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Perl Script | 1996-04-06 | 10.0 KB | 395 lines | [TEXT/MPS ] |
- #!/usr/local/bin/perl
-
- use Config;
- use File::Basename qw(&basename &dirname);
-
- # List explicitly here the variables you want Configure to
- # generate. Metaconfig only looks for shell variables, so you
- # have to mention them as if they were shell variables, not
- # %Config entries. Thus you write
- # $startperl
- # to ensure Configure will look for $Config{startperl}.
-
- # This forces PL files to create target in same directory as PL file.
- # This is so that make depend always knows where to find PL derivatives.
- chdir(dirname($0));
- ($file = basename($0)) =~ s/\.PL$//;
- $file =~ s/\.pl$//
- if ($^O eq 'VMS' or $^O eq 'os2'); # "case-forgiving"
-
- open OUT,">$file" or die "Can't create $file: $!";
-
- print "Extracting $file (with variable substitutions)\n";
-
- # In this section, perl variables will be expanded during extraction.
- # You can use $Config{...} to use Configure variables.
-
- print OUT <<"!GROK!THIS!";
- $Config{'startperl'}
- eval 'exec perl -S \$0 "\$@"'
- if 0;
- !GROK!THIS!
-
- # In the following, perl variables are not expanded during extraction.
-
- print OUT <<'!NO!SUBS!';
- eval 'exec perl -S $0 "$@"'
- if 0;
-
- #
- # Perldoc revision #1 -- look up a piece of documentation in .pod format that
- # is embedded in the perl installation tree.
- #
- # This is not to be confused with Tom Christianson's perlman, which is a
- # man replacement, written in perl. This perldoc is strictly for reading
- # the perl manuals, though it too is written in perl.
-
- if(@ARGV<1) {
- die <<EOF;
- Usage: $0 [-h] [-v] [-t] [-u] [-m] PageName|ModuleName|ProgramName
-
- We suggest you use "perldoc perldoc" to get aquainted
- with the system.
- EOF
- }
-
- use Getopt::Std;
- $Is_VMS = $^O eq 'VMS';
-
- sub usage{
- warn "@_\n" if @_;
- die <<EOF;
- perldoc [-h] [-v] [-u] PageName|ModuleName|ProgramName...
- -h Display this help message.
- -t Display pod using pod2text instead of pod2man and nroff.
- -u Display unformatted pod text
- -m Display modules file in its entirety
- -v Verbosely describe what's going on.
- PageName|ModuleName...
- is the name of a piece of documentation that you want to look at. You
- may either give a descriptive name of the page (as in the case of
- `perlfunc') the name of a module, either like `Term::Info',
- `Term/Info', the partial name of a module, like `info', or
- `makemaker', or the name of a program, like `perldoc'.
-
- Any switches in the PERLDOC environment variable will be used before the
- command line arguments.
-
- EOF
- }
-
- use Text::ParseWords;
-
-
- unshift(@ARGV,shellwords($ENV{"PERLDOC"}));
-
- getopts("mhtuv") || usage;
-
- usage if $opt_h || $opt_h; # avoid -w warning
-
- usage("only one of -t, -u, or -m") if $opt_t + $opt_u + $opt_m > 1;
-
- if ($opt_t) { require Pod::Text; import Pod::Text; }
-
- @pages = @ARGV;
-
- sub containspod {
- my($file) = @_;
- local($_);
- open(TEST,"<$file");
- while(<TEST>) {
- if(/^=head/) {
- close(TEST);
- return 1;
- }
- }
- close(TEST);
- return 0;
- }
-
- sub minus_f_nocase {
- my($file) = @_;
- local *DIR;
- local($")="/";
- my(@p,$p,$cip);
- foreach $p (split(/\//, $file)){
- if ($Is_VMS and not scalar @p) {
- # VMS filesystems don't begin at '/'
- push(@p,$p);
- next;
- }
- if (-d ("@p/$p")){
- push @p, $p;
- } elsif (-f ("@p/$p")) {
- return "@p/$p";
- } else {
- my $found=0;
- my $lcp = lc $p;
- opendir DIR, "@p";
- while ($cip=readdir(DIR)) {
