On Mon, Dec 13, 2021 at 6:27 PM Alexander Burger <a...@software-lab.de> wrote:
> > So I went ahead and implemented the extended 'fill' behavior. > > : (fill (1 ^(+ 1 1) 3)) > -> (1 2 3) > > To make it more consistent, I also changed the '~' read macro in the same > way. > Now this works: > > : (~(- 4 3) (2 ~(+ 1 2) 4) 5) > -> (1 (2 3 4) 5) > And why not following lisp tradition and use comma character (,) rather than caret character (^) for evaluating expressions? In fact fill is more or less analogous to backquote (`) (also known as quasiquote) in several lisps : `(1 2 3) -> (1 2 3) `(1 (+ 2 4) 3) -> (1 (+ 2 4) 3) `(1 ,(+ 2 4) 3) -> (1 8 3) '(1 ,(+ 1 2)) is short writting for (backquote (unquote (+ 1 2))) You can also introduce ,@ to insert flat lists like in: (let (x '(1 2)) `(1 ,x 2)) -> (1 (1 2) 2) (let (x '(1 2)) `(1 ,@x 2)) -> (1 1 2 2) Even if you don't want to implement quasiquote and unquote you can use tradicional symbols in fill, that is using , rather than ^ and maybe introducing ,@ also in fill see https://www.gnu.org/software/emacs/manual/html_node/elisp/Backquote.html
