diff-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4
   5 static int show_root_diff = 0;
   6 static int no_commit_id = 0;
   7 static int verbose_header = 0;
   8 static int ignore_merges = 1;
   9 static int combine_merges = 0;
  10 static int dense_combined_merges = 0;
  11 static int read_stdin = 0;
  12 static int always_show_header = 0;
  13
  14 static const char *header = NULL;
  15 static const char *header_prefix = "";
  16 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  17
  18 static struct diff_options diff_options;
  19
  20 static int call_diff_flush(void)
  21 {
  22         diffcore_std(&diff_options);
  23         if (diff_queue_is_empty()) {
  24                 int saved_fmt = diff_options.output_format;
  25                 diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
  26                 diff_flush(&diff_options);
  27                 diff_options.output_format = saved_fmt;
  28                 return 0;
  29         }
  30         if (header) {
  31                 if (!no_commit_id)
  32                         printf("%s%c", header, diff_options.line_termination);
  33                 header = NULL;
  34         }
  35         diff_flush(&diff_options);
  36         return 1;
  37 }
  38
  39 static int diff_tree_sha1_top(const unsigned char *old,
  40                               const unsigned char *new, const char *base)
  41 {
  42         int ret;
  43
  44         ret = diff_tree_sha1(old, new, base, &diff_options);
  45         call_diff_flush();
  46         return ret;
  47 }
  48
  49 static int diff_root_tree(const unsigned char *new, const char *base)
  50 {
  51         int retval;
  52         void *tree;
  53         struct tree_desc empty, real;
  54
  55         tree = read_object_with_reference(new, "tree", &real.size, NULL);
  56         if (!tree)
  57                 die("unable to read root tree (%s)", sha1_to_hex(new));
  58         real.buf = tree;
  59
  60         empty.buf = "";
  61         empty.size = 0;
  62         retval = diff_tree(&empty, &real, base, &diff_options);
  63         free(tree);
  64         call_diff_flush();
  65         return retval;
  66 }
  67
  68 static const char *generate_header(const unsigned char *commit_sha1,
  69                                    const unsigned char *parent_sha1,
  70                                    const struct commit *commit)
  71 {
  72         static char this_header[16384];
  73         int offset;
  74         unsigned long len;
  75         int abbrev = diff_options.abbrev;
  76         const char *msg = commit->buffer;
  77
  78         if (!verbose_header)
  79                 return sha1_to_hex(commit_sha1);
  80
  81         len = strlen(msg);
  82
  83         offset = sprintf(this_header, "%s%s ",
  84                          header_prefix,
  85                          diff_unique_abbrev(commit_sha1, abbrev));
  86         if (commit_sha1 != parent_sha1)
  87                 offset += sprintf(this_header + offset, "(from %s)\n",
  88                                   parent_sha1
  89                                   ? diff_unique_abbrev(parent_sha1, abbrev)
  90                                   : "root");
  91         else
  92                 offset += sprintf(this_header + offset, "(from parents)\n");
  93         offset += pretty_print_commit(commit_format, commit, len,
  94                                       this_header + offset,
  95                                       sizeof(this_header) - offset, abbrev);
  96         if (always_show_header) {
  97                 puts(this_header);
  98                 return NULL;
  99         }
 100         return this_header;
 101 }
 102
 103 static int diff_tree_commit(struct commit *commit)
 104 {
 105         struct commit_list *parents;
 106         unsigned const char *sha1 = commit->object.sha1;
 107
 108         /* Root commit? */
 109         if (show_root_diff && !commit->parents) {
 110                 header = generate_header(sha1, NULL, commit);
 111                 diff_root_tree(sha1, "");
 112         }
 113
 114         /* More than one parent? */
 115         if (commit->parents && commit->parents->next) {
 116                 if (ignore_merges)
 117                         return 0;
 118                 else if (combine_merges) {
 119                         header = generate_header(sha1, sha1, commit);
 120                         header = diff_tree_combined_merge(sha1, header,
 121                                                         dense_combined_merges,
 122                                                         &diff_options);
 123                         if (!header && verbose_header)
 124                                 header_prefix = "\ndiff-tree ";
 125                         return 0;
 126                 }
 127         }
 128
 129         for (parents = commit->parents; parents; parents = parents->next) {
 130                 struct commit *parent = parents->item;
 131                 header = generate_header(sha1, parent->object.sha1, commit);
 132                 diff_tree_sha1_top(parent->object.sha1, sha1, "");
 133                 if (!header && verbose_header) {
 134                         header_prefix = "\ndiff-tree ";
 135                         /*
 136                          * Don't print multiple merge entries if we
 137                          * don't print the diffs.
