#!/usr/bin/env bash
set -e

# Draws the Django template inheritance graph.

cd "$(dirname "$0")"/../templates

(
    echo 'digraph {'
    find . -name '*.html' -printf '%P\n' | while read -r t; do
        echo "\"$t\";" | sed 's|/|\\n|g'
        perl -lne 'print "\"'"$t"'\" -> \"$1\";" if m/{%\s*extends\s*"([^"]+)"/' "$t" \
            | sed 's|/|\\n|g'
    done
    echo '}'
) > graph.dot

dot -Tsvg graph.dot > graph.svg
rm graph.dot
echo file://"$(pwd)"/graph.svg