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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                 "--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 static void show_file(const char *arg)
 155 {
 156         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
 157                 show(arg);
 158 }
 159
 160 int main(int argc, char **argv)
 161 {
 162         int i, as_is = 0, verify = 0;
 163         unsigned char sha1[20];
 164         const char *prefix = setup_git_directory();
 165
 166         for (i = 1; i < argc; i++) {
 167                 char *arg = argv[i];
 168                 char *dotdot;
 169
 170                 if (as_is) {
 171                         show_file(arg);
 172                         continue;
 173                 }
 174                 if (*arg == '-') {
 175                         if (!strcmp(arg, "--")) {
 176                                 as_is = 1;
 177                                 continue;
 178                         }
 179                         if (!strcmp(arg, "--default")) {
 180                                 def = argv[i+1];
 181                                 i++;
 182                                 continue;
 183                         }
 184                         if (!strcmp(arg, "--revs-only")) {
 185                                 filter &= ~DO_NOREV;
 186                                 continue;
 187                         }
 188                         if (!strcmp(arg, "--no-revs")) {
 189                                 filter &= ~DO_REVS;
 190                                 continue;
 191                         }
 192                         if (!strcmp(arg, "--flags")) {
 193                                 filter &= ~DO_NONFLAGS;
 194                                 continue;
 195                         }
 196                         if (!strcmp(arg, "--no-flags")) {
 197                                 filter &= ~DO_FLAGS;
 198                                 continue;
 199                         }
 200                         if (!strcmp(arg, "--verify")) {
 201                                 filter &= ~(DO_FLAGS|DO_NOREV);
 202                                 verify = 1;
 203                                 continue;
 204                         }
 205                         if (!strcmp(arg, "--sq")) {
 206                                 output_sq = 1;
 207                                 continue;
 208                         }
 209                         if (!strcmp(arg, "--not")) {
 210                                 show_type ^= REVERSED;
 211                                 continue;
 212                         }
 213                         if (!strcmp(arg, "--symbolic")) {
 214                                 symbolic = 1;
 215                                 continue;
 216                         }
 217                         if (!strcmp(arg, "--all")) {
 218                                 for_each_ref(show_reference);
 219                                 continue;
 220                         }
 221                         if (!strcmp(arg, "--show-prefix")) {
 222                                 if (prefix)
 223                                         puts(prefix);
 224                                 continue;
 225                         }
 226                         if (!strcmp(arg, "--git-dir")) {
 227                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 228                                 static char cwd[PATH_MAX];
 229                                 if (gitdir) {
 230                                         puts(gitdir);
 231                                         continue;
 232                                 }
 233                                 if (!prefix) {
 234                                         puts(".git");
 235                                         continue;
 236                                 }
 237                                 if (!getcwd(cwd, PATH_MAX))
 238                                         die("unable to get current working directory");
 239                                 printf("%s/.git\n", cwd);
 240                                 continue;
 241                         }
 242                         if (!strncmp(arg, "--since=", 8)) {
 243                                 show_datestring("--max-age=", arg+8);
 244                                 continue;
 245                         }
 246                         if (!strncmp(arg, "--after=", 8)) {
 247                                 show_datestring("--max-age=", arg+8);
 248                                 continue;
 249                         }
 250                         if (!strncmp(arg, "--before=", 9)) {
 251                                 show_datestring("--min-age=", arg+9);
 252                                 continue;
 253                         }
 254                         if (!strncmp(arg, "--until=", 8)) {
 255                                 show_datestring("--min-age=", arg+8);
 256                                 continue;
 257                         }
 258                         if (verify)
 259                                 die("Needed a single revision");
 260                         show_flag(arg);
 261                         continue;
 262                 }
 263
 264                 /* Not a flag argument */
 265                 dotdot = strstr(arg, "..");
 266                 if (dotdot) {
 267                         unsigned char end[20];
 268                         char *n = dotdot+2;
 269                         *dotdot = 0;
 270                         if (!get_sha1(arg, sha1)) {
 271                                 if (!*n)
 272                                         n = "HEAD";
 273                                 if (!get_sha1(n, end)) {
 274                                         show_rev(NORMAL, end, n);
 275                                         show_rev(REVERSED, sha1, arg);
 276                                         continue;
 277                                 }
 278                         }
 279                         *dotdot = '.';
 280                 }
 281                 if (!get_sha1(arg, sha1)) {
 282                         show_rev(NORMAL, sha1, arg);
 283                         continue;
 284                 }
 285                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 286                         show_rev(REVERSED, sha1, arg+1);
 287                         continue;
 288                 }
 289                 if (verify)
 290                         die("Needed a single revision");
 291                 show_file(arg);
 292         }
 293         show_default();
 294         if (verify && revs_count != 1)
 295                 die("Needed a single revision");
 296         return 0;
 297 }