--- a/src/if_tcl.c
+++ b/src/if_tcl.c
@@ -1,2120 +1,2120 @@
-/* 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.
- */
-
-/*
- * Tcl extensions by Ingo Wilken <Ingo.Wilken@informatik.uni-oldenburg.de>
- * Last modification: Wed May 10 21:28:44 CEST 2000
- * Requires Tcl 8.0 or higher.
- *
- *  Variables:
- *  ::vim::current(buffer)	# Name of buffer command for current buffer.
- *  ::vim::current(window)	# Name of window command for current window.
- *  ::vim::range(start)		# Start of current range (line number).
- *  ::vim::range(end)		# End of current range (line number).
- *  ::vim::lbase		# Start of line/column numbers (1 or 0).
- *
- *  Commands:
- *  ::vim::command {cmd}	# Execute ex command {cmd}.
- *  ::vim::option {opt} [val]	# Get/Set option {opt}.
- *  ::vim::expr {expr}		# Evaluate {expr} using vim's evaluator.
- *  ::vim::beep			# Guess.
- *
- *  set buf [::vim::buffer {n}]	# Create Tcl command for buffer N.
- *  set bl [::vim::buffer list] # Get list of Tcl commands of all buffers.
- *  ::vim::buffer exists {n}	# True if buffer {n} exists.
- *
- *  set wl [::vim::window list] # Get list of Tcl commands of all windows.
- *
- *  set n [$win height]		# Report window height.
- *  $win height {n}		# Set window height to {n}.
- *  array set pos [$win cursor] # Get cursor position.
- *  $win cursor {row} {col}	# Set cursor position.
- *  $win cursor pos		# Set cursor position from array var "pos"
- *  $win delcmd {cmd}		# Register callback command for closed window.
- *  $win option {opt} [val]	# Get/Set vim option in context of $win.
- *  $win command {cmd}		# Execute ex command in context of $win.
- *  $win expr {expr}		# Evaluate vim expression in context of $win.
- *  set buf [$win buffer]	# Create Tcl command for window's buffer.
- *
- *  $buf name			# Reports file name in buffer.
- *  $buf number			# Reports buffer number.
- *  set l [$buf get {n}]	# Get buffer line {n} as a string.
- *  set L [$buf get {n} {m}]	# Get lines {n} through {m} as a list.
- *  $buf count			# Reports number of lines in buffer.
- *  $buf last			# Reports number of last line in buffer.
- *  $buf delete {n}		# Delete line {n}.
- *  $buf delete {n} {m}		# Delete lines {n} through {m}.
- *  $buf set {n} {l}		# Set line {n} to string {l}.
- *  $buf set {n} {m} {L}	# Set lines {n} through {m} from list {L}.
- *				# Delete/inserts lines as appropriate.
- *  $buf option {opt} [val]	# Get/Set vim option in context of $buf.
- *  $buf command {cmd}		# Execute ex command in context of $buf
- *  $buf expr {cmd}		# Evaluate vim expression in context of $buf.
- *  array set pos [$buf mark {m}]   # Get position of mark.
- *  $buf append {n} {str}	# Append string {str} to buffer,after line {n}.
- *  $buf insert {n} {str}	# Insert string {str} in buffer as line {n}.
- *  $buf delcmd {cmd}		# Register callback command for deleted buffer.
- *  set wl [$buf windows]	# Get list of Tcl commands for all windows of
- *				# this buffer.
-TODO:
- *  ::vim::buffer new		#   create new buffer + Tcl command
- */
-
-#include "vim.h"
-#undef EXTERN			// tcl.h defines it too
-
-#ifdef DYNAMIC_TCL
-# define USE_TCL_STUBS // use tcl's stubs mechanism
-#endif
-
-#include <tcl.h>
-#include <string.h>
-
-typedef struct
-{
-    Tcl_Interp *interp;
-    int exitvalue;
-    int range_start, range_end;
-    int lbase;
-    char *curbuf, *curwin;
-} tcl_info;
-
-static tcl_info tclinfo = { NULL, 0, 0, 0, 0, NULL, NULL };
-
-#define VAR_RANGE1	"::vim::range(start)"
-#define VAR_RANGE2	"::vim::range(begin)"
-#define VAR_RANGE3	"::vim::range(end)"
-#define VAR_CURBUF	"::vim::current(buffer)"
-#define VAR_CURWIN	"::vim::current(window)"
-#define VAR_LBASE	"::vim::lbase"
-#define VAR_CURLINE	"line"
-#define VAR_CURLNUM	"lnum"
-#define VARNAME_SIZE	64
-
-#define row2tcl(x)  ((x) - (tclinfo.lbase==0))
-#define row2vim(x)  ((x) + (tclinfo.lbase==0))
-#define col2tcl(x)  ((x) + (tclinfo.lbase!=0))
-#define col2vim(x)  ((x) - (tclinfo.lbase!=0))
-
-
-#define VIMOUT	((ClientData)1)
-#define VIMERR	((ClientData)2)
-
-// This appears to be new in Tcl 8.4.
-#ifndef CONST84
-# define CONST84
-#endif
-
-/*
- *  List of Tcl interpreters who reference a vim window or buffer.
- *  Each buffer and window has its own list in the w_tcl_ref or b_tcl_ref
- *  struct member.  We need this because Tcl can create sub-interpreters with
- *  the "interp" command, and each interpreter can reference all windows and
- *  buffers.
- */
-struct ref
-{
-    struct ref	*next;
-
-    Tcl_Interp	*interp;
-    Tcl_Command cmd;	    // Tcl command that represents this object
-    Tcl_Obj	*delcmd;    // Tcl command to call when object is being del.
-    void	*vimobj;    // Vim window or buffer (win_T* or buf_T*)
-};
-static char * tclgetbuffer _ANSI_ARGS_((Tcl_Interp *interp, buf_T *buf));
-static char * tclgetwindow _ANSI_ARGS_((Tcl_Interp *interp, win_T *win));
-static int tclsetdelcmd _ANSI_ARGS_((Tcl_Interp *interp, struct ref *reflist, void *vimobj, Tcl_Obj *delcmd));
-static int tclgetlinenum _ANSI_ARGS_ ((Tcl_Interp *interp, Tcl_Obj *obj, int *valueP, buf_T *buf));
-static win_T *tclfindwin _ANSI_ARGS_ ((buf_T *buf));
-static int tcldoexcommand _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
-static int tclsetoption _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
-static int tclvimexpr _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
-static void tcldelthisinterp _ANSI_ARGS_ ((void));
-
-static int vimerror _ANSI_ARGS_((Tcl_Interp *interp));
-static void tclmsg _ANSI_ARGS_((char *text));
-static void tclerrmsg _ANSI_ARGS_((char *text));
-static void tclupdatevars _ANSI_ARGS_((void));
-
-static struct ref refsdeleted;	// dummy object for deleted ref list
-
-//////////////////////////////////////////////////////////////////////////////
-// TCL interface manager
-////////////////////////////////////////////////////////////////////////////
-
-#if defined(DYNAMIC_TCL) || defined(PROTO)
-# ifndef DYNAMIC_TCL_DLL
-#  define DYNAMIC_TCL_DLL "tcl83.dll"
-# endif
-# ifndef DYNAMIC_TCL_VER
-#  define DYNAMIC_TCL_VER "8.3"
-# endif
-
-# ifndef  DYNAMIC_TCL // Just generating prototypes
-typedef int HANDLE;
-# endif
-
-# ifndef MSWIN
-#  include <dlfcn.h>
-#  define HANDLE void*
-#  define TCL_PROC void*
-#  define load_dll(n) dlopen((n), RTLD_LAZY|RTLD_GLOBAL)
-#  define symbol_from_dll dlsym
-#  define close_dll dlclose
-#  define load_dll_error dlerror
-# else
-#  define TCL_PROC FARPROC
-#  define load_dll vimLoadLib
-#  define symbol_from_dll GetProcAddress
-#  define close_dll FreeLibrary
-#  define load_dll_error GetWin32Error
-# endif
-
-/*
- * Declare HANDLE for tcl.dll and function pointers.
- */
-static HANDLE hTclLib = NULL;
-Tcl_Interp* (*dll_Tcl_CreateInterp)();
-void (*dll_Tcl_FindExecutable)(const void *);
-
-/*
- * Table of name to function pointer of tcl.
- */
-static struct {
-    char* name;
-    TCL_PROC* ptr;
-} tcl_funcname_table[] = {
-    {"Tcl_CreateInterp", (TCL_PROC*)&dll_Tcl_CreateInterp},
-    {"Tcl_FindExecutable", (TCL_PROC*)&dll_Tcl_FindExecutable},
-    {NULL, NULL},
-};
-
-/*
- * Make all runtime-links of tcl.
- *
- * 1. Get module handle using LoadLibraryEx.
- * 2. Get pointer to tcl function by GetProcAddress.
- * 3. Repeat 2, until get all functions will be used.
- *
- * Parameter 'libname' provides name of DLL.
- * Return OK or FAIL.
- */
-    static int
-tcl_runtime_link_init(char *libname, int verbose)
-{
-    int i;
-
-    if (hTclLib)
-	return OK;
-    if (!(hTclLib = load_dll(libname)))
-    {
-	if (verbose)
-	    semsg(_(e_could_not_load_library_str_str), libname, load_dll_error());
-	return FAIL;
-    }
-    for (i = 0; tcl_funcname_table[i].ptr; ++i)
-    {
-	if (!(*tcl_funcname_table[i].ptr = symbol_from_dll(hTclLib,
-						  tcl_funcname_table[i].name)))
-	{
-	    close_dll(hTclLib);
-	    hTclLib = NULL;
-	    if (verbose)
-		semsg(_(e_could_not_load_library_function_str),
-						   tcl_funcname_table[i].name);
-	    return FAIL;
-	}
-    }
-    return OK;
-}
-#endif // defined(DYNAMIC_TCL) || defined(PROTO)
-
-#ifdef DYNAMIC_TCL
-static char *find_executable_arg = NULL;
-#endif
-
-    void
-vim_tcl_init(char *arg)
-{
-#ifndef DYNAMIC_TCL
-    Tcl_FindExecutable(arg);
-#else
-    find_executable_arg = arg;
-#endif
-}
-
-#if defined(DYNAMIC_TCL) || defined(PROTO)
-
-static int stubs_initialized = FALSE;
-
-/*
- * Return TRUE if the TCL interface can be used.
- */
-    int
-tcl_enabled(int verbose)
-{
-    if (!stubs_initialized && find_executable_arg != NULL
-	    && tcl_runtime_link_init((char *)p_tcldll, verbose) == OK)
-    {
-	Tcl_Interp *interp;
-
-	// Note: the library will allocate memory to store the executable name,
-	// which will be reported as possibly leaked by valgrind.
-	dll_Tcl_FindExecutable(find_executable_arg);
-
-	if ((interp = dll_Tcl_CreateInterp()) != NULL)
-	{
-	    if (Tcl_InitStubs(interp, DYNAMIC_TCL_VER, 0) != NULL)
-	    {
-		Tcl_DeleteInterp(interp);
-		stubs_initialized = TRUE;
-	    }
-	    // FIXME: When Tcl_InitStubs() was failed, how delete interp?
-	}
-    }
-    return stubs_initialized;
-}
-#endif
-
-#if defined(EXITFREE) || defined(PROTO)
-/*
- * Called once when exiting.
- */
-    void
-vim_tcl_finalize(void)
-{
-# ifdef DYNAMIC_TCL
-    if (stubs_initialized)
-# endif
-	Tcl_Finalize();
-}
-#endif
-
-    void
-tcl_end(void)
-{
-}
-
-/////////////////////////////////////////////////////////////////////////////
-// Tcl commands
-////////////////////////////////////////////////////////////////////////////
-
-/*
- * Replace standard "exit" command.
- *
- * Delete the Tcl interpreter; a new one will be created with the next
- * :tcl command). The exit code is saved (and retrieved in tclexit()).
- * Since Tcl's exit is never expected to return and this replacement
- * does, then (except for a trivial case) additional Tcl commands will
- * be run. Since the interpreter is now marked as deleted, an error
- * will be returned -- typically "attempt to call eval in deleted
- * interpreter". Hopefully, at this point, checks for TCL_ERROR take
- * place and control percolates back up to Vim -- but with this new error
- * string in the interpreter's result value. Therefore it would be
- * useless for this routine to return the exit code via Tcl_SetResult().
- */
-    static int
-exitcmd(
-    ClientData dummy UNUSED,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *CONST objv[])
-{
-    int value = 0;
-
-    switch (objc)
-    {
-	case 2:
-	    if (Tcl_GetIntFromObj(interp, objv[1], &value) != TCL_OK)
-		break;
-	    // FALLTHROUGH
-	case 1:
-	    tclinfo.exitvalue = value;
-
-	    Tcl_DeleteInterp(interp);
-	    break;
-	default:
-	    Tcl_WrongNumArgs(interp, 1, objv, "?returnCode?");
-    }
-    return TCL_ERROR;
-}
-
-/*
- *  "::vim::beep" - what Vi[m] does best :-)
- */
-    static int
-beepcmd(
-    ClientData dummy UNUSED,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *CONST objv[])
-{
-    if (objc != 1)
-    {
-	Tcl_WrongNumArgs(interp, 1, objv, NULL);
-	return TCL_ERROR;
-    }
-    vim_beep(BO_LANG);
-    return TCL_OK;
-}
-
-/*
- *  "::vim::buffer list" - create a list of buffer commands.
- *  "::vim::buffer {N}" - create buffer command for buffer N.
- *  "::vim::buffer exists {N}" - test if buffer N exists.
- *  "::vim::buffer new" - create a new buffer (not implemented)
- */
-    static int
-buffercmd(
-    ClientData dummy UNUSED,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *CONST objv[])
-{
-    char	*name;
-    buf_T	*buf;
-    Tcl_Obj	*resobj;
-    int		err, n, idx;
-    enum {BCMD_EXISTS, BCMD_LIST};
-    static CONST84 char *bcmdoptions[] =
-    {
-	"exists", "list", (char *)0
-    };
-
-    if (objc < 2)
-    {
-	Tcl_WrongNumArgs(interp, 1, objv, "option");
-	return TCL_ERROR;
-    }
-    err = Tcl_GetIntFromObj(interp, objv[1], &n);
-    if (err == TCL_OK)
-    {
-	if (objc != 2)
-	{
-	    Tcl_WrongNumArgs(interp, 1, objv, "bufNumber");
-	    return TCL_ERROR;
-	}
-	FOR_ALL_BUFFERS(buf)
-	{
-	    if (buf->b_fnum == n)
-	    {
-		name = tclgetbuffer(interp, buf);
-		if (name == NULL)
-		    return TCL_ERROR;
-		Tcl_SetResult(interp, name, TCL_VOLATILE);
-		return TCL_OK;
-	    }
-	}
-	Tcl_SetResult(interp, _("invalid buffer number"), TCL_STATIC);
-	return TCL_ERROR;
-    }
-    Tcl_ResetResult(interp); // clear error from Tcl_GetIntFromObj
-
-    err = Tcl_GetIndexFromObj(interp, objv[1], bcmdoptions, "option", 0, &idx);
-    if (err != TCL_OK)
-	return err;
-    switch (idx)
-    {
-	case BCMD_LIST:
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "");
-		err = TCL_ERROR;
-		break;
-	    }
-	    FOR_ALL_BUFFERS(buf)
-	    {
-		name = tclgetbuffer(interp, buf);
-		if (name == NULL)
-		{
-		    err = TCL_ERROR;
-		    break;
-		}
-		Tcl_AppendElement(interp, name);
-	    }
-	    break;
-
-	case BCMD_EXISTS:
-	    if (objc != 3)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "bufNumber");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = Tcl_GetIntFromObj(interp, objv[2], &n);
-	    if (err == TCL_OK)
-	    {
-		buf = buflist_findnr(n);
-		resobj = Tcl_NewIntObj(buf != NULL);
-		Tcl_SetObjResult(interp, resobj);
-	    }
-	    break;
-
-	default:
-	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
-	    err = TCL_ERROR;
-    }
-    return err;
-}
-
-/*
- * "::vim::window list" - create list of window commands.
