ui-diff.c

   1 /* ui-diff.c: show diff between two blobs
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   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-diff.h"
  11 #include "html.h"
  12 #include "ui-shared.h"
  13 #include "ui-ssdiff.h"
  14
  15 struct object_id old_rev_oid[1];
  16 struct object_id new_rev_oid[1];
  17
  18 static int files, slots;
  19 static int total_adds, total_rems, max_changes;
  20 static int lines_added, lines_removed;
  21
  22 static struct fileinfo {
  23         char status;
  24         struct object_id old_oid[1];
  25         struct object_id new_oid[1];
  26         unsigned short old_mode;
  27         unsigned short new_mode;
  28         char *old_path;
  29         char *new_path;
  30         unsigned int added;
  31         unsigned int removed;
  32         unsigned long old_size;
  33         unsigned long new_size;
  34         unsigned int binary:1;
  35 } *items;
  36
  37 static int use_ssdiff = 0;
  38 static struct diff_filepair *current_filepair;
  39 static const char *current_prefix;
  40
  41 struct diff_filespec *cgit_get_current_old_file(void)
  42 {
  43         return current_filepair->one;
  44 }
  45
  46 struct diff_filespec *cgit_get_current_new_file(void)
  47 {
  48         return current_filepair->two;
  49 }
  50
  51 static void print_fileinfo(struct fileinfo *info)
  52 {
  53         char *class;
  54
  55         switch (info->status) {
  56         case DIFF_STATUS_ADDED:
  57                 class = "add";
  58                 break;
  59         case DIFF_STATUS_COPIED:
  60                 class = "cpy";
  61                 break;
  62         case DIFF_STATUS_DELETED:
  63                 class = "del";
  64                 break;
  65         case DIFF_STATUS_MODIFIED:
  66                 class = "upd";
  67                 break;
  68         case DIFF_STATUS_RENAMED:
  69                 class = "mov";
  70                 break;
  71         case DIFF_STATUS_TYPE_CHANGED:
  72                 class = "typ";
  73                 break;
  74         case DIFF_STATUS_UNKNOWN:
  75                 class = "unk";
  76                 break;
  77         case DIFF_STATUS_UNMERGED:
  78                 class = "stg";
  79                 break;
  80         default:
  81                 die("bug: unhandled diff status %c", info->status);
  82         }
  83
  84         html("<tr>");
  85         html("<td class='mode'>");
  86         if (is_null_oid(info->new_oid)) {
  87                 cgit_print_filemode(info->old_mode);
  88         } else {
  89                 cgit_print_filemode(info->new_mode);
  90         }
  91
  92         if (info->old_mode != info->new_mode &&
  93             !is_null_oid(info->old_oid) &&
  94             !is_null_oid(info->new_oid)) {
  95                 html("<span class='modechange'>[");
  96                 cgit_print_filemode(info->old_mode);
  97                 html("]</span>");
  98         }
  99         htmlf("</td><td class='%s'>", class);
 100         cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.oid,
 101                        ctx.qry.oid2, info->new_path);
 102         if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED) {
 103                 htmlf(" (%s from ",
 104                       info->status == DIFF_STATUS_COPIED ? "copied" : "renamed");
 105                 html_txt(info->old_path);
 106                 html(")");
 107         }
 108         html("</td><td class='right'>");
 109         if (info->binary) {
 110                 htmlf("bin</td><td class='graph'>%ld -> %ld bytes",
 111                       info->old_size, info->new_size);
 112                 return;
 113         }
 114         htmlf("%d", info->added + info->removed);
 115         html("</td><td class='graph'>");
 116         htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 117         htmlf("<td class='add' style='width: %.1f%%;'/>",
 118               info->added * 100.0 / max_changes);
 119         htmlf("<td class='rem' style='width: %.1f%%;'/>",
 120               info->removed * 100.0 / max_changes);
 121         htmlf("<td class='none' style='width: %.1f%%;'/>",
 122               (max_changes - info->removed - info->added) * 100.0 / max_changes);
 123         html("</tr></table></td></tr>\n");
 124 }
 125
 126 static void count_diff_lines(char *line, int len)
 127 {
 128         if (line && (len > 0)) {
 129                 if (line[0] == '+')
 130                         lines_added++;
 131                 else if (line[0] == '-')
 132                         lines_removed++;
 133         }
 134 }
 135
 136 static int show_filepair(struct diff_filepair *pair)
 137 {
 138         /* Always show if we have no limiting prefix. */
 139         if (!current_prefix)
 140                 return 1;
 141
 142         /* Show if either path in the pair begins with the prefix. */
 143         if (starts_with(pair->one->path, current_prefix) ||
 144             starts_with(pair->two->path, current_prefix))
 145                 return 1;
 146
