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var isWindows = process.platform === 'win32'
var path = require('path')
var exec = require('child_process').exec
var os = require('os')
// looking up envs is a bit costly.
// Also, sometimes we want to have a fallback
// Pass in a callback to wait for the fallback on failures
// After the first lookup, always returns the same thing.
function memo (key, lookup, fallback) {
var fell = false
var falling = false
exports[key] = function (cb) {
var val = lookup()
if (!val && !fell && !falling && fallback) {
fell = true
falling = true
exec(fallback, function (er, output, stderr) {
falling = false
if (er) return // oh well, we tried
val = output.trim()
})
}
exports[key] = function (cb) {
if (cb) process.nextTick(cb.bind(null, null, val))
return val
}
if (cb && !falling) process.nextTick(cb.bind(null, null, val))
return val
}
}
memo('user', function () {
return ( isWindows
? process.env.USERDOMAIN + '\\' + process.env.USERNAME
: process.env.USER
)
}, 'whoami')
memo('prompt', function () {
return isWindows ? process.env.PROMPT : process.env.PS1
})
memo('hostname', function () {
return isWindows ? process.env.COMPUTERNAME : process.env.HOSTNAME
}, 'hostname')
memo('tmpdir', function () {
return os.tmpDir()
})
memo('home', function () {
return ( isWindows ? process.env.USERPROFILE
: process.env.HOME
)
})
memo('path', function () {
return (process.env.PATH ||
process.env.Path ||
process.env.path).split(isWindows ? ';' : ':')
})
memo('editor', function () {
return process.env.EDITOR ||
process.env.VISUAL ||
(isWindows ? 'notepad.exe' : 'vi')
})
memo('shell', function () {
return isWindows ? process.env.ComSpec || 'cmd'
: process.env.SHELL || 'bash'
})
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