stash: add --include-untracked support to git stash create

The `git stash create` command now supports the `--include-untracked` flag,
allowing users to include untracked files in the stash entry. This brings
parity with `git stash push`, which already supports this option.

Previously, `git stash create` would only stash tracked changes. With this
change, users can optionally include untracked files by specifying
`--include-untracked`. The implementation involves parsing the new option
in `create_stash` and passing it to `do_create_stash`, which handles the
creation of the stash entry.

The early check for tracked changes was removed to allow stashing when
only untracked files are present. Test cases were added to `t3903-stash.sh`
to ensure the correct behavior, and the documentation was updated
accordingly.

Author: SBhojani

Diff for: Documentation/git-stash.adoc

@@ -21,7 +21,7 @@ SYNOPSIS
 'git stash' save [-p | --patch] [-S | --staged] [-k | --[no-]keep-index] [-q | --quiet]
 	     [-u | --include-untracked] [-a | --all] [<message>]
 'git stash' clear
-'git stash' create [<message>]
+'git stash' create [-u | --include-untracked] [<message>]
 'git stash' store [(-m | --message) <message>] [-q | --quiet] <commit>
 
 DESCRIPTION
@@ -139,11 +139,13 @@ drop [-q|--quiet] [<stash>]::
 
 	Remove a single stash entry from the list of stash entries.
 
-create::
+create [-u | --include-untracked] [<message>]::
 
 	Create a stash entry (which is a regular commit object) and
 	return its object name, without storing it anywhere in the ref
 	namespace.
+	If the `--include-untracked` option is used, all untracked files are
+	also included in the stash entry.
 	This is intended to be useful for scripts.  It is probably not
 	the command you want to use; see "push" above.
 
@@ -170,6 +172,9 @@ up with `git clean`.
 	all untracked files are also stashed and then cleaned up with
 	`git clean`.
 +
+When used with the `create` command, all untracked files are also included
+in the stash entry.
++
 When used with the `show` command, show the untracked files in the stash
 entry as part of the diff.
 

Diff for: builtin/stash.c

@@ -56,7 +56,7 @@
 	N_("git stash save [-p | --patch] [-S | --staged] [-k | --[no-]keep-index] [-q | --quiet]\n" \
 	   "          [-u | --include-untracked] [-a | --all] [<message>]")
 #define BUILTIN_STASH_CREATE_USAGE \
-	N_("git stash create [<message>]")
+	N_("git stash create [-u | --include-untracked] [<message>]")
 #define BUILTIN_STASH_CLEAR_USAGE \
 	"git stash clear"
 
@@ -110,6 +110,11 @@ static const char * const git_stash_clear_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_create_usage[] = {
+	BUILTIN_STASH_CREATE_USAGE,
+	NULL
+};
+
 static const char * const git_stash_store_usage[] = {
 	BUILTIN_STASH_STORE_USAGE,
 	NULL
@@ -1499,22 +1504,28 @@ static int do_create_stash(const struct pathspec *ps, struct strbuf *stash_msg_b
 	return ret;
 }
 
-static int create_stash(int argc, const char **argv, const char *prefix UNUSED,
+static int create_stash(int argc, const char **argv, const char *prefix,
 			struct repository *repo UNUSED)
 {
 	int ret;
+	int include_untracked = 0;
+	struct option options[] = {
+		OPT_BOOL('u', "include-untracked", &include_untracked,
+			N_("include untracked files")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_stash_create_usage, 0);
+
 	struct strbuf stash_msg_buf = STRBUF_INIT;
 	struct stash_info info = STASH_INFO_INIT;
 	struct pathspec ps;
 
-	/* Starting with argv[1], since argv[0] is "create" */
-	strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
+	strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
 
 	memset(&ps, 0, sizeof(ps));
-	if (!check_changes_tracked_files(&ps))
-		return 0;
 
-	ret = do_create_stash(&ps, &stash_msg_buf, 0, 0, 0, &info,
+	ret = do_create_stash(&ps, &stash_msg_buf, include_untracked, 0, 0, &info,
 			      NULL, 0);
 	if (!ret)
 		printf_ln("%s", oid_to_hex(&info.w_commit));

Diff for: t/t3903-stash.sh

@@ -632,6 +632,47 @@ test_expect_success 'stash create - no changes' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'stash create with --include-untracked' '
+    git init repo &&
+    cd repo &&
+    echo committed >file1 &&
+    git add file1 &&
+    git commit -m "initial commit" &&
+    echo staged >file2 &&
+    git add file2 &&
+    echo unstaged >file3 &&
+    echo untracked >untracked_file &&
+    STASH_ID=$(git stash create --include-untracked "test message") &&
+    git cat-file -p $STASH_ID >stash_commit &&
+    grep "test message" stash_commit &&
+    grep "parent" stash_commit | wc -l >parent_count &&
+    echo 3 >expect &&
+    test_cmp expect parent_count &&
+    UNTRACKED_TREE=$(git rev-parse $STASH_ID^3^{tree}) &&
+    git ls-tree $UNTRACKED_TREE >files &&
+    grep untracked_file files &&
+    test_path_is_file untracked_file
+'
+
+test_expect_success 'stash create without --include-untracked does not include untracked files' '
+    git init repo2 &&
+    cd repo2 &&
+    echo committed >file1 &&
+    git add file1 &&
+    git commit -m "initial commit" &&
+    echo staged >file2 &&
+    git add file2 &&
+    echo unstaged >file3 &&
+    echo untracked >untracked_file &&
+    STASH_ID=$(git stash create "test message") &&
+    git cat-file -p $STASH_ID >stash_commit &&
+    grep "test message" stash_commit &&
+    grep "parent" stash_commit | wc -l >parent_count &&
+    echo 2 >expect &&
+    test_cmp expect parent_count &&
+    test_path_is_file untracked_file
+'
+
 test_expect_success 'stash branch - no stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&