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package Shell; |
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use 5.005_64; |
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use strict; |
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use warnings; |
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our($capture_stderr, $VERSION, $AUTOLOAD); |
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|
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$VERSION = '0.4'; |
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|
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sub new { bless \$VERSION, shift } # Nothing better to bless |
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sub DESTROY { } |
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|
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sub get_coderef { |
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my $codepack = shift; |
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my $method = shift; |
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$codepack || return '[error]'; |
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$method ||= ''; |
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$method && ($codepack .= '::'); |
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return eval '\&' . $codepack . $method . ';'; |
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} |
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|
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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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} else { |
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@EXPORT = 'AUTOLOAD'; |
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} |
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foreach my $sym (@EXPORT) { |
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no strict 'refs'; |
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*{"${callpack}::$sym"} = get_coderef($self, $sym); |
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} |
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} |
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|
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sub AUTOLOAD { |
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shift if ref $_[0] && $_[0]->isa( 'Shell' ); |
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my $cmd = $AUTOLOAD; |
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$cmd =~ s/^.*:://; |
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eval <<"*END*"; |
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sub $AUTOLOAD { |
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if (\@_ < 1) { |
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\$Shell::capture_stderr ? `$cmd 2>&1` : `$cmd`; |
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} elsif ('$^O' eq 'os2') { |
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local(\*SAVEOUT, \*READ, \*WRITE); |
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|
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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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|
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my \$pid = system(1, '$cmd', \@_); |
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die "Can't execute $cmd: \$!\\n" if \$pid < 0; |
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|
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open STDOUT, '>&SAVEOUT' or die; |
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close SAVEOUT; |
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|
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if (wantarray) { |
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my \@ret = <READ>; |
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close READ; |
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waitpid \$pid, 0; |
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\@ret; |
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} else { |
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local(\$/) = undef; |
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my \$ret = <READ>; |
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close READ; |
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waitpid \$pid, 0; |
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\$ret; |
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} |
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} else { |
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my \$a; |
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my \@arr = \@_; |
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if ('$^O' eq 'MSWin32') { |
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# XXX this special-casing should not be needed |
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# if we do quoting right on Windows. :-( |
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# |
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# First, escape all quotes. Cover the case where we |
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# want to pass along a quote preceded by a backslash |
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# (i.e., C<"param \\""" end">). |
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# Ugly, yup? You know, windoze. |
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# Enclose in quotes only the parameters that need it: |
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# try this: c:\> dir "/w" |
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# and this: c:\> dir /w |
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for (\@arr) { |
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s/"/\\\\"/g; |
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s/\\\\\\\\"/\\\\\\\\"""/g; |
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\$_ = qq["\$_"] if /\\s/; |
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} |
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} else { |
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for (\@arr) { |
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s/(['\\\\])/\\\\\$1/g; |
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\$_ = \$_; |
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} |
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} |
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push \@arr, '2>&1' if \$Shell::capture_stderr; |
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open(SUBPROC, join(' ', '$cmd', \@arr, '|')) |
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or die "Can't exec $cmd: \$!\\n"; |
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if (wantarray) { |
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my \@ret = <SUBPROC>; |
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close SUBPROC; # XXX Oughta use a destructor. |
| 101 |
\@ret; |
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} else { |
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local(\$/) = undef; |
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my \$ret = <SUBPROC>; |
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close SUBPROC; |
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\$ret; |
| 107 |
} |
| 108 |
} |
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} |
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*END* |
| 111 |
|
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die "$@\n" if $@; |
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goto &$AUTOLOAD; |
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} |
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|
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1; |
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|
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__END__ |
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|
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=head1 NAME |
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|
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Shell - run shell commands transparently within perl |
| 123 |
|
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=head1 SYNOPSIS |
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|
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See below. |
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|
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=head1 DESCRIPTION |
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|
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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 |
| 133 |
From: Larry Wall <lwall@scalpel.netlabs.com> |
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Subject: a new module I just wrote |
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|
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Here's one that'll whack your mind a little out. |
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|
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#!/usr/bin/perl |
| 139 |
|
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use Shell; |
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|
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$foo = echo("howdy", "<funny>", "world"); |
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print $foo; |
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|
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$passwd = cat("</etc/passwd"); |
| 146 |
print $passwd; |
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|
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sub ps; |
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print ps -ww; |
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|
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cp("/etc/passwd", "/tmp/passwd"); |
| 152 |
|
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That's maybe too gonzo. It actually exports an AUTOLOAD to the current |
| 154 |
package (and uncovered a bug in Beta 3, by the way). Maybe the usual |
| 155 |
usage should be |
| 156 |
|
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use Shell qw(echo cat ps cp); |
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|
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Larry |
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|
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|
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If you set $Shell::capture_stderr to 1, the module will attempt to |
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capture the STDERR of the process as well. |
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|
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The module now should work on Win32. |
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|
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Jenda |
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|
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There seemed to be a problem where all arguments to a shell command were |
| 170 |
quoted before being executed. As in the following example: |
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|
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cat('</etc/passwd'); |
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ls('*.pl'); |
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|
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really turned into: |
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|
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cat '</etc/passwd' |
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ls '*.pl' |
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|
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instead of: |
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|
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cat </etc/passwd |
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ls *.pl |
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|
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and of course, this is wrong. |
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|
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I have fixed this bug, it was brought up by Wolfgang Laun [ID 20000326.008] |
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|
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Casey |
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|
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=head2 OBJECT ORIENTED SYNTAX |
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|
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Shell now has an OO interface. Good for namespace conservation |
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and shell representation. |
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|
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use Shell; |
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my $sh = Shell->new; |
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print $sh->ls; |
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|
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Casey |
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|
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=head1 AUTHOR |
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|
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Larry Wall |
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|
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Changes by Jenda@Krynicky.cz and Dave Cottle <d.cottle@csc.canterbury.ac.nz> |
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|
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Changes and bug fixes by Casey Tweten <crt@kiski.net> |
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|
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=cut |
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