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 show_empty_combined = 0;
  10 static int combine_merges = 0;
  11 static int dense_combined_merges = 0;
  12 static int read_stdin = 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 char *msg)
  71 {
  72         static char this_header[16384];
  73         int offset;
  74         unsigned long len;
  75         int abbrev = diff_options.abbrev;
  76
  77         if (!verbose_header)
  78                 return sha1_to_hex(commit_sha1);
  79
  80         len = strlen(msg);
  81
  82         offset = sprintf(this_header, "%s%s ",
  83                          header_prefix,
  84                          diff_unique_abbrev(commit_sha1, abbrev));
  85         if (commit_sha1 != parent_sha1)
  86                 offset += sprintf(this_header + offset, "(from %s)\n",
  87                                   parent_sha1
  88                                   ? diff_unique_abbrev(parent_sha1, abbrev)
  89                                   : "root");
  90         else
  91                 offset += sprintf(this_header + offset, "(from parents)\n");
  92         offset += pretty_print_commit(commit_format, msg, len,
  93                                       this_header + offset,
  94                                       sizeof(this_header) - offset);
  95         return this_header;
  96 }
  97
  98 static int diff_tree_commit(const unsigned char *commit_sha1)
  99 {
 100         struct commit *commit;
 101         struct commit_list *parents;
 102         char name[50];
 103         unsigned char sha1[20];
 104
 105         sprintf(name, "%s^0", sha1_to_hex(commit_sha1));
 106         if (get_sha1(name, sha1))
 107                 return -1;
 108         name[40] = 0;
 109         commit = lookup_commit(sha1);
 110
 111         /* Root commit? */
 112         if (show_root_diff && !commit->parents) {
 113                 header = generate_header(sha1, NULL, commit->buffer);
 114                 diff_root_tree(commit_sha1, "");
 115         }
 116
 117         /* More than one parent? */
 118         if (commit->parents && commit->parents->next) {
 119                 if (ignore_merges)
 120                         return 0;
 121                 else if (combine_merges) {
 122                         header = generate_header(sha1, sha1,
 123                                                  commit->buffer);
 124                         return diff_tree_combined_merge(sha1, header,
 125                                                         show_empty_combined,
 126                                                         dense_combined_merges);
 127                 }
 128         }
 129
 130         for (parents = commit->parents; parents; parents = parents->next) {
 131                 struct commit *parent = parents->item;
 132                 header = generate_header(sha1,
 133                                          parent->object.sha1,
 134                                          commit->buffer);
 135                 diff_tree_sha1_top(parent->object.sha1, commit_sha1, "");
 136                 if (!header && verbose_header) {
 137                         header_prefix = "\ndiff-tree ";
 138                         /*
 139                          * Don't print multiple merge entries if we
 140                          * don't print the diffs.
