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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                 "--merge-order",
  43                 "--min-age=",
  44                 "--no-merges",
  45                 "--objects",
  46                 "--objects-edge",
  47                 "--parents",
  48                 "--pretty",
  49                 "--show-breaks",
  50                 "--sparse",
  51                 "--topo-order",
  52                 "--date-order",
  53                 "--unpacked",
  54                 NULL
  55         };
  56         const char **p = rev_args;
  57
  58         /* accept -<digit>, like traditional "head" */
  59         if ((*arg == '-') && isdigit(arg[1]))
  60                 return 1;
  61
  62         for (;;) {
  63                 const char *str = *p++;
  64                 int len;
  65                 if (!str)
  66                         return 0;
  67                 len = strlen(str);
  68                 if (!strcmp(arg, str) ||
  69                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  70                         return 1;
  71         }
  72 }
  73
  74 /* Output argument as a string, either SQ or normal */
  75 static void show(const char *arg)
  76 {
  77         if (output_sq) {
  78                 int sq = '\'', ch;
  79
  80                 putchar(sq);
  81                 while ((ch = *arg++)) {
  82                         if (ch == sq)
  83                                 fputs("'\\'", stdout);
  84                         putchar(ch);
  85                 }
  86                 putchar(sq);
  87                 putchar(' ');
  88         }
  89         else
  90                 puts(arg);
  91 }
  92
  93 /* Output a revision, only if filter allows it */
  94 static void show_rev(int type, const unsigned char *sha1, const char *name)
  95 {
  96         if (!(filter & DO_REVS))
  97                 return;
  98         def = NULL;
  99         revs_count++;
 100
 101         if (type != show_type)
 102                 putchar('^');
 103         if (symbolic && name)
 104                 show(name);
 105         else if (abbrev)
 106                 show(find_unique_abbrev(sha1, abbrev));
 107         else
 108                 show(sha1_to_hex(sha1));
 109 }
 110
 111 /* Output a flag, only if filter allows it. */
 112 static int show_flag(char *arg)
 113 {
 114         if (!(filter & DO_FLAGS))
 115                 return 0;
 116         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 117                 show(arg);
 118                 return 1;
 119         }
 120         return 0;
 121 }
 122
 123 static void show_default(void)
 124 {
 125         char *s = def;
 126
 127         if (s) {
 128                 unsigned char sha1[20];
 129
 130                 def = NULL;
 131                 if (!get_sha1(s, sha1)) {
 132                         show_rev(NORMAL, sha1, s);
 133                         return;
 134                 }
 135         }
 136 }
 137
 138 static int show_reference(const char *refname, const unsigned char *sha1)
 139 {
 140         show_rev(NORMAL, sha1, refname);
 141         return 0;
 142 }
 143
 144 static void show_datestring(const char *flag, const char *datestr)
 145 {
 146         static char buffer[100];
 147
 148         /* date handling requires both flags and revs */
 149         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 150                 return;
 151         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 152         show(buffer);
 153 }
 154
 155 static int show_file(const char *arg)
 156 {
 157         show_default();
 158         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 159                 show(arg);
 160                 return 1;
 161         }
 162         return 0;
 163 }
 164
 165 int main(int argc, char **argv)
 166 {
 167         int i, as_is = 0, verify = 0;
 168         unsigned char sha1[20];
 169         const char *prefix = setup_git_directory();
 170
 171         for (i = 1; i < argc; i++) {
 172                 struct stat st;
 173                 char *arg = argv[i];
 174                 char *dotdot;
 175
 176                 if (as_is) {
 177                         show_file(arg);
 178                         continue;
 179                 }
 180                 if (!strcmp(arg,"-n")) {
 181                         if (++i >= argc)
 182                                 die("-n requires an argument");
 183                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 184                                 show(arg);
 185                                 show(argv[i]);
 186                         }
 187                         continue;
 188                 }
 189                 if (!strncmp(arg,"-n",2)) {
 190                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 191                                 show(arg);
 192                         continue;
 193                 }
 194
 195                 if (*arg == '-') {
 196                         if (!strcmp(arg, "--")) {
 197                                 as_is = 1;
 198                                 /* Pass on the "--" if we show anything but files.. */
 199                                 if (filter & (DO_FLAGS | DO_REVS))
 200                                         show_file(arg);
 201                                 continue;
 202                         }
 203                         if (!strcmp(arg, "--default")) {
 204                                 def = argv[i+1];
 205                                 i++;
 206                                 continue;
 207                         }
 208                         if (!strcmp(arg, "--revs-only")) {
 209                                 filter &= ~DO_NOREV;
 210                                 continue;
 211                         }
 212                         if (!strcmp(arg, "--no-revs")) {
 213                                 filter &= ~DO_REVS;
 214                                 continue;
 215                         }
 216                         if (!strcmp(arg, "--flags")) {
 217                                 filter &= ~DO_NONFLAGS;
 218                                 continue;
 219                         }
 220                         if (!strcmp(arg, "--no-flags")) {
 221                                 filter &= ~DO_FLAGS;
 222                                 continue;
