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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 output_sq = 0;
  24
  25 static int revs_count = 0;
  26
  27 /*
  28  * Some arguments are relevant "revision" arguments,
  29  * others are about output format or other details.
  30  * This sorts it all out.
  31  */
  32 static int is_rev_argument(const char *arg)
  33 {
  34         static const char *rev_args[] = {
  35                 "--bisect",
  36                 "--header",
  37                 "--max-age=",
  38                 "--max-count=",
  39                 "--merge-order",
  40                 "--min-age=",
  41                 "--no-merges",
  42                 "--objects",
  43                 "--parents",
  44                 "--pretty",
  45                 "--show-breaks",
  46                 "--topo-order",
  47                 "--unpacked",
  48                 NULL
  49         };
  50         const char **p = rev_args;
  51
  52         for (;;) {
  53                 const char *str = *p++;
  54                 int len;
  55                 if (!str)
  56                         return 0;
  57                 len = strlen(str);
  58                 if (!strcmp(arg, str) ||
  59                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  60                         return 1;
  61         }
  62 }
  63
  64 /* Output argument as a string, either SQ or normal */
  65 static void show(const char *arg)
  66 {
  67         if (output_sq) {
  68                 int sq = '\'', ch;
  69
  70                 putchar(sq);
  71                 while ((ch = *arg++)) {
  72                         if (ch == sq)
  73                                 fputs("'\\'", stdout);
  74                         putchar(ch);
  75                 }
  76                 putchar(sq);
  77                 putchar(' ');
  78         }
  79         else
  80                 puts(arg);
  81 }
  82
  83 /* Output a revision, only if filter allows it */
  84 static void show_rev(int type, const unsigned char *sha1, const char *name)
  85 {
  86         if (!(filter & DO_REVS))
  87                 return;
  88         def = NULL;
  89         revs_count++;
  90
  91         if (type != show_type)
  92                 putchar('^');
  93         if (symbolic && name)
  94                 show(name);
  95         else
  96                 show(sha1_to_hex(sha1));
  97 }
  98
  99 /* Output a flag, only if filter allows it. */
 100 static void show_flag(char *arg)
 101 {
 102         if (!(filter & DO_FLAGS))
 103                 return;
 104         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
 105                 show(arg);
 106 }
 107
 108 static void show_default(void)
 109 {
 110         char *s = def;
 111
 112         if (s) {
 113                 unsigned char sha1[20];
 114
 115                 def = NULL;
 116                 if (!get_sha1(s, sha1)) {
 117                         show_rev(NORMAL, sha1, s);
 118                         return;
 119                 }
 120         }
 121 }
 122
 123 static int show_reference(const char *refname, const unsigned char *sha1)
 124 {
 125         show_rev(NORMAL, sha1, refname);
 126         return 0;
 127 }
 128
 129 static void show_datestring(const char *flag, const char *datestr)
 130 {
 131         FILE *date;
 132         static char buffer[100];
 133         static char cmd[1000];
 134         int len;
 135
 136         /* date handling requires both flags and revs */
 137         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 138                 return;
 139         len = strlen(flag);
 140         memcpy(buffer, flag, len);
 141
 142         snprintf(cmd, sizeof(cmd), "date --date=%s +%%s", sq_quote(datestr));
 143         date = popen(cmd, "r");
 144         if (!date || !fgets(buffer + len, sizeof(buffer) - len, date))
 145                 die("git-rev-list: bad date string");
 146         pclose(date);
 147         len = strlen(buffer);
 148         if (buffer[len-1] == '\n')
 149                 buffer[--len] = 0;
 150         show(buffer);
 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                 char *arg = argv[i];
 161                 char *dotdot;
 162
 163                 if (as_is) {
 164                         show(arg);
 165                         continue;
 166                 }
 167                 if (*arg == '-') {
 168                         if (!strcmp(arg, "--")) {
 169                                 as_is = 1;
 170                                 continue;
 171                         }
 172                         if (!strcmp(arg, "--default")) {
 173                                 def = argv[i+1];
 174                                 i++;
 175                                 continue;
 176                         }
 177                         if (!strcmp(arg, "--revs-only")) {
 178                                 filter &= ~DO_NOREV;
 179                                 continue;
 180                         }
 181                         if (!strcmp(arg, "--no-revs")) {
 182                                 filter &= ~DO_REVS;
 183                                 continue;
 184                         }
 185                         if (!strcmp(arg, "--flags")) {
