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calculator

Development

Open a terminal and type lein repl to start a Clojure REPL (interactive prompt).

In the REPL, type

(run)
(browser-repl)

The call to (run) starts the Figwheel server at port 3449, which takes care of live reloading ClojureScript code and CSS. Figwheel's server will also act as your app server, so requests are correctly forwarded to the http-handler you define.

Running (browser-repl) starts the Figwheel ClojureScript REPL. Evaluating expressions here will only work once you've loaded the page, so the browser can connect to Figwheel.

When you see the line Successfully compiled "resources/public/app.js" in 21.36 seconds., you're ready to go. Browse to http://localhost:3449 and enjoy.

Attention: It is not needed to run lein figwheel separately. Instead we launch Figwheel directly from the REPL

Trying it out

If all is well you now have a browser window saying 'Hello Chestnut', and a REPL prompt that looks like cljs.user=>.

Open resources/public/css/style.css and change some styling of the H1 element. Notice how it's updated instantly in the browser.

Open src/cljs/calculator/core.cljs, and change dom/h1 to dom/h2. As soon as you save the file, your browser is updated.

In the REPL, type

(ns calculator.core)
(swap! app-state assoc :text "Interactivity FTW")

Notice again how the browser updates.

Lighttable

Lighttable provides a tighter integration for live coding with an inline browser-tab. Rather than evaluating cljs on the command line with the Figwheel REPL, you can evaluate code and preview pages inside Lighttable.

Steps: After running (run), open a browser tab in Lighttable. Open a cljs file from within a project, go to the end of an s-expression and hit Cmd-ENT. Lighttable will ask you which client to connect. Click 'Connect a client' and select 'Browser'. Browse to http://localhost:3449

View LT's console to see a Chrome js console.

Hereafter, you can save a file and see changes or evaluate cljs code (without saving a file).

Emacs/CIDER

CIDER is able to start both a Clojure and a ClojureScript REPL simultaneously, so you can interact both with the browser, and with the server. The command to do this is M-x cider-jack-in-clojurescript.

We need to tell CIDER how to start a browser-connected Figwheel REPL though, otherwise it will use a JavaScript engine provided by the JVM, and you won't be able to interact with your running app.

Put this in your Emacs configuration (~/.emacs.d/init.el or ~/.emacs)

(setq cider-cljs-lein-repl
      "(do (user/run)
           (user/browser-repl))")

Now M-x cider-jack-in-clojurescript (shortcut: C-c M-J, that's a capital "J", so Meta-Shift-j), point your browser at http://localhost:3449, and you're good to go.

Testing

To run the Clojure tests, use

lein test

To run the Clojurescript you use doo. This can run your tests against a variety of JavaScript implementations, but in the browser and "headless". For example, to test with PhantomJS, use

lein doo phantom

Deploying to Heroku

This assumes you have a Heroku account, have installed the Heroku toolbelt, and have done a heroku login before.

git init
git add -A
git commit
heroku create
git push heroku master:master
heroku open

Running with Foreman

Heroku uses Foreman to run your app, which uses the Procfile in your repository to figure out which server command to run. Heroku also compiles and runs your code with a Leiningen "production" profile, instead of "dev". To locally simulate what Heroku does you can do:

lein with-profile -dev,+production uberjar && foreman start

Now your app is running at http://localhost:5000 in production mode.

License

Copyright © 2016 FIXME

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.

Chestnut

Created with Chestnut 0.14.0 (66af6f40).