- */
-    static int
-windowcmd(
-    ClientData	dummy UNUSED,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    char	*what, *string;
-    win_T	*win;
-
-    if (objc != 2)
-    {
-	Tcl_WrongNumArgs(interp, 1, objv, "option");
-	return TCL_ERROR;
-    }
-    what = Tcl_GetStringFromObj(objv[1], NULL);
-    if (strcmp(what, "list") == 0)
-    {
-	FOR_ALL_WINDOWS(win)
-	{
-	    string = tclgetwindow(interp, win);
-	    if (string == NULL)
-		return TCL_ERROR;
-	    Tcl_AppendElement(interp, string);
-	}
-	return TCL_OK;
-    }
-    Tcl_SetResult(interp, _("unknown option"), TCL_STATIC);
-    return TCL_ERROR;
-}
-
-/*
- * flags for bufselfcmd and winselfcmd to indicate outstanding actions.
- */
-#define FL_UPDATE_SCREEN	(1<<0)
-#define FL_UPDATE_CURBUF	(1<<1)
-#define FL_ADJUST_CURSOR	(1<<2)
-
-/*
- * This function implements the buffer commands.
- */
-    static int
-bufselfcmd(
-    ClientData	ref,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    int		opt, err, idx, flags;
-    int		val1, val2, n, i;
-    buf_T	*buf, *savebuf;
-    win_T	*win, *savewin;
-    Tcl_Obj	*resobj;
-    pos_T	*pos;
-    char	*line;
-
-    enum
-    {
-	BUF_APPEND, BUF_COMMAND, BUF_COUNT, BUF_DELCMD, BUF_DELETE, BUF_EXPR,
-	BUF_GET, BUF_INSERT, BUF_LAST, BUF_MARK, BUF_NAME, BUF_NUMBER,
-	BUF_OPTION, BUF_SET, BUF_WINDOWS
-    };
-    static CONST84 char *bufoptions[] =
-    {
-	"append", "command", "count", "delcmd", "delete", "expr",
-	"get", "insert", "last", "mark", "name", "number",
-	"option", "set", "windows", (char *)0
-    };
-
-    if (objc < 2)
-    {
-	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
-	return TCL_ERROR;
-    }
-
-    err = Tcl_GetIndexFromObj(interp, objv[1], bufoptions, "option", 0, &idx);
-    if (err != TCL_OK)
-	return err;
-
-    buf = (buf_T *)((struct ref *)ref)->vimobj;
-    savebuf = curbuf;  curbuf = buf;
-    savewin = curwin;  curwin = tclfindwin(buf);
-    flags = 0;
-    opt = 0;
-
-    switch (idx)
-    {
-	case BUF_COMMAND:
-	    err = tcldoexcommand(interp, objc, objv, 2);
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	case BUF_OPTION:
-	    err = tclsetoption(interp, objc, objv, 2);
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	case BUF_EXPR:
-	    err = tclvimexpr(interp, objc, objv, 2);
-	    break;
-
-	case BUF_NAME:
-	    /*
-	     *	Get filename of buffer.
-	     */
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, NULL);
-		err = TCL_ERROR;
-		break;
-	    }
-	    if (buf->b_ffname)
-		Tcl_SetResult(interp, (char *)buf->b_ffname, TCL_VOLATILE);
-	    else
-		Tcl_SetResult(interp, "", TCL_STATIC);
-	    break;
-
-	case BUF_LAST:
-	    /*
-	     * Get line number of last line.
-	     */
-	    opt = 1;
-	    // fallthrough
-	case BUF_COUNT:
-	    /*
-	     * Get number of lines in buffer.
-	     */
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, NULL);
-		err = TCL_ERROR;
-		break;
-	    }
-	    val1 = (int)buf->b_ml.ml_line_count;
-	    if (opt)
-		val1 = row2tcl(val1);
-
-	    resobj = Tcl_NewIntObj(val1);
-	    Tcl_SetObjResult(interp, resobj);
-	    break;
-
-	case BUF_NUMBER:
-	    /*
-	     * Get buffer's number.
-	     */
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, NULL);
-		err = TCL_ERROR;
-		break;
-	    }
-	    resobj = Tcl_NewIntObj((int)buf->b_fnum);
-	    Tcl_SetObjResult(interp, resobj);
-	    break;
-
-	case BUF_GET:
-	    if (objc != 3 && objc != 4)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "lineNumber ?lineNumber?");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclgetlinenum(interp, objv[2], &val1, buf);
-	    if (err != TCL_OK)
-		break;
-	    if (objc == 4)
-	    {
-		err = tclgetlinenum(interp, objv[3], &val2, buf);
-		if (err != TCL_OK)
-		    break;
-		if (val1 > val2)
-		{
-		    n = val1; val1 = val2; val2 = n;
-		}
-		Tcl_ResetResult(interp);
-
-		for (n = val1; n <= val2 && err == TCL_OK; n++)
-		{
-		    line = (char *)ml_get_buf(buf, (linenr_T)n, FALSE);
-		    if (line)
-			Tcl_AppendElement(interp, line);
-		    else
-			err = TCL_ERROR;
-		}
-	    }
-	    else
-	    {  // objc == 3
-		line = (char *)ml_get_buf(buf, (linenr_T)val1, FALSE);
-		Tcl_SetResult(interp, line, TCL_VOLATILE);
-	    }
-	    break;
-
-	case BUF_SET:
-	    if (objc != 4 && objc != 5)
-	    {
-		Tcl_WrongNumArgs(interp, 3, objv, "lineNumber ?lineNumber? stringOrList");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclgetlinenum(interp, objv[2], &val1, buf);
-	    if (err != TCL_OK)
-		return TCL_ERROR;
-	    if (objc == 4)
-	    {
-		/*
-		 *  Replace one line with a string.
-		 *	$buf set {n} {string}
-		 */
-		line = Tcl_GetStringFromObj(objv[3], NULL);
-		if (u_savesub((linenr_T)val1) != OK)
-		{
-		    Tcl_SetResult(interp, _("cannot save undo information"), TCL_STATIC);
-		    err = TCL_ERROR;
-		}
-		else
-		if (ml_replace((linenr_T)val1, (char_u *)line, TRUE) != OK)
-		{
-		    Tcl_SetResult(interp, _("cannot replace line"), TCL_STATIC);
-		    err = TCL_ERROR;
-		}
-		else
-		{
-		    changed_bytes((linenr_T)val1, 0);
-		    flags |= FL_UPDATE_CURBUF;
-		}
-		break;
-	    }
-	    else
-	    {
-		/*
-		 * Replace several lines with the elements of a Tcl list.
-		 *	$buf set {n} {m} {list}
-		 * If the list contains more than {m}-{n}+1 elements, they
-		 * are * inserted after line {m}.  If the list contains fewer
-		 * elements, * the lines from {n}+length({list}) through {m}
-		 * are deleted.
-		 */
-		int	    lc;
-		Tcl_Obj	    **lv;
-
-		err = tclgetlinenum(interp, objv[3], &val2, buf);
-		if (err != TCL_OK)
-		    break;
-		err = Tcl_ListObjGetElements(interp, objv[4], &lc, &lv);
-		if (err != TCL_OK)
-		    break;
-		if (val1 > val2)
-		{
-		    n = val1;
-		    val1 = val2;
-		    val2 = n;
-		}
-
-		n = val1;
-		if (u_save((linenr_T)(val1 - 1), (linenr_T)(val2 + 1)) != OK)
-		{
-		    Tcl_SetResult(interp, _("cannot save undo information"),
-								  TCL_STATIC);
-		    err = TCL_ERROR;
-		    break;
-		}
-		flags |= FL_UPDATE_CURBUF;
-
-		for (i = 0; i < lc && n <= val2; i++)
-		{
-		    line = Tcl_GetStringFromObj(lv[i], NULL);
-		    if (ml_replace((linenr_T)n, (char_u *)line, TRUE) != OK)
-			goto setListError;
-		    ++n;
-		}
-		if (i < lc)
-		{
-		    // append lines
-		    do
-		    {
-			line = Tcl_GetStringFromObj(lv[i], NULL);
-			if (ml_append((linenr_T)(n - 1),
-					      (char_u *)line, 0, FALSE) != OK)
-			    goto setListError;
-			++n;
-			++i;
-		    } while (i < lc);
-		}
-		else if (n <= val2)
-		{
-		    // did not replace all lines, delete
-		    i = n;
-		    do
-		    {
-			if (ml_delete((linenr_T)i) != OK)
-			    goto setListError;
-			++n;
-		    } while (n <= val2);
-		}
-		lc -= val2 - val1 + 1;	// number of lines to be replaced
-		mark_adjust((linenr_T)val1, (linenr_T)val2, (long)MAXLNUM,
-								    (long)lc);
-		changed_lines((linenr_T)val1, 0, (linenr_T)val2 + 1, (long)lc);
-		break;
-    setListError:
-		u_undo(1);  // ???
-		Tcl_SetResult(interp, _("cannot set line(s)"), TCL_STATIC);
-		err = TCL_ERROR;
-	    }
-	    break;
-
-	case BUF_DELETE:
-	    if (objc != 3  &&  objc != 4)
-	    {
-		Tcl_WrongNumArgs(interp, 3, objv, "lineNumber ?lineNumber?");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclgetlinenum(interp, objv[2], &val1, buf);
-	    if (err != TCL_OK)
-		break;
-	    val2 = val1;
-	    if (objc == 4)
-	    {
-		err = tclgetlinenum(interp, objv[3], &val2, buf);
-		if (err != TCL_OK)
-		    return err;
-		if (val1 > val2)
-		{
-		    i = val1; val1 = val2; val2 = i;
-		}
-	    }
-	    n = val2 - val1 + 1;
-	    if (u_savedel((linenr_T)val1, (long)n) != OK)
-	    {
-		Tcl_SetResult(interp, _("cannot save undo information"),
-								  TCL_STATIC);
-		err = TCL_ERROR;
-		break;
-	    }
-	    for (i = 0; i < n; i++)
-	    {
-		ml_delete((linenr_T)val1);
-		err = vimerror(interp);
-		if (err != TCL_OK)
-		    break;
-	    }
-	    if (i > 0)
-		deleted_lines_mark((linenr_T)val1, (long)i);
-	    flags |= FL_ADJUST_CURSOR|FL_UPDATE_SCREEN;
-	    break;
-
-	case BUF_MARK:
-	    if (objc != 3)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "markName");
-		err = TCL_ERROR;
-		break;
-	    }
-	    line = Tcl_GetStringFromObj(objv[2], NULL);
-
-	    pos = NULL;
-	    if (line[0] != '\0'  &&  line[1] == '\0')
-		pos = getmark(line[0], FALSE);
-	    if (pos == NULL)
-	    {
-		Tcl_SetResult(interp, _("invalid mark name"), TCL_STATIC);
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = vimerror(interp);
-	    if (err != TCL_OK)
-		break;
-	    if (pos->lnum <= 0)
-	    {
-		Tcl_SetResult(interp, _("mark not set"), TCL_STATIC);
-		err = TCL_ERROR;
-	    }
-	    else
-	    {
-		char rbuf[64];
-
-		sprintf(rbuf, _("row %d column %d"),
-			     (int)row2tcl(pos->lnum), (int)col2tcl(pos->col));
-		Tcl_SetResult(interp, rbuf, TCL_VOLATILE);
-	    }
-	    break;
-
-	case BUF_INSERT:
-	    opt = 1;
-	    // fallthrough
-	case BUF_APPEND:
-	    if (objc != 4)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "lineNum text");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclgetlinenum(interp, objv[2], &val1, buf);
-	    if (err != TCL_OK)
-		break;
-	    if (opt)
-		--val1;
-	    if (u_save((linenr_T)val1, (linenr_T)(val1+1)) != OK)
-	    {
-		Tcl_SetResult(interp, _("cannot save undo information"),
-								  TCL_STATIC);
-		err = TCL_ERROR;
-		break;
-	    }
-
-	    line = Tcl_GetStringFromObj(objv[3], NULL);
-	    if (ml_append((linenr_T)val1, (char_u *)line, 0, FALSE) != OK)
-	    {
-		Tcl_SetResult(interp, _("cannot insert/append line"),
-								  TCL_STATIC);
-		err = TCL_ERROR;
-		break;
-	    }
-	    appended_lines_mark((linenr_T)val1, 1L);
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	case BUF_WINDOWS:
-	    /*
-	     * Return list of window commands.
-	     */
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, NULL);
-		err = TCL_ERROR;
-		break;
-	    }
-	    Tcl_ResetResult(interp);
-	    FOR_ALL_WINDOWS(win)
-	    {
-		if (win->w_buffer == buf)
-		{
-		    line = tclgetwindow(interp, win);
-		    if (line != NULL)
-			Tcl_AppendElement(interp, line);
-		    else
-		    {
-			err = TCL_ERROR;
-			break;
-		    }
-		}
-	    }
-	    break;
-
-	case BUF_DELCMD:
-	    /*
-	     * Register deletion callback.
-	     * TODO: Should be able to register multiple callbacks
-	     */
-	    if (objc != 3)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "command");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclsetdelcmd(interp, buf->b_tcl_ref, (void *)buf, objv[2]);
-	    break;
-
-	default:
-	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
-	    err = TCL_ERROR;
-    }
-
-    if (flags & FL_UPDATE_CURBUF)
-	redraw_curbuf_later(UPD_NOT_VALID);
-    curbuf = savebuf;
-    curwin = savewin;
-    if (flags & FL_ADJUST_CURSOR)
-	check_cursor();
-    if (flags & (FL_UPDATE_SCREEN | FL_UPDATE_CURBUF))
-	update_screen(UPD_NOT_VALID);
-
-    return err;
-}
-
-/*
- * This function implements the window commands.
