[PATCH 5/5] Split out the actual commit creation from the option parsing etc.

["Kristian Høgsberg" <krh@redhat.com>]

From: Kristian Høgsberg <krh@redhat.com>

The functionality is available inside git through the function
create_commit().

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
---
 builtin-commit-tree.c |   96 ++++++++++++++++++++++++++++++------------------
 commit.h              |    7 ++++
 2 files changed, 67 insertions(+), 36 deletions(-)

diff --git a/builtin-commit-tree.c b/builtin-commit-tree.c
index 72884eb..e20f0b4 100644
--- a/builtin-commit-tree.c
+++ b/builtin-commit-tree.c
@@ -52,15 +52,59 @@ static const char commit_utf8_warn[] =
 "You may want to amend it after fixing the message, or set the config\n"
 "variable i18n.commitencoding to the encoding your project uses.\n";
 
+const unsigned char *
+create_commit(const unsigned char *tree_sha1,
+	      unsigned char parent_sha1[][20], int parents,
+	      const char *author_info, const char *committer_info,
+	      const char *message, int length)
+{
+	static unsigned char commit_sha1[20];
+	int encoding_is_utf8, i;
+	struct strbuf sb;
+
+	/* Not having i18n.commitencoding is the same as having utf-8 */
+	encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
+
+	strbuf_init(&sb);
+	strbuf_printf(&sb, "tree %s\n", sha1_to_hex(tree_sha1));
+
+	/*
+	 * NOTE! This ordering means that the same exact tree merged with a
+	 * different order of parents will be a _different_ changeset even
+	 * if everything else stays the same.
+	 */
+	for (i = 0; i < parents; i++)
+		strbuf_printf(&sb, "parent %s\n", sha1_to_hex(parent_sha1[i]));
+
+	/* Person/date information */
+	strbuf_printf(&sb, "author %s\n", author_info);
+	strbuf_printf(&sb, "committer %s\n", committer_info);
+	if (!encoding_is_utf8)
+		strbuf_printf(&sb, "encoding %s\n", git_commit_encoding);
+	strbuf_printf(&sb, "\n");
+
+	/* And add the comment */
+	strbuf_add(&sb, message, length);
+
+	/* And check the encoding */
+	strbuf_add_char(&sb, '\0');
+	if (encoding_is_utf8 && !is_utf8(sb.buf))
+		fprintf(stderr, commit_utf8_warn);
+
+	if (!write_sha1_file(sb.buf, sb.len - 1, commit_type, commit_sha1))
+		return commit_sha1;
+
+	return NULL;
+}
+
 int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	int parents = 0;
 	unsigned char tree_sha1[20];
-	unsigned char commit_sha1[20];
-	char comment[1000];
-	struct strbuf sb;
-	int encoding_is_utf8;
+	char *buffer;
+	unsigned long len;
+	const unsigned char *commit_sha1;
 
 	git_config(git_default_config);
 
@@ -85,40 +129,20 @@ int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 			parents++;
 	}
 
-	/* Not having i18n.commitencoding is the same as having utf-8 */
-	encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
+	buffer = NULL;
+	if (read_fd(0, &buffer, &len))
+		die("Could not read commit message from standard input");
 
-	strbuf_init(&sb);
-	strbuf_printf(&sb, "tree %s\n", sha1_to_hex(tree_sha1));
+	commit_sha1 = create_commit(tree_sha1,
+				    parent_sha1, parents,
+				    xstrdup(git_author_info(1)),
+				    xstrdup(git_committer_info(1)),
+				    buffer, len);
 
-	/*
-	 * NOTE! This ordering means that the same exact tree merged with a
-	 * different order of parents will be a _different_ changeset even
-	 * if everything else stays the same.
-	 */
-	for (i = 0; i < parents; i++)
-		strbuf_printf(&sb, "parent %s\n", sha1_to_hex(parent_sha1[i]));
-
-	/* Person/date information */
-	strbuf_printf(&sb, "author %s\n", git_author_info(1));
-	strbuf_printf(&sb, "committer %s\n", git_committer_info(1));
-	if (!encoding_is_utf8)
-		strbuf_printf(&sb, "encoding %s\n", git_commit_encoding);
-	strbuf_printf(&sb, "\n");
-
-	/* And add the comment */
-	while (fgets(comment, sizeof(comment), stdin) != NULL)
-		strbuf_printf(&sb, "%s", comment);
+	if (!commit_sha1)
+		return 1;
 
-	/* And check the encoding */
-	strbuf_add_char(&sb, '\0');
-	if (encoding_is_utf8 && !is_utf8(sb.buf))
-		fprintf(stderr, commit_utf8_warn);
+	printf("%s\n", sha1_to_hex(commit_sha1));
 
-	if (!write_sha1_file(sb.buf, sb.len - 1, commit_type, commit_sha1)) {
-		printf("%s\n", sha1_to_hex(commit_sha1));
-		return 0;
-	}
-	else
-		return 1;
+	return 0;
 }
diff --git a/commit.h b/commit.h
index 467872e..9f640ba 100644
--- a/commit.h
+++ b/commit.h
@@ -122,4 +122,11 @@ extern struct commit_list *get_shallow_commits(struct object_array *heads,
 		int depth, int shallow_flag, int not_shallow_flag);
 
 int in_merge_bases(struct commit *, struct commit **, int);
+
+extern const unsigned char *
+create_commit(const unsigned char *tree_sha1,
+	      unsigned char parent_sha1[][20], int parents,
+	      const char *author_info, const char *committer_info,
+	      const char *message, int length);
+
 #endif /* COMMIT_H */
-- 
1.5.2.GIT