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97 lines
2.3 KiB
97 lines
2.3 KiB
/*!
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* global-prefix <https://github.com/jonschlinkert/global-prefix>
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*
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* Copyright (c) 2015-2017 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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var fs = require('fs');
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var path = require('path');
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var expand = require('expand-tilde');
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var homedir = require('homedir-polyfill');
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var ini = require('ini');
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var prefix;
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function getPrefix() {
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if (process.env.PREFIX) {
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prefix = process.env.PREFIX;
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} else {
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// Start by checking if the global prefix is set by the user
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var home = homedir();
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if (home) {
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// homedir() returns undefined if $HOME not set; path.resolve requires strings
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var userConfig = path.resolve(home, '.npmrc');
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prefix = tryConfigPath(userConfig);
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}
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if (!prefix) {
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// Otherwise find the path of npm
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var npm = tryNpmPath();
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if (npm) {
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// Check the built-in npm config file
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var builtinConfig = path.resolve(npm, '..', '..', 'npmrc');
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prefix = tryConfigPath(builtinConfig);
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if (prefix) {
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// Now the global npm config can also be checked.
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var globalConfig = path.resolve(prefix, 'etc', 'npmrc');
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prefix = tryConfigPath(globalConfig) || prefix;
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}
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}
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if (!prefix) fallback();
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}
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}
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if (prefix) {
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return expand(prefix);
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}
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}
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function fallback() {
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var isWindows = require('is-windows');
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if (isWindows()) {
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// c:\node\node.exe --> prefix=c:\node\
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prefix = process.env.APPDATA
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? path.join(process.env.APPDATA, 'npm')
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: path.dirname(process.execPath);
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} else {
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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 (process.env.DESTDIR) {
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prefix = path.join(process.env.DESTDIR, prefix);
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}
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}
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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) {}
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return null;
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}
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function tryConfigPath(configPath) {
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try {
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var data = fs.readFileSync(configPath, 'utf-8');
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var config = ini.parse(data);
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if (config.prefix) return config.prefix;
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} catch (err) {}
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return null;
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}
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/**
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* Expose `prefix`
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*/
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Object.defineProperty(module, 'exports', {
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enumerable: true,
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get: function() {
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return prefix || (prefix = getPrefix());
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}
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});
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