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   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 #include "quote.h"
  10
  11 #define DO_REVS         1
  12 #define DO_NOREV        2
  13 #define DO_FLAGS        4
  14 #define DO_NONFLAGS     8
  15 static int filter = ~0;
  16
  17 static char *def = NULL;
  18
  19 #define NORMAL 0
  20 #define REVERSED 1
  21 static int show_type = NORMAL;
  22 static int symbolic = 0;
  23 static int abbrev = 0;
  24 static int output_sq = 0;
  25
  26 static int revs_count = 0;
  27
  28 /*
  29  * Some arguments are relevant "revision" arguments,
  30  * others are about output format or other details.
  31  * This sorts it all out.
  32  */
  33 static int is_rev_argument(const char *arg)
  34 {
  35         static const char *rev_args[] = {
  36                 "--all",
  37                 "--bisect",
  38                 "--dense",
  39                 "--header",
  40                 "--max-age=",
  41                 "--max-count=",
  42                 "--min-age=",
  43                 "--no-merges",
  44                 "--objects",
  45                 "--objects-edge",
  46                 "--parents",
  47                 "--pretty",
  48                 "--sparse",
  49                 "--topo-order",
  50                 "--date-order",
  51                 "--unpacked",
  52                 NULL
  53         };
  54         const char **p = rev_args;
  55
  56         /* accept -<digit>, like traditional "head" */
  57         if ((*arg == '-') && isdigit(arg[1]))
  58                 return 1;
  59
  60         for (;;) {
  61                 const char *str = *p++;
  62                 int len;
  63                 if (!str)
  64                         return 0;
  65                 len = strlen(str);
  66                 if (!strcmp(arg, str) ||
  67                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  68                         return 1;
  69         }
  70 }
  71
  72 /* Output argument as a string, either SQ or normal */
  73 static void show(const char *arg)
  74 {
  75         if (output_sq) {
  76                 int sq = '\'', ch;
  77
  78                 putchar(sq);
  79                 while ((ch = *arg++)) {
  80                         if (ch == sq)
  81                                 fputs("'\\'", stdout);
  82                         putchar(ch);
  83                 }
  84                 putchar(sq);
  85                 putchar(' ');
  86         }
  87         else
  88                 puts(arg);
  89 }
  90
  91 /* Output a revision, only if filter allows it */
  92 static void show_rev(int type, const unsigned char *sha1, const char *name)
  93 {
  94         if (!(filter & DO_REVS))
  95                 return;
  96         def = NULL;
  97         revs_count++;
  98
  99         if (type != show_type)
 100                 putchar('^');
 101         if (symbolic && name)
 102                 show(name);
 103         else if (abbrev)
 104                 show(find_unique_abbrev(sha1, abbrev));
 105         else
 106                 show(sha1_to_hex(sha1));
 107 }
 108
 109 /* Output a flag, only if filter allows it. */
 110 static int show_flag(char *arg)
 111 {
 112         if (!(filter & DO_FLAGS))
 113                 return 0;
 114         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 115                 show(arg);
 116                 return 1;
 117         }
 118         return 0;
 119 }
 120
 121 static void show_default(void)
 122 {
 123         char *s = def;
 124
 125         if (s) {
 126                 unsigned char sha1[20];
 127
 128                 def = NULL;
 129                 if (!get_sha1(s, sha1)) {
 130                         show_rev(NORMAL, sha1, s);
 131                         return;
 132                 }
 133         }
 134 }
 135
 136 static int show_reference(const char *refname, const unsigned char *sha1)
 137 {
 138         show_rev(NORMAL, sha1, refname);
 139         return 0;
 140 }
 141
 142 static void show_datestring(const char *flag, const char *datestr)
 143 {
 144         static char buffer[100];
 145
 146         /* date handling requires both flags and revs */
 147         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 148                 return;
 149         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 150         show(buffer);
 151 }
 152
 153 static int show_file(const char *arg)
 154 {
 155         show_default();
 156         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 157                 show(arg);
 158                 return 1;
 159         }
 160         return 0;
 161 }
 162
 163 int main(int argc, char **argv)
 164 {
 165         int i, as_is = 0, verify = 0;
 166         unsigned char sha1[20];
 167         const char *prefix = setup_git_directory();
 168
 169         for (i = 1; i < argc; i++) {
 170                 struct stat st;
 171                 char *arg = argv[i];
 172                 char *dotdot;
 173
 174                 if (as_is) {
 175                         show_file(arg);
 176                         continue;
 177                 }
 178                 if (!strcmp(arg,"-n")) {
 179                         if (++i >= argc)
 180                                 die("-n requires an argument");
 181                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 182                                 show(arg);
 183                                 show(argv[i]);
 184                         }
 185                         continue;
 186                 }
 187                 if (!strncmp(arg,"-n",2)) {
 188                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 189                                 show(arg);
 190                         continue;
 191                 }
 192
 193                 if (*arg == '-') {
 194                         if (!strcmp(arg, "--")) {
 195                                 as_is = 1;
 196                                 /* Pass on the "--" if we show anything but files.. */
 197                                 if (filter & (DO_FLAGS | DO_REVS))
 198                                         show_file(arg);
 199                                 continue;
 200                         }
 201                         if (!strcmp(arg, "--default")) {
 202                                 def = argv[i+1];
 203                                 i++;
 204                                 continue;
 205                         }
 206                         if (!strcmp(arg, "--revs-only")) {
 207                                 filter &= ~DO_NOREV;
 208                                 continue;
 209                         }
 210                         if (!strcmp(arg, "--no-revs")) {
 211                                 filter &= ~DO_REVS;
