killshit.sh

#!/bin/bash - 

set -x
while IFS=":" read -r filename match;
do
    echo $match
    tag_name=$(echo ${match} | sed -n "s/^.*{% import \([a-zA-Z0-9_]*\) %}.*$/\1/p")
    sed -i "s~${tag_name}\.~~g" ${filename}
    sed -i 's~{% import \([a-zA-Z0-9_]*\) %}~{% load \1 %}~g' ${filename}
done < <(grep -r '{% import' * | grep -v docs | grep -v killshit)