Pageling/Manual/manual.pod

=encoding utf8

=head1 PAGELING

This is a manual for Pageling, a basic website assembler.

© 2019 Tirifto

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License".

=for REUSE
SPDX-Licence-Identifier: GFDL-1.3-or-later

=head2 Configuration files

Pageling's configuration files use a custom, but simple format, called
‘Paliya’. All of them should therefore use the filename extension ‘.paliya’.

=head3 The Paliya configuration format

Each configuration file contains a sequence of keywords and their values, which
will be loaded into the program. Keyword is a simple word, and its value is
written right after it, within braces, like so:

    keyword{the keyword's value}

A keyword may contain any characters, save for whitespace and braces
(‘{’ or ‘}’.)

The value is delemited by braces (‘{’ and ‘}’), and must come immediately after
its keyword, with no whitespace in-between. Everything within the braces will be
loaded as-is, save for the closing brace (‘}’) and the backslash (‘\’).

Instead of a backslash, the following character is loaded as-is. Therefore, if
you need ‘}’ in your value, you must write ‘\}’ instead. If you want ‘\’, you
must write ‘\\’.

Individual keyword/value pairs may be separated from each other by whitespace,
but don't need to be. For clarity, it is recommended that each keyword start on
a new line.

Here is a hypothetical example file, to demonstrate the structure:

    key1{keyhole1}
    key2{
    keyhole2
    }key3{{[(keyhole3)]\}}

This file would contain three keywords, linked to three values:

=over

=item

C<key1> has the text C<keyhole1>.

=item

C<key2> has the text C<keyhole2> with one leading and one trailing newline.

=item

C<key3> has the text C<keyhole3> within round brackets within square brackets
within braces.

=back

See the documentation of individual configuration files to see some practical
and functional examples.

=head3 Special placeholders

A configuration file may have its own set of special placeholders. Those are
words wrapped in <<<triple broken brackets>>>, which Pageling is going to
replace with a context-dependent value. See each file's individual documentation
for the special placeholders it has (if it has any).

=head3 languages.paliya

Keys represent language codes, and values represent their names.

In practice, codes are used to identify the languages within Pageling files (so
it's practical to keep them short but memorable), while names will be presented
in the language switcher.

You may, for instance, like to use the L<ISO 639-3
standard|https://iso639-3.sil.org/> for language codes, and each language's name
in the language itself for the name. You may also insert the image of a flag
using HTML (or whatever markup language you use for your website).

Example F<languages.paliya> file:

    eng{English}
    epo{Esperanto (lingvo internacia)}
    heb{עברית}
    jpn{日本語}
    rus{русский}

=head3 switcher.paliya

Keys represent component names, and the associated values hold the components'
content.

A component represents a certain part of the language switcher. When the
switcher is constructed (in order to replace the switcher placeholder), it is
assembled purely from the components specified in this configuration file, so
its appearance is quite configurable.

Mandatory components are:

=over

=item C<thisitem>

Currently selected language item.

=item C<otheritem>

Other language item.

=item C<separator>

A separator to be inserted between every two neighbouring items.

=back

Custom placeholders are:

=over

=item <<<CODE>>>

Code of the language being processed for the given item.

=item <<<NAME>>>

Name of the language being processed for the given item.

=item <<<URL>>>

Uniform Resource Locator (link) of the page in the language being processed.

=back

Example F<switcher.paliya> file:

    thisitem{<<<NAME>>>}
    otheritem{<a href="<<<URL>>>"><<<NAME>>><\\a>}
    separator{ | }

=head3 navigation.paliya

Keys consist of two unseparated parts: depth level and component name. The value
then holds the given component for the given depth level.

The navigation tool is assembled from the components defined in this file, much
like switcher from L</switcher.paliya>. However, the navigation tool can have
multiple I<layers>.

Layers respond to depth level in the website's directory tree. The more ancestor
directories a file has, the greater its depth level. For instance, see this
example directory tree, where the input directory is called ‘INPUT’:

=over

=item

F<INPUT> has the depth 0.

=item

F<INPUT/index.html> and F<INPUT/contact.html> have the depth 1.

=item

F<INPUT/photos/asia.html> and F<INPUT/music/scores.html> have the depth 2.

=item

F<INPUT/music/recordings/index.html> has the depth 3.

=back

Each depth level can have its unique set of components, which will be used when
constructing the appropriate navigation layer.

The navigation tool will include layers for the depth level of the given file
(in the last place), plus all the upper (lower-number) depth levels. Essentially
this means that each file's navigation tool is an extension of its parent's
navigation tool, with a new layer of navigation. (That is, up until detph level
1.)

