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