 186                                 filter &= ~DO_NONFLAGS;
 187                                 continue;
 188                         }
 189                         if (!strcmp(arg, "--no-flags")) {
 190                                 filter &= ~DO_FLAGS;
 191                                 continue;
 192                         }
 193                         if (!strcmp(arg, "--verify")) {
 194                                 filter &= ~(DO_FLAGS|DO_NOREV);
 195                                 verify = 1;
 196                                 continue;
 197                         }
 198                         if (!strcmp(arg, "--sq")) {
 199                                 output_sq = 1;
 200                                 continue;
 201                         }
 202                         if (!strcmp(arg, "--not")) {
 203                                 show_type ^= REVERSED;
 204                                 continue;
 205                         }
 206                         if (!strcmp(arg, "--symbolic")) {
 207                                 symbolic = 1;
 208                                 continue;
 209                         }
 210                         if (!strcmp(arg, "--all")) {
 211                                 for_each_ref(show_reference);
 212                                 continue;
 213                         }
 214                         if (!strcmp(arg, "--show-prefix")) {
 215                                 if (prefix)
 216                                         puts(prefix);
 217                                 continue;
 218                         }
 219                         if (!strcmp(arg, "--git-dir")) {
 220                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 221                                 static char cwd[PATH_MAX];
 222                                 if (gitdir) {
 223                                         puts(gitdir);
 224                                         continue;
 225                                 }
 226                                 if (!prefix) {
 227                                         puts(".git");
 228                                         continue;
 229                                 }
 230                                 if (!getcwd(cwd, PATH_MAX))
 231                                         die("unable to get current working directory");
 232                                 printf("%s/.git\n", cwd);
 233                                 continue;
 234                         }
 235                         if (!strncmp(arg, "--since=", 8)) {
 236                                 show_datestring("--max-age=", arg+8);
 237                                 continue;
 238                         }
 239                         if (!strncmp(arg, "--after=", 8)) {
 240                                 show_datestring("--max-age=", arg+8);
 241                                 continue;
 242                         }
 243                         if (!strncmp(arg, "--before=", 9)) {
 244                                 show_datestring("--min-age=", arg+9);
 245                                 continue;
 246                         }
 247                         if (!strncmp(arg, "--until=", 8)) {
 248                                 show_datestring("--min-age=", arg+8);
 249                                 continue;
 250                         }
 251                         if (verify)
 252                                 die("Needed a single revision");
 253                         show_flag(arg);
 254                         continue;
 255                 }
 256
 257                 /* Not a flag argument */
 258                 dotdot = strstr(arg, "..");
 259                 if (dotdot) {
 260                         unsigned char end[20];
 261                         char *n = dotdot+2;
 262                         *dotdot = 0;
 263                         if (!get_sha1(arg, sha1)) {
 264                                 if (!*n)
 265                                         n = "HEAD";
 266                                 if (!get_sha1(n, end)) {
 267                                         show_rev(NORMAL, end, n);
 268                                         show_rev(REVERSED, sha1, arg);
 269                                         continue;
 270                                 }
 271                         }
 272                         *dotdot = '.';
 273                 }
 274                 if (!get_sha1(arg, sha1)) {
 275                         show_rev(NORMAL, sha1, arg);
 276                         continue;
 277                 }
 278                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 279                         show_rev(REVERSED, sha1, arg+1);
 280                         continue;
 281                 }
 282                 if (verify)
 283                         die("Needed a single revision");
 284                 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
 285                     (DO_NONFLAGS|DO_NOREV))
 286                         show(arg);
 287         }
 288         show_default();
 289         if (verify && revs_count != 1)
 290                 die("Needed a single revision");
 291         return 0;
 292 }