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 #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                 "--parents",
  47                 "--pretty",
  48                 "--show-breaks",
  49                 "--sparse",
  50                 "--topo-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 void show_flag(char *arg)
 111 {
 112         if (!(filter & DO_FLAGS))
 113                 return;
 114         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
 115                 show(arg);
 116 }
 117
 118 static void show_default(void)
 119 {
 120         char *s = def;
 121
 122         if (s) {
 123                 unsigned char sha1[20];
 124
 125                 def = NULL;
 126                 if (!get_sha1(s, sha1)) {
 127                         show_rev(NORMAL, sha1, s);
 128                         return;
 129                 }
 130         }
 131 }
 132
 133 static int show_reference(const char *refname, const unsigned char *sha1)
 134 {
 135         show_rev(NORMAL, sha1, refname);
 136         return 0;
 137 }
 138
 139 static void show_datestring(const char *flag, const char *datestr)
 140 {
 141         static char buffer[100];
 142
 143         /* date handling requires both flags and revs */
 144         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 145                 return;
 146         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 147         show(buffer);
 148 }
 149
 150 static void show_file(const char *arg)
 151 {
 152         show_default();
 153         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
 154                 show(arg);
 155 }
 156
 157 int main(int argc, char **argv)
 158 {
 159         int i, as_is = 0, verify = 0;
 160         unsigned char sha1[20];
 161         const char *prefix = setup_git_directory();
 162
 163         for (i = 1; i < argc; i++) {
 164                 struct stat st;
 165                 char *arg = argv[i];
 166                 char *dotdot;
 167
 168                 if (as_is) {
 169                         show_file(arg);
 170                         continue;
 171                 }
 172                 if (!strcmp(arg,"-n")) {
 173                         if (++i >= argc)
 174                                 die("-n requires an argument");
 175                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 176                                 show(arg);
 177                                 show(argv[i]);
 178                         }
 179                         continue;
 180                 }
 181                 if (!strncmp(arg,"-n",2)) {
 182                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 183                                 show(arg);
 184                         continue;
 185                 }
 186
 187                 if (*arg == '-') {
 188                         if (!strcmp(arg, "--")) {
 189                                 as_is = 1;
 190                                 /* Pass on the "--" if we show anything but files.. */
 191                                 if (filter & (DO_FLAGS | DO_REVS))
 192                                         show_file(arg);
 193                                 continue;
 194                         }
 195                         if (!strcmp(arg, "--default")) {
 196                                 def = argv[i+1];
 197                                 i++;
 198                                 continue;
 199                         }
 200                         if (!strcmp(arg, "--revs-only")) {
 201                                 filter &= ~DO_NOREV;
 202                                 continue;
 203                         }
 204                         if (!strcmp(arg, "--no-revs")) {
 205                                 filter &= ~DO_REVS;
 206                                 continue;
 207                         }
 208                         if (!strcmp(arg, "--flags")) {
 209                                 filter &= ~DO_NONFLAGS;
 210                                 continue;
 211                         }
 212                         if (!strcmp(arg, "--no-flags")) {
 213                                 filter &= ~DO_FLAGS;
 214                                 continue;
 215                         }
 216                         if (!strcmp(arg, "--verify")) {
 217                                 filter &= ~(DO_FLAGS|DO_NOREV);
 218                                 verify = 1;
 219                                 continue;
 220                         }
 221                         if (!strcmp(arg, "--short") ||
 222                             !strncmp(arg, "--short=", 9)) {
 223                                 filter &= ~(DO_FLAGS|DO_NOREV);
 224                                 verify = 1;
 225                                 abbrev = DEFAULT_ABBREV;
 226                                 if (arg[8] == '=')
 227                                         abbrev = strtoul(arg + 9, NULL, 10);
 228                                 if (abbrev < MINIMUM_ABBREV)
 229                                         abbrev = MINIMUM_ABBREV;
 230                                 else if (40 <= abbrev)
 231                                         abbrev = 40;
 232                                 continue;
 233                         }
 234                         if (!strcmp(arg, "--sq")) {
