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Re-Natal

Bootstrap ClojureScript-based React Native apps with Reagent and re-frame

Artur Girenko, MIT License @drapanjanas

This project is a fork of dmotz/natal by Dan Motzenbecker with the goal of generating skeleton of native app for iOS and Android based on Reagent and re-frame.

The support of Figwheel is based on brilliant solution developed by Will Decker decker405/figwheel-react-native which works in both platforms.

Re-Natal is a simple command-line utility that automates most of the process of setting up a React Native app running on ClojureScript with Reagent an re-frame.

Generated project works in iOS and Android devices.

For more ClojureScript React Native resources visit cljsrn.org.

Contributions are welcome.

State

  • Uses React Native v0.17.0
  • Same codebase for iOS and Android
  • Figwheel used for REPL and live coding.
    • Works in iOS (tested using simulator).
    • Works in real Android device
    • Works in Android simulator Genymotion (with re-natal use-figwheel -H 10.0.3.2)
    • Works in stock Android emulator (with re-natal use-figwheel -H 10.0.2.2)
    • Figwheel REPL can be started within nREPL
    • You can reload app any time, no problem.
    • "Debug in Chrome" is not required anymore.
  • Optimizations :simple is used to compile "production" index.ios.js and index.android.js
  • Unified way of using static images of rn 0.14+ works
  • Works on Linux (Android only)

Usage

Before getting started, make sure you have the required dependencies installed.fix in

Then, install the CLI using npm:

$ npm install -g re-natal

To bootstrap a new app, run re-natal init with your app's name as an argument:

$ re-natal init FutureApp

If your app's name is more than a single word, be sure to type it in CamelCase. A corresponding hyphenated Clojure namespace will be created.

Re-Natal will create a simple skeleton based on the current version of Reagent and Day8/re-frame. If all goes well you should see printed out basic instructions how to run in iOS simulator.

$ cd future-app

To run in iOS:

$ re-natal xcode

and then run your app from Xcode normally.

To run in Android, connect your device and:

$ adb reverse tcp:8081 tcp:8081
$ react-native run-android

Initially the ClojureScript is compiled in "prod" profile, meaning index.*.js files are compiled with optimizations :simple. Development in such mode is not fun because of slow compilation and long reload time.

Luckily, this can be improved by compiling with optimizations :none and using Figwheel.

Using Figwheel in iOS simulator

Start your app from Xcode as described above.

Then, to start development mode execute commands:

$ re-natal use-figwheel
$ lein figwheel ios

This will generate index.ios.js and index.android.js which works with compiler modeoptimizations :none.

Using Figwheel in real Android device

To run figwheel with real Android device please read Running on Device. To make it work on USB connected device I had also to do the following:

$ adb reverse tcp:8081 tcp:8081
$ adb reverse tcp:3449 tcp:3449

Then:

$ re-natal use-figwheel
$ lein figwheel android

And deploy your app:

$ react-native run-android

Using Figwheel in Genymotion simulator

With genymotion Android simulator you have to use IP "10.0.3.2" in urls to refer to your local machine. To specify this use:

$ re-natal use-figwheel -H 10.0.3.2
$ lein figwheel android

Start your simulator and deploy your app:

$ react-native run-android

Using Figwheel in stock Android emulator (AVD)

With stock Android emulator you have to use IP "10.0.2.2" in urls to refer to your local machine. To specify this use:

$ re-natal use-figwheel -H 10.0.2.2
$ lein figwheel android

Start your simulator and deploy your app:

$ react-native run-android

Starting Figwheel REPL from nREPL

To start Figwheel within nREPL session:

$ lein repl

Then in the nREPL prompt type:

user=> (figwheel-ios)

Or, for Android build type:

user=> (figwheel-android)

REPL

You have to reload your app, and should see the REPL coming up with the prompt.

At the REPL prompt, try loading your app's namespace:

(in-ns 'future-app.ios.core)

Changes you make via the REPL or by changing your .cljs files should appear live in the simulator.

Try this command as an example:

(dispatch [:set-greeting "Hello Native World!"])

Running on Linux

In addition to the instructions above on Linux you might need to start React Native packager manually with command react-native start. This was reported in #3

See also Linux and Windows support in React Native docs.

"Prod" build

Do this with command:

$ lein prod-build

It will clean and rebuild index.ios.js and index.android.js with optimizations :simple

Having index.ios.js and index.android.js build this way, you should be able to follow the RN docs to proceed with the release.

Upgrading existing Re-Natal project

Do this if you want to use newer version of re-natal.

Commit or backup your current project, so that you can restore it in case of any problem ;)

Upgrade re-natal npm package

$ npm upgrade -g re-natal

In root directory of your project run

$ re-natal upgrade

This will overwrite only some files which usually contain fixes in newer versions of re-natal, and are unlikely to be changed by the user. No checks are done, these files are just overwritten:

  • files in /env directory
  • figwheel-bridge.js

Then to continue development using figwheel

$ re-natal use-figwheel

To upgrade React Native to newer version please follow the official Upgrading guide of React Native. Re-Natal makes no changes to the files generated by react-native so the official guide should be valid.

Tips

  • Having rlwrap installed is optional but highly recommended since it makes the REPL a much nicer experience with arrow keys.

  • Running multiple React Native apps at once can cause problems with the React Packager so try to avoid doing so.

  • You can launch your app on the simulator without opening Xcode by running re-natal launch in your app's root directory.

  • By default new Natal projects will launch on the iPhone 6 simulator. To change which device re-natal launch uses, you can run re-natal listdevices to see a list of available simulators, then select one by running re-natal setdevice with the index of the device on the list.

  • To change advanced settings run re-natal xcode to quickly open the Xcode project.

  • The Xcode-free workflow is for convenience. If you're encountering app crashes, you should open the Xcode project and run it from there to view errors.

Dependencies

As Re-Natal is the orchestration of many individual tools, there are quite a few dependencies. If you've previously done React Native or Clojure development, you should hopefully have most installed already. Platform dependencies are listed under their respective tools.