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
  10 static char *def = NULL;
  11 static int no_revs = 0;
  12 static int single_rev = 0;
  13 static int revs_only = 0;
  14 static int do_rev_argument = 1;
  15 static int output_revs = 0;
  16 static int flags_only = 0;
  17 static int no_flags = 0;
  18 static int output_sq = 0;
  19
  20 #define NORMAL 0
  21 #define REVERSED 1
  22 static int show_type = NORMAL;
  23
  24 /*
  25  * Some arguments are relevant "revision" arguments,
  26  * others are about output format or other details.
  27  * This sorts it all out.
  28  */
  29 static int is_rev_argument(const char *arg)
  30 {
  31         static const char *rev_args[] = {
  32                 "--max-count=",
  33                 "--max-age=",
  34                 "--min-age=",
  35                 "--merge-order",
  36                 "--topo-order",
  37                 "--bisect",
  38                 "--no-merges",
  39                 NULL
  40         };
  41         const char **p = rev_args;
  42
  43         for (;;) {
  44                 const char *str = *p++;
  45                 int len;
  46                 if (!str)
  47                         return 0;
  48                 len = strlen(str);
  49                 if (!strncmp(arg, str, len))
  50                         return 1;
  51         }
  52 }
  53
  54 static void show(const char *arg)
  55 {
  56         if (output_sq) {
  57                 int sq = '\'', ch;
  58
  59                 putchar(sq);
  60                 while ((ch = *arg++)) {
  61                         if (ch == sq)
  62                                 fputs("'\\'", stdout);
  63                         putchar(ch);
  64                 }
  65                 putchar(sq);
  66                 putchar(' ');
  67         }
  68         else
  69                 puts(arg);
  70 }
  71
  72 static void show_rev(int type, const unsigned char *sha1)
  73 {
  74         if (no_revs)
  75                 return;
  76         output_revs++;
  77
  78         /* Hexadecimal string plus possibly a carret;
  79          * this does not have to be quoted even under output_sq.
  80          */
  81         printf("%s%s%c", type == show_type ? "" : "^", sha1_to_hex(sha1),
  82                output_sq ? ' ' : '\n');
  83 }
  84
  85 static void show_rev_arg(char *rev)
  86 {
  87         if (no_revs)
  88                 return;
  89         show(rev);
  90 }
  91
  92 static void show_norev(char *norev)
  93 {
  94         if (flags_only)
  95                 return;
  96         if (revs_only)
  97                 return;
  98         show(norev);
  99 }
 100
 101 static void show_arg(char *arg)
 102 {
 103         if (no_flags)
 104                 return;
 105         if (do_rev_argument && is_rev_argument(arg))
 106                 show_rev_arg(arg);
 107         else
 108                 show_norev(arg);
 109 }
 110
 111 static void show_default(void)
 112 {
 113         char *s = def;
 114
 115         if (s) {
 116                 unsigned char sha1[20];
 117
 118                 def = NULL;
 119                 if (!get_sha1(s, sha1)) {
 120                         show_rev(NORMAL, sha1);
 121                         return;
 122                 }
 123                 show_arg(s);
 124         }
 125 }
 126
 127 static int show_reference(const char *refname, const unsigned char *sha1)
 128 {
 129         show_rev(NORMAL, sha1);
 130         return 0;
 131 }
 132
 133 int main(int argc, char **argv)
 134 {
 135         int i, as_is = 0;
 136         unsigned char sha1[20];
 137         const char *prefix = setup_git_directory();
 138
 139         for (i = 1; i < argc; i++) {
 140                 char *arg = argv[i];
 141                 char *dotdot;
 142
 143                 if (as_is) {
 144                         show_norev(arg);
 145                         continue;
 146                 }
 147                 if (*arg == '-') {
 148                         if (!strcmp(arg, "--")) {
 149                                 show_default();
 150                                 if (revs_only)
 151                                         break;
 152                                 as_is = 1;
 153                         }
 154                         if (!strcmp(arg, "--default")) {
 155                                 def = argv[i+1];
 156                                 i++;
 157                                 continue;
 158                         }
 159                         if (!strcmp(arg, "--revs-only")) {
 160                                 revs_only = 1;
 161                                 continue;
 162                         }
 163                         if (!strcmp(arg, "--no-revs")) {
 164                                 no_revs = 1;
 165                                 continue;
 166                         }
 167                         if (!strcmp(arg, "--flags")) {
 168                                 flags_only = 1;
 169                                 continue;
 170                         }
 171                         if (!strcmp(arg, "--no-flags")) {
 172                                 no_flags = 1;
 173                                 continue;
 174                         }
 175                         if (!strcmp(arg, "--verify")) {
 176                                 revs_only = 1;
 177                                 do_rev_argument = 0;
 178                                 single_rev = 1;
 179                                 continue;
 180                         }
 181                         if (!strcmp(arg, "--sq")) {
 182                                 output_sq = 1;
 183                                 continue;
 184                         }
 185                         if (!strcmp(arg, "--not")) {
 186                                 show_type ^= REVERSED;
 187                                 continue;
 188                         }
 189                         if (!strcmp(arg, "--all")) {
 190                                 for_each_ref(show_reference);
 191                                 continue;
 192                         }
 193                         if (!strcmp(arg, "--show-prefix")) {
 194                                 puts(prefix);
 195                                 continue;
 196                         }
 197                         show_arg(arg);
 198                         continue;
 199                 }
 200                 dotdot = strstr(arg, "..");
 201                 if (dotdot) {
 202                         unsigned char end[20];
 203                         char *n = dotdot+2;
 204                         *dotdot = 0;
 205                         if (!get_sha1(arg, sha1)) {
 206                                 if (!*n)
 207                                         n = "HEAD";
 208                                 if (!get_sha1(n, end)) {
 209                                         if (no_revs)
 210                                                 continue;
 211                                         def = NULL;
 212                                         show_rev(NORMAL, end);
 213                                         show_rev(REVERSED, sha1);
 214                                         continue;
 215                                 }
 216                         }
 217                         *dotdot = '.';
 218                 }
 219                 if (!get_sha1(arg, sha1)) {
 220                         if (no_revs)
 221                                 continue;
 222                         def = NULL;
 223                         show_rev(NORMAL, sha1);
 224                         continue;
 225                 }
 226                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
 227                         if (no_revs)
 228                                 continue;
 229                         def = NULL;
 230                         show_rev(REVERSED, sha1);
 231                         continue;
 232                 }
 233                 show_default();
 234                 show_norev(arg);
 235         }
 236         show_default();
 237         if (single_rev && output_revs != 1) {
 238                 fprintf(stderr, "Needed a single revision\n");
 239                 exit(1);
 240         }
 241         return 0;
 242 }