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(const unsigned char *commit_sha1)
 104 {
 105         struct commit *commit;
 106         struct commit_list *parents;
 107         char name[50];
 108         unsigned char sha1[20];
 109
 110         sprintf(name, "%s^0", sha1_to_hex(commit_sha1));
 111         if (get_sha1(name, sha1))
 112                 return -1;
 113         name[40] = 0;
 114         commit = lookup_commit(sha1);
 115
 116         /* Root commit? */
 117         if (show_root_diff && !commit->parents) {
 118                 header = generate_header(sha1, NULL, commit);
 119                 diff_root_tree(commit_sha1, "");
 120         }
 121
 122         /* More than one parent? */
 123         if (commit->parents && commit->parents->next) {
 124                 if (ignore_merges)
 125                         return 0;
 126                 else if (combine_merges) {
 127                         header = generate_header(sha1, sha1, commit);
 128                         return diff_tree_combined_merge(sha1, header,
 129                                                         dense_combined_merges);
 130                 }
 131         }
 132
 133         for (parents = commit->parents; parents; parents = parents->next) {
 134                 struct commit *parent = parents->item;
 135                 header = generate_header(sha1, parent->object.sha1, commit);
 136                 diff_tree_sha1_top(parent->object.sha1, commit_sha1, "");
 137                 if (!header && verbose_header) {
 138                         header_prefix = "\ndiff-tree ";
 139                         /*
 140                          * Don't print multiple merge entries if we
 141                          * don't print the diffs.
 142                          */
 143                 }
 144         }
 145         return 0;
 146 }
 147
 148 static int diff_tree_stdin(char *line)
 149 {
 150         int len = strlen(line);
 151         unsigned char commit[20], parent[20];
 152         static char this_header[1000];
 153         int abbrev = diff_options.abbrev;
 154
 155         if (!len || line[len-1] != '\n')
 156                 return -1;
 157         line[len-1] = 0;
 158         if (get_sha1_hex(line, commit))
 159                 return -1;
 160         if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
 161                 line[40] = 0;
 162                 line[81] = 0;
 163                 sprintf(this_header, "%s (from %s)\n",
 164                         diff_unique_abbrev(commit, abbrev),
 165                         diff_unique_abbrev(parent, abbrev));
 166                 header = this_header;
 167                 return diff_tree_sha1_top(parent, commit, "");
 168         }
 169         line[40] = 0;
 170         return diff_tree_commit(commit);
 171 }
 172
 173 static const char diff_tree_usage[] =
 174 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 175 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 176 "  -r            diff recursively\n"
 177 "  --root        include the initial commit as diff against /dev/null\n"
 178 COMMON_DIFF_OPTIONS_HELP;
 179
 180 int main(int argc, const char **argv)
 181 {
 182         int nr_sha1;
 183         char line[1000];
 184         unsigned char sha1[2][20];
 185         const char *prefix = setup_git_directory();
 186
 187         git_config(git_diff_config);
 188         nr_sha1 = 0;
 189         diff_setup(&diff_options);
 190
 191         for (;;) {
 192                 int diff_opt_cnt;
 193                 const char *arg;
 194
 195                 argv++;
 196                 argc--;
 197                 arg = *argv;
 198                 if (!arg)
 199                         break;
 200
 201                 if (*arg != '-') {
 202                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
 203                                 nr_sha1++;
 204                                 continue;
 205                         }
 206                         break;
 207                 }
 208
 209                 diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
 210                 if (diff_opt_cnt < 0)
 211                         usage(diff_tree_usage);
 212                 else if (diff_opt_cnt) {
 213                         argv += diff_opt_cnt - 1;
 214                         argc -= diff_opt_cnt - 1;
 215                         continue;
 216                 }
 217
 218
 219                 if (!strcmp(arg, "--")) {
 220                         argv++;
 221                         argc--;
 222                         break;
 223                 }
 224                 if (!strcmp(arg, "-r")) {
 225                         diff_options.recursive = 1;
 226                         continue;
 227                 }
 228                 if (!strcmp(arg, "-t")) {
 229                         diff_options.recursive = 1;
 230                         diff_options.tree_in_recursive = 1;
 231                         continue;
 232                 }
 233                 if (!strcmp(arg, "-m")) {
 234                         ignore_merges = 0;
 235                         continue;
 236                 }
 237                 if (!strcmp(arg, "-c")) {
 238                         combine_merges = 1;
 239                         continue;
 240                 }
 241                 if (!strcmp(arg, "--cc")) {
 242                         dense_combined_merges = combine_merges = 1;
 243                         continue;
 244                 }
 245                 if (!strcmp(arg, "-v")) {
 246                         verbose_header = 1;
 247                         header_prefix = "diff-tree ";
 248                         continue;
 249                 }
 250                 if (!strncmp(arg, "--pretty", 8)) {
 251                         verbose_header = 1;
 252                         header_prefix = "diff-tree ";
 253                         commit_format = get_commit_format(arg+8);
 254                         continue;
 255                 }
 256                 if (!strcmp(arg, "--stdin")) {
 257                         read_stdin = 1;
 258                         continue;
 259                 }
 260                 if (!strcmp(arg, "--root")) {
 261                         show_root_diff = 1;
 262                         continue;
 263                 }
 264                 if (!strcmp(arg, "--no-commit-id")) {
 265                         no_commit_id = 1;
 266                         continue;
 267                 }
 268                 if (!strcmp(arg, "--always")) {
 269                         always_show_header = 1;
 270                         continue;
 271                 }
 272                 usage(diff_tree_usage);
 273         }
 274         if (diff_options.output_format == DIFF_FORMAT_PATCH)
 275                 diff_options.recursive = 1;
 276
 277         if (combine_merges) {
 278                 diff_options.output_format = DIFF_FORMAT_PATCH;
 279                 ignore_merges = 0;
 280         }
 281
 282         diff_tree_setup_paths(get_pathspec(prefix, argv));
 283         diff_setup_done(&diff_options);
 284
 285         switch (nr_sha1) {
 286         case 0:
 287                 if (!read_stdin)
 288                         usage(diff_tree_usage);
 289                 break;
 290         case 1:
 291                 diff_tree_commit(sha1[0]);
 292                 break;
 293         case 2:
 294                 diff_tree_sha1_top(sha1[0], sha1[1], "");
 295                 break;
 296         }
 297
 298         if (!read_stdin)
 299                 return 0;
 300
 301         if (diff_options.detect_rename)
 302                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 303                                        DIFF_SETUP_USE_CACHE);
 304         while (fgets(line, sizeof(line), stdin))
 305                 diff_tree_stdin(line);
 306
 307         return 0;
 308 }