From 7168624c3530d8c7ee32f930f8fb2ba302b9801f Mon Sep 17 00:00:00 2001
From: Alex Riesen <raa.lkml@gmail.com>
Date: Wed, 28 Nov 2007 22:13:08 +0100
Subject: [PATCH] Do not generate full commit log message if it is not going to
 be used

Like when it is already specified through -C, -F or -m to git-commit.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin-commit.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/builtin-commit.c b/builtin-commit.c
index a35881e20b..1a9a256881 100644
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -367,6 +367,28 @@ static int prepare_log_message(const char *index_file, const char *prefix)
 
 	strbuf_release(&sb);
 
+	if (no_edit) {
+		struct rev_info rev;
+		unsigned char sha1[40];
+
+		fclose(fp);
+
+		if (!active_nr && read_cache() < 0)
+			die("Cannot read index");
+
+		if (get_sha1("HEAD", sha1) != 0)
+			return !!active_nr;
+
+		init_revisions(&rev, "");
+		rev.abbrev = 0;
+		setup_revisions(0, NULL, &rev, "HEAD");
+		DIFF_OPT_SET(&rev.diffopt, QUIET);
+		DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
+		run_diff_index(&rev, 1 /* cached */);
+
+		return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
+	}
+
 	if (in_merge && !no_edit)
 		fprintf(fp,
 			"#\n"