rofi-insect.sh

#!/usr/bin/env bash

# Rofi integration for insect (/~https://github.com/sharkdp/insect)
# Copying to the clipboard requires xsel
# Modified from: /~https://github.com/onespaceman/menu-calc

function usage() {
    echo "$(tput bold)rofi-insect calculator plugin$(tput sgr0)
An insect (fancy calculator that does unit conversions) plugin for Rofi or dmenu

This script supports (almost) anything insect does.
The previous result is ALWAYS passed as the first argument

$(tput bold)Clear if results start not making sense!$(tput sgr0)

Report bugs at: /~https://github.com/alichtman/rofi-insect/issues/new"
    exit
}

######
# MAIN
######


case "$1" in
    -h|-help|--help|help) usage ;;
esac

if [[ -n $(command -v rofi) ]]; then
    menu="$(command -v rofi) -dmenu"
elif [[ -n $(command -v dmenu) ]]; then
    menu="$(command -v dmenu)"
else
    echo >&2 "Rofi or dmenu not found"
    exit
fi

input="$*"
answer=$(echo "$input" | insect)
action=$(echo -e "Copy to clipboard\nClear\nClose" | $menu -i -p "$input = $answer") # See $ man dmenu for an explanation these options

case $action in
    "Clear") $0 ;;
    "Copy to clipboard") echo -n "$input = $answer" | awk '{$1=$1};1' | xsel -ib ;; # The awk expression trims whitespace: https://unix.stackexchange.com/a/205854/321263
    "Close") ;;
    "") ;;
    *) $0 "$answer $action" ;;
esac