qnote

#!/bin/bash

NOTES_FILENAME="/home/${USER}/.cli-quick-notes.txt"

# check if the file exists
if [[ ! -e "$NOTES_FILENAME" ]]; then
    touch "$NOTES_FILENAME"
fi

check_occurrence() {
    local note=$1
    if grep -q -x "$note" "$NOTES_FILENAME"; then
        echo "Error: the note '$note' already exists."
        exit 1
    fi
}

add_note() {
    local note=$(echo "$1" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
    check_occurrence "$note"
    if [[ -z "$note" ]]; then # shows all notes
        nl -b a "$NOTES_FILENAME"
        exit 0
    fi
    echo "$note" >>"$NOTES_FILENAME"
}

case "$1" in
-h | --help)
    echo -e "\e[1mUsage:\e[0m"
    echo "  qnote                                      Displays all notes."
    echo "  qnote [-a|--add] <note>                    Adds a note at the end."
    echo "  qnote <note>                               Adds a note at the end."
    echo "  qnote -h|--help                            Display this help text."
    echo "  qnote [-r|-d|--remove|--delete] <index>    Removes a note by its index (position or line number)."
    echo "  qnote [-c|--clear]                         Removes all the notes."
    ;;
-a | --add)
    shift
    add_note "$1"
    ;;
-r | -d | --remove | --delete)
    sed -i "${2}d" "$NOTES_FILENAME"
    ;;
-c | --clear)
    echo -n "" >"$NOTES_FILENAME"
    ;;
*)
    add_note "$1"
    ;;
esac

exit 0 # ok error