- */
-    static int
-winselfcmd(
-    ClientData	ref,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    int		err, idx, flags;
-    int		val1, val2;
-    Tcl_Obj	*resobj;
-    win_T	*savewin, *win;
-    buf_T	*savebuf;
-    char	*str;
-
-    enum
-    {
-	WIN_BUFFER, WIN_COMMAND, WIN_CURSOR, WIN_DELCMD, WIN_EXPR,
-	WIN_HEIGHT, WIN_OPTION
-    };
-    static CONST84 char *winoptions[] =
-    {
-	"buffer", "command", "cursor", "delcmd", "expr",
-	"height", "option", (char *)0
-    };
-
-    if (objc < 2)
-    {
-	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
-	return TCL_ERROR;
-    }
-
-    err = Tcl_GetIndexFromObj(interp, objv[1], winoptions, "option", 0,  &idx);
-    if (err != TCL_OK)
-	return TCL_ERROR;
-
-    win = (win_T *)((struct ref *)ref)->vimobj;
-    savewin = curwin;  curwin = win;
-    savebuf = curbuf;  curbuf = win->w_buffer;
-    flags = 0;
-
-    switch (idx)
-    {
-	case WIN_OPTION:
-	    err = tclsetoption(interp, objc, objv, 2);
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	case WIN_COMMAND:
-	    err = tcldoexcommand(interp, objc, objv, 2);
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	case WIN_EXPR:
-	    err = tclvimexpr(interp, objc, objv, 2);
-	    break;
-
-	case WIN_HEIGHT:
-	    if (objc == 3)
-	    {
-		err = Tcl_GetIntFromObj(interp, objv[2], &val1);
-		if (err != TCL_OK)
-		    break;
-#ifdef FEAT_GUI
-		need_mouse_correct = TRUE;
-#endif
-		win_setheight(val1);
-		err = vimerror(interp);
-		if (err != TCL_OK)
-		    break;
-	    }
-	    else
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "?value?");
-		err = TCL_ERROR;
-		break;
-	    }
-
-	    resobj = Tcl_NewIntObj((int)(win->w_height));
-	    Tcl_SetObjResult(interp, resobj);
-	    break;
-
-	case WIN_BUFFER:
-	    if (objc != 2)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, NULL);
-		err = TCL_ERROR;
-		break;
-	    }
-	    str = tclgetbuffer(interp, win->w_buffer);
-	    if (str)
-		Tcl_SetResult(interp, str, TCL_VOLATILE);
-	    else
-		err = TCL_ERROR;
-	    break;
-
-	case WIN_DELCMD:
-	    if (objc != 3)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "command");
-		err = TCL_ERROR;
-		break;
-	    }
-	    err = tclsetdelcmd(interp, win->w_tcl_ref, (void *)win, objv[2]);
-	    break;
-
-	case WIN_CURSOR:
-	    if (objc > 4)
-	    {
-		Tcl_WrongNumArgs(interp, 2, objv, "?arg1 ?arg2??");
-		err = TCL_ERROR;
-		break;
-	    }
-	    if (objc == 2)
-	    {
-		char buf[64];
-
-		sprintf(buf, _("row %d column %d"), (int)row2tcl(win->w_cursor.lnum), (int)col2tcl(win->w_cursor.col));
-		Tcl_SetResult(interp, buf, TCL_VOLATILE);
-		break;
-	    }
-	    else if (objc == 3)
-	    {
-		Tcl_Obj *part, *var;
-
-		part = Tcl_NewStringObj("row", -1);
-		var = Tcl_ObjGetVar2(interp, objv[2], part, TCL_LEAVE_ERR_MSG);
-		if (var == NULL)
-		{
-		    err = TCL_ERROR;
-		    break;
-		}
-		err = tclgetlinenum(interp, var, &val1, win->w_buffer);
-		if (err != TCL_OK)
-		    break;
-		part = Tcl_NewStringObj("column", -1);
-		var = Tcl_ObjGetVar2(interp, objv[2], part, TCL_LEAVE_ERR_MSG);
-		if (var == NULL)
-		{
-		    err = TCL_ERROR;
-		    break;
-		}
-		err = Tcl_GetIntFromObj(interp, var, &val2);
-		if (err != TCL_OK)
-		    break;
-	    }
-	    else
-	    {  // objc == 4
-		err = tclgetlinenum(interp, objv[2], &val1, win->w_buffer);
-		if (err != TCL_OK)
-		    break;
-		err = Tcl_GetIntFromObj(interp, objv[3], &val2);
-		if (err != TCL_OK)
-		    break;
-	    }
-	    // TODO: should check column
-	    win->w_cursor.lnum = val1;
-	    win->w_cursor.col = col2vim(val2);
-	    win->w_set_curswant = TRUE;
-	    flags |= FL_UPDATE_SCREEN;
-	    break;
-
-	default:
-	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
-	    break;
-    }
-
-    curwin = savewin;
-    curbuf = savebuf;
-    if (flags & FL_UPDATE_SCREEN)
-	update_screen(UPD_NOT_VALID);
-
-    return err;
-}
-
-
-    static int
-commandcmd(
-    ClientData	dummy UNUSED,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    int		err;
-
-    err = tcldoexcommand(interp, objc, objv, 1);
-    update_screen(UPD_VALID);
-    return err;
-}
-
-    static int
-optioncmd(
-    ClientData	dummy UNUSED,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    int		err;
-
-    err = tclsetoption(interp, objc, objv, 1);
-    update_screen(UPD_VALID);
-    return err;
-}
-
-    static int
-exprcmd(
-    ClientData	dummy UNUSED,
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[])
-{
-    return tclvimexpr(interp, objc, objv, 1);
-}
-
-/////////////////////////////////////////////////////////////////////////////
-// Support functions for Tcl commands
-////////////////////////////////////////////////////////////////////////////
-
-/*
- * Get a line number from 'obj' and convert it to vim's range.
- */
-    static int
-tclgetlinenum(
-    Tcl_Interp	*interp,
-    Tcl_Obj	*obj,
-    int		*valueP,
-    buf_T	*buf)
-{
-    int err, i;
-
-    enum { LN_BEGIN, LN_BOTTOM, LN_END, LN_FIRST, LN_LAST, LN_START, LN_TOP };
-
-    static CONST84 char *keyw[] =
-    {
-	"begin", "bottom", "end", "first", "last", "start", "top", (char *)0
-    };
-
-    err = Tcl_GetIndexFromObj(interp, obj, keyw, "", 0, &i);
-    if (err == TCL_OK)
-    {
-	switch (i)
-	{
-	    case LN_BEGIN:
-	    case LN_FIRST:
-	    case LN_START:
-	    case LN_TOP:
-		*valueP = 1;
-		break;
-	    case LN_BOTTOM:
-	    case LN_END:
-	    case LN_LAST:
-		*valueP = buf->b_ml.ml_line_count;
-		break;
-	}
-	return TCL_OK;
-    }
-    Tcl_ResetResult(interp);
-
-    err = Tcl_GetIntFromObj(interp, obj, &i);
-    if (err != TCL_OK)
-	return err;
-    i = row2vim(i);
-    if (i < 1  ||  i > buf->b_ml.ml_line_count)
-    {
-	Tcl_SetResult(interp, _("line number out of range"), TCL_STATIC);
-	return TCL_ERROR;
-    }
-    *valueP = i;
-    return TCL_OK;
-}
-
-/*
- * Find the first window in the window list that displays the buffer.
- */
-    static win_T *
-tclfindwin(buf_T *buf)
-{
-    win_T *win;
-
-    FOR_ALL_WINDOWS(win)
-    {
-	if (win->w_buffer == buf)
-	    return win;
-    }
-    return curwin;  // keep current window context
-}
-
-/*
- * Do-it-all function for "::vim::command", "$buf command" and "$win command".
- */
-    static int
-tcldoexcommand(
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[],
-    int		objn)
-{
-    tcl_info	saveinfo;
-    int		err, flag, nobjs;
-    char	*arg;
-
-    nobjs = objc - objn;
-    if (nobjs < 1 || nobjs > 2)
-    {
-	Tcl_WrongNumArgs(interp, objn, objv, "?-quiet? exCommand");
-	return TCL_ERROR;
-    }
-
-    flag = 0;
-    if (nobjs == 2)
-    {
-	arg = Tcl_GetStringFromObj(objv[objn], NULL);
-	if (strcmp(arg, "-quiet") == 0)
-	    flag = 1;
-	else
-	{
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, _("unknown flag: "), arg, (char *)0);
-	    return TCL_ERROR;
-	}
-	++objn;
-    }
-
-    memcpy(&saveinfo, &tclinfo, sizeof(tcl_info));
-    tclinfo.interp = NULL;
-    tclinfo.curwin = NULL;
-    tclinfo.curbuf = NULL;
-
-    arg = Tcl_GetStringFromObj(objv[objn], NULL);
-    if (flag)
-	++emsg_off;
-    do_cmdline_cmd((char_u *)arg);
-    if (flag)
-	--emsg_off;
-    err = vimerror(interp);
-
-    // If the ex command created a new Tcl interpreter, remove it
-    if (tclinfo.interp)
-	tcldelthisinterp();
-    memcpy(&tclinfo, &saveinfo, sizeof(tcl_info));
-    tclupdatevars();
-
-    return err;
-}
-
-/*
- * Do-it-all function for "::vim::option", "$buf option" and "$win option".
- */
-    static int
-tclsetoption(
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[],
-    int		objn)
-{
-    int		err, nobjs, idx;
-    char_u	*option;
-    getoption_T	gov;
-    long	lval;
-    char_u	*sval;
-    Tcl_Obj	*resobj;
-
-    enum { OPT_OFF, OPT_ON, OPT_TOGGLE };
-    static CONST84 char *optkw[] = { "off", "on", "toggle", (char *)0 };
-
-    nobjs = objc - objn;
-    if (nobjs != 1 && nobjs != 2)
-    {
-	Tcl_WrongNumArgs(interp, objn, objv, "vimOption ?value?");
-	return TCL_ERROR;
-    }
-
-    option = (char_u *)Tcl_GetStringFromObj(objv[objn], NULL);
-    ++objn;
-    gov = get_option_value(option, &lval, &sval, NULL, 0);
-    err = TCL_OK;
-    switch (gov)
-    {
-	case gov_string:
-	    Tcl_SetResult(interp, (char *)sval, TCL_VOLATILE);
-	    vim_free(sval);
-	    break;
-	case gov_bool:
-	case gov_number:
-	    resobj = Tcl_NewLongObj(lval);
-	    Tcl_SetObjResult(interp, resobj);
-	    break;
-	default:
-	    Tcl_SetResult(interp, _("unknown vimOption"), TCL_STATIC);
-	    return TCL_ERROR;
-    }
-    if (nobjs == 2)
-    {
-	if (gov != gov_string)
-	{
-	    sval = NULL;    // avoid compiler warning
-	    err = Tcl_GetIndexFromObj(interp, objv[objn], optkw, "", 0, &idx);
-	    if (err != TCL_OK)
-	    {
-		Tcl_ResetResult(interp);
-		err = Tcl_GetLongFromObj(interp, objv[objn], &lval);
-	    }
-	    else
-	    {
-		switch (idx)
-		{
-		    case OPT_ON:
-			lval = 1;
-			break;
-		    case OPT_OFF:
-			lval = 0;
-			break;
-		    case OPT_TOGGLE:
-			lval = !lval;
-			break;
-		}
-	    }
-	}
-	else
-	    sval = (char_u *)Tcl_GetStringFromObj(objv[objn], NULL);
-	if (err == TCL_OK)
-	{
-	    set_option_value_give_err(option, lval, sval, OPT_LOCAL);
-	    err = vimerror(interp);
-	}
-    }
-    return err;
-}
-
-/*
- * Do-it-all function for "::vim::expr", "$buf expr" and "$win expr".
- */
-    static int
-tclvimexpr(
-    Tcl_Interp	*interp,
-    int		objc,
-    Tcl_Obj	*CONST objv[],
-    int		objn)
-{
-#ifdef FEAT_EVAL
-    char	*expr, *str;
-#endif
-    int		err;
-
-    if (objc - objn != 1)
-    {
-	Tcl_WrongNumArgs(interp, objn, objv, "vimExpr");
-	return TCL_ERROR;
-    }
-
-#ifdef FEAT_EVAL
-    expr = Tcl_GetStringFromObj(objv[objn], NULL);
-    str = (char *)eval_to_string((char_u *)expr, TRUE, FALSE);
-    if (str == NULL)
-	Tcl_SetResult(interp, _("invalid expression"), TCL_STATIC);
-    else
-    {
-	Tcl_SetResult(interp, str, TCL_VOLATILE);
-	vim_free(str);
-    }
-    err = vimerror(interp);
-#else
-    Tcl_SetResult(interp, _("expressions disabled at compile time"), TCL_STATIC);
-    err = TCL_ERROR;
-#endif
-
-    return err;
-}
-
-/*
- * Check for internal vim errors.
- */
-    static int
-vimerror(Tcl_Interp *interp)
-{
-    if (got_int)
-    {
-	Tcl_SetResult(interp, _("keyboard interrupt"), TCL_STATIC);
-	return TCL_ERROR;
-    }
-    else if (did_emsg)
-    {
-	Tcl_SetResult(interp, _("Vim error"), TCL_STATIC);
-	return TCL_ERROR;
-    }
-    return TCL_OK;
-}
-
-/*
- * Functions that handle the reference lists:
- *   delref() - callback for Tcl's DeleteCommand
- *   tclgetref() - find/create Tcl command for a win_T* or buf_T* object
- *   tclgetwindow() - window frontend for tclgetref()
- *   tclgetbuffer() - buffer frontend for tclgetref()
- *   tclsetdelcmd() - add Tcl callback command to a vim object
- */
-    static void
-delref(ClientData cref)
-{
-    struct ref *ref = (struct ref *)cref;
-
-    if (ref->delcmd)
-    {
-	Tcl_DecrRefCount(ref->delcmd);
-	ref->delcmd = NULL;
-    }
-    ref->interp = NULL;
-}
-
-    static char *
-tclgetref(
-    Tcl_Interp	*interp,
-    void	**refstartP,	// ptr to w_tcl_ref/b_tcl-ref member of
-				// win_T/buf_T struct
-    char	*prefix,	// "win" or "buf"
-    void	*vimobj,	// win_T* or buf_T*
-    Tcl_ObjCmdProc *proc)	// winselfcmd or bufselfcmd
-{
-    struct ref *ref, *unused = NULL;
-    static char name[VARNAME_SIZE];
-    Tcl_Command cmd;
-
-    ref = (struct ref *)(*refstartP);
-    if (ref == &refsdeleted)
-    {
-	Tcl_SetResult(interp, _("cannot create buffer/window command: object is being deleted"), TCL_STATIC);
-	return NULL;
-    }
-
-    while (ref != NULL)
-    {
-	if (ref->interp == interp)
-	    break;
-	if (ref->interp == NULL)
-	    unused = ref;
-	ref = ref->next;
-    }
-
-    if (ref)
-	vim_snprintf(name, sizeof(name), "::vim::%s",
-					Tcl_GetCommandName(interp, ref->cmd));
-    else
-    {
-	if (unused)
-	    ref = unused;
-	else
-	{
-	    ref = (struct ref *)Tcl_Alloc(sizeof(struct ref));
-	    ref->interp = NULL;
-	    ref->next = (struct ref *)(*refstartP);
-	    (*refstartP) = (void *)ref;
-	}
-
-	// This might break on some exotic systems...
-	vim_snprintf(name, sizeof(name), "::vim::%s_%lx",
-					       prefix, (unsigned long)vimobj);
-	cmd = Tcl_CreateObjCommand(interp, name, proc,
-	    (ClientData)ref, (Tcl_CmdDeleteProc *)delref);
-	if (!cmd)
-	    return NULL;
-
-	ref->interp = interp;
-	ref->cmd = cmd;
-	ref->delcmd = NULL;
-	ref->vimobj = vimobj;
-    }
-    return name;
-}
-
-    static char *
-tclgetwindow(Tcl_Interp *interp, win_T *win)
-{
-    return tclgetref(interp, &(win->w_tcl_ref), "win", (void *)win, winselfcmd);
-}
-
-    static char *
-tclgetbuffer(Tcl_Interp *interp, buf_T *buf)
-{
-    return tclgetref(interp, &(buf->b_tcl_ref), "buf", (void *)buf, bufselfcmd);
-}
-
-    static int
-tclsetdelcmd(
-    Tcl_Interp	*interp,
-    struct ref	*reflist,
-    void	*vimobj,
-    Tcl_Obj	*delcmd)
-{
-    if (reflist == &refsdeleted)
-    {
-	Tcl_SetResult(interp, _("cannot register callback command: buffer/window is already being deleted"), TCL_STATIC);
-	return TCL_ERROR;
-    }
-
-    while (reflist != NULL)
-    {
-	if (reflist->interp == interp && reflist->vimobj == vimobj)
-	{
-	    if (reflist->delcmd)
-		Tcl_DecrRefCount(reflist->delcmd);
-	    Tcl_IncrRefCount(delcmd);
-	    reflist->delcmd = delcmd;
-	    return TCL_OK;
-	}
-	reflist = reflist->next;
-    }
-    // This should never happen.  Famous last word?
-    iemsg(e_tcl_fatal_error_reflist_corrupt_please_report_this);
-    Tcl_SetResult(interp, _("cannot register callback command: buffer/window reference not found"), TCL_STATIC);
-    return TCL_ERROR;
-}
-
-
-////////////////////////////////////////////
-//    I/O Channel
-////////////////////////////////////////////
-
-    static int
-tcl_channel_close(ClientData instance, Tcl_Interp *interp UNUSED)
-{
-    int		err = 0;
-
-    // currently does nothing
-
-    if (instance != VIMOUT && instance != VIMERR)
-    {
-	Tcl_SetErrno(EBADF);
-	err = EBADF;
-    }
-    return err;
-}
-
-    static int
-tcl_channel_input(
-    ClientData	instance UNUSED,
-    char	*buf UNUSED,
-    int		bufsiz UNUSED,
-    int		*errptr)
-{
-
-    // input is currently not supported
-
-    Tcl_SetErrno(EINVAL);
-    if (errptr)
-	*errptr = EINVAL;
-    return -1;
-}
-
-    static int
-tcl_channel_output(
-    ClientData	instance,
-    const char	*buf,
-    int		bufsiz,
-    int		*errptr)
-{
-    char_u	*str;
-    int		result;
-
-    // The buffer is not guaranteed to be 0-terminated, and we don't if
-    // there is enough room to add a '\0'.  So we have to create a copy
-    // of the buffer...
