#!/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 ; 

}