note

#!/usr/bin/env bash
#
# note-cli – einfaches Notiz-Tool
#
# Speichert Notizen unter .notes/db/<hash>, wobei <hash> der SHA1-Hash
# des Inhalts ist (analog zu Git-Blobs).

set -euo pipefail

NOTES_DIR=".notes/db"

usage() {
    echo "Usage: note add <text>"
    echo "       note list"
    echo "       note delete <hash>"
    exit 1
}

cmd_add() {
    if [[ $# -eq 0 ]]; then
        echo "Fehler: Kein Text angegeben." >&2
        usage
    fi

    local content="$*"

    mkdir -p "$NOTES_DIR"

    # Hash über den Inhalt berechnen (SHA1, wie git hash-object)
    local hash
    hash=$(printf '%s' "$content" | sha1sum | awk '{print $1}')

    local filepath="$NOTES_DIR/$hash"

    if [[ -f "$filepath" ]]; then
        echo "Notiz existiert bereits: $hash"
        return 0
    fi

    printf '%s' "$content" > "$filepath"
    echo "Notiz gespeichert: $hash"
}

cmd_list() {
    if [[ ! -d "$NOTES_DIR" ]] || [[ -z "$(ls -A "$NOTES_DIR" 2>/dev/null)" ]]; then
        echo "Keine Notizen vorhanden."
        return 0
    fi

    local file
    local hash
    local content

    for file in "$NOTES_DIR"/*; do
        hash=$(basename "$file")
        content=$(cat "$file")
        echo "$hash  $content"
    done
}

cmd_delete() {
    if [[ $# -eq 0 ]]; then
        echo "Fehler: Kein Hash angegeben." >&2
        usage
    fi

    local hash="$1"
    local filepath="$NOTES_DIR/$hash"

    if [[ ! -f "$filepath" ]]; then
        echo "Fehler: Keine Notiz mit Hash '$hash' gefunden." >&2
        exit 1
    fi

    rm "$filepath"
    echo "Notiz gelöscht: $hash"
}

main() {
    if [[ $# -eq 0 ]]; then
        usage
    fi

    local command="$1"
    shift

    case "$command" in
        add)
            cmd_add "$@"
            ;;
        list)
            cmd_list "$@"
            ;;
        delete)
            cmd_delete "$@"
            ;;
        *)
            usage
            ;;
    esac
}

main "$@"