patch 8.2.3297: cannot use all commands inside a {} block

Problem:    Cannot use all commands inside a {} block after :command and
            :autocmd.
Solution:   Do consider \n to separate commands. (closes #8620)

Author: brammool

runtime/doc/map.txt

@@ -1580,8 +1580,11 @@ Example: >
 		echo 'hello'
 		g:calledMyCommand = true
 	    }
-No nesting is supported, inline functions cannot be used.  Using `:normal`
-directly does not work, you can use it indirectly with `:execute`.
+<							*E1231*
+There must be white space before the "{".  No nesting is supported, inline
+functions cannot be used.  Commands where a "|" may appear in the argument,
+such as commands with an expression argument, cannot be followed by a "|" and
+another command.
 
 The replacement text {repl} for a user defined command is scanned for special
 escape sequences, using <...> notation.  Escape sequences are replaced with

src/errors.h

@@ -643,4 +643,6 @@ EXTERN char e_list_dict_or_blob_required_for_argument_nr[]
 EXTERN char e_expected_dictionary_for_using_key_str_but_got_str[]
 	INIT(= N_("E1229: Expected dictionary for using key \"%s\", but got %s"));
 EXTERN char e_encryption_sodium_mlock_failed[]
-	INIT(= N_("E1230: encryption: sodium_mlock() failed"));
+	INIT(= N_("E1230: Encryption: sodium_mlock() failed"));
+EXTERN char e_cannot_use_bar_to_separate_commands_here_str[]
+	INIT(= N_("E1231: Cannot use a bar to separate commands here: %s"));

src/eval.c

@@ -2314,7 +2314,7 @@ eval0(
     }
 
     if (eap != NULL)
-	eap->nextcmd = check_nextcmd(p);
+	set_nextcmd(eap, p);
 
     return ret;
 }
@@ -6173,7 +6173,7 @@ ex_echo(exarg_T *eap)
 	clear_tv(&rettv);
 	arg = skipwhite(arg);
     }
-    eap->nextcmd = check_nextcmd(arg);
+    set_nextcmd(eap, arg);
     clear_evalarg(&evalarg, eap);
 
     if (eap->skip)
@@ -6317,7 +6317,7 @@ ex_execute(exarg_T *eap)
     if (eap->skip)
 	--emsg_skip;
 
-    eap->nextcmd = check_nextcmd(arg);
+    set_nextcmd(eap, arg);
 }
 
 /*

src/evalvars.c

@@ -812,7 +812,7 @@ ex_let(exarg_T *eap)
 	    list_func_vars(&first);
 	    list_vim_vars(&first);
 	}
-	eap->nextcmd = check_nextcmd(arg);
+	set_nextcmd(eap, arg);
     }
     else if (expr[0] == '=' && expr[1] == '<' && expr[2] == '<')
     {
@@ -1629,7 +1629,7 @@ ex_unletlock(
 	arg = skipwhite(name_end);
     } while (!ends_excmd2(name_end, arg));
 
-    eap->nextcmd = check_nextcmd(arg);
+    set_nextcmd(eap, arg);
 }
 
     static int

src/ex_cmds.c

@@ -450,7 +450,7 @@ ex_sort(exarg_T *eap)
 	    unique = TRUE;
 	else if (*p == '"')	// comment start
 	    break;
-	else if (check_nextcmd(p) != NULL)
+	else if (eap->nextcmd == NULL && check_nextcmd(p) != NULL)
 	{
 	    eap->nextcmd = check_nextcmd(p);
 	    break;
@@ -3930,7 +3930,7 @@ ex_substitute(exarg_T *eap)
     cmd = skipwhite(cmd);
     if (*cmd && *cmd != '"')	    // if not end-of-line or comment
     {
-	eap->nextcmd = check_nextcmd(cmd);
+	set_nextcmd(eap, cmd);
 	if (eap->nextcmd == NULL)
 	{
 	    semsg(_(e_trailing_arg), cmd);

src/ex_docmd.c

@@ -2314,22 +2314,24 @@ do_one_cmd(
 	ea.do_ecmd_cmd = getargcmd(&ea.arg);
 
     /*
-     * Check for '|' to separate commands and '"' or '#' to start comments.
-     * Don't do this for ":read !cmd" and ":write !cmd".
-     */
-    if ((ea.argt & EX_TRLBAR) && !ea.usefilter)
-	separate_nextcmd(&ea);
-
-    /*
-     * Check for <newline> to end a shell command.
+     * For commands that do not use '|' inside their argument: Check for '|' to
+     * separate commands and '"' or '#' to start comments.
+     *
+     * Otherwise: Check for <newline> to end a shell command.
      * Also do this for ":read !cmd", ":write !cmd" and ":global".
+     * Also do this inside a { - } block after :command and :autocmd.
      * Any others?
      */
+    if ((ea.argt & EX_TRLBAR) && !ea.usefilter)
+    {
+	separate_nextcmd(&ea);
+    }
     else if (ea.cmdidx == CMD_bang
 	    || ea.cmdidx == CMD_terminal
 	    || ea.cmdidx == CMD_global
 	    || ea.cmdidx == CMD_vglobal
-	    || ea.usefilter)
+	    || ea.usefilter
+	    || inside_block(&ea))
     {
 	for (p = ea.arg; *p; ++p)
 	{
@@ -5409,6 +5411,21 @@ check_nextcmd(char_u *p)
 	return NULL;
 }
 
