[fix] windows support

Fixes timoxley#19

.gitignore

@@ -1 +1,2 @@
 node_modules
+!/test/**/node_modules

index.js

@@ -4,8 +4,8 @@ var npmPath = require('npm-path')
 var childProcess = require('child_process')
 
 var exec = childProcess.exec
-var spawn = childProcess.spawn
-var spawnSync = childProcess.spawnSync
+var spawn = require('cross-spawn')
+var spawnSync = spawn.sync
 
 // polyfill for childProcess.execSync
 var execSync = childProcess.execSync

package.json

@@ -18,6 +18,7 @@
     "tape": "^4.9.0"
   },
   "dependencies": {
+    "cross-spawn": "^6.0.5",
     "minimist": "^1.2.0",
     "npm-path": "^2.0.4",
     "npm-which": "^3.0.1",

test/bin.js

@@ -5,7 +5,7 @@ var bl = require('bl')
 var fs = require('fs')
 
 var path = require('path')
-var spawn = require('child_process').spawn
+var spawn = require('cross-spawn')
 
 var level0 = path.join(__dirname, 'fixtures', 'level0')
 var level1 = path.join(level0, 'node_modules', 'level1')

test/exec.js

@@ -35,7 +35,7 @@ test('options are optional', function (t) {
 
   npmRun(badPath, function (err, stdout, stderr) {
     t.ok(err, 'has error')
-    t.equal(err.code, 127)
+    t.equal(err.code, (process.platform === 'win32' ? 1 : 127))
     t.end()
   })
 })