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#include "html.h"
 11#include "ui-shared.h"
 12
 13unsigned char old_rev_sha1[20];
 14unsigned char new_rev_sha1[20];
 15
 16static int files, slots;
 17static int total_adds, total_rems, max_changes;
 18static int lines_added, lines_removed;
 19
 20static struct fileinfo {
 21	char status;
 22	unsigned char old_sha1[20];
 23	unsigned char new_sha1[20];
 24	unsigned short old_mode;
 25	unsigned short new_mode;
 26	char *old_path;
 27	char *new_path;
 28	unsigned int added;
 29	unsigned int removed;
 30} *items;
 31
 32
 33static void print_fileinfo(struct fileinfo *info)
 34{
 35	char *class;
 36
 37	switch (info->status) {
 38	case DIFF_STATUS_ADDED:
 39		class = "add";
 40		break;
 41	case DIFF_STATUS_COPIED:
 42		class = "cpy";
 43		break;
 44	case DIFF_STATUS_DELETED:
 45		class = "del";
 46		break;
 47	case DIFF_STATUS_MODIFIED:
 48		class = "upd";
 49		break;
 50	case DIFF_STATUS_RENAMED:
 51		class = "mov";
 52		break;
 53	case DIFF_STATUS_TYPE_CHANGED:
 54		class = "typ";
 55		break;
 56	case DIFF_STATUS_UNKNOWN:
 57		class = "unk";
 58		break;
 59	case DIFF_STATUS_UNMERGED:
 60		class = "stg";
 61		break;
 62	default:
 63		die("bug: unhandled diff status %c", info->status);
 64	}
 65
 66	html("<tr>");
 67	htmlf("<td class='mode'>");
 68	if (is_null_sha1(info->new_sha1)) {
 69		cgit_print_filemode(info->old_mode);
 70	} else {
 71		cgit_print_filemode(info->new_mode);
 72	}
 73
 74	if (info->old_mode != info->new_mode &&
 75	    !is_null_sha1(info->old_sha1) &&
 76	    !is_null_sha1(info->new_sha1)) {
 77		html("<span class='modechange'>[");
 78		cgit_print_filemode(info->old_mode);
 79		html("]</span>");
 80	}
 81	htmlf("</td><td class='%s'>", class);
 82	cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.sha1,
 83		       ctx.qry.sha2, info->new_path);
 84	if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
 85		htmlf(" (%s from %s)",
 86		      info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
 87		      info->old_path);
 88	html("</td><td class='right'>");
 89	htmlf("%d", info->added + info->removed);
 90	html("</td><td class='graph'>");
 91	htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 92	htmlf("<td class='add' style='width: %.1f%%;'/>",
 93	      info->added * 100.0 / max_changes);
 94	htmlf("<td class='rem' style='width: %.1f%%;'/>",
 95	      info->removed * 100.0 / max_changes);
 96	htmlf("<td class='none' style='width: %.1f%%;'/>",
 97	      (max_changes - info->removed - info->added) * 100.0 / max_changes);
 98	html("</tr></table></td></tr>\n");
 99}
100
101static void count_diff_lines(char *line, int len)
102{
103	if (line && (len > 0)) {
104		if (line[0] == '+')
105			lines_added++;
106		else if (line[0] == '-')
107			lines_removed++;
108	}
109}
110
111static void inspect_filepair(struct diff_filepair *pair)
112{
113	files++;
114	lines_added = 0;
115	lines_removed = 0;
116	cgit_diff_files(pair->one->sha1, pair->two->sha1, count_diff_lines);
117	if (files >= slots) {
118		if (slots == 0)
119			slots = 4;
120		else
121			slots = slots * 2;
122		items = xrealloc(items, slots * sizeof(struct fileinfo));
123	}
124	items[files-1].status = pair->status;
125	hashcpy(items[files-1].old_sha1, pair->one->sha1);
126	hashcpy(items[files-1].new_sha1, pair->two->sha1);
127	items[files-1].old_mode = pair->one->mode;
128	items[files-1].new_mode = pair->two->mode;
129	items[files-1].old_path = xstrdup(pair->one->path);
130	items[files-1].new_path = xstrdup(pair->two->path);
131	items[files-1].added = lines_added;
132	items[files-1].removed = lines_removed;
133	if (lines_added + lines_removed > max_changes)
134		max_changes = lines_added + lines_removed;
135	total_adds += lines_added;
136	total_rems += lines_removed;
137}
138
139void cgit_print_diffstat(const unsigned char *old_sha1,
140			 const unsigned char *new_sha1)
141{
142	int i;
143
144	html("<div class='diffstat-header'>Diffstat</div>");
145	html("<table summary='diffstat' class='diffstat'>");
146	max_changes = 0;
147	cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, NULL);
