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;
  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                                 as_is = 1;
  29                         }
  30                         if (!strcmp(arg, "--default")) {
  31                                 if (def)
  32                                         printf("%s\n", def);
  33                                 def = argv[i+1];
  34                                 i++;
  35                                 continue;
  36                         }
  37                         printf("%s\n", arg);
  38                         continue;
  39                 }
  40                 def = NULL;
  41                 if (!get_sha1(arg, sha1)) {
  42                         printf("%s\n", sha1_to_hex(sha1));
  43                         continue;
  44                 }
  45                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
  46                         printf("^%s\n", sha1_to_hex(sha1));
  47                         continue;
  48                 }
  49                 dotdot = strstr(arg, "..");
  50                 if (dotdot) {
  51                         unsigned char end[20];
  52                         char *n = dotdot+2;
  53                         *dotdot = 0;
  54                         if (!get_sha1(arg, sha1)) {
  55                                 if (!*n)
  56                                         n = "HEAD";
  57                                 if (!get_sha1(n, end)) {
  58                                         printf("%s\n", sha1_to_hex(end));
  59                                         printf("^%s\n", sha1_to_hex(sha1));
  60                                         continue;
  61                                 }
  62                         }
  63                         *dotdot = '.';
  64                 }
  65                 printf("%s\n", arg);
  66         }
  67         if (def)
  68                 printf("%s\n", def);
  69         return 0;
  70 }