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