-    str = vim_strnsave((char_u *)buf, bufsiz);
-    if (!str)
-    {
-	Tcl_SetErrno(ENOMEM);
-	if (errptr)
-	    *errptr = ENOMEM;
-	return -1;
-    }
-
-    result = bufsiz;
-    if (instance == VIMOUT)
-	tclmsg((char *)str);
-    else
-    if (instance == VIMERR)
-	tclerrmsg((char *)str);
-    else
-    {
-	Tcl_SetErrno(EBADF);
-	if (errptr)
-	    *errptr = EBADF;
-	result = -1;
-    }
-    vim_free(str);
-    return result;
-}
-
-    static void
-tcl_channel_watch(ClientData instance UNUSED, int mask UNUSED)
-{
-    Tcl_SetErrno(EINVAL);
-}
-
-    static int
-tcl_channel_gethandle(
-    ClientData	instance UNUSED,
-    int		direction UNUSED,
-    ClientData	*handleptr UNUSED)
-{
-    Tcl_SetErrno(EINVAL);
-    return EINVAL;
-}
-
-
-static Tcl_ChannelType tcl_channel_type =
-{
-    "vimmessage",	// typeName
-    TCL_CHANNEL_VERSION_2, // version
-    tcl_channel_close,	// closeProc
-    tcl_channel_input,	// inputProc
-    tcl_channel_output,	// outputProc
-    NULL,		// seekProc
-    NULL,		// setOptionProc
-    NULL,		// getOptionProc
-    tcl_channel_watch,	// watchProc
-    tcl_channel_gethandle, // getHandleProc
-    NULL,		// close2Proc
-    NULL,		// blockModeProc
-#ifdef TCL_CHANNEL_VERSION_2
-    NULL,		// flushProc
-    NULL,		// handlerProc
-#endif
-// The following should not be necessary since TCL_CHANNEL_VERSION_2 was
-// set above
-#ifdef TCL_CHANNEL_VERSION_3
-    NULL,		// wideSeekProc
-#endif
-#ifdef TCL_CHANNEL_VERSION_4
-    NULL,		// threadActionProc
-#endif
-#ifdef TCL_CHANNEL_VERSION_5
-    NULL		// truncateProc
-#endif
-};
-
-///////////////////////////////////
-// Interface to vim
-//////////////////////////////////
-
-    static void
-tclupdatevars(void)
-{
-    char varname[VARNAME_SIZE];	// must be writeable
-    char *name;
-
-    strcpy(varname, VAR_RANGE1);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-    strcpy(varname, VAR_RANGE2);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-    strcpy(varname, VAR_RANGE3);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-
-    strcpy(varname, VAR_LBASE);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-
-    name = tclgetbuffer(tclinfo.interp, curbuf);
-    strcpy(tclinfo.curbuf, name);
-    strcpy(varname, VAR_CURBUF);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-
-    name = tclgetwindow(tclinfo.interp, curwin);
-    strcpy(tclinfo.curwin, name);
-    strcpy(varname, VAR_CURWIN);
-    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
-}
-
-
-    static int
-tclinit(exarg_T *eap)
-{
-    char varname[VARNAME_SIZE];	// Tcl_LinkVar requires writeable varname
-    char *name;
-
-#ifdef DYNAMIC_TCL
-    if (!tcl_enabled(TRUE))
-    {
-	emsg(_(e_sorry_this_command_is_disabled_tcl_library_could_not_be_loaded));
-	return FAIL;
-    }
-#endif
-
-    if (!tclinfo.interp)
-    {
-	Tcl_Interp *interp;
-	static Tcl_Channel ch1, ch2;
-
-	// Create replacement channels for stdout and stderr; this has to be
-	// done each time an interpreter is created since the channels are closed
-	// when the interpreter is deleted
-	ch1 = Tcl_CreateChannel(&tcl_channel_type, "vimout", VIMOUT, TCL_WRITABLE);
-	ch2 = Tcl_CreateChannel(&tcl_channel_type, "vimerr", VIMERR, TCL_WRITABLE);
-	Tcl_SetStdChannel(ch1, TCL_STDOUT);
-	Tcl_SetStdChannel(ch2, TCL_STDERR);
-
-	interp = Tcl_CreateInterp();
-	Tcl_Preserve(interp);
-	if (Tcl_Init(interp) == TCL_ERROR)
-	{
-	    Tcl_Release(interp);
-	    Tcl_DeleteInterp(interp);
-	    return FAIL;
-	}
-#if 0
-	// VIM sure is interactive
-	Tcl_SetVar(interp, "tcl_interactive", "1", TCL_GLOBAL_ONLY);
-#endif
-
-	Tcl_SetChannelOption(interp, ch1, "-buffering", "line");
-#ifdef MSWIN
-	Tcl_SetChannelOption(interp, ch1, "-translation", "lf");
-#endif
-	Tcl_SetChannelOption(interp, ch2, "-buffering", "line");
-#ifdef MSWIN
-	Tcl_SetChannelOption(interp, ch2, "-translation", "lf");
-#endif
-
-	// replace standard Tcl exit command
-	Tcl_DeleteCommand(interp, "exit");
-	Tcl_CreateObjCommand(interp, "exit", exitcmd,
-	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-
-	// new commands, in ::vim namespace
-	Tcl_CreateObjCommand(interp, "::vim::buffer", buffercmd,
-	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_CreateObjCommand(interp, "::vim::window", windowcmd,
-	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_CreateObjCommand(interp, "::vim::command", commandcmd,
-	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_CreateObjCommand(interp, "::vim::beep", beepcmd,
-	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_CreateObjCommand(interp, "::vim::option", optioncmd,
-	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_CreateObjCommand(interp, "::vim::expr", exprcmd,
-	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-
-	// "lbase" variable
-	tclinfo.lbase = 1;
-	strcpy(varname, VAR_LBASE);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.lbase, TCL_LINK_INT);
-
-	// "range" variable
-	tclinfo.range_start = eap->line1;
-	strcpy(varname, VAR_RANGE1);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_start, TCL_LINK_INT|TCL_LINK_READ_ONLY);
-	strcpy(varname, VAR_RANGE2);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_start, TCL_LINK_INT|TCL_LINK_READ_ONLY);
-	tclinfo.range_end   = eap->line2;
-	strcpy(varname, VAR_RANGE3);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_end, TCL_LINK_INT|TCL_LINK_READ_ONLY);
-
-	// "current" variable
-	tclinfo.curbuf = Tcl_Alloc(VARNAME_SIZE);
-	tclinfo.curwin = Tcl_Alloc(VARNAME_SIZE);
-	name = tclgetbuffer(interp, curbuf);
-	strcpy(tclinfo.curbuf, name);
-	strcpy(varname, VAR_CURBUF);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.curbuf, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
-	name = tclgetwindow(interp, curwin);
-	strcpy(tclinfo.curwin, name);
-	strcpy(varname, VAR_CURWIN);
-	Tcl_LinkVar(interp, varname, (char *)&tclinfo.curwin, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
-
-	tclinfo.interp = interp;
-    }
-    else
-    {
-	// Interpreter already exists, just update variables
-	tclinfo.range_start = row2tcl(eap->line1);
-	tclinfo.range_end = row2tcl(eap->line2);
-	tclupdatevars();
-    }
-
-    tclinfo.exitvalue = 0;
-    return OK;
-}
-
-    static void
-tclerrmsg(char *text)
-{
-    char *next;
-
-    while ((next=strchr(text, '\n')))
-    {
-	*next++ = '\0';
-	emsg(text);
-	text = next;
-    }
-    if (*text)
-	emsg(text);
-}
-
-    static void
-tclmsg(char *text)
-{
-    char *next;
-
-    while ((next=strchr(text, '\n')))
-    {
-	*next++ = '\0';
-	msg(text);
-	text = next;
-    }
-    if (*text)
-	msg(text);
-}
-
-    static void
-tcldelthisinterp(void)
-{
-    if (!Tcl_InterpDeleted(tclinfo.interp))
-	Tcl_DeleteInterp(tclinfo.interp);
-    Tcl_Release(tclinfo.interp);
-    // The interpreter is now gets deleted.  All registered commands (esp.
-    // window and buffer commands) are deleted, triggering their deletion
-    // callback, which deletes all refs pointing to this interpreter.
-    // We could garbage-collect the unused ref structs in all windows and
-    // buffers, but unless the user creates hundreds of sub-interpreters
-    // all referring to lots of windows and buffers, this is hardly worth
-    // the effort.  Unused refs are recycled by other interpreters, and
-    // all refs are free'd when the window/buffer gets closed by vim.
-
-    tclinfo.interp = NULL;
-    Tcl_Free(tclinfo.curbuf);
-    Tcl_Free(tclinfo.curwin);
-    tclinfo.curbuf = tclinfo.curwin = NULL;
-}
-
-    static int
-tclexit(int error)
-{
-    int newerr = OK;
-
-    if (Tcl_InterpDeleted(tclinfo.interp)     // True if we intercepted Tcl's exit command
-#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
-	|| Tcl_LimitExceeded(tclinfo.interp)  // True if the interpreter cannot continue
-#endif
-	)
-    {
-	char buf[50];
-
-	sprintf(buf, _(e_exit_code_nr), tclinfo.exitvalue);
-	tclerrmsg(buf);
-	if (tclinfo.exitvalue == 0)
-	{
-	    did_emsg = 0;
-	    newerr = OK;
-	}
-	else
-	    newerr = FAIL;
-
-	tcldelthisinterp();
-    }
-    else
-    {
-	char *result;
-
-	result = (char *)Tcl_GetStringResult(tclinfo.interp);
-	if (error == TCL_OK)
-	{
-	    tclmsg(result);
-	    newerr = OK;
-	}
-	else
-	{
-	    tclerrmsg(result);
-	    newerr = FAIL;
-	}
-    }
-
-    return newerr;
-}
-
-/*
- * ":tcl"
- */
-    void
-ex_tcl(exarg_T *eap)
-{
-    char_u	*script;
-    int		err;
-
-    script = script_get(eap, eap->arg);
-    if (!eap->skip)
-    {
-	err = tclinit(eap);
-	if (err == OK)
-	{
-	    Tcl_AllowExceptions(tclinfo.interp);
-	    if (script == NULL)
-		err = Tcl_Eval(tclinfo.interp, (char *)eap->arg);
-	    else
-		err = Tcl_Eval(tclinfo.interp, (char *)script);
-	    err = tclexit(err);
-	}
-    }
-    vim_free(script);
-}
-
-/*
- * ":tclfile"
- */
-    void
-ex_tclfile(exarg_T *eap)
-{
-    char *file = (char *)eap->arg;
-    int err;
-
-    err = tclinit(eap);
-    if (err == OK)
-    {
-	Tcl_AllowExceptions(tclinfo.interp);
-	err = Tcl_EvalFile(tclinfo.interp, file);
-	err = tclexit(err);
-    }
-}
-
-/*
- * ":tcldo"
- */
-    void
-ex_tcldo(exarg_T *eap)
-{
-    char	*script, *line;
-    int		err, rs, re, lnum;
-    char	var_lnum[VARNAME_SIZE]; // must be writeable memory
-    char	var_line[VARNAME_SIZE];
-    linenr_T	first_line = 0;
-    linenr_T	last_line = 0;
-    buf_T	*was_curbuf = curbuf;
-
-    rs = eap->line1;
-    re = eap->line2;
-    script = (char *)eap->arg;
-    strcpy(var_lnum, VAR_CURLNUM);
-    strcpy(var_line, VAR_CURLINE);
-
-    err = tclinit(eap);
-    if (err != OK)
-	return;
-
-    lnum = row2tcl(rs);
-    Tcl_LinkVar(tclinfo.interp, var_lnum, (char *)&lnum, TCL_LINK_INT|TCL_LINK_READ_ONLY);
-    err = TCL_OK;
-    if (u_save((linenr_T)(rs-1), (linenr_T)(re+1)) != OK)
-    {
-	Tcl_SetResult(tclinfo.interp, _("cannot save undo information"), TCL_STATIC);
-	err = TCL_ERROR;
-    }
-    while (err == TCL_OK  &&  rs <= re)
-    {
-	if ((linenr_T)rs > curbuf->b_ml.ml_line_count)
-	    break;
-	line = (char *)ml_get_buf(curbuf, (linenr_T)rs, FALSE);
-	if (!line)
-	{
-	    Tcl_SetResult(tclinfo.interp, _("cannot get line"), TCL_STATIC);
-	    err = TCL_ERROR;
-	    break;
-	}
-	Tcl_SetVar(tclinfo.interp, var_line, line, 0);
-	Tcl_AllowExceptions(tclinfo.interp);
-	err = Tcl_Eval(tclinfo.interp, script);
-	if (err != TCL_OK
-	    || Tcl_InterpDeleted(tclinfo.interp)
-#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
-	    || Tcl_LimitExceeded(tclinfo.interp)
-#endif
-	    || curbuf != was_curbuf)
-	    break;
-	line = (char *)Tcl_GetVar(tclinfo.interp, var_line, 0);
-	if (line)
-	{
-	    if (ml_replace((linenr_T)rs, (char_u *)line, TRUE) != OK)
-	    {
-		Tcl_SetResult(tclinfo.interp, _("cannot replace line"), TCL_STATIC);
-		err = TCL_ERROR;
-		break;
-	    }
-	    if (first_line == 0)
-		first_line = rs;
-	    last_line = rs;
-	}
-	++rs;
-	++lnum;
-	Tcl_UpdateLinkedVar(tclinfo.interp, var_lnum);
-    }
-    if (first_line)
-	changed_lines(first_line, 0, last_line + 1, (long)0);
-
-    Tcl_UnsetVar(tclinfo.interp, var_line, 0);
-    Tcl_UnlinkVar(tclinfo.interp, var_lnum);
-    if (err == TCL_OK)
-	Tcl_ResetResult(tclinfo.interp);
-
-    (void)tclexit(err);
-}
-
-    static void
-tcldelallrefs(struct ref *ref)
-{
-    struct ref	*next;
-    int		err;
-    char	*result;
-
-#ifdef DYNAMIC_TCL
-    // TODO: this code currently crashes Vim on exit
-    if (exiting)
-	return;
-#endif
-
-    while (ref != NULL)
-    {
-	next = ref->next;
-	if (ref->interp)
-	{
-	    if (ref->delcmd)
-	    {
-		err = Tcl_GlobalEvalObj(ref->interp, ref->delcmd);
-		if (err != TCL_OK)
-		{
-		    result = (char *)Tcl_GetStringResult(ref->interp);
-		    if (result)
-			tclerrmsg(result);
-		}
-		Tcl_DecrRefCount(ref->delcmd);
-		ref->delcmd = NULL;
-	    }
-	    Tcl_DeleteCommandFromToken(ref->interp, ref->cmd);
-	}
-	Tcl_Free((char *)ref);
-	ref = next;
-    }
-}
-
-    void
-tcl_buffer_free(buf_T *buf)
-{
-    struct ref *reflist;
-
-#ifdef DYNAMIC_TCL
-    if (!stubs_initialized)	// Not using Tcl, nothing to do.
-	return;
-#endif
-
-    reflist = (struct ref *)(buf->b_tcl_ref);
-    if (reflist != &refsdeleted)
-    {
-	buf->b_tcl_ref = (void *)&refsdeleted;
-	tcldelallrefs(reflist);
-	buf->b_tcl_ref = NULL;
-    }
-}
-
-    void
-tcl_window_free(win_T *win)
-{
-    struct ref *reflist;
-
-#ifdef DYNAMIC_TCL
-    if (!stubs_initialized)	// Not using Tcl, nothing to do.
-	return;
-#endif
-
-    reflist = (struct ref*)(win->w_tcl_ref);
-    if (reflist != &refsdeleted)
-    {
-	win->w_tcl_ref = (void *)&refsdeleted;
-	tcldelallrefs(reflist);
-	win->w_tcl_ref = NULL;
-    }
-}
-
-// The End
+/* 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.
+ */
+
+/*
+ * Tcl extensions by Ingo Wilken <Ingo.Wilken@informatik.uni-oldenburg.de>
+ * Last modification: Wed May 10 21:28:44 CEST 2000
+ * Requires Tcl 8.0 or higher.
