#!/bin/sh

# SPDX-FileCopyrightText: 2024 Jonas Smedegaard <dr@jones.dk
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
# generate markdown-formatted word-based delta between two markdown files

set -eu

#dwdiff -A best -R -d ',.?:;[]()-_/' -W ' \t\n#' -w '<span style="color: red"><del>' -x '</del></span>' -y '<span style="color: green"><ins>' -z '</ins></span>' "$1" "$2"

# annotate changes with both span and del/ins html tags
#  * only del/ins confuses markdown parsers around unnumbered lists
# inspiration: https://stackoverflow.com/a/2384393/18619283
set - --start-insert='<span style="color: green"><ins>' --stop-insert='</ins></span>' "$@"
set - --start-delete='<span style="color: red"><del>' --stop-delete='</del></span>' "$@"

#  treat # as whitespace and other punctuation as delimiters
set - --white-space=' \t\n#' --delimiters=',.?:;[]()-_/' "$@"

# compact difference detection and representation
set - --algorithm=best --repeat-markers "$@"

#echo dwdiff "$@"
exec dwdiff "$@"