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# -*- mode: cperl; tab-width: 8; indent-tabs-mode: nil; basic-offset: 2 -*-
# vim:ts=8:sw=2:et:sta:sts=2
package Module::Build::Base;

use strict;
use vars qw($VERSION);
$VERSION = '0.35_03';
$VERSION = eval $VERSION;
BEGIN { require 5.00503 }

use Carp;
use Cwd ();
use File::Copy ();
use File::Find ();
use File::Path ();
use File::Basename ();
use File::Spec 0.82 ();
use File::Compare ();
use Module::Build::Dumper ();
use IO::File ();
use Text::ParseWords ();

use Module::Build::ModuleInfo;
use Module::Build::Notes;
use Module::Build::Config;
use Module::Build::Version;


#################### Constructors ###########################
sub new {
  my $self = shift()->_construct(@_);

  $self->{invoked_action} = $self->{action} ||= 'Build_PL';
  $self->cull_args(@ARGV);
  
  die "Too early to specify a build action '$self->{action}'. Do 'Build $self->{action}' instead.\n"
    if $self->{action} && $self->{action} ne 'Build_PL';

  $self->check_manifest;
  $self->auto_require;
  if ( $self->check_prereq + $self->check_autofeatures != 2) {
    $self->log_warn(<<EOF);

ERRORS/WARNINGS FOUND IN PREREQUISITES. You may wish to install the versions
of the modules indicated above before proceeding with this installation

EOF
    unless ( $ENV{PERL5_CPANPLUS_IS_RUNNING} || $ENV{PERL5_CPAN_IS_RUNNING} ) {
      $self->log_warn(
        "Run 'Build installdeps' to install missing prerequisites.\n\n"
      );
    }
  }

  $self->dist_name;
  $self->dist_version;

  $self->_find_nested_builds;

  return $self;
}

sub resume {
  my $package = shift;
  my $self = $package->_construct(@_);
  $self->read_config;

  # If someone called Module::Build->current() or
  # Module::Build->new_from_context() and the correct class to use is
  # actually a *subclass* of Module::Build, we may need to load that
  # subclass here and re-delegate the resume() method to it.
  unless ( UNIVERSAL::isa($package, $self->build_class) ) {
    my $build_class = $self->build_class;
    my $config_dir = $self->config_dir || '_build';
    my $build_lib = File::Spec->catdir( $config_dir, 'lib' );
    unshift( @INC, $build_lib );
    unless ( $build_class->can('new') ) {
      eval "require $build_class; 1" or die "Failed to re-load '$build_class': $@";
    }
    return $build_class->resume(@_);
  }

  unless ($self->_perl_is_same($self->{properties}{perl})) {
    my $perl = $self->find_perl_interpreter;
    $self->log_warn(" * WARNING: Configuration was initially created with '$self->{properties}{perl}',\n".
" but we are now using '$perl'.\n");
  }
  
  $self->cull_args(@ARGV);

  unless ($self->allow_mb_mismatch) {
    my $mb_version = $Module::Build::VERSION;
    die(" * ERROR: Configuration was initially created with Module::Build version '$self->{properties}{mb_version}',\n".
" but we are now using version '$mb_version'. Please re-run the Build.PL or Makefile.PL script,\n".
" or use --allow_mb_mismatch 1 to skip this version check.\n")
    if $mb_version ne $self->{properties}{mb_version};
  }
  
  $self->{invoked_action} = $self->{action} ||= 'build';

  return $self;
}

sub new_from_context {
  my ($package, %args) = @_;
  
  $package->run_perl_script('Build.PL',[],[$package->unparse_args(\%args)]);
  return $package->resume;
}

sub current {
  # hmm, wonder what the right thing to do here is
  local @ARGV;
  return shift()->resume;
}

sub _construct {
  my ($package, %input) = @_;

  my $args = delete $input{args} || {};
  my $config = delete $input{config} || {};

  my $self = bless {
args => {%$args},
config => Module::Build::Config->new(values => $config),
properties => {
base_dir => $package->cwd,
mb_version => $Module::Build::VERSION,
%input,
},
phash => {},
                    stash => {}, # temporary caching, not stored in _build
}, $package;

  $self->_set_defaults;
  my ($p, $ph) = ($self->{properties}, $self->{phash});

  foreach (qw(notes config_data features runtime_params cleanup auto_features)) {
    my $file = File::Spec->catfile($self->config_dir, $_);
    $ph->{$_} = Module::Build::Notes->new(file => $file);
    $ph->{$_}->restore if -e $file;
    if (exists $p->{$_}) {
      my $vals = delete $p->{$_};
      while (my ($k, $v) = each %$vals) {
$self->$_($k, $v);
      }
    }
  }

  # The following warning could be unnecessary if the user is running
  # an embedded perl, but there aren't too many of those around, and
  # embedded perls aren't usually used to install modules, and the
  # installation process sometimes needs to run external scripts
  # (e.g. to run tests).
  $p->{perl} = $self->find_perl_interpreter
    or $self->log_warn("Warning: Can't locate your perl binary");

  my $blibdir = sub { File::Spec->catdir($p->{blib}, @_) };
  $p->{bindoc_dirs} ||= [ $blibdir->("script") ];
  $p->{libdoc_dirs} ||= [ $blibdir->("lib"), $blibdir->("arch") ];

  $p->{dist_author} = [ $p->{dist_author} ] if defined $p->{dist_author} and not ref $p->{dist_author};

  # Synonyms
  $p->{requires} = delete $p->{prereq} if defined $p->{prereq};
  $p->{script_files} = delete $p->{scripts} if defined $p->{scripts};

  # Convert to from shell strings to arrays
  for ('extra_compiler_flags', 'extra_linker_flags') {
    $p->{$_} = [ $self->split_like_shell($p->{$_}) ] if exists $p->{$_};
  }

  # Convert to arrays
  for ('include_dirs') {
    $p->{$_} = [ $p->{$_} ] if exists $p->{$_} && !ref $p->{$_}
  }

  $self->add_to_cleanup( @{delete $p->{add_to_cleanup}} )
    if $p->{add_to_cleanup};

  return $self;
}

################## End constructors #########################

sub log_info {
  my $self = shift;
  print @_ unless(ref($self) and $self->quiet);
}
sub log_verbose {
  my $self = shift;
  $self->log_info(@_) if(ref($self) and $self->verbose);
}
sub log_debug {
  my $self = shift;
  print @_ if ref $self && $self->debug;
}

sub log_warn {
  # Try to make our call stack invisible
  shift;
  if (@_ and $_[-1] !~ /\n$/) {
    my (undef, $file, $line) = caller();
    warn @_, " at $file line $line.\n";
  } else {
    warn @_;
  }
}


# install paths must be generated when requested to be sure all changes
# to config (from various sources) are included
sub _default_install_paths {
  my $self = shift;
  my $c = $self->{config};
  my $p = {};

  my @libstyle = $c->get('installstyle') ?
      File::Spec->splitdir($c->get('installstyle')) : qw(lib perl5);
  my $arch = $c->get('archname');
  my $version = $c->get('version');

  my $bindoc = $c->get('installman1dir') || undef;
  my $libdoc = $c->get('installman3dir') || undef;

  my $binhtml = $c->get('installhtml1dir') || $c->get('installhtmldir') || undef;
  my $libhtml = $c->get('installhtml3dir') || $c->get('installhtmldir') || undef;

  $p->{install_sets} =
    {
     core => {
lib => $c->get('installprivlib'),
arch => $c->get('installarchlib'),
bin => $c->get('installbin'),
script => $c->get('installscript'),
bindoc => $bindoc,
libdoc => $libdoc,
binhtml => $binhtml,
libhtml => $libhtml,
},
     site => {
lib => $c->get('installsitelib'),
arch => $c->get('installsitearch'),
bin => $c->get('installsitebin') || $c->get('installbin'),
script => $c->get('installsitescript') ||
$c->get('installsitebin') || $c->get('installscript'),
bindoc => $c->get('installsiteman1dir') || $bindoc,
libdoc => $c->get('installsiteman3dir') || $libdoc,
binhtml => $c->get('installsitehtml1dir') || $binhtml,
libhtml => $c->get('installsitehtml3dir') || $libhtml,
},
     vendor => {
lib => $c->get('installvendorlib'),
arch => $c->get('installvendorarch'),
bin => $c->get('installvendorbin') || $c->get('installbin'),
script => $c->get('installvendorscript') ||
$c->get('installvendorbin') || $c->get('installscript'),
bindoc => $c->get('installvendorman1dir') || $bindoc,
libdoc => $c->get('installvendorman3dir') || $libdoc,
binhtml => $c->get('installvendorhtml1dir') || $binhtml,
libhtml => $c->get('installvendorhtml3dir') || $libhtml,
},
    };

  $p->{original_prefix} =
    {
     core => $c->get('installprefixexp') || $c->get('installprefix') ||
               $c->get('prefixexp') || $c->get('prefix') || '',
     site => $c->get('siteprefixexp'),
     vendor => $c->get('usevendorprefix') ? $c->get('vendorprefixexp') : '',
    };
  $p->{original_prefix}{site} ||= $p->{original_prefix}{core};

  # Note: you might be tempted to use $Config{installstyle} here
  # instead of hard-coding lib/perl5, but that's been considered and
  # (at least for now) rejected. `perldoc Config` has some wisdom
  # about it.
  $p->{install_base_relpaths} =
    {
     lib => ['lib', 'perl5'],
     arch => ['lib', 'perl5', $arch],
     bin => ['bin'],
     script => ['bin'],
     bindoc => ['man', 'man1'],
     libdoc => ['man', 'man3'],
     binhtml => ['html'],
     libhtml => ['html'],
    };

  $p->{prefix_relpaths} =
    {
     core => {
lib => [@libstyle],
arch => [@libstyle, $version, $arch],
bin => ['bin'],
script => ['bin'],
bindoc => ['man', 'man1'],
libdoc => ['man', 'man3'],
binhtml => ['html'],
libhtml => ['html'],
},
     vendor => {
lib => [@libstyle],
arch => [@libstyle, $version, $arch],
bin => ['bin'],
script => ['bin'],
bindoc => ['man', 'man1'],
libdoc => ['man', 'man3'],
binhtml => ['html'],
libhtml => ['html'],
},
     site => {
lib => [@libstyle, 'site_perl'],
arch => [@libstyle, 'site_perl', $version, $arch],
bin => ['bin'],
script => ['bin'],
bindoc => ['man', 'man1'],
libdoc => ['man', 'man3'],
binhtml => ['html'],
libhtml => ['html'],
},
    };
    return $p
}

sub _find_nested_builds {
  my $self = shift;
  my $r = $self->recurse_into or return;

  my ($file, @r);
  if (!ref($r) && $r eq 'auto') {
    local *DH;
    opendir DH, $self->base_dir
      or die "Can't scan directory " . $self->base_dir . " for nested builds: $!";
    while (defined($file = readdir DH)) {
      my $subdir = File::Spec->catdir( $self->base_dir, $file );
      next unless -d $subdir;
      push @r, $subdir if -e File::Spec->catfile( $subdir, 'Build.PL' );
    }
  }

  $self->recurse_into(\@r);
}

sub cwd {
  return Cwd::cwd();
}

sub _quote_args {
  # Returns a string that can become [part of] a command line with
  # proper quoting so that the subprocess sees this same list of args.
  my ($self, @args) = @_;

  my @quoted;

  for (@args) {
    if ( /^[^\s*?!\$<>;\\|'"\[\]\{\}]+$/ ) {
      # Looks pretty safe
      push @quoted, $_;
    } else {
      # XXX this will obviously have to improve - is there already a
      # core module lying around that does proper quoting?
      s/('+)/'"$1"'/g;
      push @quoted, qq('$_');
    }
  }

  return join " ", @quoted;
}

sub _backticks {
  my ($self, @cmd) = @_;
  if ($self->have_forkpipe) {
    local *FH;
    my $pid = open *FH, "-|";
    if ($pid) {
      return wantarray ? <FH> : join '', <FH>;
    } else {
      die "Can't execute @cmd: $!\n" unless defined $pid;
      exec { $cmd[0] } @cmd;
    }
  } else {
    my $cmd = $self->_quote_args(@cmd);
    return `$cmd`;
  }
}

# Tells us whether the construct open($fh, '-|', @command) is
# supported. It would probably be better to dynamically sense this.
sub have_forkpipe { 1 }

# Determine whether a given binary is the same as the perl
# (configuration) that started this process.
sub _perl_is_same {
  my ($self, $perl) = @_;

  my @cmd = ($perl);

  # When run from the perl core, @INC will include the directories
  # where perl is yet to be installed. We need to reference the
  # absolute path within the source distribution where it can find
  # it's Config.pm This also prevents us from picking up a Config.pm
  # from a different configuration that happens to be already
  # installed in @INC.
  if ($ENV{PERL_CORE}) {
    push @cmd, '-I' . File::Spec->catdir(File::Basename::dirname($perl), 'lib');
  }

  push @cmd, qw(-MConfig=myconfig -e print -e myconfig);
  return $self->_backticks(@cmd) eq Config->myconfig;
}

# cache _discover_perl_interpreter() results
{
  my $known_perl;
  sub find_perl_interpreter {
    my $self = shift;

    return $known_perl if defined($known_perl);
    return $known_perl = $self->_discover_perl_interpreter;
  }
}

# Returns the absolute path of the perl interpreter used to invoke
# this process. The path is derived from $^X or $Config{perlpath}. On
# some platforms $^X contains the complete absolute path of the
# interpreter, on other it may contain a relative path, or simply
# 'perl'. This can also vary depending on whether a path was supplied
# when perl was invoked. Additionally, the value in $^X may omit the
# executable extension on platforms that use one. It's a fatal error
# if the interpreter can't be found because it can result in undefined
# behavior by routines that depend on it (generating errors or
# invoking the wrong perl.)
sub _discover_perl_interpreter {
  my $proto = shift;
  my $c = ref($proto) ? $proto->{config} : 'Module::Build::Config';

  my $perl = $^X;
  my $perl_basename = File::Basename::basename($perl);

  my @potential_perls;

  # Try 1, Check $^X for absolute path
  push( @potential_perls, $perl )
      if File::Spec->file_name_is_absolute($perl);

  # Try 2, Check $^X for a valid relative path
  my $abs_perl = File::Spec->rel2abs($perl);
  push( @potential_perls, $abs_perl );

  # Try 3, Last ditch effort: These two option use hackery to try to locate
  # a suitable perl. The hack varies depending on whether we are running
  # from an installed perl or an uninstalled perl in the perl source dist.
  if ($ENV{PERL_CORE}) {

    # Try 3.A, If we are in a perl source tree, running an uninstalled
    # perl, we can keep moving up the directory tree until we find our
    # binary. We wouldn't do this under any other circumstances.

