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                 "--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 static void die_badfile(const char *arg)
 164 {
 165         if (errno != ENOENT)
 166                 die("'%s': %s", arg, strerror(errno));
 167         die("'%s' is ambiguous - revision name or file/directory name?\n"
 168             "Please put '--' before the list of filenames.", arg);
 169 }
 170
 171 int main(int argc, char **argv)
 172 {
 173         int i, as_is = 0, verify = 0;
 174         unsigned char sha1[20];
 175         const char *prefix = setup_git_directory();
 176
 177         git_config(git_default_config);
 178
 179         for (i = 1; i < argc; i++) {
 180                 struct stat st;
 181                 char *arg = argv[i];
 182                 char *dotdot;
 183
 184                 if (as_is) {
 185                         if (show_file(arg) && as_is < 2)
 186                                 if (lstat(arg, &st) < 0)
 187                                         die_badfile(arg);
 188                         continue;
 189                 }
 190                 if (!strcmp(arg,"-n")) {
 191                         if (++i >= argc)
 192                                 die("-n requires an argument");
 193                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 194                                 show(arg);
 195                                 show(argv[i]);
 196                         }
 197                         continue;
 198                 }
 199                 if (!strncmp(arg,"-n",2)) {
 200                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 201                                 show(arg);
 202                         continue;
 203                 }
 204
 205                 if (*arg == '-') {
 206                         if (!strcmp(arg, "--")) {
 207                                 as_is = 2;
 208                                 /* Pass on the "--" if we show anything but files.. */
 209                                 if (filter & (DO_FLAGS | DO_REVS))
 210                                         show_file(arg);
 211                                 continue;
 212                         }
 213                         if (!strcmp(arg, "--default")) {
 214                                 def = argv[i+1];
 215                                 i++;
 216                                 continue;
 217                         }
 218                         if (!strcmp(arg, "--revs-only")) {
 219                                 filter &= ~DO_NOREV;
 220                                 continue;
 221                         }
 222                         if (!strcmp(arg, "--no-revs")) {
 223                                 filter &= ~DO_REVS;
 224                                 continue;
 225                         }
 226                         if (!strcmp(arg, "--flags")) {
 227                                 filter &= ~DO_NONFLAGS;
 228                                 continue;
 229                         }
 230                         if (!strcmp(arg, "--no-flags")) {
 231                                 filter &= ~DO_FLAGS;
 232                                 continue;
 233                         }
 234                         if (!strcmp(arg, "--verify")) {
 235                                 filter &= ~(DO_FLAGS|DO_NOREV);
 236                                 verify = 1;
 237                                 continue;
 238                         }
 239                         if (!strcmp(arg, "--short") ||
 240                             !strncmp(arg, "--short=", 8)) {
 241                                 filter &= ~(DO_FLAGS|DO_NOREV);
 242                                 verify = 1;
 243                                 abbrev = DEFAULT_ABBREV;
 244                                 if (arg[7] == '=')
 245                                         abbrev = strtoul(arg + 8, NULL, 10);
 246                                 if (abbrev < MINIMUM_ABBREV)
 247                                         abbrev = MINIMUM_ABBREV;
 248                                 else if (40 <= abbrev)
 249                                         abbrev = 40;
 250                                 continue;
 251                         }
 252                         if (!strcmp(arg, "--sq")) {
 253                                 output_sq = 1;
 254                                 continue;
 255                         }
 256                         if (!strcmp(arg, "--not")) {
 257                                 show_type ^= REVERSED;
 258                                 continue;
 259                         }
 260                         if (!strcmp(arg, "--symbolic")) {
 261                                 symbolic = 1;
 262                                 continue;
 263                         }
 264                         if (!strcmp(arg, "--all")) {
 265                                 for_each_ref(show_reference);
 266                                 continue;
 267                         }
 268                         if (!strcmp(arg, "--show-prefix")) {
 269                                 if (prefix)
 270                                         puts(prefix);
 271                                 continue;
 272                         }
 273                         if (!strcmp(arg, "--show-cdup")) {
 274                                 const char *pfx = prefix;
 275                                 while (pfx) {
 276                                         pfx = strchr(pfx, '/');
 277                                         if (pfx) {
 278                                                 pfx++;
 279                                                 printf("../");
 280                                         }
 281                                 }
 282                                 putchar('\n');
 283                                 continue;
 284                         }
 285                         if (!strcmp(arg, "--git-dir")) {
 286                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 287                                 static char cwd[PATH_MAX];
 288                                 if (gitdir) {
 289                                         puts(gitdir);
 290                                         continue;
 291                                 }
 292                                 if (!prefix) {
 293                                         puts(".git");
 294                                         continue;
 295                                 }
 296                                 if (!getcwd(cwd, PATH_MAX))
 297                                         die("unable to get current working directory");
 298                                 printf("%s/.git\n", cwd);
 299                                 continue;
 300                         }
 301                         if (!strncmp(arg, "--since=", 8)) {
 302                                 show_datestring("--max-age=", arg+8);
 303                                 continue;
 304                         }
 305                         if (!strncmp(arg, "--after=", 8)) {
 306                                 show_datestring("--max-age=", arg+8);
 307                                 continue;
 308                         }
 309                         if (!strncmp(arg, "--before=", 9)) {
 310                                 show_datestring("--min-age=", arg+9);
 311                                 continue;
 312                         }
 313                         if (!strncmp(arg, "--until=", 8)) {
 314                                 show_datestring("--min-age=", arg+8);
 315                                 continue;
 316                         }
 317                         if (show_flag(arg) && verify)
 318                                 die("Needed a single revision");
 319                         continue;
 320                 }
 321
 322                 /* Not a flag argument */
 323                 dotdot = strstr(arg, "..");
 324                 if (dotdot) {
 325                         unsigned char end[20];
 326                         char *next = dotdot + 2;
 327                         char *this = arg;
 328                         *dotdot = 0;
 329                         if (!*next)
 330                                 next = "HEAD";
 331                         if (dotdot == arg)
 332                                 this = "HEAD";
 333                         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 334                                 show_rev(NORMAL, end, next);
 335                                 show_rev(REVERSED, sha1, this);
 336                                 continue;
 337                         }
 338                         *dotdot = '.';
 339                 }
 340                 if (!get_sha1(arg, sha1)) {
 341                         show_rev(NORMAL, sha1, arg);
 342                         continue;
 343                 }
 344                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 345                         show_rev(REVERSED, sha1, arg+1);
 346                         continue;
 347                 }
 348                 as_is = 1;
 349                 if (!show_file(arg))
 350                         continue;
 351                 if (verify)
 352                         die("Needed a single revision");
 353                 if (lstat(arg, &st) < 0)
 354                         die_badfile(arg);
 355         }
 356         show_default();
 357         if (verify && revs_count != 1)
 358                 die("Needed a single revision");
 359         return 0;
 360 }