+ *
+ *  Variables:
+ *  ::vim::current(buffer)	# Name of buffer command for current buffer.
+ *  ::vim::current(window)	# Name of window command for current window.
+ *  ::vim::range(start)		# Start of current range (line number).
+ *  ::vim::range(end)		# End of current range (line number).
+ *  ::vim::lbase		# Start of line/column numbers (1 or 0).
+ *
+ *  Commands:
+ *  ::vim::command {cmd}	# Execute ex command {cmd}.
+ *  ::vim::option {opt} [val]	# Get/Set option {opt}.
+ *  ::vim::expr {expr}		# Evaluate {expr} using vim's evaluator.
+ *  ::vim::beep			# Guess.
+ *
+ *  set buf [::vim::buffer {n}]	# Create Tcl command for buffer N.
+ *  set bl [::vim::buffer list] # Get list of Tcl commands of all buffers.
+ *  ::vim::buffer exists {n}	# True if buffer {n} exists.
+ *
+ *  set wl [::vim::window list] # Get list of Tcl commands of all windows.
+ *
+ *  set n [$win height]		# Report window height.
+ *  $win height {n}		# Set window height to {n}.
+ *  array set pos [$win cursor] # Get cursor position.
+ *  $win cursor {row} {col}	# Set cursor position.
+ *  $win cursor pos		# Set cursor position from array var "pos"
+ *  $win delcmd {cmd}		# Register callback command for closed window.
+ *  $win option {opt} [val]	# Get/Set vim option in context of $win.
+ *  $win command {cmd}		# Execute ex command in context of $win.
+ *  $win expr {expr}		# Evaluate vim expression in context of $win.
+ *  set buf [$win buffer]	# Create Tcl command for window's buffer.
+ *
+ *  $buf name			# Reports file name in buffer.
+ *  $buf number			# Reports buffer number.
+ *  set l [$buf get {n}]	# Get buffer line {n} as a string.
+ *  set L [$buf get {n} {m}]	# Get lines {n} through {m} as a list.
+ *  $buf count			# Reports number of lines in buffer.
+ *  $buf last			# Reports number of last line in buffer.
+ *  $buf delete {n}		# Delete line {n}.
+ *  $buf delete {n} {m}		# Delete lines {n} through {m}.
+ *  $buf set {n} {l}		# Set line {n} to string {l}.
+ *  $buf set {n} {m} {L}	# Set lines {n} through {m} from list {L}.
+ *				# Delete/inserts lines as appropriate.
+ *  $buf option {opt} [val]	# Get/Set vim option in context of $buf.
+ *  $buf command {cmd}		# Execute ex command in context of $buf
+ *  $buf expr {cmd}		# Evaluate vim expression in context of $buf.
+ *  array set pos [$buf mark {m}]   # Get position of mark.
+ *  $buf append {n} {str}	# Append string {str} to buffer,after line {n}.
+ *  $buf insert {n} {str}	# Insert string {str} in buffer as line {n}.
+ *  $buf delcmd {cmd}		# Register callback command for deleted buffer.
+ *  set wl [$buf windows]	# Get list of Tcl commands for all windows of
+ *				# this buffer.
+TODO:
+ *  ::vim::buffer new		#   create new buffer + Tcl command
+ */
+
+#include "vim.h"
+#undef EXTERN			// tcl.h defines it too
+
+#ifdef DYNAMIC_TCL
+# define USE_TCL_STUBS // use tcl's stubs mechanism
+#endif
+
+#include <tcl.h>
+#include <string.h>
+
+typedef struct
+{
+    Tcl_Interp *interp;
+    int exitvalue;
+    int range_start, range_end;
+    int lbase;
+    char *curbuf, *curwin;
+} tcl_info;
+
+static tcl_info tclinfo = { NULL, 0, 0, 0, 0, NULL, NULL };
+
+#define VAR_RANGE1	"::vim::range(start)"
+#define VAR_RANGE2	"::vim::range(begin)"
+#define VAR_RANGE3	"::vim::range(end)"
+#define VAR_CURBUF	"::vim::current(buffer)"
+#define VAR_CURWIN	"::vim::current(window)"
+#define VAR_LBASE	"::vim::lbase"
+#define VAR_CURLINE	"line"
+#define VAR_CURLNUM	"lnum"
+#define VARNAME_SIZE	64
+
+#define row2tcl(x)  ((x) - (tclinfo.lbase==0))
+#define row2vim(x)  ((x) + (tclinfo.lbase==0))
+#define col2tcl(x)  ((x) + (tclinfo.lbase!=0))
+#define col2vim(x)  ((x) - (tclinfo.lbase!=0))
+
+
+#define VIMOUT	((ClientData)1)
+#define VIMERR	((ClientData)2)
+
+// This appears to be new in Tcl 8.4.
+#ifndef CONST84
+# define CONST84
+#endif
+
+/*
+ *  List of Tcl interpreters who reference a vim window or buffer.
+ *  Each buffer and window has its own list in the w_tcl_ref or b_tcl_ref
+ *  struct member.  We need this because Tcl can create sub-interpreters with
+ *  the "interp" command, and each interpreter can reference all windows and
+ *  buffers.
+ */
+struct ref
+{
+    struct ref	*next;
+
+    Tcl_Interp	*interp;
+    Tcl_Command cmd;	    // Tcl command that represents this object
+    Tcl_Obj	*delcmd;    // Tcl command to call when object is being del.
+    void	*vimobj;    // Vim window or buffer (win_T* or buf_T*)
+};
+static char * tclgetbuffer _ANSI_ARGS_((Tcl_Interp *interp, buf_T *buf));
+static char * tclgetwindow _ANSI_ARGS_((Tcl_Interp *interp, win_T *win));
+static int tclsetdelcmd _ANSI_ARGS_((Tcl_Interp *interp, struct ref *reflist, void *vimobj, Tcl_Obj *delcmd));
+static int tclgetlinenum _ANSI_ARGS_ ((Tcl_Interp *interp, Tcl_Obj *obj, int *valueP, buf_T *buf));
+static win_T *tclfindwin _ANSI_ARGS_ ((buf_T *buf));
+static int tcldoexcommand _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
+static int tclsetoption _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
+static int tclvimexpr _ANSI_ARGS_ ((Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[], int objn));
+static void tcldelthisinterp _ANSI_ARGS_ ((void));
+
+static int vimerror _ANSI_ARGS_((Tcl_Interp *interp));
+static void tclmsg _ANSI_ARGS_((char *text));
+static void tclerrmsg _ANSI_ARGS_((char *text));
+static void tclupdatevars _ANSI_ARGS_((void));
+
+static struct ref refsdeleted;	// dummy object for deleted ref list
+
+//////////////////////////////////////////////////////////////////////////////
+// TCL interface manager
+////////////////////////////////////////////////////////////////////////////
+
+#if defined(DYNAMIC_TCL) || defined(PROTO)
+# ifndef DYNAMIC_TCL_DLL
+#  define DYNAMIC_TCL_DLL "tcl83.dll"
+# endif
+# ifndef DYNAMIC_TCL_VER
+#  define DYNAMIC_TCL_VER "8.3"
+# endif
+
+# ifndef  DYNAMIC_TCL // Just generating prototypes
+typedef int HANDLE;
+# endif
+
+# ifndef MSWIN
+#  include <dlfcn.h>
+#  define HANDLE void*
+#  define TCL_PROC void*
+#  define load_dll(n) dlopen((n), RTLD_LAZY|RTLD_GLOBAL)
+#  define symbol_from_dll dlsym
+#  define close_dll dlclose
+#  define load_dll_error dlerror
+# else
+#  define TCL_PROC FARPROC
+#  define load_dll vimLoadLib
+#  define symbol_from_dll GetProcAddress
+#  define close_dll FreeLibrary
+#  define load_dll_error GetWin32Error
+# endif
+
+/*
+ * Declare HANDLE for tcl.dll and function pointers.
+ */
+static HANDLE hTclLib = NULL;
+Tcl_Interp* (*dll_Tcl_CreateInterp)();
+void (*dll_Tcl_FindExecutable)(const void *);
+
+/*
+ * Table of name to function pointer of tcl.
+ */
+static struct {
+    char* name;
+    TCL_PROC* ptr;
+} tcl_funcname_table[] = {
+    {"Tcl_CreateInterp", (TCL_PROC*)&dll_Tcl_CreateInterp},
+    {"Tcl_FindExecutable", (TCL_PROC*)&dll_Tcl_FindExecutable},
+    {NULL, NULL},
+};
+
+/*
+ * Make all runtime-links of tcl.
+ *
+ * 1. Get module handle using LoadLibraryEx.
+ * 2. Get pointer to tcl function by GetProcAddress.
+ * 3. Repeat 2, until get all functions will be used.
+ *
+ * Parameter 'libname' provides name of DLL.
+ * Return OK or FAIL.
+ */
+    static int
+tcl_runtime_link_init(char *libname, int verbose)
+{
+    int i;
+
+    if (hTclLib)
+	return OK;
+    if (!(hTclLib = load_dll(libname)))
+    {
+	if (verbose)
+	    semsg(_(e_could_not_load_library_str_str), libname, load_dll_error());
+	return FAIL;
+    }
+    for (i = 0; tcl_funcname_table[i].ptr; ++i)
+    {
+	if (!(*tcl_funcname_table[i].ptr = symbol_from_dll(hTclLib,
+						  tcl_funcname_table[i].name)))
+	{
+	    close_dll(hTclLib);
+	    hTclLib = NULL;
+	    if (verbose)
+		semsg(_(e_could_not_load_library_function_str),
+						   tcl_funcname_table[i].name);
+	    return FAIL;
+	}
+    }
+    return OK;
+}
+#endif // defined(DYNAMIC_TCL) || defined(PROTO)
+
+#ifdef DYNAMIC_TCL
+static char *find_executable_arg = NULL;
+#endif
+
+    void
+vim_tcl_init(char *arg)
+{
+#ifndef DYNAMIC_TCL
+    Tcl_FindExecutable(arg);
+#else
+    find_executable_arg = arg;
+#endif
+}
+
+#if defined(DYNAMIC_TCL) || defined(PROTO)
+
+static int stubs_initialized = FALSE;
+
+/*
+ * Return TRUE if the TCL interface can be used.
+ */
+    int
+tcl_enabled(int verbose)
+{
+    if (!stubs_initialized && find_executable_arg != NULL
+	    && tcl_runtime_link_init((char *)p_tcldll, verbose) == OK)
+    {
+	Tcl_Interp *interp;
+
+	// Note: the library will allocate memory to store the executable name,
+	// which will be reported as possibly leaked by valgrind.
+	dll_Tcl_FindExecutable(find_executable_arg);
+
+	if ((interp = dll_Tcl_CreateInterp()) != NULL)
+	{
+	    if (Tcl_InitStubs(interp, DYNAMIC_TCL_VER, 0) != NULL)
+	    {
+		Tcl_DeleteInterp(interp);
+		stubs_initialized = TRUE;
+	    }
+	    // FIXME: When Tcl_InitStubs() was failed, how delete interp?
+	}
+    }
+    return stubs_initialized;
+}
+#endif
+
+#if defined(EXITFREE) || defined(PROTO)
+/*
+ * Called once when exiting.
+ */
+    void
+vim_tcl_finalize(void)
+{
+# ifdef DYNAMIC_TCL
+    if (stubs_initialized)
+# endif
+	Tcl_Finalize();
+}
+#endif
+
+    void
+tcl_end(void)
+{
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Tcl commands
+////////////////////////////////////////////////////////////////////////////
+
+/*
+ * Replace standard "exit" command.
+ *
+ * Delete the Tcl interpreter; a new one will be created with the next
+ * :tcl command). The exit code is saved (and retrieved in tclexit()).
+ * Since Tcl's exit is never expected to return and this replacement
+ * does, then (except for a trivial case) additional Tcl commands will
+ * be run. Since the interpreter is now marked as deleted, an error
+ * will be returned -- typically "attempt to call eval in deleted
+ * interpreter". Hopefully, at this point, checks for TCL_ERROR take
+ * place and control percolates back up to Vim -- but with this new error
+ * string in the interpreter's result value. Therefore it would be
+ * useless for this routine to return the exit code via Tcl_SetResult().
+ */
+    static int
+exitcmd(
+    ClientData dummy UNUSED,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *CONST objv[])
+{
+    int value = 0;
+
+    switch (objc)
+    {
+	case 2:
+	    if (Tcl_GetIntFromObj(interp, objv[1], &value) != TCL_OK)
+		break;
+	    // FALLTHROUGH
+	case 1:
+	    tclinfo.exitvalue = value;
+
+	    Tcl_DeleteInterp(interp);
+	    break;
+	default:
+	    Tcl_WrongNumArgs(interp, 1, objv, "?returnCode?");
+    }
+    return TCL_ERROR;
+}
+
+/*
+ *  "::vim::beep" - what Vi[m] does best :-)
+ */
+    static int
+beepcmd(
+    ClientData dummy UNUSED,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *CONST objv[])
+{
+    if (objc != 1)
+    {
+	Tcl_WrongNumArgs(interp, 1, objv, NULL);
+	return TCL_ERROR;
+    }
+    vim_beep(BO_LANG);
+    return TCL_OK;
+}
+
+/*
+ *  "::vim::buffer list" - create a list of buffer commands.
+ *  "::vim::buffer {N}" - create buffer command for buffer N.
+ *  "::vim::buffer exists {N}" - test if buffer N exists.
+ *  "::vim::buffer new" - create a new buffer (not implemented)
+ */
+    static int
+buffercmd(
+    ClientData dummy UNUSED,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *CONST objv[])
+{
+    char	*name;
+    buf_T	*buf;
+    Tcl_Obj	*resobj;
+    int		err, n, idx;
+    enum {BCMD_EXISTS, BCMD_LIST};
+    static CONST84 char *bcmdoptions[] =
+    {
+	"exists", "list", (char *)0
+    };
+
+    if (objc < 2)
+    {
+	Tcl_WrongNumArgs(interp, 1, objv, "option");
+	return TCL_ERROR;
+    }
+    err = Tcl_GetIntFromObj(interp, objv[1], &n);
+    if (err == TCL_OK)
+    {
+	if (objc != 2)
+	{
+	    Tcl_WrongNumArgs(interp, 1, objv, "bufNumber");
+	    return TCL_ERROR;
+	}
+	FOR_ALL_BUFFERS(buf)
+	{
+	    if (buf->b_fnum == n)
+	    {
+		name = tclgetbuffer(interp, buf);
+		if (name == NULL)
+		    return TCL_ERROR;
+		Tcl_SetResult(interp, name, TCL_VOLATILE);
+		return TCL_OK;
+	    }
+	}
+	Tcl_SetResult(interp, _("invalid buffer number"), TCL_STATIC);
+	return TCL_ERROR;
+    }
+    Tcl_ResetResult(interp); // clear error from Tcl_GetIntFromObj
+
+    err = Tcl_GetIndexFromObj(interp, objv[1], bcmdoptions, "option", 0, &idx);
+    if (err != TCL_OK)
+	return err;
+    switch (idx)
+    {
+	case BCMD_LIST:
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "");
+		err = TCL_ERROR;
+		break;
+	    }
+	    FOR_ALL_BUFFERS(buf)
+	    {
+		name = tclgetbuffer(interp, buf);
+		if (name == NULL)
+		{
+		    err = TCL_ERROR;
+		    break;
+		}
+		Tcl_AppendElement(interp, name);
+	    }
+	    break;
+
+	case BCMD_EXISTS:
+	    if (objc != 3)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "bufNumber");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = Tcl_GetIntFromObj(interp, objv[2], &n);
+	    if (err == TCL_OK)
+	    {
+		buf = buflist_findnr(n);
+		resobj = Tcl_NewIntObj(buf != NULL);
+		Tcl_SetObjResult(interp, resobj);
+	    }
+	    break;
+
+	default:
+	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
+	    err = TCL_ERROR;
+    }
+    return err;
+}
+
+/*
+ * "::vim::window list" - create list of window commands.
