/* 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.
 */

/*
 * scriptfile.c: functions for dealing with the runtime directories/files
 */

#include "vim.h"

#if defined(FEAT_EVAL) || defined(PROTO)
// The names of packages that once were loaded are remembered.
static garray_T		ga_loaded = {0, 0, sizeof(char_u *), 4, NULL};
#endif

/*
 * Initialize the execution stack.
 */
    void
estack_init(void)
{
    estack_T *entry;

    if (ga_grow(&exestack, 10) == FAIL)
	mch_exit(0);
    entry = ((estack_T *)exestack.ga_data) + exestack.ga_len;
    entry->es_type = ETYPE_TOP;
    entry->es_name = NULL;
    entry->es_lnum = 0;
#ifdef FEAT_EVAL
    entry->es_info.ufunc = NULL;
#endif
    ++exestack.ga_len;
}

/*
 * Add an item to the execution stack.
 * Returns the new entry or NULL when out of memory.
 */
    estack_T *
estack_push(etype_T type, char_u *name, long lnum)
{
    estack_T *entry;

    // If memory allocation fails then we'll pop more than we push, eventually
    // at the top level it will be OK again.
    if (ga_grow(&exestack, 1) == OK)
    {
	entry = ((estack_T *)exestack.ga_data) + exestack.ga_len;
	entry->es_type = type;
	entry->es_name = name;
	entry->es_lnum = lnum;
#ifdef FEAT_EVAL
	entry->es_info.ufunc = NULL;
#endif
	++exestack.ga_len;
	return entry;
    }
    return NULL;
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Add a user function to the execution stack.
 */
    estack_T *
estack_push_ufunc(ufunc_T *ufunc, long lnum)
{
    estack_T *entry = estack_push(ETYPE_UFUNC,
	    ufunc->uf_name_exp != NULL
				  ? ufunc->uf_name_exp : ufunc->uf_name, lnum);
    if (entry != NULL)
	entry->es_info.ufunc = ufunc;
    return entry;
}

/*
 * Return TRUE if "ufunc" with "lnum" is already at the top of the exe stack.
 */
    int
estack_top_is_ufunc(ufunc_T *ufunc, long lnum)
{
    estack_T *entry;

    if (exestack.ga_len == 0)
	return FALSE;
    entry = ((estack_T *)exestack.ga_data) + exestack.ga_len - 1;
    return entry->es_type == ETYPE_UFUNC
	&& STRCMP( entry->es_name, ufunc->uf_name_exp != NULL
				    ? ufunc->uf_name_exp : ufunc->uf_name) == 0
	&& entry->es_lnum == lnum;
}
#endif

/*
 * Take an item off of the execution stack and return it.
 */
    estack_T *
estack_pop(void)
{
    if (exestack.ga_len == 0)
	return NULL;
    --exestack.ga_len;
    return ((estack_T *)exestack.ga_data) + exestack.ga_len;
}

/*
 * Get the current value for <sfile> in allocated memory.
 * "which" is ESTACK_SFILE for <sfile> and ESTACK_STACK for <stack>.
 */
    char_u *
estack_sfile(estack_arg_T which UNUSED)
{
    estack_T	*entry;
#ifdef FEAT_EVAL
    garray_T	ga;
    size_t	len;
    int		idx;
    etype_T	last_type = ETYPE_SCRIPT;
    char	*type_name;
#endif

    entry = ((estack_T *)exestack.ga_data) + exestack.ga_len - 1;
#ifdef FEAT_EVAL
    if (which == ESTACK_SFILE && entry->es_type != ETYPE_UFUNC)
#endif
    {
	if (entry->es_name == NULL)
	    return NULL;
	return vim_strsave(entry->es_name);
    }
#ifdef FEAT_EVAL
    // expand('<sfile>') works in a function for backwards compatibility, but
    // may give an unexpected result.  Disallow it in Vim 9 script.
    if (which == ESTACK_SFILE && in_vim9script())
    {
	int  save_emsg_off = emsg_off;

	if (emsg_off == 1)
	    // f_expand() silences errors but we do want this one
	    emsg_off = 0;
	emsg(_(e_cannot_expand_sfile_in_vim9_function));
	emsg_off = save_emsg_off;
	return NULL;
    }

    // Give information about each stack entry up to the root.
    // For a function we compose the call stack, as it was done in the past:
    //   "function One[123]..Two[456]..Three"
    ga_init2(&ga, sizeof(char), 100);
    for (idx = 0; idx < exestack.ga_len; ++idx)
    {
	entry = ((estack_T *)exestack.ga_data) + idx;
	if (entry->es_name != NULL)
	{
	    long    lnum = 0;
	    char    *dots;

	    len = STRLEN(entry->es_name) + 15;
	    type_name = "";
	    if (entry->es_type != last_type)
	    {
		switch (entry->es_type)
		{
		    case ETYPE_SCRIPT: type_name = "script "; break;
		    case ETYPE_UFUNC: type_name = "function "; break;
		    default: type_name = ""; break;
		}
		last_type = entry->es_type;
	    }
	    len += STRLEN(type_name);
	    if (ga_grow(&ga, (int)len) == FAIL)
		break;
	    if (idx == exestack.ga_len - 1)
		lnum = which == ESTACK_STACK ? SOURCING_LNUM : 0;
	    else
		lnum = entry->es_lnum;
	    dots = idx == exestack.ga_len - 1 ? "" : "..";
	    if (lnum == 0)
		// For the bottom entry of <sfile>: do not add the line number,
		// it is used in <slnum>.  Also leave it out when the number is
		// not set.
		vim_snprintf((char *)ga.ga_data + ga.ga_len, len, "%s%s%s",
				type_name, entry->es_name, dots);
	    else
		vim_snprintf((char *)ga.ga_data + ga.ga_len, len, "%s%s[%ld]%s",
				    type_name, entry->es_name, lnum, dots);
	    ga.ga_len += (int)STRLEN((char *)ga.ga_data + ga.ga_len);
	}
    }

    return (char_u *)ga.ga_data;
#endif
}

/*
 * ":runtime [what] {name}"
 */
    void
ex_runtime(exarg_T *eap)
{
    char_u  *arg = eap->arg;
    char_u  *p = skiptowhite(arg);
    int	    len = (int)(p - arg);
    int	    flags = eap->forceit ? DIP_ALL : 0;

    if (STRNCMP(arg, "START", len) == 0)
    {
	flags += DIP_START + DIP_NORTP;
	arg = skipwhite(arg + len);
    }
    else if (STRNCMP(arg, "OPT", len) == 0)
    {
	flags += DIP_OPT + DIP_NORTP;
	arg = skipwhite(arg + len);
    }
    else if (STRNCMP(arg, "PACK", len) == 0)
    {
	flags += DIP_START + DIP_OPT + DIP_NORTP;
	arg = skipwhite(arg + len);
    }
    else if (STRNCMP(arg, "ALL", len) == 0)
    {
	flags += DIP_START + DIP_OPT;
	arg = skipwhite(arg + len);
    }

    source_runtime(arg, flags);
}

    static void
source_callback(char_u *fname, void *cookie)
{
    (void)do_source(fname, FALSE, DOSO_NONE, cookie);
}

/*
 * Find the file "name" in all directories in "path" and invoke
 * "callback(fname, cookie)".
 * "name" can contain wildcards.
 * When "flags" has DIP_ALL: source all files, otherwise only the first one.
 * When "flags" has DIP_DIR: find directories instead of files.
 * When "flags" has DIP_ERR: give an error message if there is no match.
 *
 * return FAIL when no file could be sourced, OK otherwise.
 */
    int
do_in_path(
    char_u	*path,
    char_u	*name,
    int		flags,
    void	(*callback)(char_u *fname, void *ck),
    void	*cookie)
{
    char_u	*rtp;
    char_u	*np;
    char_u	*buf;
    char_u	*rtp_copy;
    char_u	*tail;
    int		num_files;
    char_u	**files;
    int		i;
    int		did_one = FALSE;
#ifdef AMIGA
    struct Process	*proc = (struct Process *)FindTask(0L);
    APTR		save_winptr = proc->pr_WindowPtr;

