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