Add function cgit_parse_tag()

Teach cgit how to extract author info from a tag.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.h

@@ -27,6 +27,13 @@ struct commitinfo {
 	char *msg;
 };
 
+struct taginfo {
+	char *tagger;
+	char *tagger_email;
+	int tagger_date;
+	char *msg;
+};
+
 extern const char cgit_version[];
 
 extern char *cgit_root;
@@ -87,6 +94,7 @@ extern void html_filemode(unsigned short mode);
 extern int cgit_read_config(const char *filename, configfn fn);
 extern int cgit_parse_query(char *txt, configfn fn);
 extern struct commitinfo *cgit_parse_commit(struct commit *commit);
+extern struct taginfo *cgit_parse_tag(struct tag *tag);
 
 extern char *cache_safe_filename(const char *unsafe);
 extern int cache_lock(struct cacheitem *item);

parsing.c

@@ -196,3 +196,50 @@ struct commitinfo *cgit_parse_commit(struct commit *commit)
 	}
 	return ret;
 }
+
+
+struct taginfo *cgit_parse_tag(struct tag *tag)
+{
+	void *data;
+	char type[20];
+	unsigned long size;
+	char *p, *t;
+	struct taginfo *ret;
+
+	data = read_sha1_file(tag->object.sha1, type, &size);
+	if (!data || strcmp(type, tag_type)) {
+		free(data);
+		return 0;
+	}
+	
+	ret = xmalloc(sizeof(*ret));
+	ret->tagger = NULL;
+	ret->tagger_email = NULL;
+	ret->tagger_date = 0;
+	ret->msg = NULL;
+
+	p = data;
+
+	while (p) {
+		if (*p == '\n')
+			break;
+
+		if (!strncmp(p, "tagger ", 7)) {
+			p += 7;
+			t = strchr(p, '<') - 1;
+			ret->tagger = substr(p, t);
+			p = t;
+			t = strchr(t, '>') + 1;
+			ret->tagger_email = substr(p, t);
+			ret->tagger_date = atol(++t);
+		}
+		p = strchr(p, '\n') + 1;
+	}
+
+	while (p && (*p == '\n'))
+		p = strchr(p, '\n') + 1;
+	if (p)
+		ret->msg = xstrdup(p);
+	free(data);
+	return ret;
+}