feat: support config file using process.cwd() as directory

src/index.js

@@ -38,9 +38,18 @@ module.exports = (options) => {
 
   if (newOptions && hasSourceMap(newOptions)) {
     sourcemap = isSourceMapEnabled(newOptions);
-    newOptions = omitSourceMap(newOptions);
   }
 
+  // Try to resolve config file it it exists
+  const cwd = newOptions && hasCwd(newOptions) ? newOptions.cwd : process.cwd();
+  const configOptions = prettier.resolveConfig.sync(cwd);
+  if (configOptions != null) {
+    newOptions = Object.assign(configOptions, newOptions || {});
+  }
+
+  newOptions = omitSourceMap(newOptions);
+  newOptions = omitCwd(newOptions);
+
   // Do not send an empty option object.
   if (isEmpty(newOptions)) {
     newOptions = undefined;
@@ -130,6 +139,28 @@ const SOURCE_MAPS_OPTS = [
   'sourceMap', // Name of the property with rollup < 0.48.
 ];
 
+/**
+ * Check if given option object has a `cwd` entry.
+ *
+ * @param {Object} opts Option object.
+ * @return {boolean} `true` if `opts` has `cwd` entry, `false` otherwise.
+ */
+function hasCwd(opts) {
+  return 'cwd' in opts;
+}
+
+/**
+ * Create option object from given one removing `cwd` key if present.
+ *
+ * @param {Object} opts Option object.
+ * @return {Object} New option object.
+ */
+function omitCwd(opts) {
+  return omitBy(opts, (v, k) => (
+    k === 'cwd'
+  ));
+}
+
 /**
  * Check if `sourcemap` option is defined on option object.
  *

test/fixtures/prettier.config.js

@@ -0,0 +1,29 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Mickael Jeanroy
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+module.exports = {
+  parser: 'babylon',
+  singleQuote: true,
+  tabWidth: 2,
+};

test/index.spec.js

@@ -24,6 +24,7 @@
 
 'use strict';
 
+const path = require('path');
 const prettier = require('prettier');
 const plugin = require('../dist/index.js');
 
@@ -316,4 +317,22 @@ describe('rollup-plugin-prettier', () => {
       singleQuote: true,
     });
   });
+
+  it('should run prettier using config file from given current working directory', () => {
+    const cwd = path.join(__dirname, 'fixtures');
+    const options = {cwd};
+
+    spyOn(prettier, 'format').and.callThrough();
+
+    const code = 'var foo = 0;';
+    const instance = plugin(options);
+    instance.transformBundle(code);
+
+    expect(options).toEqual({cwd});
+    expect(prettier.format).toHaveBeenCalledWith(code, {
+      parser: 'babylon',
+      singleQuote: true,
+      tabWidth: 2,
+    });
+  });
 });

test/it/it.spec.js

@@ -52,7 +52,7 @@ describe('rollup-plugin-prettier', () => {
   it('should run prettier on final bundle', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
       output: {
         file: output,
         format: 'es',
@@ -90,7 +90,7 @@ describe('rollup-plugin-prettier', () => {
   it('should run prettier with @babel/parser instead of babylon', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
       output: {
         file: output,
         format: 'es',
@@ -132,7 +132,7 @@ describe('rollup-plugin-prettier', () => {
   it('should run prettier on final bundle with sourcemap set in output option', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
 
       output: {
         file: output,
@@ -172,7 +172,7 @@ describe('rollup-plugin-prettier', () => {
   it('should run prettier on final bundle with sourcemap set in output array option', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
 
       output: [
         {file: output, format: 'es', sourcemap: 'inline'},
@@ -212,7 +212,7 @@ describe('rollup-plugin-prettier', () => {
   it('should enable sourcemap (lowercase) on plugin', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
 
       output: {
         file: output,
@@ -250,7 +250,7 @@ describe('rollup-plugin-prettier', () => {
   it('should enable sourcemap (camelcase) on plugin', (done) => {
     const output = path.join(tmpDir.name, 'bundle.js');
     const config = {
-      input: path.join(__dirname, 'fixtures', 'bundle.js'),
+      input: getBundlePath(),
 
       output: {
         file: output,
@@ -284,4 +284,13 @@ describe('rollup-plugin-prettier', () => {
           done.fail(err);
         });
   });
+
+  /**
+   * Get the output bundle absolute path.
+   *
+   * @return {string} Bundle absolute path.
+   */
+  function getBundlePath() {
+    return path.join(__dirname, '..', 'fixtures', 'bundle.js');
+  }
 });