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
  13 unsigned char old_rev_sha1[20];
  14 unsigned char new_rev_sha1[20];
  15
  16 static int files, slots;
  17 static int total_adds, total_rems, max_changes;
  18 static int lines_added, lines_removed;
  19
  20 static struct fileinfo {
  21         char status;
  22         unsigned char old_sha1[20];
  23         unsigned char new_sha1[20];
  24         unsigned short old_mode;
  25         unsigned short new_mode;
  26         char *old_path;
  27         char *new_path;
  28         unsigned int added;
  29         unsigned int removed;
  30         unsigned long old_size;
  31         unsigned long new_size;
  32         int binary:1;
  33 } *items;
  34
  35
  36 static void print_fileinfo(struct fileinfo *info)
  37 {
  38         char *class;
  39
  40         switch (info->status) {
  41         case DIFF_STATUS_ADDED:
  42                 class = "add";
  43                 break;
  44         case DIFF_STATUS_COPIED:
  45                 class = "cpy";
  46                 break;
  47         case DIFF_STATUS_DELETED:
  48                 class = "del";
  49                 break;
  50         case DIFF_STATUS_MODIFIED:
  51                 class = "upd";
  52                 break;
  53         case DIFF_STATUS_RENAMED:
  54                 class = "mov";
  55                 break;
  56         case DIFF_STATUS_TYPE_CHANGED:
  57                 class = "typ";
  58                 break;
  59         case DIFF_STATUS_UNKNOWN:
  60                 class = "unk";
  61                 break;
  62         case DIFF_STATUS_UNMERGED:
  63                 class = "stg";
  64                 break;
  65         default:
  66                 die("bug: unhandled diff status %c", info->status);
  67         }
  68
  69         html("<tr>");
  70         htmlf("<td class='mode'>");
  71         if (is_null_sha1(info->new_sha1)) {
  72                 cgit_print_filemode(info->old_mode);
  73         } else {
  74                 cgit_print_filemode(info->new_mode);
  75         }
  76
  77         if (info->old_mode != info->new_mode &&
  78             !is_null_sha1(info->old_sha1) &&
  79             !is_null_sha1(info->new_sha1)) {
  80                 html("<span class='modechange'>[");
  81                 cgit_print_filemode(info->old_mode);
  82                 html("]</span>");
  83         }
  84         htmlf("</td><td class='%s'>", class);
  85         cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.sha1,
  86                        ctx.qry.sha2, info->new_path);
  87         if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
  88                 htmlf(" (%s from %s)",
  89                       info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
  90                       info->old_path);
  91         html("</td><td class='right'>");
  92         if (info->binary) {
  93                 htmlf("bin</td><td class='graph'>%d -> %d bytes",
  94                       info->old_size, info->new_size);
  95                 return;
  96         }
  97         htmlf("%d", info->added + info->removed);
  98         html("</td><td class='graph'>");
  99         htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
 100         htmlf("<td class='add' style='width: %.1f%%;'/>",
 101               info->added * 100.0 / max_changes);
 102         htmlf("<td class='rem' style='width: %.1f%%;'/>",
 103               info->removed * 100.0 / max_changes);
 104         htmlf("<td class='none' style='width: %.1f%%;'/>",
 105               (max_changes - info->removed - info->added) * 100.0 / max_changes);
 106         html("</tr></table></td></tr>\n");
 107 }
 108
 109 static void count_diff_lines(char *line, int len)
 110 {
 111         if (line && (len > 0)) {
 112                 if (line[0] == '+')
 113                         lines_added++;
 114                 else if (line[0] == '-')
 115                         lines_removed++;
 116         }
 117 }
 118
 119 static void inspect_filepair(struct diff_filepair *pair)
 120 {
 121         int binary = 0;
 122         unsigned long old_size = 0;
 123         unsigned long new_size = 0;
 124         files++;
 125         lines_added = 0;
 126         lines_removed = 0;
 127         cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size, &new_size,
 128                         &binary, count_diff_lines);
 129         if (files >= slots) {
 130                 if (slots == 0)
 131                         slots = 4;
 132                 else
 133                         slots = slots * 2;
 134                 items = xrealloc(items, slots * sizeof(struct fileinfo));
 135         }
 136         items[files-1].status = pair->status;
 137         hashcpy(items[files-1].old_sha1, pair->one->sha1);
 138         hashcpy(items[files-1].new_sha1, pair->two->sha1);
 139         items[files-1].old_mode = pair->one->mode;
 140         items[files-1].new_mode = pair->two->mode;
 141         items[files-1].old_path = xstrdup(pair->one->path);
 142         items[files-1].new_path = xstrdup(pair->two->path);
 143         items[files-1].added = lines_added;
 144         items[files-1].removed = lines_removed;
 145         items[files-1].old_size = old_size;
 146         items[files-1].new_size = new_size;
 147         items[files-1].binary = binary;
 148         if (lines_added + lines_removed > max_changes)
 149                 max_changes = lines_added + lines_removed;
 150         total_adds += lines_added;
 151         total_rems += lines_removed;
 152 }
 153
 154 void cgit_print_diffstat(const unsigned char *old_sha1,
 155                          const unsigned char *new_sha1)
 156 {
 157         int i;
 158
 159         html("<div class='diffstat-header'>");
 160         cgit_diff_link("Diffstat", NULL, NULL, ctx.qry.head, ctx.qry.sha1,
 161                        ctx.qry.sha2, NULL);
 162         html("</div>");
