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 "ui-patch.h"
 11#include "html.h"
 12#include "ui-shared.h"
 13
 14static void print_line(char *line, int len)
 15{
 16	char c = line[len-1];
 17
 18	line[len-1] = '\0';
 19	htmlf("%s\n", line);
 20	line[len-1] = c;
 21}
 22
 23static void header(unsigned char *sha1, char *path1, int mode1,
 24		   unsigned char *sha2, char *path2, int mode2)
 25{
 26	char *abbrev1, *abbrev2;
 27	int subproject;
 28
 29	subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 30	htmlf("diff --git a/%s b/%s\n", path1, path2);
 31
 32	if (mode1 == 0)
 33		htmlf("new file mode %.6o\n", mode2);
 34
 35	if (mode2 == 0)
 36		htmlf("deleted file mode %.6o\n", mode1);
 37
 38	if (!subproject) {
 39		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 40		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 41		htmlf("index %s..%s", abbrev1, abbrev2);
 42		free(abbrev1);
 43		free(abbrev2);
 44		if (mode1 != 0 && mode2 != 0) {
 45			htmlf(" %.6o", mode1);
 46			if (mode2 != mode1)
 47				htmlf("..%.6o", mode2);
 48		}
 49
 50		if (is_null_sha1(sha1)) {
 51			path1 = "dev/null";
 52			htmlf("\n--- /%s\n", path1);
 53		} else
 54			htmlf("\n--- a/%s\n", path1);
 55
 56		if (is_null_sha1(sha2)) {
 57			path2 = "dev/null";
 58			htmlf("+++ /%s\n", path2);
 59		} else
 60			htmlf("+++ b/%s\n", path2);
 61	}
 62}
 63
 64static void filepair_cb(struct diff_filepair *pair)
 65{
 66	unsigned long old_size = 0;
 67	unsigned long new_size = 0;
 68	int binary = 0;
 69
 70	header(pair->one->sha1, pair->one->path, pair->one->mode,
 71	       pair->two->sha1, pair->two->path, pair->two->mode);
 72	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 73		if (S_ISGITLINK(pair->one->mode))
 74			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 75		if (S_ISGITLINK(pair->two->mode))
 76			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 77		return;
 78	}
 79	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 80			    &new_size, &binary, 0, 0, print_line))
 81		html("Error running diff");
 82	if (binary)
 83		html("Binary files differ\n");
 84}
 85
 86void cgit_print_patch(char *hex, const char *prefix)
 87{
 88	struct commit *commit;
 89	struct commitinfo *info;
 90	unsigned char sha1[20], old_sha1[20];
 91	char *patchname;
 92
 93	if (!hex)
 94		hex = ctx.qry.head;
 95
 96	if (get_sha1(hex, sha1)) {
 97		cgit_print_error("Bad object id: %s", hex);
 98		return;
 99	}
100	commit = lookup_commit_reference(sha1);
101	if (!commit) {
102		cgit_print_error("Bad commit reference: %s", hex);
103		return;
104	}
105	info = cgit_parse_commit(commit);
106
107	if (commit->parents && commit->parents->item)
108		hashcpy(old_sha1, commit->parents->item->object.sha1);
109	else
110		hashclr(old_sha1);
111
112	patchname = fmt("%s.patch", sha1_to_hex(sha1));
113	ctx.page.mimetype = "text/plain";
114	ctx.page.filename = patchname;
115	cgit_print_http_headers(&ctx);
116	htmlf("From %s Mon Sep 17 00:00:00 2001\n", sha1_to_hex(sha1));
117	htmlf("From: %s", info->author);
118	if (!ctx.cfg.noplainemail) {
119		htmlf(" %s", info->author_email);
120	}
121	html("\n");
122	html("Date: ");
123	cgit_print_date(info->author_date, "%a, %d %b %Y %H:%M:%S %z%n", ctx.cfg.local_time);
124	htmlf("Subject: %s\n\n", info->subject);
125	if (info->msg && *info->msg) {
126		htmlf("%s", info->msg);
127		if (info->msg[strlen(info->msg) - 1] != '\n')
128			html("\n");
129	}
130	html("---\n");
131	if (prefix)
132		htmlf("(limited to '%s')\n\n", prefix);
133	cgit_diff_tree(old_sha1, sha1, filepair_cb, prefix, 0);
134	html("--\n");
135	htmlf("cgit %s\n", cgit_version);
136	cgit_free_commitinfo(info);
137}