jekyll_begin_end

This Jekyll plugin defines the following filters:

• begins_with — returns true if a string starts with the given substring.
• does_not_begin_with — returns false if a string starts with the given substring.
• ends_with — returns true if a string end with the given substring.
• does_not_end_with — returns false if a string ends with the given substring.
• append_suffix_if_does_not_start_with — appends a suffix to the given string if the string does not start with a given substring.

Add this line to your Jekyll project's Gemfile:

group :jekyll_plugins do
  gem 'jekyll_begin_end'
end

And then execute:

$ bundle

⚠️ Important: the name of each of these filters must be followed by a colon (:). If you fail to do that an error will be generated and the Jekyll site building process will halt. The error message looks something like this: Liquid Warning: Liquid syntax error (line 285): Expected end_of_string but found string in "{{ lines | begins_with 'blah' | xml_escape }}" in /some_directory/some_files.html Liquid Exception: Liquid error (line 285): wrong number of arguments (given 1, expected 2) in /some_directory/some_file.html Error: Liquid error (line 285): wrong number of arguments (given 1, expected 2)

First example:

{% assign url = "https:/asdf.com" %}
{% assign isAbsolute = url | begins_with: 'http' %}

Second example:

{% assign url = "https:/asdf.com" %}
{% if url | begins_with: 'http' %}
  <p>Absolute</p>
{% else %}
  <p>Relative</p>
{% endif %}

First example:

{% assign url = "https:/asdf.com" %}
{% assign isRelative = url | does_not_begin_with: 'http' %}

Second example

{% assign url = "https:/asdf.com" %}
{% if url | does_not_begin_with: 'http' %}
  <p>Relative</p>
{% else %}
  <p>Absolute</p>
{% endif %}

First example:

{% assign url = "https:/asdf.com" %}
{% assign isDotCom = url | ends_with: '.com' %}

Second example:

{% assign url = "https:/asdf.com" %}
{% if url | ends_with: '.com' %}
  <p>.com found</p>
{% else %}
  <p>Not a .com</p>
{% endif %}

First example:

{% assign url = "https:/asdf.com" %}
{% assign isNotDotCom = url | does_not_end_with: '.com' %}

Second example:

{% assign url = "https:/asdf.com" %}
{% if url | does_not_end_with: '.com' %}
  <p>Not a .com</p>
{% else %}
  <p>.com found</p>
{% endif %}

This filter was created to make asset reloading work better.

Given a portion of _layouts/default.html that looks like this:

{% assign csses = page.css | default: layout.css %}
{% assign nowMillis = site.time | date: '%s' %}
{% assign suffix = '?v=' | append: nowMillis %}
{% for css in csses %}
  <link rel="stylesheet" href="{{ css | append_suffix_if_does_not_start_with: 'http', suffix }}" type="text/css">
{% endfor %}

And given index.html with front matter that looks like this:

---
css: [
  https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.css,
  /order/order.css
]
---

The following is generated. Note that the suffix s?v=1612879301 in only applied to the relative URL for order.css.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.css" type="text/css">
<link rel="stylesheet" href="/order/order.css?v=1612879301" type="text/css">

More information is available about my Jekyll plugins.

After checking out the repo, run bin/setup to install dependencies.

Then you can run bin/console for an interactive prompt that will allow you to experiment using irb.

To build and install this gem onto your local machine, run:

$ bundle exec rake install

Examine the newly built gem:

$ gem info jekyll_begin_end

*** LOCAL GEMS ***

jekyll_begin_end (1.0.0)
    Author: Mike Slinn
    Homepage:
    https://github.com/mslinn/jekyll_begin_end
    License: MIT
    Installed at: /home/mslinn/.gems

    Generates Jekyll logger with colored output.

To release a new version,

1. Update the version number in version.rb.

2. Describe the changes in CHANGELOG.md.

3. Commit all changes to git; if you don't the next step might fail with an unexplainable error message.

4. 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.

Bug reports and pull requests are welcome on GitHub at https://github.com/mslinn/jekyll_begin_end.

1. Fork the project
2. Create a descriptively named feature branch
3. Add your feature
4. Submit a pull request

The gem is available as open source under the terms of the MIT License.