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;
 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("</div>");
 183         html("<table summary='diffstat' class='diffstat'>");
 184         max_changes = 0;
 185         cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix,
 186                        ctx.qry.ignorews);
 187         for (i = 0; i<files; i++)
 188                 print_fileinfo(&items[i]);
 189         html("</table>");
 190         html("<div class='diffstat-summary'>");
 191         htmlf("%d files changed, %d insertions, %d deletions",
 192               files, total_adds, total_rems);
 193         html("</div>");
 194 }
 195
 196
 197 /*
 198  * print a single line returned from xdiff
 199  */
 200 static void print_line(char *line, int len)
 201 {
 202         char *class = "ctx";
 203         char c = line[len-1];
 204
 205         if (line[0] == '+')
 206                 class = "add";
 207         else if (line[0] == '-')
 208                 class = "del";
 209         else if (line[0] == '@')
 210                 class = "hunk";
 211
 212         htmlf("<div class='%s'>", class);
 213         line[len-1] = '\0';
 214         html_txt(line);
 215         html("</div>");
 216         line[len-1] = c;
 217 }
 218
 219 static void header(unsigned char *sha1, char *path1, int mode1,
 220                    unsigned char *sha2, char *path2, int mode2)
 221 {
 222         char *abbrev1, *abbrev2;
 223         int subproject;
 224
 225         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 226         html("<div class='head'>");
 227         html("diff --git a/");
 228         html_txt(path1);
 229         html(" b/");
 230         html_txt(path2);
 231
 232         if (mode1 == 0)
 233                 htmlf("<br/>new file mode %.6o", mode2);
 234
 235         if (mode2 == 0)
 236                 htmlf("<br/>deleted file mode %.6o", mode1);
 237
 238         if (!subproject) {
 239                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 240                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 241                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 242                 free(abbrev1);
 243                 free(abbrev2);
 244                 if (mode1 != 0 && mode2 != 0) {
 245                         htmlf(" %.6o", mode1);
 246                         if (mode2 != mode1)
 247                                 htmlf("..%.6o", mode2);
 248                 }
 249                 if (is_null_sha1(sha1)) {
 250                         path1 = "dev/null";
 251                         html("<br/>--- /");
 252                 } else
 253                         html("<br/>--- a/");
 254                 if (mode1 != 0)
 255                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
 256                                        sha1_to_hex(old_rev_sha1), path1);
 257                 else
 258                         html_txt(path1);
 259                 if (is_null_sha1(sha2)) {
 260                         path2 = "dev/null";
 261                         html("<br/>+++ /");
 262                 } else
 263                         html("<br/>+++ b/");
 264                 if (mode2 != 0)
 265                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
 266                                        sha1_to_hex(new_rev_sha1), path2);
 267                 else
 268                         html_txt(path2);
 269         }
 270         html("</div>");
 271 }
 272
 273 static void filepair_cb(struct diff_filepair *pair)
 274 {
 275         unsigned long old_size = 0;
 276         unsigned long new_size = 0;
 277         int binary = 0;
 278         linediff_fn print_line_fn = print_line;
 279
 280         current_filepair = pair;
 281         if (use_ssdiff) {
 282                 cgit_ssdiff_header_begin();
 283                 print_line_fn = cgit_ssdiff_line_cb;
 284         }
 285         header(pair->one->sha1, pair->one->path, pair->one->mode,
 286                pair->two->sha1, pair->two->path, pair->two->mode);
 287         if (use_ssdiff)
 288                 cgit_ssdiff_header_end();
 289         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 290                 if (S_ISGITLINK(pair->one->mode))
 291                         print_line_fn(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 292                 if (S_ISGITLINK(pair->two->mode))
 293                         print_line_fn(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 294                 if (use_ssdiff)
 295                         cgit_ssdiff_footer();
 296                 return;
 297         }
 298         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 299                             &new_size, &binary, ctx.qry.context,
