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+package DistGen;
+
+use strict;
+
+our $VERSION = '0.01';
+our $VERBOSE = 0;
+
+use Carp;
+
+use Cwd ();
+use File::Basename ();
+use File::Find ();
+use File::Path ();
+use File::Spec ();
+use File::Temp ();
+use IO::File ();
+use Data::Dumper ();
+use Exporter 5.57 'import';
+
+our @EXPORT_OK = qw(undent);
+
+sub undent {
+ my ($string) = @_;
+
+ my ($space) = $string =~ m/^(\s+)/;
+ $string =~ s/^$space//gm;
+
+ return($string);
+}
+
+sub chdir_all ($) {
+ # OS/2 has "current directory per disk", undeletable;
+ # doing chdir() to another disk won't change cur-dir of initial disk...
+ chdir('/') if $^O eq 'os2';
+ chdir shift;
+}
+
+########################################################################
+
+my $orig_cwd = Cwd::cwd;
+END { chdir_all($orig_cwd); }
+
+sub new {
+ my $self = bless {}, shift;
+ $self->reset(@_);
+}
+
+sub reset {
+ my $self = shift;
+ my %options = @_;
+
+ $options{name} ||= 'Simple';
+ $options{dir} ||= File::Spec->rel2abs(File::Temp::tempdir(
+ DIR => File::Spec->curdir, CLEANUP => 1
+ ));
+
+ my %data = (
+ %options,
+ );
+ %$self = %data;
+
+ $self->{filedata} = {};
+ $self->{pending}{change} = {};
+
+ # start with a fresh, empty directory
+ if ( -d $self->dirname ) {
+ warn "Warning: Removing existing directory '@{[$self->dirname]}'\n";
+ File::Path::rmtree( $self->dirname );
+ }
+ File::Path::mkpath( $self->dirname );
+
+ $self->_gen_default_filedata();
+
+ return $self;
+}
+
+sub remove {
+ my $self = shift;
+ $self->chdir_original if($self->did_chdir);
+ File::Path::rmtree( $self->dirname );
+ return $self;
+}
+
+sub revert {
+ my ($self, $file) = @_;
+ if ( defined $file ) {
+ delete $self->{filedata}{$file};
+ delete $self->{pending}{$_}{$file} for qw/change remove/;
+ }
+ else {
+ delete $self->{filedata}{$_} for keys %{ $self->{filedata} };
+ for my $pend ( qw/change remove/ ) {
+ delete $self->{pending}{$pend}{$_} for keys %{ $self->{pending}{$pend} };
+ }
+ }
+ $self->_gen_default_filedata;
+}
+
+sub _gen_default_filedata {
+ my $self = shift;
+
+ # TODO maybe a public method like this (but with a better name?)
+ my $add_unless = sub {
+ my $self = shift;
+ my ($member, $data) = @_;
+ $self->add_file($member, $data) unless($self->{filedata}{$member});
+ };
+
+ $self->$add_unless('Build.PL', undent(<<" ---"));
+ use lib 'inc'; use Module::Build::Tiny;Build_PL(\@ARGV);
+ ---
+
+ my $module_filename =
+ join( '/', ('lib', split(/::/, $self->{name})) ) . '.pm';
+
+ my $module_name = $self->{name};
+ (my $dist_name = $module_name) =~ s/::/-/g;
+
+ $self->$add_unless($module_filename, undent(<<" ---"));
+ package $module_name;
+
+ use vars qw( \$VERSION );
+ \$VERSION = '0.01';
+
+ use strict;
+
+ use Carp 0 ();
+
+ 1;
+
+ __END__
+
+ =head1 NAME
+
+ $module_name - Perl extension for blah blah blah
+
+ =head1 DESCRIPTION
+
+ Stub documentation for $module_name.
