From 42ed00bb8fb659dc6868e21f65734ecf12aa57e7 Mon Sep 17 00:00:00 2001
From: James Talmage <james@talmage.io>
Date: Sun, 12 Jun 2016 03:10:29 -0400
Subject: [PATCH 1/2] allow member function access

---
 index.js             |  4 ++++
 optimization-test.js |  2 +-
 test.js              | 16 ++++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 58c28b3..dfb3513 100644
--- a/index.js
+++ b/index.js
@@ -37,6 +37,10 @@ var pify = module.exports = function (obj, P, opts) {
 		P = Promise;
 	}
 
+	if (typeof opts === 'string') {
+		return processFn(obj[opts], P, {}).bind(obj);
+	}
+
 	opts = opts || {};
 	var exclude = opts.exclude || [/.+Sync$/];
 
diff --git a/optimization-test.js b/optimization-test.js
index c883b7a..020993d 100644
--- a/optimization-test.js
+++ b/optimization-test.js
@@ -1,4 +1,4 @@
-/* eslint-disable no-fallthrough */
+/* eslint-disable no-fallthrough, xo/no-process-exit*/
 'use strict';
 var assert = require('assert');
 var Promise = require('pinkie-promise');
diff --git a/test.js b/test.js
index 6b67139..38e206b 100644
--- a/test.js
+++ b/test.js
@@ -27,6 +27,16 @@ const fixtureModule = {
 	method3: fixture5
 };
 
+class Concat {
+	constructor(a) {
+		this.a = a;
+	}
+
+	b(b, cb) {
+		setImmediate(() => cb(null, this.a + b));
+	}
+}
+
 test('main', async t => {
 	t.is(typeof fn(fixture)().then, 'function');
 	t.is(await fn(fixture)(), 'unicorn');
@@ -44,6 +54,12 @@ test('multiArgs option', async t => {
 	t.deepEqual(await fn(fixture3, {multiArgs: true})(), ['unicorn', 'rainbow']);
 });
 
+test('string option returns promisified thunk for member function', async t => {
+	const concat = new Concat('foo');
+
+	t.is(await fn(concat, 'b')('bar'), 'foobar');
+});
+
 test('wrap core method', async t => {
 	t.is(JSON.parse(await fn(fs.readFile)('package.json')).name, 'pify');
 });

From 2a58e44e2abfa00b5c2e3d2874d769e013afe0a6 Mon Sep 17 00:00:00 2001
From: James Talmage <james@talmage.io>
Date: Sun, 12 Jun 2016 03:18:26 -0400
Subject: [PATCH 2/2] documentation

---
 readme.md | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/readme.md b/readme.md
index b0854b6..c83b7ed 100644
--- a/readme.md
+++ b/readme.md
@@ -34,7 +34,7 @@ pify(fs).readFile('package.json', 'utf8').then(data => {
 
 ## API
 
-### pify(input, [promiseModule], [options])
+### pify(input, [promiseModule], [methodName | options])
 
 Returns a promise wrapped version of the supplied function or module.
 
@@ -52,6 +52,24 @@ Custom promise module to use instead of the native one.
 
 Check out [`pinkie-promise`](https://github.com/floatdrop/pinkie-promise) if you need a tiny promise polyfill.
 
+#### methodName
+
+Type: `string`
+
+Specify a specific member function of `input` to promisify:
+
+```js
+var x = {
+  a: 'foo',
+  b: function (b, cb) {
+    cb(null, this.a + b);
+  }
+};
+
+pify(x, 'b')('bar')
+//=> Promise for "foobar"
+```
+
 #### options
 
 ##### multiArgs