Add a common commit parser

Make a better commit parser, replacing the ugly one in ui-log.c

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

cgit.h

@@ -15,6 +15,14 @@ struct cacheitem {
 	int fd;
 };
 
+struct commitinfo {
+	struct commit *commit;
+	char *author;
+	char *committer;
+	char *subject;
+	char *msg;
+};
+
 extern const char cgit_version[];
 
 extern char *cgit_root;
@@ -63,6 +71,7 @@ extern void html_link_close(void);
 
 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 void cache_prepare(struct cacheitem *item);
 extern int cache_lock(struct cacheitem *item);

parsing.c

@@ -104,3 +104,56 @@ int cgit_parse_query(char *txt, configfn fn)
 		(*fn)(txt, value);
 	return 0;
 }
+
+char *substr(const char *head, const char *tail)
+{
+	char *buf;
+
+	buf = xmalloc(tail - head + 1);
+	strncpy(buf, head, tail - head);
+	buf[tail - head] = '\0';
+	return buf;
+}
+
+struct commitinfo *cgit_parse_commit(struct commit *commit)
+{
+	struct commitinfo *ret;
+	char *p = commit->buffer, *t = commit->buffer;
+
+	ret = xmalloc(sizeof(*ret));
+	ret->commit = commit;
+
+	if (strncmp(p, "tree ", 5))
+		die("Bad commit: %s", sha1_to_hex(commit->object.sha1));
+	else
+		p += 46; // "tree " + hex[40] + "\n"
+
+	while (!strncmp(p, "parent ", 7))
+		p += 48; // "parent " + hex[40] + "\n"
+
+	if (!strncmp(p, "author ", 7)) {
+		p += 7;
+		t = strchr(p, '<') - 1;
+		ret->author = substr(p, t);
+		p = strchr(p, '\n') + 1;
+	}
+
+	if (!strncmp(p, "committer ", 9)) {
+		p += 9;
+		t = strchr(p, '<') - 1;
+		ret->committer = substr(p, t);
+		p = strchr(p, '\n') + 1;
+	}
+
+	while (*p == '\n')
+		p = strchr(p, '\n') + 1;
+
+	t = strchr(p, '\n');
+	ret->subject = substr(p, t);
+
+	while (*p == '\n')
+		p = strchr(p, '\n') + 1;
+	ret->msg = p;
+
+	return ret;
+}

ui-log.c

@@ -8,69 +8,14 @@
 
 #include "cgit.h"
 
-static int get_one_line(char *txt)
+void print_commit(struct commit *commit)
 {
-	char *t;
-
-	for(t=txt; *t != '\n' && t != '\0'; t++)
-		;
-	*t = '\0';
-	return t-txt-1;
-}
-
-static void cgit_print_commit_shortlog(struct commit *commit)
-{
-	char *h, *t, *p; 
-	char *tree = NULL, *author = NULL, *subject = NULL;
-	int len;
-	time_t sec;
-	struct tm *time;
 	char buf[32];
+	struct commitinfo *info;
+	struct tm *time;
 
-	h = t = commit->buffer;
+	info = cgit_parse_commit(commit);
-	
+	time = gmtime(&commit->date);
-	if (strncmp(h, "tree ", 5))
-		die("Bad commit format: %s", 
-		    sha1_to_hex(commit->object.sha1));
-	
-	len = get_one_line(h);
-	tree = h+5;
-	h += len + 2;
-
-	while (!strncmp(h, "parent ", 7))
-		h += get_one_line(h) + 2;
-	
-	if (!strncmp(h, "author ", 7)) {
-		author = h+7;
-		h += get_one_line(h) + 2;
-		t = author;
-		while(t!=h && *t!='<') 
-			t++;
-		*t='\0';
-		p = t;
-		while(--t!=author && *t==' ')
-			*t='\0';
-		while(++p!=h && *p!='>')
-			;
-		while(++p!=h && !isdigit(*p))
-			;
-
-		t = p;
-		while(++p && isdigit(*p))
-			;
-		*p = '\0';
-		sec = atoi(t);
-		time = gmtime(&sec);
-	}
-
-	while((len = get_one_line(h)) > 0)
-		h += len+2;
-
-	h++;
-	len = get_one_line(h);
-
-	subject = h;
-
 	html("<tr><td>");
 	strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
 	html_txt(buf);
@@ -78,18 +23,23 @@ static void cgit_print_commit_shortlog(struct commit *commit)
 	char *qry = fmt("id=%s", sha1_to_hex(commit->object.sha1));
 	char *url = cgit_pageurl(cgit_query_repo, "view", qry);
 	html_link_open(url, NULL, NULL);
-	html_txt(subject);
+	html_txt(info->subject);
 	html_link_close();
 	html("</td><td>");
-	html_txt(author);
+	html_txt(info->author);
 	html("</td><td><a href='");
 	html_attr(cgit_pageurl(cgit_query_repo, "tree", 
 			       fmt("id=%s", 
 				   sha1_to_hex(commit->tree->object.sha1))));
 	html("'>tree</a>");
 	html("</td></tr>\n");
+	free(info->author);
+	free(info->committer);
+	free(info->subject);
+	free(info);
 }
 
+
 void cgit_print_log(const char *tip, int ofs, int cnt)
 {
 	struct rev_info rev;
@@ -120,7 +70,7 @@ void cgit_print_log(const char *tip, int ofs, int cnt)
 	}
 
 	for (i = 0; i < cnt && (commit = get_revision(&rev)) != NULL; i++) {
-		cgit_print_commit_shortlog(commit);
+		print_commit(commit);
 		free(commit->buffer);
 		commit->buffer = NULL;
 		free_commit_list(commit->parents);