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