    # CBuilder is also in the core, so it should be available here
    require ExtUtils::CBuilder;
    my $perl_src = Cwd::realpath( ExtUtils::CBuilder->perl_src );
    if ( defined($perl_src) && length($perl_src) ) {
      my $uninstperl =
        File::Spec->rel2abs(File::Spec->catfile( $perl_src, $perl_basename ));
      push( @potential_perls, $uninstperl );
    }

  } else {

    # Try 3.B, First look in $Config{perlpath}, then search the user's
    # PATH. We do not want to do either if we are running from an
    # uninstalled perl in a perl source tree.

    push( @potential_perls, $c->get('perlpath') );

    push( @potential_perls,
          map File::Spec->catfile($_, $perl_basename), File::Spec->path() );
  }

  # Now that we've enumerated the potential perls, it's time to test
  # them to see if any of them match our configuration, returning the
  # absolute path of the first successful match.
  my $exe = $c->get('exe_ext');
  foreach my $thisperl ( @potential_perls ) {

    if (defined $exe) {
      $thisperl .= $exe unless $thisperl =~ m/$exe$/i;
    }

    if ( -f $thisperl && $proto->_perl_is_same($thisperl) ) {
      return $thisperl;
    }
  }

  # We've tried all alternatives, and didn't find a perl that matches
  # our configuration. Throw an exception, and list alternatives we tried.
  my @paths = map File::Basename::dirname($_), @potential_perls;
  die "Can't locate the perl binary used to run this script " .
      "in (@paths)\n";
}

sub _is_interactive {
  return -t STDIN && (-t STDOUT || !(-f STDOUT || -c STDOUT)) ; # Pipe?
}

# NOTE this is a blocking operation if(-t STDIN)
sub _is_unattended {
  my $self = shift;
  return $ENV{PERL_MM_USE_DEFAULT} ||
    ( !$self->_is_interactive && eof STDIN );
}

sub _readline {
  my $self = shift;
  return undef if $self->_is_unattended;

  my $answer = <STDIN>;
  chomp $answer if defined $answer;
  return $answer;
}

sub prompt {
  my $self = shift;
  my $mess = shift
    or die "prompt() called without a prompt message";

  # use a list to distinguish a default of undef() from no default
  my @def;
  @def = (shift) if @_;
  # use dispdef for output
  my @dispdef = scalar(@def) ?
    ('[', (defined($def[0]) ? $def[0] . ' ' : ''), ']') :
    (' ', '');

  local $|=1;
  print "$mess ", @dispdef;

  if ( $self->_is_unattended && !@def ) {
    die <<EOF;
ERROR: This build seems to be unattended, but there is no default value
for this question. Aborting.
EOF
  }

  my $ans = $self->_readline();

  if ( !defined($ans) # Ctrl-D or unattended
       or !length($ans) ) { # User hit return
    print "$dispdef[1]\n";
    $ans = scalar(@def) ? $def[0] : '';
  }

  return $ans;
}

sub y_n {
  my $self = shift;
  my ($mess, $def) = @_;

  die "y_n() called without a prompt message" unless $mess;
  die "Invalid default value: y_n() default must be 'y' or 'n'"
    if $def && $def !~ /^[yn]/i;

  my $answer;
  while (1) { # XXX Infinite or a large number followed by an exception ?
    $answer = $self->prompt(@_);
    return 1 if $answer =~ /^y/i;
    return 0 if $answer =~ /^n/i;
    local $|=1;
    print "Please answer 'y' or 'n'.\n";
  }
}

sub current_action { shift->{action} }
sub invoked_action { shift->{invoked_action} }

sub notes { shift()->{phash}{notes}->access(@_) }
sub config_data { shift()->{phash}{config_data}->access(@_) }
sub runtime_params { shift->{phash}{runtime_params}->read( @_ ? shift : () ) } # Read-only
sub auto_features { shift()->{phash}{auto_features}->access(@_) }

sub features {
  my $self = shift;
  my $ph = $self->{phash};

  if (@_) {
    my $key = shift;
    if ($ph->{features}->exists($key)) {
      return $ph->{features}->access($key, @_);
    }

    if (my $info = $ph->{auto_features}->access($key)) {
      my $failures = $self->prereq_failures($info);
      my $disabled = grep( /^(?:\w+_)?(?:requires|conflicts)$/,
keys %$failures ) ? 1 : 0;
      return !$disabled;
    }

    return $ph->{features}->access($key, @_);
  }

  # No args - get the auto_features & overlay the regular features
  my %features;
  my %auto_features = $ph->{auto_features}->access();
  while (my ($name, $info) = each %auto_features) {
    my $failures = $self->prereq_failures($info);
    my $disabled = grep( /^(?:\w+_)?(?:requires|conflicts)$/,
keys %$failures ) ? 1 : 0;
    $features{$name} = $disabled ? 0 : 1;
  }
  %features = (%features, $ph->{features}->access());

  return wantarray ? %features : \%features;
}
BEGIN { *feature = \&features } # Alias

sub _mb_feature {
  my $self = shift;
  
  if (($self->module_name || '') eq 'Module::Build') {
    # We're building Module::Build itself, so ...::ConfigData isn't
    # valid, but $self->features() should be.
    return $self->feature(@_);
  } else {
    require Module::Build::ConfigData;
    return Module::Build::ConfigData->feature(@_);
  }
}


sub add_build_element {
    my ($self, $elem) = @_;
    my $elems = $self->build_elements;
    push @$elems, $elem unless grep { $_ eq $elem } @$elems;
}

sub ACTION_config_data {
  my $self = shift;
  return unless $self->has_config_data;
  
  my $module_name = $self->module_name
    or die "The config_data feature requires that 'module_name' be set";
  my $notes_name = $module_name . '::ConfigData'; # TODO: Customize name ???
  my $notes_pm = File::Spec->catfile($self->blib, 'lib', split /::/, "$notes_name.pm");

  return if $self->up_to_date(['Build.PL',
$self->config_file('config_data'),
$self->config_file('features')
], $notes_pm);

  $self->log_verbose("Writing config notes to $notes_pm\n");
  File::Path::mkpath(File::Basename::dirname($notes_pm));

  Module::Build::Notes->write_config_data
      (
       file => $notes_pm,
       module => $module_name,
       config_module => $notes_name,
       config_data => scalar $self->config_data,
       feature => scalar $self->{phash}{features}->access(),
       auto_features => scalar $self->auto_features,
      );
}

########################################################################
{ # enclosing these lexicals -- TODO
  my %valid_properties = ( __PACKAGE__, {} );
  my %additive_properties;

  sub _mb_classes {
    my $class = ref($_[0]) || $_[0];
    return ($class, $class->mb_parents);
  }

  sub valid_property {
    my ($class, $prop) = @_;
    return grep exists( $valid_properties{$_}{$prop} ), $class->_mb_classes;
  }

  sub valid_properties {
    return keys %{ shift->valid_properties_defaults() };
  }

  sub valid_properties_defaults {
    my %out;
    for my $class (reverse shift->_mb_classes) {
      @out{ keys %{ $valid_properties{$class} } } = map {
        $_->()
      } values %{ $valid_properties{$class} };
    }
    return \%out;
  }

  sub array_properties {
    for (shift->_mb_classes) {
      return @{$additive_properties{$_}->{ARRAY}}
        if exists $additive_properties{$_}->{ARRAY};
    }
  }

  sub hash_properties {
    for (shift->_mb_classes) {
      return @{$additive_properties{$_}->{'HASH'}}
        if exists $additive_properties{$_}->{'HASH'};
    }
  }

  sub add_property {
    my ($class, $property) = (shift, shift);
    die "Property '$property' already exists"
      if $class->valid_property($property);
    my %p = @_ == 1 ? ( default => shift ) : @_;

    my $type = ref $p{default};
    $valid_properties{$class}{$property} =
      $type eq 'CODE' ? $p{default} :
      $type eq 'HASH' ? sub { return { %{ $p{default} } } } :
      $type eq 'ARRAY'? sub { return [ @{ $p{default} } ] } :
                        sub { return $p{default} } ;

    push @{$additive_properties{$class}->{$type}}, $property
      if $type;

    unless ($class->can($property)) {
      # TODO probably should put these in a util package
      my $sub = $type eq 'HASH'
        ? _make_hash_accessor($property, \%p)
        : _make_accessor($property, \%p);
      no strict 'refs';
      *{"$class\::$property"} = $sub;
    }

    return $class;
  }

    sub property_error {
      my $self = shift;
      die 'ERROR: ', @_;
    }

  sub _set_defaults {
    my $self = shift;

    # Set the build class.
    $self->{properties}{build_class} ||= ref $self;

    # If there was no orig_dir, set to the same as base_dir
    $self->{properties}{orig_dir} ||= $self->{properties}{base_dir};

    my $defaults = $self->valid_properties_defaults;

    foreach my $prop (keys %$defaults) {
      $self->{properties}{$prop} = $defaults->{$prop}
        unless exists $self->{properties}{$prop};
    }

    # Copy defaults for arrays any arrays.
    for my $prop ($self->array_properties) {
      $self->{properties}{$prop} = [@{$defaults->{$prop}}]
        unless exists $self->{properties}{$prop};
    }
    # Copy defaults for arrays any hashes.
    for my $prop ($self->hash_properties) {
      $self->{properties}{$prop} = {%{$defaults->{$prop}}}
        unless exists $self->{properties}{$prop};
    }
  }

} # end closure
########################################################################
sub _make_hash_accessor {
  my ($property, $p) = @_;
  my $check = $p->{check} || sub { 1 };

  return sub {
    my $self = shift;

    # This is only here to deprecate the historic accident of calling
    # properties as class methods - I suspect it only happens in our
    # test suite.
    unless(ref($self)) {
      carp("\n$property not a class method (@_)");
      return;
    }

    my $x = $self->{properties};
    return $x->{$property} unless @_;

    my $prop = $x->{$property};
    if ( defined $_[0] && !ref $_[0] ) {
      if ( @_ == 1 ) {
        return exists $prop->{$_[0]} ? $prop->{$_[0]} : undef;
      } elsif ( @_ % 2 == 0 ) {
        my %new = (%{ $prop }, @_);
        local $_ = \%new;
        $x->{$property} = \%new if $check->($self);
        return $x->{$property};
      } else {
        die "Unexpected arguments for property '$property'\n";
      }
    } else {
      die "Unexpected arguments for property '$property'\n"
          if defined $_[0] && ref $_[0] ne 'HASH';
      local $_ = $_[0];
      $x->{$property} = shift if $check->($self);
    }
  };
}
########################################################################
sub _make_accessor {
  my ($property, $p) = @_;
  my $check = $p->{check} || sub { 1 };

  return sub {
    my $self = shift;

    # This is only here to deprecate the historic accident of calling
    # properties as class methods - I suspect it only happens in our
    # test suite.
    unless(ref($self)) {
      carp("\n$property not a class method (@_)");
      return;
    }

    my $x = $self->{properties};
    return $x->{$property} unless @_;
    local $_ = $_[0];
    $x->{$property} = shift if $check->($self);
    return $x->{$property};
  };
}
########################################################################

# Add the default properties.
__PACKAGE__->add_property(auto_configure_requires => 1);
__PACKAGE__->add_property(blib => 'blib');
__PACKAGE__->add_property(build_class => 'Module::Build');
__PACKAGE__->add_property(build_elements => [qw(PL support pm xs share_dir pod script)]);
__PACKAGE__->add_property(build_script => 'Build');
__PACKAGE__->add_property(build_bat => 0);
__PACKAGE__->add_property(config_dir => '_build');
__PACKAGE__->add_property(include_dirs => []);
__PACKAGE__->add_property(license => 'unknown');
__PACKAGE__->add_property(metafile => 'META.yml');
__PACKAGE__->add_property(mymetafile => 'MYMETA.yml');
__PACKAGE__->add_property(recurse_into => []);
__PACKAGE__->add_property(use_rcfile => 1);
__PACKAGE__->add_property(create_packlist => 1);
__PACKAGE__->add_property(allow_mb_mismatch => 0);
__PACKAGE__->add_property(config => undef);
__PACKAGE__->add_property(test_file_exts => ['.t']);
__PACKAGE__->add_property(use_tap_harness => 0);
__PACKAGE__->add_property(cpan_client => 'cpan');
__PACKAGE__->add_property(tap_harness_args => {});
__PACKAGE__->add_property(
  'installdirs',
  default => 'site',
  check => sub {
    return 1 if /^(core|site|vendor)$/;
    return shift->property_error(
      $_ eq 'perl'
      ? 'Perhaps you meant installdirs to be "core" rather than "perl"?'
      : 'installdirs must be one of "core", "site", or "vendor"'
    );
    return shift->property_error("Perhaps you meant 'core'?") if $_ eq 'perl';
    return 0;
  },
);

{
  my $Is_ActivePerl = eval {require ActivePerl::DocTools};
  __PACKAGE__->add_property(html_css => $Is_ActivePerl ? 'Active.css' : '');
}

{
  my @prereq_action_types = qw(requires build_requires conflicts recommends);
  foreach my $type (@prereq_action_types) {
    __PACKAGE__->add_property($type => {});
  }
  __PACKAGE__->add_property(prereq_action_types => \@prereq_action_types);
}

__PACKAGE__->add_property($_ => {}) for qw(
get_options
install_base_relpaths
install_path
install_sets
meta_add
meta_merge
original_prefix
prefix_relpaths
configure_requires
);

__PACKAGE__->add_property($_) for qw(
PL_files
autosplit
base_dir
bindoc_dirs
c_source
create_license
create_makefile_pl
create_readme
debugger
destdir
dist_abstract
dist_author
dist_name
dist_version
dist_version_from
extra_compiler_flags
extra_linker_flags
has_config_data
install_base
libdoc_dirs
magic_number
mb_version
module_name
needs_compiler
orig_dir
perl
pm_files
pod_files
pollute
prefix
program_name
quiet
recursive_test_files
script_files
scripts
share_dir
sign
test_files
verbose
debug
xs_files
);

sub config {
  my $self = shift;
  my $c = ref($self) ? $self->{config} : 'Module::Build::Config';
  return $c->all_config unless @_;

  my $key = shift;
  return $c->get($key) unless @_;

  my $val = shift;
  return $c->set($key => $val);
}

sub mb_parents {
    # Code borrowed from Class::ISA.
    my @in_stack = (shift);
    my %seen = ($in_stack[0] => 1);

    my ($current, @out);
    while (@in_stack) {
        next unless defined($current = shift @in_stack)
          && $current->isa('Module::Build::Base');
        push @out, $current;
        next if $current eq 'Module::Build::Base';
        no strict 'refs';
        unshift @in_stack,
          map {
              my $c = $_; # copy, to avoid being destructive
              substr($c,0,2) = "main::" if substr($c,0,2) eq '::';
              # Canonize the :: -> main::, ::foo -> main::foo thing.
              # Should I ever canonize the Foo'Bar = Foo::Bar thing?
              $seen{$c}++ ? () : $c;
          } @{"$current\::ISA"};

        # I.e., if this class has any parents (at least, ones I've never seen
        # before), push them, in order, onto the stack of classes I need to
        # explore.
    }
    shift @out;
    return @out;
}

sub extra_linker_flags { shift->_list_accessor('extra_linker_flags', @_) }
sub extra_compiler_flags { shift->_list_accessor('extra_compiler_flags', @_) }

sub _list_accessor {
  (my $self, local $_) = (shift, shift);
  my $p = $self->{properties};
  $p->{$_} = [@_] if @_;
  $p->{$_} = [] unless exists $p->{$_};
  return ref($p->{$_}) ? $p->{$_} : [$p->{$_}];
}

# XXX Problem - if Module::Build is loaded from a different directory,
# it'll look for (and perhaps destroy/create) a _build directory.
sub subclass {
  my ($pack, %opts) = @_;

  my $build_dir = '_build'; # XXX The _build directory is ostensibly settable by the user. Shouldn't hard-code here.
  $pack->delete_filetree($build_dir) if -e $build_dir;

  die "Must provide 'code' or 'class' option to subclass()\n"
    unless $opts{code} or $opts{class};

  $opts{code} ||= '';
  $opts{class} ||= 'MyModuleBuilder';
  
  my $filename = File::Spec->catfile($build_dir, 'lib', split '::', $opts{class}) . '.pm';
  my $filedir = File::Basename::dirname($filename);
  $pack->log_verbose("Creating custom builder $filename in $filedir\n");
  
  File::Path::mkpath($filedir);
  die "Can't create directory $filedir: $!" unless -d $filedir;
  
  my $fh = IO::File->new("> $filename") or die "Can't create $filename: $!";
  print $fh <<EOF;
package $opts{class};
use $pack;
\@ISA = qw($pack);
$opts{code}
1;
EOF
  close $fh;
  
  unshift @INC, File::Spec->catdir(File::Spec->rel2abs($build_dir), 'lib');
  eval "use $opts{class}";
  die $@ if $@;

  return $opts{class};
}

sub dist_name {
  my $self = shift;
  my $p = $self->{properties};
  return $p->{dist_name} if defined $p->{dist_name};
  
  die "Can't determine distribution name, must supply either 'dist_name' or 'module_name' parameter"
    unless $self->module_name;
  
