Shorten CPU name and remove dir from wm

Add nixpkgs package to readme

README.md

@@ -7,6 +7,8 @@ fetch written in POSIX shell with no external commands
 
 ### Installing
 **Arch:** [fet.sh-git](https://aur.archlinux.org/packages/fet.sh-git/) (AUR)  
+**Nix:** [fet-sh](https://search.nixos.org/packages?show=fet-sh&query=fet-sh&channel=unstable) (nixpkgs-unstable)  
+**Gentoo:** [app-misc/fetsh](https://gpo.zugaina.org/Overlays/guru/app-misc/fetsh) (GURU overlay)  
 **Other Distros:** copy `fet.sh` to somewhere in $PATH
 
 ### Customization

fet.sh

@@ -7,33 +7,39 @@
 # supress errors
 exec 2>/dev/null
 set --
-_() {  # [ a = b ] with globbing
+eq() {  # equals  |  [ a = b ] with globbing
 	case $1 in
+		# if the second argument matches the first, exit normally
 		$2) return
+		# if it doesn't match, reverse the output of `:`, which makes an error
 	esac;! :
 }
 
-## Terminal
-
-[ "$XDG_CURRENT_DESKTOP" ] && wm="$XDG_CURRENT_DESKTOP"
-[   "$DESKTOP_SESSION"   ] && wm="$DESKTOP_SESSION"
+## DE
+wm="$XDG_CURRENT_DESKTOP"
+wm="$DESKTOP_SESSION"
 
 ## Distro
-o=/etc/os-release
-[ -f $o ] && . $o   # a common file that has variables about the distro
+# freedesktop.org/software/systemd/man/os-release.html
+# a common file that has variables about the distro
+for os in /etc/os-release /usr/lib/os-release; do
+	# some POSIX shells exit when trying to source a file that doesn't exist
+	[ -f $os ] && . $os && break
+done
 
 if [ -e /proc/$$/comm ]; then
+	## Terminal
 	while [ ! "$term" ]; do
 		# loop over lines in /proc/pid/status until it reaches PPid
 		# then save that to a variable and exit the file
 		while read -r line; do
-			_ "$line" "PPid*" && ppid=${line##*:?} && break
+			eq "$line" "PPid*" && ppid=${line##*:?} && break
 		done < "/proc/${ppid:-$PPID}/status"
 
 		# get name of binary
 		read -r name < "/proc/$ppid/comm"
 		case $name in
-			*sh|"${0##*/}"|tmux*) ;;  # skip shells
+			*sh|"${0##*/}") ;;  # skip shells
 			*[Ll]ogin*|*init*) break;;  # exit when the top is reached
 			*) term="$name"  # anything else can be assumed to be the terminal
 		esac
@@ -47,7 +53,7 @@ if [ -e /proc/$$/comm ]; then
 		for i in /proc/*/comm; do
 			read -r c < "$i"
 			case $c in
-				awesome|xmonad|qtile|i3*|box*|*wm*) wm="$c"; break;;
+				awesome|xmonad*|qtile|sway|i3|*box*|*wm*) wm="${c%%-*}"; break;;
 			esac
 		done
 
@@ -55,7 +61,7 @@ if [ -e /proc/$$/comm ]; then
 	# loop over lines in /proc/meminfo until it reaches MemTotal,
 	# then convert the amount (second word) from KB to MB
 	while read -r line; do
-		_ "$line" "MemTotal*" && set -- $line && break
+		eq "$line" "MemTotal*" && set -- $line && break
 	done < /proc/meminfo
 	mem="$(( $2 / 1000 ))MB"
 
@@ -77,7 +83,7 @@ if [ -e /proc/$$/comm ]; then
 	## Kernel
 	read -r _ _ version _ < /proc/version
 	kernel="${version%%-*}"
-	_ "$version" "*Microsoft*" && ID="fake $ID"
+	eq "$version" "*Microsoft*" && ID="fake $ID"
 
 	## Motherboard // laptop
 	read -r model < /sys/devices/virtual/dmi/id/product_name
@@ -87,7 +93,7 @@ if [ -e /proc/$$/comm ]; then
 	# then save the argument count to $pkgs
 	set --
 	[ -d /var/db/kiss/installed ] && set -- /var/db/kiss/installed/*
-	[ -d /var/lib/pacman/local  ] && set -- /var/lib/pacman/local/*
+	[ -d /var/lib/pacman/local  ] && set -- /var/lib/pacman/local/[0-9a-z]*
 	[ -d /var/db/xbps ] && set -- /var/db/xbps/.*
 	[ -d /var/db/pkg  ] && set -- /var/db/pkg/*/*  # gentoo
 	pkgs=${###0}
@@ -190,9 +196,11 @@ elif v=/System/Library/CoreServices/SystemVersion.plist; [ -f "$v" ]; then
 	done < "$v"
 fi
 
+eq "$0" "*fetish" && printf 'Step on me daddy\n' && exit
+
 ## GTK
 while read -r line; do
-	_ "$line" "gtk-theme*" && gtk="${line##*=}" && break
+	eq "$line" "gtk-theme*" && gtk="${line##*=}" && break
 done < "${XDG_CONFIG_HOME:=$HOME/.config}/gtk-3.0/settings.ini"
 
 # Shorten $cpu and $vendor
@@ -205,6 +213,7 @@ cpu="${cpu%% CPU}"
 cpu="${cpu##CPU }"
 cpu="${cpu##*AMD }"
 cpu="${cpu%% with*}"
+cpu="${cpu% *-Core*}"
 
 col() {
 	printf '  '
@@ -227,7 +236,7 @@ for i in $info; do
 		n) echo;;
 		os) print os "$ID";;
 		sh) print sh "${SHELL##*/}";;
-		wm) print wm "$wm";;
+		wm) print wm "${wm##*/}";;
 		up) print up "$up";;
 		gtk) print gtk "${gtk# }";;
 		cpu) print cpu "$vendor$cpu";;