Add option to exclude files based on regular expression (xzyfer#86)

* Add support for import globbing

* Add test for import globbing

* Update readme for import globbing option

* Forgot semis

* Fix spread on old node versions

* Add option to exclude files matching regex

* Remove changes made in other pr

I should probably have made a new branch for that...

* Cache RegExp check

* Check ancestors descendants

* I should run tests before pushing...

* Add tests

* Remove package-lock.json

* Fix typo in readme

.gitignore

@@ -3,3 +3,6 @@ output
 .sass-cache
 test.js
 .nyc_output
+*.swp
+package-lock.json
+

readme.md

@@ -82,6 +82,13 @@ Default: `false`
 
 Follow symbolic links.
 
+#### exclude
+
+Type: `RegExp`
+Default: `undefined`
+
+Exclude files matching regular expression.
+
 ## Example
 
 ```js

sass-graph.js

@@ -42,6 +42,7 @@ function resolveSassPath(sassPath, loadPaths, extensions) {
 function Graph(options, dir) {
   this.dir = dir;
   this.extensions = options.extensions || [];
+  this.exclude = options.exclude instanceof RegExp ? options.exclude : null;
   this.index = {};
   this.follow = options.follow || false;
   this.loadPaths = _(options.loadPaths).map(function(p) {
@@ -58,6 +59,8 @@ function Graph(options, dir) {
 
 // add a sass file to the graph
 Graph.prototype.addFile = function(filepath, parent) {
+  if (this.exclude !== null && this.exclude.test(filepath)) return;
+
   var entry = this.index[filepath] = this.index[filepath] || {
     imports: [],
     importedBy: [],
@@ -75,6 +78,9 @@ Graph.prototype.addFile = function(filepath, parent) {
     resolved = resolveSassPath(imports[i], loadPaths, this.extensions);
     if (!resolved) continue;
 
+    // check exclcude regex
+    if (this.exclude !== null && this.exclude.test(resolved)) continue;
+
     // recurse into dependencies if not already enumerated
     if (!_.includes(entry.imports, resolved)) {
       entry.imports.push(resolved);
@@ -92,7 +98,10 @@ Graph.prototype.addFile = function(filepath, parent) {
       resolvedParent = parent;
     }
 
-    entry.importedBy.push(resolvedParent);
+    // check exclcude regex
+    if (!(this.exclude !== null && this.exclude.test(resolvedParent))) {
+      entry.importedBy.push(resolvedParent);
+    }
   }
 };
 

test/fixtures/exclusion-pattern/also-exclude-me.scss

@@ -0,0 +1 @@
+

test/fixtures/exclusion-pattern/dont-exclude.scss

@@ -0,0 +1,2 @@
+@import 'also-exclude-me';
+

test/fixtures/exclusion-pattern/index.scss

@@ -0,0 +1,3 @@
+@import "dont-exclude";
+@import "exclude-me";
+

test/parse-file.js

@@ -160,5 +160,15 @@ describe('sass-graph', function(){
         });
       });
     });
+
+    describe('with exclusion pattern', function() {
+      it('should exclude all files matching the regular expression', function() {
+        graph({ exclude: /exclude-/ })
+          .fromFixtureFile('exclusion-pattern')
+          .assertDecendents([
+            'dont-exclude.scss',
+          ]);
+      });
+    });
   });
 });