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 ",
 102                       info->status == DIFF_STATUS_COPIED ? "copied" : "renamed");
 103                 html_txt(info->old_path);
 104                 html(")");
 105         }
 106         html("</td><td class='right'>");
 107         if (info->binary) {
 108                 htmlf("bin</td><td class='graph'>%ld -> %ld bytes",
 109                       info->old_size, info->new_size);
 110                 return;
 111         }
 112         htmlf("%d", info->added + info->removed);
 113         html("</td><td class='graph'>");
 114         htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 115         htmlf("<td class='add' style='width: %.1f%%;'/>",
 116               info->added * 100.0 / max_changes);
 117         htmlf("<td class='rem' style='width: %.1f%%;'/>",
 118               info->removed * 100.0 / max_changes);
 119         htmlf("<td class='none' style='width: %.1f%%;'/>",
 120               (max_changes - info->removed - info->added) * 100.0 / max_changes);
 121         html("</tr></table></td></tr>\n");
 122 }
 123
 124 static void count_diff_lines(char *line, int len)
 125 {
 126         if (line && (len > 0)) {
 127                 if (line[0] == '+')
 128                         lines_added++;
 129                 else if (line[0] == '-')
 130                         lines_removed++;
 131         }
 132 }
 133
 134 static void inspect_filepair(struct diff_filepair *pair)
 135 {
 136         int binary = 0;
 137         unsigned long old_size = 0;
 138         unsigned long new_size = 0;
 139         files++;
 140         lines_added = 0;
 141         lines_removed = 0;
 142         cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size, &new_size,
 143                         &binary, 0, ctx.qry.ignorews, count_diff_lines);
 144         if (files >= slots) {
 145                 if (slots == 0)
 146                         slots = 4;
 147                 else
 148                         slots = slots * 2;
 149                 items = xrealloc(items, slots * sizeof(struct fileinfo));
 150         }
 151         items[files-1].status = pair->status;
 152         hashcpy(items[files-1].old_sha1, pair->one->sha1);
 153         hashcpy(items[files-1].new_sha1, pair->two->sha1);
 154         items[files-1].old_mode = pair->one->mode;
 155         items[files-1].new_mode = pair->two->mode;
 156         items[files-1].old_path = xstrdup(pair->one->path);
 157         items[files-1].new_path = xstrdup(pair->two->path);
 158         items[files-1].added = lines_added;
 159         items[files-1].removed = lines_removed;
 160         items[files-1].old_size = old_size;
 161         items[files-1].new_size = new_size;
 162         items[files-1].binary = binary;
 163         if (lines_added + lines_removed > max_changes)
 164                 max_changes = lines_added + lines_removed;
 165         total_adds += lines_added;
 166         total_rems += lines_removed;
 167 }
 168
 169 void cgit_print_diffstat(const unsigned char *old_sha1,
 170                          const unsigned char *new_sha1, const char *prefix)
 171 {
 172         int i, save_context = ctx.qry.context;
 173
 174         html("<div class='diffstat-header'>");
 175         cgit_diff_link("Diffstat", NULL, NULL, ctx.qry.head, ctx.qry.sha1,
 176                        ctx.qry.sha2, NULL, 0);
 177         if (prefix) {
 178                 html(" (limited to '");
 179                 html_txt(prefix);
 180                 html("')");
 181         }
 182         html(" (");
 183         ctx.qry.context = (save_context > 0 ? save_context : 3) << 1;
 184         cgit_self_link("more", NULL, NULL, &ctx);
 185         html("/");
 186         ctx.qry.context = (save_context > 3 ? save_context : 3) >> 1;
 187         cgit_self_link("less", NULL, NULL, &ctx);
 188         ctx.qry.context = save_context;
 189         html(" context)");
 190         html(" (");
 191         ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
 192         cgit_self_link(ctx.qry.ignorews ? "ignore" : "show", NULL, NULL, &ctx);
 193         ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
 194         html(" whitespace changes)");
 195         html("</div>");
 196         html("<table summary='diffstat' class='diffstat'>");
 197         max_changes = 0;
 198         cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix,
 199                        ctx.qry.ignorews);
 200         for(i = 0; i<files; i++)
 201                 print_fileinfo(&items[i]);
 202         html("</table>");
 203         html("<div class='diffstat-summary'>");
 204         htmlf("%d files changed, %d insertions, %d deletions",
 205               files, total_adds, total_rems);
 206         html("</div>");
 207 }
 208
 209
 210 /*
 211  * print a single line returned from xdiff
 212  */
 213 static void print_line(char *line, int len)
 214 {
 215         char *class = "ctx";
 216         char c = line[len-1];
 217
 218         if (line[0] == '+')
 219                 class = "add";
 220         else if (line[0] == '-')
 221                 class = "del";
 222         else if (line[0] == '@')
 223                 class = "hunk";
 224
 225         htmlf("<div class='%s'>", class);
 226         line[len-1] = '\0';
 227         html_txt(line);
 228         html("</div>");
 229         line[len-1] = c;
 230 }
 231
 232 static void header(unsigned char *sha1, char *path1, int mode1,
 233                    unsigned char *sha2, char *path2, int mode2)
 234 {
 235         char *abbrev1, *abbrev2;
 236         int subproject;
 237
 238         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 239         html("<div class='head'>");
 240         html("diff --git a/");
 241         html_txt(path1);
 242         html(" b/");
 243         html_txt(path2);
 244
 245         if (is_null_sha1(sha1))
 246                 path1 = "dev/null";
 247         if (is_null_sha1(sha2))
 248                 path2 = "dev/null";
 249
 250         if (mode1 == 0)
