diff-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "log-tree.h"
   5
   6 static struct log_tree_opt log_tree_opt;
   7
   8 static int diff_tree_commit_sha1(const unsigned char *sha1)
   9 {
  10         struct commit *commit = lookup_commit_reference(sha1);
  11         if (!commit)
  12                 return -1;
  13         return log_tree_commit(&log_tree_opt, commit);
  14 }
  15
  16 static int diff_tree_stdin(char *line)
  17 {
  18         int len = strlen(line);
  19         unsigned char sha1[20];
  20         struct commit *commit;
  21
  22         if (!len || line[len-1] != '\n')
  23                 return -1;
  24         line[len-1] = 0;
  25         if (get_sha1_hex(line, sha1))
  26                 return -1;
  27         commit = lookup_commit(sha1);
  28         if (!commit || parse_commit(commit))
  29                 return -1;
  30         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  31                 /* Graft the fake parents locally to the commit */
  32                 int pos = 41;
  33                 struct commit_list **pptr, *parents;
  34
  35                 /* Free the real parent list */
  36                 for (parents = commit->parents; parents; ) {
  37                         struct commit_list *tmp = parents->next;
  38                         free(parents);
  39                         parents = tmp;
  40                 }
  41                 commit->parents = NULL;
  42                 pptr = &(commit->parents);
  43                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  44                         struct commit *parent = lookup_commit(sha1);
  45                         if (parent) {
  46                                 pptr = &commit_list_insert(parent, pptr)->next;
  47                         }
  48                         pos += 41;
  49                 }
  50         }
  51         return log_tree_commit(&log_tree_opt, commit);
  52 }
  53
  54 static const char diff_tree_usage[] =
  55 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  56 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  57 "  -r            diff recursively\n"
  58 "  --root        include the initial commit as diff against /dev/null\n"
  59 COMMON_DIFF_OPTIONS_HELP;
  60
  61 int main(int argc, const char **argv)
  62 {
  63         int nr_sha1;
  64         char line[1000];
  65         unsigned char sha1[2][20];
  66         const char *prefix = setup_git_directory();
  67         static struct log_tree_opt *opt = &log_tree_opt;
  68         int read_stdin = 0;
  69
  70         git_config(git_diff_config);
  71         nr_sha1 = 0;
  72         init_log_tree_opt(opt);
  73
  74         for (;;) {
  75                 int opt_cnt;
  76                 const char *arg;
  77
  78                 argv++;
  79                 argc--;
  80                 arg = *argv;
  81                 if (!arg)
  82                         break;
  83
  84                 if (*arg != '-') {
  85                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
  86                                 nr_sha1++;
  87                                 continue;
  88                         }
  89                         break;
  90                 }
  91
  92                 opt_cnt = log_tree_opt_parse(opt, argv, argc);
  93                 if (opt_cnt < 0)
  94                         usage(diff_tree_usage);
  95                 else if (opt_cnt) {
  96                         argv += opt_cnt - 1;
  97                         argc -= opt_cnt - 1;
  98                         continue;
  99                 }
 100
 101                 if (!strcmp(arg, "--")) {
 102                         argv++;
 103                         argc--;
 104                         break;
 105                 }
 106                 if (!strcmp(arg, "--stdin")) {
 107                         read_stdin = 1;
 108                         continue;
 109                 }
 110                 usage(diff_tree_usage);
 111         }
 112
 113         if (opt->combine_merges)
 114                 opt->ignore_merges = 0;
 115
 116         /* We can only do dense combined merges with diff output */
 117         if (opt->dense_combined_merges)
 118                 opt->diffopt.output_format = DIFF_FORMAT_PATCH;
 119
 120         diff_tree_setup_paths(get_pathspec(prefix, argv), &opt->diffopt);
 121         diff_setup_done(&opt->diffopt);
 122
 123         switch (nr_sha1) {
 124         case 0:
 125                 if (!read_stdin)
 126                         usage(diff_tree_usage);
 127                 break;
 128         case 1:
 129                 diff_tree_commit_sha1(sha1[0]);
 130                 break;
 131         case 2:
 132                 diff_tree_sha1(sha1[0], sha1[1], "", &opt->diffopt);
 133                 log_tree_diff_flush(opt);
 134                 break;
 135         }
 136
 137         if (!read_stdin)
 138                 return 0;
 139
 140         if (opt->diffopt.detect_rename)
 141                 opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 142                                        DIFF_SETUP_USE_CACHE);
 143         while (fgets(line, sizeof(line), stdin))
 144                 diff_tree_stdin(line);
 145
 146         return 0;
 147 }