#!/bin/bash
set -e

. ./get-settings

find -name '*.IN[O1]' ! -path '*/skeleton/*' -exec perl -e '
	use IO::Handle;
	use POSIX;
	my $f= shift;
	my $d= $f;
	$d =~ s/\.IN([O1])$//;
	my $overwrite= ($1 eq 'O');
	my $g= "$d.new";
	open F, "< $f" or die "$f $!";
	open G, "> $g" or die "$g $!";
	stat F or die "$f $!";
	my $mode= (stat F)[2];
	while (<F>) {
		s/\%(\w+)\%/ 
			exists($ENV{$1}) ? $ENV{$1} : die "$1 undef at $f:$.\n"
		 /ge;
		print G or die $!;
	}
	F->error and die $!;
	close G or die $!;
	if ($mode & 01) {
		chmod 0755, $g or die "$g $!";
	}
	close F or die $!;
	if ($overwrite) {
		rename $g, $d or die "$g $d $!";
	} else {
		if (link $g, $d) {
			unlink $g or die $!;
		} else {
			die "$g $d $!" unless $!==&EEXIST;
		}
	}
' '{}' \;