#!/bin/bash
# SPDX-License-Identifier: BSD-3-Clause
# Copyright 2019, Intel Corporation

# check-manpage -- a tool to check a single man page against errors
#
# While it can handle multiple files, it's recommended to use
# check-manpages instead.
set -e

check_link()
{
	[ $(wc -l <"$file") = 1 ] ||
		{ echo ".so link isn't the only line" && return; }
	link=$(cat "$file")
	link=${link#.so }
	[ "${link##*/}" = "$link" ] ||
		grep -q '^\.so man\([0-9]\)/[a-z0-9+_-]\+\.\1$' "$file" ||
		{ echo ".so link directory is not matching manX" && return; }
	[ -e "${link##*/}" ] ||
		{ echo ".so link target doesn't exist: ${link##*/}" && return; }
}

for m in "$@"; do
	dir="$(dirname $m)"
	file="$(basename $m)"
	[ -n "$dir" ] && pushd "$dir" >/dev/null

	if grep -q '^\.so' "$file"; then
		err=$(check_link)
		[ -z "$err" ] || {
			echo >&2 "$file: $err"
			FAILED=1
		}
		popd >/dev/null 2>/dev/null
		continue
	fi

	# man can emit warnings and errors.  Even non-fatal errors are normally
	# suppressed if a pager is in use (ie, all interactive usage).  Common
	# messages include an unknown macro, an unbreakable line, etc.
	err=$(MANWIDTH=80 man --warnings -E UTF-8 -l -Tutf8 -Z "$file" 2>&1 >/dev/null|
		grep -v 'cannot adjust line' || true)
	[ -z "$err" ] || {
		echo >&2 "$file: $err"
		FAILED=1
	}

	# If a "NAME" section exists, call lexgrog to see if it's properly
	# formatted.
	if grep -q '^\.SH NAME' "$file"; then
		if ! lexgrog "$file" >/dev/null; then
			# lexgrog doesn't give any interesting messages.
			echo 2>&1 "lexgrog failed on $file"
			FAILED=1
		fi
	fi

	popd >/dev/null 2>/dev/null
done

exit $FAILED