BlendScript is a small functional programming language designed for ergnonomic, repeatable editing in Blender. Where possible it uses the same number of keystrokes as the UI would require, and it's designed to be run in a live Python editor with the source embedded as a raw string:
import blendscript
blendscript.live(r'''
# your code here
''')You can also run an offline REPL without loading Blender-specific libraries:
$ ./repl -c '/+[1,2,3]'
6
$ ./repl
>>> f(+7) L*fi5
[7, 8, 9, 10, 11] :: ([] .) (2ms)
>>>...and for debugging the language itself, you can run a Python repl with preloaded imports:
$ ./repl -p
>>> val_expr(b'+ 3 4', 0)BlendScript's operators use Łukasiewicz notation (prefix notation, the opposite of stack-oriented Reverse Polish Notation) and support automatic currying and sections, just like operator sections in Haskell. Parentheses are often optional; when present, they provide a Lisp-style syntax:
+ 3 * 4 5 # no parens required
(+ 3 (* 4 5)) # same thing, with parens
This works because BlendScript uses type information to try to figure out how to fold things up when it appears to be ambiguous. (We'll eventually have a variant of Hindley-Milner; for now it's partially typed and often falls back to dynamic/unknown types.)
let-bindings are achieved by writing an unbound identifier followed by a
value; the value immediately following such a binding will be parsed within a
lexical scope that binds the name you provided:
>>> f (+ 1) f 5
6
>>> :f (+ 1) f 5 # explicit : operator
6
TODO: document this
...for now, you can check out runtime/val.py.