ui-diff.c

   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 #include "ui-ssdiff.h"
  13
  14 unsigned char old_rev_sha1[20];
  15 unsigned char new_rev_sha1[20];
  16
  17 static int files, slots;
  18 static int total_adds, total_rems, max_changes;
  19 static int lines_added, lines_removed;
  20
  21 static 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         unsigned long old_size;
  32         unsigned long new_size;
  33         int binary:1;
  34 } *items;
  35
  36 static int use_ssdiff = 0;
  37 static struct diff_filepair *current_filepair;
  38
  39 struct diff_filespec *cgit_get_current_old_file(void)
  40 {
  41         return current_filepair->one;
  42 }
  43
  44 struct diff_filespec *cgit_get_current_new_file(void)
  45 {
  46         return current_filepair->two;
  47 }
  48
  49 static void print_fileinfo(struct fileinfo *info)
  50 {
  51         char *class;
  52
  53         switch (info->status) {
  54         case DIFF_STATUS_ADDED:
  55                 class = "add";
  56                 break;
  57         case DIFF_STATUS_COPIED:
  58                 class = "cpy";
  59                 break;
  60         case DIFF_STATUS_DELETED:
  61                 class = "del";
  62                 break;
  63         case DIFF_STATUS_MODIFIED:
  64                 class = "upd";
  65                 break;
  66         case DIFF_STATUS_RENAMED:
  67                 class = "mov";
  68                 break;
  69         case DIFF_STATUS_TYPE_CHANGED:
  70                 class = "typ";
  71                 break;
  72         case DIFF_STATUS_UNKNOWN:
  73                 class = "unk";
  74                 break;
  75         case DIFF_STATUS_UNMERGED:
  76                 class = "stg";
  77                 break;
  78         default:
  79                 die("bug: unhandled diff status %c", info->status);
  80         }
  81
  82         html("<tr>");
  83         htmlf("<td class='mode'>");
  84         if (is_null_sha1(info->new_sha1)) {
  85                 cgit_print_filemode(info->old_mode);
  86         } else {
  87                 cgit_print_filemode(info->new_mode);
  88         }
  89
  90         if (info->old_mode != info->new_mode &&
  91             !is_null_sha1(info->old_sha1) &&
  92             !is_null_sha1(info->new_sha1)) {
  93                 html("<span class='modechange'>[");
  94                 cgit_print_filemode(info->old_mode);
  95                 html("]</span>");
  96         }
  97         htmlf("</td><td class='%s'>", class);
  98         cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.sha1,
  99                        ctx.qry.sha2, info->new_path, 0);
 100         if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
 101                 htmlf(" (%s from %s)",
 102                       info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
 103                       info->old_path);
 104         html("</td><td class='right'>");
 105         if (info->binary) {
 106                 htmlf("bin</td><td class='graph'>%ld -> %ld bytes",
 107                       info->old_size, info->new_size);
 108                 return;
 109         }
 110         htmlf("%d", info->added + info->removed);
 111         html("</td><td class='graph'>");
 112         htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 113         htmlf("<td class='add' style='width: %.1f%%;'/>",
 114               info->added * 100.0 / max_changes);
 115         htmlf("<td class='rem' style='width: %.1f%%;'/>",
 116               info->removed * 100.0 / max_changes);
 117         htmlf("<td class='none' style='width: %.1f%%;'/>",
 118               (max_changes - info->removed - info->added) * 100.0 / max_changes);
 119         html("</tr></table></td></tr>\n");
 120 }
 121
 122 static void count_diff_lines(char *line, int len)
 123 {
 124         if (line && (len > 0)) {
 125                 if (line[0] == '+')
 126                         lines_added++;
 127                 else if (line[0] == '-')
 128                         lines_removed++;
 129         }
 130 }
 131
 132 static void inspect_filepair(struct diff_filepair *pair)
 133 {
 134         int binary = 0;
 135         unsigned long old_size = 0;
 136         unsigned long new_size = 0;
 137         files++;
 138         lines_added = 0;
 139         lines_removed = 0;
 140         cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size, &new_size,
 141                         &binary, 0, ctx.qry.ignorews, count_diff_lines);
 142         if (files >= slots) {
 143                 if (slots == 0)
 144                         slots = 4;
 145                 else
 146                         slots = slots * 2;
 147                 items = xrealloc(items, slots * sizeof(struct fileinfo));
 148         }
 149         items[files-1].status = pair->status;
 150         hashcpy(items[files-1].old_sha1, pair->one->sha1);
