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