patch 8.1.0825: code for autocommands is mixed with file I/O codev8.1.0825

Problem:    Code for autocommands is mixed with file I/O code.
Solution:   Move autocommand code to a separate file. (Yegappan Lakshmanan,
            closes #3863)

1 files changed, 2579 insertions, 0 deletions

diff --git a/src/autocmd.c b/src/autocmd.c
new file mode 100644
index 0000000000..55650b46f7
--- /dev/null
+++ b/src/autocmd.c
@@ -0,0 +1,2579 @@
+/* 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.
+ */
+
+/*
+ * autocmd.c: Autocommand related functions
+ */
+
+#include "vim.h"
+
+/*
+ * The autocommands are stored in a list for each event.
+ * Autocommands for the same pattern, that are consecutive, are joined
+ * together, to avoid having to match the pattern too often.
+ * The result is an array of Autopat lists, which point to AutoCmd lists:
+ *
+ * last_autopat[0]  -----------------------------+
+ *						 V
+ * first_autopat[0] --> Autopat.next  -->  Autopat.next -->  NULL
+ *			Autopat.cmds	   Autopat.cmds
+ *			    |			 |
+ *			    V			 V
+ *			AutoCmd.next	   AutoCmd.next
+ *			    |			 |
+ *			    V			 V
+ *			AutoCmd.next		NULL
+ *			    |
+ *			    V
+ *			   NULL
+ *
+ * last_autopat[1]  --------+
+ *			    V
+ * first_autopat[1] --> Autopat.next  -->  NULL
+ *			Autopat.cmds
+ *			    |
+ *			    V
+ *			AutoCmd.next
+ *			    |
+ *			    V
+ *			   NULL
+ *   etc.
+ *
+ *   The order of AutoCmds is important, this is the order in which they were
+ *   defined and will have to be executed.
+ */
+typedef struct AutoCmd
+{
+    char_u	    *cmd;		// The command to be executed (NULL
+					// when command has been removed).
+    char	    nested;		// If autocommands nest here.
+    char	    last;		// last command in list
+#ifdef FEAT_EVAL
+    sctx_T	    script_ctx;		// script context where defined
+#endif
+    struct AutoCmd  *next;		// next AutoCmd in list
+} AutoCmd;
+
+typedef struct AutoPat
+{
+    struct AutoPat  *next;		// Next AutoPat in AutoPat list; MUST
+					// be the first entry.
+    char_u	    *pat;		// pattern as typed (NULL when pattern
+					// has been removed)
+    regprog_T	    *reg_prog;		// compiled regprog for pattern
+    AutoCmd	    *cmds;		// list of commands to do
+    int		    group;		// group ID
+    int		    patlen;		// strlen() of pat
+    int		    buflocal_nr;	// !=0 for buffer-local AutoPat
+    char	    allow_dirs;		// Pattern may match whole path
+    char	    last;		// last pattern for apply_autocmds()
+} AutoPat;
+
+static struct event_name
+{
+    char	*name;	// event name
+    event_T	event;	// event number
+} event_names[] =
+{
+    {"BufAdd",		EVENT_BUFADD},
+    {"BufCreate",	EVENT_BUFADD},
+    {"BufDelete",	EVENT_BUFDELETE},
+    {"BufEnter",	EVENT_BUFENTER},
+    {"BufFilePost",	EVENT_BUFFILEPOST},
+    {"BufFilePre",	EVENT_BUFFILEPRE},
+    {"BufHidden",	EVENT_BUFHIDDEN},
+    {"BufLeave",	EVENT_BUFLEAVE},
+    {"BufNew",		EVENT_BUFNEW},
+    {"BufNewFile",	EVENT_BUFNEWFILE},
+    {"BufRead",		EVENT_BUFREADPOST},
+    {"BufReadCmd",	EVENT_BUFREADCMD},
+    {"BufReadPost",	EVENT_BUFREADPOST},
+    {"BufReadPre",	EVENT_BUFREADPRE},
+    {"BufUnload",	EVENT_BUFUNLOAD},
+    {"BufWinEnter",	EVENT_BUFWINENTER},
+    {"BufWinLeave",	EVENT_BUFWINLEAVE},
+    {"BufWipeout",	EVENT_BUFWIPEOUT},
+    {"BufWrite",	EVENT_BUFWRITEPRE},
+    {"BufWritePost",	EVENT_BUFWRITEPOST},
+    {"BufWritePre",	EVENT_BUFWRITEPRE},
+    {"BufWriteCmd",	EVENT_BUFWRITECMD},
+    {"CmdlineChanged",	EVENT_CMDLINECHANGED},
+    {"CmdlineEnter",	EVENT_CMDLINEENTER},
+    {"CmdlineLeave",	EVENT_CMDLINELEAVE},
+    {"CmdwinEnter",	EVENT_CMDWINENTER},
