
+						       && len == compl_length)
+		    {
+			if (pos->lnum < ins_buf->b_ml.ml_line_count)
+			{
+			    // Try next line, if any. the new word will be
+			    // "join" as if the normal command "J" was used.
+			    // IOSIZE is always greater than
+			    // compl_length, so the next STRNCPY always
+			    // works -- Acevedo
+			    STRNCPY(IObuff, ptr, len);
+			    ptr = ml_get_buf(ins_buf, pos->lnum + 1, FALSE);
+			    tmp_ptr = ptr = skipwhite(ptr);
+			    // Find start of next word.
+			    tmp_ptr = find_word_start(tmp_ptr);
+			    // Find end of next word.
+			    tmp_ptr = find_word_end(tmp_ptr);
+			    if (tmp_ptr > ptr)
+			    {
+				if (*ptr != ')' && IObuff[len - 1] != TAB)
+				{
+				    if (IObuff[len - 1] != ' ')
+					IObuff[len++] = ' ';
+				    // IObuf =~ "\k.* ", thus len >= 2
+				    if (p_js
+					&& (IObuff[len - 2] == '.'
+					    || (vim_strchr(p_cpo, CPO_JOINSP)
+								       == NULL
+						&& (IObuff[len - 2] == '?'
+						 || IObuff[len - 2] == '!'))))
+					IObuff[len++] = ' ';
+				}
+				// copy as much as possible of the new word
+				if (tmp_ptr - ptr >= IOSIZE - len)
+				    tmp_ptr = ptr + IOSIZE - len - 1;
+				STRNCPY(IObuff + len, ptr, tmp_ptr - ptr);
+				len += (int)(tmp_ptr - ptr);
+				flags |= CONT_S_IPOS;
+			    }
+			    IObuff[len] = NUL;
+			    ptr = IObuff;
+			}
+			if (len == compl_length)
+			    continue;
+		    }
+		}
+		if (ins_compl_add_infercase(ptr, len, p_ic,
+				 ins_buf == curbuf ? NULL : ins_buf->b_sfname,
+					   0, flags) != NOTDONE)
+		{
+		    found_new_match = OK;
+		    break;
+		}
+	    }
+	    p_scs = save_p_scs;
+	    p_ws = save_p_ws;
+	}
+
+	// check if compl_curr_match has changed, (e.g. other type of
+	// expansion added something)
+	if (type != 0 && compl_curr_match != compl_old_match)
+	    found_new_match = OK;
+
+	// break the loop for specialized modes (use 'complete' just for the
+	// generic ctrl_x_mode == CTRL_X_NORMAL) or when we've found a new
+	// match
+	if ((ctrl_x_mode != CTRL_X_NORMAL
+		    && !ctrl_x_mode_line_or_eval()) || found_new_match != FAIL)
+	{
+	    if (got_int)
+		break;
+	    // Fill the popup menu as soon as possible.
+	    if (type != -1)
+		ins_compl_check_keys(0, FALSE);
+
+	    if ((ctrl_x_mode != CTRL_X_NORMAL
+			&& !ctrl_x_mode_line_or_eval()) || compl_interrupted)
+		break;
+	    compl_started = TRUE;
+	}
+	else
+	{
+	    // Mark a buffer scanned when it has been scanned completely
+	    if (type == 0 || type == CTRL_X_PATH_PATTERNS)
+		ins_buf->b_scanned = TRUE;
+
+	    compl_started = FALSE;
+	}
+    }
+    compl_started = TRUE;
+
+    if ((ctrl_x_mode == CTRL_X_NORMAL || ctrl_x_mode_line_or_eval())
+	    && *e_cpt == NUL)		// Got to end of 'complete'
+	found_new_match = FAIL;
+
+    i = -1;		// total of matches, unknown
+    if (found_new_match == FAIL || (ctrl_x_mode != CTRL_X_NORMAL
+					       && !ctrl_x_mode_line_or_eval()))
+	i = ins_compl_make_cyclic();
+
+    if (compl_old_match != NULL)
+    {
+	// If several matches were added (FORWARD) or the search failed and has
+	// just been made cyclic then we have to move compl_curr_match to the
+	// next or previous entry (if any) -- Acevedo
+	compl_curr_match = compl_direction == FORWARD ? compl_old_match->cp_next
+						    : compl_old_match->cp_prev;
+	if (compl_curr_match == NULL)
+	    compl_curr_match = compl_old_match;
+    }
+    return i;
+}
+
+/*
+ * Delete the old text being completed.
+ */
+    void
+ins_compl_delete(void)
+{
+    int	    col;
+
+    // In insert mode: Delete the typed part.
+    // In replace mode: Put the old characters back, if any.
+    col = compl_col + (compl_cont_status & CONT_ADDING ? compl_length : 0);
+    if ((int)curwin->w_cursor.col > col)
+    {
+	if (stop_arrow() == FAIL)
+	    return;
+	backspace_until_column(col);
+    }
+
+    // TODO: is this sufficient for redrawing?  Redrawing everything causes
+    // flicker, thus we can't do that.
+    changed_cline_bef_curs();
+    // clear v:completed_item
+    set_vim_var_dict(VV_COMPLETED_ITEM, dict_alloc_lock(VAR_FIXED));
+}
+
+/*
+ * Insert the new text being completed.
+ * "in_compl_func" is TRUE when called from complete_check().
+ */
+    void
+ins_compl_insert(int in_compl_func)
+{
+    dict_T	*dict;
+
+    ins_bytes(compl_shown_match->cp_str + ins_compl_len());
+    if (compl_shown_match->cp_flags & ORIGINAL_TEXT)
+	compl_used_match = FALSE;
+    else
+	compl_used_match = TRUE;
+
+    // Set completed item.
