falloutphil

Interfacing C with Emacs Lisp

Introduction

This document provides a step-by-step guide for interfacing C with Emacs Lisp, designed for readers familiar with basic Ubuntu, C, and Emacs usage.

Installing Necessary Tools

GNU Scientific Library (GSL)

Install GSL: sudo apt-get install libgsl-dev

Emacs

(I compiled Emacs 29.1 from source, but this should also work)

Install Emacs: sudo apt-get install emacs

There is no WSL or Multipass on Guix, but we can get the same thing with QEmu (and a lot more). But it’s a bit trickier to get started!

Guix packages required:

qemu (possibly can get away with minimal package)
cloud-utils (for cloud-localds)
cdrkit-libre (for genisoimage, used by cloud-localds)

Create the following user data file - there may be more in this than you need.

To test we create a file much larger than we’d read in with a typical AoC question - let’s mimic day 11 of 2021 (also valid for day 09 too) available here.

shuf -i 1000000000-9999999999 -n 10000000 -o big_test.txt

With a file this big, my original solution runs out of memory due to garbage collection issues. The problem here was misunderstanding eager comprehensions - the nested map should be part of the list comprehension itself not applied afterwards!

A good link about comprehensions in Scheme for reference.

Keybase proof

I hereby claim:

I am falloutphil on github.
I am beadling (https://keybase.io/beadling) on keybase.
I have a public key ASCCElQg9BPs7FyCLB9hglmwpwjNUQrrFj-VvZtLLkFUaQo

To claim this, I am signing this object:

	Can be used from qemu Ubuntu instance (see other gist).

	Clone and build this on the host:
	https://github.com/ponty/framebuffer-vncserver

	Run it as root:
	sudo ./framebuffer-vncserver -t /dev/input/by-path/platform-i8042-serio-1-event-mouse -k /dev/input/by-path/platform-i8042-serio-0-event-kbd

	You can use the direct /dev/input/eventX as well if you want.

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
	<!--
	Noto Mono + Color Emoji Font Configuration for KDE/Konsole

	Konsole/KDE apps use QT rather than the GTK emoji setup. So standard Ubuntu setup doesn't seem to work.
	https://bugs.launchpad.net/ubuntu/+source/kubuntu-meta/+bug/1767390

	If you want the Snake emoji in your Python venv Powerline then see below!

	To get windmove to work and stuff like this: https://ebzzry.io/en/emacs-pairs/

	https://unix.stackexchange.com/questions/76566/where-do-i-find-a-list-of-terminal-key-codes-to-remap-shortcuts-in-bash
	https://emacs.stackexchange.com/questions/977/shiftup-isnt-recognized-by-emacs-in-a-terminal/989#989

	Settings -> Edit Current Profile -> Keyboard

	But also check that it's not overridden in Settings -> Configure Shortcuts

	S-Up \E[1;2A

	#!/bin/bash
	# Modified Pi-hole script to generate a generic hosts file
	# for use with dnsmasq's addn-hosts configuration
	# original : https://github.com/jacobsalmela/pi-hole/blob/master/gravity-adv.sh
	# taken from: https://gist.github.com/chrisvella/5f3a18f1e442153cd685#file-make-mega-adblock-hostsfile-sh

	# You can also get more blocks from:
	# https://www.hostsfile.org/hosts.html
	# Specifically:
	# https://www.hostsfile.org/Downloads/BadHosts.unx.zip