#!/bin/bash

set -eu -o pipefail

arg="${1:-}"
if [[ $arg =~ ^-(h|-help)$ ]]; then
    echo "usage: $0 [<FROM-VERSION>]"
    echo ""
    echo "Filter out irrelevant entries (sponsors, chore, docs) from the upstream changelog."
    exit 0
fi

repo="$(git rev-parse --show-toplevel)"

cfn="$repo/changes.new.tmp"

cp "$repo/eslint/CHANGELOG.md" "$cfn"

sed -ri 's/^\* \S+ /+ /g' "$cfn"

FILTER_LINES="\
  / Sponsors: /Id; \
  / Chore: /Id; \
  / Docs: /Id; \
  / ci: /Id; \
  / build: /Id; \
  /ESLint Jenkins/Id; \
"

sed -i "$FILTER_LINES" "$cfn"

if [[ $arg ]]; then
   version="$arg"
   sed -i "/^$version -/Q" "$cfn"
   sed -i '/^\+ /!d' "$cfn"
fi

# drop PR authors
sed -Ei 's/ \([^)]+\)$//g' "$cfn"

mv "$cfn" "$repo/changes"

echo "trimmed changes available at '$repo/changes'"