127 lines
2.3 KiB
Perl
127 lines
2.3 KiB
Perl
package Shell;
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use Config;
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sub import {
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my $self = shift;
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my ($callpack, $callfile, $callline) = caller;
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my @EXPORT;
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if (@_) {
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@EXPORT = @_;
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}
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else {
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@EXPORT = 'AUTOLOAD';
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}
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foreach $sym (@EXPORT) {
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*{"${callpack}::$sym"} = \&{"Shell::$sym"};
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}
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};
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AUTOLOAD {
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my $cmd = $AUTOLOAD;
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$cmd =~ s/^.*:://;
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eval qq {
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*$AUTOLOAD = sub {
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if (\@_ < 1) {
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`$cmd`;
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}
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elsif (\$Config{'archname'} eq 'os2') {
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local(\*SAVEOUT, \*READ, \*WRITE);
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open SAVEOUT, '>&STDOUT' or die;
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pipe READ, WRITE or die;
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open STDOUT, '>&WRITE' or die;
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close WRITE;
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my \$pid = system(1, \$cmd, \@_);
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die "Can't execute $cmd: \$!\n" if \$pid < 0;
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open STDOUT, '>&SAVEOUT' or die;
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close SAVEOUT;
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if (wantarray) {
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my \@ret = <READ>;
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close READ;
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waitpid \$pid, 0;
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\@ret;
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}
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else {
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local(\$/) = undef;
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my \$ret = <READ>;
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close READ;
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waitpid \$pid, 0;
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\$ret;
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}
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}
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else {
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open(SUBPROC, "-|")
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or exec '$cmd', \@_
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or die "Can't exec $cmd: \$!\n";
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if (wantarray) {
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my \@ret = <SUBPROC>;
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close SUBPROC; # XXX Oughta use a destructor.
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\@ret;
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}
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else {
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local(\$/) = undef;
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my \$ret = <SUBPROC>;
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close SUBPROC;
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\$ret;
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}
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}
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}
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};
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goto &$AUTOLOAD;
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}
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1;
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__END__
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=head1 NAME
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Shell - run shell commands transparently within perl
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=head1 SYNOPSIS
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See below.
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=head1 DESCRIPTION
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Date: Thu, 22 Sep 94 16:18:16 -0700
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Message-Id: <9409222318.AA17072@scalpel.netlabs.com>
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To: perl5-porters@isu.edu
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From: Larry Wall <lwall@scalpel.netlabs.com>
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Subject: a new module I just wrote
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Here's one that'll whack your mind a little out.
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#!/usr/bin/perl
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use Shell;
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$foo = echo("howdy", "<funny>", "world");
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print $foo;
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$passwd = cat("</etc/passwd");
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print $passwd;
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sub ps;
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print ps -ww;
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cp("/etc/passwd", "/tmp/passwd");
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That's maybe too gonzo. It actually exports an AUTOLOAD to the current
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package (and uncovered a bug in Beta 3, by the way). Maybe the usual
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usage should be
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use Shell qw(echo cat ps cp);
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Larry
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=head1 AUTHOR
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Larry Wall
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=cut
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