Circa is a programming language for live coding, in development

How can you have a website displaying a live-coding language, without a video displaying someone actually live-coding? :P<p>Seriously though, I'd love to see a video of someone doing live-coding. I've been looking for a good live-coding environment ever since I found fluxus[1], and subsequently found out that development of it had stopped.<p>[1] <a href="http://www.pawfal.org/fluxus/" rel="nofollow">http://www.pawfal.org/fluxus/</a>

Obligatory mention of "Inventing on Principle" by Bret Victor (<a href="https://vimeo.com/36579366" rel="nofollow">https://vimeo.com/36579366</a>) which explores a lot of similar turf. With Circa though we get to have these things today though, and with C integration to boot. Great work.

I initially shrugged and said "gee, another programming language," but as I've been looking, I just see more and more to squee about.<p>They aren't the decisions I'd have made but they're good decisions. The inlined state stuff especially looks exciting and clever.

Significant whitespace in a live coding language? I like and use Python, but that seems like a show-stopper of a bad idea for a language designed for throwing code around in real time.

Using # for both comments and colors does not sound like a good idea! Just stick to --, I think. It looks prettier anyhow :P.<p>Also, how do you do scoping without a var or val keyword? E.g. what if I want to have a variable local to a function (or method, I guess?). Or what if I want to reassign a variable outside of the current scope?

I wish more languages had the right-apply function. It looks similar to piping and sounds great.

Anyone got it working?<p>I managed to compile both build/circa and build/circa_d (build/circa_t is broken).<p><pre><code> circa ➤ export CIRCA_HOME=`pwd` ~CIRCA_HOME ➤ export PATH=$PATH:$CIRCA_HOME/build ~CIRCA_HOME ➤ python tools/prebuild.py ~CIRCA_HOME ➤ scons build/circa build/circa_d </code></pre> I can run the tests:<p><pre><code> ~CIRCA_HOME ➤ tools/ca-tests.py Ran 105 tests, 0 failed, 11 disabled. </code></pre> But I can't launch the repl (circa_d --repl) nor get anything from the samples. On some of the samples I get errors, on others I get nothing.<p>Am I missing something?

I always wonder why so many languages eschew multiline comments. Is it monumentally harder to make a parser that supports it or is this a conscious decision?

When I saw the wall appear and get moved I instantly thought about some variation of a programmers pong of sorts. Or other games!

Code reflection seems like an awesome feature to play around with, and it seems really cool that you can modify the AST and have the changes saved back to the source text.<p>Until Cicra is ready, where else can I learn to use these features?

I really like this! One thing that wasn't shown is having variables in the CPP code get modified from in game. Would that be possible?