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632 lines
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HTML
632 lines
21 KiB
HTML
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<meta name="description" content="Hugo uses the excellent Go html/template library for its template engine. It is an extremely lightweight engine that provides a very small amount of logic. In our experience that it is just the right amount of logic to be able to create a good static website. If you have used other template systems from different languages or frameworks you will find a lot of similarities in Go templates.
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This document is a brief primer on using Go templates.">
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<meta name="theme-color" content="#FFFFFF"><meta property="og:title" content="(Hu)go Template Primer" />
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<meta property="og:description" content="Hugo uses the excellent Go html/template library for its template engine. It is an extremely lightweight engine that provides a very small amount of logic. In our experience that it is just the right amount of logic to be able to create a good static website. If you have used other template systems from different languages or frameworks you will find a lot of similarities in Go templates.
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This document is a brief primer on using Go templates." />
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<meta property="og:url" content="https://books.halfrost.com/leetcode/posts/goisforlovers/" />
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<meta property="article:published_time" content="2014-04-02T00:00:00+00:00" />
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<meta property="article:modified_time" content="2014-04-02T00:00:00+00:00" />
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<title>(Hu)go Template Primer | LeetCode Cookbook</title>
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<a href="/leetcode"><span>LeetCode Cookbook</span>
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被人嘲笑的梦想
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<a href="https://github.com/halfrost" target="_blank" rel="noopener">
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Github
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Weibo
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<a href="/leetcode/docs/example/"><strong>Example Site</strong></a></p>
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<a href="/leetcode/docs/example/table-of-contents/">Table of Contents</a></p>
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<a href="/leetcode/docs/example/table-of-contents/with-toc/">With ToC</a></li>
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<a href="/leetcode/docs/example/table-of-contents/without-toc/">Without ToC</a></li>
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<a href="/leetcode/docs/example/collapsed/">Collapsed</a></p>
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<a href="/leetcode/docs/example/collapsed/3rd-level/">3rd</a>
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<a href="/leetcode/docs/example/collapsed/3rd-level/4th-level/">4th</a>
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<br /></li>
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</ul>
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<p><strong>Shortcodes</strong></p>
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<p>
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<a href="/leetcode/docs/shortcodes/buttons/">Buttons</a></p>
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<a href="/leetcode/docs/shortcodes/columns/">Columns</a></p>
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<a href="/leetcode/docs/shortcodes/expand/">Expand</a></p>
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<p>
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<a href="/leetcode/docs/shortcodes/hints/">Hints</a></p>
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<li>
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<p>
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<a href="/leetcode/docs/shortcodes/katex/">Katex</a></p>
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<p>
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<a href="/leetcode/docs/shortcodes/mermaid/">Mermaid</a></p>
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<p>
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<a href="/leetcode/docs/shortcodes/tabs/">Tabs</a>
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<br /></p>
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<a href="/leetcode/posts/" >
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Blog
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<script>(function(){var menu=document.querySelector("aside.book-menu nav");addEventListener("beforeunload",function(event){localStorage.setItem("menu.scrollTop",menu.scrollTop);});menu.scrollTop=localStorage.getItem("menu.scrollTop");})();</script>
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<div class="book-page">
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<header class="book-header">
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<img src="/leetcode/svg/menu.svg" class="book-icon" alt="Menu" />
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<strong>(Hu)go Template Primer</strong>
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<label for="toc-control">
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<img src="/leetcode/svg/toc.svg" class="book-icon" alt="Table of Contents" />
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</label>
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<aside class="hidden clearfix">
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<nav id="TableOfContents">
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<ul>
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<li>
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<ul>
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<li><a href="#introduction-to-go-templates">Introduction to Go Templates</a></li>
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<li><a href="#basic-syntax">Basic Syntax</a></li>
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<li><a href="#variables">Variables</a></li>
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<li><a href="#functions">Functions</a></li>
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<li><a href="#includes">Includes</a></li>
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<li><a href="#logic">Logic</a>
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<ul>
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<li><a href="#iteration">Iteration</a></li>
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<li><a href="#conditionals">Conditionals</a></li>
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</ul>
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</li>
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<li><a href="#pipes">Pipes</a></li>
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<li><a href="#context-aka-the-dot">Context (aka. the dot)</a></li>
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</ul>
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</li>
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<li><a href="#hugo-parameters">Hugo Parameters</a>
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<ul>
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<li><a href="#using-content-page-parameters">Using Content (page) Parameters</a></li>
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<li><a href="#using-site-config-parameters">Using Site (config) Parameters</a></li>