How many depth levels you cover is up to you, but for each of them, you must
provide all of these components (with a leading depth level number):

=over

=item C<start>

Placed at the beginning of the layer.

=item C<thisitem>

Represents the current page.

=item C<otheritem>

Represents any other page.

=item C<parentitem>

Represents the current page's direct ancestor (parent, grandparent…).

=item C<separator>

Placed in between every two neighbouring items.

=item C<end>

Placed at the end of the layer.

=back

In their values, you may use hese placeholders:

=over

=item <<<TITLE>>>

Represents the page's title.

=item <<<URL>>>

Represents the page's Uniform Resource Locator (link).

=back

This is what an example F<navigation.paliya> file could look like:

    1start{☙ }
    1thisitem{*<<<TITLE>>>*}
    1otheritem{<a href="<<<URL>>>"><<<TITLE>>><\\a>}
    1parentitem{_<a href="<<<URL>>>"><<<TITLE>>><\\a>_}
    1separator{ || }
    1end{ ❧<br>
    }
    2start{❦ }
    2thisitem{*<<<TITLE>>>*}
    2otheritem{<a href="<<<URL>>>"><<<TITLE>>><\\a>}
    2parentitem{_<a href="<<<URL>>>"><<<TITLE>>><\\a>_}
    2separator{ | }
    2end{ ❦<br>
    }

=head2 Pageling files

Files with actual content to be exported by Pageling have their own format,
which is an extension of the Paliya format.

Pageling files are read line by line, and there are two kinds of lines:

=over

=item Content line

=item Directive line

=back

Content lines are exported as they are, in their entirety. They have no special
marking.

Directive lines, on the other hand, contain directives for Pageling to follow,
that is, actions it should perform at the given line. Each directive line must
start with a triple colon (‘:::’). What follows (after optional whitespace) must
be a valid L<Paliya|/The Paliya configuration format> key/value pair, which must
end on the same line. The key represents the directive given to Pageling, and
the value is passed on with it.

=head3 Directives

Here is a list of keywords which will be recognised as directives. Multiple
keywords separated by commas mark several possible alternatives. Descriptions
specify what the values ought to contain:

=over

=item lan, language, lin, lingvo

A language code to set the language for all following lines until another
directive of this kind is encountered.

This directive is B<essential> to include in a Pageling file, otherwise the
program will U<not> know where the content should go.

=item fil, file, dos, dosiero

Filename of the exported file. Path to the file shouldn't be included, for
Pageling will find the right path by itself.

=item tit, title, titolo

Title of the page in the given language, to replace the ‘<<<TITLE>>>’
placeholder.

=item nav, navigation, navigilo

Indicates that the file should be included in its parent's navigation bar. No
content necessary.

=item 

=back











=head2 GNU Free Documentation License

                GNU Free Documentation License
                 Version 1.3, 3 November 2008


 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
     <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
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If a section in the Document is Entitled "Acknowledgements",
"Dedications", or "History", the requirement (section 4) to Preserve
its Title (section 1) will typically require changing the actual
title.


9. TERMINATION

You may not copy, modify, sublicense, or distribute the Document
except as expressly provided under this License.  Any attempt
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will automatically terminate your rights under this License.

However, if you cease all violation of this License, then your license
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10. FUTURE REVISIONS OF THIS LICENSE

The Free Software Foundation may publish new, revised versions of the
GNU Free Documentation License from time to time.  Such new versions
will be similar in spirit to the present version, but may differ in
detail to address new problems or concerns.  See
https://www.gnu.org/licenses/.

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Document.

11. RELICENSING

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"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 
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somewhere other than this MMC, and subsequently incorporated in whole or 
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(2) were thus incorporated prior to November 1, 2008.

The operator of an MMC Site may republish an MMC contained in the site
under CC-BY-SA on the same site at any time before August 1, 2009,
provided the MMC is eligible for relicensing.


ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and
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    Copyright (c)  YEAR  YOUR NAME.
    Permission is granted to copy, distribute and/or modify this document
    under the terms of the GNU Free Documentation License, Version 1.3
    or any later version published by the Free Software Foundation;
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    A copy of the license is included in the section entitled "GNU
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If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
replace the "with...Texts." line with this:

    with the Invariant Sections being LIST THEIR TITLES, with the
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If you have Invariant Sections without Cover Texts, or some other
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If your document contains nontrivial examples of program code, we
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=cut