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 header(unsigned char *sha1, char *path1,
 35		   unsigned char *sha2, char *path2)
 36{
 37	char *abbrev1, *abbrev2;
 38	if (is_null_sha1(sha1))
 39		path1 = "dev/null";
 40	if (is_null_sha1(sha2))
 41		path2 = "dev/null";
 42	html("<tr><td>");
 43	html("<div class='head'>");
 44	html("diff --git a/");
 45	html_txt(path1);
 46	html(" b/");
 47	html_txt(path2);
 48	abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 49	abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 50	htmlf("\nindex %s..%s", abbrev1, abbrev2);
 51	free(abbrev1);
 52	free(abbrev2);
 53	html("\n--- a/");
 54	html_txt(path1);
 55	html("\n+++ b/");
 56	html_txt(path2);
 57	html("</div>");
 58}
 59
 60static void filepair_cb(struct diff_filepair *pair)
 61{
 62	header(pair->one->sha1, pair->one->path,
 63	       pair->two->sha1, pair->two->path);
 64	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 65		cgit_print_error("Error running diff");
 66	html("</tr></td>");
 67}
 68
 69void cgit_print_diff(const char *old_hex, const char *new_hex, char *path)
 70{
 71	unsigned char sha1[20], sha2[20];
 72	enum object_type type;
 73	unsigned long size;
 74
 75	get_sha1(old_hex, sha1);
 76	get_sha1(new_hex, sha2);
 77
 78	type = sha1_object_info(sha1, &size);
 79	if (type == OBJ_BAD) {
 80		type = sha1_object_info(sha2, &size);
 81		if (type == OBJ_BAD) {
 82			cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
 83			return;
 84		}
 85	}
 86
 87	html("<table class='diff'>");
 88	switch(type) {
 89	case OBJ_BLOB:
 90		html("<tr><td>");
 91		header(sha1, path, sha2, path);
 92		if (cgit_diff_files(sha1, sha2, print_line))
 93			cgit_print_error("Error running diff");
 94		html("</tr></td>");
 95		break;
 96	case OBJ_TREE:
 97		cgit_diff_tree(sha1, sha2, filepair_cb);
 98		break;
 99	default:
100		cgit_print_error(fmt("Unhandled object type: %s",
101				     typename(type)));
102		break;
103	}
104	html("</td></tr></table>");
105}