youtube-subscriber

#!/bin/sh

readonly OUTPUT_FMT="%(uploader)s [%(upload_date)s] - %(title)s.%(ext)s"
readonly COOKIES_FILE="$(dirname "$0")/.config/cookies.txt"
readonly ONLY_DOWNLOAD_LAST_N="10"

SYNC="0"
if [ "$1" = "sync" ]; then
    # Add a channel; i.e. prefill the cache
    SYNC="1"
    
elif [ $# -eq 1 ]; then
    # Download only a single video
    set -v
    youtube-dl --cookies "$COOKIES_FILE" \
               --format "248+251/247+251/bestvideo+bestaudio" \
               --output "$OUTPUT_FMT" \
               "$1"
    exit 0
elif [ $# -gt 1 ]; then
    echo "Error: too many arguments" >&2
    exit 1
fi

for channel_dir in "$(dirname "$0")"/.config/*/; do
    channel_url="$(cat "${channel_dir}url.txt")"
    channel_archive="${channel_dir}archive.txt"

    # To fill the archive files without downloading the videos, use:
    if [ "$SYNC" = "1" ]; then
        youtube-dl --download-archive "$channel_archive" --get-id "$channel_url" \
                | sed 's/^/youtube /g' \
                | tail --lines="+$ONLY_DOWNLOAD_LAST_N" >"$channel_archive"'.$$'
        mv "$channel_archive" "$channel_archive.old"
        cat "$channel_archive"'.$$' "$channel_archive.old" | sort --unique >"$channel_archive"
        rm "$channel_archive"'.$$' "$channel_archive.old"
    fi
    
    # Download the new videos
    youtube-dl --cookies "$COOKIES_FILE" \
               --format "248+251/247+251/bestvideo+bestaudio" \
               --output "$OUTPUT_FMT" \
               --download-archive "$channel_archive" \
               "$channel_url"
done