fix(tag): show source file in unformatted error message (#5031)

* fix(tag): show source file in error stack

* fix(tag): show source file in error message

lib/extend/tag.js

@@ -160,13 +160,15 @@ const getContext = (lines, errLine, location, type) => {
  * @return {Error}    New error object with embedded context
  */
 const formatNunjucksError = (err, input, source = '') => {
+  err.message = err.message.replace('(unknown path)', source ? magenta(source) : '');
+
   const match = err.message.match(/Line (\d+), Column \d+/);
   if (!match) return err;
   const errLine = parseInt(match[1], 10);
   if (isNaN(errLine)) return err;
 
   // trim useless info from Nunjucks Error
-  const splited = err.message.replace('(unknown path)', source ? magenta(source) : '').split('\n');
+  const splited = err.message.split('\n');
 
   const e = new Error();
   e.name = 'Nunjucks Error';
@@ -243,7 +245,9 @@ class Tag {
         options,
         cb
       );
-    }).catch(err => Promise.reject(formatNunjucksError(err, str, source)))
+    }).catch(err => {
+      return Promise.reject(formatNunjucksError(err, str, source));
+    })
       .asCallback(callback);
   }
 }

test/scripts/extend/tag_errors.js

@@ -124,4 +124,26 @@ describe('Tag Errors', () => {
       err.message.should.contains(source);
     }
   });
+
+  it('source file path 2', async () => {
+    const source = '_posts/hello-world.md';
+    const tag = new Tag();
+
+    tag.register('test',
+      (args, content) => {},
+      { ends: true });
+
+    const body = [
+      '{% test %}',
+      '${#var}',
+      '{% endtest %}'
+    ].join('\n');
+
+    try {
+      await tag.render(body, { source });
+    } catch (err) {
+      err.should.have.property('message');
+      err.message.should.contains(source);
+    }
+  });
 });