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Filename : chconfig
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#! /usr/bin/perl -w

# chconfig
# Copyright (C) 1999 Fabrizio Polacco <fpolacco@prosa.it>
#
# 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
#
# tool to convert the man-db configuration file to the FHS.
# it slurps the file in argument (default /etc/manpath.config) and,
# unless exists in it a single line containing the keyword
#		NOFHS
# it tries to make the changes to comply with FHS.

push @ARGV, "/etc/manpath.config" unless @ARGV;
	print "  Upgrading $ARGV[0]\n";

my $myum = 0;
my $myusm = 0;
my $mh = 0;
my $mhug = 0;
my $mhob = 0;
my $mhos = 0;
my $mbusm = 0;
my $mbom = 0;

push @IN, "  # config file rewritten by tool chconfig\n";
while (<>) {
	warn "  Respecting NOFHS directive.\n" and exit 0
		if m,^\s*NOFHS\s*$,i;
	warn "  Configuration file already processed.\n" and exit 0
		if m/$IN[0]/;
	push @IN, $_;
	  # first section
	$myum = $#IN	if m,^MANDATORY_MANPATH\s+/usr/man\s*$, ;
	$myusm = $#IN	if m,^MANDATORY_MANPATH\s+/usr/share/man\s*$, ;
	  # second section
	$mhug = $#IN	if m,^MANPATH_MAP\s+/usr/games\s+, ;
	$mhob = $#IN	if m,^MANPATH_MAP\s+/opt/bin\s+, ;
	$mhos = $#IN	if m,^MANPATH_MAP\s+/opt/sbin\s+, ;
	$mh = $#IN	if m,^MANPATH_MAP\s+, ;
	  # third section
	if ( m,^MANDB_MAP\s+(/\S+)(?:\s+.*)?$, ) {
		$w = $1 ;
		push @IN3, ( $w =~ s,/,,g) . " $_";
		$mbusm = $#IN	if m,^MANDB_MAP\s+/usr/share/man(?:\s+.*)?$, ;
		$mbom = $#IN	if m,^MANDB_MAP\s+/opt/man(?:\s+.*)?$, ;
	}
}
  # In the third section, if needed, add the lines
  #	MANDB_MAP       /usr/share/man		/var/cache/man/share
  #	MANDB_MAP	/opt/man		/var/cache/man/opt
push @IN3, "3 MANDB_MAP\t/usr/share/man\t/var/cache/man/share\n"	unless $mbusm;
push @IN3, "2 MANDB_MAP\t/opt/man\t/var/cache/man/opt\n"		unless $mbom;

$saved = $ARGV . ".orig";
rename $ARGV, ( -e $saved ? $ARGV . "~" : $saved );
open OUT, ">$ARGV" or die "Cannot open output file $ARGV: $!\n";

foreach $j (0..$#IN) {
	$_ = $IN[$j];
	  # first section
	  # MANDATORY_MANPATH section:
	  # we have to add 
	  #	MANDATORY_MANPATH                       /usr/share/man
	  # just after the usual line
	  #	MANDATORY_MANPATH                       /usr/man
	  # which we leave in place.
	if ( ! $myusm and $j == $myum ) {
		print OUT ;
		print OUT "MANDATORY_MANPATH\t\t\t/usr/share/man\n";
		next;
	}
	  # second section
	  # MANPATH_MAP section:
	  # we change all the manpath_elements from /usr/man to /usr/share/man.
	  # we also add the lines
	  #	MANPATH_MAP	/usr/games		/usr/share/man
	  #	MANPATH_MAP	/opt/bin		/opt/man
	  #	MANPATH_MAP	/opt/sbin		/opt/man
	  # if they were missing.
	if ( m,^MANPATH_MAP\s+, ) {
		s,(\s+)/usr/man\s*$,$1/usr/share/man\n,;
		print OUT ;
		  # only after the last entry of the section!
		if ( $j == $mh ) {
			print OUT "MANPATH_MAP\t/usr/games\t\t/usr/share/man\n"
				unless $mhug;
			print OUT "MANPATH_MAP\t/opt/bin\t\t/opt/man\n"
				unless $mhob;
			print OUT "MANPATH_MAP\t/opt/sbin\t\t/opt/man\n"
				unless $mhos;
		}
		next;
	}
	  # third section
	  # MANDB_MAP section:
	  # in the relative_catpath field, we change all occurrences of
	  # /var/catman with /var/cache/man.
	  # we also reorder the entries to have longer manpath before.
	if ( m,^MANDB_MAP\s+, ) {
		if ( @IN3 ) {
			foreach (reverse sort @IN3) {
				($w,$t,$m,$c) = split;
				$c = "/var/cache/man/$c"
					if !$c or $c =~ m/^FSSTND$/i;
				$c =~ s,/var/catman,/var/cache/man,;
				print OUT $t, "\t", $m, "\t\t", $c, "\n";
			}
			@IN3 = ();
		}
		next;
	}
	  # default
	print OUT;
}

__END__