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#!/usr/bin/env bash
# Wrapper for nitrogen setting the freedesktop.org AccountsService/BackgroundFile so LightDM wallpaper is synced.
# Inspired by <https://rafaelc.org/posts/sync-wm-wallpaper-with-lightdm-on-linux-mint/>
key_value_retriever(){
KEY="${1}"
if [[ -z "${KEY}" ]]; then
printf "ERROR: KEY should not be empty\n"
return
fi
FILE="${2}"
if [[ ! -f "${FILE}" ]]; then
printf "ERROR: Cannot find FILE: %s\n" "${FILE}"
return
fi
VALUE_VARNAME="${3}"
if [[ -z "${VALUE_VARNAME}" ]]; then
printf "ERROR: VALUE_VARNAME should not be empty\n"
return
fi
MATCH=$(grep -m1 "^[[:space:]]*${KEY}=" "${FILE}")
INDEX_OF_FIRST_EQUAL=$(expr index "${MATCH}" =)
VALUE="${MATCH:${INDEX_OF_FIRST_EQUAL}}"
export "${VALUE_VARNAME}"="${VALUE}"
}
/usr/bin/nitrogen "$@"
if [[ "${1:-}" == "--restore" ]]; then
exit $?
fi
NITROGEN_BG_SAVED_CFG_FILE="${HOME}/.config/nitrogen/bg-saved.cfg"
if [[ ! -f "${NITROGEN_BG_SAVED_CFG_FILE}" ]]; then
printf "!ERROR! Cannot find NITROGEN_BG_SAVED_CFG_FILE[%s]\n" "${NITROGEN_BG_SAVED_CFG_FILE}" 1>&2
exit 1
fi
key_value_retriever "file" "${NITROGEN_BG_SAVED_CFG_FILE}" "NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE"
if [[ -z "${NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE}" ]]; then
printf "!ERROR! Cannot retrieve NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE from NITROGEN_BG_SAVED_CFG_FILE[%s]\n" "NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE" 1>&2
exit 1
fi
if [[ ! -f "${NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE}" ]]; then
printf "!ERROR! Cannot find NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE[%s]\n" "${NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE}" 1>&2
exit 1
fi
printf "Setting nitrogen background into freedesktop.org AccountsService...\n"
printf "NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE[%s]\n" "${NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE}"
dbus-send \
--print-reply \
--system \
--dest=org.freedesktop.Accounts \
/org/freedesktop/Accounts/User$(id -u) \
org.freedesktop.DBus.Properties.Set \
string:org.freedesktop.DisplayManager.AccountsService \
string:BackgroundFile \
variant:string:"${NITROGEN_BG_SAVED_CFG_FIRST_BACKGROUND_FILE}"
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