| /*! |
| * 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(); |
| } |
| }); |