+    // { word, abbr, menu, kind, info }
+    dict = dict_alloc_lock(VAR_FIXED);
+    if (dict != NULL)
+    {
+	dict_add_string(dict, "word", compl_shown_match->cp_str);
+	dict_add_string(dict, "abbr", compl_shown_match->cp_text[CPT_ABBR]);
+	dict_add_string(dict, "menu", compl_shown_match->cp_text[CPT_MENU]);
+	dict_add_string(dict, "kind", compl_shown_match->cp_text[CPT_KIND]);
+	dict_add_string(dict, "info", compl_shown_match->cp_text[CPT_INFO]);
+	dict_add_string(dict, "user_data",
+				 compl_shown_match->cp_text[CPT_USER_DATA]);
+    }
+    set_vim_var_dict(VV_COMPLETED_ITEM, dict);
+    if (!in_compl_func)
+	compl_curr_match = compl_shown_match;
+}
+
+/*
+ * Fill in the next completion in the current direction.
+ * If "allow_get_expansion" is TRUE, then we may call ins_compl_get_exp() to
+ * get more completions.  If it is FALSE, then we just do nothing when there
+ * are no more completions in a given direction.  The latter case is used when
+ * we are still in the middle of finding completions, to allow browsing
+ * through the ones found so far.
+ * Return the total number of matches, or -1 if still unknown -- webb.
+ *
+ * compl_curr_match is currently being used by ins_compl_get_exp(), so we use
+ * compl_shown_match here.
+ *
+ * Note that this function may be called recursively once only.  First with
+ * "allow_get_expansion" TRUE, which calls ins_compl_get_exp(), which in turn
+ * calls this function with "allow_get_expansion" FALSE.
+ */
+    static int
+ins_compl_next(
+    int	    allow_get_expansion,
+    int	    count,		// repeat completion this many times; should
+				// be at least 1
+    int	    insert_match,	// Insert the newly selected match
+    int	    in_compl_func)	// called from complete_check()
+{
+    int	    num_matches = -1;
+    int	    todo = count;
+    compl_T *found_compl = NULL;
+    int	    found_end = FALSE;
+    int	    advance;
+    int	    started = compl_started;
+
+    // When user complete function return -1 for findstart which is next
+    // time of 'always', compl_shown_match become NULL.
+    if (compl_shown_match == NULL)
+	return -1;
+
+    if (compl_leader != NULL
+			&& (compl_shown_match->cp_flags & ORIGINAL_TEXT) == 0)
+    {
+	// Set "compl_shown_match" to the actually shown match, it may differ
+	// when "compl_leader" is used to omit some of the matches.
+	while (!ins_compl_equal(compl_shown_match,
+				      compl_leader, (int)STRLEN(compl_leader))
+		&& compl_shown_match->cp_next != NULL
+		&& compl_shown_match->cp_next != compl_first_match)
+	    compl_shown_match = compl_shown_match->cp_next;
+
+	// If we didn't find it searching forward, and compl_shows_dir is
+	// backward, find the last match.
+	if (compl_shows_dir == BACKWARD
+		&& !ins_compl_equal(compl_shown_match,
+				      compl_leader, (int)STRLEN(compl_leader))
+		&& (compl_shown_match->cp_next == NULL
+		    || compl_shown_match->cp_next == compl_first_match))
+	{
+	    while (!ins_compl_equal(compl_shown_match,
+				      compl_leader, (int)STRLEN(compl_leader))
+		    && compl_shown_match->cp_prev != NULL
+		    && compl_shown_match->cp_prev != compl_first_match)
+		compl_shown_match = compl_shown_match->cp_prev;
+	}
+    }
+
+    if (allow_get_expansion && insert_match
+	    && (!(compl_get_longest || compl_restarting) || compl_used_match))
+	// Delete old text to be replaced
+	ins_compl_delete();
+
+    // When finding the longest common text we stick at the original text,
+    // don't let CTRL-N or CTRL-P move to the first match.
+    advance = count != 1 || !allow_get_expansion || !compl_get_longest;
+
+    // When restarting the search don't insert the first match either.
+    if (compl_restarting)
+    {
+	advance = FALSE;
+	compl_restarting = FALSE;
+    }
+
+    // Repeat this for when <PageUp> or <PageDown> is typed.  But don't wrap
+    // around.
+    while (--todo >= 0)
+    {
+	if (compl_shows_dir == FORWARD && compl_shown_match->cp_next != NULL)
+	{
+	    compl_shown_match = compl_shown_match->cp_next;
+	    found_end = (compl_first_match != NULL
+			   && (compl_shown_match->cp_next == compl_first_match
+			       || compl_shown_match == compl_first_match));
+	}
+	else if (compl_shows_dir == BACKWARD
+					&& compl_shown_match->cp_prev != NULL)
+	{
+	    found_end = (compl_shown_match == compl_first_match);
+	    compl_shown_match = compl_shown_match->cp_prev;
+	    found_end |= (compl_shown_match == compl_first_match);
+	}
+	else
+	{
+	    if (!allow_get_expansion)
+	    {
+		if (advance)
+		{
+		    if (compl_shows_dir == BACKWARD)
+			compl_pending -= todo + 1;
+		    else
+			compl_pending += todo + 1;
+		}
+		return -1;
+	    }
+
+	    if (!compl_no_select && advance)
+	    {
+		if (compl_shows_dir == BACKWARD)
+		    --compl_pending;
+		else
+		    ++compl_pending;
+	    }
+
+	    // Find matches.