+ */
+    static int
+windowcmd(
+    ClientData	dummy UNUSED,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    char	*what, *string;
+    win_T	*win;
+
+    if (objc != 2)
+    {
+	Tcl_WrongNumArgs(interp, 1, objv, "option");
+	return TCL_ERROR;
+    }
+    what = Tcl_GetStringFromObj(objv[1], NULL);
+    if (strcmp(what, "list") == 0)
+    {
+	FOR_ALL_WINDOWS(win)
+	{
+	    string = tclgetwindow(interp, win);
+	    if (string == NULL)
+		return TCL_ERROR;
+	    Tcl_AppendElement(interp, string);
+	}
+	return TCL_OK;
+    }
+    Tcl_SetResult(interp, _("unknown option"), TCL_STATIC);
+    return TCL_ERROR;
+}
+
+/*
+ * flags for bufselfcmd and winselfcmd to indicate outstanding actions.
+ */
+#define FL_UPDATE_SCREEN	(1<<0)
+#define FL_UPDATE_CURBUF	(1<<1)
+#define FL_ADJUST_CURSOR	(1<<2)
+
+/*
+ * This function implements the buffer commands.
+ */
+    static int
+bufselfcmd(
+    ClientData	ref,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    int		opt, err, idx, flags;
+    int		val1, val2, n, i;
+    buf_T	*buf, *savebuf;
+    win_T	*win, *savewin;
+    Tcl_Obj	*resobj;
+    pos_T	*pos;
+    char	*line;
+
+    enum
+    {
+	BUF_APPEND, BUF_COMMAND, BUF_COUNT, BUF_DELCMD, BUF_DELETE, BUF_EXPR,
+	BUF_GET, BUF_INSERT, BUF_LAST, BUF_MARK, BUF_NAME, BUF_NUMBER,
+	BUF_OPTION, BUF_SET, BUF_WINDOWS
+    };
+    static CONST84 char *bufoptions[] =
+    {
+	"append", "command", "count", "delcmd", "delete", "expr",
+	"get", "insert", "last", "mark", "name", "number",
+	"option", "set", "windows", (char *)0
+    };
+
+    if (objc < 2)
+    {
+	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
+	return TCL_ERROR;
+    }
+
+    err = Tcl_GetIndexFromObj(interp, objv[1], bufoptions, "option", 0, &idx);
+    if (err != TCL_OK)
+	return err;
+
+    buf = (buf_T *)((struct ref *)ref)->vimobj;
+    savebuf = curbuf;  curbuf = buf;
+    savewin = curwin;  curwin = tclfindwin(buf);
+    flags = 0;
+    opt = 0;
+
+    switch (idx)
+    {
+	case BUF_COMMAND:
+	    err = tcldoexcommand(interp, objc, objv, 2);
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	case BUF_OPTION:
+	    err = tclsetoption(interp, objc, objv, 2);
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	case BUF_EXPR:
+	    err = tclvimexpr(interp, objc, objv, 2);
+	    break;
+
+	case BUF_NAME:
+	    /*
+	     *	Get filename of buffer.
+	     */
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, NULL);
+		err = TCL_ERROR;
+		break;
+	    }
+	    if (buf->b_ffname)
+		Tcl_SetResult(interp, (char *)buf->b_ffname, TCL_VOLATILE);
+	    else
+		Tcl_SetResult(interp, "", TCL_STATIC);
+	    break;
+
+	case BUF_LAST:
+	    /*
+	     * Get line number of last line.
+	     */
+	    opt = 1;
+	    // fallthrough
+	case BUF_COUNT:
+	    /*
+	     * Get number of lines in buffer.
+	     */
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, NULL);
+		err = TCL_ERROR;
+		break;
+	    }
+	    val1 = (int)buf->b_ml.ml_line_count;
+	    if (opt)
+		val1 = row2tcl(val1);
+
+	    resobj = Tcl_NewIntObj(val1);
+	    Tcl_SetObjResult(interp, resobj);
+	    break;
+
+	case BUF_NUMBER:
+	    /*
+	     * Get buffer's number.
+	     */
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, NULL);
+		err = TCL_ERROR;
+		break;
+	    }
+	    resobj = Tcl_NewIntObj((int)buf->b_fnum);
+	    Tcl_SetObjResult(interp, resobj);
+	    break;
+
+	case BUF_GET:
+	    if (objc != 3 && objc != 4)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "lineNumber ?lineNumber?");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclgetlinenum(interp, objv[2], &val1, buf);
+	    if (err != TCL_OK)
+		break;
+	    if (objc == 4)
+	    {
+		err = tclgetlinenum(interp, objv[3], &val2, buf);
+		if (err != TCL_OK)
+		    break;
+		if (val1 > val2)
+		{
+		    n = val1; val1 = val2; val2 = n;
+		}
+		Tcl_ResetResult(interp);
+
+		for (n = val1; n <= val2 && err == TCL_OK; n++)
+		{
+		    line = (char *)ml_get_buf(buf, (linenr_T)n, FALSE);
+		    if (line)
+			Tcl_AppendElement(interp, line);
+		    else
+			err = TCL_ERROR;
+		}
+	    }
+	    else
+	    {  // objc == 3
+		line = (char *)ml_get_buf(buf, (linenr_T)val1, FALSE);
+		Tcl_SetResult(interp, line, TCL_VOLATILE);
+	    }
+	    break;
+
+	case BUF_SET:
+	    if (objc != 4 && objc != 5)
+	    {
+		Tcl_WrongNumArgs(interp, 3, objv, "lineNumber ?lineNumber? stringOrList");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclgetlinenum(interp, objv[2], &val1, buf);
+	    if (err != TCL_OK)
+		return TCL_ERROR;
+	    if (objc == 4)
+	    {
+		/*
+		 *  Replace one line with a string.
+		 *	$buf set {n} {string}
+		 */
+		line = Tcl_GetStringFromObj(objv[3], NULL);
+		if (u_savesub((linenr_T)val1) != OK)
+		{
+		    Tcl_SetResult(interp, _("cannot save undo information"), TCL_STATIC);
+		    err = TCL_ERROR;
+		}
+		else
+		if (ml_replace((linenr_T)val1, (char_u *)line, TRUE) != OK)
+		{
+		    Tcl_SetResult(interp, _("cannot replace line"), TCL_STATIC);
+		    err = TCL_ERROR;
+		}
+		else
+		{
+		    changed_bytes((linenr_T)val1, 0);
+		    flags |= FL_UPDATE_CURBUF;
+		}
+		break;
+	    }
+	    else
+	    {
+		/*
+		 * Replace several lines with the elements of a Tcl list.
+		 *	$buf set {n} {m} {list}
+		 * If the list contains more than {m}-{n}+1 elements, they
+		 * are * inserted after line {m}.  If the list contains fewer
+		 * elements, * the lines from {n}+length({list}) through {m}
+		 * are deleted.
+		 */
+		int	    lc;
+		Tcl_Obj	    **lv;
+
+		err = tclgetlinenum(interp, objv[3], &val2, buf);
+		if (err != TCL_OK)
+		    break;
+		err = Tcl_ListObjGetElements(interp, objv[4], &lc, &lv);
+		if (err != TCL_OK)
+		    break;
+		if (val1 > val2)
+		{
+		    n = val1;
+		    val1 = val2;
+		    val2 = n;
+		}
+
+		n = val1;
+		if (u_save((linenr_T)(val1 - 1), (linenr_T)(val2 + 1)) != OK)
+		{
+		    Tcl_SetResult(interp, _("cannot save undo information"),
+								  TCL_STATIC);
+		    err = TCL_ERROR;
+		    break;
+		}
+		flags |= FL_UPDATE_CURBUF;
+
+		for (i = 0; i < lc && n <= val2; i++)
+		{
+		    line = Tcl_GetStringFromObj(lv[i], NULL);
+		    if (ml_replace((linenr_T)n, (char_u *)line, TRUE) != OK)
+			goto setListError;
+		    ++n;
+		}
+		if (i < lc)
+		{
+		    // append lines
+		    do
+		    {
+			line = Tcl_GetStringFromObj(lv[i], NULL);
+			if (ml_append((linenr_T)(n - 1),
+					      (char_u *)line, 0, FALSE) != OK)
+			    goto setListError;
+			++n;
+			++i;
+		    } while (i < lc);
+		}
+		else if (n <= val2)
+		{
+		    // did not replace all lines, delete
+		    i = n;
+		    do
+		    {
+			if (ml_delete((linenr_T)i) != OK)
+			    goto setListError;
+			++n;
+		    } while (n <= val2);
+		}
+		lc -= val2 - val1 + 1;	// number of lines to be replaced
+		mark_adjust((linenr_T)val1, (linenr_T)val2, (long)MAXLNUM,
+								    (long)lc);
+		changed_lines((linenr_T)val1, 0, (linenr_T)val2 + 1, (long)lc);
+		break;
+    setListError:
+		u_undo(1);  // ???
+		Tcl_SetResult(interp, _("cannot set line(s)"), TCL_STATIC);
+		err = TCL_ERROR;
+	    }
+	    break;
+
+	case BUF_DELETE:
+	    if (objc != 3  &&  objc != 4)
+	    {
+		Tcl_WrongNumArgs(interp, 3, objv, "lineNumber ?lineNumber?");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclgetlinenum(interp, objv[2], &val1, buf);
+	    if (err != TCL_OK)
+		break;
+	    val2 = val1;
+	    if (objc == 4)
+	    {
+		err = tclgetlinenum(interp, objv[3], &val2, buf);
+		if (err != TCL_OK)
+		    return err;
+		if (val1 > val2)
+		{
+		    i = val1; val1 = val2; val2 = i;
+		}
+	    }
+	    n = val2 - val1 + 1;
+	    if (u_savedel((linenr_T)val1, (long)n) != OK)
+	    {
+		Tcl_SetResult(interp, _("cannot save undo information"),
+								  TCL_STATIC);
+		err = TCL_ERROR;
+		break;
+	    }
+	    for (i = 0; i < n; i++)
+	    {
+		ml_delete((linenr_T)val1);
+		err = vimerror(interp);
+		if (err != TCL_OK)
+		    break;
+	    }
+	    if (i > 0)
+		deleted_lines_mark((linenr_T)val1, (long)i);
+	    flags |= FL_ADJUST_CURSOR|FL_UPDATE_SCREEN;
+	    break;
+
+	case BUF_MARK:
+	    if (objc != 3)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "markName");
+		err = TCL_ERROR;
+		break;
+	    }
+	    line = Tcl_GetStringFromObj(objv[2], NULL);
+
+	    pos = NULL;
+	    if (line[0] != '\0'  &&  line[1] == '\0')
+		pos = getmark(line[0], FALSE);
+	    if (pos == NULL)
+	    {
+		Tcl_SetResult(interp, _("invalid mark name"), TCL_STATIC);
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = vimerror(interp);
+	    if (err != TCL_OK)
+		break;
+	    if (pos->lnum <= 0)
+	    {
+		Tcl_SetResult(interp, _("mark not set"), TCL_STATIC);
+		err = TCL_ERROR;
+	    }
+	    else
+	    {
+		char rbuf[64];
+
+		sprintf(rbuf, _("row %d column %d"),
+			     (int)row2tcl(pos->lnum), (int)col2tcl(pos->col));
+		Tcl_SetResult(interp, rbuf, TCL_VOLATILE);
+	    }
+	    break;
+
+	case BUF_INSERT:
+	    opt = 1;
+	    // fallthrough
+	case BUF_APPEND:
+	    if (objc != 4)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "lineNum text");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclgetlinenum(interp, objv[2], &val1, buf);
+	    if (err != TCL_OK)
+		break;
+	    if (opt)
+		--val1;
+	    if (u_save((linenr_T)val1, (linenr_T)(val1+1)) != OK)
+	    {
+		Tcl_SetResult(interp, _("cannot save undo information"),
+								  TCL_STATIC);
+		err = TCL_ERROR;
+		break;
+	    }
+
+	    line = Tcl_GetStringFromObj(objv[3], NULL);
+	    if (ml_append((linenr_T)val1, (char_u *)line, 0, FALSE) != OK)
+	    {
+		Tcl_SetResult(interp, _("cannot insert/append line"),
+								  TCL_STATIC);
+		err = TCL_ERROR;
+		break;
+	    }
+	    appended_lines_mark((linenr_T)val1, 1L);
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	case BUF_WINDOWS:
+	    /*
+	     * Return list of window commands.
+	     */
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, NULL);
+		err = TCL_ERROR;
+		break;
+	    }
+	    Tcl_ResetResult(interp);
+	    FOR_ALL_WINDOWS(win)
+	    {
+		if (win->w_buffer == buf)
+		{
+		    line = tclgetwindow(interp, win);
+		    if (line != NULL)
+			Tcl_AppendElement(interp, line);
+		    else
+		    {
+			err = TCL_ERROR;
+			break;
+		    }
+		}
+	    }
+	    break;
+
+	case BUF_DELCMD:
+	    /*
+	     * Register deletion callback.
+	     * TODO: Should be able to register multiple callbacks
+	     */
+	    if (objc != 3)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "command");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclsetdelcmd(interp, buf->b_tcl_ref, (void *)buf, objv[2]);
+	    break;
+
+	default:
+	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
+	    err = TCL_ERROR;
+    }
+
+    if (flags & FL_UPDATE_CURBUF)
+	redraw_curbuf_later(UPD_NOT_VALID);
+    curbuf = savebuf;
+    curwin = savewin;
+    if (flags & FL_ADJUST_CURSOR)
+	check_cursor();
+    if (flags & (FL_UPDATE_SCREEN | FL_UPDATE_CURBUF))
+	update_screen(UPD_NOT_VALID);
+
+    return err;
+}
+
+/*
+ * This function implements the window commands.
