Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "diff.h"
   3#include "commit.h"
   4
   5static int show_root_diff = 0;
   6static int no_commit_id = 0;
   7static int verbose_header = 0;
   8static int ignore_merges = 1;
   9static int show_empty_combined = 0;
  10static int combine_merges = 0;
  11static int read_stdin = 0;
  12
  13static const char *header = NULL;
  14static const char *header_prefix = "";
  15static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  16
  17static struct diff_options diff_options;
  18
  19static int call_diff_flush(void)
  20{
  21        diffcore_std(&diff_options);
  22        if (diff_queue_is_empty()) {
  23                int saved_fmt = diff_options.output_format;
  24                diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
  25                diff_flush(&diff_options);
  26                diff_options.output_format = saved_fmt;
  27                return 0;
  28        }
  29        if (header) {
  30                if (!no_commit_id)
  31                        printf("%s%c", header, diff_options.line_termination);
  32                header = NULL;
  33        }
  34        diff_flush(&diff_options);
  35        return 1;
  36}
  37
  38static int diff_tree_sha1_top(const unsigned char *old,
  39                              const unsigned char *new, const char *base)
  40{
  41        int ret;
  42
  43        ret = diff_tree_sha1(old, new, base, &diff_options);
  44        call_diff_flush();
  45        return ret;
  46}
  47
  48static int diff_root_tree(const unsigned char *new, const char *base)
  49{
  50        int retval;
  51        void *tree;
  52        struct tree_desc empty, real;
  53
  54        tree = read_object_with_reference(new, "tree", &real.size, NULL);
  55        if (!tree)
  56                die("unable to read root tree (%s)", sha1_to_hex(new));
  57        real.buf = tree;
  58
  59        empty.buf = "";
  60        empty.size = 0;
  61        retval = diff_tree(&empty, &real, base, &diff_options);
  62        free(tree);
  63        call_diff_flush();
  64        return retval;
  65}
  66
  67static const char *generate_header(const unsigned char *commit_sha1,
  68                                   const unsigned char *parent_sha1,
  69                                   const char *msg)
  70{
  71        static char this_header[16384];
  72        int offset;
  73        unsigned long len;
  74        int abbrev = diff_options.abbrev;
  75
  76        if (!verbose_header)
  77                return sha1_to_hex(commit_sha1);
  78
  79        len = strlen(msg);
  80
  81        offset = sprintf(this_header, "%s%s ",
  82                         header_prefix,
  83                         diff_unique_abbrev(commit_sha1, abbrev));
  84        if (commit_sha1 != parent_sha1)
  85                offset += sprintf(this_header + offset, "(from %s)\n",
  86                                  parent_sha1
  87                                  ? diff_unique_abbrev(parent_sha1, abbrev)
  88                                  : "root");
  89        else
  90                offset += sprintf(this_header + offset, "(from parents)\n");
  91        offset += pretty_print_commit(commit_format, msg, len,
  92                                      this_header + offset,
  93                                      sizeof(this_header) - offset);
  94        return this_header;
  95}
  96
  97static int diff_tree_commit(const unsigned char *commit_sha1)
  98{
  99        struct commit *commit;
 100        struct commit_list *parents;
 101        char name[50];
 102        unsigned char sha1[20];
 103
 104        sprintf(name, "%s^0", sha1_to_hex(commit_sha1));
 105        if (get_sha1(name, sha1))
 106                return -1;
 107        name[40] = 0;
 108        commit = lookup_commit(sha1);
 109        
 110        /* Root commit? */
 111        if (show_root_diff && !commit->parents) {
 112                header = generate_header(sha1, NULL, commit->buffer);
 113                diff_root_tree(commit_sha1, "");
 114        }
 115
 116        /* More than one parent? */
 117        if (commit->parents && commit->parents->next) {
 118                if (ignore_merges)
 119                        return 0;
 120                else if (combine_merges) {
 121                        header = generate_header(sha1, sha1,
 122                                                 commit->buffer);
 123                        return diff_tree_combined_merge(sha1, header,
 124                                                        show_empty_combined);
 125                }
 126        }
 127
 128        for (parents = commit->parents; parents; parents = parents->next) {
 129                struct commit *parent = parents->item;
 130                header = generate_header(sha1,
 131                                         parent->object.sha1,
 132                                         commit->buffer);
 133                diff_tree_sha1_top(parent->object.sha1, commit_sha1, "");
 134                if (!header && verbose_header) {
 135                        header_prefix = "\ndiff-tree ";
 136                        /*
 137                         * Don't print multiple merge entries if we
 138                         * don't print the diffs.