+
+ =head1 AUTHOR
+
+ A. U. Thor, a.u.thor\@a.galaxy.far.far.away
+
+ =cut
+ ---
+
+ $self->$add_unless('t/basic.t', undent(<<" ---"));
+ use Test::More 0.23 tests => 1;
+ use strict;
+
+ use $module_name;
+ ok 1;
+ ---
+
+ $self->$add_unless('META.yml', undent(<<" ----"));
+ ---
+ name: $dist_name
+ version: 0.001
+ author:
+ - 'David Golden <dagolden\@cpan.org>'
+ - 'Leon Timmermans <leont\@cpan.org>'
+ abstract: 'A testing dist'
+ license: perl
+ requires:
+ perl: 5.006
+ Module::Build::Tiny: 0
+ generated_by: Leon Timmermans
+ dynamic_config: 0
+ meta-spec:
+ url: http://module-build.sourceforge.net/META-spec-v1.4.html
+ version: 1.4
+ ----
+}
+
+sub name { shift()->{name} }
+
+sub dirname {
+ my $self = shift;
+ my $dist = join( '-', split( /::/, $self->{name} ) );
+ return File::Spec->catdir( $self->{dir}, $dist );
+}
+
+sub _real_filename {
+ my $self = shift;
+ my $filename = shift;
+ return File::Spec->catfile( split( /\//, $filename ) );
+}
+
+sub regen {
+ my $self = shift;
+ my %opts = @_;
+
+ my $dist_dirname = $self->dirname;
+
+ if ( $opts{clean} ) {
+ $self->clean() if -d $dist_dirname;
+ } else {
+ # TODO: This might leave dangling directories; e.g. if the removed file
+ # is 'lib/Simple/Simon.pm', the directory 'lib/Simple' will be left
+ # even if there are no files left in it. However, clean() will remove it.
+ my @files = keys %{$self->{pending}{remove}};
+ foreach my $file ( @files ) {
+ my $real_filename = $self->_real_filename( $file );
+ my $fullname = File::Spec->catfile( $dist_dirname, $real_filename );
+ if ( -e $fullname ) {
+ 1 while File::Path::rmtree($fullname, 0, 0);
+ }
+ print "Unlinking pending file '$file'\n" if $VERBOSE;
+ delete( $self->{pending}{remove}{$file} );
+ }
+ }
+
+ foreach my $file ( keys( %{$self->{filedata}} ) ) {
+ my $real_filename = $self->_real_filename( $file );
+ my $fullname = File::Spec->catfile( $dist_dirname, $real_filename );
+
+ if ( ! -e $fullname ||
+ ( -e $fullname && $self->{pending}{change}{$file} ) ) {
+
+ print "Changed file '$file'.\n" if $VERBOSE;
+
+ my $dirname = File::Basename::dirname( $fullname );
+ unless ( -d $dirname ) {
+ File::Path::mkpath( $dirname ) or do {
+ die "Can't create '$dirname'\n";
+ };
+ }
+
+ if ( -e $fullname ) {
+ 1 while unlink( $fullname );
+ }
+
+ my $fh = IO::File->new(">$fullname") or do {
+ die "Can't write '$fullname'\n";
+ };
+ print $fh $self->{filedata}{$file};
+ close( $fh );
+ }
+
+ delete( $self->{pending}{change}{$file} );
+ }
+
+ return $self;
+}
+
+sub clean {
+ my $self = shift;
+
+ my $here = Cwd::abs_path();
+ my $there = File::Spec->rel2abs( $self->dirname() );
+
+ if ( -d $there ) {
+ chdir( $there ) or die "Can't change directory to '$there'\n";
+ } else {
+ die "Distribution not found in '$there'\n";
+ }
+
+ my %names;
+ foreach my $file ( keys %{$self->{filedata}} ) {
+ my $filename = $self->_real_filename( $file );
+ my $dirname = File::Basename::dirname( $filename );
+
+ $names{$filename} = 0;
+
+ print "Splitting '$dirname'\n" if $VERBOSE;
+ my @dirs = File::Spec->splitdir( $dirname );
+ while ( @dirs ) {
+ my $dir = ( scalar(@dirs) == 1
+ ? $dirname
+ : File::Spec->catdir( @dirs ) );
+ if (length $dir) {
+ print "Setting directory name '$dir' in \%names\n" if $VERBOSE;
+ $names{$dir} = 0;
+ }
+ pop( @dirs );
+ }
+ }
+
+ File::Find::finddepth( sub {
+ my $name = File::Spec->canonpath( $File::Find::name );
+
+ if ( not exists $names{$name} ) {
+ print "Removing '$name'\n" if $VERBOSE;
+ File::Path::rmtree( $_ );
+ }
+ }, File::Spec->curdir );
+
+
+ chdir_all( $here );
+ return $self;
+}
+
+sub add_file {
+ my $self = shift;