 141                          */
 142                 }
 143         }
 144         return 0;
 145 }
 146
 147 static int diff_tree_stdin(char *line)
 148 {
 149         int len = strlen(line);
 150         unsigned char commit[20], parent[20];
 151         static char this_header[1000];
 152         int abbrev = diff_options.abbrev;
 153
 154         if (!len || line[len-1] != '\n')
 155                 return -1;
 156         line[len-1] = 0;
 157         if (get_sha1_hex(line, commit))
 158                 return -1;
 159         if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
 160                 line[40] = 0;
 161                 line[81] = 0;
 162                 sprintf(this_header, "%s (from %s)\n",
 163                         diff_unique_abbrev(commit, abbrev),
 164                         diff_unique_abbrev(parent, abbrev));
 165                 header = this_header;
 166                 return diff_tree_sha1_top(parent, commit, "");
 167         }
 168         line[40] = 0;
 169         return diff_tree_commit(commit);
 170 }
 171
 172 static const char diff_tree_usage[] =
 173 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 174 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 175 "  -r            diff recursively\n"
 176 "  --root        include the initial commit as diff against /dev/null\n"
 177 COMMON_DIFF_OPTIONS_HELP;
 178
 179 int main(int argc, const char **argv)
 180 {
 181         int nr_sha1;
 182         char line[1000];
 183         unsigned char sha1[2][20];
 184         const char *prefix = setup_git_directory();
 185
 186         git_config(git_diff_config);
 187         nr_sha1 = 0;
 188         diff_setup(&diff_options);
 189
 190         for (;;) {
 191                 int diff_opt_cnt;
 192                 const char *arg;
 193
 194                 argv++;
 195                 argc--;
 196                 arg = *argv;
 197                 if (!arg)
 198                         break;
 199
 200                 if (*arg != '-') {
 201                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
 202                                 nr_sha1++;
 203                                 continue;
 204                         }
 205                         break;
 206                 }
 207
 208                 diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
 209                 if (diff_opt_cnt < 0)
 210                         usage(diff_tree_usage);
 211                 else if (diff_opt_cnt) {
 212                         argv += diff_opt_cnt - 1;
 213                         argc -= diff_opt_cnt - 1;
 214                         continue;
 215                 }
 216
 217
 218                 if (!strcmp(arg, "--")) {
 219                         argv++;
 220                         argc--;
 221                         break;
 222                 }
 223                 if (!strcmp(arg, "-r")) {
 224                         diff_options.recursive = 1;
 225                         continue;
 226                 }
 227                 if (!strcmp(arg, "-t")) {
 228                         diff_options.recursive = 1;
 229                         diff_options.tree_in_recursive = 1;
 230                         continue;
 231                 }
 232                 if (!strcmp(arg, "-m")) {
 233                         ignore_merges = 0;
 234                         continue;
 235                 }
 236                 if (!strcmp(arg, "-c")) {
 237                         combine_merges = 1;
 238                         continue;
 239                 }
 240                 if (!strcmp(arg, "--cc")) {
 241                         dense_combined_merges = combine_merges = 1;
 242                         continue;
 243                 }
 244                 if (!strcmp(arg, "-v")) {
 245                         verbose_header = 1;
 246                         header_prefix = "diff-tree ";
 247                         continue;
 248                 }
 249                 if (!strncmp(arg, "--pretty", 8)) {
 250                         verbose_header = 1;
 251                         header_prefix = "diff-tree ";
 252                         commit_format = get_commit_format(arg+8);
 253                         continue;
 254                 }
 255                 if (!strcmp(arg, "--stdin")) {
 256                         read_stdin = 1;
 257                         continue;
 258                 }
 259                 if (!strcmp(arg, "--root")) {
 260                         show_root_diff = 1;
 261                         continue;
 262                 }
 263                 if (!strcmp(arg, "--no-commit-id")) {
 264                         no_commit_id = 1;
 265                         continue;
 266                 }
 267                 usage(diff_tree_usage);
 268         }
 269         if (diff_options.output_format == DIFF_FORMAT_PATCH)
 270                 diff_options.recursive = 1;
 271
 272         if (combine_merges) {
 273                 diff_options.output_format = DIFF_FORMAT_PATCH;
 274                 show_empty_combined = !ignore_merges;
 275                 ignore_merges = 0;
 276         }
 277
 278         diff_tree_setup_paths(get_pathspec(prefix, argv));
 279         diff_setup_done(&diff_options);
 280
 281         switch (nr_sha1) {
 282         case 0:
 283                 if (!read_stdin)
 284                         usage(diff_tree_usage);
 285                 break;
 286         case 1:
 287                 diff_tree_commit(sha1[0]);
 288                 break;
 289         case 2:
 290                 diff_tree_sha1_top(sha1[0], sha1[1], "");
 291                 break;
 292         }
 293
 294         if (!read_stdin)
 295                 return 0;
 296
 297         if (diff_options.detect_rename)
 298                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 299                                        DIFF_SETUP_USE_CACHE);
 300         while (fgets(line, sizeof(line), stdin))
 301                 diff_tree_stdin(line);
 302
 303         return 0;
 304 }