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/*!
* global-prefix <https://github.com/jonschlinkert/global-prefix>
*
* Copyright (c) 2015 Jon Schlinkert.
* Licensed under the MIT license.
*/
'use strict';
var fs = require('fs')
var path = require('path');
var osenv = require('osenv');
var ini = require('ini');
var prefix;
if (process.env.PREFIX) {
prefix = process.env.PREFIX;
} else {
// Start by checking if the global prefix is set by the user
var userConfig = path.resolve(osenv.home(), '.npmrc');
prefix = readPrefix(userConfig);
if (!prefix) {
// Otherwise find the path of npm
var npm = npmPath();
if (npm) {
// Check the built-in npm config file
var builtinConfig = path.resolve(npm, '..', '..', 'npmrc');
prefix = readPrefix(builtinConfig);
if (prefix) {
// Now the global npm config can also be checked.
var globalConfig = path.resolve(prefix, 'etc', 'npmrc');
prefix = readPrefix(globalConfig) || prefix;
}
}
if (!prefix) fallback();
}
}
function fallback() {
var isWindows = require('is-windows');
if (isWindows()) {
// c:\node\node.exe --> prefix=c:\node\
prefix = process.env.APPDATA
? path.join(process.env.APPDATA, 'npm')
: path.dirname(process.execPath);
} else {
// /usr/local/bin/node --> prefix=/usr/local
prefix = path.dirname(path.dirname(process.execPath));
// destdir only is respected on Unix
if (process.env.DESTDIR) {
prefix = path.join(process.env.DESTDIR, prefix);
}
}
}
function npmPath() {
try {
return fs.realpathSync(require('which').sync('npm'))
} catch (ex) {
}
return false
}
function readPrefix(configPath) {
try {
var data = fs.readFileSync(configPath, 'utf-8');
var config = ini.parse(data);
if (config.prefix) return config.prefix;
} catch (ex) {
// file not found
}
return false;
}
module.exports = prefix;
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