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