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