patch 9.1.0821: 'findexpr' completion doesn't set v:fname to cmdline argumentv9.1.0821

Problem:  'findexpr' completion doesn't set v:fname to cmdline argument.
Solution: Set v:fname to the cmdline argument as-is (zeertzjq).

closes: #15934

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

10 files changed, 75 insertions, 38 deletions

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 80ccce8f69..027cf08c5b 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 9.1.  Last change: 2024 Oct 22
+*eval.txt*	For Vim version 9.1.  Last change: 2024 Oct 28
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2026,6 +2026,11 @@ v:cmdbang	Set like v:cmdarg for a file read/write command.  When a "!"
 		was used the value is 1, otherwise it is 0.  Note that this
 		can only be used in autocommands.  For user commands |<bang>|
 		can be used.
+
+					*v:cmdcomplete* *cmdcomplete-variable*
+v:cmdcomplete	When evaluating 'findexpr': if 'findexpr' is used for cmdline
+		completion the value is |v:true|, otherwise it is |v:false|.
+
 						*v:collate* *collate-variable*
 v:collate	The current locale setting for collation order of the runtime
 		environment.  This allows Vim scripts to be aware of the
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 229ce13fd3..e221fe3e29 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 22
+*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 28
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -3567,6 +3567,10 @@ A jump table for the options with a short description can be found at |Q_op|.
 	The expression is evaluated only once per |:find| command invocation.
 	The expression can process all the directories specified in 'path'.
 
+	The expression may be evaluated for command-line completion as well,
+	in which case the |v:cmdcomplete| variable will be set to |v:true|,
+	otherwise it will be set to |v:false|.
+
 	If a match is found, the expression should return a |List| containing
 	one or more file names.  If a match is not found, the expression
 	should return an empty List.
@@ -3586,7 +3590,8 @@ A jump table for the options with a short description can be found at |Q_op|.
 >
 	    " Use glob()
 	    func FindExprGlob()
-		return glob(v:fname, v:false, v:true)
+		let pat = v:cmdcomplete ? $'{v:fname}*' : v:fname
+		return glob(pat, v:false, v:true)
 	    endfunc
 	    set findexpr=FindExprGlob()
 
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 9e93a75389..886b28c987 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -6510,6 +6510,7 @@ close_cb	channel.txt	/*close_cb*
 closure	eval.txt	/*closure*
 cmdarg-variable	eval.txt	/*cmdarg-variable*
 cmdbang-variable	eval.txt	/*cmdbang-variable*
+cmdcomplete-variable	eval.txt	/*cmdcomplete-variable*
 cmdline-arguments	vi_diff.txt	/*cmdline-arguments*
 cmdline-changed	version5.txt	/*cmdline-changed*
 cmdline-completion	cmdline.txt	/*cmdline-completion*
@@ -10933,6 +10934,7 @@ v:charconvert_from	eval.txt	/*v:charconvert_from*
 v:charconvert_to	eval.txt	/*v:charconvert_to*
 v:cmdarg	eval.txt	/*v:cmdarg*
 v:cmdbang	eval.txt	/*v:cmdbang*
+v:cmdcomplete	eval.txt	/*v:cmdcomplete*
 v:collate	eval.txt	/*v:collate*
 v:colornames	eval.txt	/*v:colornames*
 v:completed_item	eval.txt	/*v:completed_item*
diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 406135cffb..3862d69eda 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -50,6 +50,7 @@ cmdline_fuzzy_completion_supported(expand_T *xp)
 	    && xp->xp_context != EXPAND_FILES
 	    && xp->xp_context != EXPAND_FILES_IN_PATH
 	    && xp->xp_context != EXPAND_FILETYPE
+	    && xp->xp_context != EXPAND_FINDEXPR
 	    && xp->xp_context != EXPAND_HELP
 	    && xp->xp_context != EXPAND_KEYMAP
 	    && xp->xp_context != EXPAND_OLD_SETTING
@@ -1418,7 +1419,8 @@ addstar(
 
 	// For help tags the translation is done in find_help_tags().
 	// For a tag pattern starting with "/" no translation is needed.
-	if (context == EXPAND_HELP
+	if (context == EXPAND_FINDEXPR
+		|| context == EXPAND_HELP
 		|| context == EXPAND_COLORS
 		|| context == EXPAND_COMPILER
 		|| context == EXPAND_OWNSYNTAX
@@ -2138,7 +2140,8 @@ set_context_by_cmdname(
 	case CMD_sfind:
 	case CMD_tabfind:
 	    if (xp->xp_context == EXPAND_FILES)
-		xp->xp_context = EXPAND_FILES_IN_PATH;
+		xp->xp_context = *get_findexpr() != NUL ? EXPAND_FINDEXPR
+							: EXPAND_FILES_IN_PATH;
 	    break;
 	case CMD_cd:
 	case CMD_chdir:
@@ -2850,7 +2853,7 @@ expand_files_and_dirs(
 	    }
     }
 