  ($p->{dist_name} = $self->module_name) =~ s/::/-/g;
  
  return $p->{dist_name};
}

sub dist_version_from {
  my ($self) = @_;
  my $p = $self->{properties};
  if ($self->module_name) {
    $p->{dist_version_from} ||=
join( '/', 'lib', split(/::/, $self->module_name) ) . '.pm';
  }
  return $p->{dist_version_from} || undef;
}

sub dist_version {
  my ($self) = @_;
  my $p = $self->{properties};

  return $p->{dist_version} if defined $p->{dist_version};

  if ( my $dist_version_from = $self->dist_version_from ) {
    my $version_from = File::Spec->catfile( split( qr{/}, $dist_version_from ) );
    my $pm_info = Module::Build::ModuleInfo->new_from_file( $version_from )
      or die "Can't find file $version_from to determine version";
    $p->{dist_version} = $self->normalize_version( $pm_info->version() );
  }

  die ("Can't determine distribution version, must supply either 'dist_version',\n".
       "'dist_version_from', or 'module_name' parameter")
    unless defined $p->{dist_version};

  return $p->{dist_version};
}

sub dist_author { shift->_pod_parse('author') }
sub dist_abstract { shift->_pod_parse('abstract') }

sub _pod_parse {
  my ($self, $part) = @_;
  my $p = $self->{properties};
  my $member = "dist_$part";
  return $p->{$member} if defined $p->{$member};
  
  my $docfile = $self->_main_docfile
    or return;
  my $fh = IO::File->new($docfile)
    or return;
  
  require Module::Build::PodParser;
  my $parser = Module::Build::PodParser->new(fh => $fh);
  my $method = "get_$part";
  return $p->{$member} = $parser->$method();
}

sub version_from_file { # Method provided for backwards compatibility
  return Module::Build::ModuleInfo->new_from_file($_[1])->version();
}

sub find_module_by_name { # Method provided for backwards compatibility
  return Module::Build::ModuleInfo->find_module_by_name(@_[1,2]);
}

sub add_to_cleanup {
  my $self = shift;
  my %files = map {$self->localize_file_path($_), 1} @_;
  $self->{phash}{cleanup}->write(\%files);
}

sub cleanup {
  my $self = shift;
  my $all = $self->{phash}{cleanup}->read;
  return keys %$all;
}

sub config_file {
  my $self = shift;
  return unless -d $self->config_dir;
  return File::Spec->catfile($self->config_dir, @_);
}

sub read_config {
  my ($self) = @_;
  
  my $file = $self->config_file('build_params')
    or die "Can't find 'build_params' in " . $self->config_dir;
  my $fh = IO::File->new($file) or die "Can't read '$file': $!";
  my $ref = eval do {local $/; <$fh>};
  die if $@;
  my $c;
  ($self->{args}, $c, $self->{properties}) = @$ref;
  $self->{config} = Module::Build::Config->new(values => $c);
  close $fh;
}

sub has_config_data {
  my $self = shift;
  return scalar grep $self->{phash}{$_}->has_data(), qw(config_data features auto_features);
}

sub _write_data {
  my ($self, $filename, $data) = @_;
  
  my $file = $self->config_file($filename);
  my $fh = IO::File->new("> $file") or die "Can't create '$file': $!";
  unless (ref($data)) { # e.g. magicnum
    print $fh $data;
    return;
  }

  print {$fh} Module::Build::Dumper->_data_dump($data);
}

sub write_config {
  my ($self) = @_;
  
  File::Path::mkpath($self->{properties}{config_dir});
  -d $self->{properties}{config_dir} or die "Can't mkdir $self->{properties}{config_dir}: $!";
  
  my @items = @{ $self->prereq_action_types };
  $self->_write_data('prereqs', { map { $_, $self->$_() } @items });
  $self->_write_data('build_params', [$self->{args}, $self->{config}->values_set, $self->{properties}]);

  # Set a new magic number and write it to a file
  $self->_write_data('magicnum', $self->magic_number(int rand 1_000_000));

  $self->{phash}{$_}->write() foreach qw(notes cleanup features auto_features config_data runtime_params);
}

sub check_autofeatures {
  my ($self) = @_;
  my $features = $self->auto_features;
  
  return 1 unless %$features;

  # TODO refactor into ::Util
  my $longest = sub {
    my @str = @_ or croak("no strings given");

    my @len = map({length($_)} @str);
    my $max = 0;
    my $longest;
    for my $i (0..$#len) {
      ($max, $longest) = ($len[$i], $str[$i]) if($len[$i] > $max);
    }
    return($longest);
  };
  my $max_name_len = length($longest->(keys %$features));

  my ($num_disabled, $log_text) = (0, "\nChecking optional features...\n");
  while (my ($name, $info) = each %$features) {
    my $feature_text = " $name" . '.' x ($max_name_len - length($name) + 4);

    my $disabled;
    if ( my $failures = $self->prereq_failures($info) ) {
      $disabled = grep( /^(?:\w+_)?(?:requires|conflicts)$/,
keys %$failures ) ? 1 : 0;
      $feature_text .= $disabled ? "disabled\n" : "enabled\n";
      $num_disabled++ if $disabled;

      while (my ($type, $prereqs) = each %$failures) {
while (my ($module, $status) = each %$prereqs) {
my $required =
($type =~ /^(?:\w+_)?(?:requires|conflicts)$/) ? 1 : 0;
my $prefix = ($required) ? '-' : '*';
$feature_text .= " $prefix $status->{message}\n";
}
      }
    } else {
      $feature_text .= "enabled\n";
    }
    $log_text .= $feature_text if $disabled || $self->verbose;
  }

  # warn user if features disabled
  if ( $num_disabled ) {
    $self->log_warn( $log_text );
    return 0;
  }
  else {
    $self->log_verbose( $log_text );
    return 1;
  }
}

# Automatically detect and add prerequisites based on configuration
sub auto_require {
  my ($self) = @_;
  my $p = $self->{properties};

  # add current Module::Build to configure_requires if there
  # isn't one already specified (but not ourself, so we're not circular)
  if ( $self->dist_name ne 'Module-Build'
    && $self->auto_configure_requires
    && ! exists $p->{configure_requires}{'Module::Build'}
  ) {
    (my $ver = $VERSION) =~ s/^(\d+\.\d\d).*$/$1/; # last major release only
    $self->_add_prereq('configure_requires', 'Module::Build', $ver);
  }

  # If needs_compiler is not explictly set, automatically set it
  # If set, we need ExtUtils::CBuilder (and a compiler)
  my $xs_files = $self->find_xs_files;
  if ( ! defined $p->{needs_compiler} ) {
    $self->needs_compiler( keys %$xs_files || defined $self->c_source );
  }
  if ($self->needs_compiler) {
    $self->_add_prereq('build_requires', 'ExtUtils::CBuilder', 0);
    if ( ! $self->have_c_compiler ) {
      $self->log_warn(<<'EOM');
Warning: ExtUtils::CBuilder not installed or no compiler detected
Proceeding with configuration, but compilation may fail during Build

EOM
    }
  }

  # If using share_dir, require File::ShareDir
  if ( $self->share_dir ) {
    $self->_add_prereq( 'requires', 'File::ShareDir', '1.00' );
  }

  return;
}

sub _add_prereq {
  my ($self, $type, $module, $version) = @_;
  my $p = $self->{properties};
  $version = 0 unless defined $version;
  if ( exists $p->{$type}{$module} ) {
    return if $self->compare_versions( $version, '<=', $p->{$type}{$module} );
  }
  $self->log_verbose("Adding to $type\: $module => $version\n");
  $p->{$type}{$module} = $version;
  return 1;
}
  
sub prereq_failures {
  my ($self, $info) = @_;

  my @types = @{ $self->prereq_action_types };
  $info ||= {map {$_, $self->$_()} @types};

  my $out;

  foreach my $type (@types) {
    my $prereqs = $info->{$type};
    while ( my ($modname, $spec) = each %$prereqs ) {
      my $status = $self->check_installed_status($modname, $spec);

      if ($type =~ /^(?:\w+_)?conflicts$/) {
next if !$status->{ok};
$status->{conflicts} = delete $status->{need};
$status->{message} = "$modname ($status->{have}) conflicts with this distribution";

      } elsif ($type =~ /^(?:\w+_)?recommends$/) {
next if $status->{ok};
$status->{message} = (!ref($status->{have}) && $status->{have} eq '<none>'
? "$modname is not installed"
: "$modname ($status->{have}) is installed, but we prefer to have $spec");
      } else {
next if $status->{ok};
      }

      $out->{$type}{$modname} = $status;
    }
  }

  return $out;
}

# returns a hash of defined prerequisites; i.e. only prereq types with values
sub _enum_prereqs {
  my $self = shift;
  my %prereqs;
  foreach my $type ( @{ $self->prereq_action_types } ) {
    if ( $self->can( $type ) ) {
      my $prereq = $self->$type() || {};
      $prereqs{$type} = $prereq if %$prereq;
    }
  }
  return \%prereqs;
}

sub check_prereq {
  my $self = shift;

  # Check to see if there are any prereqs to check
  my $info = $self->_enum_prereqs;
  return 1 unless $info;

  my $log_text = "Checking prerequisites...\n";

  my $failures = $self->prereq_failures($info);

  if ( $failures ) {
    for my $type ( @{ $self->prereq_action_types } ) {
      my $prereqs = $failures->{$type};
      for my $module ( sort keys %$prereqs ) {
        my $status = $prereqs->{$module};
        my $prefix = ($type =~ /^(?:\w+_)?recommends$/) ? "* $type:" : "! $type:";
        $log_text .= "$prefix $status->{message}\n";
      }
    }

    $self->log_warn( $log_text );
    return 0;

  } else {

    $self->log_verbose($log_text . "Looks good\n\n");
    return 1;

  }
}

sub perl_version {
  my ($self) = @_;
  # Check the current perl interpreter
  # It's much more convenient to use $] here than $^V, but 'man
  # perlvar' says I'm not supposed to. Bloody tyrant.
  return $^V ? $self->perl_version_to_float(sprintf "%vd", $^V) : $];
}

sub perl_version_to_float {
  my ($self, $version) = @_;
  return $version if grep( /\./, $version ) < 2;
  $version =~ s/\./../;
  $version =~ s/\.(\d+)/sprintf '%03d', $1/eg;
  return $version;
}

sub _parse_conditions {
  my ($self, $spec) = @_;

  if ($spec =~ /^\s*([\w.]+)\s*$/) { # A plain number, maybe with dots, letters, and underscores
    return (">= $spec");
  } else {
    return split /\s*,\s*/, $spec;
  }
}

sub check_installed_status {
  my ($self, $modname, $spec) = @_;
  my %status = (need => $spec);
  
  if ($modname eq 'perl') {
    $status{have} = $self->perl_version;
  
  } elsif (eval { no strict; $status{have} = ${"${modname}::VERSION"} }) {
    # Don't try to load if it's already loaded
    
  } else {
    my $pm_info = Module::Build::ModuleInfo->new_from_module( $modname );
    unless (defined( $pm_info )) {
      @status{ qw(have message) } = ('<none>', "$modname is not installed");
      return \%status;
    }
    
    $status{have} = $pm_info->version();
    if ($spec and !defined($status{have})) {
      @status{ qw(have message) } = (undef, "Couldn't find a \$VERSION in prerequisite $modname");
      return \%status;
    }
  }
  
  my @conditions = $self->_parse_conditions($spec);
  
  foreach (@conditions) {
    my ($op, $version) = /^\s* (<=?|>=?|==|!=) \s* ([\w.]+) \s*$/x
      or die "Invalid prerequisite condition '$_' for $modname";
    
    $version = $self->perl_version_to_float($version)
      if $modname eq 'perl';
    
    next if $op eq '>=' and !$version; # Module doesn't have to actually define a $VERSION
    
    unless ($self->compare_versions( $status{have}, $op, $version )) {
      $status{message} = "$modname ($status{have}) is installed, but we need version $op $version";
      return \%status;
    }
  }
  
  $status{ok} = 1;
  return \%status;
}

sub compare_versions {
  my $self = shift;
  my ($v1, $op, $v2) = @_;
  $v1 = Module::Build::Version->new($v1)
    unless UNIVERSAL::isa($v1,'Module::Build::Version');

  my $eval_str = "\$v1 $op \$v2";
  my $result = eval $eval_str;
  $self->log_warn("error comparing versions: '$eval_str' $@") if $@;

  return $result;
}

# I wish I could set $! to a string, but I can't, so I use $@
sub check_installed_version {
  my ($self, $modname, $spec) = @_;
  
  my $status = $self->check_installed_status($modname, $spec);
  
  if ($status->{ok}) {
    return $status->{have} if $status->{have} and "$status->{have}" ne '<none>';
    return '0 but true';
  }
  
  $@ = $status->{message};
  return 0;
}

sub make_executable {
  # Perl's chmod() is mapped to useful things on various non-Unix
  # platforms, so we use it in the base class even though it looks
  # Unixish.

  my $self = shift;
  foreach (@_) {
    my $current_mode = (stat $_)[2];
    chmod $current_mode | oct(111), $_;
  }
}

sub is_executable {
  # We assume this does the right thing on generic platforms, though
  # we do some other more specific stuff on Unixish platforms.
  my ($self, $file) = @_;
  return -x $file;
}

sub _startperl { shift()->config('startperl') }

# Return any directories in @INC which are not in the default @INC for
# this perl. For example, stuff passed in with -I or loaded with "use lib".
sub _added_to_INC {
  my $self = shift;

  my %seen;
  $seen{$_}++ foreach $self->_default_INC;
  return grep !$seen{$_}++, @INC;
}

# Determine the default @INC for this Perl
{
  my @default_inc; # Memoize
  sub _default_INC {
    my $self = shift;
    return @default_inc if @default_inc;
    
    local $ENV{PERL5LIB}; # this is not considered part of the default.
    
    my $perl = ref($self) ? $self->perl : $self->find_perl_interpreter;
    
    my @inc = $self->_backticks($perl, '-le', 'print for @INC');
    chomp @inc;
    
    return @default_inc = @inc;
  }
}

sub print_build_script {
  my ($self, $fh) = @_;
  
  my $build_package = $self->build_class;
  
  my $closedata="";

  my %q = map {$_, $self->$_()} qw(config_dir base_dir);

  my $case_tolerant = 0+(File::Spec->can('case_tolerant')
&& File::Spec->case_tolerant);
  $q{base_dir} = uc $q{base_dir} if $case_tolerant;
  $q{base_dir} = Win32::GetShortPathName($q{base_dir}) if $self->is_windowsish;

  $q{magic_numfile} = $self->config_file('magicnum');

  my @myINC = $self->_added_to_INC;
  for (@myINC, values %q) {
    $_ = File::Spec->canonpath( $_ );
    s/([\\\'])/\\$1/g;
  }

  my $quoted_INC = join ",\n", map " '$_'", @myINC;
  my $shebang = $self->_startperl;
  my $magic_number = $self->magic_number;

  print $fh <<EOF;
$shebang

use strict;
use Cwd;
use File::Basename;
use File::Spec;

sub magic_number_matches {
return 0 unless -e '$q{magic_numfile}';
local *FH;
open FH, '$q{magic_numfile}' or return 0;
my \$filenum = <FH>;
close FH;
return \$filenum == $magic_number;
}

my \$progname;
my \$orig_dir;
BEGIN {
\$^W = 1; # Use warnings
\$progname = basename(\$0);
\$orig_dir = Cwd::cwd();
my \$base_dir = '$q{base_dir}';
if (!magic_number_matches()) {
unless (chdir(\$base_dir)) {
die ("Couldn't chdir(\$base_dir), aborting\\n");
}
unless (magic_number_matches()) {
die ("Configuration seems to be out of date, please re-run 'perl Build.PL' again.\\n");
}
}
unshift \@INC,
(
$quoted_INC
);
}

close(*DATA) unless eof(*DATA); # ensure no open handles to this script

use $build_package;

