i3blocks-refresh-mk

#!/usr/bin/env bash
# searches for the name of the block in the i3blocks config file and
# refreshes it by sending the corresponding signal
#
# this parses and caches the i3blocks config file once an hour
# runs about twice as fast as i3blocks-refresh

BLOCK_NAME="${1:?Provide block name to refresh as first argument}"

I3BLOCKS_CONFIG_FILE="${HOME}/.config/i3blocks/config"
SIGNAL_CACHE="${HOME}/.cache/i3blocks_signals"

# use 'make' to cache signals based on i3blocks config modification time
cache() {
	cd "${SIGNAL_CACHE}" || {
		mkdir -p "${SIGNAL_CACHE}"
		cd "${SIGNAL_CACHE}" || exit 1
	}

	cp "${I3BLOCKS_CONFIG_FILE}" "${SIGNAL_CACHE}/config"
	if [[ ! -e "${SIGNAL_CACHE}/Makefile" ]]; then
		echo 'cache: config
		i3blocks-parse-signals >./cache
	' >"${SIGNAL_CACHE}/Makefile"
	fi
	make >/dev/null
}

BLOCK_SIGNAL="$(grep -m1 "${BLOCK_NAME} " <"${SIGNAL_CACHE}/cache" | cut -d' ' -f2)"

if [[ -n "${BLOCK_SIGNAL}" ]]; then
	pkill -RTMIN+"$BLOCK_SIGNAL" i3blocks
	echo "Refreshed ${BLOCK_NAME}... (${BLOCK_SIGNAL})"
else
	printf 'Could not find block %s\n' "${BLOCK_NAME}"
	# in case this is being run the first time, cache
	cache
	exit 1
fi

# cache the results once every hour
evry 1h -i3blocks-cache && cache
exit 0