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
 11static void print_line(char *line, int len)
 12{
 13	char c = line[len-1];
 14
 15	line[len-1] = '\0';
 16	htmlf("%s\n", line);
 17	line[len-1] = c;
 18}
 19
 20static void header(unsigned char *sha1, char *path1, int mode1,
 21		   unsigned char *sha2, char *path2, int mode2)
 22{
 23	char *abbrev1, *abbrev2;
 24	int subproject;
 25
 26	subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 27	htmlf("diff --git a/%s b/%s\n", path1, path2);
 28
 29	if (is_null_sha1(sha1))
 30		path1 = "dev/null";
 31	if (is_null_sha1(sha2))
 32		path2 = "dev/null";
 33
 34	if (mode1 == 0)
 35		htmlf("new file mode %.6o\n", mode2);
 36
 37	if (mode2 == 0)
 38		htmlf("deleted file mode %.6o\n", mode1);
 39
 40	if (!subproject) {
 41		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 42		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 43		htmlf("index %s..%s", abbrev1, abbrev2);
 44		free(abbrev1);
 45		free(abbrev2);
 46		if (mode1 != 0 && mode2 != 0) {
 47			htmlf(" %.6o", mode1);
 48			if (mode2 != mode1)
 49				htmlf("..%.6o", mode2);
 50		}
 51		htmlf("\n--- a/%s\n", path1);
 52		htmlf("+++ b/%s\n", path2);
 53	}
 54}
 55
 56static void filepair_cb(struct diff_filepair *pair)
 57{
 58	header(pair->one->sha1, pair->one->path, pair->one->mode,
 59	       pair->two->sha1, pair->two->path, pair->two->mode);
 60	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 61		if (S_ISGITLINK(pair->one->mode))
 62			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 63		if (S_ISGITLINK(pair->two->mode))
 64			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 65		return;
 66	}
 67	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 68		html("Error running diff");
 69}
 70
 71void cgit_print_patch(char *hex, struct cacheitem *item)
 72{
 73	struct commit *commit;
 74	struct commitinfo *info;
 75	unsigned char sha1[20], old_sha1[20];
 76	char *patchname;
 77
 78	if (!hex)
 79		hex = cgit_query_head;
 80
 81	if (get_sha1(hex, sha1)) {
 82		cgit_print_error(fmt("Bad object id: %s", hex));
 83		return;
 84	}
 85	commit = lookup_commit_reference(sha1);
 86	if (!commit) {
 87		cgit_print_error(fmt("Bad commit reference: %s", hex));
 88		return;
 89	}
 90	info = cgit_parse_commit(commit);
 91	hashcpy(old_sha1, commit->parents->item->object.sha1);
 92
 93	patchname = fmt("%s.patch", sha1_to_hex(sha1));
 94	cgit_print_snapshot_start("text/plain", patchname, item);
 95	htmlf("From %s Mon Sep 17 00:00:00 2001\n", sha1_to_hex(sha1));
 96	htmlf("From: %s%s\n", info->author, info->author_email);
 97	html("Date: ");
 98	cgit_print_date(info->author_date, "%a, %d  %b  %Y  %H:%M:%S  %z%n");
 99	htmlf("Subject: %s\n\n", info->subject);
100	if (info->msg && *info->msg) {
101		htmlf("%s", info->msg);
102		if (info->msg[strlen(info->msg) - 1] != '\n')
103			html("\n");
104	}
105	html("---\n");
106	cgit_diff_tree(old_sha1, sha1, filepair_cb, NULL);
107	html("--\n");
108	htmlf("cgit %s\n", CGIT_VERSION);
109	cgit_free_commitinfo(info);
110}