function edit(){
# Requires: $EDITOR, $NOTE
# Optional: $ENCRYPTION, $TMP_DIR, $SESSION_ID, decrypt, encrypt

# Verify an editor was specified
if [ -z "$EDITOR" ]; then
    >&2 printf "  $RED_COLOR!$RESET_COLOR %s\n"\
     "No editor specified in environment."
    exit
# Verify the note exists
elif [ ! -r "$NOTES_DIR/$NOTE" ]; then
    >&2 printf "  $RED_COLOR!$RESET_COLOR %s\n"\
     "Note cannot be opened for editing."
    exit 40;
fi

# If encryption is enabled, decrypt $NOTE to a temp file, otherwise
# operate on the note directly.
if [ "$ENCRYPTION" == "TRUE" ]; then
    cp "$NOTES_DIR/$NOTE" "$NOTES_DIR/$NOTE.bk" #Insurance
    TMP_NOTE="$TMP_DIR/$SESSION_ID"
    decrypt > "$TMP_NOTE"
else
    TMP_NOTE="$NOTES_DIR/$NOTE";
fi

# Write an ammendment header
if [ -z "$CREATE" ]; then
    printf "\n%s\n" "edit - $(date "$DATE_FMT")" >> "$TMP_NOTE"
    printf "%s\n" "===================================" >> "$TMP_NOTE"
fi

# Call the editor
printf "  - %s\n" "editing ${NOTE%.*}"
"$EDITOR" "$TMP_NOTE"

# If the file was previously decrypted, encrypt it back
if [ "$ENCRYPTION" == "TRUE" ]; then
    echo "reencrypting"
    rm "$NOTES_DIR/$NOTE"
    encrypt;
    rm "$TMP_NOTE"
    if [ ! -r "$NOTES_DIR/$NOTE" ]; then
        >&2 printf "  $RED_COLOR!$RESET_COLOR %s\n" "error: note was not saved."
        cp "$NOTES_DIR/$NOTE.bk" "$NOTES_DIR/$NOTE"
    else
        rm "$NOTES_DIR/$NOTE.bk";
    fi
fi

}