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package File::Which; |
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use 5.004; |
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use strict; |
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use Exporter (); |
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use File::Spec (); |
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use vars qw{$VERSION @ISA @EXPORT @EXPORT_OK}; |
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BEGIN { |
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$VERSION = '1.09'; |
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@ISA = 'Exporter'; |
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@EXPORT = 'which'; |
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@EXPORT_OK = 'where'; |
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} |
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use constant IS_VMS => ($^O eq 'VMS'); |
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use constant IS_MAC => ($^O eq 'MacOS'); |
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1018
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use constant IS_DOS => ($^O eq 'MSWin32' or $^O eq 'dos' or $^O eq 'os2'); |
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# For Win32 systems, stores the extensions used for |
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# executable files |
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# For others, the empty string is used |
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# because 'perl' . '' eq 'perl' => easier |
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my @PATHEXT = (''); |
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if ( IS_DOS ) { |
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# WinNT. PATHEXT might be set on Cygwin, but not used. |
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if ( $ENV{PATHEXT} ) { |
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push @PATHEXT, split ';', $ENV{PATHEXT}; |
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} else { |
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# Win9X or other: doesn't have PATHEXT, so needs hardcoded. |
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push @PATHEXT, qw{.com .exe .bat}; |
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} |
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} elsif ( IS_VMS ) { |
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push @PATHEXT, qw{.exe .com}; |
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} |
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sub which { |
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my ($exec) = @_; |
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return undef unless $exec; |
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my $all = wantarray; |
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my @results = (); |
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# check for aliases first |
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if ( IS_VMS ) { |
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my $symbol = `SHOW SYMBOL $exec`; |
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chomp($symbol); |
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unless ( $? ) { |
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return $symbol unless $all; |
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push @results, $symbol; |
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} |
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} |
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if ( IS_MAC ) { |
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my @aliases = split /\,/, $ENV{Aliases}; |
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foreach my $alias ( @aliases ) { |
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# This has not been tested!! |
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# PPT which says MPW-Perl cannot resolve `Alias $alias`, |
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# let's just hope it's fixed |
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if ( lc($alias) eq lc($exec) ) { |
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chomp(my $file = `Alias $alias`); |
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last unless $file; # if it failed, just go on the normal way |
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return $file unless $all; |
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push @results, $file; |
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# we can stop this loop as if it finds more aliases matching, |
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# it'll just be the same result anyway |
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last; |
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} |
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} |
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} |
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my @path = File::Spec->path; |
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if ( IS_DOS or IS_VMS or IS_MAC ) { |
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unshift @path, File::Spec->curdir; |
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} |
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foreach my $base ( map { File::Spec->catfile($_, $exec) } @path ) { |
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for my $ext ( @PATHEXT ) { |
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my $file = $base.$ext; |
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# We don't want dirs (as they are -x) |
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next if -d $file; |
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if ( |
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# Executable, normal case |
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-x _ |
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or ( |
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# MacOS doesn't mark as executable so we check -e |
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IS_MAC |
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|| |
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( |
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IS_DOS |
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and |
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grep { |
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$file =~ /$_\z/i |
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} @PATHEXT[1..$#PATHEXT] |
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) |
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# DOSish systems don't pass -x on |
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# non-exe/bat/com files. so we check -e. |
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# However, we don't want to pass -e on files |
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# that aren't in PATHEXT, like README. |
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and -e _ |
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) |
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) { |
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return $file unless $all; |
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push @results, $file; |
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} |
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} |
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} |
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if ( $all ) { |
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return @results; |
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} else { |
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return undef; |
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} |
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} |
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sub where { |
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# force wantarray |
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my @res = which($_[0]); |
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return @res; |
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} |
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1; |
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__END__ |