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_RAW;
   9 static int diff_line_termination = '\n';
  10 static int detect_rename = 0;
  11 static int find_copies_harder = 0;
  12 static int diff_setup_opt = 0;
  13 static int diff_score_opt = 0;
  14 static const char *pickaxe = NULL;
  15 static int pickaxe_opts = 0;
  16 static int diff_break_opt = -1;
  17 static const char *orderfile = NULL;
  18 static const char *diff_filter = NULL;
  19
  20 static char *diff_stages_usage =
  21 "git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
  22 COMMON_DIFF_OPTIONS_HELP;
  23
  24 static void diff_stages(int stage1, int stage2)
  25 {
  26         int i = 0;
  27         while (i < active_nr) {
  28                 struct cache_entry *ce, *stages[4] = { NULL, };
  29                 struct cache_entry *one, *two;
  30                 const char *name;
  31                 int len;
  32                 ce = active_cache[i];
  33                 len = ce_namelen(ce);
  34                 name = ce->name;
  35                 for (;;) {
  36                         int stage = ce_stage(ce);
  37                         stages[stage] = ce;
  38                         if (active_nr <= ++i)
  39                                 break;
  40                         ce = active_cache[i];
  41                         if (ce_namelen(ce) != len ||
  42                             memcmp(name, ce->name, len))
  43                                 break;
  44                 }
  45                 one = stages[stage1];
  46                 two = stages[stage2];
  47                 if (!one && !two)
  48                         continue;
  49                 if (!one)
  50                         diff_addremove('+', ntohl(two->ce_mode),
  51                                        two->sha1, name, NULL);
  52                 else if (!two)
  53                         diff_addremove('-', ntohl(one->ce_mode),
  54                                        one->sha1, name, NULL);
  55                 else if (memcmp(one->sha1, two->sha1, 20) ||
  56                          (one->ce_mode != two->ce_mode) ||
  57                          find_copies_harder)
  58                         diff_change(ntohl(one->ce_mode), ntohl(two->ce_mode),
  59                                     one->sha1, two->sha1, name, NULL);
  60         }
  61 }
  62
  63 int main(int ac, const char **av)
  64 {
  65         int stage1, stage2;
  66
  67         read_cache();
  68         while (1 < ac && av[1][0] == '-') {
  69                 const char *arg = av[1];
  70                 if (!strcmp(arg, "-r"))
  71                         ; /* as usual */
  72                 else if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
  73                         diff_output_format = DIFF_FORMAT_PATCH;
  74                 else if (!strncmp(arg, "-B", 2)) {
  75                         if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
  76                                 usage(diff_stages_usage);
  77                 }
  78                 else if (!strncmp(arg, "-M", 2)) {
  79                         detect_rename = DIFF_DETECT_RENAME;
  80                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  81                                 usage(diff_stages_usage);
  82                 }
  83                 else if (!strncmp(arg, "-C", 2)) {
  84                         detect_rename = DIFF_DETECT_COPY;
  85                         if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
  86                                 usage(diff_stages_usage);
  87                 }
  88                 else if (!strcmp(arg, "--find-copies-harder"))
  89                         find_copies_harder = 1;
  90                 else if (!strcmp(arg, "-z"))
  91                         diff_line_termination = 0;
  92                 else if (!strcmp(arg, "--name-only"))
  93                         diff_output_format = DIFF_FORMAT_NAME;
  94                 else if (!strcmp(arg, "-R"))
  95                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  96                 else if (!strncmp(arg, "-S", 2))
  97                         pickaxe = arg + 2;
  98                 else if (!strncmp(arg, "-O", 2))
  99                         orderfile = arg + 2;
 100                 else if (!strncmp(arg, "--diff-filter=", 14))
 101                         diff_filter = arg + 14;
 102                 else if (!strcmp(arg, "--pickaxe-all"))
 103                         pickaxe_opts = DIFF_PICKAXE_ALL;
 104                 else
 105                         usage(diff_stages_usage);
 106                 ac--; av++;
 107         }
 108
 109         if (ac < 3 ||
 110             sscanf(av[1], "%d", &stage1) != 1 ||
 111             ! (0 <= stage1 && stage1 <= 3) ||
 112             sscanf(av[2], "%d", &stage2) != 1 ||
 113             ! (0 <= stage2 && stage2 <= 3) ||
 114             (find_copies_harder && detect_rename != DIFF_DETECT_COPY))
 115                 usage(diff_stages_usage);
 116
 117         av += 3; /* The rest from av[0] are for paths restriction. */
 118         diff_setup(diff_setup_opt);
 119
 120         diff_stages(stage1, stage2);
 121
 122         diffcore_std(av,
 123                      detect_rename, diff_score_opt,
 124                      pickaxe, pickaxe_opts,
 125                      diff_break_opt,
 126                      orderfile,
 127                      diff_filter);
 128         diff_flush(diff_output_format, diff_line_termination);
 129         return 0;
 130 }