builtin-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 #include "builtin.h"
  11
  12 #define DO_REVS         1
  13 #define DO_NOREV        2
  14 #define DO_FLAGS        4
  15 #define DO_NONFLAGS     8
  16 static int filter = ~0;
  17
  18 static const char *def = NULL;
  19
  20 #define NORMAL 0
  21 #define REVERSED 1
  22 static int show_type = NORMAL;
  23 static int symbolic = 0;
  24 static int abbrev = 0;
  25 static int output_sq = 0;
  26
  27 static int revs_count = 0;
  28
  29 /*
  30  * Some arguments are relevant "revision" arguments,
  31  * others are about output format or other details.
  32  * This sorts it all out.
  33  */
  34 static int is_rev_argument(const char *arg)
  35 {
  36         static const char *rev_args[] = {
  37                 "--all",
  38                 "--bisect",
  39                 "--dense",
  40                 "--branches",
  41                 "--header",
  42                 "--max-age=",
  43                 "--max-count=",
  44                 "--min-age=",
  45                 "--no-merges",
  46                 "--objects",
  47                 "--objects-edge",
  48                 "--parents",
  49                 "--pretty",
  50                 "--remotes",
  51                 "--sparse",
  52                 "--tags",
  53                 "--topo-order",
  54                 "--date-order",
  55                 "--unpacked",
  56                 NULL
  57         };
  58         const char **p = rev_args;
  59
  60         /* accept -<digit>, like traditional "head" */
  61         if ((*arg == '-') && isdigit(arg[1]))
  62                 return 1;
  63
  64         for (;;) {
  65                 const char *str = *p++;
  66                 int len;
  67                 if (!str)
  68                         return 0;
  69                 len = strlen(str);
  70                 if (!strcmp(arg, str) ||
  71                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  72                         return 1;
  73         }
  74 }
  75
  76 /* Output argument as a string, either SQ or normal */
  77 static void show(const char *arg)
  78 {
  79         if (output_sq) {
  80                 int sq = '\'', ch;
  81
  82                 putchar(sq);
  83                 while ((ch = *arg++)) {
  84                         if (ch == sq)
  85                                 fputs("'\\'", stdout);
  86                         putchar(ch);
  87                 }
  88                 putchar(sq);
  89                 putchar(' ');
  90         }
  91         else
  92                 puts(arg);
  93 }
  94
  95 /* Output a revision, only if filter allows it */
  96 static void show_rev(int type, const unsigned char *sha1, const char *name)
  97 {
  98         if (!(filter & DO_REVS))
  99                 return;
 100         def = NULL;
 101         revs_count++;
 102
 103         if (type != show_type)
 104                 putchar('^');
 105         if (symbolic && name)
 106                 show(name);
 107         else if (abbrev)
 108                 show(find_unique_abbrev(sha1, abbrev));
 109         else
 110                 show(sha1_to_hex(sha1));
 111 }
 112
 113 /* Output a flag, only if filter allows it. */
 114 static int show_flag(const char *arg)
 115 {
 116         if (!(filter & DO_FLAGS))
 117                 return 0;
 118         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 119                 show(arg);
 120                 return 1;
 121         }
 122         return 0;
 123 }
 124
 125 static void show_default(void)
 126 {
 127         const char *s = def;
 128
 129         if (s) {
 130                 unsigned char sha1[20];
 131
 132                 def = NULL;
 133                 if (!get_sha1(s, sha1)) {
 134                         show_rev(NORMAL, sha1, s);
 135                         return;
 136                 }
 137         }
 138 }
 139
 140 static int show_reference(const char *refname, const unsigned char *sha1)
 141 {
 142         show_rev(NORMAL, sha1, refname);
 143         return 0;
 144 }
 145
 146 static void show_datestring(const char *flag, const char *datestr)
 147 {
 148         static char buffer[100];
 149
 150         /* date handling requires both flags and revs */
 151         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 152                 return;
 153         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 154         show(buffer);
 155 }
 156
 157 static int show_file(const char *arg)
 158 {
 159         show_default();
 160         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 161                 show(arg);
 162                 return 1;
 163         }
 164         return 0;
 165 }
 166
 167 static int try_difference(const char *arg)
 168 {
 169         char *dotdot;
 170         unsigned char sha1[20];
 171         unsigned char end[20];
 172         const char *next;
 173         const char *this;
 174         int symmetric;
 175
 176         if (!(dotdot = strstr(arg, "..")))