+    {"CmdwinLeave",	EVENT_CMDWINLEAVE},
+    {"CmdUndefined",	EVENT_CMDUNDEFINED},
+    {"ColorScheme",	EVENT_COLORSCHEME},
+    {"ColorSchemePre",	EVENT_COLORSCHEMEPRE},
+    {"CompleteDone",	EVENT_COMPLETEDONE},
+    {"CursorHold",	EVENT_CURSORHOLD},
+    {"CursorHoldI",	EVENT_CURSORHOLDI},
+    {"CursorMoved",	EVENT_CURSORMOVED},
+    {"CursorMovedI",	EVENT_CURSORMOVEDI},
+    {"DiffUpdated",	EVENT_DIFFUPDATED},
+    {"DirChanged",	EVENT_DIRCHANGED},
+    {"EncodingChanged",	EVENT_ENCODINGCHANGED},
+    {"ExitPre",		EVENT_EXITPRE},
+    {"FileEncoding",	EVENT_ENCODINGCHANGED},
+    {"FileAppendPost",	EVENT_FILEAPPENDPOST},
+    {"FileAppendPre",	EVENT_FILEAPPENDPRE},
+    {"FileAppendCmd",	EVENT_FILEAPPENDCMD},
+    {"FileChangedShell",EVENT_FILECHANGEDSHELL},
+    {"FileChangedShellPost",EVENT_FILECHANGEDSHELLPOST},
+    {"FileChangedRO",	EVENT_FILECHANGEDRO},
+    {"FileReadPost",	EVENT_FILEREADPOST},
+    {"FileReadPre",	EVENT_FILEREADPRE},
+    {"FileReadCmd",	EVENT_FILEREADCMD},
+    {"FileType",	EVENT_FILETYPE},
+    {"FileWritePost",	EVENT_FILEWRITEPOST},
+    {"FileWritePre",	EVENT_FILEWRITEPRE},
+    {"FileWriteCmd",	EVENT_FILEWRITECMD},
+    {"FilterReadPost",	EVENT_FILTERREADPOST},
+    {"FilterReadPre",	EVENT_FILTERREADPRE},
+    {"FilterWritePost",	EVENT_FILTERWRITEPOST},
+    {"FilterWritePre",	EVENT_FILTERWRITEPRE},
+    {"FocusGained",	EVENT_FOCUSGAINED},
+    {"FocusLost",	EVENT_FOCUSLOST},
+    {"FuncUndefined",	EVENT_FUNCUNDEFINED},
+    {"GUIEnter",	EVENT_GUIENTER},
+    {"GUIFailed",	EVENT_GUIFAILED},
+    {"InsertChange",	EVENT_INSERTCHANGE},
+    {"InsertEnter",	EVENT_INSERTENTER},
+    {"InsertLeave",	EVENT_INSERTLEAVE},
+    {"InsertCharPre",	EVENT_INSERTCHARPRE},
+    {"MenuPopup",	EVENT_MENUPOPUP},
+    {"OptionSet",	EVENT_OPTIONSET},
+    {"QuickFixCmdPost",	EVENT_QUICKFIXCMDPOST},
+    {"QuickFixCmdPre",	EVENT_QUICKFIXCMDPRE},
+    {"QuitPre",		EVENT_QUITPRE},
+    {"RemoteReply",	EVENT_REMOTEREPLY},
+    {"SessionLoadPost",	EVENT_SESSIONLOADPOST},
+    {"ShellCmdPost",	EVENT_SHELLCMDPOST},
+    {"ShellFilterPost",	EVENT_SHELLFILTERPOST},
+    {"SourceCmd",	EVENT_SOURCECMD},
+    {"SourcePre",	EVENT_SOURCEPRE},
+    {"SourcePost",	EVENT_SOURCEPOST},
+    {"SpellFileMissing",EVENT_SPELLFILEMISSING},
+    {"StdinReadPost",	EVENT_STDINREADPOST},
+    {"StdinReadPre",	EVENT_STDINREADPRE},
+    {"SwapExists",	EVENT_SWAPEXISTS},
+    {"Syntax",		EVENT_SYNTAX},
+    {"TabNew",		EVENT_TABNEW},
+    {"TabClosed",	EVENT_TABCLOSED},
+    {"TabEnter",	EVENT_TABENTER},
+    {"TabLeave",	EVENT_TABLEAVE},
+    {"TermChanged",	EVENT_TERMCHANGED},
+    {"TerminalOpen",	EVENT_TERMINALOPEN},
+    {"TermResponse",	EVENT_TERMRESPONSE},
+    {"TextChanged",	EVENT_TEXTCHANGED},
+    {"TextChangedI",	EVENT_TEXTCHANGEDI},
+    {"TextChangedP",	EVENT_TEXTCHANGEDP},
+    {"User",		EVENT_USER},
+    {"VimEnter",	EVENT_VIMENTER},
+    {"VimLeave",	EVENT_VIMLEAVE},
+    {"VimLeavePre",	EVENT_VIMLEAVEPRE},
+    {"WinNew",		EVENT_WINNEW},
+    {"WinEnter",	EVENT_WINENTER},
+    {"WinLeave",	EVENT_WINLEAVE},
+    {"VimResized",	EVENT_VIMRESIZED},
+    {"TextYankPost",	EVENT_TEXTYANKPOST},
+    {NULL,		(event_T)0}
+};
+
+static AutoPat *first_autopat[NUM_EVENTS] =
+{
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+
+static AutoPat *last_autopat[NUM_EVENTS] =
+{
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+
+#define AUGROUP_DEFAULT    -1	    // default autocmd group
+#define AUGROUP_ERROR	   -2	    // erroneous autocmd group
+#define AUGROUP_ALL	   -3	    // all autocmd groups
+
+/*
+ * struct used to keep status while executing autocommands for an event.