 163         html("<table summary='diffstat' class='diffstat'>");
 164         max_changes = 0;
 165         cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, NULL);
 166         for(i = 0; i<files; i++)
 167                 print_fileinfo(&items[i]);
 168         html("</table>");
 169         html("<div class='diffstat-summary'>");
 170         htmlf("%d files changed, %d insertions, %d deletions",
 171               files, total_adds, total_rems);
 172         html("</div>");
 173 }
 174
 175
 176 /*
 177  * print a single line returned from xdiff
 178  */
 179 static void print_line(char *line, int len)
 180 {
 181         char *class = "ctx";
 182         char c = line[len-1];
 183
 184         if (line[0] == '+')
 185                 class = "add";
 186         else if (line[0] == '-')
 187                 class = "del";
 188         else if (line[0] == '@')
 189                 class = "hunk";
 190
 191         htmlf("<div class='%s'>", class);
 192         line[len-1] = '\0';
 193         html_txt(line);
 194         html("</div>");
 195         line[len-1] = c;
 196 }
 197
 198 static void header(unsigned char *sha1, char *path1, int mode1,
 199                    unsigned char *sha2, char *path2, int mode2)
 200 {
 201         char *abbrev1, *abbrev2;
 202         int subproject;
 203
 204         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
 205         html("<div class='head'>");
 206         html("diff --git a/");
 207         html_txt(path1);
 208         html(" b/");
 209         html_txt(path2);
 210
 211         if (is_null_sha1(sha1))
 212                 path1 = "dev/null";
 213         if (is_null_sha1(sha2))
 214                 path2 = "dev/null";
 215
 216         if (mode1 == 0)
 217                 htmlf("<br/>new file mode %.6o", mode2);
 218
 219         if (mode2 == 0)
 220                 htmlf("<br/>deleted file mode %.6o", mode1);
 221
 222         if (!subproject) {
 223                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 224                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
 225                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
 226                 free(abbrev1);
 227                 free(abbrev2);
 228                 if (mode1 != 0 && mode2 != 0) {
 229                         htmlf(" %.6o", mode1);
 230                         if (mode2 != mode1)
 231                                 htmlf("..%.6o", mode2);
 232                 }
 233                 html("<br/>--- a/");
 234                 if (mode1 != 0)
 235                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
 236                                        sha1_to_hex(old_rev_sha1), path1);
 237                 else
 238                         html_txt(path1);
 239                 html("<br/>+++ b/");
 240                 if (mode2 != 0)
 241                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
 242                                        sha1_to_hex(new_rev_sha1), path2);
 243                 else
 244                         html_txt(path2);
 245         }
 246         html("</div>");
 247 }
 248
 249 static void filepair_cb(struct diff_filepair *pair)
 250 {
 251         unsigned long old_size = 0;
 252         unsigned long new_size = 0;
 253         int binary = 0;
 254
 255         header(pair->one->sha1, pair->one->path, pair->one->mode,
 256                pair->two->sha1, pair->two->path, pair->two->mode);
 257         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 258                 if (S_ISGITLINK(pair->one->mode))
 259                         print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 260                 if (S_ISGITLINK(pair->two->mode))
 261                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 262                 return;
 263         }
 264         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 265                             &new_size, &binary, print_line))
 266                 cgit_print_error("Error running diff");
 267         if (binary)
 268                 html("Binary files differ");
 269 }
 270
 271 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
 272 {
 273         enum object_type type;
 274         unsigned long size;
 275         struct commit *commit, *commit2;
 276
 277         if (!new_rev)
 278                 new_rev = ctx.qry.head;
 279         get_sha1(new_rev, new_rev_sha1);
 280         type = sha1_object_info(new_rev_sha1, &size);
 281         if (type == OBJ_BAD) {
 282                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 283                 return;
 284         }
 285         commit = lookup_commit_reference(new_rev_sha1);
 286         if (!commit || parse_commit(commit))
 287                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 288
 289         if (old_rev)
 290                 get_sha1(old_rev, old_rev_sha1);
 291         else if (commit->parents && commit->parents->item)
 292                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 293         else
 294                 hashclr(old_rev_sha1);
 295
 296         if (!is_null_sha1(old_rev_sha1)) {
 297                 type = sha1_object_info(old_rev_sha1, &size);
 298                 if (type == OBJ_BAD) {
 299                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 300                         return;
 301                 }
 302                 commit2 = lookup_commit_reference(old_rev_sha1);
 303                 if (!commit2 || parse_commit(commit2))
 304                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 305         }
 306         cgit_print_diffstat(old_rev_sha1, new_rev_sha1);
 307
 308         html("<table summary='diff' class='diff'>");
 309         html("<tr><td>");
 310         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
 311         html("</td></tr>");
 312         html("</table>");
 313 }