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</ul>
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</li>
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</ul>
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</nav>
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</aside>
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</header>
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<article class="markdown">
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<h1>
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<a href="/leetcode/posts/goisforlovers/">(Hu)go Template Primer</a>
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</h1>
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<h5>Apr 2, 2014</h5>
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<div>
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<a href="/leetcode/categories/Development/">Development</a>,
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<a href="/leetcode/categories/golang/">golang</a>
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</div>
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<div>
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<a href="/leetcode/tags/go/">go</a>,
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<a href="/leetcode/tags/golang/">golang</a>,
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<a href="/leetcode/tags/templates/">templates</a>,
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<a href="/leetcode/tags/themes/">themes</a>,
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<a href="/leetcode/tags/development/">development</a>
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</div>
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<p><p>Hugo uses the excellent
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<a href="https://golang.org/">Go</a>
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<a href="https://golang.org/pkg/html/template/">html/template</a> library for
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its template engine. It is an extremely lightweight engine that provides a very
|
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small amount of logic. In our experience that it is just the right amount of
|
|
logic to be able to create a good static website. If you have used other
|
|
template systems from different languages or frameworks you will find a lot of
|
|
similarities in Go templates.</p>
|
|
<p>This document is a brief primer on using Go templates. The
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<a href="https://golang.org/pkg/html/template/">Go docs</a>
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provide more details.</p>
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<h2 id="introduction-to-go-templates">
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Introduction to Go Templates
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<a class="anchor" href="#introduction-to-go-templates">#</a>
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</h2>
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<p>Go templates provide an extremely simple template language. It adheres to the
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belief that only the most basic of logic belongs in the template or view layer.
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One consequence of this simplicity is that Go templates parse very quickly.</p>
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<p>A unique characteristic of Go templates is they are content aware. Variables and
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content will be sanitized depending on the context of where they are used. More
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details can be found in the
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<a href="https://golang.org/pkg/html/template/">Go docs</a>.</p>
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<h2 id="basic-syntax">
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Basic Syntax
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<a class="anchor" href="#basic-syntax">#</a>
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</h2>
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<p>Golang templates are HTML files with the addition of variables and
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functions.</p>
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<p><strong>Go variables and functions are accessible within {{ }}</strong></p>
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<p>Accessing a predefined variable “foo”:</p>
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<pre><code>{{ foo }}
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</code></pre>
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<p><strong>Parameters are separated using spaces</strong></p>
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<p>Calling the add function with input of 1, 2:</p>
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<pre><code>{{ add 1 2 }}
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</code></pre>
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<p><strong>Methods and fields are accessed via dot notation</strong></p>
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<p>Accessing the Page Parameter “bar”</p>
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<pre><code>{{ .Params.bar }}
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</code></pre>
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<p><strong>Parentheses can be used to group items together</strong></p>
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<pre><code>{{ if or (isset .Params "alt") (isset .Params "caption") }} Caption {{ end }}
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</code></pre>
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<h2 id="variables">
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Variables
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<a class="anchor" href="#variables">#</a>
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</h2>
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<p>Each Go template has a struct (object) made available to it. In hugo each
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template is passed either a page or a node struct depending on which type of
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page you are rendering. More details are available on the
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<a href="/layout/variables">variables</a> page.</p>
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<p>A variable is accessed by referencing the variable name.</p>
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<pre><code><title>{{ .Title }}</title>
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</code></pre>
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<p>Variables can also be defined and referenced.</p>
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<pre><code>{{ $address := "123 Main St."}}
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{{ $address }}
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</code></pre>
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<h2 id="functions">
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Functions
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<a class="anchor" href="#functions">#</a>
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</h2>
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<p>Go template ship with a few functions which provide basic functionality. The Go
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template system also provides a mechanism for applications to extend the
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available functions with their own.
