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bin/implode  view on Meta::CPAN

#!/usr/bin/env perl
package App::implode::cli;
use strict;
use warnings;
use Archive::Tar;
use Cwd 'abs_path';
use Carton ();
use Carton::Builder;
use Carton::Environment;
use Carton::Mirror;
use File::Basename 'basename';
use File::Find ();
use File::Path ();
use File::Spec::Functions qw( catdir catfile );
use File::Temp 'tempdir';
use IO::Compress::Bzip2;

our $PATH = abs_path(__FILE__);

sub DESTROY {
  my $self = shift;
  return chdir $self->[0] if UNIVERSAL::isa($self, 'ARRAY');
  File::Path::remove_tree($self->{tmpdir}) if $self->{cleanup} and $self->{tmpdir};
}

sub mirror { shift->{mirror} ||= Carton::Mirror->new($ENV{PERL_CARTON_MIRROR} || $Carton::Mirror::DefaultMirror) }
sub tmpdir { shift->{tmpdir} //= tempdir(CLEANUP => $ENV{IMPLODE_NO_CLEANUP} ? 0 : 1) }
sub verbose { shift->{verbose} //= $ENV{APP_IMPLODE_VERBOSE} ? 0 : -t STDOUT }

sub bundle {
  my $self     = shift;
  my $script   = $self->slurp($self->{script});
  my $exploder = $self->code('exploder');
  my $id       = basename $self->{out};

  $exploder =~ s!^sub.*\@_;!BEGIN{my \$id='$id';!s;
  $exploder =~ s!^\s+!!mg;
  $exploder =~ s!\n!!g;

  open my $OUT, '>', $self->{out} or die "Could not write $self->{out}: $!\n";
  warn sprintf "Generating $self->{out} with embedded bzip archive...\n" if $self->verbose;
  print $OUT $script =~ s/^(#!.+?[\r\n]+)//m ? $1 : "#!/usr/bin/perl\n";
  print $OUT $exploder, "\n", $script, "\n__END__\n";
  $self->tarball->write(IO::Compress::Bzip2->new($OUT), COMPRESS_GZIP);
  close $OUT;
  chmod 0755, $self->{out};
  warn sprintf "$self->{out} is generated.\n" if $self->verbose;
}

sub chdir {
  my $self = shift;
  my $guard = bless [abs_path], ref($self);
  chdir $_[0] or die "chdir $_[0]: $!";
  $guard;
}

sub code {
  my ($self, $name) = @_;
  open my $SELF, '<', $PATH or die "Read $PATH: $!";
  return join '', grep { /^sub $name/ .. /^\}/ } <$SELF>;
}

sub deps {
  my $self    = shift;
  my $env     = Carton::Environment->build('cpanfile', $self->tmpdir);
  my $builder = Carton::Builder->new(mirror => $self->mirror, cpanfile => $env->cpanfile);

  $self->dir_is_empty($self->tmpdir) or die "Cannot build $self->{script}: @{[$env->install_path]} already exists.\n";
  $self->{cleanup} = 1;
  $builder->install($env->install_path);
}

sub dir_is_empty {
  my ($self, $dir) = @_;
  opendir(my $DH, $dir) or return 1;
  not scalar grep {/\w/} readdir $DH;
}

sub exploder {
  my ($self, $id) = @_;
  require Archive::Tar;
  require File::Path;
  require File::Spec;
  require IO::Uncompress::Bunzip2;
  sub App::implode::temp::DESTROY { File::Path::remove_tree(${$_[0]}) }
  $App::implode::explodedir
    = bless \($ENV{APP_EXPLODE_DIR} || File::Spec->catdir(File::Spec->tmpdir, "app-implode-$id")), 'App::implode::temp';
  warn "[App::implode] cd $$App::implode::explodedir; tar -xfz $0\n" if $ENV{APP_EXPLODE_VERBOSE};
  my $tar = Archive::Tar->new;
  $tar->read(
    IO::Uncompress::Bunzip2->new(
      do {
        open my $FH, '<', $0;
        my $m = 0;
        \join '', grep { $m++ if /^__END__\r?\n/ || $m; $m > 1; } <$FH>;
        }
    )
  );
  $tar->setcwd($$App::implode::explodedir);
  $tar->extract or die "[App::implode] tar -xfz $0 failed: @{[$tar->error]}";
  unshift @INC, File::Spec->catdir($$App::implode::explodedir, 'lib', 'perl5');
  $ENV{PATH} = join ':', grep {defined} File::Spec->catdir($$App::implode::explodedir, 'bin'), $ENV{PATH};
  $ENV{PERL5LIB} = join ':', @INC;
}

sub slurp {
  my ($self, $file) = @_;
  open my $FH, '<', $file or die "Could not read $file: $!\n";
  local $/;
  readline $FH;
}

sub tarball {
  my $self  = shift;
  my $chdir = $self->chdir($self->tmpdir);
  my $chmod = sub { -f and chmod 0600 | (0777 & (stat _)[2]), $_ };
  my $files = sub { @_ > 1 and File::Find::find({no_chdir => 1, wanted => shift}, @_) };
  my $tar   = Archive::Tar->new;

  $files->(
    sub {
      return unless $chmod->();
      warn sprintf "Add @{[catfile $self->{tmpdir}, $_]}\n" if $self->verbose;
      $tar->add_files($_);
    },
    grep {-d} qw( bin lib )
  );

  undef $chdir;
  $files->(
    sub {
      return unless $chmod->() and s!lib!lib/perl5!;
      warn sprintf "Add $_\n" if $self->verbose;
      $tar->add_data($_, $self->slurp($File::Find::name));
    },
    grep {-d} qw( lib )
  );

  return $tar;
}

sub run {
  my $self = shift;

  $self->{script} = shift or die "Usage: implode myapp.pl [path/to/outfile.pl]\n\n";
  $self->{out} = shift || basename $self->{script};
  -r $self->{script} or die "Cannot read '$self->{script}'.\n";
  -e $self->{out} and die "Outfile '$self->{out}' already exists.\n";

  warn sprintf "Building application in %s\n", $self->tmpdir if $self->verbose;
  $self->deps;
  $self->bundle;

  return 0;
}

exit((bless {})->run(@ARGV)) unless defined wantarray;
no warnings;
'App::implode::cli';