1 var isWindows = process.platform === 'win32'
2 var path = require('path')
3 var exec = require('child_process').exec
4 var osTmpdir = require('os-tmpdir')
5 var osHomedir = require('os-homedir')
7 // looking up envs is a bit costly.
8 // Also, sometimes we want to have a fallback
9 // Pass in a callback to wait for the fallback on failures
10 // After the first lookup, always returns the same thing.
11 function memo (key, lookup, fallback) {
14 exports[key] = function (cb) {
16 if (!val && !fell && !falling && fallback) {
19 exec(fallback, function (er, output, stderr) {
21 if (er) return // oh well, we tried
25 exports[key] = function (cb) {
26 if (cb) process.nextTick(cb.bind(null, null, val))
29 if (cb && !falling) process.nextTick(cb.bind(null, null, val))
34 memo('user', function () {
36 ? process.env.USERDOMAIN + '\\' + process.env.USERNAME
41 memo('prompt', function () {
42 return isWindows ? process.env.PROMPT : process.env.PS1
45 memo('hostname', function () {
46 return isWindows ? process.env.COMPUTERNAME : process.env.HOSTNAME
49 memo('tmpdir', function () {
53 memo('home', function () {
57 memo('path', function () {
58 return (process.env.PATH ||
60 process.env.path).split(isWindows ? ';' : ':')
63 memo('editor', function () {
64 return process.env.EDITOR ||
66 (isWindows ? 'notepad.exe' : 'vi')
69 memo('shell', function () {
70 return isWindows ? process.env.ComSpec || 'cmd'
71 : process.env.SHELL || 'bash'