rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "commit.h"
   8 #include "refs.h"
   9
  10 #define DO_REVS         1
  11 #define DO_NOREV        2
  12 #define DO_FLAGS        4
  13 #define DO_NONFLAGS     8
  14 static int filter = ~0;
  15
  16 static char *def = NULL;
  17
  18 #define NORMAL 0
  19 #define REVERSED 1
  20 static int show_type = NORMAL;
  21 static int symbolic = 0;
  22 static int output_sq = 0;
  23
  24 static int revs_count = 0;
  25
  26 /*
  27  * Some arguments are relevant "revision" arguments,
  28  * others are about output format or other details.
  29  * This sorts it all out.
  30  */
  31 static int is_rev_argument(const char *arg)
  32 {
  33         static const char *rev_args[] = {
  34                 "--bisect",
  35                 "--header",
  36                 "--max-age=",
  37                 "--max-count=",
  38                 "--merge-order",
  39                 "--min-age=",
  40                 "--no-merges",
  41                 "--objects",
  42                 "--parents",
  43                 "--pretty",
  44                 "--show-breaks",
  45                 "--topo-order",
  46                 "--unpacked",
  47                 NULL
  48         };
  49         const char **p = rev_args;
  50
  51         for (;;) {
  52                 const char *str = *p++;
  53                 int len;
  54                 if (!str)
  55                         return 0;
  56                 len = strlen(str);
  57                 if (!strcmp(arg, str) ||
  58                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  59                         return 1;
  60         }
  61 }
  62
  63 /* Output argument as a string, either SQ or normal */
  64 static void show(const char *arg)
  65 {
  66         if (output_sq) {
  67                 int sq = '\'', ch;
  68
  69                 putchar(sq);
  70                 while ((ch = *arg++)) {
  71                         if (ch == sq)
  72                                 fputs("'\\'", stdout);
  73                         putchar(ch);
  74                 }
  75                 putchar(sq);
  76                 putchar(' ');
  77         }
  78         else
  79                 puts(arg);
  80 }
  81
  82 /* Output a revision, only if filter allows it */
  83 static void show_rev(int type, const unsigned char *sha1, const char *name)
  84 {
  85         if (!(filter & DO_REVS))
  86                 return;
  87         def = NULL;
  88         revs_count++;
  89
  90         if (type != show_type)
  91                 putchar('^');
  92         if (symbolic && name)
  93                 show(name);
  94         else
  95                 show(sha1_to_hex(sha1));
  96 }
  97
  98 /* Output a flag, only if filter allows it. */
  99 static void show_flag(char *arg)
 100 {
 101         if (!(filter & DO_FLAGS))
 102                 return;
 103         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
 104                 show(arg);
 105 }
 106
 107 static void show_default(void)
 108 {
 109         char *s = def;
 110
 111         if (s) {
 112                 unsigned char sha1[20];
 113
 114                 def = NULL;
 115                 if (!get_sha1(s, sha1)) {
 116                         show_rev(NORMAL, sha1, s);
 117                         return;
 118                 }
 119         }
 120 }
 121
 122 static int show_reference(const char *refname, const unsigned char *sha1)
 123 {
 124         show_rev(NORMAL, sha1, refname);
 125         return 0;
 126 }
 127
 128 int main(int argc, char **argv)
 129 {
 130         int i, as_is = 0, verify = 0;
 131         unsigned char sha1[20];
 132         const char *prefix = setup_git_directory();
 133
 134         for (i = 1; i < argc; i++) {
 135                 char *arg = argv[i];
 136                 char *dotdot;
 137
 138                 if (as_is) {
 139                         show(arg);
 140                         continue;
 141                 }
 142                 if (*arg == '-') {
 143                         if (!strcmp(arg, "--")) {
 144                                 as_is = 1;
 145                                 continue;
 146                         }
 147                         if (!strcmp(arg, "--default")) {
 148                                 def = argv[i+1];
 149                                 i++;
 150                                 continue;
 151                         }
 152                         if (!strcmp(arg, "--revs-only")) {
 153                                 filter &= ~DO_NOREV;
 154                                 continue;
 155                         }
 156                         if (!strcmp(arg, "--no-revs")) {
 157                                 filter &= ~DO_REVS;
 158                                 continue;
 159                         }
 160                         if (!strcmp(arg, "--flags")) {
 161                                 filter &= ~DO_NONFLAGS;
 162                                 continue;
 163                         }
 164                         if (!strcmp(arg, "--no-flags")) {
 165                                 filter &= ~DO_FLAGS;
 166                                 continue;
 167                         }
 168                         if (!strcmp(arg, "--verify")) {
 169                                 filter &= ~(DO_FLAGS|DO_NOREV);
 170                                 verify = 1;
 171                                 continue;
 172                         }
 173                         if (!strcmp(arg, "--sq")) {
 174                                 output_sq = 1;
 175                                 continue;
 176                         }
 177                         if (!strcmp(arg, "--not")) {
 178                                 show_type ^= REVERSED;
 179                                 continue;
 180                         }
 181                         if (!strcmp(arg, "--symbolic")) {
 182                                 symbolic = 1;
 183                                 continue;
 184                         }
 185                         if (!strcmp(arg, "--all")) {
 186                                 for_each_ref(show_reference);
 187                                 continue;
 188                         }
 189                         if (!strcmp(arg, "--show-prefix")) {
 190                                 if (prefix)
 191                                         puts(prefix);
 192                                 continue;
 193                         }
 194                         if (!strcmp(arg, "--git-dir")) {
 195                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 196                                 static char cwd[PATH_MAX];
 197                                 if (gitdir) {
 198                                         puts(gitdir);
 199                                         continue;
 200                                 }
 201                                 if (!prefix) {
 202                                         puts(".git");
 203                                         continue;
 204                                 }
 205                                 if (!getcwd(cwd, PATH_MAX))
 206                                         die("unable to get current working directory");
 207                                 printf("%s/.git\n", cwd);
 208                                 continue;
 209                         }
 210                         if (verify)
 211                                 die("Needed a single revision");
 212                         show_flag(arg);
 213                         continue;
 214                 }
 215
 216                 /* Not a flag argument */
 217                 dotdot = strstr(arg, "..");
 218                 if (dotdot) {
 219                         unsigned char end[20];
 220                         char *n = dotdot+2;
 221                         *dotdot = 0;
 222                         if (!get_sha1(arg, sha1)) {
 223                                 if (!*n)
 224                                         n = "HEAD";
 225                                 if (!get_sha1(n, end)) {
 226                                         show_rev(NORMAL, end, n);
 227                                         show_rev(REVERSED, sha1, arg);
 228                                         continue;
 229                                 }
 230                         }
 231                         *dotdot = '.';
 232                 }
 233                 if (!get_sha1(arg, sha1)) {
 234                         show_rev(NORMAL, sha1, arg);
 235                         continue;
 236                 }
 237                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 238                         show_rev(REVERSED, sha1, arg+1);
 239                         continue;
 240                 }
 241                 if (verify)
 242                         die("Needed a single revision");
 243                 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
 244                     (DO_NONFLAGS|DO_NOREV))
 245                         show(arg);
 246         }
 247         show_default();
 248         if (verify && revs_count != 1)
 249                 die("Needed a single revision");
 250         return 0;
 251 }