[PATCH v4 2/3] pretty: add infrastructure to allow format aliases

[Will Palmer <wmpalmer@gmail.com>]

here we modify the find_commit_format function to make it recursively
dereference aliases when they are specified. At this point, there are
no aliases specified and there is no way to specify an alias, but the
support is there for any which are added.

Signed-off-by: Will Palmer <wmpalmer@gmail.com>
---
 pretty.c |   28 +++++++++++++++++++++++++---
 1 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/pretty.c b/pretty.c
index ecac8f5..4029cc8 100644
--- a/pretty.c
+++ b/pretty.c
@@ -15,6 +15,8 @@ static struct cmt_fmt_map {
 	const char *name;
 	enum cmit_fmt format;
 	int is_tformat;
+	int is_alias;
+	const char *user_format;
 } *commit_formats;
 static size_t commit_formats_len;
 static struct cmt_fmt_map *find_commit_format(const char *sought);
@@ -46,14 +48,19 @@ static void setup_commit_formats(void)
 	       sizeof(*builtin_formats)*ARRAY_SIZE(builtin_formats));
 }
 
-static struct cmt_fmt_map *find_commit_format(const char *sought)
+static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
+							const char *original,
+							int num_redirections)
 {
 	struct cmt_fmt_map *found = NULL;
 	size_t found_match_len;
 	int i;
 
-	if (!commit_formats)
-		setup_commit_formats();
+	if (num_redirections >= commit_formats_len) {
+		die("invalid --pretty format: '%s' references an alias which "
+		    "points to itself", original);
+		return NULL;
+	}
 
 	for (i = 0; i < commit_formats_len; i++) {
 		size_t match_len;
@@ -67,9 +74,24 @@ static struct cmt_fmt_map *find_commit_format(const char *sought)
 			found_match_len = match_len;
 		}
 	}
+
+	if (found && found->is_alias) {
+		found = find_commit_format_recursive(found->user_format,
+						     original,
+						     num_redirections+1);
+	}
+
 	return found;
 }
 
+static struct cmt_fmt_map *find_commit_format(const char *sought)
+{
+	if (!commit_formats)
+		setup_commit_formats();
+
+	return find_commit_format_recursive(sought, sought, 0);
+}
+
 void get_commit_format(const char *arg, struct rev_info *rev)
 {
 	struct cmt_fmt_map *commit_format;
-- 
1.7.1.rc1.13.gbb0a0a.dirty