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Current File : //usr/lib/rpm/redhat/perl.req
#!/usr/bin/perl

# RPM (and it's source code) is covered under two separate licenses. 

# The entire code base may be distributed under the terms of the GNU
# General Public License (GPL), which appears immediately below.
# Alternatively, all of the source code in the lib subdirectory of the
# RPM source code distribution as well as any code derived from that
# code may instead be distributed under the GNU Library General Public
# License (LGPL), at the choice of the distributor. The complete text
# of the LGPL appears at the bottom of this file.

# This alternatively is allowed to enable applications to be linked
# against the RPM library (commonly called librpm) without forcing
# such applications to be distributed under the GPL.

# Any questions regarding the licensing of RPM should be addressed to
# Erik Troan <ewt@redhat.com>.

# a simple makedepends like script for perl.
 
# To save development time I do not parse the perl grammmar but
# instead just lex it looking for what I want.  I take special care to
# ignore comments and pod's.

# It would be much better if perl could tell us the dependencies of a
# given script.

# The filenames to scan are either passed on the command line or if
# that is empty they are passed via stdin.

# If there are strings in the file which match the pattern
#     m/^\s*\$RPM_Requires\s*=\s*["'](.*)['"]/i
# then these are treated as additional names which are required by the
# file and are printed as well.

# I plan to rewrite this in C so that perl is not required by RPM at
# build time.

# by Ken Estes Mail.com kestes@staff.mail.com

if ("@ARGV") {
  foreach (@ARGV) {
    process_file($_);
  }
} else {
  
  # notice we are passed a list of filenames NOT as common in unix the
  # contents of the file.
  
  foreach (<>) {
    process_file($_);
  }
}


foreach $module (sort keys %require) {
  if (length($require{$module}) == 0) {
    print "perl($module)\n";
  } else {

    # I am not using rpm3.0 so I do not want spaces arround my
    # operators. Also I will need to change the processing of the
    # $RPM_* vairable when I upgrage.

    print "perl($module) >= $require{$module}\n";
  }
}

exit 0;



sub process_file {
  
  my ($file) = @_;
  chomp $file;
  
  open(FILE, "<$file") || return;
  
  while (<FILE>) {
    
    # skip the documentation

    # we should not need to have item in this if statement (it
    # properly belongs in the over/back section) but people do not
    # read the perldoc.

    if ( (m/^=(head1|head2|pod|item)/) .. (m/^=(cut)/) ) {
      next;
    }

    if ( (m/^=(over)/) .. (m/^=(back)/) ) {
      next;
    }
    
    # skip the data section
    if (m/^__(DATA|END)__$/) {
      last;
    }

    # Each keyword can appear multiple times.  Don't
    #  bother with datastructures to store these strings,
    #  if we need to print it print it now.
    
    if ( m/^\s*\$RPM_Requires\s*=\s*["'](.*)['"]/i) {
      foreach $_ (split(/\s+/, $1)) {
	print "$_\n";
      }
    }

    if ( 

# ouch could be in a eval, perhaps we do not want these since we catch
# an exception they must not be required

#   eval { require Term::ReadLine } or die $@;
#   eval "require Term::Rendezvous;" or die $@;
#   eval { require Carp } if defined $^S; # If error/warning during compilation,


	(m/^(\s*)         # we hope the inclusion starts the line
	 (require|use)\s+(?!\{)     # do not want 'do {' loops
	 # quotes around name are always legal
	 [\'\"]?([^\;\ \'\"\t]*)[\'\"]?[\t\;\ ]
	 # the syntax for 'use' allows version requirements
	 \s*([.0-9]*)
	 /x)
       ) {
      my ($whitespace, $statement, $module, $version) = ($1, $2, $3,$4);

      # we only consider require statements that are flush against
      # the left edge. any other require statements give too many
      # false positives, as they are usually inside of an if statement
      # as a fallback module or a rarely used option

      ($whitespace ne "" && $statement eq "require") && next;

      # if there is some interpolation of variables just skip this
      # dependency, we do not want
      #        do "$ENV{LOGDIR}/$rcfile";
   
      ($module =~ m/\$/) && next;

      # skip if the phrase was "use of" -- shows up in gimp-perl, et al
      next if $module eq 'of';

      # if the module ends in a comma we probaly caught some
      # documentation of the form 'check stuff,\n do stuff, clean
      # stuff.' there are several of these in the perl distribution

      ($module  =~ m/[,>]$/) && next;

      # if the module name starts in a dot it is not a module name.
      # Is this necessary?  Please give me an example if you turn this
      # back on.

      #      ($module =~ m/^\./) && next;

      # if the module ends with .pm strip it to leave only basename.
      # starts with /, which means its an absolute path to a file
      if ($module =~ m(^/)) {
        print "$module\n";
        next;
      }

      # sometimes people do use POSIX qw(foo), or use POSIX(qw(foo)) etc
      # we can strip qw.*$, as well as (.*$:
      $module =~ s/qw.*$//;
      $module =~ s/\(*$//;

      $module =~ s/\.pm$//;

      # some perl programmers write 'require URI/URL;' when 
      # they mean 'require URI::URL;'

      $module =~ s/\//::/;

      # trim off trailing parenthesis if any.  Sometimes people pass
      # the module an empty list.

      $module =~ s/\(\s*\)$//;

      if ( $module =~ m/^[0-9._]+$/ ) {
      # if module is a number then both require and use interpret that
      # to mean that a particular version of perl is specified

      if ($module =~ /5.00/) {
        print "perl >= 0:$module\n";
        next;
      }
      else {
        print "perl >= 1:$module\n";
        next;
      }

      };

      # ph files do not use the package name inside the file.
      # perlmodlib  documentation says:
      
      #       the .ph files made by h2ph will probably end up as
      #       extension modules made by h2xs.
      
      # so do not expend much effort on these.


      # there is no easy way to find out if a file named systeminfo.ph
      # will be included with the name sys/systeminfo.ph so only use the
      # basename of *.ph files

      ($module  =~ m/\.ph$/) && next;

      $require{$module}=$version;
      $line{$module}=$_;
    }
    
  }

  close(FILE) ||
    die("$0: Could not close file: '$file' : $!\n");
  
  return ; 
}
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