added 'strict' option (#28)

README.md

@@ -60,3 +60,10 @@ Default: `false`
 Required: `false`
 
 Use Base64 encoding for svgs.
+
+####strict
+Type: `bool`
+Default: `false`
+Required: `false`
+
+Fail on error

index.js

@@ -15,7 +15,8 @@ module.exports = postcss.plugin('postcss-image-inliner', function (opts) {
     opts = defaults(opts || {}, {
         assetPaths:  [],
         maxFileSize: 10240,
-        b64Svg:      false
+        b64Svg:      false,
+        strict:      false
     });
 
     if (isString(opts.assetPaths)) {
@@ -85,10 +86,16 @@ module.exports = postcss.plugin('postcss-image-inliner', function (opts) {
                         debug(url, 'successfully replaced with ', data[url]);
                     } else {
                         debug(url, 'failed');
+                        if (opts.strict) {
+                            throw new Error('No file found for ' + url);
+                        }
                     }
                 }));
             }).catch(function (err) {
                 debug(err);
+                return new Promise(function (resolve, reject) {
+                    reject(err);
+                });
             });
     };
 });

test/fixtures/styles/missing.in.css

@@ -0,0 +1,3 @@
+.shorthand {
+    background: transparent url("../images/missing.gif") no-repeat left top scroll;
+}

test/fixtures/styles/missing.out.css

@@ -0,0 +1,3 @@
+.shorthand {
+    background: transparent url("../images/missing.gif") no-repeat left top scroll;
+}

test/test.js

@@ -27,7 +27,6 @@ var test = function (input, output, opts, done) {
         expect(result.warnings()).to.be.empty;
         done();
     }).catch(function (error) {
-        console.log(error);
         done(error);
     });
 };
@@ -75,4 +74,18 @@ describe('postcss-image-inliner', function () {
     it('should consider base64Svg option', function (done) {
         test('b64svg.in.css', 'b64svg.out.css', { b64Svg: true, maxFileSize: 0 }, done);
     });
+
+    it('should do nothing on missing files in non strict mode', function (done) {
+        test('missing.in.css', 'missing.out.css', { }, done);
+    });
+
+    it('should fail on missing files in strict mode', function (done) {
+        test('missing.in.css', 'missing.out.css', { strict: true }, function (error) {
+            if (error) {
+                done();
+            } else {
+                done(new Error('Should fail'));
+            }
+        });
+    });
 });