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<a href="/layout/functions">Hugo template
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functions</a> provide some additional functionality we believe
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are useful for building websites. Functions are called by using their name
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followed by the required parameters separated by spaces. Template
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functions cannot be added without recompiling hugo.</p>
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<p><strong>Example:</strong></p>
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<pre><code>{{ add 1 2 }}
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</code></pre>
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<h2 id="includes">
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Includes
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<a class="anchor" href="#includes">#</a>
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</h2>
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<p>When including another template you will pass to it the data it will be
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able to access. To pass along the current context please remember to
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include a trailing dot. The templates location will always be starting at
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the /layout/ directory within Hugo.</p>
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<p><strong>Example:</strong></p>
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<pre><code>{{ template "chrome/header.html" . }}
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</code></pre>
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<h2 id="logic">
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Logic
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<a class="anchor" href="#logic">#</a>
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</h2>
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<p>Go templates provide the most basic iteration and conditional logic.</p>
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<h3 id="iteration">
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Iteration
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<a class="anchor" href="#iteration">#</a>
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</h3>
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<p>Just like in Go, the Go templates make heavy use of range to iterate over
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a map, array or slice. The following are different examples of how to use
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range.</p>
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<p><strong>Example 1: Using Context</strong></p>
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<pre><code>{{ range array }}
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{{ . }}
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{{ end }}
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</code></pre>
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<p><strong>Example 2: Declaring value variable name</strong></p>
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<pre><code>{{range $element := array}}
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{{ $element }}
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{{ end }}
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</code></pre>
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<p><strong>Example 2: Declaring key and value variable name</strong></p>
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<pre><code>{{range $index, $element := array}}
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{{ $index }}
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{{ $element }}
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{{ end }}
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</code></pre>
|
|
<h3 id="conditionals">
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Conditionals
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<a class="anchor" href="#conditionals">#</a>
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</h3>
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<p>If, else, with, or, & and provide the framework for handling conditional
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logic in Go Templates. Like range, each statement is closed with <code>end</code>.</p>
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<p>Go Templates treat the following values as false:</p>
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<ul>
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<li>false</li>
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<li>0</li>
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<li>any array, slice, map, or string of length zero</li>
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</ul>
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<p><strong>Example 1: If</strong></p>
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<pre><code>{{ if isset .Params "title" }}<h4>{{ index .Params "title" }}</h4>{{ end }}
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</code></pre>
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<p><strong>Example 2: If -> Else</strong></p>
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<pre><code>{{ if isset .Params "alt" }}
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{{ index .Params "alt" }}
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{{else}}
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{{ index .Params "caption" }}
