builtin/env--helper.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "parse-options.h"
   4
   5 static char const * const env__helper_usage[] = {
   6         N_("git env--helper --type=[bool|ulong] <options> <env-var>"),
   7         NULL
   8 };
   9
  10 static enum {
  11         ENV_HELPER_TYPE_BOOL = 1,
  12         ENV_HELPER_TYPE_ULONG
  13 } cmdmode = 0;
  14
  15 static int option_parse_type(const struct option *opt, const char *arg,
  16                              int unset)
  17 {
  18         if (!strcmp(arg, "bool"))
  19                 cmdmode = ENV_HELPER_TYPE_BOOL;
  20         else if (!strcmp(arg, "ulong"))
  21                 cmdmode = ENV_HELPER_TYPE_ULONG;
  22         else
  23                 die(_("unrecognized --type argument, %s"), arg);
  24
  25         return 0;
  26 }
  27
  28 int cmd_env__helper(int argc, const char **argv, const char *prefix)
  29 {
  30         int exit_code = 0;
  31         const char *env_variable = NULL;
  32         const char *env_default = NULL;
  33         int ret;
  34         int ret_int, default_int;
  35         unsigned long ret_ulong, default_ulong;
  36         struct option opts[] = {
  37                 OPT_CALLBACK_F(0, "type", &cmdmode, N_("type"),
  38                                N_("value is given this type"), PARSE_OPT_NONEG,
  39                                option_parse_type),
  40                 OPT_STRING(0, "default", &env_default, N_("value"),
  41                            N_("default for git_env_*(...) to fall back on")),
  42                 OPT_BOOL(0, "exit-code", &exit_code,
  43                          N_("be quiet only use git_env_*() value as exit code")),
  44                 OPT_END(),
  45         };
  46
  47         argc = parse_options(argc, argv, prefix, opts, env__helper_usage,
  48                              PARSE_OPT_KEEP_UNKNOWN);
  49         if (env_default && !*env_default)
  50                 usage_with_options(env__helper_usage, opts);
  51         if (!cmdmode)
  52                 usage_with_options(env__helper_usage, opts);
  53         if (argc != 1)
  54                 usage_with_options(env__helper_usage, opts);
  55         env_variable = argv[0];
  56
  57         switch (cmdmode) {
  58         case ENV_HELPER_TYPE_BOOL:
  59                 if (env_default) {
  60                         default_int = git_parse_maybe_bool(env_default);
  61                         if (default_int == -1) {
  62                                 error(_("option `--default' expects a boolean value with `--type=bool`, not `%s`"),
  63                                       env_default);
  64                                 usage_with_options(env__helper_usage, opts);
  65                         }
  66                 } else {
  67                         default_int = 0;
  68                 }
  69                 ret_int = git_env_bool(env_variable, default_int);
  70                 if (!exit_code)
  71                         puts(ret_int ? "true" : "false");
  72                 ret = ret_int;
  73                 break;
  74         case ENV_HELPER_TYPE_ULONG:
  75                 if (env_default) {
  76                         if (!git_parse_ulong(env_default, &default_ulong)) {
  77                                 error(_("option `--default' expects an unsigned long value with `--type=ulong`, not `%s`"),
  78                                       env_default);
  79                                 usage_with_options(env__helper_usage, opts);
  80                         }
  81                 } else {
  82                         default_ulong = 0;
  83                 }
  84                 ret_ulong = git_env_ulong(env_variable, default_ulong);
  85                 if (!exit_code)
  86                         printf("%lu\n", ret_ulong);
  87                 ret = ret_ulong;
  88                 break;
  89         default:
  90                 BUG("unknown <type> value");
  91                 break;
  92         }
  93
  94         return !ret;
  95 }