+ */
+typedef struct AutoPatCmd
+{
+    AutoPat	*curpat;	// next AutoPat to examine
+    AutoCmd	*nextcmd;	// next AutoCmd to execute
+    int		group;		// group being used
+    char_u	*fname;		// fname to match with
+    char_u	*sfname;	// sfname to match with
+    char_u	*tail;		// tail of fname
+    event_T	event;		// current event
+    int		arg_bufnr;	// Initially equal to <abuf>, set to zero when
+				// buf is deleted.
+    struct AutoPatCmd   *next;	// chain of active apc-s for auto-invalidation
+} AutoPatCmd;
+
+static AutoPatCmd *active_apc_list = NULL; /* stack of active autocommands */
+
+/*
+ * augroups stores a list of autocmd group names.
+ */
+static garray_T augroups = {0, 0, sizeof(char_u *), 10, NULL};
+#define AUGROUP_NAME(i) (((char_u **)augroups.ga_data)[i])
+/* use get_deleted_augroup() to get this */
+static char_u *deleted_augroup = NULL;
+
+/*
+ * Set by the apply_autocmds_group function if the given event is equal to
+ * EVENT_FILETYPE. Used by the readfile function in order to determine if
+ * EVENT_BUFREADPOST triggered the EVENT_FILETYPE.
+ *
+ * Relying on this value requires one to reset it prior calling
+ * apply_autocmds_group.
+ */
+int au_did_filetype INIT(= FALSE);
+
+/*
+ * The ID of the current group.  Group 0 is the default one.
+ */
+static int current_augroup = AUGROUP_DEFAULT;
+
+static int au_need_clean = FALSE;   /* need to delete marked patterns */
+
+static char_u *event_nr2name(event_T event);
+static int au_get_grouparg(char_u **argp);
+static int do_autocmd_event(event_T event, char_u *pat, int nested, char_u *cmd, int forceit, int group);
+static int apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io, int force, int group, buf_T *buf, exarg_T *eap);
+static void auto_next_pat(AutoPatCmd *apc, int stop_at_last);
+static int au_find_group(char_u *name);
+
+static event_T	last_event;
+static int	last_group;
+static int	autocmd_blocked = 0;	/* block all autocmds */
+
+    static char_u *
+get_deleted_augroup(void)
+{
+    if (deleted_augroup == NULL)
+	deleted_augroup = (char_u *)_("--Deleted--");
+    return deleted_augroup;
+}
+
+/*
+ * Show the autocommands for one AutoPat.
+ */
+    static void
+show_autocmd(AutoPat *ap, event_T event)
+{
+    AutoCmd *ac;
+
+    // Check for "got_int" (here and at various places below), which is set
+    // when "q" has been hit for the "--more--" prompt
+    if (got_int)
+	return;
+    if (ap->pat == NULL)		// pattern has been removed
+	return;
+
+    msg_putchar('\n');
+    if (got_int)
+	return;
+    if (event != last_event || ap->group != last_group)
+    {
+	if (ap->group != AUGROUP_DEFAULT)
+	{
+	    if (AUGROUP_NAME(ap->group) == NULL)
+		msg_puts_attr((char *)get_deleted_augroup(), HL_ATTR(HLF_E));
+	    else
+		msg_puts_attr((char *)AUGROUP_NAME(ap->group), HL_ATTR(HLF_T));
+	    msg_puts("  ");
+	}
+	msg_puts_attr((char *)event_nr2name(event), HL_ATTR(HLF_T));
+	last_event = event;
+	last_group = ap->group;
+	msg_putchar('\n');
+	if (got_int)
+	    return;
+    }
+    msg_col = 4;
+    msg_outtrans(ap->pat);
+
+    for (ac = ap->cmds; ac != NULL; ac = ac->next)
+    {
+	if (ac->cmd != NULL)		// skip removed commands
+	{
+	    if (msg_col >= 14)
+		msg_putchar('\n');
+	    msg_col = 14;
+	    if (got_int)
+		return;
+	    msg_outtrans(ac->cmd);
+#ifdef FEAT_EVAL
+	    if (p_verbose > 0)
+		last_set_msg(ac->script_ctx);
+#endif
+	    if (got_int)
+		return;
+	    if (ac->next != NULL)
+	    {
+		msg_putchar('\n');
+		if (got_int)
+		    return;
+	    }
+	}
+    }
+}
+
+/*
+ * Mark an autocommand pattern for deletion.
+ */
+    static void
+au_remove_pat(AutoPat *ap)
+{
+    VIM_CLEAR(ap->pat);
+    ap->buflocal_nr = -1;
+    au_need_clean = TRUE;
+}
+
+/*
+ * Mark all commands for a pattern for deletion.