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{{ end }}
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</code></pre>
|
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<p><strong>Example 3: And & Or</strong></p>
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<pre><code>{{ if and (or (isset .Params "title") (isset .Params "caption")) (isset .Params "attr")}}
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</code></pre>
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<p><strong>Example 4: With</strong></p>
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<p>An alternative way of writing “if” and then referencing the same value
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is to use “with” instead. With rebinds the context <code>.</code> within its scope,
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and skips the block if the variable is absent.</p>
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<p>The first example above could be simplified as:</p>
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<pre><code>{{ with .Params.title }}<h4>{{ . }}</h4>{{ end }}
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</code></pre>
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<p><strong>Example 5: If -> Else If</strong></p>
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<pre><code>{{ if isset .Params "alt" }}
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{{ index .Params "alt" }}
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{{ else if isset .Params "caption" }}
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{{ index .Params "caption" }}
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{{ end }}
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</code></pre>
|
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<h2 id="pipes">
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Pipes
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<a class="anchor" href="#pipes">#</a>
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</h2>
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<p>One of the most powerful components of Go templates is the ability to
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stack actions one after another. This is done by using pipes. Borrowed
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from unix pipes, the concept is simple, each pipeline’s output becomes the
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input of the following pipe.</p>
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<p>Because of the very simple syntax of Go templates, the pipe is essential
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to being able to chain together function calls. One limitation of the
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pipes is that they only can work with a single value and that value
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becomes the last parameter of the next pipeline.</p>
|
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<p>A few simple examples should help convey how to use the pipe.</p>
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<p><strong>Example 1 :</strong></p>
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<pre><code>{{ if eq 1 1 }} Same {{ end }}
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</code></pre>
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<p>is the same as</p>
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<pre><code>{{ eq 1 1 | if }} Same {{ end }}
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</code></pre>
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<p>It does look odd to place the if at the end, but it does provide a good
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illustration of how to use the pipes.</p>
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<p><strong>Example 2 :</strong></p>
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<pre><code>{{ index .Params "disqus_url" | html }}
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</code></pre>
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<p>Access the page parameter called “disqus_url” and escape the HTML.</p>
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<p><strong>Example 3 :</strong></p>
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<pre><code>{{ if or (or (isset .Params "title") (isset .Params "caption")) (isset .Params "attr")}}
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Stuff Here
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{{ end }}
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</code></pre>
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<p>Could be rewritten as</p>
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<pre><code>{{ isset .Params "caption" | or isset .Params "title" | or isset .Params "attr" | if }}
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Stuff Here
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{{ end }}
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</code></pre>
|
|
<h2 id="context-aka-the-dot">
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|
Context (aka. the dot)
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|
<a class="anchor" href="#context-aka-the-dot">#</a>
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</h2>
|
|
<p>The most easily overlooked concept to understand about Go templates is that {{ . }}
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always refers to the current context. In the top level of your template this
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will be the data set made available to it. Inside of a iteration it will have
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the value of the current item. When inside of a loop the context has changed. .
