builtin/commit.c: memoize git-path for COMMIT_EDITMSG

This is a follow up commit for f932729c (memoize common git-path
"constant" files, 10-Aug-2015).

The many function calls to git_path() are replaced by
git_path_commit_editmsg() and which thus eliminates the need to repeatedly
compute the location of "COMMIT_EDITMSG".

Mentored-by: Lars Schneider <larsxschneider@gmail.com>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/commit.c b/builtin/commit.c
index 443ff91..18c890e 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -92,8 +92,9 @@ N_("If you wish to skip this commit, use:\n"
 "Then \"git cherry-pick --continue\" will resume cherry-picking\n"
 "the remaining commits.\n");
 
+static GIT_PATH_FUNC(git_path_commit_editmsg, "COMMIT_EDITMSG")
+
 static const char *use_message_buffer;
-static const char commit_editmsg[] = "COMMIT_EDITMSG";
 static struct lock_file index_lock; /* real index */
 static struct lock_file false_lock; /* used only for partial commits */
 static enum {
@@ -772,9 +773,9 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                hook_arg2 = "";
        }
 
-       s->fp = fopen_for_writing(git_path(commit_editmsg));
+       s->fp = fopen_for_writing(git_path_commit_editmsg());
        if (s->fp == NULL)
-               die_errno(_("could not open '%s'"), git_path(commit_editmsg));
+               die_errno(_("could not open '%s'"), git_path_commit_editmsg());
 
        /* Ignore status.displayCommentPrefix: we do need comments in COMMIT_EDITMSG. */
        old_display_comment_prefix = s->display_comment_prefix;
@@ -951,7 +952,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
        }
 
        if (run_commit_hook(use_editor, index_file, "prepare-commit-msg",
-                           git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
+                           git_path_commit_editmsg(), hook_arg1, hook_arg2, NULL))
                return 0;
 
        if (use_editor) {
@@ -959,7 +960,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                const char *env[2] = { NULL };
                env[0] =  index;
                snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
-               if (launch_editor(git_path(commit_editmsg), NULL, env)) {
+               if (launch_editor(git_path_commit_editmsg(), NULL, env)) {
                        fprintf(stderr,
                        _("Please supply the message using either -m or -F option.\n"));
                        exit(1);
@@ -967,7 +968,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
        }
 
        if (!no_verify &&
-           run_commit_hook(use_editor, index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
+           run_commit_hook(use_editor, index_file, "commit-msg", git_path_commit_editmsg(), NULL)) {
                return 0;
        }
 
@@ -1738,7 +1739,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 
        /* Finally, get the commit message */
        strbuf_reset(&sb);
-       if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
+       if (strbuf_read_file(&sb, git_path_commit_editmsg(), 0) < 0) {
                int saved_errno = errno;
                rollback_index_files();
                die(_("could not read commit message: %s"), strerror(saved_errno));