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website/node_modules/npm/lib/utils/escape-exec-path.js

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+'use strict'
+var path = require('path')
+var isWindowsShell = require('./is-windows-shell.js')
+
+/*
+Escape the name of an executable suitable for passing to the system shell.
+
+Windows is easy, wrap in double quotes and you're done, as there's no
+facility to create files with quotes in their names.
+
+Unix-likes are a little more complicated, wrap in single quotes and escape
+any single quotes in the filename.
+*/
+
+module.exports = escapify
+
+function windowsQuotes (str) {
+  if (!/ /.test(str)) return str
+  return '"' + str + '"'
+}
+
+function escapify (str) {
+  if (isWindowsShell) {
+    return path.normalize(str).split(/\\/).map(windowsQuotes).join('\\')
+  } else if (/[^-_.~/\w]/.test(str)) {
+    return "'" + str.replace(/'/g, "'\"'\"'") + "'"
+  } else {
+    return str
+  }
+}