tools/find-double-newline.sh

#!/bin/sh
# SPDX-License-Identifier: LGPL-2.1-or-later

set -eu

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

case "${1:-}" in
    recdiff)
        if [ "${2:-}" = "" ] ; then
            DIR="$TOP"
        else
            DIR="$2"
        fi

        find "$DIR" -type f \( -name '*.[ch]' -o -name '*.xml' \) -exec "$0" diff \{\} \;
        ;;

    recpatch)
        if [ "${2:-}" = "" ] ; then
            DIR="$TOP"
        else
            DIR="$2"
        fi

        find "$DIR" -type f \( -name '*.[ch]' -o -name '*.xml' \) -exec "$0" patch \{\} \;
        ;;

    diff)
        T="$(mktemp)"
        sed '/^$/N;/^\n$/D' <"${2:?}" >"$T"
        diff -u "$2" "$T"
        rm -f "$T"
        ;;

    patch)
        sed -i '/^$/N;/^\n$/D' "${2:?}"
        ;;

    *)
        echo "Expected recdiff|recpatch|diff|patch as verb." >&2
        ;;
esac