Add git_log_link() and fix bug in generic repolink function

The generic repolink function compared head with cgit_query_head, which
almost always would be the same pointer. The test now compares with
repo.defbranch, which is the wanted behavour.

Bug discovered while adding cgit_log_link(), so this commit also contain
that change.

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

ui-shared.c

@@ -127,7 +127,7 @@ static char *repolink(char *title, char *class, char *page, char *head,
 			html_attr(path);
 		delim = "&";
 	}
-	if (head && strcmp(head, cgit_query_head)) {
+	if (head && strcmp(head, cgit_repo->defbranch)) {
 		html(delim);
 		html("h=");
 		html_attr(head);
@@ -136,12 +136,12 @@ static char *repolink(char *title, char *class, char *page, char *head,
 	return fmt("%s", delim);
 }
 
-void cgit_tree_link(char *name, char *title, char *class, char *head,
-		    char *rev, char *path)
+static char *reporevlink(char *page, char *name, char *title, char *class,
+			 char *head, char *rev, char *path)
 {
 	char *delim;
 
-	delim = repolink(title, class, "tree", head, path);
+	delim = repolink(title, class, page, head, path);
 	if (rev && strcmp(rev, cgit_query_head)) {
 		html(delim);
 		html("id=");
@@ -152,6 +152,18 @@ void cgit_tree_link(char *name, char *title, char *class, char *head,
 	html("</a>");
 }
 
+void cgit_tree_link(char *name, char *title, char *class, char *head,
+		    char *rev, char *path)
+{
+	reporevlink("tree", name, title, class, head, rev, path);
+}
+
+void cgit_log_link(char *name, char *title, char *class, char *head,
+		   char *rev, char *path)
+{
+	reporevlink("log", name, title, class, head, rev, path);
+}
+
 void cgit_print_date(time_t secs, char *format)
 {
 	char buf[64];