- $cip =~ s/\.dir$// if $Is_VMS;
- if (lc $cip eq $lcp){
- $found++;
- last;
- }
- }
- closedir DIR;
- return "" unless $found;
- push @p, $cip;
- return "@p" if -f "@p";
- }
- }
- return; # is not a file
- }
-
- sub searchfor {
- my($recurse,$s,@dirs) = @_;
- $s =~ s!::!/!g;
- $s = VMS::Filespec::unixify($s) if $Is_VMS;
- printf STDERR "looking for $s in @dirs\n" if $opt_v;
- my $ret;
- my $i;
- my $dir;
- for ($i=0;$i<@dirs;$i++) {
- $dir = $dirs[$i];
- ($dir = VMS::Filespec::unixpath($dir)) =~ s!/$!! if $Is_VMS;
- if (( $ret = minus_f_nocase "$dir/$s.pod")
- or ( $ret = minus_f_nocase "$dir/$s.pm" and containspod($ret))
- or ( $ret = minus_f_nocase "$dir/$s" and containspod($ret))
- or ( $Is_VMS and
- $ret = minus_f_nocase "$dir/$s.com" and containspod($ret))
- or ( $ret = minus_f_nocase "$dir/pod/$s.pod")
- or ( $ret = minus_f_nocase "$dir/pod/$s" and containspod($ret)))
- { return $ret; }
-
- if($recurse) {
- opendir(D,$dir);
- my(@newdirs) = grep(-d,map("$dir/$_",grep(!/^\.\.?$/,readdir(D))));
- closedir(D);
- @newdirs = map((s/.dir$//,$_)[1],@newdirs) if $Is_VMS;
- next unless @newdirs;
- print STDERR "Also looking in @newdirs\n" if $opt_v;
- push(@dirs,@newdirs);
- }
- }
- return ();
- }
-
-
- foreach (@pages) {
- print STDERR "Searching for $_\n" if $opt_v;
- # We must look both in @INC for library modules and in PATH
- # for executables, like h2xs or perldoc itself.
- @searchdirs = @INC;
- unless ($opt_m) {
- if ($Is_VMS) {
- my($i,$trn);
- for ($i = 0; $trn = $ENV{'DCL$PATH'.$i}; $i++) {
- push(@searchdirs,$trn);
- }
- } else {
- push(@searchdirs, grep(-d, split(':', $ENV{'PATH'})));
- }
- @files= searchfor(0,$_,@searchdirs);
- }
- if( @files ) {
- print STDERR "Found as @files\n" if $opt_v;
- } else {
- # no match, try recursive search
-
- @searchdirs = grep(!/^\.$/,@INC);
-
-
- @files= searchfor(1,$_,@searchdirs);
- if( @files ) {
- print STDERR "Loosely found as @files\n" if $opt_v;
- } else {
- print STDERR "No documentation found for '$_'\n";
- }
- }
- push(@found,@files);
- }
-
- if(!@found) {
- exit ($Is_VMS ? 98962 : 1);
- }
-
- if( ! -t STDOUT ) { $opt_f = 1 }
-
- unless($Is_VMS) {
- $tmp = "/tmp/perldoc1.$$";
- $goodresult = 0;
- @pagers = qw( more less pg view cat );
- unshift(@pagers,$ENV{PAGER}) if $ENV{PAGER};
- } else {
- $tmp = 'Sys$Scratch:perldoc.tmp1_'.$$;
- @pagers = qw( most more less type/page );
- unshift(@pagers,$ENV{PERLDOC_PAGER}) if $ENV{PERLDOC_PAGER};
- $goodresult = 1;
- }
-
- if ($opt_m) {
- foreach $pager (@pagers) {
- my($sts) = system("$pager @found");
- exit 0 if ($Is_VMS ? ($sts & 1) : !$sts);
- }
- exit $Is_VMS ? $sts : 1;
- }
-
- foreach (@found) {
-
- if($opt_t) {
- open(TMP,">>$tmp");
- Pod::Text::pod2text($_,*TMP);
- close(TMP);
- } elsif(not $opt_u) {
- open(TMP,">>$tmp");
- $rslt = `pod2man $_ | nroff -man`;
- if ($Is_VMS) { $err = !($? % 2) || $rslt =~ /IVVERB/; }
- else { $err = $?; }
- print TMP $rslt unless $err;
- close TMP;
- }
-
- if( $opt_u or $err or -z $tmp) {
- open(OUT,">>$tmp");
- open(IN,"<$_");
- $cut = 1;
- while (<IN>) {
- $cut = $1 eq 'cut' if /^=(\w+)/;
- next if $cut;
- print OUT;
- }
- close(IN);
- close(OUT);
- }
- }
-
- if( $opt_f ) {
- open(TMP,"<$tmp");
- print while <TMP>;
- close(TMP);
- } else {
- foreach $pager (@pagers) {
- $sts = system("$pager $tmp");
- last if $Is_VMS && ($sts & 1);
- last unless $sts;
- }
- }
-
- 1 while unlink($tmp); #Possibly pointless VMSism
-
- exit 0;
-
- __END__
-
- =head1 NAME
-
- perldoc - Look up Perl documentation in pod format.
