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title: Replace-Last Filter for Jekyll Liquid time: 2014.08.04 21:54:08 layout: post tags:

• Jekyll
• Liquid
• Filter
• GitHub shortUrl: http://goo.gl/tTyFjx excerpt: There are only <code>replace</code> and <code>replace-last</code> filter in Liquid gramma. So how can we replace the last character in Jekyll? This post introduces an ad-hoc method to do this, as well as how to make a <em>View Source on GitHub</em> feature.

What will you learn in this post?

There are only <code>replace</code> and <code>replace-last</code> filter in Liquid gramma. So how can we replace the last character in Jekyll? This post introduces an ad-hoc method to do this, as well as how to make a <em>View Source on GitHub</em> feature.

Why did I need this filter?

I was making a View Source in GitHub feature for my blog and needed to replace / with - in {{ "{{ page.url" }}}}, which is /2014/07/15/jekyll/related/posts/without/plugin/, so as to generate a link like https://raw.githubusercontent.com/Ovilia/blog/gh-pages/_posts/2014-07-15-jekyll-related-posts-without-plugin.md.

As we can see, https://raw.githubusercontent.com/Ovilia/blog/gh-pages/_posts/ and .md remains always the same. So we just need to get 2014-07-15-jekyll-related-posts-without-plugin from /2014/07/15/jekyll/related/posts/without/plugin/, which seems to be a piece of cake, right?

No! Not with Liquid.

replace and remove-first

Good Resource of Liquid Gramma

<a href="https://github.com/Shopify/liquid/wiki/Liquid-for-Designers#standard-filters" target="_blank">Standard Filters - Liquid for Designers</a>

We can use replace to replace / with -. But we want to get rid of the first and last / in /2014/07/15/jekyll/related/posts/without/plugin/. The first / can be easily removed using remove-first, but how about the last one?

Apparently, there's no Liquid filter we can use. But you have to do something to stay alive with Liquid. :smirk:

append?!

As traditional Chinese philosophy told us, One must first give, when he wants to get. When we can't find any solution to remove, why not consider append?

One must first open, when he wants to close.
One must first strengthen it, when he wants to weaken something.
One must first embrace, when he wants to abolish.
One must first give, when he wants to get.

from Tao Te Ching

We first append a character which is considered never to be in the post URL. For example, we choose @ here and put our trust on it that it will never betray us. :joy:

Append @ to the end of the string and remove -@ helps to remove the last - in the original string.

The complete code is: