#!/bin/sh
# A dmenu prompt to unmount drives.
# Provides you with mounted partitions, select one to unmount.
# Drives mounted at /, /boot and /home will not be options to unmount.

unmountusb() {
	[ -z "$drives" ] && exit

	keys=$(echo -e "$drives" | awk '{ printf "%s (%s)\n", $2 != "null" ? $2 : $1, $3; }')
	hmap=$(echo -e "$drives" | awk '{ printf "[\"%s\"]=%s\n", $2 != "null" ? $2 : $1, $1; }')
	chosen="$(echo -e "$keys" | sort -r | dmenu -i -p "Unmount which drive?" | awk '{print $1}')"

	eval declare -A devices=($hmap)
	mp=${devices["$chosen"]}

	[ -z "$chosen" ] && exit
	sudo -A umount "$mp" && pgrep -x dunst && notify-send -i "$PIX/usb.svg" "$chosen unmounted."
	}

unmountandroid() { \
	chosen=$(awk '/simple-mtpfs/ {print $2}' /etc/mtab | dmenu -i -p "Unmount which device?")
	[ -z "$chosen" ] && exit
	fusermount -u "$chosen" && pgrep -x dunst && notify-send -i "$PIX/android.svg" "$chosen unmounted."
	}

asktype() { \
	case $(printf "USB\\nAndroid" | dmenu -i -p "Unmount a USB drive or Android device?") in
		USB) unmountusb ;;
		Android) unmountandroid ;;
	esac
	}

drives=$(lsblk -Jplf -o name,label,size,type,mountpoint | tr -d " \"{}" | sed 's/:\|,/ /g' | awk '/name/ && $NF != "null" && $NF !~/\/boot|\/home$|SWAP/&&length($NF)>1 && $8=="part" {print $2, $4, $6;}')

if ! grep simple-mtpfs /etc/mtab; then
	[ -z "$drives" ] && echo "No drives to unmount." &&  exit
	echo "Unmountable USB drive detected."
	unmountusb
else
	if [ -z "$drives" ]
	then
		echo "Unmountable Android device detected."
	       	unmountandroid
	else
		echo "Unmountable USB drive(s) and Android device(s) detected."
		asktype
	fi
fi