# Some platforms have problems setting \$^X in shebang contexts, fix it up here
\$^X = Module::Build->find_perl_interpreter;

if (-e 'Build.PL' and not $build_package->up_to_date('Build.PL', \$progname)) {
warn "Warning: Build.PL has been altered. You may need to run 'perl Build.PL' again.\\n";
}

# This should have just enough arguments to be able to bootstrap the rest.
my \$build = $build_package->resume (
properties => {
config_dir => '$q{config_dir}',
orig_dir => \$orig_dir,
},
);

\$build->dispatch;
EOF
}

sub create_build_script {
  my ($self) = @_;
  $self->write_config;
  
  my ($build_script, $dist_name, $dist_version)
    = map $self->$_(), qw(build_script dist_name dist_version);
  
  if ( $self->delete_filetree($build_script) ) {
    $self->log_verbose("Removed previous script '$build_script'\n");
  }

  $self->log_info("Creating new '$build_script' script for ",
"'$dist_name' version '$dist_version'\n");
  my $fh = IO::File->new(">$build_script") or die "Can't create '$build_script': $!";
  $self->print_build_script($fh);
  close $fh;
  
  $self->make_executable($build_script);
  
  my $mymetafile = $self->mymetafile;
  if ( $self->delete_filetree($mymetafile) ) {
    $self->log_verbose("Removed previous '$mymetafile'\n");
  }
  $self->log_info("Creating new '$mymetafile' with configuration results\n");
  if ( $self->write_metafile( $mymetafile, $self->prepare_metadata ) ) {
    $self->add_to_cleanup( $mymetafile );
  }
  
  return 1;
}

sub check_manifest {
  my $self = shift;
  return unless -e 'MANIFEST';
  
  # Stolen nearly verbatim from MakeMaker. But ExtUtils::Manifest
  # could easily be re-written into a modern Perl dialect.

  require ExtUtils::Manifest; # ExtUtils::Manifest is not warnings clean.
  local ($^W, $ExtUtils::Manifest::Quiet) = (0,1);
  
  $self->log_verbose("Checking whether your kit is complete...\n");
  if (my @missed = ExtUtils::Manifest::manicheck()) {
    $self->log_warn("WARNING: the following files are missing in your kit:\n",
"\t", join("\n\t", @missed), "\n",
"Please inform the author.\n\n");
  } else {
    $self->log_verbose("Looks good\n\n");
  }
}

sub dispatch {
  my $self = shift;
  local $self->{_completed_actions} = {};

  if (@_) {
    my ($action, %p) = @_;
    my $args = $p{args} ? delete($p{args}) : {};

    local $self->{invoked_action} = $action;
    local $self->{args} = {%{$self->{args}}, %$args};
    local $self->{properties} = {%{$self->{properties}}, %p};
    return $self->_call_action($action);
  }

  die "No build action specified" unless $self->{action};
  local $self->{invoked_action} = $self->{action};
  $self->_call_action($self->{action});
}

sub _call_action {
  my ($self, $action) = @_;

  return if $self->{_completed_actions}{$action}++;

  local $self->{action} = $action;
  my $method = $self->can_action( $action );
  die "No action '$action' defined, try running the 'help' action.\n" unless $method;
  $self->log_debug("Starting ACTION_$action\n");
  my $rc = $self->$method();
  $self->log_debug("Finished ACTION_$action\n");
  return $rc;
}

sub can_action {
  my ($self, $action) = @_;
  return $self->can( "ACTION_$action" );
}

# cuts the user-specified options out of the command-line args
sub cull_options {
    my $self = shift;
    my (@argv) = @_;

    # XXX is it even valid to call this as a class method?
    return({}, @argv) unless(ref($self)); # no object

    my $specs = $self->get_options;
    return({}, @argv) unless($specs and %$specs); # no user options

    require Getopt::Long;
    # XXX Should we let Getopt::Long handle M::B's options? That would
    # be easy-ish to add to @specs right here, but wouldn't handle options
    # passed without "--" as M::B currently allows. We might be able to
    # get around this by setting the "prefix_pattern" Configure option.
    my @specs;
    my $args = {};
    # Construct the specifications for GetOptions.
    while (my ($k, $v) = each %$specs) {
        # Throw an error if specs conflict with our own.
        die "Option specification '$k' conflicts with a " . ref $self
          . " option of the same name"
          if $self->valid_property($k);
        push @specs, $k . (defined $v->{type} ? $v->{type} : '');
        push @specs, $v->{store} if exists $v->{store};
        $args->{$k} = $v->{default} if exists $v->{default};
    }

    local @ARGV = @argv; # No other way to dupe Getopt::Long

    # Get the options values and return them.
    # XXX Add option to allow users to set options?
    if ( @specs ) {
      Getopt::Long::Configure('pass_through');
      Getopt::Long::GetOptions($args, @specs);
    }

    return $args, @ARGV;
}

sub unparse_args {
  my ($self, $args) = @_;
  my @out;
  while (my ($k, $v) = each %$args) {
    push @out, (UNIVERSAL::isa($v, 'HASH') ? map {+"--$k", "$_=$v->{$_}"} keys %$v :
UNIVERSAL::isa($v, 'ARRAY') ? map {+"--$k", $_} @$v :
("--$k", $v));
  }
  return @out;
}

sub args {
    my $self = shift;
    return wantarray ? %{ $self->{args} } : $self->{args} unless @_;
    my $key = shift;
    $self->{args}{$key} = shift if @_;
    return $self->{args}{$key};
}

# allows select parameters (with underscores) to be spoken with dashes
# when used as command-line options
sub _translate_option {
  my $self = shift;
  my $opt = shift;

  (my $tr_opt = $opt) =~ tr/-/_/;

  return $tr_opt if grep $tr_opt =~ /^(?:no_?)?$_$/, qw(
create_license
create_makefile_pl
create_readme
extra_compiler_flags
extra_linker_flags
html_css
install_base
install_path
meta_add
meta_merge
test_files
use_rcfile
use_tap_harness
tap_harness_args
cpan_client
); # normalize only selected option names

  return $opt;
}

sub _read_arg {
  my ($self, $args, $key, $val) = @_;

  $key = $self->_translate_option($key);

  if ( exists $args->{$key} ) {
    $args->{$key} = [ $args->{$key} ] unless ref $args->{$key};
    push @{$args->{$key}}, $val;
  } else {
    $args->{$key} = $val;
  }
}

# decide whether or not an option requires/has an operand
sub _optional_arg {
  my $self = shift;
  my $opt = shift;
  my $argv = shift;

  $opt = $self->_translate_option($opt);

  my @bool_opts = qw(
build_bat
create_license
create_readme
pollute
quiet
uninst
use_rcfile
verbose
debug
sign
use_tap_harness
);

  # inverted boolean options; eg --noverbose or --no-verbose
  # converted to proper name & returned with false value (verbose, 0)
  if ( grep $opt =~ /^no[-_]?$_$/, @bool_opts ) {
    $opt =~ s/^no-?//;
    return ($opt, 0);
  }

  # non-boolean option; return option unchanged along with its argument
  return ($opt, shift(@$argv)) unless grep $_ eq $opt, @bool_opts;

  # we're punting a bit here, if an option appears followed by a digit
  # we take the digit as the argument for the option. If there is
  # nothing that looks like a digit, we pretend the option is a flag
  # that is being set and has no argument.
  my $arg = 1;
  $arg = shift(@$argv) if @$argv && $argv->[0] =~ /^\d+$/;

  return ($opt, $arg);
}

sub read_args {
  my $self = shift;

  (my $args, @_) = $self->cull_options(@_);
  my %args = %$args;

  my $opt_re = qr/[\w\-]+/;

  my ($action, @argv);
  while (@_) {
    local $_ = shift;
    if ( /^(?:--)?($opt_re)=(.*)$/ ) {
      $self->_read_arg(\%args, $1, $2);
    } elsif ( /^--($opt_re)$/ ) {
      my($opt, $arg) = $self->_optional_arg($1, \@_);
      $self->_read_arg(\%args, $opt, $arg);
    } elsif ( /^($opt_re)$/ and !defined($action)) {
      $action = $1;
    } else {
      push @argv, $_;
    }
  }
  $args{ARGV} = \@argv;

  for ('extra_compiler_flags', 'extra_linker_flags') {
    $args{$_} = [ $self->split_like_shell($args{$_}) ] if exists $args{$_};
  }

  # Convert to arrays
  for ('include_dirs') {
    $args{$_} = [ $args{$_} ] if exists $args{$_} && !ref $args{$_}
  }

  # Hashify these parameters
  for ($self->hash_properties, 'config') {
    next unless exists $args{$_};
    my %hash;
    $args{$_} ||= [];
    $args{$_} = [ $args{$_} ] unless ref $args{$_};
    foreach my $arg ( @{$args{$_}} ) {
      $arg =~ /(\w+)=(.*)/
or die "Malformed '$_' argument: '$arg' should be something like 'foo=bar'";
      $hash{$1} = $2;
    }
    $args{$_} = \%hash;
  }

  # De-tilde-ify any path parameters
  for my $key (qw(prefix install_base destdir)) {
    next if !defined $args{$key};
    $args{$key} = $self->_detildefy($args{$key});
  }

  for my $key (qw(install_path)) {
    next if !defined $args{$key};

    for my $subkey (keys %{$args{$key}}) {
      next if !defined $args{$key}{$subkey};
      my $subkey_ext = $self->_detildefy($args{$key}{$subkey});
      if ( $subkey eq 'html' ) { # translate for compatibility
$args{$key}{binhtml} = $subkey_ext;
$args{$key}{libhtml} = $subkey_ext;
      } else {
$args{$key}{$subkey} = $subkey_ext;
      }
    }
  }

  if ($args{makefile_env_macros}) {
    require Module::Build::Compat;
    %args = (%args, Module::Build::Compat->makefile_to_build_macros);
  }
  
  return \%args, $action;
}

# Default: do nothing. Overridden for Unix & Windows.
sub _detildefy {}


# merge Module::Build argument lists that have already been parsed
# by read_args(). Takes two references to option hashes and merges
# the contents, giving priority to the first.
sub _merge_arglist {
  my( $self, $opts1, $opts2 ) = @_;

  $opts1 ||= {};
  $opts2 ||= {};
  my %new_opts = %$opts1;
  while (my ($key, $val) = each %$opts2) {
    if ( exists( $opts1->{$key} ) ) {
      if ( ref( $val ) eq 'HASH' ) {
        while (my ($k, $v) = each %$val) {
$new_opts{$key}{$k} = $v unless exists( $opts1->{$key}{$k} );
}
      }
    } else {
      $new_opts{$key} = $val
    }
  }

  return %new_opts;
}

# Look for a home directory on various systems.
sub _home_dir {
  my @home_dirs;
  push( @home_dirs, $ENV{HOME} ) if $ENV{HOME};

  push( @home_dirs, File::Spec->catpath($ENV{HOMEDRIVE}, $ENV{HOMEPATH}, '') )
      if $ENV{HOMEDRIVE} && $ENV{HOMEPATH};

  my @other_home_envs = qw( USERPROFILE APPDATA WINDIR SYS$LOGIN );
  push( @home_dirs, map $ENV{$_}, grep $ENV{$_}, @other_home_envs );

  my @real_home_dirs = grep -d, @home_dirs;

  return wantarray ? @real_home_dirs : shift( @real_home_dirs );
}

sub _find_user_config {
  my $self = shift;
  my $file = shift;
  foreach my $dir ( $self->_home_dir ) {
    my $path = File::Spec->catfile( $dir, $file );
    return $path if -e $path;
  }
  return undef;
}

# read ~/.modulebuildrc returning global options '*' and
# options specific to the currently executing $action.
sub read_modulebuildrc {
  my( $self, $action ) = @_;

  return () unless $self->use_rcfile;

  my $modulebuildrc;
  if ( exists($ENV{MODULEBUILDRC}) && $ENV{MODULEBUILDRC} eq 'NONE' ) {
    return ();
  } elsif ( exists($ENV{MODULEBUILDRC}) && -e $ENV{MODULEBUILDRC} ) {
    $modulebuildrc = $ENV{MODULEBUILDRC};
  } elsif ( exists($ENV{MODULEBUILDRC}) ) {
    $self->log_warn("WARNING: Can't find resource file " .
"'$ENV{MODULEBUILDRC}' defined in environment.\n" .
"No options loaded\n");
    return ();
  } else {
    $modulebuildrc = $self->_find_user_config( '.modulebuildrc' );
    return () unless $modulebuildrc;
  }

  my $fh = IO::File->new( $modulebuildrc )
      or die "Can't open $modulebuildrc: $!";

  my %options; my $buffer = '';
  while (defined( my $line = <$fh> )) {
    chomp( $line );
    $line =~ s/#.*$//;
    next unless length( $line );

    if ( $line =~ /^\S/ ) {
      if ( $buffer ) {
my( $action, $options ) = split( /\s+/, $buffer, 2 );
$options{$action} .= $options . ' ';
$buffer = '';
      }
      $buffer = $line;
    } else {
      $buffer .= $line;
    }
  }

  if ( $buffer ) { # anything left in $buffer ?
    my( $action, $options ) = split( /\s+/, $buffer, 2 );
    $options{$action} .= $options . ' '; # merge if more than one line
  }

  my ($global_opts) =
    $self->read_args( $self->split_like_shell( $options{'*'} || '' ) );
  my ($action_opts) =
    $self->read_args( $self->split_like_shell( $options{$action} || '' ) );

  # specific $action options take priority over global options '*'
  return $self->_merge_arglist( $action_opts, $global_opts );
}

# merge the relevant options in ~/.modulebuildrc into Module::Build's
# option list where they do not conflict with commandline options.
sub merge_modulebuildrc {
  my( $self, $action, %cmdline_opts ) = @_;
  my %rc_opts = $self->read_modulebuildrc( $action || $self->{action} || 'build' );
  my %new_opts = $self->_merge_arglist( \%cmdline_opts, \%rc_opts );
  $self->merge_args( $action, %new_opts );
}

sub merge_args {
  my ($self, $action, %args) = @_;
  $self->{action} = $action if defined $action;

  my %additive = map { $_ => 1 } $self->hash_properties;

  # Extract our 'properties' from $cmd_args, the rest are put in 'args'.
  while (my ($key, $val) = each %args) {
    $self->{phash}{runtime_params}->access( $key => $val )
      if $self->valid_property($key);

    if ($key eq 'config') {
      $self->config($_ => $val->{$_}) foreach keys %$val;
    } else {
      my $add_to = $additive{$key} ? $self->{properties}{$key} :
                   $self->valid_property($key) ? $self->{properties} :
                   $self->{args} ;

      if ($additive{$key}) {
$add_to->{$_} = $val->{$_} foreach keys %$val;
      } else {
$add_to->{$key} = $val;
      }
    }
  }
}

sub cull_args {
  my $self = shift;
  my ($args, $action) = $self->read_args(@_);
  $self->merge_args($action, %$args);
  $self->merge_modulebuildrc( $action, %$args );
}

sub super_classes {
  my ($self, $class, $seen) = @_;
  $class ||= ref($self) || $self;
  $seen ||= {};
  
  no strict 'refs';
  my @super = grep {not $seen->{$_}++} $class, @{ $class . '::ISA' };
  return @super, map {$self->super_classes($_,$seen)} @super;
}

sub known_actions {
  my ($self) = @_;

  my %actions;
  no strict 'refs';
  
  foreach my $class ($self->super_classes) {
    foreach ( keys %{ $class . '::' } ) {
      $actions{$1}++ if /^ACTION_(\w+)/;
    }
  }

  return wantarray ? sort keys %actions : \%actions;
}

sub get_action_docs {
  my ($self, $action) = @_;
  my $actions = $self->known_actions;
  die "No known action '$action'" unless $actions->{$action};

  my ($files_found, @docs) = (0);
  foreach my $class ($self->super_classes) {
    (my $file = $class) =~ s{::}{/}g;
    # NOTE: silently skipping relative paths if any chdir() happened
    $file = $INC{$file . '.pm'} or next;
    my $fh = IO::File->new("< $file") or next;
    $files_found++;

