#!/usr/bin/env bash

set -e

exit_code=0
tag_regex='[gb]\?:\?\(ale\|ALE\)[a-zA-Z_\-]\+'

tags="$(mktemp -t tags.XXXXXXXX)"
refs="$(mktemp -t refs.XXXXXXXX)"
result="$(mktemp -t refs.XXXXXXXX)"
# Grep for tags and references, and complain if we find a reference without
# a tag for the reference. Only our tags will be included.
grep --exclude=tags -roh "\\*$tag_regex\\*" doc | sed 's/*//g' | sort -u > "$tags"
grep --exclude=tags -roh "|$tag_regex|" doc | sed 's/|//g' | sort -u > "$refs"

# Collect tags in a file we can display to the user if there are differences.
comm -23 "$refs" "$tags" > "$result"

exit_code=0

# If there are differences, show them and error out.
if ! [[ $(wc -l < "$result") -eq 0 ]]; then
    cat "$result"
    exit_code=1
fi

rm "$tags"
rm "$refs"
rm "$result"
exit $exit_code