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;
 19static char *curr_rev;
 20
 21static struct fileinfo {
 22	char status;
 23	unsigned char old_sha1[20];
 24	unsigned char new_sha1[20];
 25	unsigned short old_mode;
 26	unsigned short new_mode;
 27	char *old_path;
 28	char *new_path;
 29	unsigned int added;
 30	unsigned int removed;
 31} *items;
 32
 33
 34static void print_fileinfo(struct fileinfo *info)
 35{
 36	char *class;
 37
 38	switch (info->status) {
 39	case DIFF_STATUS_ADDED:
 40		class = "add";
 41		break;
 42	case DIFF_STATUS_COPIED:
 43		class = "cpy";
 44		break;
 45	case DIFF_STATUS_DELETED:
 46		class = "del";
 47		break;
 48	case DIFF_STATUS_MODIFIED:
 49		class = "upd";
 50		break;
 51	case DIFF_STATUS_RENAMED:
 52		class = "mov";
 53		break;
 54	case DIFF_STATUS_TYPE_CHANGED:
 55		class = "typ";
 56		break;
 57	case DIFF_STATUS_UNKNOWN:
 58		class = "unk";
 59		break;
 60	case DIFF_STATUS_UNMERGED:
 61		class = "stg";
 62		break;
 63	default:
 64		die("bug: unhandled diff status %c", info->status);
 65	}
 66
 67	html("<tr>");
 68	htmlf("<td class='mode'>");
 69	if (is_null_sha1(info->new_sha1)) {
 70		cgit_print_filemode(info->old_mode);
 71	} else {
 72		cgit_print_filemode(info->new_mode);
 73	}
 74
 75	if (info->old_mode != info->new_mode &&
 76	    !is_null_sha1(info->old_sha1) &&
 77	    !is_null_sha1(info->new_sha1)) {
 78		html("<span class='modechange'>[");
 79		cgit_print_filemode(info->old_mode);
 80		html("]</span>");
 81	}
 82	htmlf("</td><td class='%s'>", class);
 83	cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, curr_rev,
 84		       NULL, info->new_path);
 85	if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
 86		htmlf(" (%s from %s)",
 87		      info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
 88		      info->old_path);
 89	html("</td><td class='right'>");
 90	htmlf("%d", info->added + info->removed);
 91	html("</td><td class='graph'>");
 92	htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 93	htmlf("<td class='add' style='width: %.1f%%;'/>",
 94	      info->added * 100.0 / max_changes);
 95	htmlf("<td class='rem' style='width: %.1f%%;'/>",
 96	      info->removed * 100.0 / max_changes);
 97	htmlf("<td class='none' style='width: %.1f%%;'/>",
 98	      (max_changes - info->removed - info->added) * 100.0 / max_changes);
 99	html("</tr></table></td></tr>\n");
100}
101
102static void count_diff_lines(char *line, int len)
103{
104	if (line && (len > 0)) {
105		if (line[0] == '+')
106			lines_added++;
107		else if (line[0] == '-')
108			lines_removed++;
109	}
110}
111
112static void inspect_filepair(struct diff_filepair *pair)
113{
114	files++;
115	lines_added = 0;
116	lines_removed = 0;
117	cgit_diff_files(pair->one->sha1, pair->two->sha1, count_diff_lines);
118	if (files >= slots) {
119		if (slots == 0)
120			slots = 4;
121		else
122			slots = slots * 2;
123		items = xrealloc(items, slots * sizeof(struct fileinfo));
124	}
125	items[files-1].status = pair->status;
126	hashcpy(items[files-1].old_sha1, pair->one->sha1);
127	hashcpy(items[files-1].new_sha1, pair->two->sha1);
128	items[files-1].old_mode = pair->one->mode;
129	items[files-1].new_mode = pair->two->mode;
130	items[files-1].old_path = xstrdup(pair->one->path);
131	items[files-1].new_path = xstrdup(pair->two->path);
132	items[files-1].added = lines_added;
133	items[files-1].removed = lines_removed;
134	if (lines_added + lines_removed > max_changes)
135		max_changes = lines_added + lines_removed;
136	total_adds += lines_added;
137	total_rems += lines_removed;
138}
139
140void cgit_print_diffstat(const unsigned char *old_sha1,
141			 const unsigned char *new_sha1)
142{
143	int i;
144
145	html("<div class='diffstat-header'>Diffstat</div>");
146	html("<table summary='diffstat' class='diffstat'>");
147	max_changes = 0;
148	curr_rev = xstrdup(sha1_to_hex(new_sha1));
149	cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, NULL);
150	for(i = 0; i<files; i++)
151		print_fileinfo(&items[i]);
