[v10,20/21] stash: optimize `get_untracked_files()` and `check_changes()`
diff mbox series

Message ID 171db39a89b57a907b0baa3f6d783c6dab62806c.1539553398.git.ungureanupaulsebastian@gmail.com
State New
Headers show
Series
  • Convert "git stash" to C builtin
Related show

Commit Message

Paul-Sebastian Ungureanu Oct. 14, 2018, 10:11 p.m. UTC
This commits introduces a optimization by avoiding calling the
same functions again. For example, `git stash push -u`
would call at some points the following functions:

 * `check_changes()` (inside `do_push_stash()`)
 * `do_create_stash()`, which calls: `check_changes()` and
`get_untracked_files()`

Note that `check_changes()` also calls `get_untracked_files()`.
So, `check_changes()` is called 2 times and `get_untracked_files()`
3 times.

The old function `check_changes()` now consists of two functions:
`get_untracked_files()` and `check_changes_tracked_files()`.

These are the call chains for `push` and `create`:

 * `push_stash()` -> `do_push_stash()` -> `do_create_stash()`

 * `create_stash()` -> `do_create_stash()`

To prevent calling the same functions over and over again,
`check_changes()` inside `do_create_stash()` is now placed
in the caller functions (`create_stash()` and `do_push_stash()`).
This way `check_changes()` and `get_untracked files()` are called
only one time.

https://public-inbox.org/git/20180818223329.GJ11326@hank.intra.tgummerer.com/

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash.c | 50 ++++++++++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 21 deletions(-)

Patch
diff mbox series

diff --git a/builtin/stash.c b/builtin/stash.c
index e945c13c42..d2365ada2e 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -881,18 +881,18 @@  static int get_untracked_files(struct pathspec ps, int include_untracked,
 }
 
 /*
- * The return value of `check_changes()` can be:
+ * The return value of `check_changes_tracked_files()` can be:
  *
  * < 0 if there was an error
  * = 0 if there are no changes.
  * > 0 if there are changes.
  */
-static int check_changes(struct pathspec ps, int include_untracked)
+
+static int check_changes_tracked_files(struct pathspec ps)
 {
 	int result;
 	struct rev_info rev;
 	struct object_id dummy;
-	struct strbuf out = STRBUF_INIT;
 
 	/* No initial commit. */
 	if (get_oid("HEAD", &dummy))
@@ -920,14 +920,26 @@  static int check_changes(struct pathspec ps, int include_untracked)
 	if (diff_result_code(&rev.diffopt, result))
 		return 1;
 
+	return 0;
+}
+
+/*
+ * The function will fill `untracked_files` with the names of untracked files
+ * It will return 1 if there were any changes and 0 if there were not.
+ */
+
+static int check_changes(struct pathspec ps, int include_untracked,
+			 struct strbuf *untracked_files)
+{
+	int ret = 0;
+	if (check_changes_tracked_files(ps))
+		ret = 1;
+
 	if (include_untracked && get_untracked_files(ps, include_untracked,
-						     &out)) {
-		strbuf_release(&out);
-		return 1;
-	}
+						     untracked_files))
+		ret = 1;
 
-	strbuf_release(&out);
-	return 0;
+	return ret;
 }
 
 static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
@@ -1138,7 +1150,7 @@  static int do_create_stash(struct pathspec ps, char **stash_msg,
 		head_commit = lookup_commit(the_repository, &info->b_commit);
 	}
 
-	if (!check_changes(ps, include_untracked)) {
+	if (!check_changes(ps, include_untracked, &untracked_files)) {
 		ret = 1;
 		goto done;
 	}
@@ -1163,8 +1175,7 @@  static int do_create_stash(struct pathspec ps, char **stash_msg,
 		goto done;
 	}
 
-	if (include_untracked && get_untracked_files(ps, include_untracked,
-						     &untracked_files)) {
+	if (include_untracked) {
 		if (save_untracked_files(info, &msg, untracked_files)) {
 			if (!quiet)
 				fprintf_ln(stderr, _("Cannot save "
@@ -1244,19 +1255,15 @@  static int create_stash(int argc, const char **argv, const char *prefix)
 	stash_msg = stash_msg_buf.buf;
 
 	memset(&ps, 0, sizeof(ps));
-	ret = do_create_stash(ps, &stash_msg, 0, 0, &info, NULL, 0);
+	if (!check_changes_tracked_files(ps))
+		return 0;
 
-	if (!ret)
+	if (!(ret = do_create_stash(ps, &stash_msg, 0, 0, &info, NULL, 0)))
 		printf_ln("%s", oid_to_hex(&info.w_commit));
 
 	strbuf_release(&stash_msg_buf);
 	free(stash_msg);
-
-	/*
-	 * ret can be 1 if there were no changes. In this case, we should
-	 * not error out.
-	 */
-	return ret < 0;
+	return ret;
 }
 
 static int do_push_stash(struct pathspec ps, char *stash_msg, int quiet,
@@ -1265,6 +1272,7 @@  static int do_push_stash(struct pathspec ps, char *stash_msg, int quiet,
 	int ret = 0;
 	struct stash_info info;
 	struct strbuf patch = STRBUF_INIT;
+	struct strbuf untracked_files = STRBUF_INIT;
 
 	if (patch_mode && keep_index == -1)
 		keep_index = 1;
@@ -1299,7 +1307,7 @@  static int do_push_stash(struct pathspec ps, char *stash_msg, int quiet,
 		goto done;
 	}
 
-	if (!check_changes(ps, include_untracked)) {
+	if (!check_changes(ps, include_untracked, &untracked_files)) {
 		if (!quiet)
 			printf_ln(_("No local changes to save"));
 		goto done;