1/* ui-diff.c: show diff between two blobs
 2 *
 3 * Copyright (C) 2006 Lars Hjemli
 4 *
 5 * Licensed under GNU General Public License v2
 6 *   (see COPYING for full license text)
 7 */
 8
 9#include "cgit.h"
10
11
12/*
13 * print a single line returned from xdiff
14 */
15static void print_line(char *line, int len)
16{
17	char *class = "ctx";
18	char c = line[len-1];
19
20	if (line[0] == '+')
21		class = "add";
22	else if (line[0] == '-')
23		class = "del";
24	else if (line[0] == '@')
25		class = "hunk";
26
27	htmlf("<div class='%s'>", class);
28	line[len-1] = '\0';
29	html_txt(line);
30	html("</div>");
31	line[len-1] = c;
32}
33
34static void filepair_cb(struct diff_filepair *pair)
35{
36	html("<tr><th>");
37	html_txt(pair->two->path);
38	html("</th></tr>");
39	html("<tr><td>");
40	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
41		cgit_print_error("Error running diff");
42	html("</tr></td>");
43}
44
45void cgit_print_diff(const char *old_hex, const char *new_hex, char *path)
46{
47	unsigned char sha1[20], sha2[20];
48	enum object_type type;
49	unsigned long size;
50
51	get_sha1(old_hex, sha1);
52	get_sha1(new_hex, sha2);
53
54	type = sha1_object_info(sha1, &size);
55	if (type == OBJ_BAD) {
56		type = sha1_object_info(sha2, &size);
57		if (type == OBJ_BAD) {
58			cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
59			return;
60		}
61	}
62
63	html("<table class='diff'>");
64	switch(type) {
65	case OBJ_BLOB:
66		if (path)
67			htmlf("<tr><th>%s</th></tr>", path);
68		html("<tr><td>");
69		if (cgit_diff_files(sha1, sha2, print_line))
70			cgit_print_error("Error running diff");
71		html("</tr></td>");
72		break;
73	case OBJ_TREE:
74		cgit_diff_tree(sha1, sha2, filepair_cb);
75		break;
76	default:
77		cgit_print_error(fmt("Unhandled object type: %s",
78				     typename(type)));
79		break;
80	}
81	html("</td></tr></table>");
82}