+ */
+    static int
+winselfcmd(
+    ClientData	ref,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    int		err, idx, flags;
+    int		val1, val2;
+    Tcl_Obj	*resobj;
+    win_T	*savewin, *win;
+    buf_T	*savebuf;
+    char	*str;
+
+    enum
+    {
+	WIN_BUFFER, WIN_COMMAND, WIN_CURSOR, WIN_DELCMD, WIN_EXPR,
+	WIN_HEIGHT, WIN_OPTION
+    };
+    static CONST84 char *winoptions[] =
+    {
+	"buffer", "command", "cursor", "delcmd", "expr",
+	"height", "option", (char *)0
+    };
+
+    if (objc < 2)
+    {
+	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
+	return TCL_ERROR;
+    }
+
+    err = Tcl_GetIndexFromObj(interp, objv[1], winoptions, "option", 0,  &idx);
+    if (err != TCL_OK)
+	return TCL_ERROR;
+
+    win = (win_T *)((struct ref *)ref)->vimobj;
+    savewin = curwin;  curwin = win;
+    savebuf = curbuf;  curbuf = win->w_buffer;
+    flags = 0;
+
+    switch (idx)
+    {
+	case WIN_OPTION:
+	    err = tclsetoption(interp, objc, objv, 2);
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	case WIN_COMMAND:
+	    err = tcldoexcommand(interp, objc, objv, 2);
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	case WIN_EXPR:
+	    err = tclvimexpr(interp, objc, objv, 2);
+	    break;
+
+	case WIN_HEIGHT:
+	    if (objc == 3)
+	    {
+		err = Tcl_GetIntFromObj(interp, objv[2], &val1);
+		if (err != TCL_OK)
+		    break;
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setheight(val1);
+		err = vimerror(interp);
+		if (err != TCL_OK)
+		    break;
+	    }
+	    else
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "?value?");
+		err = TCL_ERROR;
+		break;
+	    }
+
+	    resobj = Tcl_NewIntObj((int)(win->w_height));
+	    Tcl_SetObjResult(interp, resobj);
+	    break;
+
+	case WIN_BUFFER:
+	    if (objc != 2)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, NULL);
+		err = TCL_ERROR;
+		break;
+	    }
+	    str = tclgetbuffer(interp, win->w_buffer);
+	    if (str)
+		Tcl_SetResult(interp, str, TCL_VOLATILE);
+	    else
+		err = TCL_ERROR;
+	    break;
+
+	case WIN_DELCMD:
+	    if (objc != 3)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "command");
+		err = TCL_ERROR;
+		break;
+	    }
+	    err = tclsetdelcmd(interp, win->w_tcl_ref, (void *)win, objv[2]);
+	    break;
+
+	case WIN_CURSOR:
+	    if (objc > 4)
+	    {
+		Tcl_WrongNumArgs(interp, 2, objv, "?arg1 ?arg2??");
+		err = TCL_ERROR;
+		break;
+	    }
+	    if (objc == 2)
+	    {
+		char buf[64];
+
+		sprintf(buf, _("row %d column %d"), (int)row2tcl(win->w_cursor.lnum), (int)col2tcl(win->w_cursor.col));
+		Tcl_SetResult(interp, buf, TCL_VOLATILE);
+		break;
+	    }
+	    else if (objc == 3)
+	    {
+		Tcl_Obj *part, *var;
+
+		part = Tcl_NewStringObj("row", -1);
+		var = Tcl_ObjGetVar2(interp, objv[2], part, TCL_LEAVE_ERR_MSG);
+		if (var == NULL)
+		{
+		    err = TCL_ERROR;
+		    break;
+		}
+		err = tclgetlinenum(interp, var, &val1, win->w_buffer);
+		if (err != TCL_OK)
+		    break;
+		part = Tcl_NewStringObj("column", -1);
+		var = Tcl_ObjGetVar2(interp, objv[2], part, TCL_LEAVE_ERR_MSG);
+		if (var == NULL)
+		{
+		    err = TCL_ERROR;
+		    break;
+		}
+		err = Tcl_GetIntFromObj(interp, var, &val2);
+		if (err != TCL_OK)
+		    break;
+	    }
+	    else
+	    {  // objc == 4
+		err = tclgetlinenum(interp, objv[2], &val1, win->w_buffer);
+		if (err != TCL_OK)
+		    break;
+		err = Tcl_GetIntFromObj(interp, objv[3], &val2);
+		if (err != TCL_OK)
+		    break;
+	    }
+	    // TODO: should check column
+	    win->w_cursor.lnum = val1;
+	    win->w_cursor.col = col2vim(val2);
+	    win->w_set_curswant = TRUE;
+	    flags |= FL_UPDATE_SCREEN;
+	    break;
+
+	default:
+	    Tcl_SetResult(interp, _("not implemented yet"), TCL_STATIC);
+	    break;
+    }
+
+    curwin = savewin;
+    curbuf = savebuf;
+    if (flags & FL_UPDATE_SCREEN)
+	update_screen(UPD_NOT_VALID);
+
+    return err;
+}
+
+
+    static int
+commandcmd(
+    ClientData	dummy UNUSED,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    int		err;
+
+    err = tcldoexcommand(interp, objc, objv, 1);
+    update_screen(UPD_VALID);
+    return err;
+}
+
+    static int
+optioncmd(
+    ClientData	dummy UNUSED,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    int		err;
+
+    err = tclsetoption(interp, objc, objv, 1);
+    update_screen(UPD_VALID);
+    return err;
+}
+
+    static int
+exprcmd(
+    ClientData	dummy UNUSED,
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[])
+{
+    return tclvimexpr(interp, objc, objv, 1);
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Support functions for Tcl commands
+////////////////////////////////////////////////////////////////////////////
+
+/*
+ * Get a line number from 'obj' and convert it to vim's range.
+ */
+    static int
+tclgetlinenum(
+    Tcl_Interp	*interp,
+    Tcl_Obj	*obj,
+    int		*valueP,
+    buf_T	*buf)
+{
+    int err, i;
+
+    enum { LN_BEGIN, LN_BOTTOM, LN_END, LN_FIRST, LN_LAST, LN_START, LN_TOP };
+
+    static CONST84 char *keyw[] =
+    {
+	"begin", "bottom", "end", "first", "last", "start", "top", (char *)0
+    };
+
+    err = Tcl_GetIndexFromObj(interp, obj, keyw, "", 0, &i);
+    if (err == TCL_OK)
+    {
+	switch (i)
+	{
+	    case LN_BEGIN:
+	    case LN_FIRST:
+	    case LN_START:
+	    case LN_TOP:
+		*valueP = 1;
+		break;
+	    case LN_BOTTOM:
+	    case LN_END:
+	    case LN_LAST:
+		*valueP = buf->b_ml.ml_line_count;
+		break;
+	}
+	return TCL_OK;
+    }
+    Tcl_ResetResult(interp);
+
+    err = Tcl_GetIntFromObj(interp, obj, &i);
+    if (err != TCL_OK)
+	return err;
+    i = row2vim(i);
+    if (i < 1  ||  i > buf->b_ml.ml_line_count)
+    {
+	Tcl_SetResult(interp, _("line number out of range"), TCL_STATIC);
+	return TCL_ERROR;
+    }
+    *valueP = i;
+    return TCL_OK;
+}
+
+/*
+ * Find the first window in the window list that displays the buffer.
+ */
+    static win_T *
+tclfindwin(buf_T *buf)
+{
+    win_T *win;
+
+    FOR_ALL_WINDOWS(win)
+    {
+	if (win->w_buffer == buf)
+	    return win;
+    }
+    return curwin;  // keep current window context
+}
+
+/*
+ * Do-it-all function for "::vim::command", "$buf command" and "$win command".
+ */
+    static int
+tcldoexcommand(
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[],
+    int		objn)
+{
+    tcl_info	saveinfo;
+    int		err, flag, nobjs;
+    char	*arg;
+
+    nobjs = objc - objn;
+    if (nobjs < 1 || nobjs > 2)
+    {
+	Tcl_WrongNumArgs(interp, objn, objv, "?-quiet? exCommand");
+	return TCL_ERROR;
+    }
+
+    flag = 0;
+    if (nobjs == 2)
+    {
+	arg = Tcl_GetStringFromObj(objv[objn], NULL);
+	if (strcmp(arg, "-quiet") == 0)
+	    flag = 1;
+	else
+	{
+	    Tcl_ResetResult(interp);
+	    Tcl_AppendResult(interp, _("unknown flag: "), arg, (char *)0);
+	    return TCL_ERROR;
+	}
+	++objn;
+    }
+
+    memcpy(&saveinfo, &tclinfo, sizeof(tcl_info));
+    tclinfo.interp = NULL;
+    tclinfo.curwin = NULL;
+    tclinfo.curbuf = NULL;
+
+    arg = Tcl_GetStringFromObj(objv[objn], NULL);
+    if (flag)
+	++emsg_off;
+    do_cmdline_cmd((char_u *)arg);
+    if (flag)
+	--emsg_off;
+    err = vimerror(interp);
+
+    // If the ex command created a new Tcl interpreter, remove it
+    if (tclinfo.interp)
+	tcldelthisinterp();
+    memcpy(&tclinfo, &saveinfo, sizeof(tcl_info));
+    tclupdatevars();
+
+    return err;
+}
+
+/*
+ * Do-it-all function for "::vim::option", "$buf option" and "$win option".
+ */
+    static int
+tclsetoption(
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[],
+    int		objn)
+{
+    int		err, nobjs, idx;
+    char_u	*option;
+    getoption_T	gov;
+    long	lval;
+    char_u	*sval;
+    Tcl_Obj	*resobj;
+
+    enum { OPT_OFF, OPT_ON, OPT_TOGGLE };
+    static CONST84 char *optkw[] = { "off", "on", "toggle", (char *)0 };
+
+    nobjs = objc - objn;
+    if (nobjs != 1 && nobjs != 2)
+    {
+	Tcl_WrongNumArgs(interp, objn, objv, "vimOption ?value?");
+	return TCL_ERROR;
+    }
+
+    option = (char_u *)Tcl_GetStringFromObj(objv[objn], NULL);
+    ++objn;
+    gov = get_option_value(option, &lval, &sval, NULL, 0);
+    err = TCL_OK;
+    switch (gov)
+    {
+	case gov_string:
+	    Tcl_SetResult(interp, (char *)sval, TCL_VOLATILE);
+	    vim_free(sval);
+	    break;
+	case gov_bool:
+	case gov_number:
+	    resobj = Tcl_NewLongObj(lval);
+	    Tcl_SetObjResult(interp, resobj);
+	    break;
+	default:
+	    Tcl_SetResult(interp, _("unknown vimOption"), TCL_STATIC);
+	    return TCL_ERROR;
+    }
+    if (nobjs == 2)
+    {
+	if (gov != gov_string)
+	{
+	    sval = NULL;    // avoid compiler warning
+	    err = Tcl_GetIndexFromObj(interp, objv[objn], optkw, "", 0, &idx);
+	    if (err != TCL_OK)
+	    {
+		Tcl_ResetResult(interp);
+		err = Tcl_GetLongFromObj(interp, objv[objn], &lval);
+	    }
+	    else
+	    {
+		switch (idx)
+		{
+		    case OPT_ON:
+			lval = 1;
+			break;
+		    case OPT_OFF:
+			lval = 0;
+			break;
+		    case OPT_TOGGLE:
+			lval = !lval;
+			break;
+		}
+	    }
+	}
+	else
+	    sval = (char_u *)Tcl_GetStringFromObj(objv[objn], NULL);
+	if (err == TCL_OK)
+	{
+	    set_option_value_give_err(option, lval, sval, OPT_LOCAL);
+	    err = vimerror(interp);
+	}
+    }
+    return err;
+}
+
+/*
+ * Do-it-all function for "::vim::expr", "$buf expr" and "$win expr".
+ */
+    static int
+tclvimexpr(
+    Tcl_Interp	*interp,
+    int		objc,
+    Tcl_Obj	*CONST objv[],
+    int		objn)
+{
+#ifdef FEAT_EVAL
+    char	*expr, *str;
+#endif
+    int		err;
+
+    if (objc - objn != 1)
+    {
+	Tcl_WrongNumArgs(interp, objn, objv, "vimExpr");
+	return TCL_ERROR;
+    }
+
+#ifdef FEAT_EVAL
+    expr = Tcl_GetStringFromObj(objv[objn], NULL);
+    str = (char *)eval_to_string((char_u *)expr, TRUE, FALSE);
+    if (str == NULL)
+	Tcl_SetResult(interp, _("invalid expression"), TCL_STATIC);
+    else
+    {
+	Tcl_SetResult(interp, str, TCL_VOLATILE);
+	vim_free(str);
+    }
+    err = vimerror(interp);
+#else
+    Tcl_SetResult(interp, _("expressions disabled at compile time"), TCL_STATIC);
+    err = TCL_ERROR;
+#endif
+
+    return err;
+}
+
+/*
+ * Check for internal vim errors.
+ */
+    static int
+vimerror(Tcl_Interp *interp)
+{
+    if (got_int)
+    {
+	Tcl_SetResult(interp, _("keyboard interrupt"), TCL_STATIC);
+	return TCL_ERROR;
+    }
+    else if (did_emsg)
+    {
+	Tcl_SetResult(interp, _("Vim error"), TCL_STATIC);
+	return TCL_ERROR;
+    }
+    return TCL_OK;
+}
+
+/*
+ * Functions that handle the reference lists:
+ *   delref() - callback for Tcl's DeleteCommand
+ *   tclgetref() - find/create Tcl command for a win_T* or buf_T* object
+ *   tclgetwindow() - window frontend for tclgetref()
+ *   tclgetbuffer() - buffer frontend for tclgetref()
+ *   tclsetdelcmd() - add Tcl callback command to a vim object
+ */
+    static void
+delref(ClientData cref)
+{
+    struct ref *ref = (struct ref *)cref;
+
+    if (ref->delcmd)
+    {
+	Tcl_DecrRefCount(ref->delcmd);
+	ref->delcmd = NULL;
+    }
+    ref->interp = NULL;
+}
+
+    static char *
+tclgetref(
+    Tcl_Interp	*interp,
+    void	**refstartP,	// ptr to w_tcl_ref/b_tcl-ref member of
+				// win_T/buf_T struct
+    char	*prefix,	// "win" or "buf"
+    void	*vimobj,	// win_T* or buf_T*
+    Tcl_ObjCmdProc *proc)	// winselfcmd or bufselfcmd
+{
+    struct ref *ref, *unused = NULL;
+    static char name[VARNAME_SIZE];
+    Tcl_Command cmd;
+
+    ref = (struct ref *)(*refstartP);
+    if (ref == &refsdeleted)
+    {
+	Tcl_SetResult(interp, _("cannot create buffer/window command: object is being deleted"), TCL_STATIC);
+	return NULL;
+    }
+
+    while (ref != NULL)
+    {
+	if (ref->interp == interp)
+	    break;
+	if (ref->interp == NULL)
+	    unused = ref;
+	ref = ref->next;
+    }
+
+    if (ref)
+	vim_snprintf(name, sizeof(name), "::vim::%s",
+					Tcl_GetCommandName(interp, ref->cmd));
+    else
+    {
+	if (unused)
+	    ref = unused;
+	else
+	{
+	    ref = (struct ref *)Tcl_Alloc(sizeof(struct ref));
+	    ref->interp = NULL;
+	    ref->next = (struct ref *)(*refstartP);
+	    (*refstartP) = (void *)ref;
+	}
+
+	// This might break on some exotic systems...
+	vim_snprintf(name, sizeof(name), "::vim::%s_%lx",
+					       prefix, (unsigned long)vimobj);
+	cmd = Tcl_CreateObjCommand(interp, name, proc,
+	    (ClientData)ref, (Tcl_CmdDeleteProc *)delref);
+	if (!cmd)
+	    return NULL;
+
+	ref->interp = interp;
+	ref->cmd = cmd;
+	ref->delcmd = NULL;
+	ref->vimobj = vimobj;
+    }
+    return name;
+}
+
+    static char *
+tclgetwindow(Tcl_Interp *interp, win_T *win)
+{
+    return tclgetref(interp, &(win->w_tcl_ref), "win", (void *)win, winselfcmd);
+}
+
+    static char *
+tclgetbuffer(Tcl_Interp *interp, buf_T *buf)
+{
+    return tclgetref(interp, &(buf->b_tcl_ref), "buf", (void *)buf, bufselfcmd);
+}
+
+    static int
+tclsetdelcmd(
+    Tcl_Interp	*interp,
+    struct ref	*reflist,
+    void	*vimobj,
+    Tcl_Obj	*delcmd)
+{
+    if (reflist == &refsdeleted)
+    {
+	Tcl_SetResult(interp, _("cannot register callback command: buffer/window is already being deleted"), TCL_STATIC);
+	return TCL_ERROR;
+    }
+
+    while (reflist != NULL)
+    {
+	if (reflist->interp == interp && reflist->vimobj == vimobj)
+	{
+	    if (reflist->delcmd)
+		Tcl_DecrRefCount(reflist->delcmd);
+	    Tcl_IncrRefCount(delcmd);
+	    reflist->delcmd = delcmd;
+	    return TCL_OK;
+	}
+	reflist = reflist->next;
+    }
+    // This should never happen.  Famous last word?
+    iemsg(e_tcl_fatal_error_reflist_corrupt_please_report_this);
+    Tcl_SetResult(interp, _("cannot register callback command: buffer/window reference not found"), TCL_STATIC);
+    return TCL_ERROR;
+}
+
+
+////////////////////////////////////////////
+//    I/O Channel
+////////////////////////////////////////////
+
+    static int
+tcl_channel_close(ClientData instance, Tcl_Interp *interp UNUSED)
+{
+    int		err = 0;
+
+    // currently does nothing
+
+    if (instance != VIMOUT && instance != VIMERR)
+    {
+	Tcl_SetErrno(EBADF);
+	err = EBADF;
+    }
+    return err;
+}
+
+    static int
+tcl_channel_input(
+    ClientData	instance UNUSED,
+    char	*buf UNUSED,
+    int		bufsiz UNUSED,
+    int		*errptr)
+{
+
+    // input is currently not supported
+
+    Tcl_SetErrno(EINVAL);
+    if (errptr)
+	*errptr = EINVAL;
+    return -1;
+}
+
+    static int
+tcl_channel_output(
+    ClientData	instance,
+    const char	*buf,
+    int		bufsiz,
+    int		*errptr)
+{
+    char_u	*str;
+    int		result;
+
+    // The buffer is not guaranteed to be 0-terminated, and we don't if
+    // there is enough room to add a '\0'.  So we have to create a copy
+    // of the buffer...
