---
name: "Mojolicious::Plugin::AssetPack::Pipe"
section: "3pm"
platform: "linux"
package: "libmojolicious-plugin-assetpack-perl"
version: "2.15-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Mojolicious::Plugin::AssetPack::Pipe"
---

# Mojolicious::Plugin::AssetPack::Pipe(3pm)

Base class for a pipe

## NAME

Mojolicious::Plugin::AssetPack::Pipe - Base class for a pipe

## SYNOPSIS

### Write a custom pipe

```
  package MyApp::MyCoolPipe;
  use Mojo::Base "Mojolicious::Plugin::AssetPack::Pipe";
  use Mojolicious::Plugin::AssetPack::Util qw(diag DEBUG);
  sub process {
    my ($self, $assets) = @_;
    # Normally a Mojolicious::Plugin::AssetPack::Store object
    my $store = $self->assetpack->store;
    # Loop over Mojolicious::Plugin::AssetPack::Asset objects
    $assets->each(
      sub {
        my ($asset, $index) = @_;
        # Skip every file that is not css
        return if $asset->format ne "css";
        # Change $attr if this pipe will modify $asset attributes
        my $attr    = $asset->TO_JSON;
        my $content = $asset->content;
        # Private name to load/save meta data under
        $attr->{key} = "coolpipe";
        # Return asset if already processed
        if ($content !~ /white/ and $file = $store->load($attr)) {
          return $asset->content($file);
        }
        # Process asset content
        diag q(Replace white with red in "%s".), $asset->url if DEBUG;
        $content =~ s!white!red!g;
        $asset->content($store->save(\$content, $attr))->minified(1);
      }
    );
  }
```

### Use the custom pipe

```
  use Mojolicious::Lite;
  plugin AssetPack => {pipes => [qw(MyApp::MyCoolPipe Css)]};
```

Note that the above will not load the other default pipes, such as Mojolicious::Plugin::AssetPack::Pipe::JavaScript.

## DESCRIPTION

This is the base class for all pipe classes.

## ATTRIBUTES

### assetpack

```
  $obj = $self->assetpack;
```

Holds a Mojolicious::Plugin::AssetPack object.

### topic

```
  $str = $self->topic;
  $self = $self->topic("app.css");
```

Returns the name of the current asset topic.

## METHODS

### after\_process

```
  $self->after_process(Mojo::Collection->new);
```

"process" in Mojolicious::Plugin::AssetPack will call this method before any of the pipe "process" method is called.

Note that this method is not defined in Mojolicious::Plugin::AssetPack::Pipe!

### app

```
  $obh = $self->app;
```

Returns the Mojolicious application object.

### before\_process

```
  $self->before_process(Mojo::Collection->new);
```

"process" in Mojolicious::Plugin::AssetPack will call this method after all of the pipes "process" method is called.

Note that this method is not defined in Mojolicious::Plugin::AssetPack::Pipe!

### process

```
  $self->process(Mojo::Collection->new);
```

A method used to process the assets. Each of the element in the collection will be a Mojolicious::Plugin::AssetPack::Asset object or an object with the same API.

This method need to be defined in the subclass.

### run

```
  $self->run([som_app => @args], \$stdin, \$stdout, ...);
```

See "run3" in IPC::Run3 for details about the arguments. This method will try to call `_install_some_app()` unless "som\_app" was found in PATH. This method could then try to install the application and must return the path to the installed application.

## SEE ALSO

- •

  Mojolicious::Plugin::AssetPack

- •

  Mojolicious::Plugin::AssetPack::Asset

- •

  Mojolicious::Plugin::AssetPack::Store

- •

  Mojolicious::Plugin::AssetPack::Util