 147         /* Otherwise we don't want to show this filepair. */
 148         return 0;
 149 }
 150
 151 static void inspect_filepair(struct diff_filepair *pair)
 152 {
 153         int binary = 0;
 154         unsigned long old_size = 0;
 155         unsigned long new_size = 0;
 156
 157         if (!show_filepair(pair))
 158                 return;
 159
 160         files++;
 161         lines_added = 0;
 162         lines_removed = 0;
 163         cgit_diff_files(&pair->one->oid, &pair->two->oid, &old_size, &new_size,
 164                         &binary, 0, ctx.qry.ignorews, count_diff_lines);
 165         if (files >= slots) {
 166                 if (slots == 0)
 167                         slots = 4;
 168                 else
 169                         slots = slots * 2;
 170                 items = xrealloc(items, slots * sizeof(struct fileinfo));
 171         }
 172         items[files-1].status = pair->status;
 173         oidcpy(items[files-1].old_oid, &pair->one->oid);
 174         oidcpy(items[files-1].new_oid, &pair->two->oid);
 175         items[files-1].old_mode = pair->one->mode;
 176         items[files-1].new_mode = pair->two->mode;
 177         items[files-1].old_path = xstrdup(pair->one->path);
 178         items[files-1].new_path = xstrdup(pair->two->path);
 179         items[files-1].added = lines_added;
 180         items[files-1].removed = lines_removed;
 181         items[files-1].old_size = old_size;
 182         items[files-1].new_size = new_size;
 183         items[files-1].binary = binary;
 184         if (lines_added + lines_removed > max_changes)
 185                 max_changes = lines_added + lines_removed;
 186         total_adds += lines_added;
 187         total_rems += lines_removed;
 188 }
 189
 190 static void cgit_print_diffstat(const struct object_id *old_oid,
 191                                 const struct object_id *new_oid,
 192                                 const char *prefix)
 193 {
 194         int i;
 195
 196         html("<div class='diffstat-header'>");
 197         cgit_diff_link("Diffstat", NULL, NULL, ctx.qry.head, ctx.qry.oid,
 198                        ctx.qry.oid2, NULL);
 199         if (prefix) {
 200                 html(" (limited to '");
 201                 html_txt(prefix);
 202                 html("')");
 203         }
 204         html("</div>");
 205         html("<table summary='diffstat' class='diffstat'>");
 206         max_changes = 0;
 207         cgit_diff_tree(old_oid, new_oid, inspect_filepair, prefix,
 208                        ctx.qry.ignorews);
 209         for (i = 0; i<files; i++)
 210                 print_fileinfo(&items[i]);
 211         html("</table>");
 212         html("<div class='diffstat-summary'>");
 213         htmlf("%d files changed, %d insertions, %d deletions",
 214               files, total_adds, total_rems);
 215         html("</div>");
 216 }
 217
 218
 219 /*
 220  * print a single line returned from xdiff
 221  */
 222 static void print_line(char *line, int len)
 223 {
 224         char *class = "ctx";
 225         char c = line[len-1];
 226
 227         if (line[0] == '+')
 228                 class = "add";
 229         else if (line[0] == '-')
 230                 class = "del";
 231         else if (line[0] == '@')
 232                 class = "hunk";
 233
 234         htmlf("<div class='%s'>", class);
 235         line[len-1] = '\0';
 236         html_txt(line);
 237         html("</div>");
 238         line[len-1] = c;
 239 }
 240
 241 static void header(const struct object_id *oid1, char *path1, int mode1,
 242                    const struct object_id *oid2, char *path2, int mode2)
 243 {
 244         char *abbrev1, *abbrev2;
 245         int subproject;
 246
 247         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 248         html("<div class='head'>");
 249         html("diff --git a/");
 250         html_txt(path1);
 251         html(" b/");
 252         html_txt(path2);
 253
 254         if (mode1 == 0)
 255                 htmlf("<br/>new file mode %.6o", mode2);
 256
 257         if (mode2 == 0)
 258                 htmlf("<br/>deleted file mode %.6o", mode1);
 259
 260         if (!subproject) {
 261                 abbrev1 = xstrdup(find_unique_abbrev(oid1, DEFAULT_ABBREV));
 262                 abbrev2 = xstrdup(find_unique_abbrev(oid2, DEFAULT_ABBREV));
 263                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 264                 free(abbrev1);
 265                 free(abbrev2);
 266                 if (mode1 != 0 && mode2 != 0) {
 267                         htmlf(" %.6o", mode1);
 268                         if (mode2 != mode1)
 269                                 htmlf("..%.6o", mode2);
 270                 }
 271                 if (is_null_oid(oid1)) {
 272                         path1 = "dev/null";
 273                         html("<br/>--- /");
 274                 } else
 275                         html("<br/>--- a/");
 276                 if (mode1 != 0)
 277                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
