feat: add nextTo method, close #5

README.md

@@ -27,9 +27,6 @@ chdir.to('foo/bar/folder')
     // resolved with value 'foo'
 ```
 
-Implemented using [q][q], [spots][spots], [lazy-ass][lazy-ass] and
-[check-more-types][check-more-types].
-
 **Advice**
 
 Put `chdir.back` into `.finally` callback to make sure it is always executed, even if there is an exception.
@@ -43,8 +40,28 @@ chdir.to('foo/bar/folder')
     .finally(chdir.back); // called
 ```
 
-[q]: https://www.npmjs.com/package/q
-[spots]: https://www.npmjs.com/package/spots
+### nextTo
+
+If you have several hops you can schedule next hop using `chdir.nextTo` which allows
+you to save extra empty function.
+
+```js
+// second hop is deferred
+chdir.to('first/folder')
+    .then(chdir.back)
+    .to(() => chdir.to('second/folder'))
+```
+
+```js
+// equivalent
+chdir.to('first/folder')
+    .then(chdir.back)
+    .to(chdir.nextTo('second/folder'))
+```
+
+Implemented using [bluebird][https://github.com/petkaantonov/bluebird], 
+[lazy-ass][lazy-ass] and [check-more-types][check-more-types].
+
 [lazy-ass]: https://www.npmjs.com/package/lazy-ass
 [check-more-types]: https://www.npmjs.com/package/check-more-types
 

index.js

@@ -38,8 +38,11 @@ const chdirTo = folderName => {
   return Promise.try(() => _to(folderName))
 }
 
+const nextTo = folderName => () => chdirTo(folderName)
+
 module.exports = {
   to: chdirTo,
   back: comeBack,
-  from: comeBack
+  from: comeBack,
+  nextTo: nextTo
 }

package.json

@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "test": "echo running unit tests",
-    "posttest": "mocha test/*-spec.js",
+    "posttest": "npm run unit",
+    "unit": "mocha test/*-spec.js",
     "demo": "DEBUG=chdir-promise node test/demo.js",
     "deps": "deps-ok && dependency-check --no-dev .",
     "semantic-release": "semantic-release",

test/chdir-promise-spec.js

@@ -67,4 +67,31 @@ describe('chdir-promise', () => {
         })
     })
   })
+
+  context('nextTo', () => {
+    it('is a function', () => {
+      la(is.fn(chdir.nextTo))
+    })
+
+    it('helps hop twice', () =>
+      chdir
+        .to(__dirname)
+        .then(here)
+        .then(chdir.back)
+        .then(inOriginal)
+        .then(chdir.nextTo(__dirname))
+        .then(here)
+        .then(chdir.back)
+        .then(inOriginal))
+
+    it('helps hop twice and twice back', () =>
+      chdir
+        .to(__dirname)
+        .then(chdir.nextTo(originalFolder))
+        .then(inOriginal)
+        .then(chdir.back)
+        .then(here)
+        .then(chdir.back)
+        .then(inOriginal))
+  })
 })