Assign tags on MacOS using a cronjob

macTag.sh

#!/bin/bash

EXTENSION_TAG_MAPPING="${HOME}/.tag_mapping"
CRONTAG_LOG="/var/log/crontag.log"

function __echo() { echo "$(date +%D:%H:%M.%S) - $@" | tee -a "${CRONTAG_LOG}"; }

which tag &>/dev/null || { __echo "main: missing tag. install it by using 'brew install tag'. Exiting.."; exit 1; }
ls "${EXTENSION_TAG_MAPPING}" &>/dev/null || { __echo "main: missing extension tag mapping file ($EXTENSION_TAG_MAPPING)'. Exiting.."; exit 1; }

function mac_tag()
{
	if [ $# -ne 2 ]; then
		__echo "usage mac_tag <tag> <file_extension>"
		exit 1
	fi

	local tagname=$1
	local extension=$2
	local exit_code=0

	find ~ -name *.${extension} 2>/dev/null | while read file; do
		__echo "${FUNCNAME[0]}: tagging ${file} with ${tagname}"
		tag --add "${tagname}" "${file}" || { __echo "${FUNCNAME[0]}: error tagging ${file} with ${tagname}"; exit_code=1; }
	done

	return ${exit_code}
}
function tag_files()
{
	local exit_code=0

	cat /dev/null > "${CRONTAG_LOG}"
	__echo "${FUNCNAME[0]}: start tagging"
	while read line; do
		tag=$(echo "${line}" | cut -d ":" -f 1)
		extension=$(echo "${line}" | cut -d ":" -f 2)

		[[ "${tag}" == "#"* ]] && continue
		[ -z "${tag}" ] || [ -z "${extension}" ] && { __echo "${FUNCNAME[0]}: tag or/and extension empty"; continue; }

		__echo "${FUNCNAME[0]}: working on tagging .${extension} with tag ${tag}"
		mac_tag "${tag}" "${extension}" || { __echo "${FUNCNAME[0]}: tagging .${extension} with tag ${tag} completed with errors"; exit_code=1; continue; }
		__echo "${FUNCNAME[0]}: tagging .${extension} with tag ${tag} completed"
	done < $EXTENSION_TAG_MAPPING

	__echo "${FUNCNAME[0]}: tagging completed"
	return ${exit_code}
}

tag_files || exit 1