-    if (xp->xp_context == EXPAND_FILES_IN_PATH && *get_findexpr() != NUL)
+    if (xp->xp_context == EXPAND_FINDEXPR)
     {
 #ifdef FEAT_EVAL
 	ret = expand_findexpr(pat, matches, numMatches);
@@ -3119,6 +3122,7 @@ ExpandFromContext(
     if (xp->xp_context == EXPAND_FILES
 	    || xp->xp_context == EXPAND_DIRECTORIES
 	    || xp->xp_context == EXPAND_FILES_IN_PATH
+	    || xp->xp_context == EXPAND_FINDEXPR
 	    || xp->xp_context == EXPAND_DIRS_IN_CDPATH)
 	return expand_files_and_dirs(xp, pat, matches, numMatches, flags,
 								options);
diff --git a/src/errors.h b/src/errors.h
index 2299f2c50c..6c172e09c0 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3653,4 +3653,4 @@ EXTERN char e_wrong_character_width_for_field_str[]
 EXTERN char e_winfixbuf_cannot_go_to_buffer[]
 	INIT(= N_("E1513: Cannot switch buffer. 'winfixbuf' is enabled"));
 EXTERN char e_invalid_return_type_from_findexpr[]
-	INIT(= N_("E1514: findexpr did not return a List type"));
+	INIT(= N_("E1514: 'findexpr' did not return a List type"));
diff --git a/src/evalvars.c b/src/evalvars.c
index f18b51637b..9f03ada09a 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -161,6 +161,7 @@ static struct vimvar
     {VV_NAME("t_typealias",	 VAR_NUMBER), NULL, VV_RO},
     {VV_NAME("t_enum",		 VAR_NUMBER), NULL, VV_RO},
     {VV_NAME("t_enumvalue",	 VAR_NUMBER), NULL, VV_RO},
+    {VV_NAME("cmdcomplete",	 VAR_BOOL), NULL, VV_RO},
 };
 
 // shorthand
@@ -234,6 +235,7 @@ evalvars_init(void)
     set_vim_var_nr(VV_SEARCHFORWARD, 1L);
     set_vim_var_nr(VV_HLSEARCH, 1L);
     set_vim_var_nr(VV_EXITING, VVAL_NULL);
+    set_vim_var_nr(VV_CMDCOMPLETE, VVAL_FALSE);
     set_vim_var_dict(VV_COMPLETED_ITEM, dict_alloc_lock(VAR_FIXED));
     set_vim_var_list(VV_ERRORS, list_alloc());
     set_vim_var_dict(VV_EVENT, dict_alloc_lock(VAR_FIXED));
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index fa370fefc9..807b470d8b 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -6929,7 +6929,7 @@ ex_wrongmodifier(exarg_T *eap)
  * the expression, v:fname is set to the ":find" command argument.
  */
     static list_T *
-eval_findexpr(char_u *ptr)
+eval_findexpr(char_u *pat, int cmdcomplete)
 {
     sctx_T	saved_sctx = current_sctx;
     char_u	*findexpr;
@@ -6939,7 +6939,8 @@ eval_findexpr(char_u *ptr)
 
     findexpr = get_findexpr();
 
-    set_vim_var_string(VV_FNAME, ptr, -1);
+    set_vim_var_string(VV_FNAME, pat, -1);
+    set_vim_var_nr(VV_CMDCOMPLETE, cmdcomplete ? VVAL_TRUE : VVAL_FALSE);
     current_sctx = curbuf->b_p_script_ctx[BV_FEXPR];
 
     arg = skipwhite(findexpr);
@@ -6962,6 +6963,7 @@ eval_findexpr(char_u *ptr)
     clear_evalarg(&EVALARG_EVALUATE, NULL);
 
     set_vim_var_string(VV_FNAME, NULL, 0);
+    set_vim_var_nr(VV_CMDCOMPLETE, VVAL_FALSE);
     current_sctx = saved_sctx;
 
     return retlist;
@@ -6977,21 +6979,11 @@ expand_findexpr(char_u *pat, char_u ***files, int *numMatches)
 {
     list_T	*l;
     int		len;
-    char_u	*regpat;
 
     *numMatches = 0;
     *files = NULL;
 
-    // File name expansion uses wildchars.  But the 'findexpr' expression
-    // expects a regular expression argument.  So convert wildchars in the
-    // argument to regular expression patterns.
-    regpat = file_pat_to_reg_pat(pat, NULL, NULL, FALSE);
-    if (regpat == NULL)
-	return FAIL;
-
-    l = eval_findexpr(regpat);
-
-    vim_free(regpat);
+    l = eval_findexpr(pat, TRUE);
 
     if (l == NULL)
 	return FAIL;
@@ -7037,7 +7029,7 @@ findexpr_find_file(char_u *findarg, int findarg_len, int count)
     cc = findarg[findarg_len];
     findarg[findarg_len] = NUL;
 
-    fname_list = eval_findexpr(findarg);
+    fname_list = eval_findexpr(findarg, FALSE);
     fname_count = list_len(fname_list);
 
     if (fname_count == 0)
diff --git a/src/testdir/test_findfile.vim b/src/testdir/test_findfile.vim
index 3a1066bf31..25cd9daa7b 100644
--- a/src/testdir/test_findfile.vim
+++ b/src/testdir/test_findfile.vim
@@ -374,7 +374,7 @@ func Test_findexpr()
 
