update

package/node_modules/read-cmd-shim/lib/index.js

@@ -0,0 +1,75 @@
+const fs = require('fs')
+const { promisify } = require('util')
+const { readFileSync } = fs
+const readFile = promisify(fs.readFile)
+
+const extractPath = (path, cmdshimContents) => {
+  if (/[.]cmd$/.test(path)) {
+    return extractPathFromCmd(cmdshimContents)
+  } else if (/[.]ps1$/.test(path)) {
+    return extractPathFromPowershell(cmdshimContents)
+  } else {
+    return extractPathFromCygwin(cmdshimContents)
+  }
+}
+
+const extractPathFromPowershell = cmdshimContents => {
+  const matches = cmdshimContents.match(/"[$]basedir[/]([^"]+?)"\s+[$]args/)
+  return matches && matches[1]
+}
+
+const extractPathFromCmd = cmdshimContents => {
+  const matches = cmdshimContents.match(/"%(?:~dp0|dp0%)\\([^"]+?)"\s+%[*]/)
+  return matches && matches[1]
+}
+
+const extractPathFromCygwin = cmdshimContents => {
+  const matches = cmdshimContents.match(/"[$]basedir[/]([^"]+?)"\s+"[$]@"/)
+  return matches && matches[1]
+}
+
+const wrapError = (thrown, newError) => {
+  newError.message = thrown.message
+  newError.code = thrown.code
+  newError.path = thrown.path
+  return newError
+}
+
+const notaShim = (path, er) => {
+  if (!er) {
+    er = new Error()
+    Error.captureStackTrace(er, notaShim)
+  }
+  er.code = 'ENOTASHIM'
+  er.message = `Can't read shim path from '${path}', ` +
+    `it doesn't appear to be a cmd-shim`
+  return er
+}
+
+const readCmdShim = path => {
+  // create a new error to capture the stack trace from this point,
+  // instead of getting some opaque stack into node's internals
+  const er = new Error()
+  Error.captureStackTrace(er, readCmdShim)
+  return readFile(path).then(contents => {
+    const destination = extractPath(path, contents.toString())
+    if (destination) {
+      return destination
+    }
+    throw notaShim(path, er)
+  }, readFileEr => {
+    throw wrapError(readFileEr, er)
+  })
+}
+
+const readCmdShimSync = path => {
+  const contents = readFileSync(path)
+  const destination = extractPath(path, contents.toString())
+  if (!destination) {
+    throw notaShim(path)
+  }
+  return destination
+}
+
+readCmdShim.sync = readCmdShimSync
+module.exports = readCmdShim