148	for(i = 0; i<files; i++)
149		print_fileinfo(&items[i]);
150	html("</table>");
151	html("<div class='diffstat-summary'>");
152	htmlf("%d files changed, %d insertions, %d deletions",
153	      files, total_adds, total_rems);
154	html("</div>");
155}
156
157
158/*
159 * print a single line returned from xdiff
160 */
161static void print_line(char *line, int len)
162{
163	char *class = "ctx";
164	char c = line[len-1];
165
166	if (line[0] == '+')
167		class = "add";
168	else if (line[0] == '-')
169		class = "del";
170	else if (line[0] == '@')
171		class = "hunk";
172
173	htmlf("<div class='%s'>", class);
174	line[len-1] = '\0';
175	html_txt(line);
176	html("</div>");
177	line[len-1] = c;
178}
179
180static void header(unsigned char *sha1, char *path1, int mode1,
181		   unsigned char *sha2, char *path2, int mode2)
182{
183	char *abbrev1, *abbrev2;
184	int subproject;
185
186	subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
187	html("<div class='head'>");
188	html("diff --git a/");
189	html_txt(path1);
190	html(" b/");
191	html_txt(path2);
192
193	if (is_null_sha1(sha1))
194		path1 = "dev/null";
195	if (is_null_sha1(sha2))
196		path2 = "dev/null";
197
198	if (mode1 == 0)
199		htmlf("<br/>new file mode %.6o", mode2);
200
201	if (mode2 == 0)
202		htmlf("<br/>deleted file mode %.6o", mode1);
203
204	if (!subproject) {
205		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
206		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
207		htmlf("<br/>index %s..%s", abbrev1, abbrev2);
208		free(abbrev1);
209		free(abbrev2);
210		if (mode1 != 0 && mode2 != 0) {
211			htmlf(" %.6o", mode1);
212			if (mode2 != mode1)
213				htmlf("..%.6o", mode2);
214		}
215		html("<br/>--- a/");
216		if (mode1 != 0)
217			cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
218				       sha1_to_hex(old_rev_sha1), path1);
219		else
220			html_txt(path1);
221		html("<br/>+++ b/");
222		if (mode2 != 0)
223			cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
224				       sha1_to_hex(new_rev_sha1), path2);
225		else
226			html_txt(path2);
227	}
228	html("</div>");
229}
230
231static void filepair_cb(struct diff_filepair *pair)
232{
233	header(pair->one->sha1, pair->one->path, pair->one->mode,
234	       pair->two->sha1, pair->two->path, pair->two->mode);
235	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
236		if (S_ISGITLINK(pair->one->mode))
237			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
238		if (S_ISGITLINK(pair->two->mode))
239			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
240		return;
241	}
242	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
243		cgit_print_error("Error running diff");
244}
245
246void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
247{
248	enum object_type type;
249	unsigned long size;
250	struct commit *commit, *commit2;
251
252	if (!new_rev)
253		new_rev = ctx.qry.head;
254	get_sha1(new_rev, new_rev_sha1);
255	type = sha1_object_info(new_rev_sha1, &size);
256	if (type == OBJ_BAD) {
257		cgit_print_error(fmt("Bad object name: %s", new_rev));
258		return;
259	}
260	commit = lookup_commit_reference(new_rev_sha1);
261	if (!commit || parse_commit(commit))
262		cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
263
264	if (old_rev)
265		get_sha1(old_rev, old_rev_sha1);
266	else if (commit->parents && commit->parents->item)
267		hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
268	else
269		hashclr(old_rev_sha1);
270
271	if (!is_null_sha1(old_rev_sha1)) {
272		type = sha1_object_info(old_rev_sha1, &size);
273		if (type == OBJ_BAD) {
274			cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
275			return;
276		}
277		commit2 = lookup_commit_reference(old_rev_sha1);
278		if (!commit2 || parse_commit(commit2))
279			cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
280	}
281	cgit_print_diffstat(old_rev_sha1, new_rev_sha1);
282
283	html("<table summary='diff' class='diff'>");
284	html("<tr><td>");
285	cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
286	html("</td></tr>");
287	html("</table>");
288}