    // Avoid a requester here for a volume that doesn't exist.
    proc->pr_WindowPtr = (APTR)-1L;
#endif

    // Make a copy of 'runtimepath'.  Invoking the callback may change the
    // value.
    rtp_copy = vim_strsave(path);
    buf = alloc(MAXPATHL);
    if (buf != NULL && rtp_copy != NULL)
    {
	if (p_verbose > 10 && name != NULL)
	{
	    verbose_enter();
	    smsg(_("Searching for \"%s\" in \"%s\""),
						 (char *)name, (char *)path);
	    verbose_leave();
	}

	// Loop over all entries in 'runtimepath'.
	rtp = rtp_copy;
	while (*rtp != NUL && ((flags & DIP_ALL) || !did_one))
	{
	    size_t buflen;

	    // Copy the path from 'runtimepath' to buf[].
	    copy_option_part(&rtp, buf, MAXPATHL, ",");
	    buflen = STRLEN(buf);

	    // Skip after or non-after directories.
	    if (flags & (DIP_NOAFTER | DIP_AFTER))
	    {
		int is_after = buflen >= 5
				     && STRCMP(buf + buflen - 5, "after") == 0;

		if ((is_after && (flags & DIP_NOAFTER))
			|| (!is_after && (flags & DIP_AFTER)))
		    continue;
	    }

	    if (name == NULL)
	    {
		(*callback)(buf, (void *) &cookie);
		if (!did_one)
		    did_one = (cookie == NULL);
	    }
	    else if (buflen + STRLEN(name) + 2 < MAXPATHL)
	    {
		add_pathsep(buf);
		tail = buf + STRLEN(buf);

		// Loop over all patterns in "name"
		np = name;
		while (*np != NUL && ((flags & DIP_ALL) || !did_one))
		{
		    // Append the pattern from "name" to buf[].
		    copy_option_part(&np, tail, (int)(MAXPATHL - (tail - buf)),
								       "\t ");

		    if (p_verbose > 10)
		    {
			verbose_enter();
			smsg(_("Searching for \"%s\""), buf);
			verbose_leave();
		    }

		    // Expand wildcards, invoke the callback for each match.
		    if (gen_expand_wildcards(1, &buf, &num_files, &files,
				  (flags & DIP_DIR) ? EW_DIR : EW_FILE) == OK)
		    {
			for (i = 0; i < num_files; ++i)
			{
			    (*callback)(files[i], cookie);
			    did_one = TRUE;
			    if (!(flags & DIP_ALL))
				break;
			}
			FreeWild(num_files, files);
		    }
		}
	    }
	}
    }
    vim_free(buf);
    vim_free(rtp_copy);
    if (!did_one && name != NULL)
    {
	char *basepath = path == p_rtp ? "runtimepath" : "packpath";

	if (flags & DIP_ERR)
	    semsg(_(e_dirnotf), basepath, name);
	else if (p_verbose > 0)
	{
	    verbose_enter();
	    smsg(_("not found in '%s': \"%s\""), basepath, name);
	    verbose_leave();
	}
    }

#ifdef AMIGA
    proc->pr_WindowPtr = save_winptr;
#endif

    return did_one ? OK : FAIL;
}

/*
 * Find "name" in "path".  When found, invoke the callback function for
 * it: callback(fname, "cookie")
 * When "flags" has DIP_ALL repeat for all matches, otherwise only the first
 * one is used.
 * Returns OK when at least one match found, FAIL otherwise.
 *
 * If "name" is NULL calls callback for each entry in "path". Cookie is
 * passed by reference in this case, setting it to NULL indicates that callback
 * has done its job.
 */
    static int
do_in_path_and_pp(
    char_u	*path,
    char_u	*name,
    int		flags,
    void	(*callback)(char_u *fname, void *ck),
    void	*cookie)
{
    int		done = FAIL;
    char_u	*s;
    int		len;
    char	*start_dir = "pack/*/start/*/%s";
    char	*opt_dir = "pack/*/opt/*/%s";

    if ((flags & DIP_NORTP) == 0)
	done = do_in_path(path, name, flags, callback, cookie);

    if ((done == FAIL || (flags & DIP_ALL)) && (flags & DIP_START))
    {
	len = (int)(STRLEN(start_dir) + STRLEN(name));
	s = alloc(len);
	if (s == NULL)
	    return FAIL;
	vim_snprintf((char *)s, len, start_dir, name);
	done = do_in_path(p_pp, s, flags, callback, cookie);
	vim_free(s);
    }

    if ((done == FAIL || (flags & DIP_ALL)) && (flags & DIP_OPT))
    {
	len = (int)(STRLEN(opt_dir) + STRLEN(name));
	s = alloc(len);
	if (s == NULL)
	    return FAIL;
	vim_snprintf((char *)s, len, opt_dir, name);
	done = do_in_path(p_pp, s, flags, callback, cookie);
	vim_free(s);
    }

    return done;
}

/*
 * Just like do_in_path_and_pp(), using 'runtimepath' for "path".
 */
    int
do_in_runtimepath(
    char_u	*name,
    int		flags,
    void	(*callback)(char_u *fname, void *ck),
    void	*cookie)
{
    return do_in_path_and_pp(p_rtp, name, flags, callback, cookie);
}

/*
 * Source the file "name" from all directories in 'runtimepath'.
 * "name" can contain wildcards.
 * When "flags" has DIP_ALL: source all files, otherwise only the first one.
 *
 * return FAIL when no file could be sourced, OK otherwise.
 */
    int
source_runtime(char_u *name, int flags)
{
    return source_in_path(p_rtp, name, flags, NULL);
}

/*
 * Just like source_runtime(), but use "path" instead of 'runtimepath'.
 */
    int
source_in_path(char_u *path, char_u *name, int flags, int *ret_sid)
{
    return do_in_path_and_pp(path, name, flags, source_callback, ret_sid);
}


#if defined(FEAT_EVAL) || defined(PROTO)

/*
 * Expand wildcards in "pat" and invoke do_source() for each match.
 */
    static void
source_all_matches(char_u *pat)
{
    int	    num_files;
    char_u  **files;
    int	    i;

    if (gen_expand_wildcards(1, &pat, &num_files, &files, EW_FILE) == OK)
    {
	for (i = 0; i < num_files; ++i)
	    (void)do_source(files[i], FALSE, DOSO_NONE, NULL);
	FreeWild(num_files, files);
    }
}

/*
 * Add the package directory to 'runtimepath'.
 */
    static int
add_pack_dir_to_rtp(char_u *fname)
{
    char_u  *p4, *p3, *p2, *p1, *p;
    char_u  *entry;
    char_u  *insp = NULL;
    int	    c;
    char_u  *new_rtp;
    int	    keep;
    size_t  oldlen;
    size_t  addlen;
    size_t  new_rtp_len;
    char_u  *afterdir = NULL;
    size_t  afterlen = 0;
    char_u  *after_insp = NULL;
    char_u  *ffname = NULL;
    size_t  fname_len;
    char_u  *buf = NULL;
    char_u  *rtp_ffname;
    int	    match;
    int	    retval = FAIL;

    p4 = p3 = p2 = p1 = get_past_head(fname);
    for (p = p1; *p; MB_PTR_ADV(p))
	if (vim_ispathsep_nocolon(*p))
	{
	    p4 = p3; p3 = p2; p2 = p1; p1 = p;
	}

    // now we have:
    // rtp/pack/name/start/name
    //    p4   p3   p2    p1
    //
    // find the part up to "pack" in 'runtimepath'
    c = *++p4; // append pathsep in order to expand symlink
    *p4 = NUL;
    ffname = fix_fname(fname);
    *p4 = c;
    if (ffname == NULL)
	return FAIL;

