jekyll_outline
jekyll_outline
Jekyll tag plugin that creates a clickable table of contents.
Usage
These examples are taken from demo/index.html
.
Sort by order
field:
{% outline attribution fields="<b> title </b> – <i> description </i>" stuff %}
000: A Topic 0..19
020: A Topic 20..39
040: A Topic 40..
{% endoutline %}
Sort by title
field:
{% outline attribution sort_by_title fields="<b> title </b> – <i> description </i>" stuff %}
000: B Topic 0..19
020: B Topic 20..39
040: B Topic 40..
{% endoutline %}
Installation
Add the following line to your Jekyll project's Gemfile, within the jekyll_plugins
group:
group :jekyll_plugins do
gem 'jekyll_outline'
end
And then execute:
$ bundle
Fields
By default, each displayed entry consists of a document title, wrapped within an <a href> HTML tag that links to the page for that entry, followed by an indication of whether the document is visible (a draft) or not.
Entry can also include following fields:
draft
, categories
, description
, date
, last_modified
or last_modified_at
, layout
, order
, title
, slug
,
ext
, tags
, and excerpt
.
Specify the fields like this:
{% outline fields="title – <i> description </i>" %}
000: Topic 0..19
020: Topic 20..39
040: Topic 40..
{% endoutline %}
Words that are not a known field are transcribed into the output.
In the above example, notice that the HTML is space delimited from the field names. The parser is simple and stupid: each token is matched against the known keywords. Tokens are separated by white space.
CSS
The CSS used for the demo website should be copied to your project.
See the sections of
demo/assets/css/styles.css
as shown:
/* Start of jekyll_plugin_support css */
... copy this portion ...
/* End of jekyll_plugin_support css */
/* Start of jekyll_outline css */
... copy this portion ...
/* End of jekyll_outline css */
JavaScript
This project's outline_js
tag returns the Javascript necessary to position images relating to the outline.
If used without parameters it just returns the JavaScript.
Use the tag this way:
<script>
{%= outline_js %}
</script>
If passed the wrap_in_script_tag
parameter, it wraps the JavaScript in <script></script>
.
Use the tag this way:
{% outline_js wrap_in_script_tag %}
Explanation
Given an outline that looks like this:
{% outline stuff %}
000: Topic 0..19
020: Topic 20..39
040: Topic 40..
{% endoutline %}
...and given pages in the stuff
collection with the following names:
010-published.html
has title Published Stuff Post 010020-unpublished.html
has title Unpublished Post 020030-unpublished.html
has title Unpublished Post 030
Then links to the pages in the stuff
collection's pages are interleaved into the generated outline like this:
<div class="outer_posts">
<h3 class='post_title clear' id="title_0">Topic 0..19</h3>
<div id='posts_wrapper_0' class='clearfix'>
<div id='posts_0' class='posts'>
<span>2022-04-01</span> <span><a href='/stuff/010-published.html'>Published Stuff Post 010</a></span>
<span>2022-04-17</span> <span><a href='/stuff/020-unpublished.html'>Unpublished Post 020</a> <i class='jekyll_draft'>Draft</i></span>
</div>
</div>
<h3 class='post_title clear' id="title_20">Topic 20..39</h3>
<div id='posts_wrapper_20' class='clearfix'>
<div id='posts_20' class='posts'>
<span>2022-04-17</span> <span><a href='/stuff/030-unpublished.html'>Unpublished Post 030</a> <i class='jekyll_draft'>Draft</i></span>
</div>
</div>
</div>
The JavaScript searches for images in the current page that were created by the
img
tag plugin,
and have id
s that correspond to outline sections.
Each of following image's id
s have an outline_
prefix, followed by a number, which corresponds to one of the sections.
Note that leading zeros in the first column above are not present in the id
s below.
If you want to provide images to embed at appropriate locations within the outline,
wrap them within an invisible div
so the web page does not jump around as the images are loaded.
<div style="display: none;">
{% img align="right"
id="outline_0"
size="quartersize"
src="/assets/images/porcelain_washbasin.webp"
style="margin-top: 0"
wrapper_class="clear"
%}
{% img align="right"
id="outline_20"
size="quartersize"
src="/assets/images/pipes.webp"
style="margin-top: 0"
wrapper_class="clear"
%}
{% img align="right"
id="outline_40"
size="quartersize"
src="/assets/images/libgit2.webp"
style="margin-top: 0"
wrapper_class="clear"
%}
</div>
The JavaScript identifies the images and repositions them in the DOM such that they follow the appropriate heading. If no image corresponds to a heading, no error or warning is generated. The images can be located anywhere on the page; they will be relocated appropriately. If an image does not correspond to a heading, it is deleted.
Attribution
See jekyll_plugin_support
for attribution
Additional Information
More information is available on Mike Slinn’s website.
Development
After checking out the repo, run bin/setup
to install development dependencies.
Then you can run bin/console
for an interactive prompt that will allow you to experiment using irb
.
Build and Install Locally
To build and install this gem onto your local machine, run:
$ bundle exec rake install
jekyll_outline 0.1.0 built to pkg/jekyll_outline-0.1.0.gem.
jekyll_outline (0.1.0) installed.
$ gem info jekyll_outline
*** LOCAL GEMS ***
jekyll_outline (0.1.0)
Author: Mike Slinn
Homepage:
https://github.com/mslinn/jekyll_outline
License: MIT
Installed at: /home/mslinn/.gems
Generates Jekyll logger with colored output.
Demo
A demo / test website is provided in the demo
directory.
It can be used to debug the plugin or to run freely.
Run Freely
- Run from the command line:
$ demo/_bin/debug -r
- View the generated website at
http://localhost:4444
Plugin Debugging
Set breakpoints in Visual Studio Code.
Initiate a debug session from the command line:
$ demo/_bin/debug
- Once the
Fast Debugger
signon appears, launch the Visual Studio Code launch configuration calledAttach rdebug-ide
. - View the generated website at
http://localhost:4444
Release
To release a new version,
- Update the version number in
version.rb
. - Describe the changes in
CHANGELOG.md
. - Commit all changes to git; if you don't the next step might fail with an unexplainable error message.
Run the following:
$ bundle exec rake release
The above creates a git tag for the version, commits the created tag, and pushes the new
.gem
file to RubyGems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/mslinn/jekyll_outline.
- Fork the project
- Create a descriptively named feature branch
- Add your feature
- Submit a pull request
License
The gem is available as open source under the terms of the MIT License.