+	    num_matches = ins_compl_get_exp(&compl_startpos);
+
+	    // handle any pending completions
+	    while (compl_pending != 0 && compl_direction == compl_shows_dir
+								   && advance)
+	    {
+		if (compl_pending > 0 && compl_shown_match->cp_next != NULL)
+		{
+		    compl_shown_match = compl_shown_match->cp_next;
+		    --compl_pending;
+		}
+		if (compl_pending < 0 && compl_shown_match->cp_prev != NULL)
+		{
+		    compl_shown_match = compl_shown_match->cp_prev;
+		    ++compl_pending;
+		}
+		else
+		    break;
+	    }
+	    found_end = FALSE;
+	}
+	if ((compl_shown_match->cp_flags & ORIGINAL_TEXT) == 0
+		&& compl_leader != NULL
+		&& !ins_compl_equal(compl_shown_match,
+				     compl_leader, (int)STRLEN(compl_leader)))
+	    ++todo;
+	else
+	    // Remember a matching item.
+	    found_compl = compl_shown_match;
+
+	// Stop at the end of the list when we found a usable match.
+	if (found_end)
+	{
+	    if (found_compl != NULL)
+	    {
+		compl_shown_match = found_compl;
+		break;
+	    }
+	    todo = 1;	    // use first usable match after wrapping around
+	}
+    }
+
+    // Insert the text of the new completion, or the compl_leader.
+    if (compl_no_insert && !started)
+    {
+	ins_bytes(compl_orig_text + ins_compl_len());
+	compl_used_match = FALSE;
+    }
+    else if (insert_match)
+    {
+	if (!compl_get_longest || compl_used_match)
+	    ins_compl_insert(in_compl_func);
+	else
+	    ins_bytes(compl_leader + ins_compl_len());
+    }
+    else
+	compl_used_match = FALSE;
+
+    if (!allow_get_expansion)
+    {
+	// may undisplay the popup menu first
+	ins_compl_upd_pum();
+
+	if (pum_enough_matches())
+	    // Will display the popup menu, don't redraw yet to avoid flicker.
+	    pum_call_update_screen();
+	else
+	    // Not showing the popup menu yet, redraw to show the user what was
+	    // inserted.
+	    update_screen(0);
+
+	// display the updated popup menu
+	ins_compl_show_pum();
+#ifdef FEAT_GUI
+	if (gui.in_use)
+	{
+	    // Show the cursor after the match, not after the redrawn text.
+	    setcursor();
+	    out_flush_cursor(FALSE, FALSE);
+	}
+#endif
+
+	// Delete old text to be replaced, since we're still searching and
+	// don't want to match ourselves!
+	ins_compl_delete();
+    }
+
+    // Enter will select a match when the match wasn't inserted and the popup
+    // menu is visible.
+    if (compl_no_insert && !started)
+	compl_enter_selects = TRUE;
+    else
+	compl_enter_selects = !insert_match && compl_match_array != NULL;
+
+    // Show the file name for the match (if any)
+    // Truncate the file name to avoid a wait for return.
+    if (compl_shown_match->cp_fname != NULL)
+    {
+	char	*lead = _("match in file");
+	int	space = sc_col - vim_strsize((char_u *)lead) - 2;
+	char_u	*s;
+	char_u	*e;
+
+	if (space > 0)
+	{
+	    // We need the tail that fits.  With double-byte encoding going
+	    // back from the end is very slow, thus go from the start and keep
+	    // the text that fits in "space" between "s" and "e".
+	    for (s = e = compl_shown_match->cp_fname; *e != NUL; MB_PTR_ADV(e))
+	    {
+		space -= ptr2cells(e);
+		while (space < 0)
+		{
+		    space += ptr2cells(s);
+		    MB_PTR_ADV(s);
+		}
+	    }
+	    vim_snprintf((char *)IObuff, IOSIZE, "%s %s%s", lead,
+				s > compl_shown_match->cp_fname ? "<" : "", s);
+	    msg((char *)IObuff);
+	    redraw_cmdline = FALSE;	    // don't overwrite!
+	}
+    }
+
+    return num_matches;
+}
+
+/*
+ * Call this while finding completions, to check whether the user has hit a key
+ * that should change the currently displayed completion, or exit completion
+ * mode.  Also, when compl_pending is not zero, show a completion as soon as
+ * possible. -- webb
+ * "frequency" specifies out of how many calls we actually check.
+ * "in_compl_func" is TRUE when called from complete_check(), don't set
+ * compl_curr_match.
+ */
+    void
+ins_compl_check_keys(int frequency, int in_compl_func)
+{
+    static int	count = 0;
+    int		c;
+
+    // Don't check when reading keys from a script, :normal or feedkeys().
+    // That would break the test scripts.  But do check for keys when called
+    // from complete_check().
+    if (!in_compl_func && (using_script() || ex_normal_busy))
+	return;
+
+    // Only do this at regular intervals
+    if (++count < frequency)
+	return;
+    count = 0;
+
+    // Check for a typed key.  Do use mappings, otherwise vim_is_ctrl_x_key()
+    // can't do its work correctly.
+    c = vpeekc_any();
+    if (c != NUL)
+    {
+	if (vim_is_ctrl_x_key(c) && c != Ctrl_X && c != Ctrl_R)
+	{
+	    c = safe_vgetc();	// Eat the character
+	    compl_shows_dir = ins_compl_key2dir(c);
+	    (void)ins_compl_next(FALSE, ins_compl_key2count(c),
+				      c != K_UP && c != K_DOWN, in_compl_func);
+	}
+	else
+	{
+	    // Need to get the character to have KeyTyped set.  We'll put it
+	    // back with vungetc() below.  But skip K_IGNORE.
+	    c = safe_vgetc();
+	    if (c != K_IGNORE)
+	    {
+		// Don't interrupt completion when the character wasn't typed,
+		// e.g., when doing @q to replay keys.
