rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 /*
   9  * Some arguments are relevant "revision" arguments,
  10  * others are about output format or other details.
  11  * This sorts it all out.
  12  */
  13 static int is_rev_argument(const char *arg)
  14 {
  15         static const char *rev_args[] = {
  16                 "--max-count=",
  17                 "--max-age=",
  18                 "--min-age=",
  19                 "--merge-order",
  20                 NULL
  21         };
  22         const char **p = rev_args;
  23
  24         for (;;) {
  25                 const char *str = *p++;
  26                 int len;
  27                 if (!str)
  28                         return 0;
  29                 len = strlen(str);
  30                 if (!strncmp(arg, str, len))
  31                         return 1;
  32         }
  33 }
  34
  35 int main(int argc, char **argv)
  36 {
  37         int i, as_is = 0, revs_only = 0, no_revs = 0;
  38         char *def = NULL;
  39         unsigned char sha1[20];
  40
  41         for (i = 1; i < argc; i++) {
  42                 char *arg = argv[i];
  43                 char *dotdot;
  44
  45                 if (as_is) {
  46                         printf("%s\n", arg);
  47                         continue;
  48                 }
  49                 if (*arg == '-') {
  50                         if (!strcmp(arg, "--")) {
  51                                 if (def) {
  52                                         printf("%s\n", def);
  53                                         def = NULL;
  54                                 }
  55                                 if (revs_only)
  56                                         break;
  57                                 as_is = 1;
  58                         }
  59                         if (!strcmp(arg, "--default")) {
  60                                 if (def)
  61                                         printf("%s\n", def);
  62                                 def = argv[i+1];
  63                                 i++;
  64                                 continue;
  65                         }
  66                         if (!strcmp(arg, "--revs-only")) {
  67                                 revs_only = 1;
  68                                 continue;
  69                         }
  70                         if (!strcmp(arg, "--no-revs")) {
  71                                 no_revs = 1;
  72                                 continue;
  73                         }
  74                         if (revs_only | no_revs) {
  75                                 if (is_rev_argument(arg) != revs_only)
  76                                         continue;
  77                         }
  78                         printf("%s\n", arg);
  79                         continue;
  80                 }
  81                 dotdot = strstr(arg, "..");
  82                 if (dotdot) {
  83                         unsigned char end[20];
  84                         char *n = dotdot+2;
  85                         *dotdot = 0;
  86                         if (!get_sha1(arg, sha1)) {
  87                                 if (!*n)
  88                                         n = "HEAD";
  89                                 if (!get_sha1(n, end)) {
  90                                         if (no_revs)
  91                                                 continue;
  92                                         def = NULL;
  93                                         printf("%s\n", sha1_to_hex(end));
  94                                         printf("^%s\n", sha1_to_hex(sha1));
  95                                         continue;
  96                                 }
  97                         }
  98                         *dotdot = '.';
  99                 }
 100                 if (!get_sha1(arg, sha1)) {
 101                         if (no_revs)
 102                                 continue;
 103                         def = NULL;
 104                         printf("%s\n", sha1_to_hex(sha1));
 105                         continue;
 106                 }
 107                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 108                         if (no_revs)
 109                                 continue;
 110                         def = NULL;
 111                         printf("^%s\n", sha1_to_hex(sha1));
 112                         continue;
 113                 }
 114                 if (revs_only)
 115                         continue;
 116                 def = NULL;
 117                 printf("%s\n", arg);
 118         }
 119         if (def)
 120                 printf("%s\n", def);
 121         return 0;
 122 }