-
- =head1 SYNOPSIS
-
- B<perldoc> [B<-h>] [B<-v>] [B<-t>] [B<-u>] PageName|ModuleName|ProgramName
-
- =head1 DESCRIPTION
-
- I<perldoc> looks up a piece of documentation in .pod format that is
- embedded in the perl installation tree or in a perl script, and displays
- it via pod2man | nroff -man | $PAGER. This is primarily used for the
- documentation for the perl library modules.
-
- Your system may also have man pages installed for those modules, in
- which case you can probably just use the man(1) command.
-
- =head1 OPTIONS
-
- =over 5
-
- =item B<-h> help
-
- Prints out a brief help message.
-
- =item B<-v> verbose
-
- Describes search for the item in detail.
-
- =item B<-t> text output
-
- Display docs using plain text converter, instead of nroff. This may be faster,
- but it won't look as nice.
-
- =item B<-u> unformatted
-
- Find docs only; skip reformatting by pod2*
-
- =item B<-m> module
-
- Display the entire module: both code and unformatted pod documentation.
- This may be useful if the docs don't explain a function in the detail
- you need, and you'd like to inspect the code directly; perldoc will find
- the file for you and simply hand it off for display.
-
- =item B<PageName|ModuleName|ProgramName>
-
- The item you want to look up. Nested modules (such as C<File::Basename>)
- are specified either as C<File::Basename> or C<File/Basename>. You may also
- give a descriptive name of a page, such as C<perlfunc>. You make also give a
- partial or wrong-case name, such as "basename" for "File::Basename", but
- this will be slower, if there is more then one page with the same partial
- name, you will only get the first one.
-
- =back
-
- =head1 ENVIRONMENT
-
- Any switches in the C<PERLDOC> environment variable will be used before the
- command line arguments. C<perldoc> also searches directories
- specified by the C<PERL5LIB> (or C<PERLLIB> if C<PERL5LIB> is not
- defined) and C<PATH> environment variables.
- (The latter is so that embedded pods for executables, such as
- C<perldoc> itself, are available.)
-
- =head1 AUTHOR
-
- Kenneth Albanowski <kjahds@kjahds.com>
-
- Minor updates by Andy Dougherty <doughera@lafcol.lafayette.edu>
-
- =head1 SEE ALSO
-
- =head1 DIAGNOSTICS
-
- =cut
-
- #
- # Version 1.11: Tue Dec 26 09:54:33 EST 1995
- # Kenneth Albanowski <kjahds@kjahds.com>
- # -added Charles Bailey's further VMS patches, and -u switch
- # -added -t switch, with pod2text support
- #
- # Version 1.10: Thu Nov 9 07:23:47 EST 1995
- # Kenneth Albanowski <kjahds@kjahds.com>
- # -added VMS support
- # -added better error recognition (on no found pages, just exit. On
- # missing nroff/pod2man, just display raw pod.)
- # -added recursive/case-insensitive matching (thanks, Andreas). This
- # slows things down a bit, unfortunately. Give a precise name, and
- # it'll run faster.
- #
- # Version 1.01: Tue May 30 14:47:34 EDT 1995
- # Andy Dougherty <doughera@lafcol.lafayette.edu>
- # -added pod documentation.
- # -added PATH searching.
- # -added searching pod/ subdirectory (mainly to pick up perlfunc.pod
- # and friends.
- #
- #
- # TODO:
- #
- # Cache directories read during sloppy match
- !NO!SUBS!
-
- close OUT or die "Can't close $file: $!";
- chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
- exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';
-