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 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                 "--all",
  36                 "--bisect",
  37                 "--header",
  38                 "--max-age=",
  39                 "--max-count=",
  40                 "--merge-order",
  41                 "--min-age=",
  42                 "--no-merges",
  43                 "--objects",
  44                 "--parents",
  45                 "--pretty",
  46                 "--show-breaks",
  47                 "--topo-order",
  48                 "--unpacked",
  49                 NULL
  50         };
  51         const char **p = rev_args;
  52
  53         for (;;) {
  54                 const char *str = *p++;
  55                 int len;
  56                 if (!str)
  57                         return 0;
  58                 len = strlen(str);
  59                 if (!strcmp(arg, str) ||
  60                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  61                         return 1;
  62         }
  63 }
  64
  65 /* Output argument as a string, either SQ or normal */
  66 static void show(const char *arg)
  67 {
  68         if (output_sq) {
  69                 int sq = '\'', ch;
  70
  71                 putchar(sq);
  72                 while ((ch = *arg++)) {
  73                         if (ch == sq)
  74                                 fputs("'\\'", stdout);
  75                         putchar(ch);
  76                 }
  77                 putchar(sq);
  78                 putchar(' ');
  79         }
  80         else
  81                 puts(arg);
  82 }
  83
  84 /* Output a revision, only if filter allows it */
  85 static void show_rev(int type, const unsigned char *sha1, const char *name)
  86 {
  87         if (!(filter & DO_REVS))
  88                 return;
  89         def = NULL;
  90         revs_count++;
  91
  92         if (type != show_type)
  93                 putchar('^');
  94         if (symbolic && name)
  95                 show(name);
  96         else
  97                 show(sha1_to_hex(sha1));
  98 }
  99
 100 /* Output a flag, only if filter allows it. */
 101 static void show_flag(char *arg)
 102 {
 103         if (!(filter & DO_FLAGS))
 104                 return;
 105         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
 106                 show(arg);
 107 }
 108
 109 static void show_default(void)
 110 {
 111         char *s = def;
 112
 113         if (s) {
 114                 unsigned char sha1[20];
 115
 116                 def = NULL;
 117                 if (!get_sha1(s, sha1)) {
 118                         show_rev(NORMAL, sha1, s);
 119                         return;
 120                 }
 121         }
 122 }
 123
 124 static int show_reference(const char *refname, const unsigned char *sha1)
 125 {
 126         show_rev(NORMAL, sha1, refname);
 127         return 0;
 128 }
 129
 130 static void show_datestring(const char *flag, const char *datestr)
 131 {
 132         FILE *date;
 133         static char buffer[100];
 134         static char cmd[1000];
 135         int len;
 136
 137         /* date handling requires both flags and revs */
 138         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 139                 return;
 140         len = strlen(flag);
 141         memcpy(buffer, flag, len);
 142
 143         snprintf(cmd, sizeof(cmd), "date --date=%s +%%s", sq_quote(datestr));
 144         date = popen(cmd, "r");
 145         if (!date || !fgets(buffer + len, sizeof(buffer) - len, date))
 146                 die("git-rev-list: bad date string");
 147         pclose(date);
 148         len = strlen(buffer);
 149         if (buffer[len-1] == '\n')
 150                 buffer[--len] = 0;
 151         show(buffer);
 152 }
 153
 154 int main(int argc, char **argv)
 155 {
 156         int i, as_is = 0, verify = 0;
 157         unsigned char sha1[20];
 158         const char *prefix = setup_git_directory();
 159
 160         for (i = 1; i < argc; i++) {
 161                 char *arg = argv[i];
 162                 char *dotdot;
 163
 164                 if (as_is) {
 165                         show(arg);
 166                         continue;
 167                 }
 168                 if (*arg == '-') {
 169                         if (!strcmp(arg, "--")) {
 170                                 as_is = 1;
 171                                 continue;
 172                         }
 173                         if (!strcmp(arg, "--default")) {
 174                                 def = argv[i+1];
 175                                 i++;
 176                                 continue;
 177                         }
 178                         if (!strcmp(arg, "--revs-only")) {
 179                                 filter &= ~DO_NOREV;
 180                                 continue;
 181                         }
 182                         if (!strcmp(arg, "--no-revs")) {
 183                                 filter &= ~DO_REVS;
 184                                 continue;
 185                         }
 186                         if (!strcmp(arg, "--flags")) {
 187                                 filter &= ~DO_NONFLAGS;
