Add extracted source directory and README navigation

extracted-source/node_modules/isexe/index.js

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+var fs = require('fs')
+var core
+if (process.platform === 'win32' || global.TESTING_WINDOWS) {
+  core = require('./windows.js')
+} else {
+  core = require('./mode.js')
+}
+
+module.exports = isexe
+isexe.sync = sync
+
+function isexe (path, options, cb) {
+  if (typeof options === 'function') {
+    cb = options
+    options = {}
+  }
+
+  if (!cb) {
+    if (typeof Promise !== 'function') {
+      throw new TypeError('callback not provided')
+    }
+
+    return new Promise(function (resolve, reject) {
+      isexe(path, options || {}, function (er, is) {
+        if (er) {
+          reject(er)
+        } else {
+          resolve(is)
+        }
+      })
+    })
+  }
+
+  core(path, options || {}, function (er, is) {
+    // ignore EACCES because that just means we aren't allowed to run it
+    if (er) {
+      if (er.code === 'EACCES' || options && options.ignoreErrors) {
+        er = null
+        is = false
+      }
+    }
+    cb(er, is)
+  })
+}
+
+function sync (path, options) {
+  // my kingdom for a filtered catch
+  try {
+    return core.sync(path, options || {})
+  } catch (er) {
+    if (options && options.ignoreErrors || er.code === 'EACCES') {
+      return false
+    } else {
+      throw er
+    }
+  }
+}

extracted-source/node_modules/isexe/mode.js

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+module.exports = isexe
+isexe.sync = sync
+
+var fs = require('fs')
+
+function isexe (path, options, cb) {
+  fs.stat(path, function (er, stat) {
+    cb(er, er ? false : checkStat(stat, options))
+  })
+}
+
+function sync (path, options) {
+  return checkStat(fs.statSync(path), options)
+}
+
+function checkStat (stat, options) {
+  return stat.isFile() && checkMode(stat, options)
+}
+
+function checkMode (stat, options) {
+  var mod = stat.mode
+  var uid = stat.uid
+  var gid = stat.gid
+
+  var myUid = options.uid !== undefined ?
+    options.uid : process.getuid && process.getuid()
+  var myGid = options.gid !== undefined ?
+    options.gid : process.getgid && process.getgid()
+
+  var u = parseInt('100', 8)
+  var g = parseInt('010', 8)
+  var o = parseInt('001', 8)
+  var ug = u | g
+
+  var ret = (mod & o) ||
+    (mod & g) && gid === myGid ||
+    (mod & u) && uid === myUid ||
+    (mod & ug) && myUid === 0
+
+  return ret
+}

extracted-source/node_modules/isexe/windows.js

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+module.exports = isexe
+isexe.sync = sync
+
+var fs = require('fs')
+
+function checkPathExt (path, options) {
+  var pathext = options.pathExt !== undefined ?
+    options.pathExt : process.env.PATHEXT
+
+  if (!pathext) {
+    return true
+  }
+
+  pathext = pathext.split(';')
+  if (pathext.indexOf('') !== -1) {
+    return true
+  }
+  for (var i = 0; i < pathext.length; i++) {
+    var p = pathext[i].toLowerCase()
+    if (p && path.substr(-p.length).toLowerCase() === p) {
+      return true
+    }
+  }
+  return false
+}
+
+function checkStat (stat, path, options) {
+  if (!stat.isSymbolicLink() && !stat.isFile()) {
+    return false
+  }
+  return checkPathExt(path, options)
+}
+
+function isexe (path, options, cb) {
+  fs.stat(path, function (er, stat) {
+    cb(er, er ? false : checkStat(stat, path, options))
+  })
+}
+
+function sync (path, options) {
+  return checkStat(fs.statSync(path), path, options)
+}