+ $self->change_file( @_ );
+}
+
+sub remove_file {
+ my $self = shift;
+ my $file = shift;
+ unless ( exists $self->{filedata}{$file} ) {
+ warn "Can't remove '$file': It does not exist.\n" if $VERBOSE;
+ }
+ delete( $self->{filedata}{$file} );
+ $self->{pending}{remove}{$file} = 1;
+ return $self;
+}
+
+sub change_file {
+ my $self = shift;
+ my $file = shift;
+ my $data = shift;
+ $self->{filedata}{$file} = $data;
+ $self->{pending}{change}{$file} = 1;
+ return $self;
+}
+
+sub get_file {
+ my $self = shift;
+ my $file = shift;
+ exists($self->{filedata}{$file}) or croak("no such entry: '$file'");
+ return $self->{filedata}{$file};
+}
+
+sub chdir_in {
+ my $self = shift;
+ $self->{original_dir} ||= Cwd::cwd; # only once!
+ my $dir = $self->dirname;
+ chdir($dir) or die "Can't chdir to '$dir': $!";
+ return $self;
+}
+########################################################################
+
+sub did_chdir { exists shift()->{original_dir} }
+
+########################################################################
+
+sub chdir_original {
+ my $self = shift;
+
+ my $dir = delete $self->{original_dir};
+ chdir_all($dir) or die "Can't chdir to '$dir': $!";
+ return $self;
+}
+########################################################################
+
+1;
+
+# vim:ts=2:sw=2:et:sta
+__END__
+
+
+=head1 NAME
+
+DistGen - Creates simple distributions for testing.
+
+=head1 SYNOPSIS
+
+ use DistGen;
+
+ # create distribution and prepare to test
+ my $dist = DistGen->new(name => 'Foo::Bar');
+ $dist->chdir_in;
+
+ # change distribution files
+ $dist->add_file('t/some_test.t', $contents);
+ $dist->change_file('MANIFEST.SKIP', $new_contents);
+ $dist->remove_file('t/some_test.t');
+ $dist->regen;
+
+ # undo changes and clean up extraneous files
+ $dist->revert;
+ $dist->clean;
+
+ # start over as a new distribution
+ $dist->reset( name => 'Foo::Bar' );
+ $dist->chdir_in;
+
+=head1 USAGE
+
+A DistGen object manages a set of files in a distribution directory.
+
+The C<new()> constructor initializes the object and creates an empty
+directory for the distribution. It does not create files or chdir into
+the directory. The C<reset()> method re-initializes the object in a
+new directory with new parameters. It also does not create files or change
+the current directory.
+
+Some methods only define the target state of the distribution. They do B<not>
+make any changes to the filesystem:
+
+ add_file
+ change_file
+ change_build_pl
+ remove_file
+ revert
+
+Other methods then change the filesystem to match the target state of
+the distribution:
+
+ clean
+ regen
+ remove
+
+Other methods are provided for a convenience during testing. The
+most important is the one to enter the distribution directory:
+
+ chdir_in
+
+=head1 API
+
+=head2 Constructors
+
+=head3 new()
+
+Create a new object and an empty directory to hold the distribution's files.
+If no C<dir> option is provided, it defaults to MBTest->tmpdir, which sets
+a different temp directory for Perl core testing and CPAN testing.
+
+The C<new> method does not write any files -- see L</regen()> below.
+
+ my $dist = DistGen->new(
+ name => 'Foo::Bar',
+ dir => MBTest->tmpdir,
+ );
+
+The parameters are as follows.
+
+=over
+
+=item name
+
+The name of the module this distribution represents. The default is
+'Simple'. This should be a "Foo::Bar" (module) name, not a "Foo-Bar"
+dist name.
+
+=item dir
+
+The (parent) directory in which to create the distribution directory. The
+distribution will be created under this according to the "dist" form of C<name>
+(e.g. "Foo-Bar".) Defaults to a temporary directory.