152	html("</table>");
153	html("<div class='diffstat-summary'>");
154	htmlf("%d files changed, %d insertions, %d deletions",
155	      files, total_adds, total_rems);
156	html("</div>");
157}
158
159
160/*
161 * print a single line returned from xdiff
162 */
163static void print_line(char *line, int len)
164{
165	char *class = "ctx";
166	char c = line[len-1];
167
168	if (line[0] == '+')
169		class = "add";
170	else if (line[0] == '-')
171		class = "del";
172	else if (line[0] == '@')
173		class = "hunk";
174
175	htmlf("<div class='%s'>", class);
176	line[len-1] = '\0';
177	html_txt(line);
178	html("</div>");
179	line[len-1] = c;
180}
181
182static void header(unsigned char *sha1, char *path1, int mode1,
183		   unsigned char *sha2, char *path2, int mode2)
184{
185	char *abbrev1, *abbrev2;
186	int subproject;
187
188	subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
189	html("<div class='head'>");
190	html("diff --git a/");
191	html_txt(path1);
192	html(" b/");
193	html_txt(path2);
194
195	if (is_null_sha1(sha1))
196		path1 = "dev/null";
197	if (is_null_sha1(sha2))
198		path2 = "dev/null";
199
200	if (mode1 == 0)
201		htmlf("<br/>new file mode %.6o", mode2);
202
203	if (mode2 == 0)
204		htmlf("<br/>deleted file mode %.6o", mode1);
205
206	if (!subproject) {
207		abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
208		abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
209		htmlf("<br/>index %s..%s", abbrev1, abbrev2);
210		free(abbrev1);
211		free(abbrev2);
212		if (mode1 != 0 && mode2 != 0) {
213			htmlf(" %.6o", mode1);
214			if (mode2 != mode1)
215				htmlf("..%.6o", mode2);
216		}
217		html("<br/>--- a/");
218		if (mode1 != 0)
219			cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
220				       sha1_to_hex(old_rev_sha1), path1);
221		else
222			html_txt(path1);
223		html("<br/>+++ b/");
224		if (mode2 != 0)
225			cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
226				       sha1_to_hex(new_rev_sha1), path2);
227		else
228			html_txt(path2);
229	}
230	html("</div>");
231}
232
233static void filepair_cb(struct diff_filepair *pair)
234{
235	header(pair->one->sha1, pair->one->path, pair->one->mode,
236	       pair->two->sha1, pair->two->path, pair->two->mode);
237	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
238		if (S_ISGITLINK(pair->one->mode))
239			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
240		if (S_ISGITLINK(pair->two->mode))
241			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
242		return;
243	}
244	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
245		cgit_print_error("Error running diff");
246}
247
248void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
249{
250	enum object_type type;
251	unsigned long size;
252	struct commit *commit, *commit2;
253
254	if (!new_rev)
255		new_rev = ctx.qry.head;
256	get_sha1(new_rev, new_rev_sha1);
257	type = sha1_object_info(new_rev_sha1, &size);
258	if (type == OBJ_BAD) {
259		cgit_print_error(fmt("Bad object name: %s", new_rev));
260		return;
261	}
262	commit = lookup_commit_reference(new_rev_sha1);
263	if (!commit || parse_commit(commit))
264		cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
265
266	if (old_rev)
267		get_sha1(old_rev, old_rev_sha1);
268	else if (commit->parents && commit->parents->item)
269		hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
270	else
271		hashclr(old_rev_sha1);
272
273	if (!is_null_sha1(old_rev_sha1)) {
274		type = sha1_object_info(old_rev_sha1, &size);
275		if (type == OBJ_BAD) {
276			cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
277			return;
278		}
279		commit2 = lookup_commit_reference(old_rev_sha1);
280		if (!commit2 || parse_commit(commit2))
281			cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
282	}
283	cgit_print_diffstat(old_rev_sha1, new_rev_sha1);
284
285	html("<table summary='diff' class='diff'>");
286	html("<tr><td>");
287	cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
288	html("</td></tr>");
289	html("</table>");
290}