    # Code below modified from /usr/bin/perldoc

    # Skip to ACTIONS section
    local $_;
    while (<$fh>) {
      last if /^=head1 ACTIONS\s/;
    }

    # Look for our action and determine the style
    my $style;
    while (<$fh>) {
      last if /^=head1 /;

      # only item and head2 are allowed (3&4 are not in 5.005)
      if(/^=(item|head2)\s+\Q$action\E\b/) {
        $style = $1;
        push @docs, $_;
        last;
      }
    }
    $style or next; # not here

    # and the content
    if($style eq 'item') {
      my ($found, $inlist) = (0, 0);
      while (<$fh>) {
        if (/^=(item|back)/) {
          last unless $inlist;
        }
        push @docs, $_;
        ++$inlist if /^=over/;
        --$inlist if /^=back/;
      }
    }
    else { # head2 style
      # stop at anything equal or greater than the found level
      while (<$fh>) {
        last if(/^=(?:head[12]|cut)/);
        push @docs, $_;
      }
    }
    # TODO maybe disallow overriding just pod for an action
    # TODO and possibly: @docs and last;
  }

  unless ($files_found) {
    $@ = "Couldn't find any documentation to search";
    return;
  }
  unless (@docs) {
    $@ = "Couldn't find any docs for action '$action'";
    return;
  }
  
  return join '', @docs;
}

sub ACTION_prereq_report {
  my $self = shift;
  $self->log_info( $self->prereq_report );
}

sub ACTION_prereq_data {
  my $self = shift;
  $self->log_info( Module::Build::Dumper->_data_dump( $self->prereq_data ) );
}

sub prereq_data {
  my $self = shift;
  my @types = ('configure_requires', @{ $self->prereq_action_types } );
  my $info = { map { $_ => $self->$_() } grep { %{$self->$_()} } @types };
  return $info;
}

sub prereq_report {
  my $self = shift;
  my $info = $self->prereq_data;

  my $output = '';
  foreach my $type (keys %$info) {
    my $prereqs = $info->{$type};
    $output .= "\n$type:\n";
    my $mod_len = 2;
    my $ver_len = 4;
    my %mods;
    while ( my ($modname, $spec) = each %$prereqs ) {
      my $len = length $modname;
      $mod_len = $len if $len > $mod_len;
      $spec ||= '0';
      $len = length $spec;
      $ver_len = $len if $len > $ver_len;

      my $mod = $self->check_installed_status($modname, $spec);
      $mod->{name} = $modname;
      $mod->{ok} ||= 0;
      $mod->{ok} = ! $mod->{ok} if $type =~ /^(\w+_)?conflicts$/;

      $mods{lc $modname} = $mod;
    }

    my $space = q{ } x ($mod_len - 3);
    my $vspace = q{ } x ($ver_len - 3);
    my $sline = q{-} x ($mod_len - 3);
    my $vline = q{-} x ($ver_len - 3);
    my $disposition = ($type =~ /^(\w+_)?conflicts$/) ?
                        'Clash' : 'Need';
    $output .=
      " Module $space $disposition $vspace Have\n".
      " ------$sline+------$vline-+----------\n";


    for my $k (sort keys %mods) {
      my $mod = $mods{$k};
      my $space = q{ } x ($mod_len - length $k);
      my $vspace = q{ } x ($ver_len - length $mod->{need});
      my $f = $mod->{ok} ? ' ' : '!';
      $output .=
        " $f $mod->{name} $space $mod->{need} $vspace ".
        (defined($mod->{have}) ? $mod->{have} : "")."\n";
    }
  }
  return $output;
}

sub ACTION_help {
  my ($self) = @_;
  my $actions = $self->known_actions;
  
  if (@{$self->{args}{ARGV}}) {
    my $msg = eval {$self->get_action_docs($self->{args}{ARGV}[0], $actions)};
    print $@ ? "$@\n" : $msg;
    return;
  }

  print <<EOF;

Usage: $0 <action> arg1=value arg2=value ...
Example: $0 test verbose=1
Actions defined:
EOF
  
  print $self->_action_listing($actions);

  print "\nRun `Build help <action>` for details on an individual action.\n";
  print "See `perldoc Module::Build` for complete documentation.\n";
}

sub _action_listing {
  my ($self, $actions) = @_;

  # Flow down columns, not across rows
  my @actions = sort keys %$actions;
  @actions = map $actions[($_ + ($_ % 2) * @actions) / 2], 0..$#actions;
  
  my $out = '';
  while (my ($one, $two) = splice @actions, 0, 2) {
    $out .= sprintf(" %-12s %-12s\n", $one, $two||'');
  }
  return $out;
}

sub ACTION_retest {
  my ($self) = @_;
  
  # Protect others against our @INC changes
  local @INC = @INC;

  # Filter out nonsensical @INC entries - some versions of
  # Test::Harness will really explode the number of entries here
  @INC = grep {ref() || -d} @INC if @INC > 100;

  $self->do_tests;
}

sub ACTION_testall {
  my ($self) = @_;

  my @types;
  for my $action (grep { $_ ne 'all' } $self->get_test_types) {
    # XXX We can't just dispatch because we get multiple summaries but
    # we'll need to dispatch to support custom setup/teardown in the
    # action. To support that, we'll need to call something besides
    # Harness::runtests() because we'll need to collect the results in
    # parts, then run the summary.
    push(@types, $action);
    #$self->_call_action( "test$action" );
  }
  $self->generic_test(types => ['default', @types]);
}

sub get_test_types {
  my ($self) = @_;

  my $t = $self->{properties}->{test_types};
  return ( defined $t ? ( keys %$t ) : () );
}


sub ACTION_test {
  my ($self) = @_;
  $self->generic_test(type => 'default');
}

sub generic_test {
  my $self = shift;
  (@_ % 2) and croak('Odd number of elements in argument hash');
  my %args = @_;

  my $p = $self->{properties};

  my @types = (
    (exists($args{type}) ? $args{type} : ()),
    (exists($args{types}) ? @{$args{types}} : ()),
  );
  @types or croak "need some types of tests to check";

  my %test_types = (
    default => $p->{test_file_exts},
    (defined($p->{test_types}) ? %{$p->{test_types}} : ()),
  );

  for my $type (@types) {
    croak "$type not defined in test_types!"
      unless defined $test_types{ $type };
  }

  # we use local here because it ends up two method calls deep
  local $p->{test_file_exts} = [ map { ref $_ ? @$_ : $_ } @test_types{@types} ];
  $self->depends_on('code');

  # Protect others against our @INC changes
  local @INC = @INC;

  # Make sure we test the module in blib/
  unshift @INC, (File::Spec->catdir($p->{base_dir}, $self->blib, 'lib'),
File::Spec->catdir($p->{base_dir}, $self->blib, 'arch'));

  # Filter out nonsensical @INC entries - some versions of
  # Test::Harness will really explode the number of entries here
  @INC = grep {ref() || -d} @INC if @INC > 100;

  $self->do_tests;
}

# Test::Harness dies on failure but TAP::Harness does not, so we must
# die if running under TAP::Harness
sub do_tests {
  my $self = shift;

  my $tests = $self->find_test_files;

  if(@$tests) {
    my $args = $self->tap_harness_args;
    if($self->use_tap_harness or ($args and %$args)) {
      my $aggregate = $self->run_tap_harness($tests);
      if ( $aggregate->has_errors ) {
        die "Errors in testing. Cannot continue.\n";
      }
    }
    else {
      $self->run_test_harness($tests);
    }
  }
  else {
    $self->log_info("No tests defined.\n");
  }

  $self->run_visual_script;
}

sub run_tap_harness {
  my ($self, $tests) = @_;

  require TAP::Harness;

  # TODO allow the test @INC to be set via our API?

  my $aggregate = TAP::Harness->new({
    lib => [@INC],
    verbosity => $self->{properties}{verbose},
    switches => [ $self->harness_switches ],
    %{ $self->tap_harness_args },
  })->runtests(@$tests);

  return $aggregate;
}

sub run_test_harness {
    my ($self, $tests) = @_;
    require Test::Harness;
    my $p = $self->{properties};
    my @harness_switches = $self->harness_switches;

    # Work around a Test::Harness bug that loses the particular perl
    # we're running under. $self->perl is trustworthy, but $^X isn't.
    local $^X = $self->perl;

    # Do everything in our power to work with all versions of Test::Harness
    local $Test::Harness::switches = join ' ', grep defined, $Test::Harness::switches, @harness_switches;
    local $Test::Harness::Switches = join ' ', grep defined, $Test::Harness::Switches, @harness_switches;
    local $ENV{HARNESS_PERL_SWITCHES} = join ' ', grep defined, $ENV{HARNESS_PERL_SWITCHES}, @harness_switches;

    $Test::Harness::switches = undef unless length $Test::Harness::switches;
    $Test::Harness::Switches = undef unless length $Test::Harness::Switches;
    delete $ENV{HARNESS_PERL_SWITCHES} unless length $ENV{HARNESS_PERL_SWITCHES};

    local ($Test::Harness::verbose,
           $Test::Harness::Verbose,
           $ENV{TEST_VERBOSE},
           $ENV{HARNESS_VERBOSE}) = ($p->{verbose} || 0) x 4;

    Test::Harness::runtests(@$tests);
}

sub run_visual_script {
    my $self = shift;
    # This will get run and the user will see the output. It doesn't
    # emit Test::Harness-style output.
    $self->run_perl_script('visual.pl', '-Mblib='.$self->blib)
        if -e 'visual.pl';
}

sub harness_switches {
    shift->{properties}{debugger} ? qw(-w -d) : ();
}

sub test_files {
  my $self = shift;
  my $p = $self->{properties};
  if (@_) {
    return $p->{test_files} = (@_ == 1 ? shift : [@_]);
  }
  return $self->find_test_files;
}

sub expand_test_dir {
  my ($self, $dir) = @_;
  my $exts = $self->{properties}{test_file_exts};

  return sort map { @{$self->rscan_dir($dir, qr{^[^.].*\Q$_\E$})} } @$exts
    if $self->recursive_test_files;

  return sort map { glob File::Spec->catfile($dir, "*$_") } @$exts;
}

sub ACTION_testdb {
  my ($self) = @_;
  local $self->{properties}{debugger} = 1;
  $self->depends_on('test');
}

sub ACTION_testcover {
  my ($self) = @_;

  unless (Module::Build::ModuleInfo->find_module_by_name('Devel::Cover')) {
    warn("Cannot run testcover action unless Devel::Cover is installed.\n");
    return;
  }

  $self->add_to_cleanup('coverage', 'cover_db');
  $self->depends_on('code');

  # See whether any of the *.pm files have changed since last time
  # testcover was run. If so, start over.
  if (-e 'cover_db') {
    my $pm_files = $self->rscan_dir
        (File::Spec->catdir($self->blib, 'lib'), file_qr('\.pm$') );
    my $cover_files = $self->rscan_dir('cover_db', sub {-f $_ and not /\.html$/});
    
    $self->do_system(qw(cover -delete))
      unless $self->up_to_date($pm_files, $cover_files)
&& $self->up_to_date($self->test_files, $cover_files);
  }

  local $Test::Harness::switches =
  local $Test::Harness::Switches =
  local $ENV{HARNESS_PERL_SWITCHES} = "-MDevel::Cover";

  $self->depends_on('test');
  $self->do_system('cover');
}

sub ACTION_code {
  my ($self) = @_;
  
  # All installable stuff gets created in blib/ .
  # Create blib/arch to keep blib.pm happy
  my $blib = $self->blib;
  $self->add_to_cleanup($blib);
  File::Path::mkpath( File::Spec->catdir($blib, 'arch') );
  
  if (my $split = $self->autosplit) {
    $self->autosplit_file($_, $blib) for ref($split) ? @$split : ($split);
  }
  
  foreach my $element (@{$self->build_elements}) {
    my $method = "process_${element}_files";
    $method = "process_files_by_extension" unless $self->can($method);
    $self->$method($element);
  }

  $self->depends_on('config_data');
}

sub ACTION_build {
  my $self = shift;
  $self->depends_on('code');
  $self->depends_on('docs');
}

sub process_files_by_extension {
  my ($self, $ext) = @_;
  
  my $method = "find_${ext}_files";
  my $files = $self->can($method) ? $self->$method() : $self->_find_file_by_type($ext, 'lib');
  
  while (my ($file, $dest) = each %$files) {
    $self->copy_if_modified(from => $file, to => File::Spec->catfile($self->blib, $dest) );
  }
}

sub process_support_files {
  my $self = shift;
  my $p = $self->{properties};
  return unless $p->{c_source};
  
  push @{$p->{include_dirs}}, $p->{c_source};
  
  my $files = $self->rscan_dir($p->{c_source}, file_qr('\.c(c|p|pp|xx|\+\+)?$'));
  foreach my $file (@$files) {
    push @{$p->{objects}}, $self->compile_c($file);
  }
}

sub process_share_dir_files {
  my $self = shift;
  my $files = $self->_find_share_dir_files;
  return unless $files;

  # root for all File::ShareDir paths
  my $share_prefix = File::Spec->catdir($self->blib, qw/lib auto share/);

  # copy all share files to blib
  while (my ($file, $dest) = each %$files) {
    $self->copy_if_modified(
      from => $file, to => File::Spec->catfile( $share_prefix, $dest )
    );
  }
}

sub _find_share_dir_files {
  my $self = shift;
  my $share_dir = $self->share_dir;
  return unless $share_dir;
  
  my @file_map;
  if ( $share_dir->{dist} ) {
    my $prefix = File::Spec->catdir( "dist", $self->dist_name );
    push @file_map, $self->_share_dir_map( $prefix, $share_dir->{dist} );
  }

  if ( $share_dir->{module} ) {
    for my $mod ( keys %{ $share_dir->{module} } ) {
      (my $altmod = $mod) =~ s{::}{-}g;
      my $prefix = File::Spec->catdir("module", $altmod);
      push @file_map, $self->_share_dir_map($prefix, $share_dir->{module}{$mod});
    }
  }

  return { @file_map };
}

sub _share_dir_map {
  my ($self, $prefix, $list) = @_;
  my %files;
  for my $dir ( @$list ) {
    for my $f ( @{ $self->rscan_dir( $dir, sub {-f} )} ) {
      $files{File::Spec->canonpath($f)} = File::Spec->catfile(
        $prefix, File::Spec->abs2rel( $f, $dir )
      );
    }
  }
  return %files;
}

sub process_PL_files {
  my ($self) = @_;
  my $files = $self->find_PL_files;
  
  while (my ($file, $to) = each %$files) {
    unless ($self->up_to_date( $file, $to )) {
      $self->run_perl_script($file, [], [@$to]) or die "$file failed";
      $self->add_to_cleanup(@$to);
    }
  }
}

sub process_xs_files {
  my $self = shift;
  my $files = $self->find_xs_files;
  while (my ($from, $to) = each %$files) {
    unless ($from eq $to) {
      $self->add_to_cleanup($to);
      $self->copy_if_modified( from => $from, to => $to );
    }
    $self->process_xs($to);
  }
}

sub process_pod_files { shift()->process_files_by_extension(shift()) }
sub process_pm_files { shift()->process_files_by_extension(shift()) }

sub process_script_files {
  my $self = shift;
  my $files = $self->find_script_files;
  return unless keys %$files;

  my $script_dir = File::Spec->catdir($self->blib, 'script');
  File::Path::mkpath( $script_dir );
  
  foreach my $file (keys %$files) {
    my $result = $self->copy_if_modified($file, $script_dir, 'flatten') or next;
    $self->fix_shebang_line($result) unless $self->is_vmsish;
    $self->make_executable($result);
  }
}

sub find_PL_files {
  my $self = shift;
  if (my $files = $self->{properties}{PL_files}) {
    # 'PL_files' is given as a Unix file spec, so we localize_file_path().
    
    if (UNIVERSAL::isa($files, 'ARRAY')) {
      return { map {$_, [/^(.*)\.PL$/]}
map $self->localize_file_path($_),
@$files };

