1/* ui-patch.c: generate patch view
  2 *
  3 * Copyright (C) 2007 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#include "html.h"
 11#include "ui-shared.h"
 12
 13static void print_line(char *line, int len)
 14{
 15	char c = line[len-1];
 16
 17	line[len-1] = '\0';
 18	htmlf("%s\n", line);
 19	line[len-1] = c;
 20}
 21
 22static void header(unsigned char *sha1, char *path1, int mode1,
 23		   unsigned char *sha2, char *path2, int mode2)
 24{
 25	char *abbrev1, *abbrev2;
 26	int subproject;
 27
 28	subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 29	htmlf("diff --git a/%s b/%s\n", path1, path2);
 30
 31	if (mode1 == 0)
 32		htmlf("new file mode %.6o\n", mode2);
 33
 34	if (mode2 == 0)
 35		htmlf("deleted file mode %.6o\n", mode1);
 36
 37	if (!subproject) {
 38		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 39		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 40		htmlf("index %s..%s", abbrev1, abbrev2);
 41		free(abbrev1);
 42		free(abbrev2);
 43		if (mode1 != 0 && mode2 != 0) {
 44			htmlf(" %.6o", mode1);
 45			if (mode2 != mode1)
 46				htmlf("..%.6o", mode2);
 47		}
 48
 49		if (is_null_sha1(sha1)) {
 50			path1 = "dev/null";
 51			htmlf("\n--- /%s\n", path1);
 52		} else
 53			htmlf("\n--- a/%s\n", path1);
 54
 55		if (is_null_sha1(sha2)) {
 56			path2 = "dev/null";
 57			htmlf("+++ /%s\n", path2);
 58		} else
 59			htmlf("+++ b/%s\n", path2);
 60	}
 61}
 62
 63static void filepair_cb(struct diff_filepair *pair)
 64{
 65	unsigned long old_size = 0;
 66	unsigned long new_size = 0;
 67	int binary = 0;
 68
 69	header(pair->one->sha1, pair->one->path, pair->one->mode,
 70	       pair->two->sha1, pair->two->path, pair->two->mode);
 71	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 72		if (S_ISGITLINK(pair->one->mode))
 73			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 74		if (S_ISGITLINK(pair->two->mode))
 75			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 76		return;
 77	}
 78	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 79			    &new_size, &binary, 0, 0, print_line))
 80		html("Error running diff");
 81	if (binary)
 82		html("Binary files differ\n");
 83}
 84
 85void cgit_print_patch(char *hex, const char *prefix)
 86{
 87	struct commit *commit;
 88	struct commitinfo *info;
 89	unsigned char sha1[20], old_sha1[20];
 90	char *patchname;
 91
 92	if (!hex)
 93		hex = ctx.qry.head;
 94
 95	if (get_sha1(hex, sha1)) {
 96		cgit_print_error(fmt("Bad object id: %s", hex));
 97		return;
 98	}
 99	commit = lookup_commit_reference(sha1);
100	if (!commit) {
101		cgit_print_error(fmt("Bad commit reference: %s", hex));
102		return;
103	}
104	info = cgit_parse_commit(commit);
105
106	if (commit->parents && commit->parents->item)
107		hashcpy(old_sha1, commit->parents->item->object.sha1);
108	else
109		hashclr(old_sha1);
110
111	patchname = fmt("%s.patch", sha1_to_hex(sha1));
112	ctx.page.mimetype = "text/plain";
113	ctx.page.filename = patchname;
114	cgit_print_http_headers(&ctx);
115	htmlf("From %s Mon Sep 17 00:00:00 2001\n", sha1_to_hex(sha1));
116	htmlf("From: %s", info->author);
117	if (!ctx.cfg.noplainemail) {
118		htmlf(" %s", info->author_email);
119	}
120	html("\n");
121	html("Date: ");
122	cgit_print_date(info->author_date, "%a, %d %b %Y %H:%M:%S %z%n", ctx.cfg.local_time);
123	htmlf("Subject: %s\n\n", info->subject);
124	if (info->msg && *info->msg) {
125		htmlf("%s", info->msg);
126		if (info->msg[strlen(info->msg) - 1] != '\n')
127			html("\n");
128	}
129	html("---\n");
130	if (prefix)
131		htmlf("(limited to '%s')\n\n", prefix);
132	cgit_diff_tree(old_sha1, sha1, filepair_cb, prefix, 0);
133	html("--\n");
134	htmlf("cgit %s\n", cgit_version);
135	cgit_free_commitinfo(info);
136}