 138                          */
 139                 }
 140         }
 141         return 0;
 142 }
 143
 144 static int diff_tree_commit_sha1(const unsigned char *sha1)
 145 {
 146         struct commit *commit = lookup_commit_reference(sha1);
 147         if (!commit)
 148                 return -1;
 149         return diff_tree_commit(commit);
 150 }
 151
 152 static int diff_tree_stdin(char *line)
 153 {
 154         int len = strlen(line);
 155         unsigned char sha1[20];
 156         struct commit *commit;
 157
 158         if (!len || line[len-1] != '\n')
 159                 return -1;
 160         line[len-1] = 0;
 161         if (get_sha1_hex(line, sha1))
 162                 return -1;
 163         commit = lookup_commit(sha1);
 164         if (!commit || parse_commit(commit))
 165                 return -1;
 166         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
 167                 /* Graft the fake parents locally to the commit */
 168                 int pos = 41;
 169                 struct commit_list **pptr, *parents;
 170
 171                 /* Free the real parent list */
 172                 for (parents = commit->parents; parents; ) {
 173                         struct commit_list *tmp = parents->next;
 174                         free(parents);
 175                         parents = tmp;
 176                 }
 177                 commit->parents = NULL;
 178                 pptr = &(commit->parents);
 179                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
 180                         struct commit *parent = lookup_commit(sha1);
 181                         if (parent) {
 182                                 pptr = &commit_list_insert(parent, pptr)->next;
 183                         }
 184                         pos += 41;
 185                 }
 186         }
 187         return diff_tree_commit(commit);
 188 }
 189
 190 static const char diff_tree_usage[] =
 191 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 192 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 193 "  -r            diff recursively\n"
 194 "  --root        include the initial commit as diff against /dev/null\n"
 195 COMMON_DIFF_OPTIONS_HELP;
 196
 197 int main(int argc, const char **argv)
 198 {
 199         int nr_sha1;
 200         char line[1000];
 201         unsigned char sha1[2][20];
 202         const char *prefix = setup_git_directory();
 203
 204         git_config(git_diff_config);
 205         nr_sha1 = 0;
 206         diff_setup(&diff_options);
 207
 208         for (;;) {
 209                 int diff_opt_cnt;
 210                 const char *arg;
 211
 212                 argv++;
 213                 argc--;
 214                 arg = *argv;
 215                 if (!arg)
 216                         break;
 217
 218                 if (*arg != '-') {
 219                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
 220                                 nr_sha1++;
 221                                 continue;
 222                         }
 223                         break;
 224                 }
 225
 226                 diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
 227                 if (diff_opt_cnt < 0)
 228                         usage(diff_tree_usage);
 229                 else if (diff_opt_cnt) {
 230                         argv += diff_opt_cnt - 1;
 231                         argc -= diff_opt_cnt - 1;
 232                         continue;
 233                 }
 234
 235
 236                 if (!strcmp(arg, "--")) {
 237                         argv++;
 238                         argc--;
 239                         break;
 240                 }
 241                 if (!strcmp(arg, "-r")) {
 242                         diff_options.recursive = 1;
 243                         continue;
 244                 }
 245                 if (!strcmp(arg, "-t")) {
 246                         diff_options.recursive = 1;
 247                         diff_options.tree_in_recursive = 1;
 248                         continue;
 249                 }
 250                 if (!strcmp(arg, "-m")) {
 251                         ignore_merges = 0;
 252                         continue;
 253                 }
 254                 if (!strcmp(arg, "-c")) {
 255                         combine_merges = 1;
 256                         continue;
 257                 }
 258                 if (!strcmp(arg, "--cc")) {
 259                         dense_combined_merges = combine_merges = 1;
 260                         continue;
 261                 }
 262                 if (!strcmp(arg, "-v")) {
 263                         verbose_header = 1;
 264                         header_prefix = "diff-tree ";
 265                         continue;
 266                 }
 267                 if (!strncmp(arg, "--pretty", 8)) {
 268                         verbose_header = 1;
 269                         header_prefix = "diff-tree ";
 270                         commit_format = get_commit_format(arg+8);
 271                         continue;
 272                 }
 273                 if (!strcmp(arg, "--stdin")) {
 274                         read_stdin = 1;
 275                         continue;
 276                 }
 277                 if (!strcmp(arg, "--root")) {
 278                         show_root_diff = 1;
 279                         continue;
 280                 }
 281                 if (!strcmp(arg, "--no-commit-id")) {
 282                         no_commit_id = 1;
 283                         continue;
 284                 }
 285                 if (!strcmp(arg, "--always")) {
 286                         always_show_header = 1;
 287                         continue;
 288                 }
 289                 usage(diff_tree_usage);
 290         }
 291
 292         if (combine_merges)
 293                 ignore_merges = 0;
 294
 295         /* We can only do dense combined merges with diff output */
 296         if (dense_combined_merges)
 297                 diff_options.output_format = DIFF_FORMAT_PATCH;
 298
 299         if (diff_options.output_format == DIFF_FORMAT_PATCH)
 300                 diff_options.recursive = 1;
 301
 302         diff_tree_setup_paths(get_pathspec(prefix, argv));
 303         diff_setup_done(&diff_options);
 304
 305         switch (nr_sha1) {
 306         case 0:
 307                 if (!read_stdin)
 308                         usage(diff_tree_usage);
 309                 break;
 310         case 1:
 311                 diff_tree_commit_sha1(sha1[0]);
 312                 break;
 313         case 2:
 314                 diff_tree_sha1_top(sha1[0], sha1[1], "");
 315                 break;
 316         }
 317
 318         if (!read_stdin)
 319                 return 0;
 320
 321         if (diff_options.detect_rename)
 322                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 323                                        DIFF_SETUP_USE_CACHE);
 324         while (fgets(line, sizeof(line), stdin))
 325                 diff_tree_stdin(line);
 326
 327         return 0;
 328 }