    } elsif (UNIVERSAL::isa($files, 'HASH')) {
      my %out;
      while (my ($file, $to) = each %$files) {
$out{ $self->localize_file_path($file) } = [ map $self->localize_file_path($_),
ref $to ? @$to : ($to) ];
      }
      return \%out;

    } else {
      die "'PL_files' must be a hash reference or array reference";
    }
  }
  
  return unless -d 'lib';
  return { map {$_, [/^(.*)\.PL$/i ]} @{ $self->rscan_dir('lib',
                                                          file_qr('\.PL$')) } };
}

sub find_pm_files { shift->_find_file_by_type('pm', 'lib') }
sub find_pod_files { shift->_find_file_by_type('pod', 'lib') }
sub find_xs_files { shift->_find_file_by_type('xs', 'lib') }

sub find_script_files {
  my $self = shift;
  if (my $files = $self->script_files) {
    # Always given as a Unix file spec. Values in the hash are
    # meaningless, but we preserve if present.
    return { map {$self->localize_file_path($_), $files->{$_}} keys %$files };
  }
  
  # No default location for script files
  return {};
}

sub find_test_files {
  my $self = shift;
  my $p = $self->{properties};

  if (my $files = $p->{test_files}) {
    $files = [keys %$files] if UNIVERSAL::isa($files, 'HASH');
    $files = [map { -d $_ ? $self->expand_test_dir($_) : $_ }
map glob,
$self->split_like_shell($files)];
    
    # Always given as a Unix file spec.
    return [ map $self->localize_file_path($_), @$files ];
    
  } else {
    # Find all possible tests in t/ or test.pl
    my @tests;
    push @tests, 'test.pl' if -e 'test.pl';
    push @tests, $self->expand_test_dir('t') if -e 't' and -d _;
    return \@tests;
  }
}

sub _find_file_by_type {
  my ($self, $type, $dir) = @_;
  
  if (my $files = $self->{properties}{"${type}_files"}) {
    # Always given as a Unix file spec
    return { map $self->localize_file_path($_), %$files };
  }
  
  return {} unless -d $dir;
  return { map {$_, $_}
map $self->localize_file_path($_),
grep !/\.\#/,
@{ $self->rscan_dir($dir, file_qr("\\.$type\$")) } };
}

sub localize_file_path {
  my ($self, $path) = @_;
  return File::Spec->catfile( split m{/}, $path );
}

sub localize_dir_path {
  my ($self, $path) = @_;
  return File::Spec->catdir( split m{/}, $path );
}

sub fix_shebang_line { # Adapted from fixin() in ExtUtils::MM_Unix 1.35
  my ($self, @files) = @_;
  my $c = ref($self) ? $self->{config} : 'Module::Build::Config';
  
  my ($does_shbang) = $c->get('sharpbang') =~ /^\s*\#\!/;
  for my $file (@files) {
    my $FIXIN = IO::File->new($file) or die "Can't process '$file': $!";
    local $/ = "\n";
    chomp(my $line = <$FIXIN>);
    next unless $line =~ s/^\s*\#!\s*//; # Not a shbang file.
    
    my ($cmd, $arg) = (split(' ', $line, 2), '');
    next unless $cmd =~ /perl/i;
    my $interpreter = $self->{properties}{perl};
    
    $self->log_verbose("Changing sharpbang in $file to $interpreter");
    my $shb = '';
    $shb .= $c->get('sharpbang')."$interpreter $arg\n" if $does_shbang;
    
    # I'm not smart enough to know the ramifications of changing the
    # embedded newlines here to \n, so I leave 'em in.
    $shb .= qq{
eval 'exec $interpreter $arg -S \$0 \${1+"\$\@"}'
if 0; # not running under some shell
} unless $self->is_windowsish; # this won't work on win32, so don't
    
    my $FIXOUT = IO::File->new(">$file.new")
      or die "Can't create new $file: $!\n";
    
    # Print out the new #! line (or equivalent).
    local $\;
    undef $/; # Was localized above
    print $FIXOUT $shb, <$FIXIN>;
    close $FIXIN;
    close $FIXOUT;
    
    rename($file, "$file.bak")
      or die "Can't rename $file to $file.bak: $!";
    
    rename("$file.new", $file)
      or die "Can't rename $file.new to $file: $!";
    
    $self->delete_filetree("$file.bak")
      or $self->log_warn("Couldn't clean up $file.bak, leaving it there");
    
    $self->do_system($c->get('eunicefix'), $file) if $c->get('eunicefix') ne ':';
  }
}


sub ACTION_testpod {
  my $self = shift;
  $self->depends_on('docs');
  
  eval q{use Test::Pod 0.95; 1}
    or die "The 'testpod' action requires Test::Pod version 0.95";

  my @files = sort keys %{$self->_find_pods($self->libdoc_dirs)},
                   keys %{$self->_find_pods
                             ($self->bindoc_dirs,
                              exclude => [ file_qr('\.bat$') ])}
    or die "Couldn't find any POD files to test\n";

  { package # hide from PAUSE
      Module::Build::PodTester; # Don't want to pollute the main namespace
    Test::Pod->import( tests => scalar @files );
    pod_file_ok($_) foreach @files;
  }
}

sub ACTION_testpodcoverage {
  my $self = shift;

  $self->depends_on('docs');
  
  eval q{use Test::Pod::Coverage 1.00; 1}
    or die "The 'testpodcoverage' action requires ",
           "Test::Pod::Coverage version 1.00";

  # TODO this needs test coverage!

  # XXX work-around a bug in Test::Pod::Coverage previous to v1.09
  # Make sure we test the module in blib/
  local @INC = @INC;
  my $p = $self->{properties};
  unshift(@INC,
    # XXX any reason to include arch?
    File::Spec->catdir($p->{base_dir}, $self->blib, 'lib'),
    #File::Spec->catdir($p->{base_dir}, $self->blib, 'arch')
  );

  all_pod_coverage_ok();
}

sub ACTION_docs {
  my $self = shift;

  $self->depends_on('code');
  $self->depends_on('manpages', 'html');
}

# Given a file type, will return true if the file type would normally
# be installed when neither install-base nor prefix has been set.
# I.e. it will be true only if the path is set from Config.pm or
# set explicitly by the user via install-path.
sub _is_default_installable {
  my $self = shift;
  my $type = shift;
  return ( $self->install_destination($type) &&
           ( $self->install_path($type) ||
$self->install_sets($self->installdirs)->{$type} )
) ? 1 : 0;
}

sub ACTION_manpages {
  my $self = shift;

  return unless $self->_mb_feature('manpage_support');

  $self->depends_on('code');

  foreach my $type ( qw(bin lib) ) {
    my $files = $self->_find_pods( $self->{properties}{"${type}doc_dirs"},
                                   exclude => [ file_qr('\.bat$') ] );
    next unless %$files;

    my $sub = $self->can("manify_${type}_pods");
    next unless defined( $sub );

    if ( $self->invoked_action eq 'manpages' ) {
      $self->$sub();
    } elsif ( $self->_is_default_installable("${type}doc") ) {
      $self->$sub();
    }
  }

}

sub manify_bin_pods {
  my $self = shift;

  my $files = $self->_find_pods( $self->{properties}{bindoc_dirs},
                                   exclude => [ file_qr('\.bat$') ] );
  return unless keys %$files;

  my $mandir = File::Spec->catdir( $self->blib, 'bindoc' );
  File::Path::mkpath( $mandir, 0, oct(777) );

  require Pod::Man;
  foreach my $file (keys %$files) {
    # Pod::Simple based parsers only support one document per instance.
    # This is expected to change in a future version (Pod::Simple > 3.03).
    my $parser = Pod::Man->new( section => 1 ); # binaries go in section 1
    my $manpage = $self->man1page_name( $file ) . '.' .
$self->config( 'man1ext' );
    my $outfile = File::Spec->catfile($mandir, $manpage);
    next if $self->up_to_date( $file, $outfile );
    $self->log_verbose("Manifying $file -> $outfile\n");
    eval { $parser->parse_from_file( $file, $outfile ); 1 }
      or $self->log_warn("Error creating '$outfile': $@\n");
    $files->{$file} = $outfile;
  }
}

sub manify_lib_pods {
  my $self = shift;

  my $files = $self->_find_pods($self->{properties}{libdoc_dirs});
  return unless keys %$files;

  my $mandir = File::Spec->catdir( $self->blib, 'libdoc' );
  File::Path::mkpath( $mandir, 0, oct(777) );

  require Pod::Man;
  while (my ($file, $relfile) = each %$files) {
    # Pod::Simple based parsers only support one document per instance.
    # This is expected to change in a future version (Pod::Simple > 3.03).
    my $parser = Pod::Man->new( section => 3 ); # libraries go in section 3
    my $manpage = $self->man3page_name( $relfile ) . '.' .
$self->config( 'man3ext' );
    my $outfile = File::Spec->catfile( $mandir, $manpage);
    next if $self->up_to_date( $file, $outfile );
    $self->log_verbose("Manifying $file -> $outfile\n");
    eval { $parser->parse_from_file( $file, $outfile ); 1 }
      or $self->log_warn("Error creating '$outfile': $@\n");
    $files->{$file} = $outfile;
  }
}

sub _find_pods {
  my ($self, $dirs, %args) = @_;
  my %files;
  foreach my $spec (@$dirs) {
    my $dir = $self->localize_dir_path($spec);
    next unless -e $dir;

    FILE: foreach my $file ( @{ $self->rscan_dir( $dir ) } ) {
      foreach my $regexp ( @{ $args{exclude} } ) {
next FILE if $file =~ $regexp;
      }
      $files{$file} = File::Spec->abs2rel($file, $dir) if $self->contains_pod( $file )
    }
  }
  return \%files;
}

sub contains_pod {
  my ($self, $file) = @_;
  return '' unless -T $file; # Only look at text files
  
  my $fh = IO::File->new( $file ) or die "Can't open $file: $!";
  while (my $line = <$fh>) {
    return 1 if $line =~ /^\=(?:head|pod|item)/;
  }
  
  return '';
}

sub ACTION_html {
  my $self = shift;

  return unless $self->_mb_feature('HTML_support');

  $self->depends_on('code');

  foreach my $type ( qw(bin lib) ) {
    my $files = $self->_find_pods( $self->{properties}{"${type}doc_dirs"},
exclude =>
                                        [ file_qr('\.(?:bat|com|html)$') ] );
    next unless %$files;

    if ( $self->invoked_action eq 'html' ) {
      $self->htmlify_pods( $type );
    } elsif ( $self->_is_default_installable("${type}html") ) {
      $self->htmlify_pods( $type );
    }
  }

}


# 1) If it's an ActiveState perl install, we need to run
# ActivePerl::DocTools->UpdateTOC;
# 2) Links to other modules are not being generated
sub htmlify_pods {
  my $self = shift;
  my $type = shift;
  my $htmldir = shift || File::Spec->catdir($self->blib, "${type}html");

  require Module::Build::PodParser;
  require Pod::Html;

  $self->add_to_cleanup('pod2htm*');

  my $pods = $self->_find_pods( $self->{properties}{"${type}doc_dirs"},
                                exclude => [ file_qr('\.(?:bat|com|html)$') ] );
  return unless %$pods; # nothing to do

  unless ( -d $htmldir ) {
    File::Path::mkpath($htmldir, 0, oct(755))
      or die "Couldn't mkdir $htmldir: $!";
  }

  my @rootdirs = ($type eq 'bin') ? qw(bin) :
      $self->installdirs eq 'core' ? qw(lib) : qw(site lib);

  my $podpath = join ':',
                map $_->[1],
                grep -e $_->[0],
                map [File::Spec->catdir($self->blib, $_), $_],
                qw( script lib );

  foreach my $pod ( keys %$pods ) {

    my ($name, $path) = File::Basename::fileparse($pods->{$pod},
                                                 file_qr('\.(?:pm|plx?|pod)$'));
    my @dirs = File::Spec->splitdir( File::Spec->canonpath( $path ) );
    pop( @dirs ) if scalar(@dirs) && $dirs[-1] eq File::Spec->curdir;

    my $fulldir = File::Spec->catfile($htmldir, @rootdirs, @dirs);
    my $outfile = File::Spec->catfile($fulldir, "${name}.html");
    my $infile = File::Spec->abs2rel($pod);

    next if $self->up_to_date($infile, $outfile);

    unless ( -d $fulldir ){
      File::Path::mkpath($fulldir, 0, oct(755))
        or die "Couldn't mkdir $fulldir: $!";
    }

    my $path2root = join( '/', ('..') x (@rootdirs+@dirs) );
    my $htmlroot = join( '/',
($path2root,
$self->installdirs eq 'core' ? () : qw(site) ) );

    my $fh = IO::File->new($infile) or die "Can't read $infile: $!";
    my $abstract = Module::Build::PodParser->new(fh => $fh)->get_abstract();

    my $title = join( '::', (@dirs, $name) );
    $title .= " - $abstract" if $abstract;

    my @opts = (
                '--flush',
                "--title=$title",
                "--podpath=$podpath",
                "--infile=$infile",
                "--outfile=$outfile",
                '--podroot=' . $self->blib,
                "--htmlroot=$htmlroot",
               );

    if ( eval{Pod::Html->VERSION(1.03)} ) {
      push( @opts, ('--header', '--backlink=Back to Top') );
      push( @opts, "--css=$path2root/" . $self->html_css) if $self->html_css;
    }

    $self->log_verbose("HTMLifying $infile -> $outfile\n");
    $self->log_verbose("pod2html @opts\n");
    eval { Pod::Html::pod2html(@opts); 1 }
      or $self->log_warn("pod2html @opts failed: $@");
  }

}

# Adapted from ExtUtils::MM_Unix
sub man1page_name {
  my $self = shift;
  return File::Basename::basename( shift );
}

# Adapted from ExtUtils::MM_Unix and Pod::Man
# Depending on M::B's dependency policy, it might make more sense to refactor
# Pod::Man::begin_pod() to extract a name() methods, and use them...
# -spurkis
sub man3page_name {
  my $self = shift;
  my ($vol, $dirs, $file) = File::Spec->splitpath( shift );
  my @dirs = File::Spec->splitdir( File::Spec->canonpath($dirs) );
  
  # Remove known exts from the base name
  $file =~ s/\.p(?:od|m|l)\z//i;
  
  return join( $self->manpage_separator, @dirs, $file );
}

sub manpage_separator {
  return '::';
}

# For systems that don't have 'diff' executable, should use Algorithm::Diff
sub ACTION_diff {
  my $self = shift;
  $self->depends_on('build');
  my $local_lib = File::Spec->rel2abs('lib');
  my @myINC = grep {$_ ne $local_lib} @INC;

  # The actual install destination might not be in @INC, so check there too.
  push @myINC, map $self->install_destination($_), qw(lib arch);

  my @flags = @{$self->{args}{ARGV}};
  @flags = $self->split_like_shell($self->{args}{flags} || '') unless @flags;
  
  my $installmap = $self->install_map;
  delete $installmap->{read};
  delete $installmap->{write};

  my $text_suffix = file_qr('\.(pm|pod)$');

  while (my $localdir = each %$installmap) {
    my @localparts = File::Spec->splitdir($localdir);
    my $files = $self->rscan_dir($localdir, sub {-f});
    
    foreach my $file (@$files) {
      my @parts = File::Spec->splitdir($file);
      @parts = @parts[@localparts .. $#parts]; # Get rid of blib/lib or similar
      
      my $installed = Module::Build::ModuleInfo->find_module_by_name(
                        join('::', @parts), \@myINC );
      if (not $installed) {
print "Only in lib: $file\n";
next;
      }
      
      my $status = File::Compare::compare($installed, $file);
      next if $status == 0; # Files are the same
      die "Can't compare $installed and $file: $!" if $status == -1;
      
      if ($file =~ $text_suffix) {
$self->do_system('diff', @flags, $installed, $file);
      } else {
print "Binary files $file and $installed differ\n";
      }
    }
  }
}

sub ACTION_pure_install {
  shift()->depends_on('install');
}

sub ACTION_install {
  my ($self) = @_;
  require ExtUtils::Install;
  $self->depends_on('build');
  ExtUtils::Install::install($self->install_map, !$self->quiet, 0, $self->{args}{uninst}||0);
}

sub ACTION_fakeinstall {
  my ($self) = @_;
  require ExtUtils::Install;
  my $eui_version = ExtUtils::Install->VERSION;
  if ( $eui_version < 1.32 ) {
    $self->log_warn(
      "The 'fakeinstall' action requires Extutils::Install 1.32 or later.\n"
      . "(You only have version $eui_version)."
    );
    return;
  }
  $self->depends_on('build');
  ExtUtils::Install::install($self->install_map, !$self->quiet, 1, $self->{args}{uninst}||0);
}

sub ACTION_versioninstall {
  my ($self) = @_;
  
  die "You must have only.pm 0.25 or greater installed for this operation: $@\n"
    unless eval { require only; 'only'->VERSION(0.25); 1 };
  
