diff-stages.c

   1 /*
   2  * Copyright (c) 2005 Junio C Hamano
   3  */
   4
   5 #include "cache.h"
   6 #include "diff.h"
   7
   8 static int diff_output_format = DIFF_FORMAT_HUMAN;
   9 static int detect_rename = 0;
  10 static int diff_setup_opt = 0;
  11 static int diff_score_opt = 0;
  12 static const char *pickaxe = NULL;
  13 static int pickaxe_opts = 0;
  14 static int diff_break_opt = -1;
  15 static const char *orderfile = NULL;
  16 static const char *diff_filter = NULL;
  17
  18 static char *diff_stages_usage =
  19 "git-diff-stages [-p] [-r] [-z] [-M] [-C] [-R] [-S<string>] [-O<orderfile>] <stage1> <stage2> [<path>...]";
  20
  21 static void diff_stages(int stage1, int stage2)
  22 {
  23         int i = 0;
  24         while (i < active_nr) {
  25                 struct cache_entry *ce, *stages[4] = { NULL, };
  26                 struct cache_entry *one, *two;
  27                 const char *name;
  28                 int len;
  29                 ce = active_cache[i];
  30                 len = ce_namelen(ce);
  31                 name = ce->name;
  32                 for (;;) {
  33                         int stage = ce_stage(ce);
  34                         stages[stage] = ce;
  35                         if (active_nr <= ++i)
  36                                 break;
  37                         ce = active_cache[i];
  38                         if (ce_namelen(ce) != len ||
  39                             memcmp(name, ce->name, len))
  40                                 break;
  41                 }
  42                 one = stages[stage1];
  43                 two = stages[stage2];
  44                 if (!one && !two)
  45                         continue;
  46                 if (!one)
  47                         diff_addremove('+', ntohl(two->ce_mode),
  48                                        two->sha1, name, NULL);
  49                 else if (!two)
  50                         diff_addremove('-', ntohl(one->ce_mode),
  51                                        one->sha1, name, NULL);
  52                 else if (memcmp(one->sha1, two->sha1, 20) ||
  53                          (one->ce_mode != two->ce_mode))
  54                          diff_change(ntohl(one->ce_mode), ntohl(two->ce_mode),
  55                                      one->sha1, two->sha1, name, NULL);
  56         }
  57 }
  58
  59 int main(int ac, const char **av)
  60 {
  61         int stage1, stage2;
  62
  63         read_cache();
  64         while (1 < ac && av[1][0] == '-') {
  65                 const char *arg = av[1];
  66                 if (!strcmp(arg, "-r"))
  67                         ; /* as usual */
  68                 else if (!strcmp(arg, "-p"))
  69                         diff_output_format = DIFF_FORMAT_PATCH;
  70                 else if (!strncmp(arg, "-B", 2)) {
  71                         if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
  72                                 usage(diff_stages_usage);
  73                 }
  74                 else if (!strncmp(arg, "-M", 2)) {
  75                         detect_rename = DIFF_DETECT_RENAME;
  76                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  77                                 usage(diff_stages_usage);
  78                 }
  79                 else if (!strncmp(arg, "-C", 2)) {
  80                         detect_rename = DIFF_DETECT_COPY;
  81                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  82                                 usage(diff_stages_usage);
  83                 }
  84                 else if (!strcmp(arg, "-z"))
  85                         diff_output_format = DIFF_FORMAT_MACHINE;
  86                 else if (!strcmp(arg, "-R"))
  87                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  88                 else if (!strncmp(arg, "-S", 2))
  89                         pickaxe = arg + 2;
  90                 else if (!strncmp(arg, "-O", 2))
  91                         orderfile = arg + 2;
  92                 else if (!strncmp(arg, "--diff-filter=", 14))
  93                         diff_filter = arg + 14;
  94                 else if (!strcmp(arg, "--pickaxe-all"))
  95                         pickaxe_opts = DIFF_PICKAXE_ALL;
  96                 else
  97                         usage(diff_stages_usage);
  98                 ac--; av++;
  99         }
 100
 101         if (ac < 3 ||
 102             sscanf(av[1], "%d", &stage1) != 1 ||
 103             ! (0 <= stage1 && stage1 <= 3) ||
 104             sscanf(av[2], "%d", &stage2) != 1 ||
 105             ! (0 <= stage2 && stage2 <= 3))
 106                 usage(diff_stages_usage);
 107
 108         av += 3; /* The rest from av[0] are for paths restriction. */
 109         diff_setup(diff_setup_opt);
 110
 111         diff_stages(stage1, stage2);
 112
 113         diffcore_std(av,
 114                      detect_rename, diff_score_opt,
 115                      pickaxe, pickaxe_opts,
 116                      diff_break_opt,
 117                      orderfile,
 118                      diff_filter);
 119         diff_flush(diff_output_format);
 120         return 0;
 121 }