a function to help record interesting command in bash

tnotefunction.sh

## Put this function inside .bashrc for a good time ;) 
export NOTE="$HOME/terminalnotes.md"
function tnote() {
    ## Append what we have first
    history -a
    ## Traping CTRL+C to return to terminal
    trap 'return' SIGINT
    CHOICE=18 ## Set default choice to the command before calling tnote
    while true
    do
    CHOICE=n=$(($CHOICE%22))
    clear
    HISTORY_ENTRIES=`history | tail -n 20`
    SAVEIFS=$IFS   # Save current IFS
    IFS=$'\n'      # Change IFS to new line
    HISTORY_ARRAY=($(echo "$HISTORY_ENTRIES"  | awk '{ $1 = ""; print $0;}' |  sed 's/^ *//g';echo "\033[41mEnter your own command\033[0m";echo "\033[41mUse clipboard\033[0m")) # Turn last 20 history entries into array
    IFS=$SAVEIFS   # Change IFS back
    CURRENTCOMMAND="${HISTORY_ARRAY[$CHOICE]}"

    echo "Last few entries in your history are:"

    for option in `seq 0 21`
    do
      if [[ $option -eq $CHOICE ]]; then
        echo -e "\033[93m $option\t${HISTORY_ARRAY[$option]} \033[0m"
      else
        echo -e "\033[35m $option\033[0m\t${HISTORY_ARRAY[$option]}"
      fi
    done

    echo "---------------------------------"
    echo "Default choice: $CURRENTCOMMAND"
    echo ""
    exec 3<>/dev/tty
    read -r -sn1 -p "Use arrow key to choose command: " choice
    case $choice in
        A) CHOICE=$(($CHOICE-1)); continue ;; # Up
        B) CHOICE=$(($CHOICE+1)); continue ;; # Down
        # C) echo right; continue ;;
        # D) echo left; continue ;;
        '') echo "" ;; # Enter key
        *) continue ;; # Ignore everything else
    esac
    cmd="$CURRENTCOMMAND"
    if [[ $CHOICE -eq 20 ]]; then
       read -u 3 -p "Enter custom command: " cmd
    fi
    if [[ $CHOICE -eq 21 ]]; then
       cmd=`xclip -selection clipboard -o`
    fi

    if [ "$cmd" != "" ]; then
            echo -e "\nYou picked: \033[0;34m$cmd\033[0m"
            read -u 3 -p "Enter descriptions: " desc
            echo -e "\n$desc\n" >> $NOTE
            echo '```bash' >> $NOTE
            echo "$cmd" >> $NOTE
            echo '```' >> $NOTE
            echo -e "Note is appended to \033[0;32m$NOTE\033[0m\n"
            break
    fi
    echo "Pick again"
    done
}

function tnotefind() {
    pattern=$(echo "$@"|sed 's/ /(.(?<!\\`\\`\\`))*?/g')
    findregex="(?s)\`\`\`bash(.(?<!\`\`\`))*?$pattern(.(?<!\`\`\`))*?\`\`\`\n"
    grep -Pzo "$findregex" $NOTE  | sed 's/\x0//g' |consolemd
}