#!/usr/bin/env bash
# build-aux/lint-generic - Non-language-specific lint checks
#
# Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later

RED=$(tput setaf 1)
RESET=$(tput sgr0)

err() {
	printf "${RED}%s${RESET}: %s\n" "$1" "$2" >&2
	r=1
}

r=0
for filename in "$@"; do
	# File header ##########################################################

	shebang="$(sed -n '1{/^#!/p;}' "$filename")"
	if [[ -x $filename && (-z $shebang || $shebang == '#!/hint/'*) ]]; then
		err "$filename" 'is executable but does not have a shebang'
	elif [[ (-n $shebang && $shebang != '#!/hint/'*) && ! -x $filename ]]; then
		err "$filename" 'has a shebang but is not executable'
	fi
	case "$shebang" in
		'') : ;;
		'#!/bin/sh') : ;;
		'#!/usr/bin/env bash') : ;;
		'#!/usr/bin/env python3') : ;;
		*) err "$filename" 'has an unrecognized shebang' ;;
	esac

	if ! grep -E -q 'Copyright \(C\) 202[4-9]((-|, )202[5-9])*  Luke T. Shumaker' "$filename"; then
		err "$filename" 'is missing a copyright statement'
	fi
	if test -e .git && ! git diff --quiet milestone/2025-01-01 HEAD -- "$filename"; then
		if ! grep -E -q 'Copyright \(C\) .*2025  Luke T. Shumaker' "$filename"; then
			err "$filename" 'has an outdated copyright statement'
		fi
	fi
	if ! grep -q '\sSPDX-License-Identifier[:] ' "$filename"; then
		err "$filename" 'is missing an SPDX-License-Identifier'
	fi

	dscname_act=$(./build-aux/get-dscname "$filename")
	dscname_exp=$(echo "$filename" | sed \
		-e 's,.*/config/,,' \
		-e 's,.*/config\.h$,config.h,' \
		-e 's,.*include/,,' \
		-e 's,.*static/,,' \
		-e 's/\.wip$//')
	if [ "$dscname_act" != "$dscname_exp" ] && [ "cmd/$dscname_act" != "$dscname_exp" ]; then
		err "$filename" "self-identifies as $dscname_act (expected $dscname_exp)"
	fi

	# File body ############################################################

	if grep -n --color=auto "$(printf '\\S\t')" "$filename"; then
		err "$filename" 'uses tabs for alignment'
	fi
done
exit $r