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