#! /bin/sh

# Copyright (C) 1995 Graeme W. Wilford. (Wilf.)
#
# This file is part of man-db.
#
# man-db is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# man-db is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with man-db; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

# script to weed out duplicated manual pages across hierarchies.
#
# Use argument to pass manpaths to the utils, else the system manpath
# is used.
#
# e.g. invoke as `check /usr/man:/usr/local/man'

if test $# -ne 0
then
	manpath=$1
else
	manpath=$(manpath -q)
fi

echo "Search for duplicates under:" >&2
echo "$manpath" >&2

dups=$(whatis -w -M "$manpath" "*" |
       sed -e 's/\([^(]*\) (\([^)]*\)).*/\2#\1/' | \
       sort | uniq -d)

for i in $dups
do

# split up the dup into the section/name components

	args=$(echo "$i" | tr '#' ' ')

# We only cater for two dups. Others will have to be fixed on a later run.
# Find the locations of the dup'd files

	file1=
	file2=

	# shellcheck disable=SC2086
	for file in $(man -aw -M "$manpath" $args |sed -e 's/\([^ ]*\).*/\1/')
	do
		if test "$file1"
		then
			file2=$file
			break
		else
			file1=$file
		fi
	done

# See which is newer and echo

	if test "$(find "$file1" -newer "$file2")"
	then
		echo "$file1 is newer than $file2" >&2
		echo "$file2"
	elif test "$(find "$file2" -newer "$file1")"
	then
		echo "$file2 is newer than $file1" >&2
		echo "$file1"
	fi
done
