index.js
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'use strict';
var childProcess = require('child_process');
var execFileSync = childProcess.execFileSync;
var lcid = require('lcid');
var defaultOpts = {spawn: true};
var cache;
function fallback() {
cache = 'en_US';
return cache;
}
function getEnvLocale(env) {
env = env || process.env;
var ret = env.LC_ALL || env.LC_MESSAGES || env.LANG || env.LANGUAGE;
cache = getLocale(ret);
return ret;
}
function parseLocale(x) {
var env = x.split('\n').reduce(function (env, def) {
def = def.split('=');
env[def[0]] = def[1];
return env;
}, {});
return getEnvLocale(env);
}
function getLocale(str) {
return (str && str.replace(/[.:].*/, '')) || fallback();
}
module.exports = function (opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = defaultOpts;
} else {
opts = opts || defaultOpts;
}
if (cache || getEnvLocale() || opts.spawn === false) {
setImmediate(cb, null, cache);
return;
}
var getAppleLocale = function () {
childProcess.execFile('defaults', ['read', '-g', 'AppleLocale'], function (err, stdout) {
if (err) {
fallback();
return;
}
cache = stdout.trim() || fallback();
cb(null, cache);
});
};
if (process.platform === 'win32') {
childProcess.execFile('wmic', ['os', 'get', 'locale'], function (err, stdout) {
if (err) {
fallback();
return;
}
var lcidCode = parseInt(stdout.replace('Locale', ''), 16);
cache = lcid.from(lcidCode) || fallback();
cb(null, cache);
});
} else {
childProcess.execFile('locale', function (err, stdout) {
if (err) {
fallback();
return;
}
var res = parseLocale(stdout);
if (!res && process.platform === 'darwin') {
getAppleLocale();
return;
}
cache = getLocale(res);
cb(null, cache);
});
}
};
module.exports.sync = function (opts) {
opts = opts || defaultOpts;
if (cache || getEnvLocale() || !execFileSync || opts.spawn === false) {
return cache;
}
if (process.platform === 'win32') {
var stdout;
try {
stdout = execFileSync('wmic', ['os', 'get', 'locale'], {encoding: 'utf8'});
} catch (err) {
return fallback();
}
var lcidCode = parseInt(stdout.replace('Locale', ''), 16);
cache = lcid.from(lcidCode) || fallback();
return cache;
}
var res;
try {
res = parseLocale(execFileSync('locale', {encoding: 'utf8'}));
} catch (err) {}
if (!res && process.platform === 'darwin') {
try {
cache = execFileSync('defaults', ['read', '-g', 'AppleLocale'], {encoding: 'utf8'}).trim() || fallback();
return cache;
} catch (err) {
return fallback();
}
}
cache = getLocale(res);
return cache;
};