fixed windows file URIs with leading slashes (#17)

npa.js

@@ -162,7 +162,13 @@ function parseUrl (res, arg, urlparse) {
 
     case "file:":
       res.type = "local"
-      res.spec = urlparse.pathname
+      if (isWindows && arg.match(/^file:\/\/\/?[a-z]:/i)) {
+        // Windows URIs usually parse all wrong, so we just take matters
+        // into our own hands, in this case.
+        res.spec = arg.replace(/^file:\/\/\/?/i, '')
+      } else {
+        res.spec = urlparse.pathname
+      }
       break
 
     default:

test/windows.js

@@ -21,6 +21,38 @@ var cases = {
     spec: path.resolve("C:\\x\\y\\z"),
     type: "local"
   },
+  "foo@file:///C:\\x\\y\\z": {
+    raw: "foo@file:///C:\\x\\y\\z",
+    scope: null,
+    name: "foo",
+    rawSpec: "file:///C:\\x\\y\\z",
+    spec: path.resolve("C:\\x\\y\\z"),
+    type: "local"
+  },
+  "foo@file://C:\\x\\y\\z": {
+    raw: "foo@file://C:\\x\\y\\z",
+    scope: null,
+    name: "foo",
+    rawSpec: "file://C:\\x\\y\\z",
+    spec: path.resolve("C:\\x\\y\\z"),
+    type: "local"
+  },
+  "file:///C:\\x\\y\\z": {
+    raw: "file:///C:\\x\\y\\z",
+    scope: null,
+    name: null,
+    rawSpec: "file:///C:\\x\\y\\z",
+    spec: path.resolve("C:\\x\\y\\z"),
+    type: "local"
+  },
+  "file://C:\\x\\y\\z": {
+    raw: "file://C:\\x\\y\\z",
+    scope: null,
+    name: null,
+    rawSpec: "file://C:\\x\\y\\z",
+    spec: path.resolve("C:\\x\\y\\z"),
+    type: "local"
+  },
   "foo@/foo/bar/baz": {
     raw: "foo@/foo/bar/baz",
     scope: null,