+		if (c != Ctrl_R && KeyTyped)
+		    compl_interrupted = TRUE;
+
+		vungetc(c);
+	    }
+	}
+    }
+    if (compl_pending != 0 && !got_int && !compl_no_insert)
+    {
+	int todo = compl_pending > 0 ? compl_pending : -compl_pending;
+
+	compl_pending = 0;
+	(void)ins_compl_next(FALSE, todo, TRUE, in_compl_func);
+    }
+}
+
+/*
+ * Decide the direction of Insert mode complete from the key typed.
+ * Returns BACKWARD or FORWARD.
+ */
+    static int
+ins_compl_key2dir(int c)
+{
+    if (c == Ctrl_P || c == Ctrl_L
+	    || c == K_PAGEUP || c == K_KPAGEUP || c == K_S_UP || c == K_UP)
+	return BACKWARD;
+    return FORWARD;
+}
+
+/*
+ * Return TRUE for keys that are used for completion only when the popup menu
+ * is visible.
+ */
+    static int
+ins_compl_pum_key(int c)
+{
+    return pum_visible() && (c == K_PAGEUP || c == K_KPAGEUP || c == K_S_UP
+		     || c == K_PAGEDOWN || c == K_KPAGEDOWN || c == K_S_DOWN
+		     || c == K_UP || c == K_DOWN);
+}
+
+/*
+ * Decide the number of completions to move forward.
+ * Returns 1 for most keys, height of the popup menu for page-up/down keys.
+ */
+    static int
+ins_compl_key2count(int c)
+{
+    int		h;
+
+    if (ins_compl_pum_key(c) && c != K_UP && c != K_DOWN)
+    {
+	h = pum_get_height();
+	if (h > 3)
+	    h -= 2; // keep some context
+	return h;
+    }
+    return 1;
+}
+
+/*
+ * Return TRUE if completion with "c" should insert the match, FALSE if only
+ * to change the currently selected completion.
+ */
+    static int
+ins_compl_use_match(int c)
+{
+    switch (c)
+    {
+	case K_UP:
+	case K_DOWN:
+	case K_PAGEDOWN:
+	case K_KPAGEDOWN:
+	case K_S_DOWN:
+	case K_PAGEUP:
+	case K_KPAGEUP:
+	case K_S_UP:
+	    return FALSE;
+    }
+    return TRUE;
+}
+
+/*
+ * Do Insert mode completion.
+ * Called when character "c" was typed, which has a meaning for completion.
+ * Returns OK if completion was done, FAIL if something failed (out of mem).
+ */
+    int
+ins_complete(int c, int enable_pum)
+{
+    char_u	*line;
+    int		startcol = 0;	    // column where searched text starts
+    colnr_T	curs_col;	    // cursor column
+    int		n;
+    int		save_w_wrow;
+    int		save_w_leftcol;
+    int		insert_match;
+    int		save_did_ai = did_ai;
+
+    compl_direction = ins_compl_key2dir(c);
+    insert_match = ins_compl_use_match(c);
+
+    if (!compl_started)
+    {
+	// First time we hit ^N or ^P (in a row, I mean)
+
+	did_ai = FALSE;
+#ifdef FEAT_SMARTINDENT
+	did_si = FALSE;
+	can_si = FALSE;
+	can_si_back = FALSE;
+#endif
+	if (stop_arrow() == FAIL)
+	    return FAIL;
+
+	line = ml_get(curwin->w_cursor.lnum);
+	curs_col = curwin->w_cursor.col;
+	compl_pending = 0;
+
+	// If this same ctrl_x_mode has been interrupted use the text from
+	// "compl_startpos" to the cursor as a pattern to add a new word
+	// instead of expand the one before the cursor, in word-wise if
+	// "compl_startpos" is not in the same line as the cursor then fix it
+	// (the line has been split because it was longer than 'tw').  if SOL
+	// is set then skip the previous pattern, a word at the beginning of
+	// the line has been inserted, we'll look for that  -- Acevedo.
+	if ((compl_cont_status & CONT_INTRPT) == CONT_INTRPT
+					    && compl_cont_mode == ctrl_x_mode)
+	{
+	    // it is a continued search
+	    compl_cont_status &= ~CONT_INTRPT;	// remove INTRPT
+	    if (ctrl_x_mode == CTRL_X_NORMAL
+		    || ctrl_x_mode == CTRL_X_PATH_PATTERNS
+		    || ctrl_x_mode == CTRL_X_PATH_DEFINES)
+	    {
+		if (compl_startpos.lnum != curwin->w_cursor.lnum)
+		{
+		    // line (probably) wrapped, set compl_startpos to the
+		    // first non_blank in the line, if it is not a wordchar
+		    // include it to get a better pattern, but then we don't
+		    // want the "\\<" prefix, check it bellow
+		    compl_col = (colnr_T)getwhitecols(line);
+		    compl_startpos.col = compl_col;
+		    compl_startpos.lnum = curwin->w_cursor.lnum;
+		    compl_cont_status &= ~CONT_SOL;   // clear SOL if present
+		}
+		else
+		{
+		    // S_IPOS was set when we inserted a word that was at the
+		    // beginning of the line, which means that we'll go to SOL
+		    // mode but first we need to redefine compl_startpos
+		    if (compl_cont_status & CONT_S_IPOS)
+		    {
+			compl_cont_status |= CONT_SOL;
+			compl_startpos.col = (colnr_T)(skipwhite(
+						line + compl_length
+						+ compl_startpos.col) - line);
+		    }
+		    compl_col = compl_startpos.col;
+		}
+		compl_length = curwin->w_cursor.col - (int)compl_col;