 139                         */
 140                }
 141        }
 142        return 0;
 143}
 144
 145static int diff_tree_stdin(char *line)
 146{
 147        int len = strlen(line);
 148        unsigned char commit[20], parent[20];
 149        static char this_header[1000];
 150        int abbrev = diff_options.abbrev;
 151
 152        if (!len || line[len-1] != '\n')
 153                return -1;
 154        line[len-1] = 0;
 155        if (get_sha1_hex(line, commit))
 156                return -1;
 157        if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
 158                line[40] = 0;
 159                line[81] = 0;
 160                sprintf(this_header, "%s (from %s)\n",
 161                        diff_unique_abbrev(commit, abbrev),
 162                        diff_unique_abbrev(parent, abbrev));
 163                header = this_header;
 164                return diff_tree_sha1_top(parent, commit, "");
 165        }
 166        line[40] = 0;
 167        return diff_tree_commit(commit);
 168}
 169
 170static const char diff_tree_usage[] =
 171"git-diff-tree [--stdin] [-m] [-c] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 172"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 173"  -r            diff recursively\n"
 174"  --root        include the initial commit as diff against /dev/null\n"
 175COMMON_DIFF_OPTIONS_HELP;
 176
 177int main(int argc, const char **argv)
 178{
 179        int nr_sha1;
 180        char line[1000];
 181        unsigned char sha1[2][20];
 182        const char *prefix = setup_git_directory();
 183
 184        git_config(git_diff_config);
 185        nr_sha1 = 0;
 186        diff_setup(&diff_options);
 187
 188        for (;;) {
 189                int diff_opt_cnt;
 190                const char *arg;
 191
 192                argv++;
 193                argc--;
 194                arg = *argv;
 195                if (!arg)
 196                        break;
 197
 198                if (*arg != '-') {
 199                        if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
 200                                nr_sha1++;
 201                                continue;
 202                        }
 203                        break;
 204                }
 205
 206                diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
 207                if (diff_opt_cnt < 0)
 208                        usage(diff_tree_usage);
 209                else if (diff_opt_cnt) {
 210                        argv += diff_opt_cnt - 1;
 211                        argc -= diff_opt_cnt - 1;
 212                        continue;
 213                }
 214
 215
 216                if (!strcmp(arg, "--")) {
 217                        argv++;
 218                        argc--;
 219                        break;
 220                }
 221                if (!strcmp(arg, "-r")) {
 222                        diff_options.recursive = 1;
 223                        continue;
 224                }
 225                if (!strcmp(arg, "-t")) {
 226                        diff_options.recursive = 1;
 227                        diff_options.tree_in_recursive = 1;
 228                        continue;
 229                }
 230                if (!strcmp(arg, "-m")) {
 231                        ignore_merges = 0;
 232                        continue;
 233                }
 234                if (!strcmp(arg, "-c")) {
 235                        combine_merges = 1;
 236                        continue;
 237                }
 238                if (!strcmp(arg, "-v")) {
 239                        verbose_header = 1;
 240                        header_prefix = "diff-tree ";
 241                        continue;
 242                }
 243                if (!strncmp(arg, "--pretty", 8)) {
 244                        verbose_header = 1;
 245                        header_prefix = "diff-tree ";
 246                        commit_format = get_commit_format(arg+8);
 247                        continue;
 248                }
 249                if (!strcmp(arg, "--stdin")) {
 250                        read_stdin = 1;
 251                        continue;
 252                }
 253                if (!strcmp(arg, "--root")) {
 254                        show_root_diff = 1;
 255                        continue;
 256                }
 257                if (!strcmp(arg, "--no-commit-id")) {
 258                        no_commit_id = 1;
 259                        continue;
 260                }
 261                usage(diff_tree_usage);
 262        }
 263        if (diff_options.output_format == DIFF_FORMAT_PATCH)
 264                diff_options.recursive = 1;
 265
 266        if (combine_merges) {
 267                diff_options.output_format = DIFF_FORMAT_PATCH;
 268                show_empty_combined = !ignore_merges;
 269                ignore_merges = 0;
 270        }
 271
 272        diff_tree_setup_paths(get_pathspec(prefix, argv));
 273        diff_setup_done(&diff_options);
 274
 275        switch (nr_sha1) {
 276        case 0:
 277                if (!read_stdin)
 278                        usage(diff_tree_usage);
 279                break;
 280        case 1:
 281                diff_tree_commit(sha1[0]);
 282                break;
 283        case 2:
 284                diff_tree_sha1_top(sha1[0], sha1[1], "");
 285                break;
 286        }
 287
 288        if (!read_stdin)
 289                return 0;
 290
 291        if (diff_options.detect_rename)
 292                diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 293                                       DIFF_SETUP_USE_CACHE);
 294        while (fgets(line, sizeof(line), stdin))
 295                diff_tree_stdin(line);
 296
 297        return 0;
 298}