 278                                        oid_to_hex(old_rev_oid), path1);
 279                 else
 280                         html_txt(path1);
 281                 if (is_null_oid(oid2)) {
 282                         path2 = "dev/null";
 283                         html("<br/>+++ /");
 284                 } else
 285                         html("<br/>+++ b/");
 286                 if (mode2 != 0)
 287                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
 288                                        oid_to_hex(new_rev_oid), path2);
 289                 else
 290                         html_txt(path2);
 291         }
 292         html("</div>");
 293 }
 294
 295 static void filepair_cb(struct diff_filepair *pair)
 296 {
 297         unsigned long old_size = 0;
 298         unsigned long new_size = 0;
 299         int binary = 0;
 300         linediff_fn print_line_fn = print_line;
 301
 302         if (!show_filepair(pair))
 303                 return;
 304
 305         current_filepair = pair;
 306         if (use_ssdiff) {
 307                 cgit_ssdiff_header_begin();
 308                 print_line_fn = cgit_ssdiff_line_cb;
 309         }
 310         header(&pair->one->oid, pair->one->path, pair->one->mode,
 311                &pair->two->oid, pair->two->path, pair->two->mode);
 312         if (use_ssdiff)
 313                 cgit_ssdiff_header_end();
 314         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 315                 if (S_ISGITLINK(pair->one->mode))
 316                         print_line_fn(fmt("-Subproject %s", oid_to_hex(&pair->one->oid)), 52);
 317                 if (S_ISGITLINK(pair->two->mode))
 318                         print_line_fn(fmt("+Subproject %s", oid_to_hex(&pair->two->oid)), 52);
 319                 if (use_ssdiff)
 320                         cgit_ssdiff_footer();
 321                 return;
 322         }
 323         if (cgit_diff_files(&pair->one->oid, &pair->two->oid, &old_size,
 324                             &new_size, &binary, ctx.qry.context,
 325                             ctx.qry.ignorews, print_line_fn))
 326                 cgit_print_error("Error running diff");
 327         if (binary) {
 328                 if (use_ssdiff)
 329                         html("<tr><td colspan='4'>Binary files differ</td></tr>");
 330                 else
 331                         html("Binary files differ");
 332         }
 333         if (use_ssdiff)
 334                 cgit_ssdiff_footer();
 335 }
 336
 337 void cgit_print_diff_ctrls(void)
 338 {
 339         int i, curr;
 340
 341         html("<div class='cgit-panel'>");
 342         html("<b>diff options</b>");
 343         html("<form method='get'>");
 344         cgit_add_hidden_formfields(1, 0, ctx.qry.page);
 345         html("<table>");
 346         html("<tr><td colspan='2'/></tr>");
 347         html("<tr>");
 348         html("<td class='label'>context:</td>");
 349         html("<td class='ctrl'>");
 350         html("<select name='context' onchange='this.form.submit();'>");
 351         curr = ctx.qry.context;
 352         if (!curr)
 353                 curr = 3;
 354         for (i = 1; i <= 10; i++)
 355                 html_intoption(i, fmt("%d", i), curr);
 356         for (i = 15; i <= 40; i += 5)
 357                 html_intoption(i, fmt("%d", i), curr);
 358         html("</select>");
 359         html("</td>");
 360         html("</tr><tr>");
 361         html("<td class='label'>space:</td>");
 362         html("<td class='ctrl'>");
 363         html("<select name='ignorews' onchange='this.form.submit();'>");
 364         html_intoption(0, "include", ctx.qry.ignorews);
 365         html_intoption(1, "ignore", ctx.qry.ignorews);
 366         html("</select>");
 367         html("</td>");
 368         html("</tr><tr>");
 369         html("<td class='label'>mode:</td>");
 370         html("<td class='ctrl'>");
 371         html("<select name='dt' onchange='this.form.submit();'>");
 372         curr = ctx.qry.has_difftype ? ctx.qry.difftype : ctx.cfg.difftype;
 373         html_intoption(0, "unified", curr);
 374         html_intoption(1, "ssdiff", curr);
 375         html_intoption(2, "stat only", curr);
 376         html("</select></td></tr>");
 377         html("<tr><td/><td class='ctrl'>");
 378         html("<noscript><input type='submit' value='reload'/></noscript>");
 379         html("</td></tr></table>");
 380         html("</form>");
 381         html("</div>");
 382 }
 383
 384 void cgit_print_diff(const char *new_rev, const char *old_rev,
 385                      const char *prefix, int show_ctrls, int raw)
 386 {
 387         struct commit *commit, *commit2;
 388         const struct object_id *old_tree_oid, *new_tree_oid;
 389         diff_type difftype;
 390
 391         /*
 392          * If "follow" is set then the diff machinery needs to examine the
 393          * entire commit to detect renames so we must limit the paths in our
 394          * own callbacks and not pass the prefix to the diff machinery.
