--- /dev/null
+#line 1
+package Module::Install::Substitute;
+
+use strict;
+use warnings;
+use 5.008; # I don't care much about earlier versions
+
+use Module::Install::Base;
+our @ISA = qw(Module::Install::Base);
+
+our $VERSION = '0.03';
+
+require File::Temp;
+require File::Spec;
+require Cwd;
+
+#line 89
+
+sub substitute
+{
+ my $self = shift;
+ $self->{__subst} = shift;
+ $self->{__option} = {};
+ if( UNIVERSAL::isa( $_[0], 'HASH' ) ) {
+ my $opts = shift;
+ while( my ($k,$v) = each( %$opts ) ) {
+ $self->{__option}->{ lc( $k ) } = $v || '';
+ }
+ }
+ $self->_parse_options;
+
+ my @file = @_;
+ foreach my $f (@file) {
+ $self->_rewrite_file( $f );
+ }
+
+ return;
+}
+
+sub _parse_options
+{
+ my $self = shift;
+ my $cwd = Cwd::getcwd();
+ foreach my $t ( qw(from to) ) {
+ $self->{__option}->{$t} = $cwd unless $self->{__option}->{$t};
+ my $d = $self->{__option}->{$t};
+ die "Couldn't read directory '$d'" unless -d $d && -r _;
+ }
+}
+
+sub _rewrite_file
+{
+ my ($self, $file) = @_;
+ my $source = File::Spec->catfile( $self->{__option}{from}, $file );
+ $source .= $self->{__option}{sufix} if $self->{__option}{sufix};
+ unless( -f $source && -r _ ) {
+ print STDERR "Couldn't find file '$source'\n";
+ return;
+ }
+ my $dest = File::Spec->catfile( $self->{__option}{to}, $file );
+ return $self->__rewrite_file( $source, $dest );
+}
+
+sub __rewrite_file
+{
+ my ($self, $source, $dest) = @_;
+
+ my $mode = (stat($source))[2];
+
+ open my $sfh, "<$source" or die "Couldn't open '$source' for read";
+ print "Open input '$source' file for substitution\n";
+
+ my ($tmpfh, $tmpfname) = File::Temp::tempfile('mi-subst-XXXX', UNLINK => 1);
+ $self->__process_streams( $sfh, $tmpfh, ($source eq $dest)? 1: 0 );
+ close $sfh;
+
+ seek $tmpfh, 0, 0 or die "Couldn't seek in tmp file";
+
+ open my $dfh, ">$dest" or die "Couldn't open '$dest' for write";
+ print "Open output '$dest' file for substitution\n";
+
+ while( <$tmpfh> ) {
+ print $dfh $_;
+ }
+ close $dfh;
+ chmod $mode, $dest or "Couldn't change mode on '$dest'";
+}
+
+sub __process_streams
+{
+ my ($self, $in, $out, $replace) = @_;
+
+ my @queue = ();
+ my $subst = $self->{'__subst'};
+ my $re_subst = join('|', map {"\Q$_"} keys %{ $subst } );
+
+ while( my $str = <$in> ) {
+ if( $str =~ /^###\s*(before|replace|after)\:\s?(.*)$/s ) {
+ my ($action, $nstr) = ($1,$2);
+ $nstr =~ s/\@($re_subst)\@/$subst->{$1}/ge;
+
+ die "Replace action is bad idea for situations when dest is equal to source"
+ if $replace && $action eq 'replace';
+ if( $action eq 'before' ) {
+ die "no line before 'before' action" unless @queue;
+ # overwrite prev line;
+ pop @queue;
+ push @queue, $nstr;
+ push @queue, $str;
+ } elsif( $action eq 'replace' ) {
+ push @queue, $nstr;
+ } elsif( $action eq 'after' ) {
+ push @queue, $str;
+ push @queue, $nstr;
+ # skip one line;
+ <$in>;
+ }
+ } else {
+ push @queue, $str;
+ }
+ while( @queue > 3 ) {
+ print $out shift(@queue);
+ }
+ }
+ while( scalar @queue ) {
+ print $out shift(@queue);
+ }
+}
+
+1;
+