1 files changed, 31 insertions, 33 deletions

diff --git a/ui-diff.c b/ui-diff.c
index 5c864d9..a76a234 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -1,142 +1,140 @@
 /* ui-diff.c: show diff between two blobs
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 
 /*
  * print a single line returned from xdiff
  */
 static void print_line(char *line, int len)
 {
 	char *class = "ctx";
 	char c = line[len-1];
 
 	if (line[0] == '+')
 		class = "add";
 	else if (line[0] == '-')
 		class = "del";
 	else if (line[0] == '@')
 		class = "hunk";
 
 	htmlf("<div class='%s'>", class);
 	line[len-1] = '\0';
 	html_txt(line);
 	html("</div>");
 	line[len-1] = c;
 }
 
 static void header(unsigned char *sha1, char *path1, int mode1,
 		   unsigned char *sha2, char *path2, int mode2)
 {
 	char *abbrev1, *abbrev2;
 	int subproject;
 
 	subproject = (S_ISDIRLNK(mode1) || S_ISDIRLNK(mode2));
 	html("<div class='head'>");
 	html("diff --git a/");
 	html_txt(path1);
 	html(" b/");
 	html_txt(path2);
 
 	if (is_null_sha1(sha1))
 		path1 = "dev/null";
 	if (is_null_sha1(sha2))
 		path2 = "dev/null";
 
 	if (mode1 == 0)
 		htmlf("<br/>new file mode %.6o", mode2);
 
 	if (mode2 == 0)
 		htmlf("<br/>deleted file mode %.6o", mode1);
 
 	if (!subproject) {
 		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 		htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 		free(abbrev1);
 		free(abbrev2);
 		if (mode1 != 0 && mode2 != 0) {
 			htmlf(" %.6o", mode1);
 			if (mode2 != mode1)
 				htmlf("..%.6o", mode2);
 		}
 		html("<br/>--- a/");
 		html_txt(path1);
 		html("<br/>+++ b/");
 		html_txt(path2);
 	}
 	html("</div>");
 }
 
 static void filepair_cb(struct diff_filepair *pair)
 {
 	header(pair->one->sha1, pair->one->path, pair->one->mode,
 	       pair->two->sha1, pair->two->path, pair->two->mode);
 	if (S_ISDIRLNK(pair->one->mode) || S_ISDIRLNK(pair->two->mode)) {
 		if (S_ISDIRLNK(pair->one->mode))
 			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 		if (S_ISDIRLNK(pair->two->mode))
 			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 		return;
 	}
 	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 		cgit_print_error("Error running diff");
 }
 
-void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
+void cgit_print_diff(const char *new_rev, const char *old_rev)
 {
 	unsigned char sha1[20], sha2[20];
 	enum object_type type;
 	unsigned long size;
-	struct commit *commit;
+	struct commit *commit, *commit2;
 
-	html("<table class='diff'>");
-	html("<tr><td>");
-
-	if (head && !old_hex && !new_hex) {
-		get_sha1(head, sha1);
-		commit = lookup_commit_reference(sha1);
-		if (commit && !parse_commit(commit))
-			cgit_diff_commit(commit, filepair_cb);
-		else
-			cgit_print_error(fmt("Bad commit: %s", head));
-		html("</td></tr>");
-		html("</table>");
+	if (!new_rev)
+		new_rev = cgit_query_head;
+	get_sha1(new_rev, sha1);
+	type = sha1_object_info(sha1, &size);
+	if (type == OBJ_BAD) {
+		cgit_print_error(fmt("Bad object name: %s", new_rev));
+		return;
+	}
+	if (type != OBJ_COMMIT) {
+		cgit_print_error(fmt("Unhandled object type: %s",
+				     typename(type)));
 		return;
 	}
 
-	get_sha1(old_hex, sha1);
-	get_sha1(new_hex, sha2);
+	commit = lookup_commit_reference(sha1);
+	if (!commit || parse_commit(commit))
+		cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(sha1)));
 
-	type = sha1_object_info(sha1, &size);
-	if (type == OBJ_BAD) {
+	if (old_rev)
+		get_sha1(old_rev, sha2);
+	else if (commit->parents && commit->parents->item)
+		hashcpy(sha2, commit->parents->item->object.sha1);
+	else
+		hashclr(sha2);
+
+	if (!is_null_sha1(sha2)) {
 		type = sha1_object_info(sha2, &size);
 		if (type == OBJ_BAD) {
-			cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
+			cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(sha2)));
 			return;
 		}
+		commit2 = lookup_commit_reference(sha2);
+		if (!commit2 || parse_commit(commit2))
+			cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(sha2)));
 	}
 
-	switch(type) {
-	case OBJ_BLOB:
-		header(sha1, path, 0644, sha2, path, 0644);
-		if (cgit_diff_files(sha1, sha2, print_line))
-			cgit_print_error("Error running diff");
-		break;
-	case OBJ_TREE:
-		cgit_diff_tree(sha1, sha2, filepair_cb);
-		break;
-	default:
-		cgit_print_error(fmt("Unhandled object type: %s",
-				     typename(type)));
-		break;
-	}
+	html("<table class='diff'>");
+	html("<tr><td>");
+	cgit_diff_tree(sha2, sha1, filepair_cb);
 	html("</td></tr>");
 	html("</table>");
 }