Raku Land

Pod::To::PDF

zef:dwarring

TITLE

Pod::To::PDF

SUBTITLE

Render Pod to PDF via Cairo

Usage

From command line:

$ raku --doc=PDF lib/to/class.rakumod | xargs evince

From Raku:

use Pod::To::PDF;
use Cairo;

=NAME
foobar.pl

=head2 SYNOPSIS
=code foobar.pl <options> files ...

my Cairo::Surface::PDF $pdf = pod2pdf($=pod, :pdf-file<foobar.pdf>);
$pdf.finish();

Exports

class Pod::To::PDF; sub pod2pdf; # See below

From Raku code, the pod2pdf function returns a Cairo::Surface::PDF object which can be further manipulated, or finished to complete rendering.

Description

This module renders Pod to PDF documents via Cairo.

The generated PDF has a table of contents and is tagged for accessibility and testing purposes.

It uses HarfBuzz for font shaping and glyph selection and FontConfig for system font loading.

Subroutines

sub pod2pdf()

sub pod2pdf(
    Pod::Block $pod
) returns Cairo::Surface::PDF;

pod2pdf() Options

Str() :$pdf-file

A filename for the output PDF file.

Cairo::Surface::PDF :$surface

A surface to render to

UInt:D :$width, UInt:D :$height

The page size in points (there are 72 points per inch).

UInt:D :$margin

The page margin in points

Hash :@fonts

By default, Pod::To::PDF loads system fonts via FontConfig. This option can be used to preload selected fonts.

use Pod::To::PDF;
use Cairo;
my @fonts = (
    %(:file<fonts/Raku.ttf>),
    %(:file<fonts/Raku-Bold.ttf>, :bold),
    %(:file<fonts/Raku-Italic.ttf>, :italic),
    %(:file<fonts/Raku-BoldItalic.ttf>, :bold, :italic),
    %(:file<fonts/Raku-Mono.ttf>, :mono),
);

my Cairo::Surface::PDF $pdf = pod2pdf($=pod, :@fonts, :pdf-file<out.pdf>);
$pdf.finish();

Each font entry should have a file entry and various combinations of bold, italic and mono flags. Note that mono is used to render code blocks and inline code.

Str :%metadata

This can be used to preset values for title, subtitle, name, author or version.

This is an alternative to, and will override =TITLE, =SUBTITLE, =NAME, =AUTHOR or =VERSION directives.

Note: All of these are options are provided for compatibility, however only =TITLE and =AUTHOR are directly supported in PDF metadata.

:!contents

Disables Table of Contents generation.

:!index

Disable writing of a Index section to the table of contents.

:$linker

Provides a class or object to intercept and sanitise or rebase links. The class/object should provide a method resolve-link that accepts the target component of C<L<>> formatting codes and returns the actual link to be embedded in the PDF. The link is omitted, if the method returns an undefined value.

:%replace

Specify replacements for R<> placeholders in the POD. Replacement values should be simple strings (Str), Pod blocks (type Pod::Block), or a List. For example:

use Pod::To::PDF;
my $title = 'Sample Title';
my Str() $date = now.Date;
my $author = 'David Warring';
my $description = "sample Pod with replaced content";
my %replace = :$date, :$title, :$author, :$description;
my $renderer = pod2pdf($=pod, :%replace, :pdf-file<replace-example.pdf>);
$renderer.finish(); 

=begin pod
=TITLE R<title>
=AUTHOR R<author>
=DATE R<date>
=head2 Description
=para R<description>;
=end pod

Installation

This module's dependencies include HarfBuzz, Font::FreeType, FontConfig and Cairo, which further depend on native harfbuzz, freetype6, fontconfig and cairo libraries.

Please check these module's installation instructions.

Testing

Note that installation of the PDF::Tags::Reader module enables structural testing.

For example, to test this module from source.

$ git clone https://github.com/dwarring/Pod-To-PDF-raku
$ cd Pod-To-PDF-raku
$ zef install PDF::Tags::Reader # enable structural tests
$ zef APP::Prove6
$ zef --deps-only install .
$ prove6 -I .