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