+ */
+    static void
+au_remove_cmds(AutoPat *ap)
+{
+    AutoCmd *ac;
+
+    for (ac = ap->cmds; ac != NULL; ac = ac->next)
+	VIM_CLEAR(ac->cmd);
+    au_need_clean = TRUE;
+}
+
+/*
+ * Cleanup autocommands and patterns that have been deleted.
+ * This is only done when not executing autocommands.
+ */
+    static void
+au_cleanup(void)
+{
+    AutoPat	*ap, **prev_ap;
+    AutoCmd	*ac, **prev_ac;
+    event_T	event;
+
+    if (autocmd_busy || !au_need_clean)
+	return;
+
+    // loop over all events
+    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+					    event = (event_T)((int)event + 1))
+    {
+	// loop over all autocommand patterns
+	prev_ap = &(first_autopat[(int)event]);
+	for (ap = *prev_ap; ap != NULL; ap = *prev_ap)
+	{
+	    // loop over all commands for this pattern
+	    prev_ac = &(ap->cmds);
+	    for (ac = *prev_ac; ac != NULL; ac = *prev_ac)
+	    {
+		// remove the command if the pattern is to be deleted or when
+		// the command has been marked for deletion
+		if (ap->pat == NULL || ac->cmd == NULL)
+		{
+		    *prev_ac = ac->next;
+		    vim_free(ac->cmd);
+		    vim_free(ac);
+		}
+		else
+		    prev_ac = &(ac->next);
+	    }
+
+	    // remove the pattern if it has been marked for deletion
+	    if (ap->pat == NULL)
+	    {
+		if (ap->next == NULL)
+		{
+		    if (prev_ap == &(first_autopat[(int)event]))
+			last_autopat[(int)event] = NULL;
+		    else
+			// this depends on the "next" field being the first in
+			// the struct
+			last_autopat[(int)event] = (AutoPat *)prev_ap;
+		}
+		*prev_ap = ap->next;
+		vim_regfree(ap->reg_prog);
+		vim_free(ap);
+	    }
+	    else
+		prev_ap = &(ap->next);
+	}
+    }
+
+    au_need_clean = FALSE;
+}
+
+/*
+ * Called when buffer is freed, to remove/invalidate related buffer-local
+ * autocmds.
+ */
+    void
+aubuflocal_remove(buf_T *buf)
+{
+    AutoPat	*ap;
+    event_T	event;
+    AutoPatCmd	*apc;
+
+    // invalidate currently executing autocommands
+    for (apc = active_apc_list; apc; apc = apc->next)
+	if (buf->b_fnum == apc->arg_bufnr)
+	    apc->arg_bufnr = 0;
+
+    // invalidate buflocals looping through events
+    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+					    event = (event_T)((int)event + 1))
+	// loop over all autocommand patterns
+	for (ap = first_autopat[(int)event]; ap != NULL; ap = ap->next)
+	    if (ap->buflocal_nr == buf->b_fnum)
+	    {
+		au_remove_pat(ap);
+		if (p_verbose >= 6)
+		{
+		    verbose_enter();
+		    smsg(_("auto-removing autocommand: %s <buffer=%d>"),
+					   event_nr2name(event), buf->b_fnum);
+		    verbose_leave();
+		}
+	    }
+    au_cleanup();
+}
+
+/*
+ * Add an autocmd group name.
+ * Return its ID.  Returns AUGROUP_ERROR (< 0) for error.
+ */
+    static int
+au_new_group(char_u *name)
+{
+    int		i;
+
+    i = au_find_group(name);
+    if (i == AUGROUP_ERROR)	// the group doesn't exist yet, add it
+    {
+	// First try using a free entry.
+	for (i = 0; i < augroups.ga_len; ++i)
+	    if (AUGROUP_NAME(i) == NULL)
+		break;
+	if (i == augroups.ga_len && ga_grow(&augroups, 1) == FAIL)
+	    return AUGROUP_ERROR;
+
+	AUGROUP_NAME(i) = vim_strsave(name);
+	if (AUGROUP_NAME(i) == NULL)
+	    return AUGROUP_ERROR;
+	if (i == augroups.ga_len)
+	    ++augroups.ga_len;
+    }
+
+    return i;
+}
+
+    static void
+au_del_group(char_u *name)
+{
+    int	    i;
+
+    i = au_find_group(name);
+    if (i == AUGROUP_ERROR)	// the group doesn't exist
+	semsg(_("E367: No such group: \"%s\""), name);
+    else if (i == current_augroup)
+	emsg(_("E936: Cannot delete the current group"));
+    else
+    {
+	event_T	event;
+	AutoPat	*ap;
+	int	in_use = FALSE;
+
+	for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+					    event = (event_T)((int)event + 1))
+	{
+	    for (ap = first_autopat[(int)event]; ap != NULL; ap = ap->next)
+		if (ap->group == i && ap->pat != NULL)
+		{
+		    give_warning((char_u *)_("W19: Deleting augroup that is still in use"), TRUE);
+		    in_use = TRUE;
+		    event = NUM_EVENTS;
+		    break;
+		}
+	}
+	vim_free(AUGROUP_NAME(i));
+	if (in_use)
+	{
+	    AUGROUP_NAME(i) = get_deleted_augroup();
+	}
+	else
+	    AUGROUP_NAME(i) = NULL;
+    }
+}
+
+/*
+ * Find the ID of an autocmd group name.