+		// IObuff is used to add a "word from the next line" would we
+		// have enough space?  just being paranoid
+#define	MIN_SPACE 75
+		if (compl_length > (IOSIZE - MIN_SPACE))
+		{
+		    compl_cont_status &= ~CONT_SOL;
+		    compl_length = (IOSIZE - MIN_SPACE);
+		    compl_col = curwin->w_cursor.col - compl_length;
+		}
+		compl_cont_status |= CONT_ADDING | CONT_N_ADDS;
+		if (compl_length < 1)
+		    compl_cont_status &= CONT_LOCAL;
+	    }
+	    else if (ctrl_x_mode_line_or_eval())
+		compl_cont_status = CONT_ADDING | CONT_N_ADDS;
+	    else
+		compl_cont_status = 0;
+	}
+	else
+	    compl_cont_status &= CONT_LOCAL;
+
+	if (!(compl_cont_status & CONT_ADDING))	// normal expansion
+	{
+	    compl_cont_mode = ctrl_x_mode;
+	    if (ctrl_x_mode != CTRL_X_NORMAL)
+		// Remove LOCAL if ctrl_x_mode != CTRL_X_NORMAL
+		compl_cont_status = 0;
+	    compl_cont_status |= CONT_N_ADDS;
+	    compl_startpos = curwin->w_cursor;
+	    startcol = (int)curs_col;
+	    compl_col = 0;
+	}
+
+	// Work out completion pattern and original text -- webb
+	if (ctrl_x_mode == CTRL_X_NORMAL || (ctrl_x_mode & CTRL_X_WANT_IDENT))
+	{
+	    if ((compl_cont_status & CONT_SOL)
+		    || ctrl_x_mode == CTRL_X_PATH_DEFINES)
+	    {
+		if (!(compl_cont_status & CONT_ADDING))
+		{
+		    while (--startcol >= 0 && vim_isIDc(line[startcol]))
+			;
+		    compl_col += ++startcol;
+		    compl_length = curs_col - startcol;
+		}
+		if (p_ic)
+		    compl_pattern = str_foldcase(line + compl_col,
+						       compl_length, NULL, 0);
+		else
+		    compl_pattern = vim_strnsave(line + compl_col,
+								compl_length);
+		if (compl_pattern == NULL)
+		    return FAIL;
+	    }
+	    else if (compl_cont_status & CONT_ADDING)
+	    {
+		char_u	    *prefix = (char_u *)"\\<";
+
+		// we need up to 2 extra chars for the prefix
+		compl_pattern = alloc(quote_meta(NULL, line + compl_col,
+							   compl_length) + 2);
+		if (compl_pattern == NULL)
+		    return FAIL;
+		if (!vim_iswordp(line + compl_col)
+			|| (compl_col > 0
+			 && (vim_iswordp(mb_prevptr(line, line + compl_col)))))
+		    prefix = (char_u *)"";
+		STRCPY((char *)compl_pattern, prefix);
+		(void)quote_meta(compl_pattern + STRLEN(prefix),
+					      line + compl_col, compl_length);
+	    }
+	    else if (--startcol < 0
+		    || !vim_iswordp(mb_prevptr(line, line + startcol + 1)))
+	    {
+		// Match any word of at least two chars
+		compl_pattern = vim_strsave((char_u *)"\\<\\k\\k");
+		if (compl_pattern == NULL)
+		    return FAIL;
+		compl_col += curs_col;
+		compl_length = 0;
+	    }
+	    else
+	    {
+		// Search the point of change class of multibyte character
+		// or not a word single byte character backward.
+		if (has_mbyte)
+		{
+		    int base_class;
+		    int head_off;
+
+		    startcol -= (*mb_head_off)(line, line + startcol);
+		    base_class = mb_get_class(line + startcol);
+		    while (--startcol >= 0)
+		    {
+			head_off = (*mb_head_off)(line, line + startcol);
+			if (base_class != mb_get_class(line + startcol
+								  - head_off))
+			    break;
+			startcol -= head_off;
+		    }
+		}
+		else
+		    while (--startcol >= 0 && vim_iswordc(line[startcol]))
+			;
+		compl_col += ++startcol;
+		compl_length = (int)curs_col - startcol;
+		if (compl_length == 1)
+		{
+		    // Only match word with at least two chars -- webb
+		    // there's no need to call quote_meta,
+		    // alloc(7) is enough  -- Acevedo
+		    compl_pattern = alloc(7);
+		    if (compl_pattern == NULL)
+			return FAIL;
+		    STRCPY((char *)compl_pattern, "\\<");
+		    (void)quote_meta(compl_pattern + 2, line + compl_col, 1);
+		    STRCAT((char *)compl_pattern, "\\k");
+		}
+		else
+		{
+		    compl_pattern = alloc(quote_meta(NULL, line + compl_col,
+							   compl_length) + 2);
+		    if (compl_pattern == NULL)
+			return FAIL;
+		    STRCPY((char *)compl_pattern, "\\<");
+		    (void)quote_meta(compl_pattern + 2, line + compl_col,
+								compl_length);
+		}
+	    }
+	}
+	else if (ctrl_x_mode_line_or_eval())
+	{
+	    compl_col = (colnr_T)getwhitecols(line);
+	    compl_length = (int)curs_col - (int)compl_col;
+	    if (compl_length < 0)	// cursor in indent: empty pattern
+		compl_length = 0;
+	    if (p_ic)
+		compl_pattern = str_foldcase(line + compl_col, compl_length,
+								     NULL, 0);
+	    else
+		compl_pattern = vim_strnsave(line + compl_col, compl_length);
+	    if (compl_pattern == NULL)
+		return FAIL;
+	}
+	else if (ctrl_x_mode == CTRL_X_FILES)
+	{
+	    // Go back to just before the first filename character.