    // Find "ffname" in "p_rtp", ignoring '/' vs '\' differences.
    // Also stop at the first "after" directory.
    fname_len = STRLEN(ffname);
    buf = alloc(MAXPATHL);
    if (buf == NULL)
	goto theend;
    for (entry = p_rtp; *entry != NUL; )
    {
	char_u *cur_entry = entry;

	copy_option_part(&entry, buf, MAXPATHL, ",");
	if (insp == NULL)
	{
	    add_pathsep(buf);
	    rtp_ffname = fix_fname(buf);
	    if (rtp_ffname == NULL)
		goto theend;
	    match = vim_fnamencmp(rtp_ffname, ffname, fname_len) == 0;
	    vim_free(rtp_ffname);
	    if (match)
		// Insert "ffname" after this entry (and comma).
		insp = entry;
	}

	if ((p = (char_u *)strstr((char *)buf, "after")) != NULL
		&& p > buf
		&& vim_ispathsep(p[-1])
		&& (vim_ispathsep(p[5]) || p[5] == NUL || p[5] == ','))
	{
	    if (insp == NULL)
		// Did not find "ffname" before the first "after" directory,
		// insert it before this entry.
		insp = cur_entry;
	    after_insp = cur_entry;
	    break;
	}
    }

    if (insp == NULL)
	// Both "fname" and "after" not found, append at the end.
	insp = p_rtp + STRLEN(p_rtp);

    // check if rtp/pack/name/start/name/after exists
    afterdir = concat_fnames(fname, (char_u *)"after", TRUE);
    if (afterdir != NULL && mch_isdir(afterdir))
	afterlen = STRLEN(afterdir) + 1; // add one for comma

    oldlen = STRLEN(p_rtp);
    addlen = STRLEN(fname) + 1; // add one for comma
    new_rtp = alloc(oldlen + addlen + afterlen + 1); // add one for NUL
    if (new_rtp == NULL)
	goto theend;

    // We now have 'rtp' parts: {keep}{keep_after}{rest}.
    // Create new_rtp, first: {keep},{fname}
    keep = (int)(insp - p_rtp);
    mch_memmove(new_rtp, p_rtp, keep);
    new_rtp_len = keep;
    if (*insp == NUL)
	new_rtp[new_rtp_len++] = ',';  // add comma before
    mch_memmove(new_rtp + new_rtp_len, fname, addlen - 1);
    new_rtp_len += addlen - 1;
    if (*insp != NUL)
	new_rtp[new_rtp_len++] = ',';  // add comma after

    if (afterlen > 0 && after_insp != NULL)
    {
	int keep_after = (int)(after_insp - p_rtp);

	// Add to new_rtp: {keep},{fname}{keep_after},{afterdir}
	mch_memmove(new_rtp + new_rtp_len, p_rtp + keep,
							keep_after - keep);
	new_rtp_len += keep_after - keep;
	mch_memmove(new_rtp + new_rtp_len, afterdir, afterlen - 1);
	new_rtp_len += afterlen - 1;
	new_rtp[new_rtp_len++] = ',';
	keep = keep_after;
    }

    if (p_rtp[keep] != NUL)
	// Append rest: {keep},{fname}{keep_after},{afterdir}{rest}
	mch_memmove(new_rtp + new_rtp_len, p_rtp + keep, oldlen - keep + 1);
    else
	new_rtp[new_rtp_len] = NUL;

    if (afterlen > 0 && after_insp == NULL)
    {
	// Append afterdir when "after" was not found:
	// {keep},{fname}{rest},{afterdir}
	STRCAT(new_rtp, ",");
	STRCAT(new_rtp, afterdir);
    }

    set_option_value((char_u *)"rtp", 0L, new_rtp, 0);
    vim_free(new_rtp);
    retval = OK;

theend:
    vim_free(buf);
    vim_free(ffname);
    vim_free(afterdir);
    return retval;
}

/*
 * Load scripts in "plugin" and "ftdetect" directories of the package.
 */
    static int
load_pack_plugin(char_u *fname)
{
    static char *plugpat = "%s/plugin/**/*.vim";
    static char *ftpat = "%s/ftdetect/*.vim";
    int		len;
    char_u	*ffname = fix_fname(fname);
    char_u	*pat = NULL;
    int		retval = FAIL;

    if (ffname == NULL)
	return FAIL;
    len = (int)STRLEN(ffname) + (int)STRLEN(ftpat);
    pat = alloc(len);
    if (pat == NULL)
	goto theend;
    vim_snprintf((char *)pat, len, plugpat, ffname);
    source_all_matches(pat);

    {
	char_u *cmd = vim_strsave((char_u *)"g:did_load_filetypes");

	// If runtime/filetype.vim wasn't loaded yet, the scripts will be
	// found when it loads.
	if (cmd != NULL && eval_to_number(cmd) > 0)
	{
	    do_cmdline_cmd((char_u *)"augroup filetypedetect");
	    vim_snprintf((char *)pat, len, ftpat, ffname);
	    source_all_matches(pat);
	    do_cmdline_cmd((char_u *)"augroup END");
	}
	vim_free(cmd);
    }
    vim_free(pat);
    retval = OK;

theend:
    vim_free(ffname);
    return retval;
}

// used for "cookie" of add_pack_plugin()
static int APP_ADD_DIR;
static int APP_LOAD;
static int APP_BOTH;

    static void
add_pack_plugin(char_u *fname, void *cookie)
{
    if (cookie != &APP_LOAD)
    {
	char_u	*buf = alloc(MAXPATHL);
	char_u	*p;
	int	found = FALSE;

	if (buf == NULL)
	    return;
	p = p_rtp;
	while (*p != NUL)
	{
	    copy_option_part(&p, buf, MAXPATHL, ",");
	    if (pathcmp((char *)buf, (char *)fname, -1) == 0)
	    {
		found = TRUE;
		break;
	    }
	}
	vim_free(buf);
	if (!found)
	    // directory is not yet in 'runtimepath', add it
	    if (add_pack_dir_to_rtp(fname) == FAIL)
		return;
    }

    if (cookie != &APP_ADD_DIR)
	load_pack_plugin(fname);
}

/*
 * Add all packages in the "start" directory to 'runtimepath'.
 */
    void
add_pack_start_dirs(void)
{
    do_in_path(p_pp, (char_u *)"pack/*/start/*", DIP_ALL + DIP_DIR,
					       add_pack_plugin, &APP_ADD_DIR);
}

/*
 * Load plugins from all packages in the "start" directory.
 */
    void
load_start_packages(void)
{
    did_source_packages = TRUE;
    do_in_path(p_pp, (char_u *)"pack/*/start/*", DIP_ALL + DIP_DIR,
						  add_pack_plugin, &APP_LOAD);
}

/*
 * ":packloadall"
 * Find plugins in the package directories and source them.
 */
    void
ex_packloadall(exarg_T *eap)
{
    if (!did_source_packages || eap->forceit)
    {
	// First do a round to add all directories to 'runtimepath', then load
	// the plugins. This allows for plugins to use an autoload directory
	// of another plugin.
	add_pack_start_dirs();
	load_start_packages();
    }
}

/*
 * ":packadd[!] {name}"
 */
    void
ex_packadd(exarg_T *eap)
{
    static char *plugpat = "pack/*/%s/%s";
    int		len;
    char	*pat;
    int		round;
    int		res = OK;

    // Round 1: use "start", round 2: use "opt".
    for (round = 1; round <= 2; ++round)
    {
	// Only look under "start" when loading packages wasn't done yet.
	if (round == 1 && did_source_packages)
	    continue;

	len = (int)STRLEN(plugpat) + (int)STRLEN(eap->arg) + 5;
	pat = alloc(len);
	if (pat == NULL)
	    return;
	vim_snprintf(pat, len, plugpat, round == 1 ? "start" : "opt", eap->arg);
	// The first round don't give a "not found" error, in the second round
	// only when nothing was found in the first round.
	res = do_in_path(p_pp, (char_u *)pat,
		DIP_ALL + DIP_DIR + (round == 2 && res == FAIL ? DIP_ERR : 0),
		add_pack_plugin, eap->forceit ? &APP_ADD_DIR : &APP_BOTH);
	vim_free(pat);
    }
}
#endif

