With a shared MPD server, sometimes other people will add shit music. Stop the rot. Also watch Christmas genre and limit it to specific date range.

mpc-guardian.sh

#!/usr/bin/env bash

# Automatically removes songs from your playlist that match a blacklist or the Christmas genre
# unless it is between the day after U.S. Thanksgiving and before January 15.

BLACKLIST=/var/music/blacklist.txt
MPD_HOST=localhost
REJECT_GENRE="Christmas"

# Define the date range
START_DATE=$(date -d "fourth Thursday of November + 1 day" +%Y-%m-%d) # Day after Thanksgiving
END_DATE=$(date -d "January 15" +%Y-%m-%d)

[ -f "$BLACKLIST" ] || touch "$BLACKLIST"

is_outside_date_range() {
    local today=$(date +%Y-%m-%d)
    [[ "$today" < "$START_DATE" || "$today" > "$END_DATE" ]]
}

while :; do
    # Get the currently playing song
    CURRENT_SONG=$(mpc current)

    # Check against the blacklist
    if echo "$CURRENT_SONG" | grep -i -f "$BLACKLIST" > /dev/null; then
        echo "Removing blacklisted song: $CURRENT_SONG"
        mpc del "$(mpc status -f %position% | head -1)"
        sleep 5
        continue
    fi

    # Get genre information for the current song
    GENRE=$(mpc --format "%genre%" current)

    # Remove the song if it's in the rejected genre and outside the allowed date range
    if [[ "$GENRE" =~ $REJECT_GENRE ]] && is_outside_date_range; then
        echo "Removing song from rejected genre ($REJECT_GENRE) outside the allowed date range: $CURRENT_SONG"
        mpc del "$(mpc status -f %position% | head -1)"
    fi

    sleep 5
done