+	    if (startcol > 0)
+	    {
+		char_u	*p = line + startcol;
+
+		MB_PTR_BACK(line, p);
+		while (p > line && vim_isfilec(PTR2CHAR(p)))
+		    MB_PTR_BACK(line, p);
+		if (p == line && vim_isfilec(PTR2CHAR(p)))
+		    startcol = 0;
+		else
+		    startcol = (int)(p - line) + 1;
+	    }
+
+	    compl_col += startcol;
+	    compl_length = (int)curs_col - startcol;
+	    compl_pattern = addstar(line + compl_col, compl_length,
+								EXPAND_FILES);
+	    if (compl_pattern == NULL)
+		return FAIL;
+	}
+	else if (ctrl_x_mode == CTRL_X_CMDLINE)
+	{
+	    compl_pattern = vim_strnsave(line, curs_col);
+	    if (compl_pattern == NULL)
+		return FAIL;
+	    set_cmd_context(&compl_xp, compl_pattern,
+				  (int)STRLEN(compl_pattern), curs_col, FALSE);
+	    if (compl_xp.xp_context == EXPAND_UNSUCCESSFUL
+		    || compl_xp.xp_context == EXPAND_NOTHING)
+		// No completion possible, use an empty pattern to get a
+		// "pattern not found" message.
+		compl_col = curs_col;
+	    else
+		compl_col = (int)(compl_xp.xp_pattern - compl_pattern);
+	    compl_length = curs_col - compl_col;
+	}
+	else if (ctrl_x_mode == CTRL_X_FUNCTION || ctrl_x_mode == CTRL_X_OMNI)
+	{
+#ifdef FEAT_COMPL_FUNC
+	    // Call user defined function 'completefunc' with "a:findstart"
+	    // set to 1 to obtain the length of text to use for completion.
+	    typval_T	args[3];
+	    int		col;
+	    char_u	*funcname;
+	    pos_T	pos;
+	    win_T	*curwin_save;
+	    buf_T	*curbuf_save;
+	    int		save_State = State;
+
+	    // Call 'completefunc' or 'omnifunc' and get pattern length as a
+	    // string
+	    funcname = ctrl_x_mode == CTRL_X_FUNCTION
+					  ? curbuf->b_p_cfu : curbuf->b_p_ofu;
+	    if (*funcname == NUL)
+	    {
+		semsg(_(e_notset), ctrl_x_mode == CTRL_X_FUNCTION
+					     ? "completefunc" : "omnifunc");
+		// restore did_ai, so that adding comment leader works
+		did_ai = save_did_ai;
+		return FAIL;
+	    }
+
+	    args[0].v_type = VAR_NUMBER;
+	    args[0].vval.v_number = 1;
+	    args[1].v_type = VAR_STRING;
+	    args[1].vval.v_string = (char_u *)"";
+	    args[2].v_type = VAR_UNKNOWN;
+	    pos = curwin->w_cursor;
+	    curwin_save = curwin;
+	    curbuf_save = curbuf;
+	    col = call_func_retnr(funcname, 2, args);
+
+	    State = save_State;
+	    if (curwin_save != curwin || curbuf_save != curbuf)
+	    {
+		emsg(_(e_complwin));
+		return FAIL;
+	    }
+	    curwin->w_cursor = pos;	// restore the cursor position
+	    validate_cursor();
+	    if (!EQUAL_POS(curwin->w_cursor, pos))
+	    {
+		emsg(_(e_compldel));
+		return FAIL;
+	    }
+
+	    // Return value -2 means the user complete function wants to
+	    // cancel the complete without an error.
+	    // Return value -3 does the same as -2 and leaves CTRL-X mode.
+	    if (col == -2)
+		return FAIL;
+	    if (col == -3)
+	    {
+		ctrl_x_mode = CTRL_X_NORMAL;
+		edit_submode = NULL;
+		if (!shortmess(SHM_COMPLETIONMENU))
+		    msg_clr_cmdline();
+		return FAIL;
+	    }
+
+	    // Reset extended parameters of completion, when start new
+	    // completion.
+	    compl_opt_refresh_always = FALSE;
+	    compl_opt_suppress_empty = FALSE;
+
+	    if (col < 0)
+		col = curs_col;
+	    compl_col = col;
+	    if (compl_col > curs_col)
+		compl_col = curs_col;
+
+	    // Setup variables for completion.  Need to obtain "line" again,
+	    // it may have become invalid.
+	    line = ml_get(curwin->w_cursor.lnum);
+	    compl_length = curs_col - compl_col;
+	    compl_pattern = vim_strnsave(line + compl_col, compl_length);
+	    if (compl_pattern == NULL)
+#endif
+		return FAIL;
+	}
+	else if (ctrl_x_mode == CTRL_X_SPELL)
+	{
+#ifdef FEAT_SPELL
+	    if (spell_bad_len > 0)
+		compl_col = curs_col - spell_bad_len;
+	    else
+		compl_col = spell_word_start(startcol);
+	    if (compl_col >= (colnr_T)startcol)
+	    {
+		compl_length = 0;
+		compl_col = curs_col;
+	    }
+	    else
+	    {
+		spell_expand_check_cap(compl_col);
+		compl_length = (int)curs_col - compl_col;
+	    }
+	    // Need to obtain "line" again, it may have become invalid.