 300                             ctx.qry.ignorews, print_line_fn))
 301                 cgit_print_error("Error running diff");
 302         if (binary) {
 303                 if (use_ssdiff)
 304                         html("<tr><td colspan='4'>Binary files differ</td></tr>");
 305                 else
 306                         html("Binary files differ");
 307         }
 308         if (use_ssdiff)
 309                 cgit_ssdiff_footer();
 310 }
 311
 312 void cgit_print_diff_ctrls()
 313 {
 314         int i, curr;
 315
 316         html("<div class='cgit-panel'>");
 317         html("<b>diff options</b>");
 318         html("<form method='get' action='.'>");
 319         cgit_add_hidden_formfields(1, 0, ctx.qry.page);
 320         html("<table>");
 321         html("<tr><td colspan='2'/></tr>");
 322         html("<tr>");
 323         html("<td class='label'>context:</td>");
 324         html("<td class='ctrl'>");
 325         html("<select name='context' onchange='this.form.submit();'>");
 326         curr = ctx.qry.context;
 327         if (!curr)
 328                 curr = 3;
 329         for (i = 1; i <= 10; i++)
 330                 html_intoption(i, fmt("%d", i), curr);
 331         for (i = 15; i <= 40; i += 5)
 332                 html_intoption(i, fmt("%d", i), curr);
 333         html("</select>");
 334         html("</td>");
 335         html("</tr><tr>");
 336         html("<td class='label'>space:</td>");
 337         html("<td class='ctrl'>");
 338         html("<select name='ignorews' onchange='this.form.submit();'>");
 339         html_intoption(0, "include", ctx.qry.ignorews);
 340         html_intoption(1, "ignore", ctx.qry.ignorews);
 341         html("</select>");
 342         html("</td>");
 343         html("</tr><tr>");
 344         html("<td class='label'>mode:</td>");
 345         html("<td class='ctrl'>");
 346         html("<select name='ss' onchange='this.form.submit();'>");
 347         curr = ctx.qry.has_ssdiff ? ctx.qry.ssdiff : ctx.cfg.ssdiff;
 348         html_intoption(0, "unified", curr);
 349         html_intoption(1, "ssdiff", curr);
 350         html("</select></td></tr>");
 351         html("<tr><td/><td class='ctrl'>");
 352         html("<noscript><input type='submit' value='reload'/></noscript>");
 353         html("</td></tr></table>");
 354         html("</form>");
 355         html("</div>");
 356 }
 357
 358 void cgit_print_diff(const char *new_rev, const char *old_rev,
 359                      const char *prefix, int show_ctrls)
 360 {
 361         enum object_type type;
 362         unsigned long size;
 363         struct commit *commit, *commit2;
 364
 365         if (!new_rev)
 366                 new_rev = ctx.qry.head;
 367         get_sha1(new_rev, new_rev_sha1);
 368         type = sha1_object_info(new_rev_sha1, &size);
 369         if (type == OBJ_BAD) {
 370                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 371                 return;
 372         }
 373         commit = lookup_commit_reference(new_rev_sha1);
 374         if (!commit || parse_commit(commit)) {
 375                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 376                 return;
 377         }
 378
 379         if (old_rev)
 380                 get_sha1(old_rev, old_rev_sha1);
 381         else if (commit->parents && commit->parents->item)
 382                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 383         else
 384                 hashclr(old_rev_sha1);
 385
 386         if (!is_null_sha1(old_rev_sha1)) {
 387                 type = sha1_object_info(old_rev_sha1, &size);
 388                 if (type == OBJ_BAD) {
 389                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 390                         return;
 391                 }
 392                 commit2 = lookup_commit_reference(old_rev_sha1);
 393                 if (!commit2 || parse_commit(commit2)) {
 394                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 395                         return;
 396                 }
 397         }
 398
 399         use_ssdiff = ctx.qry.has_ssdiff ? ctx.qry.ssdiff : ctx.cfg.ssdiff;
 400
 401         if (show_ctrls)
 402                 cgit_print_diff_ctrls();
 403
 404         cgit_print_diffstat(old_rev_sha1, new_rev_sha1, prefix);
 405
 406         if (use_ssdiff) {
 407                 html("<table summary='ssdiff' class='ssdiff'>");
 408         } else {
 409                 html("<table summary='diff' class='diff'>");
 410                 html("<tr><td>");
 411         }
 412         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix,
 413                        ctx.qry.ignorews);
 414         if (!use_ssdiff)
 415                 html("</td></tr>");
 416         html("</table>");
 417 }