+    str = vim_strnsave((char_u *)buf, bufsiz);
+    if (!str)
+    {
+	Tcl_SetErrno(ENOMEM);
+	if (errptr)
+	    *errptr = ENOMEM;
+	return -1;
+    }
+
+    result = bufsiz;
+    if (instance == VIMOUT)
+	tclmsg((char *)str);
+    else
+    if (instance == VIMERR)
+	tclerrmsg((char *)str);
+    else
+    {
+	Tcl_SetErrno(EBADF);
+	if (errptr)
+	    *errptr = EBADF;
+	result = -1;
+    }
+    vim_free(str);
+    return result;
+}
+
+    static void
+tcl_channel_watch(ClientData instance UNUSED, int mask UNUSED)
+{
+    Tcl_SetErrno(EINVAL);
+}
+
+    static int
+tcl_channel_gethandle(
+    ClientData	instance UNUSED,
+    int		direction UNUSED,
+    ClientData	*handleptr UNUSED)
+{
+    Tcl_SetErrno(EINVAL);
+    return EINVAL;
+}
+
+
+static Tcl_ChannelType tcl_channel_type =
+{
+    "vimmessage",	// typeName
+    TCL_CHANNEL_VERSION_2, // version
+    tcl_channel_close,	// closeProc
+    tcl_channel_input,	// inputProc
+    tcl_channel_output,	// outputProc
+    NULL,		// seekProc
+    NULL,		// setOptionProc
+    NULL,		// getOptionProc
+    tcl_channel_watch,	// watchProc
+    tcl_channel_gethandle, // getHandleProc
+    NULL,		// close2Proc
+    NULL,		// blockModeProc
+#ifdef TCL_CHANNEL_VERSION_2
+    NULL,		// flushProc
+    NULL,		// handlerProc
+#endif
+// The following should not be necessary since TCL_CHANNEL_VERSION_2 was
+// set above
+#ifdef TCL_CHANNEL_VERSION_3
+    NULL,		// wideSeekProc
+#endif
+#ifdef TCL_CHANNEL_VERSION_4
+    NULL,		// threadActionProc
+#endif
+#ifdef TCL_CHANNEL_VERSION_5
+    NULL		// truncateProc
+#endif
+};
+
+///////////////////////////////////
+// Interface to vim
+//////////////////////////////////
+
+    static void
+tclupdatevars(void)
+{
+    char varname[VARNAME_SIZE];	// must be writeable
+    char *name;
+
+    strcpy(varname, VAR_RANGE1);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+    strcpy(varname, VAR_RANGE2);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+    strcpy(varname, VAR_RANGE3);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+
+    strcpy(varname, VAR_LBASE);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+
+    name = tclgetbuffer(tclinfo.interp, curbuf);
+    strcpy(tclinfo.curbuf, name);
+    strcpy(varname, VAR_CURBUF);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+
+    name = tclgetwindow(tclinfo.interp, curwin);
+    strcpy(tclinfo.curwin, name);
+    strcpy(varname, VAR_CURWIN);
+    Tcl_UpdateLinkedVar(tclinfo.interp, varname);
+}
+
+
+    static int
+tclinit(exarg_T *eap)
+{
+    char varname[VARNAME_SIZE];	// Tcl_LinkVar requires writeable varname
+    char *name;
+
+#ifdef DYNAMIC_TCL
+    if (!tcl_enabled(TRUE))
+    {
+	emsg(_(e_sorry_this_command_is_disabled_tcl_library_could_not_be_loaded));
+	return FAIL;
+    }
+#endif
+
+    if (!tclinfo.interp)
+    {
+	Tcl_Interp *interp;
+	static Tcl_Channel ch1, ch2;
+
+	// Create replacement channels for stdout and stderr; this has to be
+	// done each time an interpreter is created since the channels are closed
+	// when the interpreter is deleted
+	ch1 = Tcl_CreateChannel(&tcl_channel_type, "vimout", VIMOUT, TCL_WRITABLE);
+	ch2 = Tcl_CreateChannel(&tcl_channel_type, "vimerr", VIMERR, TCL_WRITABLE);
+	Tcl_SetStdChannel(ch1, TCL_STDOUT);
+	Tcl_SetStdChannel(ch2, TCL_STDERR);
+
+	interp = Tcl_CreateInterp();
+	Tcl_Preserve(interp);
+	if (Tcl_Init(interp) == TCL_ERROR)
+	{
+	    Tcl_Release(interp);
+	    Tcl_DeleteInterp(interp);
+	    return FAIL;
+	}
+#if 0
+	// VIM sure is interactive
+	Tcl_SetVar(interp, "tcl_interactive", "1", TCL_GLOBAL_ONLY);
+#endif
+
+	Tcl_SetChannelOption(interp, ch1, "-buffering", "line");
+#ifdef MSWIN
+	Tcl_SetChannelOption(interp, ch1, "-translation", "lf");
+#endif
+	Tcl_SetChannelOption(interp, ch2, "-buffering", "line");
+#ifdef MSWIN
+	Tcl_SetChannelOption(interp, ch2, "-translation", "lf");
+#endif
+
+	// replace standard Tcl exit command
+	Tcl_DeleteCommand(interp, "exit");
+	Tcl_CreateObjCommand(interp, "exit", exitcmd,
+	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+
+	// new commands, in ::vim namespace
+	Tcl_CreateObjCommand(interp, "::vim::buffer", buffercmd,
+	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	Tcl_CreateObjCommand(interp, "::vim::window", windowcmd,
+	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	Tcl_CreateObjCommand(interp, "::vim::command", commandcmd,
+	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	Tcl_CreateObjCommand(interp, "::vim::beep", beepcmd,
+	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	Tcl_CreateObjCommand(interp, "::vim::option", optioncmd,
+	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	Tcl_CreateObjCommand(interp, "::vim::expr", exprcmd,
+	   (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+
+	// "lbase" variable
+	tclinfo.lbase = 1;
+	strcpy(varname, VAR_LBASE);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.lbase, TCL_LINK_INT);
+
+	// "range" variable
+	tclinfo.range_start = eap->line1;
+	strcpy(varname, VAR_RANGE1);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_start, TCL_LINK_INT|TCL_LINK_READ_ONLY);
+	strcpy(varname, VAR_RANGE2);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_start, TCL_LINK_INT|TCL_LINK_READ_ONLY);
+	tclinfo.range_end   = eap->line2;
+	strcpy(varname, VAR_RANGE3);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.range_end, TCL_LINK_INT|TCL_LINK_READ_ONLY);
+
+	// "current" variable
+	tclinfo.curbuf = Tcl_Alloc(VARNAME_SIZE);
+	tclinfo.curwin = Tcl_Alloc(VARNAME_SIZE);
+	name = tclgetbuffer(interp, curbuf);
+	strcpy(tclinfo.curbuf, name);
+	strcpy(varname, VAR_CURBUF);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.curbuf, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
+	name = tclgetwindow(interp, curwin);
+	strcpy(tclinfo.curwin, name);
+	strcpy(varname, VAR_CURWIN);
+	Tcl_LinkVar(interp, varname, (char *)&tclinfo.curwin, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
+
+	tclinfo.interp = interp;
+    }
+    else
+    {
+	// Interpreter already exists, just update variables
+	tclinfo.range_start = row2tcl(eap->line1);
+	tclinfo.range_end = row2tcl(eap->line2);
+	tclupdatevars();
+    }
+
+    tclinfo.exitvalue = 0;
+    return OK;
+}
+
+    static void
+tclerrmsg(char *text)
+{
+    char *next;
+
+    while ((next=strchr(text, '\n')))
+    {
+	*next++ = '\0';
+	emsg(text);
+	text = next;
+    }
+    if (*text)
+	emsg(text);
+}
+
+    static void
+tclmsg(char *text)
+{
+    char *next;
+
+    while ((next=strchr(text, '\n')))
+    {
+	*next++ = '\0';
+	msg(text);
+	text = next;
+    }
+    if (*text)
+	msg(text);
+}
+
+    static void
+tcldelthisinterp(void)
+{
+    if (!Tcl_InterpDeleted(tclinfo.interp))
+	Tcl_DeleteInterp(tclinfo.interp);
+    Tcl_Release(tclinfo.interp);
+    // The interpreter is now gets deleted.  All registered commands (esp.
+    // window and buffer commands) are deleted, triggering their deletion
+    // callback, which deletes all refs pointing to this interpreter.
+    // We could garbage-collect the unused ref structs in all windows and
+    // buffers, but unless the user creates hundreds of sub-interpreters
+    // all referring to lots of windows and buffers, this is hardly worth
+    // the effort.  Unused refs are recycled by other interpreters, and
+    // all refs are free'd when the window/buffer gets closed by vim.
+
+    tclinfo.interp = NULL;
+    Tcl_Free(tclinfo.curbuf);
+    Tcl_Free(tclinfo.curwin);
+    tclinfo.curbuf = tclinfo.curwin = NULL;
+}
+
+    static int
+tclexit(int error)
+{
+    int newerr = OK;
+
+    if (Tcl_InterpDeleted(tclinfo.interp)     // True if we intercepted Tcl's exit command
+#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
+	|| Tcl_LimitExceeded(tclinfo.interp)  // True if the interpreter cannot continue
+#endif
+	)
+    {
+	char buf[50];
+
+	sprintf(buf, _(e_exit_code_nr), tclinfo.exitvalue);
+	tclerrmsg(buf);
+	if (tclinfo.exitvalue == 0)
+	{
+	    did_emsg = 0;
+	    newerr = OK;
+	}
+	else
+	    newerr = FAIL;
+
+	tcldelthisinterp();
+    }
+    else
+    {
+	char *result;
+
+	result = (char *)Tcl_GetStringResult(tclinfo.interp);
+	if (error == TCL_OK)
+	{
+	    tclmsg(result);
+	    newerr = OK;
+	}
+	else
+	{
+	    tclerrmsg(result);
+	    newerr = FAIL;
+	}
+    }
+
+    return newerr;
+}
+
+/*
+ * ":tcl"
+ */
+    void
+ex_tcl(exarg_T *eap)
+{
+    char_u	*script;
+    int		err;
+
+    script = script_get(eap, eap->arg);
+    if (!eap->skip)
+    {
+	err = tclinit(eap);
+	if (err == OK)
+	{
+	    Tcl_AllowExceptions(tclinfo.interp);
+	    if (script == NULL)
+		err = Tcl_Eval(tclinfo.interp, (char *)eap->arg);
+	    else
+		err = Tcl_Eval(tclinfo.interp, (char *)script);
+	    err = tclexit(err);
+	}
+    }
+    vim_free(script);
+}
+
+/*
+ * ":tclfile"
+ */
+    void
+ex_tclfile(exarg_T *eap)
+{
+    char *file = (char *)eap->arg;
+    int err;
+
+    err = tclinit(eap);
+    if (err == OK)
+    {
+	Tcl_AllowExceptions(tclinfo.interp);
+	err = Tcl_EvalFile(tclinfo.interp, file);
+	err = tclexit(err);
+    }
+}
+
+/*
+ * ":tcldo"
+ */
+    void
+ex_tcldo(exarg_T *eap)
+{
+    char	*script, *line;
+    int		err, rs, re, lnum;
+    char	var_lnum[VARNAME_SIZE]; // must be writeable memory
+    char	var_line[VARNAME_SIZE];
+    linenr_T	first_line = 0;
+    linenr_T	last_line = 0;
+    buf_T	*was_curbuf = curbuf;
+
+    rs = eap->line1;
+    re = eap->line2;
+    script = (char *)eap->arg;
+    strcpy(var_lnum, VAR_CURLNUM);
+    strcpy(var_line, VAR_CURLINE);
+
+    err = tclinit(eap);
+    if (err != OK)
+	return;
+
+    lnum = row2tcl(rs);
+    Tcl_LinkVar(tclinfo.interp, var_lnum, (char *)&lnum, TCL_LINK_INT|TCL_LINK_READ_ONLY);
+    err = TCL_OK;
+    if (u_save((linenr_T)(rs-1), (linenr_T)(re+1)) != OK)
+    {
+	Tcl_SetResult(tclinfo.interp, _("cannot save undo information"), TCL_STATIC);
+	err = TCL_ERROR;
+    }
+    while (err == TCL_OK  &&  rs <= re)
+    {
+	if ((linenr_T)rs > curbuf->b_ml.ml_line_count)
+	    break;
+	line = (char *)ml_get_buf(curbuf, (linenr_T)rs, FALSE);
+	if (!line)
+	{
+	    Tcl_SetResult(tclinfo.interp, _("cannot get line"), TCL_STATIC);
+	    err = TCL_ERROR;
+	    break;
+	}
+	Tcl_SetVar(tclinfo.interp, var_line, line, 0);
+	Tcl_AllowExceptions(tclinfo.interp);
+	err = Tcl_Eval(tclinfo.interp, script);
+	if (err != TCL_OK
+	    || Tcl_InterpDeleted(tclinfo.interp)
+#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
+	    || Tcl_LimitExceeded(tclinfo.interp)
+#endif
+	    || curbuf != was_curbuf)
+	    break;
+	line = (char *)Tcl_GetVar(tclinfo.interp, var_line, 0);
+	if (line)
+	{
+	    if (ml_replace((linenr_T)rs, (char_u *)line, TRUE) != OK)
+	    {
+		Tcl_SetResult(tclinfo.interp, _("cannot replace line"), TCL_STATIC);
+		err = TCL_ERROR;
+		break;
+	    }
+	    if (first_line == 0)
+		first_line = rs;
+	    last_line = rs;
+	}
+	++rs;
+	++lnum;
+	Tcl_UpdateLinkedVar(tclinfo.interp, var_lnum);
+    }
+    if (first_line)
+	changed_lines(first_line, 0, last_line + 1, (long)0);
+
+    Tcl_UnsetVar(tclinfo.interp, var_line, 0);
+    Tcl_UnlinkVar(tclinfo.interp, var_lnum);
+    if (err == TCL_OK)
+	Tcl_ResetResult(tclinfo.interp);
+
+    (void)tclexit(err);
+}
+
+    static void
+tcldelallrefs(struct ref *ref)
+{
+    struct ref	*next;
+    int		err;
+    char	*result;
+
+#ifdef DYNAMIC_TCL
+    // TODO: this code currently crashes Vim on exit
+    if (exiting)
+	return;
+#endif
+
+    while (ref != NULL)
+    {
+	next = ref->next;
+	if (ref->interp)
+	{
+	    if (ref->delcmd)
+	    {
+		err = Tcl_GlobalEvalObj(ref->interp, ref->delcmd);
+		if (err != TCL_OK)
+		{
+		    result = (char *)Tcl_GetStringResult(ref->interp);
+		    if (result)
+			tclerrmsg(result);
+		}
+		Tcl_DecrRefCount(ref->delcmd);
+		ref->delcmd = NULL;
+	    }
+	    Tcl_DeleteCommandFromToken(ref->interp, ref->cmd);
+	}
+	Tcl_Free((char *)ref);
+	ref = next;
+    }
+}
+
+    void
+tcl_buffer_free(buf_T *buf)
+{
+    struct ref *reflist;
+
+#ifdef DYNAMIC_TCL
+    if (!stubs_initialized)	// Not using Tcl, nothing to do.
+	return;
+#endif
+
+    reflist = (struct ref *)(buf->b_tcl_ref);
+    if (reflist != &refsdeleted)
+    {
+	buf->b_tcl_ref = (void *)&refsdeleted;
+	tcldelallrefs(reflist);
+	buf->b_tcl_ref = NULL;
+    }
+}
+
+    void
+tcl_window_free(win_T *win)
+{
+    struct ref *reflist;
+
+#ifdef DYNAMIC_TCL
+    if (!stubs_initialized)	// Not using Tcl, nothing to do.
+	return;
+#endif
+
+    reflist = (struct ref*)(win->w_tcl_ref);
+    if (reflist != &refsdeleted)
+    {
+	win->w_tcl_ref = (void *)&refsdeleted;
+	tcldelallrefs(reflist);
+	win->w_tcl_ref = NULL;
+    }
+}
+
+// The End