  $self->depends_on('build');
  
  my %onlyargs = map {exists($self->{args}{$_}) ? ($_ => $self->{args}{$_}) : ()}
    qw(version versionlib);
  only::install::install(%onlyargs);
}

sub ACTION_installdeps {
  my ($self) = @_;

  # XXX include feature prerequisites as optional prereqs?

  my $info = $self->_enum_prereqs;
  if (! $info ) {
    $self->log_info( "No prerequisites detected\n" );
    return;
  }

  my $failures = $self->prereq_failures($info);
  if ( ! $failures ) {
    $self->log_info( "All prerequisites satisfied\n" );
    return;
  }

  my @install;
  while (my ($type, $prereqs) = each %$failures) {
    if($type =~ m/^(?:\w+_)?requires$/) {
      push(@install, keys %$prereqs);
      next;
    }
    $self->log_info("Checking optional dependencies:\n");
    while (my ($module, $status) = each %$prereqs) {
      push(@install, $module) if($self->y_n("Install $module?", 'y'));
    }
  }

  return unless @install;

  my ($command, @opts) = $self->split_like_shell($self->cpan_client);

  # relative command should be relative to our active Perl
  # so we need to locate that command
  if ( ! File::Spec->file_name_is_absolute( $command ) ) {
    require IPC::Cmd;
    my @bindirs = File::Basename::dirname($self->perl);
    push @bindirs, map {$self->config->{"install${_}bin"}} '','site','vendor';
    for my $d ( @bindirs ) {
      my $abs_cmd = IPC::Cmd::can_run(File::Spec->catfile( $d, $command ));
      if ( defined $abs_cmd ) {
        $command = $abs_cmd;
        last;
      }
    }
  }

  if ( ! -x $command ) {
    die "cpan_client '$command' is not executable\n";
  }

  $self->do_system($command, @opts, @install);
}

sub ACTION_clean {
  my ($self) = @_;
  foreach my $item (map glob($_), $self->cleanup) {
    $self->delete_filetree($item);
  }
}

sub ACTION_realclean {
  my ($self) = @_;
  $self->depends_on('clean');
  $self->delete_filetree($self->config_dir, $self->build_script);
}

sub ACTION_ppd {
  my ($self) = @_;
  require Module::Build::PPMMaker;
  my $ppd = Module::Build::PPMMaker->new();
  my $file = $ppd->make_ppd(%{$self->{args}}, build => $self);
  $self->add_to_cleanup($file);
}

sub ACTION_ppmdist {
  my ($self) = @_;

  $self->depends_on( 'build' );

  my $ppm = $self->ppm_name;
  $self->delete_filetree( $ppm );
  $self->log_info( "Creating $ppm\n" );
  $self->add_to_cleanup( $ppm, "$ppm.tar.gz" );

  my %types = ( # translate types/dirs to those expected by ppm
    lib => 'lib',
    arch => 'arch',
    bin => 'bin',
    script => 'script',
    bindoc => 'man1',
    libdoc => 'man3',
    binhtml => undef,
    libhtml => undef,
  );

  foreach my $type ($self->install_types) {
    next if exists( $types{$type} ) && !defined( $types{$type} );

    my $dir = File::Spec->catdir( $self->blib, $type );
    next unless -e $dir;

    my $files = $self->rscan_dir( $dir );
    foreach my $file ( @$files ) {
      next unless -f $file;
      my $rel_file =
File::Spec->abs2rel( File::Spec->rel2abs( $file ),
File::Spec->rel2abs( $dir ) );
      my $to_file =
File::Spec->catfile( $ppm, 'blib',
exists( $types{$type} ) ? $types{$type} : $type,
$rel_file );
      $self->copy_if_modified( from => $file, to => $to_file );
    }
  }

  foreach my $type ( qw(bin lib) ) {
    local $self->{properties}{html_css} = 'Active.css';
    $self->htmlify_pods( $type, File::Spec->catdir($ppm, 'blib', 'html') );
  }

  # create a tarball;
  # the directory tar'ed must be blib so we need to do a chdir first
  my $target = File::Spec->catfile( File::Spec->updir, $ppm );
  $self->_do_in_dir( $ppm, sub { $self->make_tarball( 'blib', $target ) } );

  $self->depends_on( 'ppd' );

  $self->delete_filetree( $ppm );
}

sub ACTION_pardist {
  my ($self) = @_;

  # Need PAR::Dist
  if ( not eval { require PAR::Dist; PAR::Dist->VERSION(0.17) } ) {
    $self->log_warn(
      "In order to create .par distributions, you need to\n"
      . "install PAR::Dist first."
    );
    return();
  }
  
  $self->depends_on( 'build' );

  return PAR::Dist::blib_to_par(
    name => $self->dist_name,
    version => $self->dist_version,
  );
}

sub ACTION_dist {
  my ($self) = @_;
  
  $self->depends_on('distdir');
  
  my $dist_dir = $self->dist_dir;
  
  $self->make_tarball($dist_dir);
  $self->delete_filetree($dist_dir);
}

sub ACTION_distcheck {
  my ($self) = @_;

  $self->_check_mymeta_skip('MANIFEST.SKIP');

  require ExtUtils::Manifest;
  local $^W; # ExtUtils::Manifest is not warnings clean.
  my ($missing, $extra) = ExtUtils::Manifest::fullcheck();

  return unless @$missing || @$extra;

  my $msg = "MANIFEST appears to be out of sync with the distribution\n";
  if ( $self->invoked_action eq 'distcheck' ) {
    die $msg;
  } else {
    warn $msg;
  }
}

sub _check_mymeta_skip {
  my $self = shift;
  my $maniskip = shift || 'MANIFEST.SKIP';

  require ExtUtils::Manifest;
  local $^W; # ExtUtils::Manifest is not warnings clean.

  my $skip_check = ExtUtils::Manifest::maniskip($maniskip);
  my $mymetafile = $self->mymetafile;
  if ( ! $skip_check->( $mymetafile ) ) {
    $self->log_warn("File '$maniskip' does not include '$mymetafile'. Adding it now.\n");
    $self->_append_maniskip("^$mymetafile\$", $maniskip);
  }
}

sub _add_to_manifest {
  my ($self, $manifest, $lines) = @_;
  $lines = [$lines] unless ref $lines;

  my $existing_files = $self->_read_manifest($manifest);
  return unless defined( $existing_files );

  @$lines = grep {!exists $existing_files->{$_}} @$lines
    or return;

  my $mode = (stat $manifest)[2];
  chmod($mode | oct(222), $manifest) or die "Can't make $manifest writable: $!";
  
  my $fh = IO::File->new("< $manifest") or die "Can't read $manifest: $!";
  my $last_line = (<$fh>)[-1] || "\n";
  my $has_newline = $last_line =~ /\n$/;
  $fh->close;

  $fh = IO::File->new(">> $manifest") or die "Can't write to $manifest: $!";
  print $fh "\n" unless $has_newline;
  print $fh map "$_\n", @$lines;
  close $fh;
  chmod($mode, $manifest);

  $self->log_verbose(map "Added to $manifest: $_\n", @$lines);
}

sub _sign_dir {
  my ($self, $dir) = @_;

  unless (eval { require Module::Signature; 1 }) {
    $self->log_warn("Couldn't load Module::Signature for 'distsign' action:\n $@\n");
    return;
  }
  
  # Add SIGNATURE to the MANIFEST
  {
    my $manifest = File::Spec->catfile($dir, 'MANIFEST');
    die "Signing a distribution requires a MANIFEST file" unless -e $manifest;
    $self->_add_to_manifest($manifest, "SIGNATURE Added here by Module::Build");
  }
  
  # Would be nice if Module::Signature took a directory argument.
  
  $self->_do_in_dir($dir, sub {local $Module::Signature::Quiet = 1; Module::Signature::sign()});
}

sub _do_in_dir {
  my ($self, $dir, $do) = @_;

  my $start_dir = $self->cwd;
  chdir $dir or die "Can't chdir() to $dir: $!";
  eval {$do->()};
  my @err = $@ ? ($@) : ();
  chdir $start_dir or push @err, "Can't chdir() back to $start_dir: $!";
  die join "\n", @err if @err;
}

sub ACTION_distsign {
  my ($self) = @_;
  {
    local $self->{properties}{sign} = 0; # We'll sign it ourselves
    $self->depends_on('distdir') unless -d $self->dist_dir;
  }
  $self->_sign_dir($self->dist_dir);
}

sub ACTION_skipcheck {
  my ($self) = @_;
  
  require ExtUtils::Manifest;
  local $^W; # ExtUtils::Manifest is not warnings clean.
  ExtUtils::Manifest::skipcheck();
}

sub ACTION_distclean {
  my ($self) = @_;
  
  $self->depends_on('realclean');
  $self->depends_on('distcheck');
}

sub do_create_makefile_pl {
  my $self = shift;
  require Module::Build::Compat;
  $self->log_info("Creating Makefile.PL\n");
  Module::Build::Compat->create_makefile_pl($self->create_makefile_pl, $self, @_);
  $self->_add_to_manifest('MANIFEST', 'Makefile.PL');
}

sub do_create_license {
  my $self = shift;
  $self->log_info("Creating LICENSE file\n");

  my $l = $self->license
    or die "No license specified";

  my $key = $self->valid_licenses->{$l}
    or die "'$l' isn't a license key we know about";
  my $class = "Software::License::$key";

  eval "use $class; 1"
    or die "Can't load Software::License to create LICENSE file: $@";

  $self->delete_filetree('LICENSE');

  my $author = join " & ", @{ $self->dist_author };
  my $license = $class->new({holder => $author});
  my $fh = IO::File->new('> LICENSE')
    or die "Can't write LICENSE file: $!";
  print $fh $license->fulltext;
  close $fh;

  $self->_add_to_manifest('MANIFEST', 'LICENSE');
}

sub do_create_readme {
  my $self = shift;
  $self->delete_filetree('README');

  my $docfile = $self->_main_docfile;
  unless ( $docfile ) {
    $self->log_warn(<<EOF);
Cannot create README: can't determine which file contains documentation;
Must supply either 'dist_version_from', or 'module_name' parameter.
EOF
return;
}

if ( eval {require Pod::Readme; 1} ) {
$self->log_info("Creating README using Pod::Readme\n");

my $parser = Pod::Readme->new;
$parser->parse_from_file($docfile, 'README', @_);

} elsif ( eval {require Pod::Text; 1} ) {
$self->log_info("Creating README using Pod::Text\n");

my $fh = IO::File->new('> README');
if ( defined($fh) ) {
local $^W = 0;
no strict "refs";

# work around bug in Pod::Text 3.01, which expects
# Pod::Simple::parse_file to take input and output filehandles
# when it actually only takes an input filehandle

my $old_parse_file;
$old_parse_file = \&{"Pod::Simple::parse_file"}
and
local *{"Pod::Simple::parse_file"} = sub {
my $self = shift;
$self->output_fh($_[1]) if $_[1];
$self->$old_parse_file($_[0]);
}
if $Pod::Text::VERSION
== 3.01; # Split line to avoid evil version-finder

Pod::Text::pod2text( $docfile, $fh );

$fh->close;
} else {
$self->log_warn(
"Cannot create 'README' file: Can't open file for writing\n" );
return;
}

} else {
$self->log_warn("Can't load Pod::Readme or Pod::Text to create README\n");
return;
}

$self->_add_to_manifest('MANIFEST', 'README');
}

sub _main_docfile {
my $self = shift;
if ( my $pm_file = $self->dist_version_from ) {
(my $pod_file = $pm_file) =~ s/.pm$/.pod/;
return (-e $pod_file ? $pod_file : $pm_file);
} else {
return undef;
}
}

sub ACTION_distdir {
my ($self) = @_;

$self->depends_on('distmeta');
# Must not include MYMETA
$self->_check_mymeta_skip('MANIFEST.SKIP');

my $dist_files = $self->_read_manifest('MANIFEST')
or die "Can't create distdir without a MANIFEST file - run 'manifest' action first.\n";
delete $dist_files->{SIGNATURE}; # Don't copy, create a fresh one
die "No files found in MANIFEST - try running 'manifest' action?\n"
unless ($dist_files and keys %$dist_files);
my $metafile = $self->metafile;
$self->log_warn("*** Did you forget to add $metafile to the MANIFEST?\n")
unless exists $dist_files->{$metafile};
my $dist_dir = $self->dist_dir;
$self->delete_filetree($dist_dir);
$self->log_info("Creating $dist_dir\n");
$self->add_to_cleanup($dist_dir);
foreach my $file (keys %$dist_files) {
my $new = $self->copy_if_modified(from => $file, to_dir => $dist_dir, verbose => 0);
}
$self->_sign_dir($dist_dir) if $self->{properties}{sign};
}

sub ACTION_disttest {
my ($self) = @_;

$self->depends_on('distdir');

$self->_do_in_dir
( $self->dist_dir,
sub {
# XXX could be different names for scripts

$self->run_perl_script('Build.PL') # XXX Should this be run w/ --nouse-rcfile
or die "Error executing 'Build.PL' in dist directory: $!";
$self->run_perl_script('Build')
or die "Error executing 'Build' in dist directory: $!";
$self->run_perl_script('Build', [], ['test'])
or die "Error executing 'Build test' in dist directory";
});
}


=begin private

my $has_include = $build->_eumanifest_has_include;

Returns true if the installed version of ExtUtils::Manifest supports
#include and #include_default directives. False otherwise.

=end private

=cut

# #!include and #!include_default were added in 1.50
sub _eumanifest_has_include {
my $self = shift;

require ExtUtils::Manifest;
return ExtUtils::Manifest->VERSION >= 1.50 ? 1 : 0;
return 0;
}


=begin private

my $maniskip_file = $build->_default_maniskip;

Returns the location of the installed MANIFEST.SKIP file used by
default.

=end private

=cut

sub _default_maniskip {
my $self = shift;

my $default_maniskip;
for my $dir (@INC) {
$default_maniskip = File::Spec->catfile($dir, "ExtUtils", "MANIFEST.SKIP");
last if -r $default_maniskip;
}

return $default_maniskip;
}


=begin private

my $content = $build->_slurp($file);

Reads $file and returns the $content.

