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 verbose_header = 0;
   7 static int ignore_merges = 1;
   8 static int read_stdin = 0;
   9
  10 static const char *header = NULL;
  11 static const char *header_prefix = "";
  12 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  13
  14 static struct diff_options diff_options;
  15
  16 static void call_diff_setup_done(void)
  17 {
  18         diff_setup_done(&diff_options);
  19 }
  20
  21 static int call_diff_flush(void)
  22 {
  23         diffcore_std(&diff_options);
  24         if (diff_queue_is_empty()) {
  25                 int saved_fmt = diff_options.output_format;
  26                 diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
  27                 diff_flush(&diff_options);
  28                 diff_options.output_format = saved_fmt;
  29                 return 0;
  30         }
  31         if (header) {
  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         call_diff_setup_done();
  45         ret = diff_tree_sha1(old, new, base, &diff_options);
  46         call_diff_flush();
  47         return ret;
  48 }
  49
  50 static int diff_root_tree(const unsigned char *new, const char *base)
  51 {
  52         int retval;
  53         void *tree;
  54         struct tree_desc empty, real;
  55
  56         call_diff_setup_done();
  57         tree = read_object_with_reference(new, "tree", &real.size, NULL);
  58         if (!tree)
  59                 die("unable to read root tree (%s)", sha1_to_hex(new));
  60         real.buf = tree;
  61
  62         empty.buf = "";
  63         empty.size = 0;
  64         retval = diff_tree(&empty, &real, base, &diff_options);
  65         free(tree);
  66         call_diff_flush();
  67         return retval;
  68 }
  69
  70 static const char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
  71 {
  72         static char this_header[16384];
  73         int offset;
  74
  75         if (!verbose_header)
  76                 return commit;
  77
  78         offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
  79         offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
  80         return this_header;
  81 }
  82
  83 static int diff_tree_commit(const unsigned char *commit, const char *name)
  84 {
  85         unsigned long size, offset;
  86         char *buf = read_object_with_reference(commit, "commit", &size, NULL);
  87
  88         if (!buf)
  89                 return -1;
  90
  91         if (!name) {
  92                 static char commit_name[60];
  93                 strcpy(commit_name, sha1_to_hex(commit));
  94                 name = commit_name;
  95         }
  96
  97         /* Root commit? */
  98         if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
  99                 header = generate_header(name, "root", buf, size);
 100                 diff_root_tree(commit, "");
 101         }
 102
 103         /* More than one parent? */
 104         if (ignore_merges) {
 105                 if (!memcmp(buf + 46 + 48, "parent ", 7))
 106                         return 0;
 107         }
 108
 109         offset = 46;
 110         while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
 111                 unsigned char parent[20];
 112                 if (get_sha1_hex(buf + offset + 7, parent))
 113                         return -1;
 114                 header = generate_header(name, sha1_to_hex(parent), buf, size);
 115                 diff_tree_sha1_top(parent, commit, "");
 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                 offset += 48;
 124         }
 125         free(buf);
 126         return 0;
 127 }
 128
 129 static int diff_tree_stdin(char *line)
 130 {
 131         int len = strlen(line);
 132         unsigned char commit[20], parent[20];
 133         static char this_header[1000];
 134
 135         if (!len || line[len-1] != '\n')
 136                 return -1;
 137         line[len-1] = 0;
 138         if (get_sha1_hex(line, commit))
 139                 return -1;
 140         if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
 141                 line[40] = 0;
 142                 line[81] = 0;
 143                 sprintf(this_header, "%s (from %s)\n", line, line+41);
 144                 header = this_header;
 145                 return diff_tree_sha1_top(parent, commit, "");
 146         }
 147         line[40] = 0;
 148         return diff_tree_commit(commit, line);
 149 }
 150
 151 static const char diff_tree_usage[] =
 152 "git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] "
 153 "[<common diff options>] <tree-ish> <tree-ish>"
 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_default_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                 usage(diff_tree_usage);
 233         }
 234         if (diff_options.output_format == DIFF_FORMAT_PATCH)
 235                 diff_options.recursive = 1;
 236
 237         diff_tree_setup_paths(get_pathspec(prefix, argv));
 238
 239         switch (nr_sha1) {
 240         case 0:
 241                 if (!read_stdin)
 242                         usage(diff_tree_usage);
 243                 break;
 244         case 1:
 245                 diff_tree_commit(sha1[0], NULL);
 246                 break;
 247         case 2:
 248                 diff_tree_sha1_top(sha1[0], sha1[1], "");
 249                 break;
 250         }
 251
 252         if (!read_stdin)
 253                 return 0;
 254
 255         if (diff_options.detect_rename)
 256                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 257                                        DIFF_SETUP_USE_CACHE);
 258         while (fgets(line, sizeof(line), stdin))
 259                 diff_tree_stdin(line);
 260
 261         return 0;
 262 }