 188                                 continue;
 189                         }
 190                         if (!strcmp(arg, "--no-flags")) {
 191                                 filter &= ~DO_FLAGS;
 192                                 continue;
 193                         }
 194                         if (!strcmp(arg, "--verify")) {
 195                                 filter &= ~(DO_FLAGS|DO_NOREV);
 196                                 verify = 1;
 197                                 continue;
 198                         }
 199                         if (!strcmp(arg, "--sq")) {
 200                                 output_sq = 1;
 201                                 continue;
 202                         }
 203                         if (!strcmp(arg, "--not")) {
 204                                 show_type ^= REVERSED;
 205                                 continue;
 206                         }
 207                         if (!strcmp(arg, "--symbolic")) {
 208                                 symbolic = 1;
 209                                 continue;
 210                         }
 211                         if (!strcmp(arg, "--all")) {
 212                                 for_each_ref(show_reference);
 213                                 continue;
 214                         }
 215                         if (!strcmp(arg, "--show-prefix")) {
 216                                 if (prefix)
 217                                         puts(prefix);
 218                                 continue;
 219                         }
 220                         if (!strcmp(arg, "--git-dir")) {
 221                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 222                                 static char cwd[PATH_MAX];
 223                                 if (gitdir) {
 224                                         puts(gitdir);
 225                                         continue;
 226                                 }
 227                                 if (!prefix) {
 228                                         puts(".git");
 229                                         continue;
 230                                 }
 231                                 if (!getcwd(cwd, PATH_MAX))
 232                                         die("unable to get current working directory");
 233                                 printf("%s/.git\n", cwd);
 234                                 continue;
 235                         }
 236                         if (!strncmp(arg, "--since=", 8)) {
 237                                 show_datestring("--max-age=", arg+8);
 238                                 continue;
 239                         }
 240                         if (!strncmp(arg, "--after=", 8)) {
 241                                 show_datestring("--max-age=", arg+8);
 242                                 continue;
 243                         }
 244                         if (!strncmp(arg, "--before=", 9)) {
 245                                 show_datestring("--min-age=", arg+9);
 246                                 continue;
 247                         }
 248                         if (!strncmp(arg, "--until=", 8)) {
 249                                 show_datestring("--min-age=", arg+8);
 250                                 continue;
 251                         }
 252                         if (verify)
 253                                 die("Needed a single revision");
 254                         show_flag(arg);
 255                         continue;
 256                 }
 257
 258                 /* Not a flag argument */
 259                 dotdot = strstr(arg, "..");
 260                 if (dotdot) {
 261                         unsigned char end[20];
 262                         char *n = dotdot+2;
 263                         *dotdot = 0;
 264                         if (!get_sha1(arg, sha1)) {
 265                                 if (!*n)
 266                                         n = "HEAD";
 267                                 if (!get_sha1(n, end)) {
 268                                         show_rev(NORMAL, end, n);
 269                                         show_rev(REVERSED, sha1, arg);
 270                                         continue;
 271                                 }
 272                         }
 273                         *dotdot = '.';
 274                 }
 275                 if (!get_sha1(arg, sha1)) {
 276                         show_rev(NORMAL, sha1, arg);
 277                         continue;
 278                 }
 279                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 280                         show_rev(REVERSED, sha1, arg+1);
 281                         continue;
 282                 }
 283                 if (verify)
 284                         die("Needed a single revision");
 285                 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
 286                     (DO_NONFLAGS|DO_NOREV))
 287                         show(arg);
 288         }
 289         show_default();
 290         if (verify && revs_count != 1)
 291                 die("Needed a single revision");
 292         return 0;
 293 }