+ * Return its ID.  Returns AUGROUP_ERROR (< 0) for error.
+ */
+    static int
+au_find_group(char_u *name)
+{
+    int	    i;
+
+    for (i = 0; i < augroups.ga_len; ++i)
+	if (AUGROUP_NAME(i) != NULL && AUGROUP_NAME(i) != get_deleted_augroup()
+		&& STRCMP(AUGROUP_NAME(i), name) == 0)
+	    return i;
+    return AUGROUP_ERROR;
+}
+
+/*
+ * Return TRUE if augroup "name" exists.
+ */
+    int
+au_has_group(char_u *name)
+{
+    return au_find_group(name) != AUGROUP_ERROR;
+}
+
+/*
+ * ":augroup {name}".
+ */
+    void
+do_augroup(char_u *arg, int del_group)
+{
+    int	    i;
+
+    if (del_group)
+    {
+	if (*arg == NUL)
+	    emsg(_(e_argreq));
+	else
+	    au_del_group(arg);
+    }
+    else if (STRICMP(arg, "end") == 0)   // ":aug end": back to group 0
+	current_augroup = AUGROUP_DEFAULT;
+    else if (*arg)		    // ":aug xxx": switch to group xxx
+    {
+	i = au_new_group(arg);
+	if (i != AUGROUP_ERROR)
+	    current_augroup = i;
+    }
+    else			    // ":aug": list the group names
+    {
+	msg_start();
+	for (i = 0; i < augroups.ga_len; ++i)
+	{
+	    if (AUGROUP_NAME(i) != NULL)
+	    {
+		msg_puts((char *)AUGROUP_NAME(i));
+		msg_puts("  ");
+	    }
+	}
+	msg_clr_eos();
+	msg_end();
+    }
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+    void
+free_all_autocmds(void)
+{
+    int		i;
+    char_u	*s;
+
+    for (current_augroup = -1; current_augroup < augroups.ga_len;
+							    ++current_augroup)
+	do_autocmd((char_u *)"", TRUE);
+
+    for (i = 0; i < augroups.ga_len; ++i)
+    {
+	s = ((char_u **)(augroups.ga_data))[i];
+	if (s != get_deleted_augroup())
+	    vim_free(s);
+    }
+    ga_clear(&augroups);
+}
+#endif
+
+/*
+ * Return the event number for event name "start".
+ * Return NUM_EVENTS if the event name was not found.
+ * Return a pointer to the next event name in "end".
+ */
+    static event_T
+event_name2nr(char_u *start, char_u **end)
+{
+    char_u	*p;
+    int		i;
+    int		len;
+
+    // the event name ends with end of line, '|', a blank or a comma
+    for (p = start; *p && !VIM_ISWHITE(*p) && *p != ',' && *p != '|'; ++p)
+	;
+    for (i = 0; event_names[i].name != NULL; ++i)
+    {
+	len = (int)STRLEN(event_names[i].name);
+	if (len == p - start && STRNICMP(event_names[i].name, start, len) == 0)
+	    break;
+    }
+    if (*p == ',')
+	++p;
+    *end = p;
+    if (event_names[i].name == NULL)
+	return NUM_EVENTS;
+    return event_names[i].event;
+}
+
+/*
+ * Return the name for event "event".
+ */
+    static char_u *
+event_nr2name(event_T event)
+{
+    int	    i;
+
+    for (i = 0; event_names[i].name != NULL; ++i)
+	if (event_names[i].event == event)
+	    return (char_u *)event_names[i].name;
+    return (char_u *)"Unknown";
+}
+
+/*
+ * Scan over the events.  "*" stands for all events.
+ */
+    static char_u *
+find_end_event(
+    char_u  *arg,
+    int	    have_group)	    // TRUE when group name was found
+{
+    char_u  *pat;
+    char_u  *p;
+
+    if (*arg == '*')
+    {
+	if (arg[1] && !VIM_ISWHITE(arg[1]))
+	{
+	    semsg(_("E215: Illegal character after *: %s"), arg);
+	    return NULL;
+	}
+	pat = arg + 1;
+    }
+    else
+    {
+	for (pat = arg; *pat && *pat != '|' && !VIM_ISWHITE(*pat); pat = p)
+	{
+	    if ((int)event_name2nr(pat, &p) >= (int)NUM_EVENTS)
+	    {
+		if (have_group)
+		    semsg(_("E216: No such event: %s"), pat);
+		else
+		    semsg(_("E216: No such group or event: %s"), pat);
+		return NULL;
+	    }
+	}
+    }
+    return pat;
+}
+
+/*
+ * Return TRUE if "event" is included in 'eventignore'.
+ */
+    static int
+event_ignored(event_T event)
+{
+    char_u	*p = p_ei;
+
+    while (*p != NUL)
+    {
+	if (STRNICMP(p, "all", 3) == 0 && (p[3] == NUL || p[3] == ','))
+	    return TRUE;
+	if (event_name2nr(p, &p) == event)
+	    return TRUE;
+    }
+
+    return FALSE;
+}
+
+/*
+ * Return OK when the contents of p_ei is valid, FAIL otherwise.
