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website/node_modules/npm/lib/utils/escape-arg.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 escapify (str) {
+  if (isWindowsShell) {
+    return '"' + path.normalize(str) + '"'
+  } else {
+    if (/[^-_.~/\w]/.test(str)) {
+      return "'" + str.replace(/'/g, "'\"'\"'") + "'"
+    } else {
+      return str
+    }
+  }
+}