 151         hashcpy(items[files-1].new_sha1, pair->two->sha1);
 152         items[files-1].old_mode = pair->one->mode;
 153         items[files-1].new_mode = pair->two->mode;
 154         items[files-1].old_path = xstrdup(pair->one->path);
 155         items[files-1].new_path = xstrdup(pair->two->path);
 156         items[files-1].added = lines_added;
 157         items[files-1].removed = lines_removed;
 158         items[files-1].old_size = old_size;
 159         items[files-1].new_size = new_size;
 160         items[files-1].binary = binary;
 161         if (lines_added + lines_removed > max_changes)
 162                 max_changes = lines_added + lines_removed;
 163         total_adds += lines_added;
 164         total_rems += lines_removed;
 165 }
 166
 167 void cgit_print_diffstat(const unsigned char *old_sha1,
 168                          const unsigned char *new_sha1, const char *prefix)
 169 {
 170         int i, save_context = ctx.qry.context;
 171
 172         html("<div class='diffstat-header'>");
 173         cgit_diff_link("Diffstat", NULL, NULL, ctx.qry.head, ctx.qry.sha1,
 174                        ctx.qry.sha2, NULL, 0);
 175         if (prefix) {
 176                 html(" (limited to '");
 177                 html_txt(prefix);
 178                 html("')");
 179         }
 180         html(" (");
 181         ctx.qry.context = (save_context > 0 ? save_context : 3) << 1;
 182         cgit_self_link("more", NULL, NULL, &ctx);
 183         html("/");
 184         ctx.qry.context = (save_context > 3 ? save_context : 3) >> 1;
 185         cgit_self_link("less", NULL, NULL, &ctx);
 186         ctx.qry.context = save_context;
 187         html(" context)");
 188         html(" (");
 189         ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
 190         cgit_self_link(ctx.qry.ignorews ? "ignore" : "show", NULL, NULL, &ctx);
 191         ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
 192         html(" whitespace changes)");
 193         html("</div>");
 194         html("<table summary='diffstat' class='diffstat'>");
 195         max_changes = 0;
 196         cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix,
 197                        ctx.qry.ignorews);
 198         for(i = 0; i<files; i++)
 199                 print_fileinfo(&items[i]);
 200         html("</table>");
 201         html("<div class='diffstat-summary'>");
 202         htmlf("%d files changed, %d insertions, %d deletions",
 203               files, total_adds, total_rems);
 204         html("</div>");
 205 }
 206
 207
 208 /*
 209  * print a single line returned from xdiff
 210  */
 211 static void print_line(char *line, int len)
 212 {
 213         char *class = "ctx";
 214         char c = line[len-1];
 215
 216         if (line[0] == '+')
 217                 class = "add";
 218         else if (line[0] == '-')
 219                 class = "del";
 220         else if (line[0] == '@')
 221                 class = "hunk";
 222
 223         htmlf("<div class='%s'>", class);
 224         line[len-1] = '\0';
 225         html_txt(line);
 226         html("</div>");
 227         line[len-1] = c;
 228 }
 229
 230 static void header(unsigned char *sha1, char *path1, int mode1,
 231                    unsigned char *sha2, char *path2, int mode2)
 232 {
 233         char *abbrev1, *abbrev2;
 234         int subproject;
 235
 236         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 237         html("<div class='head'>");
 238         html("diff --git a/");
 239         html_txt(path1);
 240         html(" b/");
 241         html_txt(path2);
 242
 243         if (is_null_sha1(sha1))
 244                 path1 = "dev/null";
 245         if (is_null_sha1(sha2))
 246                 path2 = "dev/null";
 247
 248         if (mode1 == 0)
 249                 htmlf("<br/>new file mode %.6o", mode2);
 250
 251         if (mode2 == 0)
 252                 htmlf("<br/>deleted file mode %.6o", mode1);
 253
 254         if (!subproject) {
 255                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 256                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 257                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 258                 free(abbrev1);
 259                 free(abbrev2);
 260                 if (mode1 != 0 && mode2 != 0) {
 261                         htmlf(" %.6o", mode1);
 262                         if (mode2 != mode1)
 263                                 htmlf("..%.6o", mode2);
 264                 }
 265                 html("<br/>--- a/");
 266                 if (mode1 != 0)
 267                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
 268                                        sha1_to_hex(old_rev_sha1), path1);
 269                 else
 270                         html_txt(path1);
 271                 html("<br/>+++ b/");
 272                 if (mode2 != 0)