+ */
+    int
+check_ei(void)
+{
+    char_u	*p = p_ei;
+
+    while (*p)
+    {
+	if (STRNICMP(p, "all", 3) == 0 && (p[3] == NUL || p[3] == ','))
+	{
+	    p += 3;
+	    if (*p == ',')
+		++p;
+	}
+	else if (event_name2nr(p, &p) == NUM_EVENTS)
+	    return FAIL;
+    }
+
+    return OK;
+}
+
+# if defined(FEAT_SYN_HL) || defined(PROTO)
+
+/*
+ * Add "what" to 'eventignore' to skip loading syntax highlighting for every
+ * buffer loaded into the window.  "what" must start with a comma.
+ * Returns the old value of 'eventignore' in allocated memory.
+ */
+    char_u *
+au_event_disable(char *what)
+{
+    char_u	*new_ei;
+    char_u	*save_ei;
+
+    save_ei = vim_strsave(p_ei);
+    if (save_ei != NULL)
+    {
+	new_ei = vim_strnsave(p_ei, (int)(STRLEN(p_ei) + STRLEN(what)));
+	if (new_ei != NULL)
+	{
+	    if (*what == ',' && *p_ei == NUL)
+		STRCPY(new_ei, what + 1);
+	    else
+		STRCAT(new_ei, what);
+	    set_string_option_direct((char_u *)"ei", -1, new_ei,
+							  OPT_FREE, SID_NONE);
+	    vim_free(new_ei);
+	}
+    }
+    return save_ei;
+}
+
+    void
+au_event_restore(char_u *old_ei)
+{
+    if (old_ei != NULL)
+    {
+	set_string_option_direct((char_u *)"ei", -1, old_ei,
+							  OPT_FREE, SID_NONE);
+	vim_free(old_ei);
+    }
+}
+# endif  /* FEAT_SYN_HL */
+
+/*
+ * do_autocmd() -- implements the :autocmd command.  Can be used in the
+ *  following ways:
+ *
+ * :autocmd <event> <pat> <cmd>	    Add <cmd> to the list of commands that
+ *				    will be automatically executed for <event>
+ *				    when editing a file matching <pat>, in
+ *				    the current group.
+ * :autocmd <event> <pat>	    Show the autocommands associated with
+ *				    <event> and <pat>.
+ * :autocmd <event>		    Show the autocommands associated with
+ *				    <event>.
+ * :autocmd			    Show all autocommands.
+ * :autocmd! <event> <pat> <cmd>    Remove all autocommands associated with
+ *				    <event> and <pat>, and add the command
+ *				    <cmd>, for the current group.
+ * :autocmd! <event> <pat>	    Remove all autocommands associated with
+ *				    <event> and <pat> for the current group.
+ * :autocmd! <event>		    Remove all autocommands associated with
+ *				    <event> for the current group.
+ * :autocmd!			    Remove ALL autocommands for the current
+ *				    group.
+ *
+ *  Multiple events and patterns may be given separated by commas.  Here are
+ *  some examples:
+ * :autocmd bufread,bufenter *.c,*.h	set tw=0 smartindent noic
+ * :autocmd bufleave	     *		set tw=79 nosmartindent ic infercase
+ *
+ * :autocmd * *.c		show all autocommands for *.c files.
+ *
+ * Mostly a {group} argument can optionally appear before <event>.
+ */
+    void
+do_autocmd(char_u *arg_in, int forceit)
+{
+    char_u	*arg = arg_in;
+    char_u	*pat;
+    char_u	*envpat = NULL;
+    char_u	*cmd;
+    event_T	event;
+    int		need_free = FALSE;
+    int		nested = FALSE;
+    int		group;
+
+    if (*arg == '|')
+    {
+	arg = (char_u *)"";
+	group = AUGROUP_ALL;	// no argument, use all groups
+    }
+    else
+    {
+	/*
+	 * Check for a legal group name.  If not, use AUGROUP_ALL.
+	 */
+	group = au_get_grouparg(&arg);
+	if (arg == NULL)	    // out of memory
+	    return;
+    }
+
+    /*
+     * Scan over the events.
+     * If we find an illegal name, return here, don't do anything.
+     */
+    pat = find_end_event(arg, group != AUGROUP_ALL);
+    if (pat == NULL)
+	return;
+
+    pat = skipwhite(pat);
+    if (*pat == '|')
+    {
+	pat = (char_u *)"";
+	cmd = (char_u *)"";
+    }
+    else
+    {
+	/*
+	 * Scan over the pattern.  Put a NUL at the end.
+	 */
+	cmd = pat;
+	while (*cmd && (!VIM_ISWHITE(*cmd) || cmd[-1] == '\\'))
+	    cmd++;
+	if (*cmd)
+	    *cmd++ = NUL;
+
+	// Expand environment variables in the pattern.  Set 'shellslash', we
+	// want forward slashes here.
