theme.park/docker-mods/radarr/root/etc/cont-init.d/98-themepark

#!/command/with-contenv bash 

echo '---------------------------'
echo '|  Radarr theme.park Mod  |'
echo '---------------------------'

# Display variables for troubleshooting 
echo -e "Variables set:\\n\
'TP_DOMAIN'=${TP_DOMAIN}\\n\
'TP_COMMUNITY_THEME'=${TP_COMMUNITY_THEME}\\n\
'TP_SCHEME'=${TP_SCHEME}\\n\
'TP_ADDON'=${TP_ADDON}\\n\
'TP_THEME'=${TP_THEME}\\n"

APP_FILEPATH='/app/radarr/bin/UI/index.html'
LOGIN_FILEPATH='/app/radarr/bin/UI/login.html'
if [ "${TP_HOTIO}" = true ]; then
    echo 'Changing to Hotio file path!'
    APP_FILEPATH='/app/bin/UI/index.html'
    LOGIN_FILEPATH='/app/bin/UI/login.html'
fi

# Set default
if [[ -z ${TP_DOMAIN} ]]; then
    echo 'No domain set, defaulting to theme-park.dev'
    TP_DOMAIN='theme-park.dev'
fi
if [[ -z ${TP_SCHEME} ]]; then
    echo 'No scheme set, defaulting to https'
    TP_SCHEME='https'
fi

THEME_TYPE='theme-options'
if [ "${TP_COMMUNITY_THEME}" = true ]; then
    THEME_TYPE='community-theme-options'
fi

case ${TP_DOMAIN} in
  *"github.io"*)
  echo "Switching to github.io URL style"
    TP_DOMAIN="${TP_DOMAIN}\/theme.park"
    ;;
esac

if [[ -z ${TP_THEME} ]]; then
    echo 'No theme set, defaulting to organizr'
    TP_THEME='organizr'
fi

# Adding stylesheets
if ! grep -q "${TP_DOMAIN}/css/base" "${APP_FILEPATH}"; then
    echo '---------------------------'
    echo '|  Adding the stylesheets |'
    echo '---------------------------'

    url_base="${TP_SCHEME}://${TP_DOMAIN}"
    sheets="<link rel='stylesheet' href='${url_base}/css/base/radarr/radarr-base.css'>"
    sheets="${sheets} <link rel='stylesheet' href='${url_base}/css/${THEME_TYPE}/${TP_THEME}.css'>"
    printf 'Stylesheet set to %s\n' "${TP_THEME}"

    if [[ -n ${TP_ADDON} ]]; then
        for addon in $(echo "$TP_ADDON" | tr "|" " "); do
        sheets="${sheets} <link rel='stylesheet' href='${url_base}/css/addons/radarr/${addon}/${addon}.css'>"
        printf 'Added custom addon: %s\n\n' "${addon}"
        done
    fi

    sed -i "s!</body>!${sheets}</body>!g" "${APP_FILEPATH}"
    sed -i "s!</body>!${sheets}</body>!g" "${LOGIN_FILEPATH}"
    printf 'Stylesheets inserted.'
fi