 251                 htmlf("<br/>new file mode %.6o", mode2);
 252
 253         if (mode2 == 0)
 254                 htmlf("<br/>deleted file mode %.6o", mode1);
 255
 256         if (!subproject) {
 257                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 258                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 259                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 260                 free(abbrev1);
 261                 free(abbrev2);
 262                 if (mode1 != 0 && mode2 != 0) {
 263                         htmlf(" %.6o", mode1);
 264                         if (mode2 != mode1)
 265                                 htmlf("..%.6o", mode2);
 266                 }
 267                 html("<br/>--- a/");
 268                 if (mode1 != 0)
 269                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
 270                                        sha1_to_hex(old_rev_sha1), path1);
 271                 else
 272                         html_txt(path1);
 273                 html("<br/>+++ b/");
 274                 if (mode2 != 0)
 275                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
 276                                        sha1_to_hex(new_rev_sha1), path2);
 277                 else
 278                         html_txt(path2);
 279         }
 280         html("</div>");
 281 }
 282
 283 static void print_ssdiff_link()
 284 {
 285         if (!strcmp(ctx.qry.page, "diff")) {
 286                 if (use_ssdiff)
 287                         cgit_diff_link("Unidiff", NULL, NULL, ctx.qry.head,
 288                                        ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path, 1);
 289                 else
 290                         cgit_diff_link("Side-by-side diff", NULL, NULL,
 291                                        ctx.qry.head, ctx.qry.sha1,
 292                                        ctx.qry.sha2, ctx.qry.path, 1);
 293         }
 294 }
 295
 296 static void filepair_cb(struct diff_filepair *pair)
 297 {
 298         unsigned long old_size = 0;
 299         unsigned long new_size = 0;
 300         int binary = 0;
 301         linediff_fn print_line_fn = print_line;
 302
 303         current_filepair = pair;
 304         if (use_ssdiff) {
 305                 cgit_ssdiff_header_begin();
 306                 print_line_fn = cgit_ssdiff_line_cb;
 307         }
 308         header(pair->one->sha1, pair->one->path, pair->one->mode,
 309                pair->two->sha1, pair->two->path, pair->two->mode);
 310         if (use_ssdiff)
 311                 cgit_ssdiff_header_end();
 312         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 313                 if (S_ISGITLINK(pair->one->mode))
 314                         print_line_fn(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 315                 if (S_ISGITLINK(pair->two->mode))
 316                         print_line_fn(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 317                 if (use_ssdiff)
 318                         cgit_ssdiff_footer();
 319                 return;
 320         }
 321         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 322                             &new_size, &binary, ctx.qry.context,
 323                             ctx.qry.ignorews, print_line_fn))
 324                 cgit_print_error("Error running diff");
 325         if (binary) {
 326                 if (use_ssdiff)
 327                         html("<tr><td colspan='4'>Binary files differ</td></tr>");
 328                 else
 329                         html("Binary files differ");
 330         }
 331         if (use_ssdiff)
 332                 cgit_ssdiff_footer();
 333 }
 334
 335 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
 336 {
 337         enum object_type type;
 338         unsigned long size;
 339         struct commit *commit, *commit2;
 340
 341         if (!new_rev)
 342                 new_rev = ctx.qry.head;
 343         get_sha1(new_rev, new_rev_sha1);
 344         type = sha1_object_info(new_rev_sha1, &size);
 345         if (type == OBJ_BAD) {
 346                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 347                 return;
 348         }
 349         commit = lookup_commit_reference(new_rev_sha1);
 350         if (!commit || parse_commit(commit)) {
 351                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 352                 return;
 353         }
 354
 355         if (old_rev)
 356                 get_sha1(old_rev, old_rev_sha1);
 357         else if (commit->parents && commit->parents->item)
 358                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 359         else
 360                 hashclr(old_rev_sha1);
 361
 362         if (!is_null_sha1(old_rev_sha1)) {
 363                 type = sha1_object_info(old_rev_sha1, &size);
 364                 if (type == OBJ_BAD) {
 365                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 366                         return;
 367                 }
 368                 commit2 = lookup_commit_reference(old_rev_sha1);
 369                 if (!commit2 || parse_commit(commit2)) {
 370                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 371                         return;
 372                 }
 373         }
 374
 375         if ((ctx.qry.ssdiff && !ctx.cfg.ssdiff) || (!ctx.qry.ssdiff && ctx.cfg.ssdiff))
 376                 use_ssdiff = 1;
 377
 378         print_ssdiff_link();
 379         cgit_print_diffstat(old_rev_sha1, new_rev_sha1, prefix);
 380
 381         if (use_ssdiff) {
 382                 html("<table summary='ssdiff' class='ssdiff'>");
 383         } else {
 384                 html("<table summary='diff' class='diff'>");
 385                 html("<tr><td>");
 386         }
 387         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix,
 388                        ctx.qry.ignorews);
 389         if (!use_ssdiff)
 390                 html("</td></tr>");
 391         html("</table>");
 392 }