Improve non detection & docs

README.md

@@ -50,7 +50,6 @@ popd () { builtin popd "$@" && chpwd; }
 
 chpwd () {
   local PKG
-
   PKG=$PWD/package.json
   if [ -f "$PKG" ] && [ "$NODENGINE_LAST_DIR" != "$PWD" ]; then
     nodengine
@@ -64,7 +63,7 @@ chpwd () {
 
 The program use a local cache for avoid fetching versions of node all the time.
 
-By default, new versions of node will be fetch each 5 days.
+By default, new versions of node will be fetched after 5 days.
 
 You can setup the interval using `NODENGINE_INTERVAL`
 

bin/config.js

@@ -1,7 +1,7 @@
 'use strict'
 
-var FIVE_DAYS = 1000 * 60 * 60 * 24 * 5
 var pkg = require('../package.json')
+var FIVE_DAYS = 1000 * 60 * 60 * 24 * 5
 
 require('update-notifier')({pkg: pkg}).notify()
 

bin/fetch.js

@@ -1,7 +1,7 @@
 'use strict'
 
-var URL = 'https://semver.io/node/versions'
 var get = require('simple-get')
+var URL = 'https://semver.io/node/versions'
 
 function fetch (cb) {
   get.concat(URL, function (err, res, data) {

bin/help.txt

@@ -0,0 +1,24 @@
+When you run the command, automagically it switches your node runtime
+based in the `engines.node` field declared at `package.json`
+of the project.
+
+If the `package.json` or `engines.node` doesn't exists, nothing happens.
+
+Usage
+  $ nodengine
+
+Flags
+  NODENGINE_INTERVAL
+    Local cache for keep a list of all node versions to be resolved.
+
+    The list, by default, is fetched after 5 days.
+
+    You can setup a custom intervaling passing a milliseconds number.
+    For example, if you want to force download the list of all node
+    versions just pass a 0:
+
+    NODENGINE_INTERVAL=0 nodengine
+
+Examples
+  $ nodengine
+  $ NODENGINE_INTERVAL=0 nodengine

bin/index.js

@@ -2,36 +2,16 @@
 
 'use strict'
 
-require('meow')(require('../package.json'))
-
-var waterfall = require('async').waterfall
-var semver = require('semver')
 var path = require('path')
+var fs = require('fs')
 
-var config = require('./config')
-var createSwitcher = require('./switcher')
-
-var pkg = require(path.resolve('package.json'))
-var rangeVersion = pkg.engines && pkg.engines.node
-
-if (!rangeVersion) process.exit()
-
-var tasks = [
-  function loadConfig (next) {
-    return config(next)
-  },
-  function getSwitcher (versions, next) {
-    var currentVersion = process.versions.node
-    var maxSatisfyVersion = semver.maxSatisfying(versions, rangeVersion)
-    var switcher = createSwitcher(maxSatisfyVersion, currentVersion)
+require('meow')({
+  pkg: require(path.resolve(__dirname, '../package.json')),
+  help: fs.readFileSync(path.resolve(__dirname, './help.txt'), 'utf8')
+})
 
-    switcher.getBin(function (err, bin) {
-      return next(err, switcher, bin)
-    })
-  }
-]
+var pkgPath = path.resolve('package.json')
+var pkg = fs.existsSync(pkgPath) ? require(pkgPath) : {}
+var nodeVersion = pkg.engines && pkg.engines.node
 
-waterfall(tasks, function (err, switcher, bin) {
-  if (err) throw err
-  if (bin) return switcher.spawn(bin)
-})
+!nodeVersion ? process.exit() : require('./switch')(nodeVersion)

bin/switch.js

@@ -0,0 +1,31 @@
+'use strict'
+
+var waterfall = require('async').waterfall
+var semver = require('semver')
+
+function _switch (nodeVersion) {
+  var createSwitcher = require('./switcher')
+  var config = require('./config')
+
+  var tasks = [
+    function loadConfig (next) {
+      return config(next)
+    },
+    function getSwitcher (versions, next) {
+      var currentVersion = process.versions.node
+      var maxSatisfyVersion = semver.maxSatisfying(versions, nodeVersion)
+      var switcher = createSwitcher(maxSatisfyVersion, currentVersion)
+
+      switcher.getBin(function (err, bin) {
+        return next(err, switcher, bin)
+      })
+    }
+  ]
+
+  waterfall(tasks, function (err, switcher, bin) {
+    if (err) throw err
+    if (bin) return switcher.spawn(bin)
+  })
+}
+
+module.exports = _switch

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nodengine",
-  "description": "NodeJS switcher based on package.json.",
+  "description": "NodeJS switcher based on node version declared in `package.json`.",
   "homepage": "https://github.com/Kikobeats/nodengine",
   "version": "3.1.0",
   "bin": {