diff-stages.c

   1 /*
   2  * Copyright (c) 2005 Junio C Hamano
   3  */
   4
   5 #include "cache.h"
   6 #include "diff.h"
   7
   8 static struct diff_options diff_options;
   9
  10 static const char diff_stages_usage[] =
  11 "git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
  12 COMMON_DIFF_OPTIONS_HELP;
  13
  14 static void diff_stages(int stage1, int stage2)
  15 {
  16         int i = 0;
  17         while (i < active_nr) {
  18                 struct cache_entry *ce, *stages[4] = { NULL, };
  19                 struct cache_entry *one, *two;
  20                 const char *name;
  21                 int len;
  22                 ce = active_cache[i];
  23                 len = ce_namelen(ce);
  24                 name = ce->name;
  25                 for (;;) {
  26                         int stage = ce_stage(ce);
  27                         stages[stage] = ce;
  28                         if (active_nr <= ++i)
  29                                 break;
  30                         ce = active_cache[i];
  31                         if (ce_namelen(ce) != len ||
  32                             memcmp(name, ce->name, len))
  33                                 break;
  34                 }
  35                 one = stages[stage1];
  36                 two = stages[stage2];
  37                 if (!one && !two)
  38                         continue;
  39                 if (!one)
  40                         diff_addremove(&diff_options, '+', ntohl(two->ce_mode),
  41                                        two->sha1, name, NULL);
  42                 else if (!two)
  43                         diff_addremove(&diff_options, '-', ntohl(one->ce_mode),
  44                                        one->sha1, name, NULL);
  45                 else if (memcmp(one->sha1, two->sha1, 20) ||
  46                          (one->ce_mode != two->ce_mode) ||
  47                          diff_options.find_copies_harder)
  48                         diff_change(&diff_options,
  49                                     ntohl(one->ce_mode), ntohl(two->ce_mode),
  50                                     one->sha1, two->sha1, name, NULL);
  51         }
  52 }
  53
  54 int main(int ac, const char **av)
  55 {
  56         int stage1, stage2;
  57
  58         setup_git_directory();
  59
  60         git_config(git_diff_config);
  61         read_cache();
  62         diff_setup(&diff_options);
  63         while (1 < ac && av[1][0] == '-') {
  64                 const char *arg = av[1];
  65                 if (!strcmp(arg, "-r"))
  66                         ; /* as usual */
  67                 else {
  68                         int diff_opt_cnt;
  69                         diff_opt_cnt = diff_opt_parse(&diff_options,
  70                                                       av+1, ac-1);
  71                         if (diff_opt_cnt < 0)
  72                                 usage(diff_stages_usage);
  73                         else if (diff_opt_cnt) {
  74                                 av += diff_opt_cnt;
  75                                 ac -= diff_opt_cnt;
  76                                 continue;
  77                         }
  78                         else
  79                                 usage(diff_stages_usage);
  80                 }
  81                 ac--; av++;
  82         }
  83
  84         if (ac < 3 ||
  85             sscanf(av[1], "%d", &stage1) != 1 ||
  86             ! (0 <= stage1 && stage1 <= 3) ||
  87             sscanf(av[2], "%d", &stage2) != 1 ||
  88             ! (0 <= stage2 && stage2 <= 3))
  89                 usage(diff_stages_usage);
  90
  91         av += 3; /* The rest from av[0] are for paths restriction. */
  92         diff_options.paths = av;
  93
  94         if (diff_setup_done(&diff_options) < 0)
  95                 usage(diff_stages_usage);
  96
  97         diff_stages(stage1, stage2);
  98         diffcore_std(&diff_options);
  99         diff_flush(&diff_options);
 100         return 0;
 101 }