#!/bin/bash

set -eu

srcdir=$(dirname "$(readlink -f "$0")")
test -z "$srcdir" && srcdir=.

CLANG_FORMAT=${CLANG_FORMAT:-clang-format}
options=()
files=()
lines=()
no_options=0;inplace=0;xml=0;keep_offset=0;keep_length=0;keep=0;
filename=tmp.1.c
offsets=
karg=
off_opts=()
for arg in "$@"; do
    if [[ $keep = 1 ]]; then
	if [[ "$karg" = "-offset" ]]; then
	    offsets="$offsets${offsets:+ }$arg"
	    off_opts+=("$karg" "$arg")
	elif [[ "$karg" = "-length" ]]; then
	    offsets="$offsets:$arg"
	    off_opts+=("$karg" "$arg")
	elif [[ "$karg" = "-assume-filename" ]]; then
	    filename="$arg"
	    options+=("$karg" "$arg")
	else
	    options+=("$karg" "$arg")
	fi
	keep=0
    elif [[ $no_options = 0 ]]; then
	case "$arg" in
	    -assume-filename=*)
		filename="${arg#-assume-filename=}"
		;;
	    -lines=*)
		lines+=("${arg#-lines=}")
		;;
	    *)
		;;
	esac
	case "$arg" in
	    --) no_options=1
		;;
	    -i) inplace=1
		;;
	    -output-replacements-xml)
		xml=1
		;;
	    -offset|-length|-cursor|-assume-filename|-fallback-style|-style)
		keep=1
		karg="$arg"
		;;
	    -*) options+=("$arg")
		;;
	    *) files+=("$arg")
	       ;;
	esac
    else
	files+=("$arg")
    fi
done

export IN_LINES="${lines[*]}"
export OFFSETS="$offsets"

options_o=("${options[@]}")
if [[ $inplace = 1 ]]; then
    options_o=("-i" "${options[@]}")
fi
if [[ $xml = 1 ]]; then
    options_o=("-output-replacements-xml" "${options[@]}")
fi
options_o+=("${off_opts[@]}")

do_xs() {
    perl "$srcdir"/format-xs-1.pl "$1" > "$1".1.c
    $CLANG_FORMAT -i "${options[@]}" -- "$1".1.c
    if [[ $xml = 1 ]]; then
	perl "$srcdir"/format-xs-2.pl "$1".1.c > "$1".1.xs
	perl "$srcdir"/format-xs-xml.pl <(diff -U0 <(od -An -tu1 -w1 -v "$1") <(od -An -tu1 -w1 -v "$1".1.xs))
	rm "$1".1.xs
    elif [[ $inplace = 1 ]]; then
	perl "$srcdir"/format-xs-2.pl "$1".1.c > "$1"
    else
	perl "$srcdir"/format-xs-2.pl "$1".1.c
    fi
    rm "$1".1.c
}

if [[ ${#files[@]} -eq 0 ]]; then
    case "$filename" in
	    *.xs)
		cat > "$filename".1.xs
		do_xs "$filename".1.xs
		rm "$filename".1.xs
		;;
	    *)
		$CLANG_FORMAT "${options_o[@]}"
		;;
    esac
else
    for file in "${files[@]}"; do
	case "$file" in
	    *.xs)
		do_xs "$file"
		;;
	    *)
		$CLANG_FORMAT "${options_o[@]}" -- "$file"
		;;
	esac
    done
fi