Andrew's git - gitweb.git/blob - builtin/env--helper.c

   1#include "builtin.h"
   2#include "config.h"
   3#include "parse-options.h"
   4
   5static char const * const env__helper_usage[] = {
   6        N_("git env--helper --type=[bool|ulong] <options> <env-var>"),
   7        NULL
   8};
   9
  10static enum {
  11        ENV_HELPER_TYPE_BOOL = 1,
  12        ENV_HELPER_TYPE_ULONG
  13} cmdmode = 0;
  14
  15static 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
  28int 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}