 177                 return 0;
 178         next = dotdot + 2;
 179         this = arg;
 180         symmetric = (*next == '.');
 181
 182         *dotdot = 0;
 183         next += symmetric;
 184
 185         if (!*next)
 186                 next = "HEAD";
 187         if (dotdot == arg)
 188                 this = "HEAD";
 189         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 190                 show_rev(NORMAL, end, next);
 191                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 192                 if (symmetric) {
 193                         struct commit_list *exclude;
 194                         struct commit *a, *b;
 195                         a = lookup_commit_reference(sha1);
 196                         b = lookup_commit_reference(end);
 197                         exclude = get_merge_bases(a, b, 1);
 198                         while (exclude) {
 199                                 struct commit_list *n = exclude->next;
 200                                 show_rev(REVERSED,
 201                                          exclude->item->object.sha1,NULL);
 202                                 free(exclude);
 203                                 exclude = n;
 204                         }
 205                 }
 206                 return 1;
 207         }
 208         *dotdot = '.';
 209         return 0;
 210 }
 211
 212 int cmd_rev_parse(int argc, const char **argv, char **envp)
 213 {
 214         int i, as_is = 0, verify = 0;
 215         unsigned char sha1[20];
 216         const char *prefix = setup_git_directory();
 217
 218         git_config(git_default_config);
 219
 220         for (i = 1; i < argc; i++) {
 221                 const char *arg = argv[i];
 222
 223                 if (as_is) {
 224                         if (show_file(arg) && as_is < 2)
 225                                 verify_filename(prefix, arg);
 226                         continue;
 227                 }
 228                 if (!strcmp(arg,"-n")) {
 229                         if (++i >= argc)
 230                                 die("-n requires an argument");
 231                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 232                                 show(arg);
 233                                 show(argv[i]);
 234                         }
 235                         continue;
 236                 }
 237                 if (!strncmp(arg,"-n",2)) {
 238                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 239                                 show(arg);
 240                         continue;
 241                 }
 242
 243                 if (*arg == '-') {
 244                         if (!strcmp(arg, "--")) {
 245                                 as_is = 2;
 246                                 /* Pass on the "--" if we show anything but files.. */
 247                                 if (filter & (DO_FLAGS | DO_REVS))
 248                                         show_file(arg);
 249                                 continue;
 250                         }
 251                         if (!strcmp(arg, "--default")) {
 252                                 def = argv[i+1];
 253                                 i++;
 254                                 continue;
 255                         }
 256                         if (!strcmp(arg, "--revs-only")) {
 257                                 filter &= ~DO_NOREV;
 258                                 continue;
 259                         }
 260                         if (!strcmp(arg, "--no-revs")) {
 261                                 filter &= ~DO_REVS;
 262                                 continue;
 263                         }
 264                         if (!strcmp(arg, "--flags")) {
 265                                 filter &= ~DO_NONFLAGS;
 266                                 continue;
 267                         }
 268                         if (!strcmp(arg, "--no-flags")) {
 269                                 filter &= ~DO_FLAGS;
 270                                 continue;
 271                         }
 272                         if (!strcmp(arg, "--verify")) {
 273                                 filter &= ~(DO_FLAGS|DO_NOREV);
 274                                 verify = 1;
 275                                 continue;
 276                         }
 277                         if (!strcmp(arg, "--short") ||
 278                             !strncmp(arg, "--short=", 8)) {
 279                                 filter &= ~(DO_FLAGS|DO_NOREV);
 280                                 verify = 1;
 281                                 abbrev = DEFAULT_ABBREV;
 282                                 if (arg[7] == '=')
 283                                         abbrev = strtoul(arg + 8, NULL, 10);
 284                                 if (abbrev < MINIMUM_ABBREV)
 285                                         abbrev = MINIMUM_ABBREV;
 286                                 else if (40 <= abbrev)
 287                                         abbrev = 40;
 288                                 continue;
 289                         }
 290                         if (!strcmp(arg, "--sq")) {