+
+ $dist = DistGen->new( dir => '/tmp/MB-test' );
+ $dist->regen;
+
+ # distribution files have been created in /tmp/MB-test/Simple
+
+=back
+
+The following files are added as part of the default distribution:
+
+ Build.PL
+ lib/Simple.pm # based on name parameter
+ t/basic.t
+
+The C<reset> method re-initializes the object as if it were generated
+from a fresh call to C<new>. It takes the same optional parameters as C<new>.
+
+ $dist->reset( name => 'Foo::Bar', xs => 0 );
+
+=head2 Adding and editing files
+
+Note that C<$filename> should always be specified with unix-style paths,
+and are relative to the distribution root directory, e.g. C<lib/Module.pm>.
+
+No changes are made to the filesystem until the distribution is regenerated.
+
+=head3 add_file()
+
+Add a $filename containing $content to the distribution.
+
+ $dist->add_file( $filename, $content );
+
+=head3 change_file()
+
+Changes the contents of $filename to $content. No action is performed
+until the distribution is regenerated.
+
+ $dist->change_file( $filename, $content );
+
+=head3 change_build_pl()
+
+A wrapper around change_file specifically for setting Build.PL. Instead
+of file C<$content>, it takes a hash-ref of Module::Build constructor
+arguments:
+
+ $dist->change_build_pl(
+ {
+ module_name => $dist->name,
+ dist_version => '3.14159265',
+ license => 'perl',
+ create_readme => 1,
+ }
+ );
+
+=head3 get_file
+
+Retrieves the target contents of C<$filename>.
+
+ $content = $dist->get_file( $filename );
+
+=head3 remove_file()
+
+Removes C<$filename> from the distribution.
+
+ $dist->remove_file( $filename );
+
+=head3 revert()
+
+Returns the object to its initial state, or given a $filename it returns that
+file to its initial state if it is one of the built-in files.
+
+ $dist->revert;
+ $dist->revert($filename);
+
+=head2 Changing the distribution directory
+
+These methods immediately affect the filesystem.
+
+=head3 regen()
+
+Regenerate all missing or changed files. Also deletes any files
+flagged for removal with remove_file().
+
+ $dist->regen(clean => 1);
+
+If the optional C<clean> argument is given, it also calls C<clean>. These
+can also be chained like this, instead:
+
+ $dist->clean->regen;
+
+=head3 clean()
+
+Removes any files that are not part of the distribution.
+
+ $dist->clean;
+
+=head3 remove()
+
+Changes back to the original directory and removes the distribution
+directory (but not the temporary directory set during C<new()>).
+
+ $dist = DistGen->new->chdir->regen;
+ # ... do some testing ...
+
+ $dist->remove->chdir_in->regen;
+ # ... do more testing ...
+
+This is like a more aggressive form of C<clean>. Generally, calling C<clean>
+and C<regen> should be sufficient.
+
+=head2 Changing directories
+
+=head3 chdir_in
+
+Change directory into the dist root.
+
+ $dist->chdir_in;
+
+=head3 chdir_original
+
+Returns to whatever directory you were in before chdir_in() (regardless
+of the cwd.)
+
+ $dist->chdir_original;
+
+=head2 Command-line helpers
+
+These use Module::Build->run_perl_script() to ensure that Build.PL or Build are
+run in a separate process using the current perl interpreter. (Module::Build
+is loaded on demand). They also ensure appropriate naming for operating
+systems that require a suffix for Build.
+
+=head2 Properties
+
+=head3 name()
+
+Returns the name of the distribution.
+
+ $dist->name: # e.g. Foo::Bar
+
+=head3 dirname()
+
+Returns the directory where the distribution is created.
+
+ $dist->dirname; # e.g. t/_tmp/Simple
+
+=head2 Functions
+
+=head3 undent()
+
+Removes leading whitespace from a multi-line string according to the
+amount of whitespace on the first line.
+
+ my $string = undent(" foo(\n bar => 'baz'\n )");
+ $string eq "foo(
+ bar => 'baz'
+ )";
+
+=cut
+
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