 223                         }
 224                         if (!strcmp(arg, "--verify")) {
 225                                 filter &= ~(DO_FLAGS|DO_NOREV);
 226                                 verify = 1;
 227                                 continue;
 228                         }
 229                         if (!strcmp(arg, "--short") ||
 230                             !strncmp(arg, "--short=", 8)) {
 231                                 filter &= ~(DO_FLAGS|DO_NOREV);
 232                                 verify = 1;
 233                                 abbrev = DEFAULT_ABBREV;
 234                                 if (arg[7] == '=')
 235                                         abbrev = strtoul(arg + 8, NULL, 10);
 236                                 if (abbrev < MINIMUM_ABBREV)
 237                                         abbrev = MINIMUM_ABBREV;
 238                                 else if (40 <= abbrev)
 239                                         abbrev = 40;
 240                                 continue;
 241                         }
 242                         if (!strcmp(arg, "--sq")) {
 243                                 output_sq = 1;
 244                                 continue;
 245                         }
 246                         if (!strcmp(arg, "--not")) {
 247                                 show_type ^= REVERSED;
 248                                 continue;
 249                         }
 250                         if (!strcmp(arg, "--symbolic")) {
 251                                 symbolic = 1;
 252                                 continue;
 253                         }
 254                         if (!strcmp(arg, "--all")) {
 255                                 for_each_ref(show_reference);
 256                                 continue;
 257                         }
 258                         if (!strcmp(arg, "--show-prefix")) {
 259                                 if (prefix)
 260                                         puts(prefix);
 261                                 continue;
 262                         }
 263                         if (!strcmp(arg, "--show-cdup")) {
 264                                 const char *pfx = prefix;
 265                                 while (pfx) {
 266                                         pfx = strchr(pfx, '/');
 267                                         if (pfx) {
 268                                                 pfx++;
 269                                                 printf("../");
 270                                         }
 271                                 }
 272                                 putchar('\n');
 273                                 continue;
 274                         }
 275                         if (!strcmp(arg, "--git-dir")) {
 276                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 277                                 static char cwd[PATH_MAX];
 278                                 if (gitdir) {
 279                                         puts(gitdir);
 280                                         continue;
 281                                 }
 282                                 if (!prefix) {
 283                                         puts(".git");
 284                                         continue;
 285                                 }
 286                                 if (!getcwd(cwd, PATH_MAX))
 287                                         die("unable to get current working directory");
 288                                 printf("%s/.git\n", cwd);
 289                                 continue;
 290                         }
 291                         if (!strncmp(arg, "--since=", 8)) {
 292                                 show_datestring("--max-age=", arg+8);
 293                                 continue;
 294                         }
 295                         if (!strncmp(arg, "--after=", 8)) {
 296                                 show_datestring("--max-age=", arg+8);
 297                                 continue;
 298                         }
 299                         if (!strncmp(arg, "--before=", 9)) {
 300                                 show_datestring("--min-age=", arg+9);
 301                                 continue;
 302                         }
 303                         if (!strncmp(arg, "--until=", 8)) {
 304                                 show_datestring("--min-age=", arg+8);
 305                                 continue;
 306                         }
 307                         if (show_flag(arg) && verify)
 308                                 die("Needed a single revision");
 309                         continue;
 310                 }
 311
 312                 /* Not a flag argument */
 313                 dotdot = strstr(arg, "..");
 314                 if (dotdot) {
 315                         unsigned char end[20];
 316                         char *n = dotdot+2;
 317                         *dotdot = 0;
 318                         if (!get_sha1(arg, sha1)) {
 319                                 if (!*n)
 320                                         n = "HEAD";
 321                                 if (!get_sha1(n, end)) {
 322                                         show_rev(NORMAL, end, n);
 323                                         show_rev(REVERSED, sha1, arg);
 324                                         continue;
 325                                 }
 326                         }
 327                         *dotdot = '.';
 328                 }
 329                 if (!get_sha1(arg, sha1)) {
 330                         show_rev(NORMAL, sha1, arg);
 331                         continue;
 332                 }
 333                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 334                         show_rev(REVERSED, sha1, arg+1);
 335                         continue;
 336                 }
 337                 as_is = 1;
 338                 if (!show_file(arg))
 339                         continue;
 340                 if (verify)
 341                         die("Needed a single revision");
 342                 if (lstat(arg, &st) < 0)
 343                         die("'%s': %s", arg, strerror(errno));
 344         }
 345         show_default();
 346         if (verify && revs_count != 1)
 347                 die("Needed a single revision");
 348         return 0;
 349 }