[PATCH] Add 'preserve' subcommand to 'git stash'

["Nadav Goldstein via GitGitGadget" <gitgitgadget@gmail.com>]

From: Nadav Goldstein <nadav.goldstein@blazepod.co>

In this patch, we introduce a new subcommand preserve to
git stash. The purpose of this subcommand is to save the
current changes into the stash and then immediately re-apply
those changes to the working directory.

Implementation-wise, this is achieved by adding a new branch
to the conditional in the cmd_stash function, where we check
if argv[0] is "preserve". If it is, we push_stash with the
new argument that we added to it preserve=1.
In all other cases we call push_stack/do_push_stack preserve=0

Signed-off-by: Nadav Goldstein <nadav.goldstein96@gmail.com>
---
    Add 'preserve' subcommand to 'git stash'
    
    In this patch, we introduce a new subcommand preserve to git stash. The
    purpose of this subcommand is to save the current changes into the stash
    and then immediately re-apply those changes to the working directory.
    
    Implementation-wise, this is achieved by adding a new branch to the
    conditional in the cmd_stash function, where we check if argv[0] is
    "preserve". If it is, we push_stash with the new argument that we added
    to it preserve=1. In all other cases we call push_stack/do_push_stack
    preserve=0
    
    If the community will approve, I will modify the patch to include help
    messages for the new subcommand

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1528%2Fnadav96%2Fstash_preserve-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1528/nadav96/stash_preserve-v1
Pull-Request: https://github.com/git/git/pull/1528

 builtin/stash.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/builtin/stash.c b/builtin/stash.c
index a7e17ffe384..88abf4cc19c 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -1498,7 +1498,7 @@ static int create_stash(int argc, const char **argv, const char *prefix UNUSED)
 }
 
 static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int quiet,
-			 int keep_index, int patch_mode, int include_untracked, int only_staged)
+			 int keep_index, int patch_mode, int include_untracked, int only_staged, int preserve)
 {
 	int ret = 0;
 	struct stash_info info = STASH_INFO_INIT;
@@ -1643,7 +1643,7 @@ static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int q
 				ret = -1;
 				goto done;
 			}
-		} else {
+		} else if (!preserve) {
 			struct child_process cp = CHILD_PROCESS_INIT;
 			cp.git_cmd = 1;
 			/* BUG: this nukes untracked files in the way */
@@ -1709,7 +1709,7 @@ done:
 }
 
 static int push_stash(int argc, const char **argv, const char *prefix,
-		      int push_assumed)
+		      int push_assumed, int preserve)
 {
 	int force_assume = 0;
 	int keep_index = -1;
@@ -1780,14 +1780,19 @@ static int push_stash(int argc, const char **argv, const char *prefix,
 	}
 
 	ret = do_push_stash(&ps, stash_msg, quiet, keep_index, patch_mode,
-			    include_untracked, only_staged);
+			    include_untracked, only_staged, preserve);
 	clear_pathspec(&ps);
 	return ret;
 }
 
 static int push_stash_unassumed(int argc, const char **argv, const char *prefix)
 {
-	return push_stash(argc, argv, prefix, 0);
+	return push_stash(argc, argv, prefix, 0, 0);
+}
+
+static int preserve_stash(int argc, const char **argv, const char *prefix)
+{
+	return push_stash(argc, argv, prefix, 0, 1);
 }
 
 static int save_stash(int argc, const char **argv, const char *prefix)
@@ -1827,7 +1832,7 @@ static int save_stash(int argc, const char **argv, const char *prefix)
 
 	memset(&ps, 0, sizeof(ps));
 	ret = do_push_stash(&ps, stash_msg, quiet, keep_index,
-			    patch_mode, include_untracked, only_staged);
+			    patch_mode, include_untracked, only_staged, 0);
 
 	strbuf_release(&stash_msg_buf);
 	return ret;
@@ -1850,6 +1855,7 @@ int cmd_stash(int argc, const char **argv, const char *prefix)
 		OPT_SUBCOMMAND("store", &fn, store_stash),
 		OPT_SUBCOMMAND("create", &fn, create_stash),
 		OPT_SUBCOMMAND("push", &fn, push_stash_unassumed),
+		OPT_SUBCOMMAND("preserve", &fn, preserve_stash),
 		OPT_SUBCOMMAND_F("save", &fn, save_stash, PARSE_OPT_NOCOMPLETE),
 		OPT_END()
 	};
@@ -1876,5 +1882,5 @@ int cmd_stash(int argc, const char **argv, const char *prefix)
 	/* Assume 'stash push' */
 	strvec_push(&args, "push");
 	strvec_pushv(&args, argv);
-	return !!push_stash(args.nr, args.v, prefix, 1);
+	return !!push_stash(args.nr, args.v, prefix, 1, 0);
 }

base-commit: d7d8841f67f29e6ecbad85a11805c907d0f00d5d
-- 
gitgitgadget