Formatting, syntax highlighting, and parenthesis checking

[MikeBeller]

Janet-playground should support at least some level of syntax-aware editing. At a minimum it should be possible to click "format" to format the code, and when typing a ) the matching ( should become highlighted. At a maximum, full syntax-aware editing could be implemented.

Possible approaches that have been suggested:

• https://ace.c9.io -- syntax aware editor. (Could try it with the clojure syntax module, or might have to write our own.)
• using tree-sitter https://github.com/GrayJack/tree-sitter-janet/
• maybe something very simple like using spork/fmt for formatting the code (would require including spork in the playground but I want to do that anyway, and using javascript to find the matching paren when you type a ).

[pepe]

Just by looking at the front page of ace, there is the option to import .tmlanguages, for which exists generator in Janet https://github.com/janet-lang/janet/blob/master/tools/tm_lang_gen.janet.

And ace looks OK.

[MikeBeller]

Ah -- thanks @pepe! I will check it out.

[MikeBeller]

Syntax highlighting and parens matching added. I just used clojure mode as a quick fix (because it looked much easier than tmlanguage integration). I will leave this issue open because what is there is not perfect clearly.