/*
 * Sort "gap" and remove duplicate entries.  "gap" is expected to contain a
 * list of file names in allocated memory.
 */
    void
remove_duplicates(garray_T *gap)
{
    int	    i;
    int	    j;
    char_u  **fnames = (char_u **)gap->ga_data;

    sort_strings(fnames, gap->ga_len);
    for (i = gap->ga_len - 1; i > 0; --i)
	if (fnamecmp(fnames[i - 1], fnames[i]) == 0)
	{
	    vim_free(fnames[i]);
	    for (j = i + 1; j < gap->ga_len; ++j)
		fnames[j - 1] = fnames[j];
	    --gap->ga_len;
	}
}

/*
 * Expand color scheme, compiler or filetype names.
 * Search from 'runtimepath':
 *   'runtimepath'/{dirnames}/{pat}.vim
 * When "flags" has DIP_START: search also from 'start' of 'packpath':
 *   'packpath'/pack/ * /start/ * /{dirnames}/{pat}.vim
 * When "flags" has DIP_OPT: search also from 'opt' of 'packpath':
 *   'packpath'/pack/ * /opt/ * /{dirnames}/{pat}.vim
 * "dirnames" is an array with one or more directory names.
 */
    int
ExpandRTDir(
    char_u	*pat,
    int		flags,
    int		*num_file,
    char_u	***file,
    char	*dirnames[])
{
    char_u	*s;
    char_u	*e;
    char_u	*match;
    garray_T	ga;
    int		i;
    int		pat_len;

    *num_file = 0;
    *file = NULL;
    pat_len = (int)STRLEN(pat);
    ga_init2(&ga, (int)sizeof(char *), 10);

    for (i = 0; dirnames[i] != NULL; ++i)
    {
	s = alloc(STRLEN(dirnames[i]) + pat_len + 7);
	if (s == NULL)
	{
	    ga_clear_strings(&ga);
	    return FAIL;
	}
	sprintf((char *)s, "%s/%s*.vim", dirnames[i], pat);
	globpath(p_rtp, s, &ga, 0);
	vim_free(s);
    }

    if (flags & DIP_START) {
	for (i = 0; dirnames[i] != NULL; ++i)
	{
	    s = alloc(STRLEN(dirnames[i]) + pat_len + 22);
	    if (s == NULL)
	    {
		ga_clear_strings(&ga);
		return FAIL;
	    }
	    sprintf((char *)s, "pack/*/start/*/%s/%s*.vim", dirnames[i], pat);
	    globpath(p_pp, s, &ga, 0);
	    vim_free(s);
	}
    }

    if (flags & DIP_OPT) {
	for (i = 0; dirnames[i] != NULL; ++i)
	{
	    s = alloc(STRLEN(dirnames[i]) + pat_len + 20);
	    if (s == NULL)
	    {
		ga_clear_strings(&ga);
		return FAIL;
	    }
	    sprintf((char *)s, "pack/*/opt/*/%s/%s*.vim", dirnames[i], pat);
	    globpath(p_pp, s, &ga, 0);
	    vim_free(s);
	}
    }

    for (i = 0; i < ga.ga_len; ++i)
    {
	match = ((char_u **)ga.ga_data)[i];
	s = match;
	e = s + STRLEN(s);
	if (e - 4 > s && STRNICMP(e - 4, ".vim", 4) == 0)
	{
	    e -= 4;
	    for (s = e; s > match; MB_PTR_BACK(match, s))
		if (s < match || vim_ispathsep(*s))
		    break;
	    ++s;
	    *e = NUL;
	    mch_memmove(match, s, e - s + 1);
	}
    }

    if (ga.ga_len == 0)
	return FAIL;

    // Sort and remove duplicates which can happen when specifying multiple
    // directories in dirnames.
    remove_duplicates(&ga);

    *file = ga.ga_data;
    *num_file = ga.ga_len;
    return OK;
}

/*
 * Expand loadplugin names:
 * 'packpath'/pack/ * /opt/{pat}
 */
    int
ExpandPackAddDir(
    char_u	*pat,
    int		*num_file,
    char_u	***file)
{
    char_u	*s;
    char_u	*e;
    char_u	*match;
    garray_T	ga;
    int		i;
    int		pat_len;

    *num_file = 0;
    *file = NULL;
    pat_len = (int)STRLEN(pat);
    ga_init2(&ga, (int)sizeof(char *), 10);

    s = alloc(pat_len + 26);
    if (s == NULL)
    {
	ga_clear_strings(&ga);
	return FAIL;
    }
    sprintf((char *)s, "pack/*/opt/%s*", pat);
    globpath(p_pp, s, &ga, 0);
    vim_free(s);

    for (i = 0; i < ga.ga_len; ++i)
    {
	match = ((char_u **)ga.ga_data)[i];
	s = gettail(match);
	e = s + STRLEN(s);
	mch_memmove(match, s, e - s + 1);
    }

    if (ga.ga_len == 0)
	return FAIL;

    // Sort and remove duplicates which can happen when specifying multiple
    // directories in dirnames.
    remove_duplicates(&ga);

    *file = ga.ga_data;
    *num_file = ga.ga_len;
    return OK;
}

    static void
cmd_source(char_u *fname, exarg_T *eap)
{
    if (*fname == NUL)
	emsg(_(e_argreq));

    else if (eap != NULL && eap->forceit)
	// ":source!": read Normal mode commands
	// Need to execute the commands directly.  This is required at least
	// for:
	// - ":g" command busy
	// - after ":argdo", ":windo" or ":bufdo"
	// - another command follows
	// - inside a loop
	openscript(fname, global_busy || listcmd_busy || eap->nextcmd != NULL
#ifdef FEAT_EVAL
						 || eap->cstack->cs_idx >= 0
#endif
						 );

    // ":source" read ex commands
    else if (do_source(fname, FALSE, DOSO_NONE, NULL) == FAIL)
	semsg(_(e_notopen), fname);
}

/*
 * ":source {fname}"
 */
    void
ex_source(exarg_T *eap)
{
#ifdef FEAT_BROWSE
    if (cmdmod.cmod_flags & CMOD_BROWSE)
    {
	char_u *fname = NULL;

	fname = do_browse(0, (char_u *)_("Source Vim script"), eap->arg,
				      NULL, NULL,
				      (char_u *)_(BROWSE_FILTER_MACROS), NULL);
	if (fname != NULL)
	{
	    cmd_source(fname, eap);
	    vim_free(fname);
	}
    }
    else
#endif
	cmd_source(eap->arg, eap);
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * ":options"
 */
    void
ex_options(
    exarg_T	*eap UNUSED)
{
    char_u  buf[500];
    int	    multi_mods = 0;

    buf[0] = NUL;
    (void)add_win_cmd_modifers(buf, &cmdmod, &multi_mods);

    vim_setenv((char_u *)"OPTWIN_CMD", buf);
    cmd_source((char_u *)SYS_OPTWIN_FILE, NULL);
}
#endif

/*
 * ":source" and associated commands.
 */

#ifdef FEAT_EVAL
/*
 * Return the address holding the next breakpoint line for a source cookie.
 */
    linenr_T *
source_breakpoint(void *cookie)
{
    return &((source_cookie_T *)cookie)->breakpoint;
}

/*
 * Return the address holding the debug tick for a source cookie.
 */
    int *
source_dbg_tick(void *cookie)
{
    return &((source_cookie_T *)cookie)->dbg_tick;
}

/*
 * Return the nesting level for a source cookie.
 */
    int
source_level(void *cookie)
{
    return ((source_cookie_T *)cookie)->level;
}

/*
 * Return the readahead line. Note that the pointer may become invalid when
 * getting the next line, if it's concatenated with the next one.
 */
    char_u *
source_nextline(void *cookie)
{
    return ((source_cookie_T *)cookie)->nextline;
}
#endif

