Advent of code ... But in Elisp
reddit / emacs

----------------------------------------------------------------------
a-concerned-mother · 2022-12-16 16:39



----------------------------------------------------------------------
Primary-Wave2 · 2022-12-16 17:18

Impressive

----------------------------------------------------------------------
deafpolygon · 2022-12-16 18:01

I’d like to see more of this. :)

----------------------------------------------------------------------
kirankp89 · 2022-12-16 20:07

I actually solved this one with calc.

Replace all new lines with space. Replace double space with new line.
Rectangle select the buffer and do C-x * g, to grab selection into
calc vectors. In calc, do V M _ +, to sum the rows. Sort using V S.
Take the top entries.

----------------------------------------------------------------------
[deleted] · 2022-12-16 20:38

[deleted]

----------------------------------------------------------------------
Fearless_Process · 2022-12-17 02:50

I have also been doing some AoC in elisp!

Emacs Lisp is actually not a terrible little language and works pretty
well for the all of the AoC challenges I've done so far!

So far some of the features that have been useful:

* edebug for stepping through functions a single expression at a time
* rx for generating readable regexps for parsing the puzzle input
* seq which is a built in dash like library for working with lists
* cl-lib for things like structs and the loop macro
* cl-generic for dynamic dispatch
* eieio for some other method related stuff like the with-slots macro
* ert for writing test cases

That's about all I can think of right now. I was considering writing
an elisp interface to the AoC API, for downloading puzzle input and
submitting answers and whatnot, but so far I haven't gotten around to
it and am not sure whether it's worth it!

----------------------------------------------------------------------
arthurno1 · 2022-12-17 06:46

For those interested, there is a [Reddit for Advent of
Code](https://www.reddit.com/r/adventofcode/), and there are few more
days over there solved with Emacs Lisp, check under each day for the
solutions.

By the way, if anyone is interested, I am using this little yasnippet
to generate a little generic form when doing this:

    # -*- mode: snippet -*-
    # name: aoc-puzzle
    # key: aoc
    # --
    (defun day$1 ()
      (interactive)
      (let ((p1 0) (p2 0))
        (with-temp-buffer
          (insert-file-contents "input")
          $0
          (message "Part  I: %s\nPart II: %s" p1 p2))))

----------------------------------------------------------------------
casted · 2022-12-31 14:56

> I was considering writing an elisp interface to the AoC API, for
downloading puzzle input and submitting answers and whatnot.

https://github.com/keegancsmith/advent/blob/master/advent.el