capture_input.sh - reads non-meta keystrokes from a bash shell (for key-operated menus and interfaces)

capture_input.sh

#!/bin/bash

function capture_input(){
    export CAPPING=true
    export SSTTY
    if [[ "$(stty --save 2>/dev/null)" == "" ]]; then
        SSTTY="$(stty -g)" #BASH
    else
        SSTTY="$(stty --save)" #ZSH
    fi    
    trap sigint_handler SIGINT
    keycap
}

function keycap(){
    [[ "$CAPPING" == false ]] && return 1
    command stty -echo -icanon -icrnl time 0 min 0
    keypress=''
    while [[ "x$keypress" == "x" && "$CAPPING" == true ]]; do
        echo -ne '>\r'
        keypress="$(cat -v)"
    done

    echo "KEY :: '$keypress'"
    [[ "$CAPPING" == true ]] && keycap "$SSTTY"
}

function sigint_handler(){
    echo "Killed by user"
    CAPPING=false
    stty $SSTTY
    trap '' INT
    return 1
}

capture_input