#if (defined(MSWIN) && defined(FEAT_CSCOPE)) || defined(HAVE_FD_CLOEXEC)
# define USE_FOPEN_NOINH
/*
 * Special function to open a file without handle inheritance.
 * When possible the handle is closed on exec().
 */
    static FILE *
fopen_noinh_readbin(char *filename)
{
# ifdef MSWIN
    int	fd_tmp = mch_open(filename, O_RDONLY | O_BINARY | O_NOINHERIT, 0);
# else
    int	fd_tmp = mch_open(filename, O_RDONLY, 0);
# endif

    if (fd_tmp == -1)
	return NULL;

# ifdef HAVE_FD_CLOEXEC
    {
	int fdflags = fcntl(fd_tmp, F_GETFD);
	if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0)
	    (void)fcntl(fd_tmp, F_SETFD, fdflags | FD_CLOEXEC);
    }
# endif

    return fdopen(fd_tmp, READBIN);
}
#endif

/*
 * do_source: Read the file "fname" and execute its lines as EX commands.
 * When "ret_sid" is not NULL and we loaded the script before, don't load it
 * again.
 *
 * This function may be called recursively!
 *
 * Return FAIL if file could not be opened, OK otherwise.
 * If a scriptitem_T was found or created "*ret_sid" is set to the SID.
 */
    int
do_source(
    char_u	*fname,
    int		check_other,	    // check for .vimrc and _vimrc
    int		is_vimrc,	    // DOSO_ value
    int		*ret_sid UNUSED)
{
    source_cookie_T	    cookie;
    char_u		    *p;
    char_u		    *fname_exp;
    char_u		    *firstline = NULL;
    int			    retval = FAIL;
    sctx_T		    save_current_sctx;
#ifdef FEAT_EVAL
    static scid_T	    last_current_SID = 0;
    static int		    last_current_SID_seq = 0;
    funccal_entry_T	    funccalp_entry;
    int			    save_debug_break_level = debug_break_level;
    int			    sid;
    scriptitem_T	    *si = NULL;
    int			    save_estack_compiling = estack_compiling;
#endif
#ifdef STARTUPTIME
    struct timeval	    tv_rel;
    struct timeval	    tv_start;
#endif
#ifdef FEAT_PROFILE
    proftime_T		    wait_start;
#endif
    int			    trigger_source_post = FALSE;
    ESTACK_CHECK_DECLARATION

    p = expand_env_save(fname);
    if (p == NULL)
	return retval;
    fname_exp = fix_fname(p);
    vim_free(p);
    if (fname_exp == NULL)
	return retval;
    if (mch_isdir(fname_exp))
    {
	smsg(_("Cannot source a directory: \"%s\""), fname);
	goto theend;
    }
#ifdef FEAT_EVAL
    estack_compiling = FALSE;

    // See if we loaded this script before.
    for (sid = script_items.ga_len; sid > 0; --sid)
    {
	// We used to check inode here, but that doesn't work:
	// - If a script is edited and written, it may get a different
	//   inode number, even though to the user it is the same script.
	// - If a script is deleted and another script is written, with a
	//   different name, the inode may be re-used.
	si = SCRIPT_ITEM(sid);
	if (si->sn_name != NULL && fnamecmp(si->sn_name, fname_exp) == 0)
		// Found it!
		break;
    }
    if (sid > 0 && ret_sid != NULL)
    {
	// Already loaded and no need to load again, return here.
	*ret_sid = sid;
	retval = OK;
	goto theend;
    }
#endif

    // Apply SourceCmd autocommands, they should get the file and source it.
    if (has_autocmd(EVENT_SOURCECMD, fname_exp, NULL)
	    && apply_autocmds(EVENT_SOURCECMD, fname_exp, fname_exp,
							       FALSE, curbuf))
    {
#ifdef FEAT_EVAL
	retval = aborting() ? FAIL : OK;
#else
	retval = OK;
#endif
	if (retval == OK)
	    // Apply SourcePost autocommands.
	    apply_autocmds(EVENT_SOURCEPOST, fname_exp, fname_exp,
								FALSE, curbuf);
	goto theend;
    }

    // Apply SourcePre autocommands, they may get the file.
    apply_autocmds(EVENT_SOURCEPRE, fname_exp, fname_exp, FALSE, curbuf);

#ifdef USE_FOPEN_NOINH
    cookie.fp = fopen_noinh_readbin((char *)fname_exp);
#else
    cookie.fp = mch_fopen((char *)fname_exp, READBIN);
#endif
    if (cookie.fp == NULL && check_other)
    {
	// Try again, replacing file name ".vimrc" by "_vimrc" or vice versa,
	// and ".exrc" by "_exrc" or vice versa.
	p = gettail(fname_exp);
	if ((*p == '.' || *p == '_')
		&& (STRICMP(p + 1, "vimrc") == 0
		    || STRICMP(p + 1, "gvimrc") == 0
		    || STRICMP(p + 1, "exrc") == 0))
	{
	    if (*p == '_')
		*p = '.';
	    else
		*p = '_';
#ifdef USE_FOPEN_NOINH
	    cookie.fp = fopen_noinh_readbin((char *)fname_exp);
#else
	    cookie.fp = mch_fopen((char *)fname_exp, READBIN);
#endif
	}
    }

    if (cookie.fp == NULL)
    {
	if (p_verbose > 0)
	{
	    verbose_enter();
	    if (SOURCING_NAME == NULL)
		smsg(_("could not source \"%s\""), fname);
	    else
		smsg(_("line %ld: could not source \"%s\""),
							SOURCING_LNUM, fname);
	    verbose_leave();
	}
	goto theend;
    }

    // The file exists.
    // - In verbose mode, give a message.
    // - For a vimrc file, may want to set 'compatible', call vimrc_found().
    if (p_verbose > 1)
    {
	verbose_enter();
	if (SOURCING_NAME == NULL)
	    smsg(_("sourcing \"%s\""), fname);
	else
	    smsg(_("line %ld: sourcing \"%s\""), SOURCING_LNUM, fname);
	verbose_leave();
    }
    if (is_vimrc == DOSO_VIMRC)
	vimrc_found(fname_exp, (char_u *)"MYVIMRC");
    else if (is_vimrc == DOSO_GVIMRC)
	vimrc_found(fname_exp, (char_u *)"MYGVIMRC");

#ifdef USE_CRNL
    // If no automatic file format: Set default to CR-NL.
    if (*p_ffs == NUL)
	cookie.fileformat = EOL_DOS;
    else
	cookie.fileformat = EOL_UNKNOWN;
    cookie.error = FALSE;
#endif

    cookie.nextline = NULL;
    cookie.sourcing_lnum = 0;
    cookie.finished = FALSE;

#ifdef FEAT_EVAL
    // Check if this script has a breakpoint.
    cookie.breakpoint = dbg_find_breakpoint(TRUE, fname_exp, (linenr_T)0);
    cookie.fname = fname_exp;
    cookie.dbg_tick = debug_tick;

    cookie.level = ex_nesting_level;
#endif

    // Keep the sourcing name/lnum, for recursive calls.
    estack_push(ETYPE_SCRIPT, fname_exp, 0);
    ESTACK_CHECK_SETUP

#ifdef STARTUPTIME
    if (time_fd != NULL)
	time_push(&tv_rel, &tv_start);
#endif

    save_current_sctx = current_sctx;
    current_sctx.sc_version = 1;  // default script version

#ifdef FEAT_EVAL
# ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
	prof_child_enter(&wait_start);		// entering a child now
# endif

    // Don't use local function variables, if called from a function.
    // Also starts profiling timer for nested script.
    save_funccal(&funccalp_entry);

    current_sctx.sc_lnum = 0;

    // Check if this script was sourced before to finds its SID.
    // Always use a new sequence number.
    current_sctx.sc_seq = ++last_current_SID_seq;
    if (sid > 0)
    {
	hashtab_T	*ht;
	int		todo;
	hashitem_T	*hi;
	dictitem_T	*di;

	// loading the same script again
	si->sn_state = SN_STATE_RELOAD;
	current_sctx.sc_sid = sid;