+	if (vim_strchr(pat, '$') != NULL || vim_strchr(pat, '~') != NULL)
+	{
+#ifdef BACKSLASH_IN_FILENAME
+	    int	p_ssl_save = p_ssl;
+
+	    p_ssl = TRUE;
+#endif
+	    envpat = expand_env_save(pat);
+#ifdef BACKSLASH_IN_FILENAME
+	    p_ssl = p_ssl_save;
+#endif
+	    if (envpat != NULL)
+		pat = envpat;
+	}
+
+	/*
+	 * Check for "nested" flag.
+	 */
+	cmd = skipwhite(cmd);
+	if (*cmd != NUL && STRNCMP(cmd, "nested", 6) == 0
+							&& VIM_ISWHITE(cmd[6]))
+	{
+	    nested = TRUE;
+	    cmd = skipwhite(cmd + 6);
+	}
+
+	/*
+	 * Find the start of the commands.
+	 * Expand <sfile> in it.
+	 */
+	if (*cmd != NUL)
+	{
+	    cmd = expand_sfile(cmd);
+	    if (cmd == NULL)	    // some error
+		return;
+	    need_free = TRUE;
+	}
+    }
+
+    /*
+     * Print header when showing autocommands.
+     */
+    if (!forceit && *cmd == NUL)
+	// Highlight title
+	msg_puts_title(_("\n--- Autocommands ---"));
+
+    /*
+     * Loop over the events.
+     */
+    last_event = (event_T)-1;		// for listing the event name
+    last_group = AUGROUP_ERROR;		// for listing the group name
+    if (*arg == '*' || *arg == NUL || *arg == '|')
+    {
+	for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+					    event = (event_T)((int)event + 1))
+	    if (do_autocmd_event(event, pat,
+					 nested, cmd, forceit, group) == FAIL)
+		break;
+    }
+    else
+    {
+	while (*arg && *arg != '|' && !VIM_ISWHITE(*arg))
+	    if (do_autocmd_event(event_name2nr(arg, &arg), pat,
+					nested,	cmd, forceit, group) == FAIL)
+		break;
+    }
+
+    if (need_free)
+	vim_free(cmd);
+    vim_free(envpat);
+}
+
+/*
+ * Find the group ID in a ":autocmd" or ":doautocmd" argument.
+ * The "argp" argument is advanced to the following argument.
+ *
+ * Returns the group ID, AUGROUP_ERROR for error (out of memory).
+ */
+    static int
+au_get_grouparg(char_u **argp)
+{
+    char_u	*group_name;
+    char_u	*p;
+    char_u	*arg = *argp;
+    int		group = AUGROUP_ALL;
+
+    for (p = arg; *p && !VIM_ISWHITE(*p) && *p != '|'; ++p)
+	;
+    if (p > arg)
+    {
+	group_name = vim_strnsave(arg, (int)(p - arg));
+	if (group_name == NULL)		// out of memory
+	    return AUGROUP_ERROR;
+	group = au_find_group(group_name);
+	if (group == AUGROUP_ERROR)
+	    group = AUGROUP_ALL;	// no match, use all groups
+	else
+	    *argp = skipwhite(p);	// match, skip over group name
+	vim_free(group_name);
+    }
+    return group;
+}
+
+/*
+ * do_autocmd() for one event.
+ * If *pat == NUL do for all patterns.
+ * If *cmd == NUL show entries.
+ * If forceit == TRUE delete entries.
+ * If group is not AUGROUP_ALL, only use this group.
+ */
+    static int
+do_autocmd_event(
+    event_T	event,
+    char_u	*pat,
+    int		nested,
+    char_u	*cmd,
+    int		forceit,
+    int		group)
+{
+    AutoPat	*ap;
+    AutoPat	**prev_ap;
+    AutoCmd	*ac;
+    AutoCmd	**prev_ac;
+    int		brace_level;
+    char_u	*endpat;
+    int		findgroup;
+    int		allgroups;
+    int		patlen;
+    int		is_buflocal;
+    int		buflocal_nr;
+    char_u	buflocal_pat[25];	/* for "<buffer=X>" */
+
+    if (group == AUGROUP_ALL)
+	findgroup = current_augroup;
+    else
+	findgroup = group;
+    allgroups = (group == AUGROUP_ALL && !forceit && *cmd == NUL);
+
+    /*
+     * Show or delete all patterns for an event.
+     */
+    if (*pat == NUL)
+    {
+	for (ap = first_autopat[(int)event]; ap != NULL; ap = ap->next)
+	{
+	    if (forceit)  // delete the AutoPat, if it's in the current group
+	    {
+		if (ap->group == findgroup)
+		    au_remove_pat(ap);
+	    }
+	    else if (group == AUGROUP_ALL || ap->group == group)
+		show_autocmd(ap, event);
+	}
+    }
+
+    /*
+     * Loop through all the specified patterns.
+     */
+    for ( ; *pat; pat = (*endpat == ',' ? endpat + 1 : endpat))
+    {
+	/*
+	 * Find end of the pattern.
+	 * Watch out for a comma in braces, like "*.\{obj,o\}".