+	    line = ml_get(curwin->w_cursor.lnum);
+	    compl_pattern = vim_strnsave(line + compl_col, compl_length);
+	    if (compl_pattern == NULL)
+#endif
+		return FAIL;
+	}
+	else
+	{
+	    internal_error("ins_complete()");
+	    return FAIL;
+	}
+
+	if (compl_cont_status & CONT_ADDING)
+	{
+	    edit_submode_pre = (char_u *)_(" Adding");
+	    if (ctrl_x_mode_line_or_eval())
+	    {
+		// Insert a new line, keep indentation but ignore 'comments'
+#ifdef FEAT_COMMENTS
+		char_u *old = curbuf->b_p_com;
+
+		curbuf->b_p_com = (char_u *)"";
+#endif
+		compl_startpos.lnum = curwin->w_cursor.lnum;
+		compl_startpos.col = compl_col;
+		ins_eol('\r');
+#ifdef FEAT_COMMENTS
+		curbuf->b_p_com = old;
+#endif
+		compl_length = 0;
+		compl_col = curwin->w_cursor.col;
+	    }
+	}
+	else
+	{
+	    edit_submode_pre = NULL;
+	    compl_startpos.col = compl_col;
+	}
+
+	if (compl_cont_status & CONT_LOCAL)
+	    edit_submode = (char_u *)_(ctrl_x_msgs[CTRL_X_LOCAL_MSG]);
+	else
+	    edit_submode = (char_u *)_(CTRL_X_MSG(ctrl_x_mode));
+
+	// If any of the original typed text has been changed we need to fix
+	// the redo buffer.
+	ins_compl_fixRedoBufForLeader(NULL);
+
+	// Always add completion for the original text.
+	vim_free(compl_orig_text);
+	compl_orig_text = vim_strnsave(line + compl_col, compl_length);
+	if (compl_orig_text == NULL || ins_compl_add(compl_orig_text,
+			-1, p_ic, NULL, NULL, 0, ORIGINAL_TEXT, FALSE) != OK)
+	{
+	    VIM_CLEAR(compl_pattern);
+	    VIM_CLEAR(compl_orig_text);
+	    return FAIL;
+	}
+
+	// showmode might reset the internal line pointers, so it must
+	// be called before line = ml_get(), or when this address is no
+	// longer needed.  -- Acevedo.
+	edit_submode_extra = (char_u *)_("-- Searching...");
+	edit_submode_highl = HLF_COUNT;
+	showmode();
+	edit_submode_extra = NULL;
+	out_flush();
+    }
+    else if (insert_match && stop_arrow() == FAIL)
+	return FAIL;
+
+    compl_shown_match = compl_curr_match;
+    compl_shows_dir = compl_direction;
+
+    // Find next match (and following matches).
+    save_w_wrow = curwin->w_wrow;
+    save_w_leftcol = curwin->w_leftcol;
+    n = ins_compl_next(TRUE, ins_compl_key2count(c), insert_match, FALSE);
+
+    // may undisplay the popup menu
+    ins_compl_upd_pum();
+
+    if (n > 1)		// all matches have been found
+	compl_matches = n;
+    compl_curr_match = compl_shown_match;
+    compl_direction = compl_shows_dir;
+
+    // Eat the ESC that vgetc() returns after a CTRL-C to avoid leaving Insert
+    // mode.
+    if (got_int && !global_busy)
+    {
+	(void)vgetc();
+	got_int = FALSE;
+    }
+
+    // we found no match if the list has only the "compl_orig_text"-entry
+    if (compl_first_match == compl_first_match->cp_next)
+    {
+	edit_submode_extra = (compl_cont_status & CONT_ADDING)
+			&& compl_length > 1
+			     ? (char_u *)_(e_hitend) : (char_u *)_(e_patnotf);
+	edit_submode_highl = HLF_E;
+	// remove N_ADDS flag, so next ^X<> won't try to go to ADDING mode,
+	// because we couldn't expand anything at first place, but if we used
+	// ^P, ^N, ^X^I or ^X^D we might want to add-expand a single-char-word
+	// (such as M in M'exico) if not tried already.  -- Acevedo
+	if (	   compl_length > 1
+		|| (compl_cont_status & CONT_ADDING)
+		|| (ctrl_x_mode != CTRL_X_NORMAL
+		    && ctrl_x_mode != CTRL_X_PATH_PATTERNS
+		    && ctrl_x_mode != CTRL_X_PATH_DEFINES))
+	    compl_cont_status &= ~CONT_N_ADDS;
+    }
+
+    if (compl_curr_match->cp_flags & CONT_S_IPOS)
+	compl_cont_status |= CONT_S_IPOS;
+    else
+	compl_cont_status &= ~CONT_S_IPOS;
+
+    if (edit_submode_extra == NULL)
+    {
+	if (compl_curr_match->cp_flags & ORIGINAL_TEXT)
+	{
+	    edit_submode_extra = (char_u *)_("Back at original");
+	    edit_submode_highl = HLF_W;
+	}
+	else if (compl_cont_status & CONT_S_IPOS)
+	{
+	    edit_submode_extra = (char_u *)_("Word from other line");
+	    edit_submode_highl = HLF_COUNT;
+	}
+	else if (compl_curr_match->cp_next == compl_curr_match->cp_prev)
+	{
+	    edit_submode_extra = (char_u *)_("The only match");
+	    edit_submode_highl = HLF_COUNT;
+	}
+	else
+	{
+	    // Update completion sequence number when needed.
+	    if (compl_curr_match->cp_number == -1)
+	    {
+		int		number = 0;
+		compl_T		*match;
+
+		if (compl_direction == FORWARD)
+		{
+		    // search backwards for the first valid (!= -1) number.
+		    // This should normally succeed already at the first loop
+		    // cycle, so it's fast!
+		    for (match = compl_curr_match->cp_prev; match != NULL
+			    && match != compl_first_match;
+						       match = match->cp_prev)
+			if (match->cp_number != -1)
+			{
+			    number = match->cp_number;
+			    break;
+			}
+		    if (match != NULL)
+			// go up and assign all numbers which are not assigned
+			// yet
+			for (match = match->cp_next;
+				match != NULL && match->cp_number == -1;
+						       match = match->cp_next)
+			    match->cp_number = ++number;
+		}
+		else // BACKWARD
+		{
+		    // search forwards (upwards) for the first valid (!= -1)
+		    // number.  This should normally succeed already at the
+		    // first loop cycle, so it's fast!
