ucblogo-code

I am not sure if this is what you mean, but the original UCBLogo (which I think is used in the Turtle Geometry book) is still alive and maintained[1] (not by the original authors, but Brian Harvey seems to chime in every now and then) and it does run well on modern computers. Now that I think about it, Logo seems to be pretty much a livecoding environment (not surprising given that it is a Lisp, but with less parentheses). You can define and edit functions from the REPL while the program continues with the same state, the same canvas. You can even pause e.g. a running procedure that draws a polygon, rotate and move the turtle and then continue the polygon procedure with that new state (at least this is possible with UCBLogo). [1]: https://github.com/jrincayc/ucblogo-code

Given the nature of variables and blocks in Logo you can do quite a bit. Like say you want to do a modulo-like operation: IF :SIZE > 100 [MAKE "SIZE :SIZE - 100] You could do: TO MODVAR :VARIABLE :AMOUNT IF THING :VARIABLE > :AMOUNT [MAKE :VARIABLE THING :VARIABLE - :AMOUNT] END MODVAR "SIZE 100 But even things like WHILE can be implemented: TO WHILE :COND :BLOCK IF :COND [EVAL :BLOCK WHILE :COND :BLOCK] END And the blocks are just lists, so you could potentially rewrite them. I was looking at Berkeley Logo to remind myself of the commands, and found that CASE (similar to switch) is implemented as a macro: https://github.com/jrincayc/ucblogo-code/blob/26ae6f01105832... – though it seems like it could be implemented just fine as a regular function. Though :caseignoredp is confusing me a bit... it's te

> The only thing I miss in (Berkeley) Logo is a better fill function. Thanks for volunteering! :) The code's at https://github.com/jrincayc/ucblogo-code

Berkeley Logo (brand new in version 6.1). I have compiled two versions, with and without wx. The file with the procedures is on github: https://github.com/pgtan/puzzles/blob/master/baum1.lg https://github.com/jrincayc/ucblogo-code