rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 int main(int argc, char **argv)
   9 {
  10         int i, as_is = 0, revs_only = 0, no_revs = 0;
  11         char *def = NULL;
  12         unsigned char sha1[20];
  13
  14         for (i = 1; i < argc; i++) {
  15                 char *arg = argv[i];
  16                 char *dotdot;
  17
  18                 if (as_is) {
  19                         printf("%s\n", arg);
  20                         continue;
  21                 }
  22                 if (*arg == '-') {
  23                         if (!strcmp(arg, "--")) {
  24                                 if (def) {
  25                                         printf("%s\n", def);
  26                                         def = NULL;
  27                                 }
  28                                 if (revs_only)
  29                                         break;
  30                                 as_is = 1;
  31                         }
  32                         if (!strcmp(arg, "--default")) {
  33                                 if (def)
  34                                         printf("%s\n", def);
  35                                 def = argv[i+1];
  36                                 i++;
  37                                 continue;
  38                         }
  39                         if (!strcmp(arg, "--revs-only")) {
  40                                 revs_only = 1;
  41                                 continue;
  42                         }
  43                         if (!strcmp(arg, "--no-revs")) {
  44                                 no_revs = 1;
  45                                 continue;
  46                         }
  47                         if (revs_only)
  48                                 continue;
  49                         printf("%s\n", arg);
  50                         continue;
  51                 }
  52                 if (!get_sha1(arg, sha1)) {
  53                         if (no_revs)
  54                                 continue;
  55                         def = NULL;
  56                         printf("%s\n", sha1_to_hex(sha1));
  57                         continue;
  58                 }
  59                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
  60                         if (no_revs)
  61                                 continue;
  62                         def = NULL;
  63                         printf("^%s\n", sha1_to_hex(sha1));
  64                         continue;
  65                 }
  66                 dotdot = strstr(arg, "..");
  67                 if (dotdot) {
  68                         unsigned char end[20];
  69                         char *n = dotdot+2;
  70                         *dotdot = 0;
  71                         if (!get_sha1(arg, sha1)) {
  72                                 if (!*n)
  73                                         n = "HEAD";
  74                                 if (!get_sha1(n, end)) {
  75                                         if (no_revs)
  76                                                 continue;
  77                                         def = NULL;
  78                                         printf("%s\n", sha1_to_hex(end));
  79                                         printf("^%s\n", sha1_to_hex(sha1));
  80                                         continue;
  81                                 }
  82                         }
  83                         *dotdot = '.';
  84                 }
  85                 if (revs_only)
  86                         continue;
  87                 def = NULL;
  88                 printf("%s\n", arg);
  89         }
  90         if (def)
  91                 printf("%s\n", def);
  92         return 0;
  93 }