 395          */
 396         if (ctx.qry.follow && ctx.cfg.enable_follow_links) {
 397                 current_prefix = prefix;
 398                 prefix = "";
 399         } else {
 400                 current_prefix = NULL;
 401         }
 402
 403         if (!new_rev)
 404                 new_rev = ctx.qry.head;
 405         if (get_oid(new_rev, new_rev_oid)) {
 406                 cgit_print_error_page(404, "Not found",
 407                         "Bad object name: %s", new_rev);
 408                 return;
 409         }
 410         commit = lookup_commit_reference(the_repository, new_rev_oid);
 411         if (!commit || parse_commit(commit)) {
 412                 cgit_print_error_page(404, "Not found",
 413                         "Bad commit: %s", oid_to_hex(new_rev_oid));
 414                 return;
 415         }
 416         new_tree_oid = get_commit_tree_oid(commit);
 417
 418         if (old_rev) {
 419                 if (get_oid(old_rev, old_rev_oid)) {
 420                         cgit_print_error_page(404, "Not found",
 421                                 "Bad object name: %s", old_rev);
 422                         return;
 423                 }
 424         } else if (commit->parents && commit->parents->item) {
 425                 oidcpy(old_rev_oid, &commit->parents->item->object.oid);
 426         } else {
 427                 oidclr(old_rev_oid);
 428         }
 429
 430         if (!is_null_oid(old_rev_oid)) {
 431                 commit2 = lookup_commit_reference(the_repository, old_rev_oid);
 432                 if (!commit2 || parse_commit(commit2)) {
 433                         cgit_print_error_page(404, "Not found",
 434                                 "Bad commit: %s", oid_to_hex(old_rev_oid));
 435                         return;
 436                 }
 437                 old_tree_oid = get_commit_tree_oid(commit2);
 438         } else {
 439                 old_tree_oid = NULL;
 440         }
 441
 442         if (raw) {
 443                 struct diff_options diffopt;
 444
 445                 diff_setup(&diffopt);
 446                 diffopt.output_format = DIFF_FORMAT_PATCH;
 447                 diffopt.flags.recursive = 1;
 448                 diff_setup_done(&diffopt);
 449
 450                 ctx.page.mimetype = "text/plain";
 451                 cgit_print_http_headers();
 452                 if (old_tree_oid) {
 453                         diff_tree_oid(old_tree_oid, new_tree_oid, "",
 454                                        &diffopt);
 455                 } else {
 456                         diff_root_tree_oid(new_tree_oid, "", &diffopt);
 457                 }
 458                 diffcore_std(&diffopt);
 459                 diff_flush(&diffopt);
 460
 461                 return;
 462         }
 463
 464         difftype = ctx.qry.has_difftype ? ctx.qry.difftype : ctx.cfg.difftype;
 465         use_ssdiff = difftype == DIFF_SSDIFF;
 466
 467         if (show_ctrls) {
 468                 cgit_print_layout_start();
 469                 cgit_print_diff_ctrls();
 470         }
 471
 472         /*
 473          * Clicking on a link to a file in the diff stat should show a diff
 474          * of the file, showing the diff stat limited to a single file is
 475          * pretty useless.  All links from this point on will be to
 476          * individual files, so we simply reset the difftype in the query
 477          * here to avoid propagating DIFF_STATONLY to the individual files.
 478          */
 479         if (difftype == DIFF_STATONLY)
 480                 ctx.qry.difftype = ctx.cfg.difftype;
 481
 482         cgit_print_diffstat(old_rev_oid, new_rev_oid, prefix);
 483
 484         if (difftype == DIFF_STATONLY)
 485                 return;
 486
 487         if (use_ssdiff) {
 488                 html("<table summary='ssdiff' class='ssdiff'>");
 489         } else {
 490                 html("<table summary='diff' class='diff'>");
 491                 html("<tr><td>");
 492         }
 493         cgit_diff_tree(old_rev_oid, new_rev_oid, filepair_cb, prefix,
 494                        ctx.qry.ignorews);
 495         if (!use_ssdiff)
 496                 html("</td></tr>");
 497         html("</table>");
 498
 499         if (show_ctrls)
 500                 cgit_print_layout_end();
 501 }