+		    for (match = compl_curr_match->cp_next; match != NULL
+			    && match != compl_first_match;
+						       match = match->cp_next)
+			if (match->cp_number != -1)
+			{
+			    number = match->cp_number;
+			    break;
+			}
+		    if (match != NULL)
+			// go down and assign all numbers which are not
+			// assigned yet
+			for (match = match->cp_prev; match
+				&& match->cp_number == -1;
+						       match = match->cp_prev)
+			    match->cp_number = ++number;
+		}
+	    }
+
+	    // The match should always have a sequence number now, this is
+	    // just a safety check.
+	    if (compl_curr_match->cp_number != -1)
+	    {
+		// Space for 10 text chars. + 2x10-digit no.s = 31.
+		// Translations may need more than twice that.
+		static char_u match_ref[81];
+
+		if (compl_matches > 0)
+		    vim_snprintf((char *)match_ref, sizeof(match_ref),
+				_("match %d of %d"),
+				compl_curr_match->cp_number, compl_matches);
+		else
+		    vim_snprintf((char *)match_ref, sizeof(match_ref),
+				_("match %d"),
+				compl_curr_match->cp_number);
+		edit_submode_extra = match_ref;
+		edit_submode_highl = HLF_R;
+		if (dollar_vcol >= 0)
+		    curs_columns(FALSE);
+	    }
+	}
+    }
+
+    // Show a message about what (completion) mode we're in.
+    if (!compl_opt_suppress_empty)
+    {
+	showmode();
+	if (!shortmess(SHM_COMPLETIONMENU))
+	{
+	    if (edit_submode_extra != NULL)
+	    {
+		if (!p_smd)
+		    msg_attr((char *)edit_submode_extra,
+			    edit_submode_highl < HLF_COUNT
+			    ? HL_ATTR(edit_submode_highl) : 0);
+	    }
+	    else
+		msg_clr_cmdline();	// necessary for "noshowmode"
+	}
+    }
+
+    // Show the popup menu, unless we got interrupted.
+    if (enable_pum && !compl_interrupted)
+	show_pum(save_w_wrow, save_w_leftcol);
+
+    compl_was_interrupted = compl_interrupted;
+    compl_interrupted = FALSE;
+
+    return OK;
+}
+
+    static void
+show_pum(int prev_w_wrow, int prev_w_leftcol)
+{
+    // RedrawingDisabled may be set when invoked through complete().
+    int n = RedrawingDisabled;
+
+    RedrawingDisabled = 0;
+
+    // If the cursor moved or the display scrolled we need to remove the pum
+    // first.
+    setcursor();
+    if (prev_w_wrow != curwin->w_wrow || prev_w_leftcol != curwin->w_leftcol)
+	ins_compl_del_pum();
+
+    ins_compl_show_pum();
+    setcursor();
+    RedrawingDisabled = n;
+}
+
+/*
+ * Looks in the first "len" chars. of "src" for search-metachars.
+ * If dest is not NULL the chars. are copied there quoting (with
+ * a backslash) the metachars, and dest would be NUL terminated.
+ * Returns the length (needed) of dest
+ */
+    static unsigned
+quote_meta(char_u *dest, char_u *src, int len)
+{
+    unsigned	m = (unsigned)len + 1;  // one extra for the NUL
+
+    for ( ; --len >= 0; src++)
+    {
+	switch (*src)
+	{
+	    case '.':
+	    case '*':
+	    case '[':
+		if (ctrl_x_mode == CTRL_X_DICTIONARY
+					   || ctrl_x_mode == CTRL_X_THESAURUS)
+		    break;
+		// FALLTHROUGH
+	    case '~':
+		if (!p_magic)	// quote these only if magic is set
+		    break;
+		// FALLTHROUGH
+	    case '\\':
+		if (ctrl_x_mode == CTRL_X_DICTIONARY
+					   || ctrl_x_mode == CTRL_X_THESAURUS)
+		    break;
+		// FALLTHROUGH
+	    case '^':		// currently it's not needed.
+	    case '$':
+		m++;
+		if (dest != NULL)
+		    *dest++ = '\\';
+		break;
+	}
+	if (dest != NULL)
+	    *dest++ = *src;
+	// Copy remaining bytes of a multibyte character.
+	if (has_mbyte)
+	{
+	    int i, mb_len;
+
+	    mb_len = (*mb_ptr2len)(src) - 1;
+	    if (mb_len > 0 && len >= mb_len)
+		for (i = 0; i < mb_len; ++i)
+		{
+		    --len;
+		    ++src;
+		    if (dest != NULL)
+			*dest++ = *src;
+		}
+	}
+    }
+    if (dest != NULL)
+	*dest = NUL;
+
+    return m;
+}
+
+# if defined(EXITFREE) || defined(PROTO)
+    void
+free_insexpand_stuff(void)
+{
+    VIM_CLEAR(compl_orig_text);
+}
+# endif
+
+# ifdef FEAT_SPELL
+/*
+ * Called when starting CTRL_X_SPELL mode: Move backwards to a previous badly
+ * spelled word, if there is one.
+ */
+    static void
+spell_back_to_badword(void)
+{
+    pos_T	tpos = curwin->w_cursor;
+
+    spell_bad_len = spell_move_to(curwin, BACKWARD, TRUE, TRUE, NULL);
+    if (curwin->w_cursor.col != tpos.col)
+	start_arrow(&tpos);
+}
+# endif
+
+#endif // FEAT_INS_EXPAND