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/*!
* global-prefix <https://github.com/jonschlinkert/global-prefix>
*
* Copyright (c) 2015-present Jon Schlinkert.
* Licensed under the MIT license.
*/
'use strict';
const fs = require('fs');
const os = require('os');
const path = require('path');
const ini = require('ini');
let prefix;
const getPrefix = () => {
if (process.env.PREFIX) return process.env.PREFIX;
if (prefix) return prefix;
// Start by checking if the global prefix is set by the user
let home = os.homedir();
// os.homedir() returns undefined if $HOME is not set; path.resolve requires strings
if (home) {
prefix = tryConfigPath(path.resolve(home, '.npmrc'));
}
if (prefix) {
return prefix;
}
// Otherwise find the path of npm
let npm = tryNpmPath();
if (npm) {
// Check the built-in npm config file
prefix = tryConfigPath(path.resolve(npm, '..', '..', 'npmrc'));
if (prefix) {
// Now the global npm config can also be checked.
prefix = tryConfigPath(path.resolve(prefix, 'etc', 'npmrc')) || prefix;
}
}
if (!prefix) {
let { APPDATA, DESTDIR, OSTYPE } = process.env;
// c:\node\node.exe --> prefix=c:\node\
if (process.platform === 'win32' || OSTYPE === 'msys' || OSTYPE === 'cygwin') {
prefix = APPDATA ? path.join(APPDATA, 'npm') : path.dirname(process.execPath);
return prefix;
}
// /usr/local/bin/node --> prefix=/usr/local
prefix = path.dirname(path.dirname(process.execPath));
// destdir only is respected on Unix
if (DESTDIR) {
prefix = path.join(DESTDIR, prefix);
}
}
return prefix;
}
function tryNpmPath() {
try {
return fs.realpathSync(require('which').sync('npm'));
} catch (err) { /* do nothing */ }
}
function tryConfigPath(configPath) {
try {
return ini.parse(fs.readFileSync(configPath, 'utf-8')).prefix;
} catch (err) { /* do nothing */ }
}
/**
* Expose `prefix`
*/
Reflect.defineProperty(module, 'exports', {
get() {
return getPrefix();
}
});
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