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 find_copies_harder = 0;
  11 static int diff_setup_opt = 0;
  12 static int diff_score_opt = 0;
  13 static const char *pickaxe = NULL;
  14 static int pickaxe_opts = 0;
  15 static int diff_break_opt = -1;
  16 static const char *orderfile = NULL;
  17 static const char *diff_filter = NULL;
  18
  19 static char *diff_stages_usage =
  20 "git-diff-stages [-p] [-r] [-z] [-R] [-B] [-M] [-C] [--find-copies-harder] [-O<orderfile>] [-S<string>] [--pickaxe-all] <stage1> <stage2> [<path>...]";
  21
  22 static void diff_stages(int stage1, int stage2)
  23 {
  24         int i = 0;
  25         while (i < active_nr) {
  26                 struct cache_entry *ce, *stages[4] = { NULL, };
  27                 struct cache_entry *one, *two;
  28                 const char *name;
  29                 int len;
  30                 ce = active_cache[i];
  31                 len = ce_namelen(ce);
  32                 name = ce->name;
  33                 for (;;) {
  34                         int stage = ce_stage(ce);
  35                         stages[stage] = ce;
  36                         if (active_nr <= ++i)
  37                                 break;
  38                         ce = active_cache[i];
  39                         if (ce_namelen(ce) != len ||
  40                             memcmp(name, ce->name, len))
  41                                 break;
  42                 }
  43                 one = stages[stage1];
  44                 two = stages[stage2];
  45                 if (!one && !two)
  46                         continue;
  47                 if (!one)
  48                         diff_addremove('+', ntohl(two->ce_mode),
  49                                        two->sha1, name, NULL);
  50                 else if (!two)
  51                         diff_addremove('-', ntohl(one->ce_mode),
  52                                        one->sha1, name, NULL);
  53                 else if (memcmp(one->sha1, two->sha1, 20) ||
  54                          (one->ce_mode != two->ce_mode) ||
  55                          find_copies_harder)
  56                         diff_change(ntohl(one->ce_mode), ntohl(two->ce_mode),
  57                                     one->sha1, two->sha1, name, NULL);
  58         }
  59 }
  60
  61 int main(int ac, const char **av)
  62 {
  63         int stage1, stage2;
  64
  65         read_cache();
  66         while (1 < ac && av[1][0] == '-') {
  67                 const char *arg = av[1];
  68                 if (!strcmp(arg, "-r"))
  69                         ; /* as usual */
  70                 else if (!strcmp(arg, "-p"))
  71                         diff_output_format = DIFF_FORMAT_PATCH;
  72                 else if (!strncmp(arg, "-B", 2)) {
  73                         if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
  74                                 usage(diff_stages_usage);
  75                 }
  76                 else if (!strncmp(arg, "-M", 2)) {
  77                         detect_rename = DIFF_DETECT_RENAME;
  78                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  79                                 usage(diff_stages_usage);
  80                 }
  81                 else if (!strncmp(arg, "-C", 2)) {
  82                         detect_rename = DIFF_DETECT_COPY;
  83                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  84                                 usage(diff_stages_usage);
  85                 }
  86                 else if (!strcmp(arg, "--find-copies-harder"))
  87                         find_copies_harder = 1;
  88                 else if (!strcmp(arg, "-z"))
  89                         diff_output_format = DIFF_FORMAT_MACHINE;
  90                 else if (!strcmp(arg, "-R"))
  91                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  92                 else if (!strncmp(arg, "-S", 2))
  93                         pickaxe = arg + 2;
  94                 else if (!strncmp(arg, "-O", 2))
  95                         orderfile = arg + 2;
  96                 else if (!strncmp(arg, "--diff-filter=", 14))
  97                         diff_filter = arg + 14;
  98                 else if (!strcmp(arg, "--pickaxe-all"))
  99                         pickaxe_opts = DIFF_PICKAXE_ALL;
 100                 else
 101                         usage(diff_stages_usage);
 102                 ac--; av++;
 103         }
 104
 105         if (ac < 3 ||
 106             sscanf(av[1], "%d", &stage1) != 1 ||
 107             ! (0 <= stage1 && stage1 <= 3) ||
 108             sscanf(av[2], "%d", &stage2) != 1 ||
 109             ! (0 <= stage2 && stage2 <= 3) ||
 110             (find_copies_harder && detect_rename != DIFF_DETECT_COPY))
 111                 usage(diff_stages_usage);
 112
 113         av += 3; /* The rest from av[0] are for paths restriction. */
 114         diff_setup(diff_setup_opt);
 115
 116         diff_stages(stage1, stage2);
 117
 118         diffcore_std(av,
 119                      detect_rename, diff_score_opt,
 120                      pickaxe, pickaxe_opts,
 121                      diff_break_opt,
 122                      orderfile,
 123                      diff_filter);
 124         diff_flush(diff_output_format);
 125         return 0;
 126 }