fet.sh/posixfetch

#!/bin/sh
#
#  this is my attempt at trying to make a fetch using only posix shell
#  and as little if none external utilities as I can.


## Terminal
ppid() {
	while read -r line; do
		case $line in
			PPid*) echo "${line##*:?}"; break;;
		esac
	done < /proc/"$1"/status
}

while [ ! "$term" ]; do
	read -r name < "/proc/${ppid:=$$}/comm"
	case $name in
		*sh) ;;
		"${0##*/}") ;;
		*[Ll]ogin*|*init*) term=linux;;
		*) term="$name";;
	esac
	ppid=$(ppid "$ppid")
done

## Distro
. /etc/os-release   # lol EZ

## Packages
# horribly inefficient, I know.
[ -d /var/lib/pacman/local ] && {
	pkgs=0
	for _ in /var/lib/pacman/local/*; do
		pkgs=$(( pkgs + 1 ))
	done
}

[ -d /var/db/xbps ] && {
	pkgs=0
	for _ in /var/db/xbps/*; do
		pkgs=$(( pkgs + 1 ))
	done
}

[ -d /var/db/pkg ] && {
	pkgs=0
	for _ in /var/db/pkg/*/*; do
		pkgs=$(( pkgs + 1 ))
	done
}

print() {
	printf '\033[38;05;16m%8s\033[0m | %s\n' "$1" "$2"
}

print os "$ID"
print sh "${SHELL##*/}"
print term "$term"
[ "$pkgs" ] && print "pkgs" "$pkgs"