+/*
+ * If "eap->nextcmd" is not set, check for a next command at "p".
+ */
+    void
+set_nextcmd(exarg_T *eap, char_u *arg)
+{
+    char_u *p = check_nextcmd(arg);
+
+    if (eap->nextcmd == NULL)
+	eap->nextcmd = p;
+    else if (p != NULL)
+	// cannot use "| command" inside a  {} block
+	semsg(_(e_cannot_use_bar_to_separate_commands_here_str), arg);
+}
+
 /*
  * - if there are more files to edit
  * - and this is the last window
@@ -7546,7 +7563,7 @@ ex_wincmd(exarg_T *eap)
     else
 	p = eap->arg + 1;
 
-    eap->nextcmd = check_nextcmd(p);
+    set_nextcmd(eap, p);
     p = skipwhite(p);
     if (*p != NUL && *p != (
 #ifdef FEAT_EVAL
@@ -8580,7 +8597,7 @@ ex_findpat(exarg_T *eap)
 	    if (!ends_excmd2(eap->arg, p))
 		eap->errmsg = ex_errmsg(e_trailing_arg, p);
 	    else
-		eap->nextcmd = check_nextcmd(p);
+		set_nextcmd(eap, p);
 	}
     }
     if (!eap->skip)

src/ex_eval.c

@@ -1461,6 +1461,18 @@ ex_endblock(exarg_T *eap)
 	leave_block(cstack);
 }
 
+    int
+inside_block(exarg_T *eap)
+{
+    cstack_T	*cstack = eap->cstack;
+    int		i;
+
+    for (i = 0; i <= cstack->cs_idx; ++i)
+	if (cstack->cs_flags[cstack->cs_idx] & CSF_BLOCK)
+	    return TRUE;
+    return FALSE;
+}
+
 /*
  * ":throw expr"
  */

src/proto/ex_docmd.pro

@@ -33,6 +33,7 @@ int ends_excmd(int c);
 int ends_excmd2(char_u *cmd_start, char_u *cmd);
 char_u *find_nextcmd(char_u *p);
 char_u *check_nextcmd(char_u *p);
+void set_nextcmd(exarg_T *eap, char_u *p);
 char_u *get_command_name(expand_T *xp, int idx);
 void not_exiting(void);
 int before_quit_autocmds(win_T *wp, int quit_all, int forceit);

src/proto/ex_eval.pro

@@ -22,6 +22,7 @@ void ex_break(exarg_T *eap);
 void ex_endwhile(exarg_T *eap);
 void ex_block(exarg_T *eap);
 void ex_endblock(exarg_T *eap);
+int inside_block(exarg_T *eap);
 void ex_throw(exarg_T *eap);
 void do_throw(cstack_T *cstack);
 void ex_try(exarg_T *eap);

src/syntax.c

@@ -3789,7 +3789,7 @@ syn_cmd_enable(exarg_T *eap, int syncing UNUSED)
     static void
 syn_cmd_reset(exarg_T *eap, int syncing UNUSED)
 {
-    eap->nextcmd = check_nextcmd(eap->arg);
+    set_nextcmd(eap, eap->arg);
     if (!eap->skip)
     {
 	set_internal_string_var((char_u *)"syntax_cmd", (char_u *)"reset");
@@ -3821,7 +3821,7 @@ syn_cmd_onoff(exarg_T *eap, char *name)
 {
     char_u	buf[100];
 
-    eap->nextcmd = check_nextcmd(eap->arg);
+    set_nextcmd(eap, eap->arg);
     if (!eap->skip)
     {
 	STRCPY(buf, "so ");
@@ -3928,7 +3928,7 @@ syn_cmd_list(
 	    arg = skipwhite(arg_end);
 	}
     }
-    eap->nextcmd = check_nextcmd(arg);
+    set_nextcmd(eap, arg);
 }
 
     static void
@@ -4921,7 +4921,7 @@ syn_cmd_keyword(exarg_T *eap, int syncing UNUSED)
     }
 
     if (rest != NULL)
-	eap->nextcmd = check_nextcmd(rest);
+	set_nextcmd(eap, rest);
     else
 	semsg(_(e_invarg2), arg);
 
@@ -4978,7 +4978,7 @@ syn_cmd_match(
 	/*
 	 * Check for trailing command and illegal trailing arguments.
 	 */
-	eap->nextcmd = check_nextcmd(rest);
+	set_nextcmd(eap, rest);
 	if (!ends_excmd2(eap->cmd, rest) || eap->skip)
 	    rest = NULL;
 	else if (ga_grow(&curwin->w_s->b_syn_patterns, 1) != FAIL
@@ -5218,7 +5218,7 @@ syn_cmd_region(
 	 * Check for trailing garbage or command.
 	 * If OK, add the item.
 	 */
-	eap->nextcmd = check_nextcmd(rest);
+	set_nextcmd(eap, rest);
 	if (!ends_excmd(*rest) || eap->skip)
 	    rest = NULL;
 	else if (ga_grow(&(curwin->w_s->b_syn_patterns), pat_count) != FAIL
@@ -5896,7 +5896,7 @@ syn_cmd_sync(exarg_T *eap, int syncing UNUSED)
 	semsg(_("E404: Illegal arguments: %s"), arg_start);
     else if (!finished)
     {
-	eap->nextcmd = check_nextcmd(arg_start);
+	set_nextcmd(eap, arg_start);
 	redraw_curbuf_later(SOME_VALID);
 	syn_stack_free_all(curwin->w_s);	// Need to recompute all syntax.
     }