	// Script-local variables remain but "const" can be set again.
	// In Vim9 script variables will be cleared when "vim9script" is
	// encountered without the "noclear" argument.
	ht = &SCRIPT_VARS(sid);
	todo = (int)ht->ht_used;
	for (hi = ht->ht_array; todo > 0; ++hi)
	    if (!HASHITEM_EMPTY(hi))
	    {
		--todo;
		di = HI2DI(hi);
		di->di_flags |= DI_FLAGS_RELOAD;
	    }
	// imports can be redefined once
	mark_imports_for_reload(sid);

	// reset version, "vim9script" may have been added or removed.
	si->sn_version = 1;
    }
    else
    {
	// It's new, generate a new SID.
	current_sctx.sc_sid = ++last_current_SID;
	if (ga_grow(&script_items,
		     (int)(current_sctx.sc_sid - script_items.ga_len)) == FAIL)
	    goto almosttheend;
	while (script_items.ga_len < current_sctx.sc_sid)
	{
	    si = ALLOC_CLEAR_ONE(scriptitem_T);
	    if (si == NULL)
		goto almosttheend;
	    ++script_items.ga_len;
	    SCRIPT_ITEM(script_items.ga_len) = si;
	    si->sn_name = NULL;
	    si->sn_version = 1;

	    // Allocate the local script variables to use for this script.
	    new_script_vars(script_items.ga_len);
	    ga_init2(&si->sn_var_vals, sizeof(svar_T), 10);
	    hash_init(&si->sn_all_vars.dv_hashtab);
	    ga_init2(&si->sn_imports, sizeof(imported_T), 10);
	    ga_init2(&si->sn_type_list, sizeof(type_T), 10);
# ifdef FEAT_PROFILE
	    si->sn_prof_on = FALSE;
# endif
	}
	si = SCRIPT_ITEM(current_sctx.sc_sid);
	si->sn_name = fname_exp;
	fname_exp = vim_strsave(si->sn_name);  // used for autocmd
	if (ret_sid != NULL)
	    *ret_sid = current_sctx.sc_sid;

	// Used to check script variable index is still valid.
	si->sn_script_seq = current_sctx.sc_seq;
    }

# ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
    {
	int	forceit;

	// Check if we do profiling for this script.
	if (!si->sn_prof_on && has_profiling(TRUE, si->sn_name, &forceit))
	{
	    script_do_profile(si);
	    si->sn_pr_force = forceit;
	}
	if (si->sn_prof_on)
	{
	    ++si->sn_pr_count;
	    profile_start(&si->sn_pr_start);
	    profile_zero(&si->sn_pr_children);
	}
    }
# endif
#endif

    cookie.conv.vc_type = CONV_NONE;		// no conversion

    // Read the first line so we can check for a UTF-8 BOM.
    firstline = getsourceline(0, (void *)&cookie, 0, TRUE);
    if (firstline != NULL && STRLEN(firstline) >= 3 && firstline[0] == 0xef
			      && firstline[1] == 0xbb && firstline[2] == 0xbf)
    {
	// Found BOM; setup conversion, skip over BOM and recode the line.
	convert_setup(&cookie.conv, (char_u *)"utf-8", p_enc);
	p = string_convert(&cookie.conv, firstline + 3, NULL);
	if (p == NULL)
	    p = vim_strsave(firstline + 3);
	if (p != NULL)
	{
	    vim_free(firstline);
	    firstline = p;
	}
    }

    // Call do_cmdline, which will call getsourceline() to get the lines.
    do_cmdline(firstline, getsourceline, (void *)&cookie,
				     DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_REPEAT);
    retval = OK;

#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
    {
	// Get "si" again, "script_items" may have been reallocated.
	si = SCRIPT_ITEM(current_sctx.sc_sid);
	if (si->sn_prof_on)
	{
	    profile_end(&si->sn_pr_start);
	    profile_sub_wait(&wait_start, &si->sn_pr_start);
	    profile_add(&si->sn_pr_total, &si->sn_pr_start);
	    profile_self(&si->sn_pr_self, &si->sn_pr_start,
							 &si->sn_pr_children);
	}
    }
#endif

    if (got_int)
	emsg(_(e_interr));
    ESTACK_CHECK_NOW
    estack_pop();
    if (p_verbose > 1)
    {
	verbose_enter();
	smsg(_("finished sourcing %s"), fname);
	if (SOURCING_NAME != NULL)
	    smsg(_("continuing in %s"), SOURCING_NAME);
	verbose_leave();
    }
#ifdef STARTUPTIME
    if (time_fd != NULL)
    {
	vim_snprintf((char *)IObuff, IOSIZE, "sourcing %s", fname);
	time_msg((char *)IObuff, &tv_start);
	time_pop(&tv_rel);
    }
#endif

    if (!got_int)
	trigger_source_post = TRUE;

#ifdef FEAT_EVAL
    // After a "finish" in debug mode, need to break at first command of next
    // sourced file.
    if (save_debug_break_level > ex_nesting_level
	    && debug_break_level == ex_nesting_level)
	++debug_break_level;
#endif

#ifdef FEAT_EVAL
almosttheend:
    // Get "si" again, "script_items" may have been reallocated.
    si = SCRIPT_ITEM(current_sctx.sc_sid);
    if (si->sn_save_cpo != NULL)
    {
	if (STRCMP(p_cpo, CPO_VIM) != 0)
	{
	    char_u *f;
	    char_u *t;

	    // 'cpo' was changed in the script.  Apply the same change to the
	    // saved value, if possible.
	    for (f = (char_u *)CPO_VIM; *f != NUL; ++f)
		if (vim_strchr(p_cpo, *f) == NULL
			&& (t = vim_strchr(si->sn_save_cpo, *f)) != NULL)
		    // flag was removed, also remove it from the saved 'cpo'
		    mch_memmove(t, t + 1, STRLEN(t));
	    for (f = p_cpo; *f != NUL; ++f)
		if (vim_strchr((char_u *)CPO_VIM, *f) == NULL
			&& vim_strchr(si->sn_save_cpo, *f) == NULL)
		{
		    // flag was added, also add it to the saved 'cpo'
		    t = alloc(STRLEN(si->sn_save_cpo) + 2);
		    if (t != NULL)
		    {
			*t = *f;
			STRCPY(t + 1, si->sn_save_cpo);
			vim_free(si->sn_save_cpo);
			si->sn_save_cpo = t;
		    }
		}
	}
	set_option_value((char_u *)"cpo", 0L, si->sn_save_cpo, OPT_NO_REDRAW);
	VIM_CLEAR(si->sn_save_cpo);
    }

    restore_funccal();
# ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
	prof_child_exit(&wait_start);		// leaving a child now
# endif
#endif
    current_sctx = save_current_sctx;

    fclose(cookie.fp);
    vim_free(cookie.nextline);
    vim_free(firstline);
    convert_setup(&cookie.conv, NULL, NULL);

    if (trigger_source_post)
	apply_autocmds(EVENT_SOURCEPOST, fname_exp, fname_exp, FALSE, curbuf);

theend:
    vim_free(fname_exp);
#ifdef FEAT_EVAL
    estack_compiling = save_estack_compiling;
#endif
    return retval;
}

#if defined(FEAT_EVAL) || defined(PROTO)

/*
 * ":scriptnames"
 */
    void
ex_scriptnames(exarg_T *eap)
{
    int i;

    if (eap->addr_count > 0)
    {
	// :script {scriptId}: edit the script
	if (!SCRIPT_ID_VALID(eap->line2))
	    emsg(_(e_invarg));
	else
	{
	    eap->arg = SCRIPT_ITEM(eap->line2)->sn_name;
	    do_exedit(eap, NULL);
	}
	return;
    }

    for (i = 1; i <= script_items.ga_len && !got_int; ++i)
	if (SCRIPT_ITEM(i)->sn_name != NULL)
	{
	    home_replace(NULL, SCRIPT_ITEM(i)->sn_name,
						    NameBuff, MAXPATHL, TRUE);
	    smsg("%3d: %s", i, NameBuff);
	}
}

