Add support for commitdiff via h parameter

The commitdiff will be generated against the first parent, and the
diff page also gets the benefit of repo.defbranch.

Cleaned up some bad whitespace in cgit.h while at it.

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

3 files changed, 17 insertions, 3 deletions

diff --git a/cgit.c b/cgit.c
index 9b4815d..3e7e595 100644
--- a/cgit.c
+++ b/cgit.c
@@ -120,7 +120,8 @@ static void cgit_print_repo_page(struct cacheitem *item)
 	} else if (!strcmp(cgit_query_page, "view")) {
 		cgit_print_view(cgit_query_sha1, cgit_query_path);
 	} else if (!strcmp(cgit_query_page, "diff")) {
-		cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
+		cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
+				cgit_query_path);
 	} else {
 		cgit_print_error("Invalid request");
 	}
diff --git a/cgit.h b/cgit.h
index ac710a6..764225d 100644
--- a/cgit.h
+++ b/cgit.h
@@ -176,7 +176,8 @@ extern void cgit_print_view(const char *hex, char *path);
 extern void cgit_print_blob(struct cacheitem *item, const char *hex, char *path);
 extern void cgit_print_tree(const char *rev, const char *hex, char *path);
 extern void cgit_print_commit(const char *hex);
-extern void cgit_print_diff(const char *old_hex, const char *new_hex, char *path);
+extern void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex,
+			    char *path);
 extern void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
 				const char *format, const char *prefix,
 				const char *filename);
diff --git a/ui-diff.c b/ui-diff.c
index 999b6f3..afe1c90 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -66,11 +66,23 @@ static void filepair_cb(struct diff_filepair *pair)
 	html("</tr></td>");
 }
 
-void cgit_print_diff(const char *old_hex, const char *new_hex, char *path)
+void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
 {
 	unsigned char sha1[20], sha2[20];
 	enum object_type type;
 	unsigned long size;
+	struct commit *commit;
+
+	if (head && !old_hex && !new_hex) {
+		get_sha1(head, sha1);
+		commit = lookup_commit_reference(sha1);
+		if (commit && !parse_commit(commit)) {
+			html("<table class='diff'>");
+			cgit_diff_commit(commit, filepair_cb);
+			html("</td></tr></table>");
+		}
+		return;
+	}
 
 	get_sha1(old_hex, sha1);
 	get_sha1(new_hex, sha2);