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 [<common diff options>] <stage1> <stage2> [<path>...]"
  21 COMMON_DIFF_OPTIONS_HELP;
  22
  23 static void diff_stages(int stage1, int stage2)
  24 {
  25         int i = 0;
  26         while (i < active_nr) {
  27                 struct cache_entry *ce, *stages[4] = { NULL, };
  28                 struct cache_entry *one, *two;
  29                 const char *name;
  30                 int len;
  31                 ce = active_cache[i];
  32                 len = ce_namelen(ce);
  33                 name = ce->name;
  34                 for (;;) {
  35                         int stage = ce_stage(ce);
  36                         stages[stage] = ce;
  37                         if (active_nr <= ++i)
  38                                 break;
  39                         ce = active_cache[i];
  40                         if (ce_namelen(ce) != len ||
  41                             memcmp(name, ce->name, len))
  42                                 break;
  43                 }
  44                 one = stages[stage1];
  45                 two = stages[stage2];
  46                 if (!one && !two)
  47                         continue;
  48                 if (!one)
  49                         diff_addremove('+', ntohl(two->ce_mode),
  50                                        two->sha1, name, NULL);
  51                 else if (!two)
  52                         diff_addremove('-', ntohl(one->ce_mode),
  53                                        one->sha1, name, NULL);
  54                 else if (memcmp(one->sha1, two->sha1, 20) ||
  55                          (one->ce_mode != two->ce_mode) ||
  56                          find_copies_harder)
  57                         diff_change(ntohl(one->ce_mode), ntohl(two->ce_mode),
  58                                     one->sha1, two->sha1, name, NULL);
  59         }
  60 }
  61
  62 int main(int ac, const char **av)
  63 {
  64         int stage1, stage2;
  65
  66         read_cache();
  67         while (1 < ac && av[1][0] == '-') {
  68                 const char *arg = av[1];
  69                 if (!strcmp(arg, "-r"))
  70                         ; /* as usual */
  71                 else if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
  72                         diff_output_format = DIFF_FORMAT_PATCH;
  73                 else if (!strncmp(arg, "-B", 2)) {
  74                         if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
  75                                 usage(diff_stages_usage);
  76                 }
  77                 else if (!strncmp(arg, "-M", 2)) {
  78                         detect_rename = DIFF_DETECT_RENAME;
  79                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  80                                 usage(diff_stages_usage);
  81                 }
  82                 else if (!strncmp(arg, "-C", 2)) {
  83                         detect_rename = DIFF_DETECT_COPY;
  84                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  85                                 usage(diff_stages_usage);
  86                 }
  87                 else if (!strcmp(arg, "--find-copies-harder"))
  88                         find_copies_harder = 1;
  89                 else if (!strcmp(arg, "-z"))
  90                         diff_output_format = DIFF_FORMAT_MACHINE;
  91                 else if (!strcmp(arg, "--name-only"))
  92                         diff_output_format = DIFF_FORMAT_NAME;
  93                 else if (!strcmp(arg, "--name-only-z"))
  94                         diff_output_format = DIFF_FORMAT_NAME_Z;
  95                 else if (!strcmp(arg, "-R"))
  96                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  97                 else if (!strncmp(arg, "-S", 2))
  98                         pickaxe = arg + 2;
  99                 else if (!strncmp(arg, "-O", 2))
 100                         orderfile = arg + 2;
 101                 else if (!strncmp(arg, "--diff-filter=", 14))
 102                         diff_filter = arg + 14;
 103                 else if (!strcmp(arg, "--pickaxe-all"))
 104                         pickaxe_opts = DIFF_PICKAXE_ALL;
 105                 else
 106                         usage(diff_stages_usage);
 107                 ac--; av++;
 108         }
 109
 110         if (ac < 3 ||
 111             sscanf(av[1], "%d", &stage1) != 1 ||
 112             ! (0 <= stage1 && stage1 <= 3) ||
 113             sscanf(av[2], "%d", &stage2) != 1 ||
 114             ! (0 <= stage2 && stage2 <= 3) ||
 115             (find_copies_harder && detect_rename != DIFF_DETECT_COPY))
 116                 usage(diff_stages_usage);
 117
 118         av += 3; /* The rest from av[0] are for paths restriction. */
 119         diff_setup(diff_setup_opt);
 120
 121         diff_stages(stage1, stage2);
 122
 123         diffcore_std(av,
 124                      detect_rename, diff_score_opt,
 125                      pickaxe, pickaxe_opts,
 126                      diff_break_opt,
 127                      orderfile,
 128                      diff_filter);
 129         diff_flush(diff_output_format);
 130         return 0;
 131 }