Programming Enchiladas
A ClojureScript-based HTML5 Canvas and SVG Graphics Playground, much like http://bl.ocks.org/ but specifically designed for showcasing small ClojuresScript code demos: The underlying agenda is to show how small simple functional programs can generate complex behaviour.
I was getting sick of setting up yet another lein/noir for every new folly, so it made more sense to have a framework which loads public ClojureScript gists directly from github, compiles them on the fly and serves them out.
This allows shared/social and version-tracked editable ClojureScripts to be run by anyone anywhere with a reasonably modern browser (tested in Chrome/FF/Safari). In order to compile and run any .cljs files in gist https://gist.github.com/rm-hull/5278162 (for example), go to http://programming-enchiladas.destructuring-bind.org/rm-hull/5278162 - see below for more examples.
As part of the available 'stack' (for want of a better word), the following client-side clojureScript bindings are available:
| Function | Notes |
|---|---|
| enchilada/canvas | A canvas object, which you can resize, move, whatever. |
| enchilada/ctx | The graphics context, on to which you draw your stuff. |
| enchilada/svg | An SVG object, on to which you insert DOM stuff (initially hidden). |
| enchilada/proxy-request | Returns a URL which will be proxied through self. |
| turtle.* | https://github.com/rm-hull/turtle graphics library |
| dommy.template/* | Templating based on Clojure's Hiccup html templating library. |
| monet.* | All the https://github.com/rm-hull/monet canvas drawing functions. |
| jayq.* | https://github.com/ibdknox/jayq jQuery bindings. |
| c2.* | Kerninglabs C2 data visualization library. |
| vomnibus.* | https://github.com/lynaghk/vomnibus bindings. |
| cljs.core.logic/* | MiniKanren implementation. |
| cljs.core.async/* | Communicating sequential processes implementation. |
| tailrecursion.priority-map/* | Clojurescript implementation of data.priority-map |
The following javascript libraries are loaded and available:
- http://jquery.com/ v2.0.1
- http://arborjs.org/ v0.9.2
- http://www.senchalabs.org/philogl/ v1.5.2
NOTE: This software is definitely alpha work-in-progress, please treat as such.
Examples
- WebGL Photospheres
- OM - Chess Demo
- 3D Polyhedra Taxonomy
- Big-Bang - Rock Paper Scissors
- Big-Bang - Parametric Equations
- OM mouse move vs. Big-Bang mouse move
- OM - Google Maps
- OM - Contacts Demo
- WebGL Planets
- Tumbling 3D Torus
- Boids!
- Dijkstra's Maze Solver
- US Choropleth C2
- World Choropleth C2
- Psychedelic Animation
- Quadratic Residues & Fixed Points
- 3D Auto-stereograms
- Champernowne's Constant and other transcendentals
- Flower of Life
- Turmites
- Chroma-Spirals
- Heighway Dragon
- Penrose Tiling
- Arnold's Cat-map
- ClojureScript says Boo!
- Turtle graphics demo
- Compilation error
- Ajax example (from stack overflow)
- Core.async - Daisy chain benchmark
- Core.async - Rob Pike
- Core.async - Hello world!
- Core.async - Martin Trojer's Sine Generator
- Core.async - Timothy Baldridge's Blocks
- Core.logic - simple demo
- Core.logic - Classic AI
- Core.logic - Unit Test Suite
- Core.logic - Einstein's Zebra Puzzle
- ClojureScript Quine
Prerequisites
You will need Leiningen 2.1.2 or above installed.
Running
To start a web server for the application, run:
$ lein ring serverThis will start the server at port 3000 or thereabouts. Then create your ClojureScript gist, and slot in the login and id, and hack on.
Optional: If a connection to a MongoDB database is supplied via config variable MONGODB_URL as below (substitute values for user, password, host and db as appropriate), then minimal usage stats will be written out for gamification purposes:
$ export MONGODB_URL=mongodb://user:password@host:10046/dbIf using heroku, add a config param:
$ heroku config:add MONGODB_URL=mongodb://user:password@host:10046/dbOptional: By default, Github aggressively throttles requests if requests are anonymous (60 requests per hour); Set GITHUB_OAUTH_TOKEN to a generated authentication token to increase the rate limit to 5000 requests per hour:
$ export GITHUB_OAUTH_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxor
$ heroku config:add GITHUB_OAUTH_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxx(See application note on authorizing 3rd party access to github here: http://developer.github.com/v3/oauth/#create-a-new-authorization)
Troubleshooting
Q. Why doesn't my clojurescript compile, it looks ok?
A1. Did you include a namespace? e.g. (ns example)
A2. Did you name it with a .cljs extension?
NEW! Now supports source maps
Clojurescript debugging/line-stepping in Chrome is now supported. And it works really well! :)
TODO
UI -> home page (carousel of recently viewed, most viewed, rated, etc)- UI -> allow in-page editing
Stats / tracking- More examples
- Documentation
Stop using local storage - using Heroku's ephemeral FS not so good for permanent storage (github, Amazon S3 instead?)Sitemap based on mongo-db rather than Heroku's ephemeral FS.- Automatic screenshot capability with https://github.com/ariya/phantomjs/wiki/Screen-Capture
Add CORS headers to proxyImplement simple big-bang (http://docs.racket-lang.org/teachpack/2htdpuniverse.html#(form._world._((lib._2htdp/universe..rkt)._big-bang)))
Known Bugs
Routing does not support private gists properlyFIXED: 21/12/2013- Arbor/PhiloGL externs don't work properly - must be compiled with no optimization
- Capture all error scenarios (inc. Google closure warnings and errors & trap javascript errors)
Contributing
If there are other ClojureScript (or JavaScript) libraries that would be useful to include, please create a new issue.
There is plenty to do, let me know if you can help out; submit a request for commit access.
References
- The (New) Turing Omnibus, A.K.Dewdney
- http://himera.herokuapp.com/index.html
- http://codepen.io/stuffit/pen/KrAwx
- http://js1k.com/2013-spring/demo/1362
- http://bl.ocks.org
- Closure Compiler Externs Extractor
License
Copyright © 2013 Richard Hull
Use/copy/fork as per: Creative Commons.
