MathJax processor ignores files with only $$ (display notation) and text when optimization is enabled

[woodenbell]

As the title says, when running the server with the latest version of the plugin (0.9.6) with default configs (optimize has enable: true for mathjax), the MathJax processor is only called on files which have either only mathjax display notation (text between pairs of $$) and no text or have the inline notation (pairs of $).

When using $$ and regular text or without $ in that same post, nothing happens.

Below are some screenshots of examples. Setting enable: false in the optimize config for MathJax seems to solve the issue.

The repository is available here.

[jeffreytse]

Hi @woodenbell

Thanks for your issue firstly. And currently the issue has been addressed.

The minimal test project Gemfile as below:

source "https://rubygems.org"
# Hello! This is where you manage which Jekyll version is used to run.
# When you want to use a different version, change it below, save the
# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
#
#     bundle exec jekyll serve
#
# This will help ensure the proper Jekyll version is running.
# Happy Jekylling!
gem "jekyll", "~> 4.1.1"
# This is the default theme for new Jekyll sites. You may change this to anything you like.
gem "minima", "~> 2.5"
# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
# uncomment the line below. To upgrade, run `bundle update github-pages`.
# gem "github-pages", group: :jekyll_plugins
# If you have any plugins, put them here!
group :jekyll_plugins do
  gem "jekyll-feed", "~> 0.12"
end

# Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
# and associated library.
platforms :mingw, :x64_mingw, :mswin, :jruby do
  gem "tzinfo", "~> 1.2"
  gem "tzinfo-data"
end

# Performance-booster for watching directories on Windows
gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]

gem "jekyll-spaceship", "0.9.6"

The issue could be summarized as below:

1. The post content has only $$..$$ mathjax expression and no any other content (Normal):

$$ 2 - 1 = 1 $$

$$ 2 - 1 = 1 $$

$$ 2 - 1 = 1 $$

2. The post content has only $$..$$ mathjax expression and any other content (Abnormal):

$$ 2 - 1 = 1 $$

Here is pure text.

$$ 2 - 1 = 1 $$

<!-- Here is pure text. -->

$$ 2 - 1 = 1 $$

$$ 3 - 1 = 2 $$

<!-- Here is pure text. -->

3. The post content has only one $$..$$ and any other patterns ($..$, \\\[...\\\], etc.) of mathjax expressions (Normal):

\\\( 2 - 1 = 1 \\\)

$$ 2 - 1 = 1 $$

\\\[2 - 1 = 1\\\]

$$ 2 - 1 = 1 $$

\\\[2 - 1 = 1\\\]

$$ 2 - 1 = 1 $$

Here is pure text.

Thanks and regards

[jeffreytse]

Hi @woodenbell

Now the issue has been fixed, and could you update it for your test?
For using gem directly from git repositories. In your Gemfile:

# To install a gem from its github repository
gem "jekyll-spaceship", git: "https://github.com/jeffreytse/jekyll-spaceship.git"

And then install gems again:

$ bundle install

Thanks and regards

[woodenbell]

Hi @jeffreytse
The issue has been fixed. Thanks a lot!