Re: Tree-sitter integration on feature/tree-sitter

[Yuan Fu <casouri@gmail.com>]

I forgot to mention the changes I made prior to pushing:
- Changed prefix to treesit-
- Now language definitions are referred to as 'c and 'python, rather than 'tree-sitter-c and 'tree-sitter-python (because we changed the prefix)
- New variable treesit-extra-load-path that lets the user use different load-paths for language definitions

These are the changes we agreed on in the old thread. I also added a new indentation preset parent-bol, as suggested by Theodor.

> The easiest way to play with it is to use some provided major mode that
> implements it.  I've made one here for golang, for reference:
> https://git.sr.ht/~theo/dotfiles/tree/master/item/emacs/.emacs.d/lisp/go-mode.el.
> 
> This can easily be modified to use 'tree-sitter-c instead

So now 'tree-sitter-c should be 'c.

> 
> To make this work you need the definition compiled and put on some path
> that emacs can see.  The suggested one is LD_LIBRARY_PATH, and I start
> emacs using something like this:
> 
> ```
> LD_LIBRARY_PATH=/home/theo/src/tree-sitter-module/dist /path/to/tree-sitter-enabled-emacs/src/emacs
> ```

Now you can use tree-sitter-extra-load-path

> 
> This is using the scripts provided by Yuan Fu in the tree-sitter-modules
> repo.  When the major mode is enabled, you can start querying the
> document by using the provided functions, such as:
> 
> ```elisp
> (tree-sitter-node-start
>  (tree-sitter-node-at (point) (point) 'tree-sitter-go))
> ```
> 
> `M-x tree-sitter-inspect-mode` shows what node you are on in the mode
> line.  It helps with debugging.
> 
> By 'play with it', I guess we can implement folding, highlighting,
> navigation, simple rename functionality, Imenu etc etc.

Now you should use treesit- prefix.

Thanks,
Yuan