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275e1c0d23
Emphasizing to people (like me) who aren't familiar with Go that just because something's not mentioned in the Hugo docs doesn't mean it's not possible
138 lines
3 KiB
Markdown
138 lines
3 KiB
Markdown
---
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aliases:
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- /layout/functions/
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date: 2013-07-01
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linktitle: Functions
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menu:
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main:
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parent: layout
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next: /templates/variables
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prev: /templates/go-templates
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title: Hugo Template Functions
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weight: 20
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---
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Hugo uses the excellent Go html/template library for its template engine.
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It is an extremely lightweight engine that provides a very small amount of
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logic. In our experience it is just the right amount of logic to be able
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to create a good static website.
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Go templates are lightweight but extensible. Hugo has added the following
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functions to the basic template logic.
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(Go itself supplies built-in functions, including comparison operators
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and other basic tools; these are listed in the
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[Go template documentation](http://golang.org/pkg/text/template/#hdr-Functions).)
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## General
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### isset
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Return true if the parameter is set.
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Takes either a slice, array or channel and an index or a map and a key as input.
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e.g. {{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }}
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### echoParam
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If parameter is set, then echo it.
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e.g. {{echoParam .Params "project_url" }}
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### eq
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Return true if the parameters are equal.
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e.g.
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{{ if eq .Section "blog" }}current{{ end}}"
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### first
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Slices an array to only the first X elements.
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Works on [lists](/templates/list/), [taxonomies](/taxonomies/displaying/), [terms](/templates/terms/), [groups](/templates/list/)
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e.g.
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{{ range first 10 .Data.Pages }}
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{{ .Render "summary"}}
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{{ end }}
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### where
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Filters an array to only elements containing a matching value for a given field.
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Works on [lists](/templates/list/), [taxonomies](/taxonomies/displaying/), [terms](/templates/terms/), [groups](/templates/list/)
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e.g.
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{{ range where .Data.Pages "Section" "post" }}
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{{ .Content}}
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{{ end }}
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*where and first can be stacked*
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e.g.
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{{ range first 5 (where .Data.Pages "Section" "post") }}
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{{ .Content}}
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{{ end }}
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## Math
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### add
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Adds two integers.
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e.g. {{add 1 2}} → 3
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### sub
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Subtracts two integers.
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e.g. {{sub 3 2}} → 1
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### div
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Divides two integers.
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e.g. {{div 6 3}} → 2
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### mul
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Multiplies two integers.
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e.g. {{mul 2 3}} → 6
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### mod
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Modulus of two integers.
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e.g. {{mod 15 3}} → 0
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### modBool
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Boolean of modulus of two integers.
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true if modulus is 0.
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e.g. {{modBool 15 3}} → true
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## Strings
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### urlize
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Takes a string and sanitizes it for usage in URLs, converts spaces to "-".
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e.g. <a href="/tags/{{ . | urlize }}">{{ . }}</a>
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### safeHtml
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Declares the provided string as "safe" so Go templates will not filter it.
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e.g. {{ .Params.CopyrightHTML | safeHtml }}
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### lower
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Convert all characters in string to lowercase.
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e.g. {{lower "BatMan"}} → "batman"
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### upper
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Convert all characters in string to uppercase.
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e.g. {{upper "BatMan"}} → "BATMAN"
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### title
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Convert all characters in string to titlecase.
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e.g. {{title "BatMan"}} → "Batman"
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### highlight
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Take a string of code and a language, uses Pygments to return the syntax
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highlighted code in HTML. Used in the [highlight shortcode](/extras/highlighting).
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