 291                                 output_sq = 1;
 292                                 continue;
 293                         }
 294                         if (!strcmp(arg, "--not")) {
 295                                 show_type ^= REVERSED;
 296                                 continue;
 297                         }
 298                         if (!strcmp(arg, "--symbolic")) {
 299                                 symbolic = 1;
 300                                 continue;
 301                         }
 302                         if (!strcmp(arg, "--all")) {
 303                                 for_each_ref(show_reference);
 304                                 continue;
 305                         }
 306                         if (!strcmp(arg, "--branches")) {
 307                                 for_each_branch_ref(show_reference);
 308                                 continue;
 309                         }
 310                         if (!strcmp(arg, "--tags")) {
 311                                 for_each_tag_ref(show_reference);
 312                                 continue;
 313                         }
 314                         if (!strcmp(arg, "--remotes")) {
 315                                 for_each_remote_ref(show_reference);
 316                                 continue;
 317                         }
 318                         if (!strcmp(arg, "--show-prefix")) {
 319                                 if (prefix)
 320                                         puts(prefix);
 321                                 continue;
 322                         }
 323                         if (!strcmp(arg, "--show-cdup")) {
 324                                 const char *pfx = prefix;
 325                                 while (pfx) {
 326                                         pfx = strchr(pfx, '/');
 327                                         if (pfx) {
 328                                                 pfx++;
 329                                                 printf("../");
 330                                         }
 331                                 }
 332                                 putchar('\n');
 333                                 continue;
 334                         }
 335                         if (!strcmp(arg, "--git-dir")) {
 336                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 337                                 static char cwd[PATH_MAX];
 338                                 if (gitdir) {
 339                                         puts(gitdir);
 340                                         continue;
 341                                 }
 342                                 if (!prefix) {
 343                                         puts(".git");
 344                                         continue;
 345                                 }
 346                                 if (!getcwd(cwd, PATH_MAX))
 347                                         die("unable to get current working directory");
 348                                 printf("%s/.git\n", cwd);
 349                                 continue;
 350                         }
 351                         if (!strncmp(arg, "--since=", 8)) {
 352                                 show_datestring("--max-age=", arg+8);
 353                                 continue;
 354                         }
 355                         if (!strncmp(arg, "--after=", 8)) {
 356                                 show_datestring("--max-age=", arg+8);
 357                                 continue;
 358                         }
 359                         if (!strncmp(arg, "--before=", 9)) {
 360                                 show_datestring("--min-age=", arg+9);
 361                                 continue;
 362                         }
 363                         if (!strncmp(arg, "--until=", 8)) {
 364                                 show_datestring("--min-age=", arg+8);
 365                                 continue;
 366                         }
 367                         if (show_flag(arg) && verify)
 368                                 die("Needed a single revision");
 369                         continue;
 370                 }
 371
 372                 /* Not a flag argument */
 373                 if (try_difference(arg))
 374                         continue;
 375                 if (!get_sha1(arg, sha1)) {
 376                         show_rev(NORMAL, sha1, arg);
 377                         continue;
 378                 }
 379                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 380                         show_rev(REVERSED, sha1, arg+1);
 381                         continue;
 382                 }
 383                 as_is = 1;
 384                 if (!show_file(arg))
 385                         continue;
 386                 if (verify)
 387                         die("Needed a single revision");
 388                 verify_filename(prefix, arg);
 389         }
 390         show_default();
 391         if (verify && revs_count != 1)
 392                 die("Needed a single revision");
 393         return 0;
 394 }