From e73696a1e234032282fd58c73a4552a9b024879c Mon Sep 17 00:00:00 2001
From: Stas Vilchik <vilchiks@gmail.com>
Date: Wed, 21 Dec 2016 22:44:25 +0100
Subject: [PATCH] (#686): Add autofixer for newline-after-import

---
 src/rules/newline-after-import.js       |  9 ++++++++-
 tests/src/rules/newline-after-import.js | 13 +++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/rules/newline-after-import.js b/src/rules/newline-after-import.js
index 3198a9579..69bda294f 100644
--- a/src/rules/newline-after-import.js
+++ b/src/rules/newline-after-import.js
@@ -45,6 +45,7 @@ function isClassWithDecorator(node) {
 module.exports = {
   meta: {
     docs: {},
+    fixable: 'whitespace',
   },
   create: function (context) {
     let level = 0
@@ -55,7 +56,8 @@ module.exports = {
         nextNode = nextNode.decorators[0]
       }
 
-      if (getLineDifference(node, nextNode) < 2) {
+      const lineDiff = getLineDifference(node, nextNode)
+      if (lineDiff < 2) {
         let column = node.loc.start.column
 
         if (node.loc.start.line !== node.loc.end.line) {
@@ -68,6 +70,11 @@ module.exports = {
             column,
           },
           message: `Expected empty line after ${type} statement not followed by another ${type}.`,
+          fix(fixer) {
+            // add 1 blank line,
+            // or 2, if the nodes are on the same line
+            return fixer.insertTextAfter(node, lineDiff === 1 ? '\n' : '\n\n')
+          },
         })
       }
     }
diff --git a/tests/src/rules/newline-after-import.js b/tests/src/rules/newline-after-import.js
index afd942ef0..bda2742d8 100644
--- a/tests/src/rules/newline-after-import.js
+++ b/tests/src/rules/newline-after-import.js
@@ -146,6 +146,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
   invalid: [
     {
       code: "import foo from 'foo';\nexport default function() {};",
+      output: "import foo from 'foo';\n\nexport default function() {};",
       errors: [ {
         line: 1,
         column: 1,
@@ -155,6 +156,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var foo = require('foo-module');\nvar something = 123;",
+      output: "var foo = require('foo-module');\n\nvar something = 123;",
       errors: [ {
         line: 1,
         column: 1,
@@ -164,6 +166,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "import foo from 'foo';\nvar a = 123;\n\nimport { bar } from './bar-lib';\nvar b=456;",
+      output: "import foo from 'foo';\n\nvar a = 123;\n\nimport { bar } from './bar-lib';\n\nvar b=456;",
       errors: [
       {
         line: 1,
@@ -179,6 +182,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var foo = require('foo-module');\nvar a = 123;\n\nvar bar = require('bar-lib');\nvar b=456;",
+      output: "var foo = require('foo-module');\n\nvar a = 123;\n\nvar bar = require('bar-lib');\n\nvar b=456;",
       errors: [
         {
           line: 1,
@@ -194,6 +198,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var foo = require('foo-module');\nvar a = 123;\n\nrequire('bar-lib');\nvar b=456;",
+      output: "var foo = require('foo-module');\n\nvar a = 123;\n\nrequire('bar-lib');\n\nvar b=456;",
       errors: [
         {
           line: 1,
@@ -209,6 +214,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var path = require('path');\nvar foo = require('foo');\nvar bar = 42;",
+      output: "var path = require('path');\nvar foo = require('foo');\n\nvar bar = 42;",
       errors: [ {
         line: 2,
         column: 1,
@@ -217,6 +223,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var assign = Object.assign || require('object-assign');\nvar foo = require('foo');\nvar bar = 42;",
+      output: "var assign = Object.assign || require('object-assign');\nvar foo = require('foo');\n\nvar bar = 42;",
       errors: [ {
         line: 2,
         column: 1,
@@ -225,6 +232,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "require('a');\nfoo(require('b'), require('c'), require('d'));\nrequire('d');\nvar foo = 'bar';",
+      output: "require('a');\nfoo(require('b'), require('c'), require('d'));\nrequire('d');\n\nvar foo = 'bar';",
       errors: [
         {
           line: 3,
@@ -235,6 +243,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "require('a');\nfoo(\nrequire('b'),\nrequire('c'),\nrequire('d')\n);\nvar foo = 'bar';",
+      output: "require('a');\nfoo(\nrequire('b'),\nrequire('c'),\nrequire('d')\n);\n\nvar foo = 'bar';",
       errors: [
         {
           line: 6,
@@ -245,6 +254,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "import path from 'path';\nimport foo from 'foo';\nvar bar = 42;",
+      output: "import path from 'path';\nimport foo from 'foo';\n\nvar bar = 42;",
       errors: [ {
         line: 2,
         column: 1,
@@ -254,6 +264,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "import path from 'path';import foo from 'foo';var bar = 42;",
+      output: "import path from 'path';import foo from 'foo';\n\nvar bar = 42;",
       errors: [ {
         line: 1,
         column: 25,
@@ -263,6 +274,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "import foo from 'foo';\n@SomeDecorator(foo)\nclass Foo {}",
+      output: "import foo from 'foo';\n\n@SomeDecorator(foo)\nclass Foo {}",
       errors: [ {
         line: 1,
         column: 1,
@@ -273,6 +285,7 @@ ruleTester.run('newline-after-import', require('rules/newline-after-import'), {
     },
     {
       code: "var foo = require('foo');\n@SomeDecorator(foo)\nclass Foo {}",
+      output: "var foo = require('foo');\n\n@SomeDecorator(foo)\nclass Foo {}",
       errors: [ {
         line: 1,
         column: 1,