/
rc.js
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/
rc.js
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var path = require('path');
var fs = require('graceful-fs');
var yargs = require('yargs');
var osenv = require('osenv');
var object = require('mout/object');
var string = require('mout/string');
var paths = require('./paths');
var defaults = require('./defaults');
var win = process.platform === 'win32';
var home = osenv.home();
function rc(name, cwd, argv) {
var argvConfig;
argv = argv || yargs.argv;
// Parse --config.foo=false
argvConfig = object.map(argv.config || {}, function(value) {
return value === 'false' ? false : value;
});
// If we have specified a cwd then use this as the base for getting config.
cwd = argvConfig.cwd ? argvConfig.cwd : cwd;
if (cwd) {
return object.deepMixIn.apply(null, [
{},
defaults,
{ cwd: cwd },
win ? {} : json(path.join('/etc', name + 'rc')),
!home ? {} : json(path.join(home, '.' + name + 'rc')),
json(path.join(paths.config, name + 'rc')),
json(find('.' + name + 'rc', cwd)),
env('npm_package_config_' + name + '_'),
env(name + '_'),
argvConfig
]);
} else {
return object.deepMixIn.apply(null, [
{},
defaults,
win ? {} : json(path.join('/etc', name + 'rc')),
!home ? {} : json(path.join(home, '.' + name + 'rc')),
json(path.join(paths.config, name + 'rc')),
env('npm_package_config_' + name + '_'),
env(name + '_'),
argvConfig
]);
}
}
function parse(content, file) {
var error;
if (!content.trim().length) {
return {};
}
try {
return JSON.parse(content);
} catch (e) {
if (file) {
error = new Error('Unable to parse ' + file + ': ' + e.message);
} else {
error = new Error('Unable to parse rc config: ' + e.message);
}
error.details = content;
error.code = 'EMALFORMED';
throw error;
}
}
function json(file) {
var content = {};
if (!Array.isArray(file)) {
try {
content = fs.readFileSync(file).toString();
} catch (err) {
return null;
}
return parse(content, file);
} else {
// This is multiple json files
file.forEach(function(filename) {
if (fs.statSync(filename).isDirectory()) {
var error;
error = new Error(filename + ' should not be a directory');
error.code = 'EFILEISDIR';
throw error;
}
var json = fs.readFileSync(filename).toString();
json = parse(json, filename);
content = object.merge(content, json);
});
return content;
}
}
function env(prefix) {
var obj = {};
var prefixLength = prefix.length;
prefix = prefix.toLowerCase();
object.forOwn(process.env, function(value, key) {
key = key.toLowerCase();
if (string.startsWith(key, prefix)) {
var parsedKey = key
.substr(prefixLength)
.replace(/__/g, '.') // __ is used for nesting
.replace(/_/g, '-'); // _ is used as a - separator
//use a convention patern to accept array from process.env
//e.g. export bower_registry__search='["http://abc.com","http://def.com"]'
var match = /\[([^\]]*)\]/g.exec(value);
var targetValue;
if (!match || match.length === 0) {
targetValue = value;
} else {
targetValue = match[1].split(',').map(function(m) {
return m.trim();
});
}
object.set(obj, parsedKey, targetValue);
}
});
return obj;
}
function find(filename, dir) {
var files = [];
var walk = function(filename, dir) {
var file = path.join(dir, filename);
var parent = path.dirname(dir);
if (fs.existsSync(file)) {
files.push(file);
}
if (parent !== dir) {
walk(filename, parent);
}
};
walk(filename, dir);
files.reverse();
return files;
}
module.exports = rc;