 212                                 continue;
 213                         }
 214                         if (!strcmp(arg, "--flags")) {
 215                                 filter &= ~DO_NONFLAGS;
 216                                 continue;
 217                         }
 218                         if (!strcmp(arg, "--no-flags")) {
 219                                 filter &= ~DO_FLAGS;
 220                                 continue;
 221                         }
 222                         if (!strcmp(arg, "--verify")) {
 223                                 filter &= ~(DO_FLAGS|DO_NOREV);
 224                                 verify = 1;
 225                                 continue;
 226                         }
 227                         if (!strcmp(arg, "--short") ||
 228                             !strncmp(arg, "--short=", 8)) {
 229                                 filter &= ~(DO_FLAGS|DO_NOREV);
 230                                 verify = 1;
 231                                 abbrev = DEFAULT_ABBREV;
 232                                 if (arg[7] == '=')
 233                                         abbrev = strtoul(arg + 8, NULL, 10);
 234                                 if (abbrev < MINIMUM_ABBREV)
 235                                         abbrev = MINIMUM_ABBREV;
 236                                 else if (40 <= abbrev)
 237                                         abbrev = 40;
 238                                 continue;
 239                         }
 240                         if (!strcmp(arg, "--sq")) {
 241                                 output_sq = 1;
 242                                 continue;
 243                         }
 244                         if (!strcmp(arg, "--not")) {
 245                                 show_type ^= REVERSED;
 246                                 continue;
 247                         }
 248                         if (!strcmp(arg, "--symbolic")) {
 249                                 symbolic = 1;
 250                                 continue;
 251                         }
 252                         if (!strcmp(arg, "--all")) {
 253                                 for_each_ref(show_reference);
 254                                 continue;
 255                         }
 256                         if (!strcmp(arg, "--show-prefix")) {
 257                                 if (prefix)
 258                                         puts(prefix);
 259                                 continue;
 260                         }
 261                         if (!strcmp(arg, "--show-cdup")) {
 262                                 const char *pfx = prefix;
 263                                 while (pfx) {
 264                                         pfx = strchr(pfx, '/');
 265                                         if (pfx) {
 266                                                 pfx++;
 267                                                 printf("../");
 268                                         }
 269                                 }
 270                                 putchar('\n');
 271                                 continue;
 272                         }
 273                         if (!strcmp(arg, "--git-dir")) {
 274                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 275                                 static char cwd[PATH_MAX];
 276                                 if (gitdir) {
 277                                         puts(gitdir);
 278                                         continue;
 279                                 }
 280                                 if (!prefix) {
 281                                         puts(".git");
 282                                         continue;
 283                                 }
 284                                 if (!getcwd(cwd, PATH_MAX))
 285                                         die("unable to get current working directory");
 286                                 printf("%s/.git\n", cwd);
 287                                 continue;
 288                         }
 289                         if (!strncmp(arg, "--since=", 8)) {
 290                                 show_datestring("--max-age=", arg+8);
 291                                 continue;
 292                         }
 293                         if (!strncmp(arg, "--after=", 8)) {
 294                                 show_datestring("--max-age=", arg+8);
 295                                 continue;
 296                         }
 297                         if (!strncmp(arg, "--before=", 9)) {
 298                                 show_datestring("--min-age=", arg+9);
 299                                 continue;
 300                         }
 301                         if (!strncmp(arg, "--until=", 8)) {
 302                                 show_datestring("--min-age=", arg+8);
 303                                 continue;
 304                         }
 305                         if (show_flag(arg) && verify)
 306                                 die("Needed a single revision");
 307                         continue;
 308                 }
 309
 310                 /* Not a flag argument */
 311                 dotdot = strstr(arg, "..");
 312                 if (dotdot) {
 313                         unsigned char end[20];
 314                         char *n = dotdot+2;
 315                         *dotdot = 0;
 316                         if (!get_sha1(arg, sha1)) {
 317                                 if (!*n)
 318                                         n = "HEAD";
 319                                 if (!get_sha1(n, end)) {
 320                                         show_rev(NORMAL, end, n);
 321                                         show_rev(REVERSED, sha1, arg);
 322                                         continue;
 323                                 }
 324                         }
 325                         *dotdot = '.';
 326                 }
 327                 if (!get_sha1(arg, sha1)) {
 328                         show_rev(NORMAL, sha1, arg);
 329                         continue;
 330                 }
 331                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 332                         show_rev(REVERSED, sha1, arg+1);
 333                         continue;
 334                 }
 335                 as_is = 1;
 336                 if (!show_file(arg))
 337                         continue;
 338                 if (verify)
 339                         die("Needed a single revision");
 340                 if (lstat(arg, &st) < 0)
 341                         die("'%s': %s", arg, strerror(errno));
 342         }
 343         show_default();
 344         if (verify && revs_count != 1)
 345                 die("Needed a single revision");
 346         return 0;
 347 }