# if defined(BACKSLASH_IN_FILENAME) || defined(PROTO)
/*
 * Fix slashes in the list of script names for 'shellslash'.
 */
    void
scriptnames_slash_adjust(void)
{
    int i;

    for (i = 1; i <= script_items.ga_len; ++i)
	if (SCRIPT_ITEM(i)->sn_name != NULL)
	    slash_adjust(SCRIPT_ITEM(i)->sn_name);
}
# endif

/*
 * Get a pointer to a script name.  Used for ":verbose set".
 * Message appended to "Last set from "
 */
    char_u *
get_scriptname(scid_T id)
{
    if (id == SID_MODELINE)
	return (char_u *)_("modeline");
    if (id == SID_CMDARG)
	return (char_u *)_("--cmd argument");
    if (id == SID_CARG)
	return (char_u *)_("-c argument");
    if (id == SID_ENV)
	return (char_u *)_("environment variable");
    if (id == SID_ERROR)
	return (char_u *)_("error handler");
    if (id == SID_WINLAYOUT)
	return (char_u *)_("changed window size");
    return SCRIPT_ITEM(id)->sn_name;
}

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

    for (i = script_items.ga_len; i > 0; --i)
    {
	scriptitem_T *si = SCRIPT_ITEM(i);

	// the variables themselves are cleared in evalvars_clear()
	vim_free(si->sn_vars);

	vim_free(si->sn_name);
	free_imports_and_script_vars(i);
	free_string_option(si->sn_save_cpo);
#  ifdef FEAT_PROFILE
	ga_clear(&si->sn_prl_ga);
#  endif
	vim_free(si);
    }
    ga_clear(&script_items);
}

    void
free_autoload_scriptnames(void)
{
    ga_clear_strings(&ga_loaded);
}
# endif

#endif

    linenr_T
get_sourced_lnum(
	char_u *(*fgetline)(int, void *, int, getline_opt_T),
	void *cookie)
{
    return fgetline == getsourceline
			? ((source_cookie_T *)cookie)->sourcing_lnum
			: SOURCING_LNUM;
}

    static char_u *
get_one_sourceline(source_cookie_T *sp)
{
    garray_T		ga;
    int			len;
    int			c;
    char_u		*buf;
#ifdef USE_CRNL
    int			has_cr;		// CR-LF found
#endif
    int			have_read = FALSE;

    // use a growarray to store the sourced line
    ga_init2(&ga, 1, 250);

    // Loop until there is a finished line (or end-of-file).
    ++sp->sourcing_lnum;
    for (;;)
    {
	// make room to read at least 120 (more) characters
	if (ga_grow(&ga, 120) == FAIL)
	    break;
	buf = (char_u *)ga.ga_data;

	if (fgets((char *)buf + ga.ga_len, ga.ga_maxlen - ga.ga_len,
							      sp->fp) == NULL)
	    break;
	len = ga.ga_len + (int)STRLEN(buf + ga.ga_len);
#ifdef USE_CRNL
	// Ignore a trailing CTRL-Z, when in Dos mode.	Only recognize the
	// CTRL-Z by its own, or after a NL.
	if (	   (len == 1 || (len >= 2 && buf[len - 2] == '\n'))
		&& sp->fileformat == EOL_DOS
		&& buf[len - 1] == Ctrl_Z)
	{
	    buf[len - 1] = NUL;
	    break;
	}
#endif

	have_read = TRUE;
	ga.ga_len = len;

	// If the line was longer than the buffer, read more.
	if (ga.ga_maxlen - ga.ga_len == 1 && buf[len - 1] != '\n')
	    continue;

	if (len >= 1 && buf[len - 1] == '\n')	// remove trailing NL
	{
#ifdef USE_CRNL
	    has_cr = (len >= 2 && buf[len - 2] == '\r');
	    if (sp->fileformat == EOL_UNKNOWN)
	    {
		if (has_cr)
		    sp->fileformat = EOL_DOS;
		else
		    sp->fileformat = EOL_UNIX;
	    }

	    if (sp->fileformat == EOL_DOS)
	    {
		if (has_cr)	    // replace trailing CR
		{
		    buf[len - 2] = '\n';
		    --len;
		    --ga.ga_len;
		}
		else	    // lines like ":map xx yy^M" will have failed
		{
		    if (!sp->error)
		    {
			msg_source(HL_ATTR(HLF_W));
			emsg(_("W15: Warning: Wrong line separator, ^M may be missing"));
		    }
		    sp->error = TRUE;
		    sp->fileformat = EOL_UNIX;
		}
	    }
#endif
	    // The '\n' is escaped if there is an odd number of ^V's just
	    // before it, first set "c" just before the 'V's and then check
	    // len&c parities (is faster than ((len-c)%2 == 0)) -- Acevedo
	    for (c = len - 2; c >= 0 && buf[c] == Ctrl_V; c--)
		;
	    if ((len & 1) != (c & 1))	// escaped NL, read more
	    {
		++sp->sourcing_lnum;
		continue;
	    }

	    buf[len - 1] = NUL;		// remove the NL
	}

	// Check for ^C here now and then, so recursive :so can be broken.
	line_breakcheck();
	break;
    }

    if (have_read)
	return (char_u *)ga.ga_data;

    vim_free(ga.ga_data);
    return NULL;
}

/*
 * Get one full line from a sourced file.
 * Called by do_cmdline() when it's called from do_source().
 *
 * Return a pointer to the line in allocated memory.
 * Return NULL for end-of-file or some error.
 */
    char_u *
getsourceline(
	int c UNUSED,
	void *cookie,
	int indent UNUSED,
	getline_opt_T options)
{
    source_cookie_T	*sp = (source_cookie_T *)cookie;
    char_u		*line;
    char_u		*p;
    int			do_vim9_all = in_vim9script()
					      && options == GETLINE_CONCAT_ALL;
    int			do_bar_cont = do_vim9_all
					 || options == GETLINE_CONCAT_CONTBAR;

#ifdef FEAT_EVAL
    // If breakpoints have been added/deleted need to check for it.
    if (sp->dbg_tick < debug_tick)
    {
	sp->breakpoint = dbg_find_breakpoint(TRUE, sp->fname, SOURCING_LNUM);
	sp->dbg_tick = debug_tick;
    }
# ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
	script_line_end();
# endif
#endif

    // Set the current sourcing line number.
    SOURCING_LNUM = sp->sourcing_lnum + 1;

    // Get current line.  If there is a read-ahead line, use it, otherwise get
    // one now.  "fp" is NULL if actually using a string.
    if (sp->finished || sp->fp == NULL)
	line = NULL;
    else if (sp->nextline == NULL)
	line = get_one_sourceline(sp);
    else
    {
	line = sp->nextline;
	sp->nextline = NULL;
	++sp->sourcing_lnum;
    }
#ifdef FEAT_PROFILE
    if (line != NULL && do_profiling == PROF_YES)
	script_line_start();
#endif

    // Only concatenate lines starting with a \ when 'cpoptions' doesn't
    // contain the 'C' flag.
    if (line != NULL && options != GETLINE_NONE
				      && vim_strchr(p_cpo, CPO_CONCAT) == NULL)
    {
	int comment_char = in_vim9script() ? '#' : '"';

	// compensate for the one line read-ahead
	--sp->sourcing_lnum;

