Support includePaths in the JS API (#162)

Closes #7

CHANGELOG.md

@@ -8,8 +8,8 @@
 
 ### Node JS API
 
-* Add support for `data`, `lineFeed`, `indentWidth`, and `indentType` options to
-  `render()` and `renderSync()`.
+* Add support for `data`, `includePaths`, `indentedSyntax`, `lineFeed`,
+  `indentWidth`, and `indentType` options to `render()` and `renderSync()`.
 
 ### Dart API
 

lib/src/node.dart

@@ -79,12 +79,14 @@ RenderResult _doRender(RenderOptions options) {
     }
 
     output = renderString(options.data,
+        loadPaths: options.includePaths,
         indented: options.indentedSyntax ?? false,
         useSpaces: options.indentType != 'tab',
         indentWidth: _parseIndentWidth(options.indentWidth),
         lineFeed: _parseLineFeed(options.linefeed));
   } else if (options.file != null) {
     output = render(options.file,
+        loadPaths: options.includePaths,
         indented: options.indentedSyntax,
         useSpaces: options.indentType != 'tab',
         indentWidth: _parseIndentWidth(options.indentWidth),

lib/src/node/render_options.dart

@@ -9,6 +9,7 @@ import 'package:js/js.dart';
 class RenderOptions {
   external String get file;
   external String get data;
+  external List<String> get includePaths;
   external bool get indentedSyntax;
   external String get indentType;
   external dynamic get indentWidth;
@@ -17,6 +18,7 @@ class RenderOptions {
   external factory RenderOptions(
       {String file,
       String data,
+      List<String> includePaths,
       bool indentedSyntax,
       String indentType,
       indentWidth,

lib/src/render.dart

@@ -15,6 +15,7 @@ String render(String path,
         {bool indented,
         bool color: false,
         SyncPackageResolver packageResolver,
+        Iterable<String> loadPaths,
         bool useSpaces: true,
         int indentWidth,
         LineFeed lineFeed}) =>
@@ -22,6 +23,7 @@ String render(String path,
         indented: indented ?? p.extension(path) == '.sass',
         color: color,
         packageResolver: packageResolver,
+        loadPaths: loadPaths,
         useSpaces: useSpaces,
         indentWidth: indentWidth,
         lineFeed: lineFeed,
@@ -33,6 +35,7 @@ String renderString(String source,
     {bool indented: false,
     bool color: false,
     SyncPackageResolver packageResolver,
+    Iterable<String> loadPaths,
     bool useSpaces: true,
     int indentWidth,
     LineFeed lineFeed,
@@ -40,8 +43,8 @@ String renderString(String source,
   var sassTree = indented
       ? new Stylesheet.parseSass(source, url: url, color: color)
       : new Stylesheet.parseScss(source, url: url, color: color);
-  var cssTree =
-      evaluate(sassTree, color: color, packageResolver: packageResolver);
+  var cssTree = evaluate(sassTree,
+      color: color, packageResolver: packageResolver, loadPaths: loadPaths);
   return toCss(cssTree,
       useSpaces: useSpaces, indentWidth: indentWidth, lineFeed: lineFeed);
 }

lib/src/visitor/perform.dart

@@ -620,9 +620,12 @@ class _PerformVisitor
           ? _tryImportPath
           : _tryImportPathWithExtensions;
 
-      var base = p.dirname(p.fromUri(import.span.file.url));
-      var resolved = tryPath(p.join(base, path));
-      if (resolved != null) return resolved;
+      if (import.span.file.url != null) {
+        var base = p.dirname(p.fromUri(import.span.file.url));
+
+        var resolved = tryPath(p.join(base, path));
+        if (resolved != null) return resolved;
+      }
 
       for (var loadPath in _loadPaths) {
         var resolved = tryPath(p.join(loadPath, path));

test/hybrid.dart

@@ -15,6 +15,10 @@ Future<String> createTempDir() async => (await runHybridExpression(
 Future writeTextFile(String path, String text) => runHybridExpression(
     'new File(message[0]).writeAsString(message[1])', [path, text]);
 
+/// Creates a directoy at [path].
+Future createDirectory(String path) =>
+    runHybridExpression('new Directory(message).create()', path);
+
 /// Recursively deletes the directoy at [path].
 Future deleteDirectory(String path) =>
     runHybridExpression('new Directory(message).delete(recursive: true)', path);

test/node_api_test.dart

@@ -79,6 +79,33 @@ a {
           contains('Either options.data or options.file must be set.'));
     });
 
+    test("supports load paths", () {
+      expect(
+          _renderSync(new RenderOptions(
+              data: "@import 'test'", includePaths: [sandbox])),
+          equals('''
+a {
+  b: c;
+}'''));
+    });
+
+    test("supports relative paths in preference to load paths", () async {
+      await createDirectory(p.join(sandbox, 'sub'));
+      var subPath = p.join(sandbox, 'sub/test.scss');
+      await writeTextFile(subPath, 'x {y: z}');
+
+      var importerPath = p.join(sandbox, 'importer.scss');
+      await writeTextFile(importerPath, '@import "test"');
+
+      expect(
+          _renderSync(new RenderOptions(
+              file: importerPath, includePaths: [p.join(sandbox, 'sub')])),
+          equals('''
+a {
+  b: c;
+}'''));
+    });
+
     test("can render the indented syntax", () {
       expect(
           _renderSync(