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, unsigned long len)
  73 {
  74         static char this_header[16384];
  75         int offset;
  76
  77         if (!verbose_header)
  78                 return commit;
  79
  80         offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
  81         offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
  82         return this_header;
  83 }
  84
  85 static int diff_tree_commit(const unsigned char *commit, const char *name)
  86 {
  87         unsigned long size, offset;
  88         char *buf = read_object_with_reference(commit, "commit", &size, NULL);
  89
  90         if (!buf)
  91                 return -1;
  92
  93         if (!name) {
  94                 static char commit_name[60];
  95                 strcpy(commit_name, sha1_to_hex(commit));
  96                 name = commit_name;
  97         }
  98
  99         /* Root commit? */
 100         if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
 101                 header = generate_header(name, "root", buf, size);
 102                 diff_root_tree(commit, "");
 103         }
 104
 105         /* More than one parent? */
 106         if (ignore_merges) {
 107                 if (!memcmp(buf + 46 + 48, "parent ", 7))
 108                         return 0;
 109         }
 110
 111         offset = 46;
 112         while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
 113                 unsigned char parent[20];
 114                 if (get_sha1_hex(buf + offset + 7, parent))
 115                         return -1;
 116                 header = generate_header(name, sha1_to_hex(parent), buf, size);
 117                 diff_tree_sha1_top(parent, commit, "");
 118                 if (!header && verbose_header) {
 119                         header_prefix = "\ndiff-tree ";
 120                         /*
 121                          * Don't print multiple merge entries if we
 122                          * don't print the diffs.
 123                          */
 124                 }
 125                 offset += 48;
 126         }
 127         free(buf);
 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
 137         if (!len || line[len-1] != '\n')
 138                 return -1;
 139         line[len-1] = 0;
 140         if (get_sha1_hex(line, commit))
 141                 return -1;
 142         if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
 143                 line[40] = 0;
 144                 line[81] = 0;
 145                 sprintf(this_header, "%s (from %s)\n", line, line+41);
 146                 header = this_header;
 147                 return diff_tree_sha1_top(parent, commit, "");
 148         }
 149         line[40] = 0;
 150         return diff_tree_commit(commit, line);
 151 }
 152
 153 static const char diff_tree_usage[] =
 154 "git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 155 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 156 "  -r            diff recursively\n"
 157 "  --root        include the initial commit as diff against /dev/null\n"
 158 COMMON_DIFF_OPTIONS_HELP;
 159
 160 int main(int argc, const char **argv)
 161 {
 162         int nr_sha1;
 163         char line[1000];
 164         unsigned char sha1[2][20];
 165         const char *prefix = setup_git_directory();
 166
 167         git_config(git_default_config);
 168         nr_sha1 = 0;
 169         diff_setup(&diff_options);
 170
 171         for (;;) {
 172                 int diff_opt_cnt;
 173                 const char *arg;
 174
 175                 argv++;
 176                 argc--;
 177                 arg = *argv;
 178                 if (!arg)
 179                         break;
 180
 181                 if (*arg != '-') {
 182                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
 183                                 nr_sha1++;
 184                                 continue;
 185                         }
 186                         break;
 187                 }
 188
 189                 diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
 190                 if (diff_opt_cnt < 0)
 191                         usage(diff_tree_usage);
 192                 else if (diff_opt_cnt) {
 193                         argv += diff_opt_cnt - 1;
 194                         argc -= diff_opt_cnt - 1;
 195                         continue;
 196                 }
 197
 198
 199                 if (!strcmp(arg, "--")) {
 200                         argv++;
 201                         argc--;
 202                         break;
 203                 }
 204                 if (!strcmp(arg, "-r")) {
 205                         diff_options.recursive = 1;
 206                         continue;
 207                 }
 208                 if (!strcmp(arg, "-t")) {
 209                         diff_options.recursive = 1;
 210                         diff_options.tree_in_recursive = 1;
 211                         continue;
 212                 }
 213                 if (!strcmp(arg, "-m")) {
 214                         ignore_merges = 0;
 215                         continue;
 216                 }
 217                 if (!strcmp(arg, "-v")) {
 218                         verbose_header = 1;
 219                         header_prefix = "diff-tree ";
 220                         continue;
 221                 }
 222                 if (!strncmp(arg, "--pretty", 8)) {
 223                         verbose_header = 1;
 224                         header_prefix = "diff-tree ";
 225                         commit_format = get_commit_format(arg+8);
 226                         continue;
 227                 }
 228                 if (!strcmp(arg, "--stdin")) {
 229                         read_stdin = 1;
 230                         continue;
 231                 }
 232                 if (!strcmp(arg, "--root")) {
 233                         show_root_diff = 1;
 234                         continue;
 235                 }
 236                 if (!strcmp(arg, "--no-commit-id")) {
 237                         no_commit_id = 1;
 238                         continue;
 239                 }
 240                 usage(diff_tree_usage);
 241         }
 242         if (diff_options.output_format == DIFF_FORMAT_PATCH)
 243                 diff_options.recursive = 1;
 244
 245         diff_tree_setup_paths(get_pathspec(prefix, argv));
 246
 247         switch (nr_sha1) {
 248         case 0:
 249                 if (!read_stdin)
 250                         usage(diff_tree_usage);
 251                 break;
 252         case 1:
 253                 diff_tree_commit(sha1[0], NULL);
 254                 break;
 255         case 2:
 256                 diff_tree_sha1_top(sha1[0], sha1[1], "");
 257                 break;
 258         }
 259
 260         if (!read_stdin)
 261                 return 0;
 262
 263         if (diff_options.detect_rename)
 264                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 265                                        DIFF_SETUP_USE_CACHE);
 266         while (fgets(line, sizeof(line), stdin))
 267                 diff_tree_stdin(line);
 268
 269         return 0;
 270 }