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