 273                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
 274                                        sha1_to_hex(new_rev_sha1), path2);
 275                 else
 276                         html_txt(path2);
 277         }
 278         html("</div>");
 279 }
 280
 281 static void print_ssdiff_link()
 282 {
 283         if (!strcmp(ctx.qry.page, "diff")) {
 284                 if (use_ssdiff)
 285                         cgit_diff_link("Unidiff", NULL, NULL, ctx.qry.head,
 286                                        ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path, 1);
 287                 else
 288                         cgit_diff_link("Side-by-side diff", NULL, NULL,
 289                                        ctx.qry.head, ctx.qry.sha1,
 290                                        ctx.qry.sha2, ctx.qry.path, 1);
 291         }
 292 }
 293
 294 static void filepair_cb(struct diff_filepair *pair)
 295 {
 296         unsigned long old_size = 0;
 297         unsigned long new_size = 0;
 298         int binary = 0;
 299         linediff_fn print_line_fn = print_line;
 300
 301         current_filepair = pair;
 302         if (use_ssdiff) {
 303                 cgit_ssdiff_header_begin();
 304                 print_line_fn = cgit_ssdiff_line_cb;
 305         }
 306         header(pair->one->sha1, pair->one->path, pair->one->mode,
 307                pair->two->sha1, pair->two->path, pair->two->mode);
 308         if (use_ssdiff)
 309                 cgit_ssdiff_header_end();
 310         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 311                 if (S_ISGITLINK(pair->one->mode))
 312                         print_line_fn(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 313                 if (S_ISGITLINK(pair->two->mode))
 314                         print_line_fn(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 315                 if (use_ssdiff)
 316                         cgit_ssdiff_footer();
 317                 return;
 318         }
 319         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 320                             &new_size, &binary, ctx.qry.context,
 321                             ctx.qry.ignorews, print_line_fn))
 322                 cgit_print_error("Error running diff");
 323         if (binary) {
 324                 if (use_ssdiff)
 325                         html("<tr><td colspan='4'>Binary files differ</td></tr>");
 326                 else
 327                         html("Binary files differ");
 328         }
 329         if (use_ssdiff)
 330                 cgit_ssdiff_footer();
 331 }
 332
 333 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
 334 {
 335         enum object_type type;
 336         unsigned long size;
 337         struct commit *commit, *commit2;
 338
 339         if (!new_rev)
 340                 new_rev = ctx.qry.head;
 341         get_sha1(new_rev, new_rev_sha1);
 342         type = sha1_object_info(new_rev_sha1, &size);
 343         if (type == OBJ_BAD) {
 344                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 345                 return;
 346         }
 347         commit = lookup_commit_reference(new_rev_sha1);
 348         if (!commit || parse_commit(commit)) {
 349                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 350                 return;
 351         }
 352
 353         if (old_rev)
 354                 get_sha1(old_rev, old_rev_sha1);
 355         else if (commit->parents && commit->parents->item)
 356                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 357         else
 358                 hashclr(old_rev_sha1);
 359
 360         if (!is_null_sha1(old_rev_sha1)) {
 361                 type = sha1_object_info(old_rev_sha1, &size);
 362                 if (type == OBJ_BAD) {
 363                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 364                         return;
 365                 }
 366                 commit2 = lookup_commit_reference(old_rev_sha1);
 367                 if (!commit2 || parse_commit(commit2)) {
 368                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 369                         return;
 370                 }
 371         }
 372
 373         if ((ctx.qry.ssdiff && !ctx.cfg.ssdiff) || (!ctx.qry.ssdiff && ctx.cfg.ssdiff))
 374                 use_ssdiff = 1;
 375
 376         print_ssdiff_link();
 377         cgit_print_diffstat(old_rev_sha1, new_rev_sha1, prefix);
 378
 379         if (use_ssdiff) {
 380                 html("<table summary='ssdiff' class='ssdiff'>");
 381         } else {
 382                 html("<table summary='diff' class='diff'>");
 383                 html("<tr><td>");
 384         }
 385         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix,
 386                        ctx.qry.ignorews);
 387         if (!use_ssdiff)
 388                 html("</td></tr>");
 389         html("</table>");
 390 }