add CLI usage

closes normalize#1

README.md

@@ -17,7 +17,21 @@ But who knows when that's going to happen.
 This uses [`child_process.execFileSync()`](http://nodejs.org/docs/v0.11.13/api/child_process.html#child_process_child_process_execfilesync_command_args_options),
 so is only supported in node `>= v0.11.13`ish.
 
-## Usage
+## CLI Usage
+
+You can install `autoinstall` globally:
+
+```bash
+npm i -g autoinstall
+```
+
+Then use `autoinstall(1)` like `node(1)`:
+
+```bash
+autoinstall index.js
+```
+
+## API Usage
 
 ```bash
 npm i autoinstall

bin/autoinstall

@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+
+var autoinstall = require.resolve('..')
+
+var args = process.argv.slice(2)
+
+var options = []
+args = args.filter(function (arg) {
+  if (arg[0] === '-') {
+    options.push(arg)
+    return false
+  }
+  return true
+})
+
+if (args.length > 1) {
+  throw new Error('more than 1 argument supplied')
+}
+
+var path = require('path')
+var file = path.resolve(args[0])
+
+options.push('-e',
+  "require('" + autoinstall + "');" +
+  "require('" + file + "');"
+)
+
+var spawn = require('child_process').spawn
+var proc = spawn('node', options, {
+  customFds: [0, 1, 2]
+})
+
+proc.on('exit', function (code) {
+  process.exit(code)
+})

package.json

@@ -18,5 +18,6 @@
   },
   "engines": {
     "node": ">= 0.11.13"
-  }
+  },
+  "bin": "bin/autoinstall"
 }

test/koa.js

@@ -0,0 +1,3 @@
+
+require('koa')
+console.log('koa passed!')

test/test.js

@@ -16,3 +16,5 @@ assert(require('debug'))
 assert(require('mocha'))
 assert(require('should'))
 assert('function', typeof require('type-is'))
+
+console.log('tests pass!!!')