+	 */
+	brace_level = 0;
+	for (endpat = pat; *endpat && (*endpat != ',' || brace_level
+			   || (endpat > pat && endpat[-1] == '\\')); ++endpat)
+	{
+	    if (*endpat == '{')
+		brace_level++;
+	    else if (*endpat == '}')
+		brace_level--;
+	}
+	if (pat == endpat)		// ignore single comma
+	    continue;
+	patlen = (int)(endpat - pat);
+
+	/*
+	 * detect special <buflocal[=X]> buffer-local patterns
+	 */
+	is_buflocal = FALSE;
+	buflocal_nr = 0;
+
+	if (patlen >= 8 && STRNCMP(pat, "<buffer", 7) == 0
+						    && pat[patlen - 1] == '>')
+	{
+	    // "<buffer...>": Error will be printed only for addition.
+	    // printing and removing will proceed silently.
+	    is_buflocal = TRUE;
+	    if (patlen == 8)
+		// "<buffer>"
+		buflocal_nr = curbuf->b_fnum;
+	    else if (patlen > 9 && pat[7] == '=')
+	    {
+		if (patlen == 13 && STRNICMP(pat, "<buffer=abuf>", 13) == 0)
+		    // "<buffer=abuf>"
+		    buflocal_nr = autocmd_bufnr;
+		else if (skipdigits(pat + 8) == pat + patlen - 1)
+		    // "<buffer=123>"
+		    buflocal_nr = atoi((char *)pat + 8);
+	    }
+	}
+
+	if (is_buflocal)
+	{
+	    // normalize pat into standard "<buffer>#N" form
+	    sprintf((char *)buflocal_pat, "<buffer=%d>", buflocal_nr);
+	    pat = buflocal_pat;			// can modify pat and patlen
+	    patlen = (int)STRLEN(buflocal_pat);	//   but not endpat
+	}
+
+	/*
+	 * Find AutoPat entries with this pattern.  When adding a command it
+	 * always goes at or after the last one, so start at the end.
+	 */
+	if (!forceit && *cmd != NUL && last_autopat[(int)event] != NULL)
+	    prev_ap = &last_autopat[(int)event];
+	else
+	    prev_ap = &first_autopat[(int)event];
+	while ((ap = *prev_ap) != NULL)
+	{
+	    if (ap->pat != NULL)
+	    {
+		/* Accept a pattern when:
+		 * - a group was specified and it's that group, or a group was
+		 *   not specified and it's the current group, or a group was
+		 *   not specified and we are listing
+		 * - the length of the pattern matches
+		 * - the pattern matches.
+		 * For <buffer[=X]>, this condition works because we normalize
+		 * all buffer-local patterns.
+		 */
+		if ((allgroups || ap->group == findgroup)
+			&& ap->patlen == patlen
+			&& STRNCMP(pat, ap->pat, patlen) == 0)
+		{
+		    /*
+		     * Remove existing autocommands.
+		     * If adding any new autocmd's for this AutoPat, don't
+		     * delete the pattern from the autopat list, append to
+		     * this list.
+		     */
+		    if (forceit)
+		    {
+			if (*cmd != NUL && ap->next == NULL)
+			{
+			    au_remove_cmds(ap);
+			    break;
+			}
+			au_remove_pat(ap);
+		    }
+
+		    /*
+		     * Show autocmd's for this autopat, or buflocals <buffer=X>
+		     */
+		    else if (*cmd == NUL)
+			show_autocmd(ap, event);
+
+		    /*
+		     * Add autocmd to this autopat, if it's the last one.
+		     */
+		    else if (ap->next == NULL)
+			break;
+		}
+	    }
+	    prev_ap = &ap->next;
+	}
+
+	/*
+	 * Add a new command.
+	 */
+	if (*cmd != NUL)
+	{
+	    /*
+	     * If the pattern we want to add a command to does appear at the
+	     * end of the list (or not is not in the list at all), add the
+	     * pattern at the end of the list.
+	     */
+	    if (ap == NULL)
+	    {
+		/* refuse to add buffer-local ap if buffer number is invalid */
+		if (is_buflocal && (buflocal_nr == 0
+				      || buflist_findnr(buflocal_nr) == NULL))
+		{
+		    semsg(_("E680: <buffer=%d>: invalid buffer number "),
+								 buflocal_nr);
+		    return FAIL;
+		}
+
+		ap = (AutoPat *)alloc((unsigned)sizeof(AutoPat));
+		if (ap == NULL)
+		    return FAIL;
+		ap->pat = vim_strnsave(pat, patlen);
+		ap->patlen = patlen;
+		if (ap->pat == NULL)
+		{
+		    vim_free(ap);
+		    return FAIL;
+		}
+
+		if (is_buflocal)
+		{
+		    ap->buflocal_nr = buflocal_nr;
+		    ap->reg_prog = NULL;
+		}
+		else
+		{
+		    char_u	*reg_pat;
+
+		    ap->buflocal_nr = 0;
+		    reg_pat = file_pat_to_reg_pat(pat, endpat,
+							 &ap->allow_dirs, TRUE);
+		    if (reg_pat != NULL)
+			ap->reg_prog = vim_regcomp(reg_pat, RE_MAGIC);
+		    vim_free(reg_pat);
+		    if (reg_pat == NULL || ap->reg_prog == NULL)
+		    {
+			vim_free(ap->pat);
+			vim_free(ap);
+			return FAIL;
+		    }
+		}<