 235                                 output_sq = 1;
 236                                 continue;
 237                         }
 238                         if (!strcmp(arg, "--not")) {
 239                                 show_type ^= REVERSED;
 240                                 continue;
 241                         }
 242                         if (!strcmp(arg, "--symbolic")) {
 243                                 symbolic = 1;
 244                                 continue;
 245                         }
 246                         if (!strcmp(arg, "--all")) {
 247                                 for_each_ref(show_reference);
 248                                 continue;
 249                         }
 250                         if (!strcmp(arg, "--show-prefix")) {
 251                                 if (prefix)
 252                                         puts(prefix);
 253                                 continue;
 254                         }
 255                         if (!strcmp(arg, "--show-cdup")) {
 256                                 const char *pfx = prefix;
 257                                 while (pfx) {
 258                                         pfx = strchr(pfx, '/');
 259                                         if (pfx) {
 260                                                 pfx++;
 261                                                 printf("../");
 262                                         }
 263                                 }
 264                                 putchar('\n');
 265                                 continue;
 266                         }
 267                         if (!strcmp(arg, "--git-dir")) {
 268                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 269                                 static char cwd[PATH_MAX];
 270                                 if (gitdir) {
 271                                         puts(gitdir);
 272                                         continue;
 273                                 }
 274                                 if (!prefix) {
 275                                         puts(".git");
 276                                         continue;
 277                                 }
 278                                 if (!getcwd(cwd, PATH_MAX))
 279                                         die("unable to get current working directory");
 280                                 printf("%s/.git\n", cwd);
 281                                 continue;
 282                         }
 283                         if (!strncmp(arg, "--since=", 8)) {
 284                                 show_datestring("--max-age=", arg+8);
 285                                 continue;
 286                         }
 287                         if (!strncmp(arg, "--after=", 8)) {
 288                                 show_datestring("--max-age=", arg+8);
 289                                 continue;
 290                         }
 291                         if (!strncmp(arg, "--before=", 9)) {
 292                                 show_datestring("--min-age=", arg+9);
 293                                 continue;
 294                         }
 295                         if (!strncmp(arg, "--until=", 8)) {
 296                                 show_datestring("--min-age=", arg+8);
 297                                 continue;
 298                         }
 299                         if (verify)
 300                                 die("Needed a single revision");
 301                         show_flag(arg);
 302                         continue;
 303                 }
 304
 305                 /* Not a flag argument */
 306                 dotdot = strstr(arg, "..");
 307                 if (dotdot) {
 308                         unsigned char end[20];
 309                         char *n = dotdot+2;
 310                         *dotdot = 0;
 311                         if (!get_sha1(arg, sha1)) {
 312                                 if (!*n)
 313                                         n = "HEAD";
 314                                 if (!get_sha1(n, end)) {
 315                                         show_rev(NORMAL, end, n);
 316                                         show_rev(REVERSED, sha1, arg);
 317                                         continue;
 318                                 }
 319                         }
 320                         *dotdot = '.';
 321                 }
 322                 if (!get_sha1(arg, sha1)) {
 323                         show_rev(NORMAL, sha1, arg);
 324                         continue;
 325                 }
 326                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 327                         show_rev(REVERSED, sha1, arg+1);
 328                         continue;
 329                 }
 330                 if (verify)
 331                         die("Needed a single revision");
 332                 if ((filter & DO_REVS) &&
 333                     (filter & DO_NONFLAGS) && /* !def && */
 334                     lstat(arg, &st) < 0)
 335                         die("'%s': %s", arg, strerror(errno));
 336                 as_is = 1;
 337                 show_file(arg);
 338         }
 339         show_default();
 340         if (verify && revs_count != 1)
 341                 die("Needed a single revision");
 342         return 0;
 343 }