Mallard backend for AsciiDoc

Introduction

Mallard backend is a configuration file for Stuart Rackham’s AsciiDoc. It generates Mallard markup from AsciiDoc documents.

Installation

asciidoc --backend install mallard.zip

To remove this backend:

asciidoc --backend remove mallard

Backend specific features

Since Mallard lacks some of the features other AsciiDoc backends offer to you, some workaround has to be used to implement some useful functions (soure highlighting, math, footnotes, cross references) while other are simply ignored by this backend (style).

Important

If you want to use this backend to generate chunked files, sections' name or id can’t be index: id is used to name files and index is already utilised as name of the page that will be the root of all chunked files.

Source highlighting

Mallard’s <code> element with a proper mime attribute will highlight code according to its value.
In order to keep this backend compatible with other backends the source code block’s languages already available in this backend are:
java, delphi, pascal, ini, php, myxml, m2, tcl, c, cpp, csharp, python, ruby, perl, javascript, bourne, css, css21, cmake, upc, lua, sql92, sql1999, sql2003 and sql.

Style

Mallard doesn’t come out of the box with complex styling features interpreters should adhere to.
If you want to style text (color, size, ..), tables and so on, you have to use Mallard’s style attribute.

The style attribute takes a space-separated list of style hints. Processing tools should adjust their behavior according to those style hints they understand.

Because style relies on processing tools, as of right now, those style hints, are simply ignored by this backend.

Subscript/superscript & math

Mallard doesn’t have subscript, superscript and math-ability, so this backend renders them as plain text.
Instead you should use MathML with its external namespace in a passthrough macro or block. Here’s a couple of examples:

Passthrough macro example

ifdef::basebackend-mallard[]
pass:[<math xmlns="http://www.w3.org/1998/Math/MathML">
	<mrow>
		<mi>x</mi>
		<mo>=</mo>
		<mfrac>
			<mrow>
				<mrow>
					<mo>-</mo>
					<mi>b</mi>
				</mrow>
				<mo>±</mo>
				<msqrt>
					<mrow>
						<msup>
							<mi>b</mi>
							<mn>2</mn>
						</msup>
						<mo>-</mo>
						<mrow>
							<mn>4</mn>
							<mo>&#x02062;</mo>
							<mi>a</mi>
							<mo>&#x02062;</mo>
							<mi>c</mi>
						</mrow>
					</mrow>
				</msqrt>
			</mrow>
			<mrow>
				<mn>2</mn>
				<mo>&#x02062;</mo>
				<mi>a</mi>
			</mrow>
		</mfrac>
	</mrow>
</math>]
endif::basebackend-mallard[]

Passthrough block example

ifdef::basebackend-mallard[]
++++
<math xmlns="http://www.w3.org/1998/Math/MathML">
	<mrow>
		<mi>x</mi>
		<mo>=</mo>
		<mfrac>
			<mrow>
				<mrow>
					<mo>-</mo>
					<mi>b</mi>
				</mrow>
				<mo>±</mo>
				<msqrt>
					<mrow>
						<msup>
							<mi>b</mi>
							<mn>2</mn>
						</msup>
						<mo>-</mo>
						<mrow>
							<mn>4</mn>
							<mo>&#x02062;</mo>
							<mi>a</mi>
							<mo>&#x02062;</mo>
							<mi>c</mi>
						</mrow>
					</mrow>
				</msqrt>
			</mrow>
			<mrow>
				<mn>2</mn>
				<mo>&#x02062;</mo>
				<mi>a</mi>
			</mrow>
		</mfrac>
	</mrow>
</math>
++++
endif::basebackend-mallard[]

Footnotes

Mallard doesn’t have footnotes, so this backend render them inline like this:

footnote:[<text>]

[<text>]

footnoteref:[<id>,<text>]

[id. <text>]

footnoteref:[<id>]

[→ id]

Internal cross references

In Mallard only sections will generate an anchor.
So, if you want to use cross reference links, you have to give every section an unique id and then use that id to link to it.

Cross reference usage example

[[unique_id]]
My fabulous section
~~~~~~~~~~~~~~~~~~~
Nel mezzo del cammin di nostra vita +
mi ritrovai per una selva oscura, +
ché la diritta via era smarrita.

 ...

Uh-oh! I want to link to that fabulous <<unique_id,section>>!

Options

Apart from other AsciiDoc attributes, Mallard document generation is influenced by the following attributes:

chunked[=LEVEL]

If chunked attribute is used, Mallard documents will be split up in pages according to its level (see Examples).

Important

If you want to use this backend to generate chunked files, sections' name or id can’t be index: id is used to name files and index is already utilised as name of the page that will be the root of all chunked files.

Available levels are:

1	Section level 1
2	Section level 2
3	Section level 3
4	Section level 4
s	Synopsis section (only manpage documents)

If chunked attribute is used wihout a LEVEL the backend will use a LEVEL of 1234 (all sections, apart from synopsis, will be split up in new pages)

Important

The file generated with attribute chunked needs to be further massaged by chunkenizer(1) bash script, so that it can be split up in different files and undergo some other small adjustments.

toc

Put a table of content in the main page (only of level1 sections) and in each sections (only of direct children sections).

yelp

Same-page cross reference links workaround for Gnome’s Yelp: also cross links towards same page’s sections will have page’s name [e.g.: page#sect] (Not chunked only, for chunked documents the workaround is handled by chunkenizer(1))

Examples

Split up all the document’s sections (apart from synopsis) in new pages:

asciidoc -b mallard -a chunked INPUTFILE

Split only section of level 1:

asciidoc -b mallard -a chunked=1 INPUTFILE

Split section 1 and 3:

asciidoc -b mallard -a chunked=13 INPUTFILE

Split all document’s sections and synopsis:

asciidoc -b mallard -a chunked=1234s INPUTFILE

Split section of level 1 and synopsis:

asciidoc -b mallard -a chunked=1s INPUTFILE

Yelp workaround:

asciidoc -b mallard -a yelp INPUTFILE

Author

Daniele Pezzini <[email protected]>

Copying

Copyright © 2013 Daniele Pezzini. Free use of this software is granted under the terms of the MIT License (MIT).