CODEWITHSUNDEEP
substringhugogo-templates
TomOnTime
TomOnTime

Reputation: 4487

How to trim a string in Hugo templates

I always create my posts with filenames that begin with "0001-", "0002-", etc. I'd like the default title to strip that off.

In the file themes/Hugo-Octopress/./archetypes/post.md I changed:

---
title: "{{ replace .TranslationBaseName "-" " " | title }}"

to

---
title: "{{ replace .TranslationBaseName "-" " " | substr 6 | title }}"

I thought that this would pipe the title through "substr 6" which would remove the first 5 chars from the file.

However the error message that I got was this:

Error: Failed to process archetype file "[redacted]/themes/Hugo-Octopress/archetypes/post.md": template: post:2:50: executing "post" at <substr 6>: error calling substr: start argument must be integer

How do I strip off the first 5 chars of a string in a template pipeline?

Upvotes: 1

Views: 2710

Answers (2)

KTamas
KTamas

Reputation: 466

The solution is to wrap your replace in parens and give that as a parameter to substr, like this:

title: "{{ substr (replace .TranslationBaseName "-" " ") 11 | title }}"

I tested it and this work for me.

(source: https://discourse.gohugo.io/t/how-to-trim-and-truncate-a-url/2639/3)

Upvotes: 2

ttntm
ttntm

Reputation: 1

As far as I have experienced, Hugo doesn't process any functions in *.md files normally, so you'd have to use "Shortcodes" - see those two for further information:

I'm quite sure though that I read somewhere that these don't work in front matter, i.e. the "title" parameter.

For my posts, which are also numbered, I have resorted to the "slug" parameter:

001-post-title.md

+++
title = "post title"
weight = "-999"
slug = "post title"
image = "fancy.jpg"
+++

Using this parameter, the permalink looks like this in my case: 

http://localhost:1313/post/post-title/

I know that this means manual typing and also may be a source of errors, but it's the easiest way around this issue I could find when I wanted a solution. Maybe there's a better answer if you ask the same thing in the Hugo forums.

Upvotes: 0

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