	// Get the next line and concatenate it when it starts with a
	// backslash. We always need to read the next line, keep it in
	// sp->nextline.
	/* Also check for a comment in between continuation lines: "\ */
	// Also check for a Vim9 comment, empty line, line starting with '|',
	// but not "||".
	sp->nextline = get_one_sourceline(sp);
	if (sp->nextline != NULL
		&& (*(p = skipwhite(sp->nextline)) == '\\'
			      || (p[0] == comment_char
						&& p[1] == '\\' && p[2] == ' ')
			      || (do_vim9_all && (*p == NUL
						     || vim9_comment_start(p)))
			      || (do_bar_cont && p[0] == '|' && p[1] != '|')))
	{
	    garray_T    ga;

	    ga_init2(&ga, (int)sizeof(char_u), 400);
	    ga_concat(&ga, line);
	    if (*p == '\\')
		ga_concat(&ga, p + 1);
	    else if (*p == '|')
	    {
		ga_concat(&ga, (char_u *)" ");
		ga_concat(&ga, p);
	    }
	    for (;;)
	    {
		vim_free(sp->nextline);
		sp->nextline = get_one_sourceline(sp);
		if (sp->nextline == NULL)
		    break;
		p = skipwhite(sp->nextline);
		if (*p == '\\' || (do_bar_cont && p[0] == '|' && p[1] != '|'))
		{
		    // Adjust the growsize to the current length to speed up
		    // concatenating many lines.
		    if (ga.ga_len > 400)
		    {
			if (ga.ga_len > 8000)
			    ga.ga_growsize = 8000;
			else
			    ga.ga_growsize = ga.ga_len;
		    }
		    if (*p == '\\')
			ga_concat(&ga, p + 1);
		    else
		    {
			ga_concat(&ga, (char_u *)" ");
			ga_concat(&ga, p);
		    }
		}
		else if (!(p[0] == (comment_char)
						&& p[1] == '\\' && p[2] == ' ')
		     && !(do_vim9_all && (*p == NUL || vim9_comment_start(p))))
		    break;
		/* drop a # comment or "\ comment line */
	    }
	    ga_append(&ga, NUL);
	    vim_free(line);
	    line = ga.ga_data;
	}
    }

    if (line != NULL && sp->conv.vc_type != CONV_NONE)
    {
	char_u	*s;

	// Convert the encoding of the script line.
	s = string_convert(&sp->conv, line, NULL);
	if (s != NULL)
	{
	    vim_free(line);
	    line = s;
	}
    }

#ifdef FEAT_EVAL
    // Did we encounter a breakpoint?
    if (sp->breakpoint != 0 && sp->breakpoint <= SOURCING_LNUM)
    {
	dbg_breakpoint(sp->fname, SOURCING_LNUM);
	// Find next breakpoint.
	sp->breakpoint = dbg_find_breakpoint(TRUE, sp->fname, SOURCING_LNUM);
	sp->dbg_tick = debug_tick;
    }
#endif

    return line;
}

/*
 * ":scriptencoding": Set encoding conversion for a sourced script.
 */
    void
ex_scriptencoding(exarg_T *eap)
{
    source_cookie_T	*sp;
    char_u		*name;

    if (!getline_equal(eap->getline, eap->cookie, getsourceline))
    {
	emsg(_("E167: :scriptencoding used outside of a sourced file"));
	return;
    }

    if (*eap->arg != NUL)
    {
	name = enc_canonize(eap->arg);
	if (name == NULL)	// out of memory
	    return;
    }
    else
	name = eap->arg;

    // Setup for conversion from the specified encoding to 'encoding'.
    sp = (source_cookie_T *)getline_cookie(eap->getline, eap->cookie);
    convert_setup(&sp->conv, name, p_enc);

    if (name != eap->arg)
	vim_free(name);
}

/*
 * ":scriptversion": Set Vim script version for a sourced script.
 */
    void
ex_scriptversion(exarg_T *eap UNUSED)
{
    int		nr;

    if (!getline_equal(eap->getline, eap->cookie, getsourceline))
    {
	emsg(_("E984: :scriptversion used outside of a sourced file"));
	return;
    }
    if (in_vim9script())
    {
	emsg(_(e_cannot_use_scriptversion_after_vim9script));
	return;
    }

    nr = getdigits(&eap->arg);
    if (nr == 0 || *eap->arg != NUL)
	emsg(_(e_invarg));
    else if (nr > SCRIPT_VERSION_MAX)
	semsg(_("E999: scriptversion not supported: %d"), nr);
    else
    {
	current_sctx.sc_version = nr;
#ifdef FEAT_EVAL
	SCRIPT_ITEM(current_sctx.sc_sid)->sn_version = nr;
#endif
    }
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * ":finish": Mark a sourced file as finished.
 */
    void
ex_finish(exarg_T *eap)
{
    if (getline_equal(eap->getline, eap->cookie, getsourceline))
	do_finish(eap, FALSE);
    else
	emsg(_("E168: :finish used outside of a sourced file"));
}

/*
 * Mark a sourced file as finished.  Possibly makes the ":finish" pending.
 * Also called for a pending finish at the ":endtry" or after returning from
 * an extra do_cmdline().  "reanimate" is used in the latter case.
 */
    void
do_finish(exarg_T *eap, int reanimate)
{
    int		idx;

    if (reanimate)
	((source_cookie_T *)getline_cookie(eap->getline,
					      eap->cookie))->finished = FALSE;

    // Cleanup (and inactivate) conditionals, but stop when a try conditional
    // not in its finally clause (which then is to be executed next) is found.
    // In this case, make the ":finish" pending for execution at the ":endtry".
    // Otherwise, finish normally.
    idx = cleanup_conditionals(eap->cstack, 0, TRUE);
    if (idx >= 0)
    {
	eap->cstack->cs_pending[idx] = CSTP_FINISH;
	report_make_pending(CSTP_FINISH, NULL);
    }
    else
	((source_cookie_T *)getline_cookie(eap->getline,
					       eap->cookie))->finished = TRUE;
}


/*
 * Return TRUE when a sourced file had the ":finish" command: Don't give error
 * message for missing ":endif".
 * Return FALSE when not sourcing a file.
 */
    int
source_finished(
    char_u	*(*fgetline)(int, void *, int, getline_opt_T),
    void	*cookie)
{
    return (getline_equal(fgetline, cookie, getsourceline)
	    && ((source_cookie_T *)getline_cookie(
						fgetline, cookie))->finished);
}

/*
 * Return the autoload script name for a function or variable name.
 * Returns NULL when out of memory.
 * Caller must make sure that "name" contains AUTOLOAD_CHAR.
 */
    char_u *
autoload_name(char_u *name)
{
    char_u	*p, *q = NULL;
    char_u	*scriptname;

    // Get the script file name: replace '#' with '/', append ".vim".
    scriptname = alloc(STRLEN(name) + 14);
    if (scriptname == NULL)
	return NULL;
    STRCPY(scriptname, "autoload/");
    STRCAT(scriptname, name[0] == 'g' && name[1] == ':' ? name + 2: name);
    for (p = scriptname + 9; (p = vim_strchr(p, AUTOLOAD_CHAR)) != NULL;
								    q = p, ++p)
	*p = '/';
    STRCPY(q, ".vim");
    return scriptname;
}

/*
 * If "name" has a package name try autoloading the script for it.
 * Return TRUE if a package was loaded.
 */
    int
script_autoload(
    char_u	*name,
    int		reload)	    // load script again when already loaded
{
    char_u	*p;
    char_u	*scriptname, *tofree;
    int		ret = FALSE;
    int		i;
    int		ret_sid;

    // If there is no '#' after name[0] there is no package name.
    p = vim_strchr(name, AUTOLOAD_CHAR);
    if (p == NULL || p == name)
	return FALSE;

    tofree = scriptname = autoload_name(name);
    if (scriptname == NULL)
	return FALSE;

    // Find the name in the list of previously loaded package names.  Skip
    // "autoload/", it's always the same.
    for (i = 0; i < ga_loaded.ga_len; ++i)
	if (STRCMP(((char_u **)ga_loaded.ga_data)[i] + 9, scriptname + 9) == 0)
	    break;
    if (!reload && i < ga_loaded.ga_len)
	ret = FALSE;	    // was loaded already
    else
    {
	// Remember the name if it wasn't loaded already.
	if (i == ga_loaded.ga_len && ga_grow(&ga_loaded, 1) == OK)
	{
	    ((char_u **)ga_loaded.ga_data)[ga_loaded.ga_len++] = scriptname;
	    tofree = NULL;
	}

	// Try loading the package from $VIMRUNTIME/autoload/<name>.vim
	// Use "ret_sid" to avoid loading the same script again.
	if (source_in_path(p_rtp, scriptname, 0, &ret_sid) == OK)
	    ret = TRUE;
    }

    vim_free(tofree);
    return ret;
}
#endif