patch 9.1.0774: "shellcmdline" doesn't work with getcompletion()

Problem:  "shellcmdline" doesn't work with getcompletion().
Solution: Use set_context_for_wildcard_arg() (zeertzjq).

closes: #15834

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: zeertzjq

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 08
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 09
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4091,7 +4091,7 @@ getcompletion({pat}, {type} [, {filtered}])		*getcompletion()*
 		cscope		|:cscope| suboptions
 		custom,{func}	custom completion, defined via {func}
 		customlist,{func} custom completion, defined via {func}
-		diff_buffer     |:diffget| and |:diffput| completion
+		diff_buffer	|:diffget| and |:diffput| completion
 		dir		directory names
 		dir_in_path	directory names in |'cdpath'|
 		environment	environment variable names
@@ -4115,6 +4115,7 @@ getcompletion({pat}, {type} [, {filtered}])		*getcompletion()*
 		runtime		|:runtime| completion
 		scriptnames	sourced script names |:scriptnames|
 		shellcmd	Shell command
+		shellcmdline	Shell command line with filename arguments
 		sign		|:sign| suboptions
 		syntax		syntax file names |'syntax'|
 		syntime		|:syntime| suboptions

src/cmdexpand.c

@@ -1721,7 +1721,7 @@ set_context_for_wildcard_arg(
 	// characters that end the command and white space.
 	else if (c == '|' || c == '\n' || c == '"' || (VIM_ISWHITE(c)
 #ifdef SPACE_IN_FILENAME
-		    && (!(eap->argt & EX_NOSPC) || usefilter)
+		    && (!(eap != NULL && (eap->argt & EX_NOSPC)) || usefilter)
 #endif
 		    ))
 	{
@@ -1756,7 +1756,10 @@ set_context_for_wildcard_arg(
     xp->xp_context = EXPAND_FILES;
 
     // For a shell command more chars need to be escaped.
-    if (usefilter || eap->cmdidx == CMD_bang || eap->cmdidx == CMD_terminal || *complp == EXPAND_SHELLCMDLINE)
+    if (usefilter
+	    || (eap != NULL
+		&& (eap->cmdidx == CMD_bang || eap->cmdidx == CMD_terminal))
+	    || *complp == EXPAND_SHELLCMDLINE)
     {
 #ifndef BACKSLASH_IN_FILENAME
 	xp->xp_shell = TRUE;
@@ -4208,6 +4211,13 @@ f_getcompletion(typval_T *argvars, typval_T *rettv)
 	    set_context_in_runtime_cmd(&xpc, xpc.xp_pattern);
 	    xpc.xp_pattern_len = (int)STRLEN(xpc.xp_pattern);
 	}
+	if (xpc.xp_context == EXPAND_SHELLCMDLINE)
+	{
+	    int context = EXPAND_SHELLCMDLINE;
+	    set_context_for_wildcard_arg(NULL, xpc.xp_pattern, FALSE, &xpc,
+								     &context);
+	    xpc.xp_pattern_len = (int)STRLEN(xpc.xp_pattern);
+	}
     }
 
     if (cmdline_fuzzy_completion_supported(&xpc))

src/testdir/test_cmdline.vim

@@ -1084,6 +1084,8 @@ func Test_cmdline_complete_shellcmdline()
 
   call feedkeys(":MyCmd whoam\<C-A>\<C-B>\"\<CR>", 'tx')
   call assert_match('^".*\<whoami\>', @:)
+  let l = getcompletion('whoam', 'shellcmdline')
+  call assert_match('\<whoami\>', join(l, ' '))
 
   delcommand MyCmd
 endfunc
@@ -3649,9 +3651,13 @@ func Test_cmdline_complete_shellcmdline_argument()
 
   call feedkeys(":MyCmd vim test_cmdline.\<Tab>\<C-B>\"\<CR>", 'xt')
   call assert_equal('"MyCmd vim test_cmdline.vim', @:)
+  call assert_equal(['test_cmdline.vim'],
+        \ getcompletion('vim test_cmdline.', 'shellcmdline'))
 
   call feedkeys(":MyCmd vim nonexistentfile\<Tab>\<C-B>\"\<CR>", 'xt')
   call assert_equal('"MyCmd vim nonexistentfile', @:)
+  call assert_equal([],
+        \ getcompletion('vim nonexistentfile', 'shellcmdline'))
 
   let compl1 = getcompletion('', 'file')[0]
   let compl2 = getcompletion('', 'file')[1]
@@ -3668,9 +3674,13 @@ func Test_cmdline_complete_shellcmdline_argument()
   set wildoptions&
   call feedkeys(":MyCmd vim test_cmdline.\<Tab>\<C-B>\"\<CR>", 'xt')
   call assert_equal('"MyCmd vim test_cmdline.vim', @:)
+  call assert_equal(['test_cmdline.vim'],
+        \ getcompletion('vim test_cmdline.', 'shellcmdline'))
 
   call feedkeys(":MyCmd vim nonexistentfile\<Tab>\<C-B>\"\<CR>", 'xt')
   call assert_equal('"MyCmd vim nonexistentfile', @:)
+  call assert_equal([],
+        \ getcompletion('vim nonexistentfile', 'shellcmdline'))
 
   let compl1 = getcompletion('', 'file')[0]
   let compl2 = getcompletion('', 'file')[1]

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    774,
 /**/
     773,
 /**/