| /*! |
| * global-prefix <https://github.com/jonschlinkert/global-prefix> |
| * |
| * Copyright (c) 2015-2017 Jon Schlinkert. |
| * Licensed under the MIT license. |
| */ |
| |
| 'use strict'; |
| |
| var fs = require('fs'); |
| var path = require('path'); |
| var expand = require('expand-tilde'); |
| var homedir = require('homedir-polyfill'); |
| var ini = require('ini'); |
| var prefix; |
| |
| function getPrefix() { |
| if (process.env.PREFIX) { |
| prefix = process.env.PREFIX; |
| } else { |
| // Start by checking if the global prefix is set by the user |
| var home = homedir(); |
| if (home) { |
| // homedir() returns undefined if $HOME not set; path.resolve requires strings |
| var userConfig = path.resolve(home, '.npmrc'); |
| prefix = tryConfigPath(userConfig); |
| } |
| |
| if (!prefix) { |
| // Otherwise find the path of npm |
| var npm = tryNpmPath(); |
| if (npm) { |
| // Check the built-in npm config file |
| var builtinConfig = path.resolve(npm, '..', '..', 'npmrc'); |
| prefix = tryConfigPath(builtinConfig); |
| |
| if (prefix) { |
| // Now the global npm config can also be checked. |
| var globalConfig = path.resolve(prefix, 'etc', 'npmrc'); |
| prefix = tryConfigPath(globalConfig) || prefix; |
| } |
| } |
| |
| if (!prefix) fallback(); |
| } |
| } |
| |
| if (prefix) { |
| return expand(prefix); |
| } |
| } |
| |
| 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 tryNpmPath() { |
| try { |
| return fs.realpathSync(require('which').sync('npm')); |
| } catch (err) {} |
| return null; |
| } |
| |
| function tryConfigPath(configPath) { |
| try { |
| var data = fs.readFileSync(configPath, 'utf-8'); |
| var config = ini.parse(data); |
| if (config.prefix) return config.prefix; |
| } catch (err) {} |
| return null; |
| } |
| |
| /** |
| * Expose `prefix` |
| */ |
| |
| Object.defineProperty(module, 'exports', { |
| enumerable: true, |
| get: function() { |
| return prefix || (prefix = getPrefix()); |
| } |
| }); |