Homepage: https://git.sr.ht/~tarsius/llama
Author: Jonas Bernoulli
Updated:
Anonymous function literals
This package implements compact syntax for short `lambda's, without
relying on a C patch to Emacs or adding an additional pair of
parentheses.
[!] I have come up with another approach that does not put anything
[!] before the opening parenthesis: https://git.sr.ht/~tarsius/l.
Unfortunately anonymous function literals won't be added to Emacs
anytime soon. The arguments as to why we would like to have that
has been layed out convincingly but the proposal has been rejected
anyway.
Several packages exist that implement anonymous function literals,
but until now they all either are waiting for a patch to the C part
be merged into Emacs, or they depart too far from the ideal syntax.
In a stroke of luck I discovered a loophole that allows us to have
almost the syntax that we want without having to convince anyone.
$(foo %) is what I would have used if it were up to me.
#(foo %) works just as well for me.
##(foo %) is similar enough to that.
(##foo %) is the loophole that I discovered.
Even though there is no space between the second # and `foo', this
last form is read as a list with three arguments (## foo %) and it
is also indented the way we want!
(##foo %
bar)
This is good enough for me, but with a bit of font-lock trickery,
we can even get it to be display like this:
##(foo %
bar)
This is completely optional and you have to opt-in by enabling
`llama-mode' (or the global variant `global-llama-mode').
An unfortunate edge-case exists that you have to be aware off; if
no argument is placed on the same line as the function, then Emacs
does not indent as we would want it too:
(##foo ##(foo
bar) which llama-mode displays as bar)
I recommend that in this case you simply write this instead:
(## foo ##( foo
bar) which llama-mode displays as bar)
It is my hope that this package helps to eventually get similar
syntax into Emacs itself, by demonstrating that this is useful and
that people want to use it.