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