fix(windows): fixed windows binary pathing issues

Fixes: #62

index.js

@@ -126,9 +126,13 @@ function localBinPath (cwd) {
 module.exports._getEnv = getEnv
 function getEnv (opts) {
   const args = ['run', 'env', '--parseable']
-  return which(opts.npm).catch(() => {
-    args.unshift(opts.npm)
-    return process.argv[0]
+  return findNodeScript(opts.npm, {isLocal: true}).then(npmPath => {
+    if (npmPath) {
+      args.unshift(opts.npm)
+      return process.argv[0]
+    } else {
+      return opts.npm
+    }
   }).then(npmPath => {
     return child.exec(npmPath, args)
   }).then(require('dotenv').parse)
@@ -188,9 +192,13 @@ function getNpmCache (opts) {
   if (opts.userconfig) {
     args.push('--userconfig', child.escapeArg(opts.userconfig, true))
   }
-  return which(opts.npm).catch(() => {
-    args.unshift(opts.npm)
-    return process.argv[0]
+  return findNodeScript(opts.npm, {isLocal: true}).then(npmPath => {
+    if (npmPath) {
+      args.unshift(opts.npm)
+      return process.argv[0]
+    } else {
+      return opts.npm
+    }
   }).then(npmPath => {
     return child.exec(npmPath, args)
   }).then(cache => cache.trim())
@@ -210,9 +218,13 @@ function buildArgs (specs, prefix, opts) {
 module.exports._installPackages = installPackages
 function installPackages (specs, prefix, opts) {
   const args = buildArgs(specs, prefix, opts)
-  return which(opts.npm).catch(() => {
-    args.unshift(opts.npm)
-    return process.argv[0]
+  return findNodeScript(opts.npm, {isLocal: true}).then(npmPath => {
+    if (npmPath) {
+      args.unshift(opts.npm)
+      return process.argv[0]
+    } else {
+      return opts.npm
+    }
   }).then(npmPath => {
     return child.escapeArg(npmPath, true)
   }).then(npmPath => {

test/index.js

@@ -10,10 +10,7 @@ const test = require('tap').test
 const main = require('../index.js')
 
 const NPX_PATH = path.resolve(__dirname, 'util', 'npx-bin.js')
-let NPM_PATH = path.resolve(__dirname, '..', 'node_modules', '.bin', 'npm')
-if (process.platform === 'win32') {
-  NPM_PATH += '.CMD'
-}
+let NPM_PATH = path.resolve(__dirname, '..', 'node_modules', 'npm', 'bin', 'npm-cli.js')
 
 test('npx --shell-auto-fallback', t => {
   return child.spawn('node', [
@@ -53,7 +50,9 @@ test('npx existing subcommand', {
   })
 })
 
-test('execCommand unit', t => {
+test('execCommand unit', {
+  skip: process.platform === 'win32' && 'need a workaround for obnoxious auto-open of .md file on Windows'
+}, t => {
   let whichBin = path.resolve(
     __dirname, '..', 'node_modules', '.bin', 'which'
   )
@@ -89,9 +88,9 @@ test('installPackages unit', t => {
   const installPkgs = requireInject('../index.js', {
     '../child.js': {
       spawn (npmPath, args) {
-        if (args[1] === 'fail') {
+        if (args[2] === 'fail') {
           return Promise.reject(new Error('fail'))
-        } else if (args[1] === 'codefail') {
+        } else if (args[2] === 'codefail') {
           const err = new Error('npm failed')
           err.exitCode = 123
           return Promise.reject(err)
@@ -109,8 +108,8 @@ test('installPackages unit', t => {
   return installPkgs(['installme@latest', 'file:foo'], 'myprefix', {
     npm: NPM_PATH
   }).then(deets => {
-    t.equal(deets[0], NPM_PATH, 'spawn got the right path to npm')
     t.deepEqual(deets[1], [
+      NPM_PATH,
       'install', 'installme@latest', 'file:foo',
       '--global',
       '--prefix', 'myprefix',
@@ -161,12 +160,12 @@ test('getNpmCache', t => {
     }
   })._getNpmCache
   return getCache({npm: NPM_PATH}).then(cache => {
-    t.equal(cache, `${NPM_PATH} config get cache --parseable`, 'requests cache from npm')
+    t.equal(cache, `${process.argv[0]} ${NPM_PATH} config get cache --parseable`, 'requests cache from npm')
     return getCache({npm: NPM_PATH, userconfig})
   }).then(cache => {
     t.equal(
       cache,
-      `${NPM_PATH} config get cache --parseable --userconfig ${
+      `${process.argv[0]} ${NPM_PATH} config get cache --parseable --userconfig ${
         userconfig
       }-escaped-as-path-true`,
       'added userconfig if option present'