=end private

=cut

sub _slurp {
my $self = shift;
my $file = shift;
open my $fh, "<", $file or croak "Can't open $file: $!";
local $/;
return <$fh>;
}



sub _append_maniskip {
my $self = shift;
my $skip = shift;
my $file = shift || 'MANIFEST.SKIP';
return unless defined $skip && length $skip;
my $fh = IO::File->new(">> $file")
or die "Can't open $file: $!";

print $fh "$skip\n";
$fh->close();
}

sub _write_default_maniskip {
my $self = shift;
my $file = shift || 'MANIFEST.SKIP';
my $fh = IO::File->new("> $file")
or die "Can't open $file: $!";

my $content = $self->_eumanifest_has_include ? "#!include_default\n"
: $self->_slurp( $self->_default_maniskip );

$content .= <<'EOF';
# Avoid configuration metadata file
^MYMETA.yml$

# Avoid Module::Build generated and utility files.
\bBuild$
\bBuild.bat$
\b_build
\bBuild.COM$
\bBUILD.COM$
\bbuild.com$

# Avoid archives of this distribution
EOF

# Skip, for example, 'Module-Build-0.27.tar.gz'
$content .= '\b'.$self->dist_name.'-[\d\.\_]+'."\n";

print $fh $content;

return;
}

sub ACTION_manifest {
my ($self) = @_;

my $maniskip = 'MANIFEST.SKIP';

if ( ! -e $maniskip ) {
$self->log_warn("File '$maniskip' does not exist: Creating a default '$maniskip'\n");
$self->_write_default_maniskip($maniskip);
}
else {
# MYMETA must not be added to MANIFEST, so always confirm the skip
$self->_check_mymeta_skip( $maniskip );
}

require ExtUtils::Manifest; # ExtUtils::Manifest is not warnings clean.
local ($^W, $ExtUtils::Manifest::Quiet) = (0,1);
ExtUtils::Manifest::mkmanifest();
}

# Case insensitive regex for files
sub file_qr {
return File::Spec->case_tolerant ? qr($_[0])i : qr($_[0]);
}

sub dist_dir {
my ($self) = @_;
return join "-", $self->dist_name, $self->dist_version;
}

sub ppm_name {
my $self = shift;
return 'PPM-' . $self->dist_dir;
}

sub _files_in {
my ($self, $dir) = @_;
return unless -d $dir;

local *DH;
opendir DH, $dir or die "Can't read directory $dir: $!";

my @files;
while (defined (my $file = readdir DH)) {
my $full_path = File::Spec->catfile($dir, $file);
next if -d $full_path;
push @files, $full_path;
}
return @files;
}

sub share_dir {
my $self = shift;
my $p = $self->{properties};
$p->{share_dir} = shift if @_;

# Always coerce to proper hash form
if ( ! defined $p->{share_dir} ) {
# not set -- use default 'share' dir if exists
$p->{share_dir} = { dist => [ 'share' ] } if -d 'share';
}
elsif ( ! ref $p->{share_dir} ) {
# scalar -- treat as a single 'dist' directory
$p->{share_dir} = { dist => [ $p->{share_dir} ] };
}
elsif ( ref $p->{share_dir} eq 'ARRAY' ) {
# array -- treat as a list of 'dist' directories
$p->{share_dir} = { dist => $p->{share_dir} };
}
elsif ( ref $p->{share_dir} eq 'HASH' ) {
# hash -- check structure
my $share_dir = $p->{share_dir};
# check dist key
if ( defined $share_dir->{dist} ) {
if ( ! ref $share_dir->{dist} ) {
# scalar, so upgrade to arrayref
$share_dir->{dist} = [ $share_dir->{dist} ];
}
elsif ( ref $share_dir->{dist} ne 'ARRAY' ) {
die "'dist' key in 'share_dir' must be scalar or arrayref";
}
}
# check module key
if ( defined $share_dir->{module} ) {
my $mod_hash = $share_dir->{module};
if ( ref $mod_hash eq 'HASH' ) {
for my $k ( keys %$mod_hash ) {
if ( ! ref $mod_hash->{$k} ) {
$mod_hash->{$k} = [ $mod_hash->{$k} ];
}
elsif( ref $mod_hash->{$k} ne 'ARRAY' ) {
die "modules in 'module' key of 'share_dir' must be scalar or arrayref";
}
}
}
else {
die "'module' key in 'share_dir' must be hashref";
}
}
}
else {
die "'share_dir' must be hashref, arrayref or string";
}

return $p->{share_dir};
}

sub script_files {
my $self = shift;

for ($self->{properties}{script_files}) {
$_ = shift if @_;
next unless $_;

# Always coerce into a hash
return $_ if UNIVERSAL::isa($_, 'HASH');
return $_ = { map {$_,1} @$_ } if UNIVERSAL::isa($_, 'ARRAY');

die "'script_files' must be a hashref, arrayref, or string" if ref();

return $_ = { map {$_,1} $self->_files_in( $_ ) } if -d $_;
return $_ = {$_ => 1};
}

my %pl_files = map {
File::Spec->canonpath( File::Spec->case_tolerant ? uc $_ : $_ ) => 1
} keys %{ $self->PL_files || {} };

my @bin_files = $self->_files_in('bin');

my %bin_map = map {
$_ => File::Spec->canonpath( File::Spec->case_tolerant ? uc $_ : $_ )
} @bin_files;

return $_ = { map {$_ => 1} grep !$pl_files{$bin_map{$_}}, @bin_files };
}
BEGIN { *scripts = \&script_files; }

{
my %licenses = (
perl => 'Perl_5',
apache => 'Apache_2_0',
artistic => 'Artistic_1_0',
artistic_2 => 'Artistic_2_0',
lgpl => 'LGPL_2_1',
lgpl2 => 'LGPL_2_1',
lgpl3 => 'LGPL_3_0',
bsd => 'BSD',
gpl => 'GPL_1',
gpl2 => 'GPL_2',
gpl3 => 'GPL_3',
mit => 'MIT',
mozilla => 'Mozilla_1_1',
open_source => undef,
unrestricted => undef,
restrictive => undef,
unknown => undef,
);

# TODO - would be nice to not have these here, since they're more
# properly stored only in Software::License
my %license_urls = (
perl => 'http://dev.perl.org/licenses/',
apache => 'http://apache.org/licenses/LICENSE-2.0',
artistic => 'http://opensource.org/licenses/artistic-license.php',
artistic_2 => 'http://opensource.org/licenses/artistic-license-2.0.php',
lgpl => 'http://opensource.org/licenses/lgpl-license.php',
lgpl2 => 'http://opensource.org/licenses/lgpl-2.1.php',
lgpl3 => 'http://opensource.org/licenses/lgpl-3.0.html',
bsd => 'http://opensource.org/licenses/bsd-license.php',
gpl => 'http://opensource.org/licenses/gpl-license.php',
gpl2 => 'http://opensource.org/licenses/gpl-2.0.php',
gpl3 => 'http://opensource.org/licenses/gpl-3.0.html',
mit => 'http://opensource.org/licenses/mit-license.php',
mozilla => 'http://opensource.org/licenses/mozilla1.1.php',
open_source => undef,
unrestricted => undef,
restrictive => undef,
unknown => undef,
);
sub valid_licenses {
return \%licenses;
}
sub _license_url {
return $license_urls{$_[1]};
}
}

sub _hash_merge {
my ($self, $h, $k, $v) = @_;
if (ref $h->{$k} eq 'ARRAY') {
push @{$h->{$k}}, ref $v ? @$v : $v;
} elsif (ref $h->{$k} eq 'HASH') {
$h->{$k}{$_} = $v->{$_} foreach keys %$v;
} else {
$h->{$k} = $v;
}
}

sub ACTION_distmeta {
my ($self) = @_;

$self->do_create_makefile_pl if $self->create_makefile_pl;
$self->do_create_readme if $self->create_readme;
$self->do_create_license if $self->create_license;
$self->do_create_metafile;
}

sub do_create_metafile {
my $self = shift;
return if $self->{wrote_metadata};
my $p = $self->{properties};
my $metafile = $self->metafile;
unless ($p->{license}) {
$self->log_warn("No license specified, setting license = 'unknown'\n");
$p->{license} = 'unknown';
}
unless (exists $self->valid_licenses->{ $p->{license} }) {
die "Unknown license type '$p->{license}'";
}

# If we're in the distdir, the metafile may exist and be non-writable.
$self->delete_filetree($metafile);
$self->log_info("Creating $metafile\n");

# Since we're building ourself, we have to do some special stuff
# here: the ConfigData module is found in blib/lib.
local @INC = @INC;
if (($self->module_name || '') eq 'Module::Build') {
$self->depends_on('config_data');
push @INC, File::Spec->catdir($self->blib, 'lib');
}

if ( $self->write_metafile( $self->metafile, $self->prepare_metadata ) ) {
$self->{wrote_metadata} = 1;
$self->_add_to_manifest('MANIFEST', $metafile);
}

return 1;
}

sub write_metafile {
my $self = shift;
my ($metafile, $node) = @_;
my $yaml;

if ($self->_mb_feature('YAML_support')) {
# XXX this is probably redundant, but stick with it
require YAML::Tiny;
$yaml = YAML::Tiny->new($node);
} else {
require Module::Build::YAML;
$yaml = Module::Build::YAML->new($node);
}
my $result = $yaml->write($metafile)
or $self->log_warn( "Error writing '$metafile': " . $yaml->errstr . "\n");
return $result;
}

sub normalize_version {
my ($self, $version) = @_;
if ( $version =~ /[=<>!,]/ ) { # logic, not just version
# take as is without modification
}
elsif ( ref $version eq 'version' ||
ref $version eq 'Module::Build::Version' ) { # version objects
$version = $version->is_qv ? $version->normal : $version->stringify;
}
elsif ( $version =~ /^[^v][^.]*\.[^.]+\./ ) { # no leading v, multiple dots
# normalize string tuples without "v": "1.2.3" -> "v1.2.3"
$version = "v$version";
}
else {
# leave alone
}
return $version;
}

sub prepare_metadata {
my ($self) = @_;
my $p = $self->{properties};
my $node = {};

# A little helper sub
my $add_node = sub {
my ($name, $val) = @_;
$node->{$name} = $val;
};

foreach (qw(dist_name dist_version dist_author dist_abstract license)) {
(my $name = $_) =~ s/^dist_//;
$add_node->($name, $self->$_());
die "ERROR: Missing required field '$_' for metafile\n"
unless defined($node->{$name}) && length($node->{$name});
}
$node->{version} = $self->normalize_version($node->{version});

if (defined( my $l = $self->license )) {
die "Unknown license string '$l'"
unless exists $self->valid_licenses->{ $l };

if (my $key = $self->valid_licenses->{ $l }) {
my $class = "Software::License::$key";
if (eval "use $class; 1") {
# S::L requires a 'holder' key
$node->{resources}{license} = $class->new({holder=>"nobody"})->url;
}
else {
$node->{resources}{license} = $self->_license_url($l);
}
}
# XXX we are silently omitting the url for any unknown license
}

# copy prereq data structures so we can modify them before writing to META
my %prereq_types;
for my $type ( 'configure_requires', @{$self->prereq_action_types} ) {
if (exists $p->{$type}) {
for my $mod ( keys %{ $p->{$type} } ) {
$prereq_types{$type}{$mod} =
$self->normalize_version($p->{$type}{$mod});
}
}
}

for my $t ( keys %prereq_types ) {
$add_node->($t, $prereq_types{$t});
}

if (exists $p->{dynamic_config}) {
$add_node->('dynamic_config', $p->{dynamic_config});
}
my $pkgs = eval { $self->find_dist_packages };
if ($@) {
$self->log_warn("$@\nWARNING: Possible missing or corrupt 'MANIFEST' file.\n" .
"Nothing to enter for 'provides' field in metafile.\n");
} else {
$node->{provides} = $pkgs if %$pkgs;
}
;
if (exists $p->{no_index}) {
$add_node->('no_index', $p->{no_index});
}

$add_node->('generated_by', "Module::Build version $Module::Build::VERSION");

$add_node->('meta-spec',
{version => '1.4',
url => 'http://module-build.sourceforge.net/META-spec-v1.4.html',
});

while (my($k, $v) = each %{$self->meta_add}) {
$add_node->($k, $v);
}

while (my($k, $v) = each %{$self->meta_merge}) {
$self->_hash_merge($node, $k, $v);
}

return $node;
}

sub _read_manifest {
my ($self, $file) = @_;
return undef unless -e $file;

require ExtUtils::Manifest; # ExtUtils::Manifest is not warnings clean.
local ($^W, $ExtUtils::Manifest::Quiet) = (0,1);
return scalar ExtUtils::Manifest::maniread($file);
}

sub find_dist_packages {
my $self = shift;

# Only packages in .pm files are candidates for inclusion here.
# Only include things in the MANIFEST, not things in developer's
# private stock.

my $manifest = $self->_read_manifest('MANIFEST')
or die "Can't find dist packages without a MANIFEST file\nRun 'Build manifest' to generate one\n";

# Localize
my %dist_files = map { $self->localize_file_path($_) => $_ }
keys %$manifest;

my @pm_files = grep {exists $dist_files{$_}} keys %{ $self->find_pm_files };

# First, we enumerate all packages & versions,
# separating into primary & alternative candidates
my( %prime, %alt );
foreach my $file (@pm_files) {
next if $dist_files{$file} =~ m{^t/}; # Skip things in t/

my @path = split( /\//, $dist_files{$file} );
(my $prime_package = join( '::', @path[1..$#path] )) =~ s/\.pm$//;

my $pm_info = Module::Build::ModuleInfo->new_from_file( $file );

foreach my $package ( $pm_info->packages_inside ) {
next if $package eq 'main'; # main can appear numerous times, ignore
next if grep /^_/, split( /::/, $package ); # private package, ignore

my $version = $pm_info->version( $package );

if ( $package eq $prime_package ) {
if ( exists( $prime{$package} ) ) {
# M::B::ModuleInfo will handle this conflict
die "Unexpected conflict in '$package'; multiple versions found.\n";
} else {
$prime{$package}{file} = $dist_files{$file};
$prime{$package}{version} = $version if defined( $version );
}
} else {
push( @{$alt{$package}}, {
file => $dist_files{$file},
version => $version,
} );
}
}
}

# Then we iterate over all the packages found above, identifying conflicts
# and selecting the "best" candidate for recording the file & version
# for each package.
foreach my $package ( keys( %alt ) ) {
my $result = $self->_resolve_module_versions( $alt{$package} );

if ( exists( $prime{$package} ) ) { # primary package selected

if ( $result->{err} ) {
# Use the selected primary package, but there are conflicting
# errors among multiple alternative packages that need to be
# reported
$self->log_warn(
"Found conflicting versions for package '$package'\n" .
" $prime{$package}{file} ($prime{$package}{version})\n" .
$result->{err}
);

} elsif ( defined( $result->{version} ) ) {
# There is a primary package selected, and exactly one
# alternative package

if ( exists( $prime{$package}{version} ) &&
defined( $prime{$package}{version} ) ) {
# Unless the version of the primary package agrees with the
# version of the alternative package, report a conflict
if ( $self->compare_versions( $prime{$package}{version}, '!=',
$result->{version} ) ) {
$self->log_warn(
"Found conflicting versions for package '$package'\n" .
" $prime{$package}{file} ($prime{$package}{version})\n" .
" $result->{file} ($result->{version})\n"
);
}

} else {
# The prime package selected has no version so, we choose to
# use any alternative package that does have a version
$prime{$package}{file} = $result->{file};
$prime{$package}{version} = $result->{version};
}

} else {
# no alt package found with a version, but we have a prime
# package so we use it whether it has a version or not
}

} else { # No primary package was selected, use the best alternative

if ( $result->{err} ) {
$self->log_warn(
"Found conflicting versions for package '$package'\n" .
$result->{err}
);
}

# Despite possible conflicting versions, we choose to record
# something rather than nothing
$prime{$package}{file} = $result->{file};
$prime{$package}{version} = $result->{version}
if defined( $result->{version} );
}
}

# Normalize versions. Can't use exists() here because of bug in YAML::Node.
  # XXX "bug in YAML::Node" comment seems irrelvant -- dagolden, 2009-05-18
  for (grep defined $_->{version}, values %prime) {
    $_->{version} = $self->normalize_version( $_->{version} );
  }

  return \%prime;
}

# separate out some of the conflict resolution logic from
# $self->find_dist_packages(), above, into a helper function.
#
sub _resolve_module_versions {
  my $self = shift;

  my $packages = shift;

  my( $file, $version );
  my $err = '';
    foreach my $p ( @$packages ) {
      if ( defined( $p->{version} ) ) {
if ( defined( $version ) ) {
  if ( $self->compare_versions( $version, '!=', $p->{version} ) ) {
$err .= " $p->{file} ($p->{version})\n";
} else {
# same version declared multiple times, ignore
}
} else {