   " Expression returning a string
   set findexpr='abc'
-  call assert_fails('find Xfindexpr1.c', 'E1514: findexpr did not return a List type')
+  call assert_fails('find Xfindexpr1.c', "E1514: 'findexpr' did not return a List type")
 
   set findexpr&
   delfunc! FindExpr1
@@ -454,29 +454,52 @@ endfunc
 
 " Test for expanding the argument to the :find command using 'findexpr'
 func Test_findexpr_expand_arg()
-  func FindExpr1()
-    let fnames = ['Xfindexpr1.c', 'Xfindexpr2.c', 'Xfindexpr3.c']
-    return fnames->copy()->filter('v:val =~? v:fname')
+  let s:fnames = ['Xfindexpr1.c', 'Xfindexpr2.c', 'Xfindexpr3.c']
+
+  " 'findexpr' that accepts a regular expression
+  func FindExprRegexp()
+    return s:fnames->copy()->filter('v:val =~? v:fname')
   endfunc
-  set findexpr=FindExpr1()
 
-  call feedkeys(":find \<Tab>\<C-B>\"\<CR>", "xt")
-  call assert_equal('"find Xfindexpr1.c', @:)
+  " 'findexpr' that accepts a glob
+  func FindExprGlob()
+    let pat = glob2regpat(v:cmdcomplete ? $'*{v:fname}*' : v:fname)
+    return s:fnames->copy()->filter('v:val =~? pat')
+  endfunc
+
+  for regexp in [v:true, v:false]
+    let &findexpr = regexp ? 'FindExprRegexp()' : 'FindExprGlob()'
+
+    call feedkeys(":find \<Tab>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find Xfindexpr1.c', @:)
+
+    call feedkeys(":find Xfind\<Tab>\<Tab>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find Xfindexpr2.c', @:)
 
-  call feedkeys(":find Xfind\<Tab>\<Tab>\<C-B>\"\<CR>", "xt")
-  call assert_equal('"find Xfindexpr2.c', @:)
+    call assert_equal(s:fnames, getcompletion('find ', 'cmdline'))
+    call assert_equal(s:fnames, getcompletion('find Xfind', 'cmdline'))
 
-  call feedkeys(":find *3*\<Tab>\<C-B>\"\<CR>", "xt")
-  call assert_equal('"find Xfindexpr3.c', @:)
+    let pat = regexp ? 'X.*1\.c' : 'X*1.c'
+    call feedkeys($":find {pat}\<Tab>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find Xfindexpr1.c', @:)
+    call assert_equal(['Xfindexpr1.c'], getcompletion($'find {pat}', 'cmdline'))
 
-  call feedkeys(":find Xfind\<C-A>\<C-B>\"\<CR>", "xt")
-  call assert_equal('"find Xfindexpr1.c Xfindexpr2.c Xfindexpr3.c', @:)
+    call feedkeys(":find 3\<Tab>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find Xfindexpr3.c', @:)
+    call assert_equal(['Xfindexpr3.c'], getcompletion($'find 3', 'cmdline'))
 
-  call feedkeys(":find abc\<Tab>\<C-B>\"\<CR>", "xt")
-  call assert_equal('"find abc', @:)
+    call feedkeys(":find Xfind\<C-A>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find Xfindexpr1.c Xfindexpr2.c Xfindexpr3.c', @:)
+
+    call feedkeys(":find abc\<Tab>\<C-B>\"\<CR>", "xt")
+    call assert_equal('"find abc', @:)
+    call assert_equal([], getcompletion('find abc', 'cmdline'))
+  endfor
 
   set findexpr&
-  delfunc! FindExpr1
+  delfunc! FindExprRegexp
+  delfunc! FindExprGlob
+  unlet s:fnames
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index e042965678..6abc802840 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    821,
+/**/
     820,
 /**/
     819,
diff --git a/src/vim.h b/src/vim.h
index 74e6b95435..f4acaf92fa 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -845,6 +845,7 @@ extern int (*dyn_libintl_wputenv)(const wchar_t *envstring);
 #define EXPAND_KEYMAP		58
 #define EXPAND_DIRS_IN_CDPATH	59
 #define EXPAND_SHELLCMDLINE	60
+#define EXPAND_FINDEXPR		61
 
 
 // Values for exmode_active (0 is no exmode)
@@ -2188,7 +2189,8 @@ typedef int sock_T;
 #define VV_TYPE_TYPEALIAS 107
 #define VV_TYPE_ENUM	  108
 #define VV_TYPE_ENUMVALUE 109
-#define VV_LEN		110	// number of v: vars
+#define VV_CMDCOMPLETE	110
+#define VV_LEN		111	// number of v: vars
 
 // used for v_number in VAR_BOOL and VAR_SPECIAL
 #define VVAL_FALSE	0L	// VAR_BOOL