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will no longer refer to the data available to the entire page. If you need to
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access this from within the loop you will likely want to set it to a variable
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instead of depending on the context.</p>
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<p><strong>Example:</strong></p>
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<pre><code> {{ $title := .Site.Title }}
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{{ range .Params.tags }}
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<li> <a href="{{ $baseurl }}/tags/{{ . | urlize }}">{{ . }}</a> - {{ $title }} </li>
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{{ end }}
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</code></pre>
|
|
<p>Notice how once we have entered the loop the value of {{ . }} has changed. We
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|
have defined a variable outside of the loop so we have access to it from within
|
|
the loop.</p>
|
|
<h1 id="hugo-parameters">
|
|
Hugo Parameters
|
|
<a class="anchor" href="#hugo-parameters">#</a>
|
|
</h1>
|
|
<p>Hugo provides the option of passing values to the template language
|
|
through the site configuration (for sitewide values), or through the meta
|
|
data of each specific piece of content. You can define any values of any
|
|
type (supported by your front matter/config format) and use them however
|
|
you want to inside of your templates.</p>
|
|
<h2 id="using-content-page-parameters">
|
|
Using Content (page) Parameters
|
|
<a class="anchor" href="#using-content-page-parameters">#</a>
|
|
</h2>
|
|
<p>In each piece of content you can provide variables to be used by the
|
|
templates. This happens in the
|
|
<a href="/content/front-matter">front matter</a>.</p>
|
|
<p>An example of this is used in this documentation site. Most of the pages
|
|
benefit from having the table of contents provided. Sometimes the TOC just
|
|
doesn’t make a lot of sense. We’ve defined a variable in our front matter
|
|
of some pages to turn off the TOC from being displayed.</p>
|
|
<p>Here is the example front matter:</p>
|
|
<pre><code>---
|
|
title: "Permalinks"
|
|
date: "2013-11-18"
|
|
aliases:
|
|
- "/doc/permalinks/"
|
|
groups: ["extras"]
|
|
groups_weight: 30
|
|
notoc: true
|
|
---
|
|
</code></pre><p>Here is the corresponding code inside of the template:</p>
|
|
<pre><code> {{ if not .Params.notoc }}
|
|
<div id="toc" class="well col-md-4 col-sm-6">
|
|
{{ .TableOfContents }}
|
|
</div>
|
|
{{ end }}
|
|
</code></pre>
|
|
<h2 id="using-site-config-parameters">
|
|
Using Site (config) Parameters
|
|
<a class="anchor" href="#using-site-config-parameters">#</a>
|
|
</h2>
|
|
<p>In your top-level configuration file (eg, <code>config.yaml</code>) you can define site
|
|
parameters, which are values which will be available to you in chrome.</p>
|
|
<p>For instance, you might declare:</p>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#66d9ef">params</span>:
|
|
<span style="color:#66d9ef">CopyrightHTML</span>: <span style="color:#e6db74">"Copyright &#xA9; 2013 John Doe. All Rights Reserved."</span>
|
|
<span style="color:#66d9ef">TwitterUser</span>: <span style="color:#e6db74">"spf13"</span>
|
|
<span style="color:#66d9ef">SidebarRecentLimit</span>: <span style="color:#ae81ff">5</span>
|
|
</code></pre></div><p>Within a footer layout, you might then declare a <code><footer></code> which is only
|
|
provided if the <code>CopyrightHTML</code> parameter is provided, and if it is given,
|
|
you would declare it to be HTML-safe, so that the HTML entity is not escaped
|
|
again. This would let you easily update just your top-level config file each
|
|
January 1st, instead of hunting through your templates.</p>
|
|
<pre><code>{{if .Site.Params.CopyrightHTML}}<footer>
|
|
<div class="text-center">{{.Site.Params.CopyrightHTML | safeHtml}}</div>
|
|
</footer>{{end}}
|
|
</code></pre><p>An alternative way of writing the “if” and then referencing the same value
|
|
is to use “with” instead. With rebinds the context <code>.</code> within its scope,
|
|
and skips the block if the variable is absent:</p>
|
|
<pre><code>{{with .Site.Params.TwitterUser}}<span class="twitter">
|
|
<a href="https://twitter.com/{{.}}" rel="author">
|
|
<img src="/images/twitter.png" width="48" height="48" title="Twitter: {{.}}"
|
|
alt="Twitter"></a>
|
|
</span>{{end}}
|
|
</code></pre><p>Finally, if you want to pull “magic constants” out of your layouts, you can do
|
|
so, such as in this example:</p>
|
|
<pre><code><nav class="recent">
|
|
<h1>Recent Posts</h1>
|
|
<ul>{{range first .Site.Params.SidebarRecentLimit .Site.Recent}}
|
|
<li><a href="{{.RelPermalink}}">{{.Title}}</a></li>
|
|
{{end}}</ul>
|
|
</nav>
|
|
</code></pre></p>
|
|
</article>
|
|
|
|
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|
|
|
<footer class="book-footer">
|
|
|
|
<div class="flex flex-wrap justify-between">
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
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|
</footer>
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|
|
<label for="menu-control" class="hidden book-menu-overlay"></label>
|
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</div>
|
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|
|
<aside class="book-toc">
|
|
|
|
<nav id="TableOfContents">
|
|
<ul>
|
|
<li>
|
|
<ul>
|
|
<li><a href="#introduction-to-go-templates">Introduction to Go Templates</a></li>
|
|
<li><a href="#basic-syntax">Basic Syntax</a></li>
|
|
<li><a href="#variables">Variables</a></li>
|
|
<li><a href="#functions">Functions</a></li>
|
|
<li><a href="#includes">Includes</a></li>
|
|
<li><a href="#logic">Logic</a>
|
|
<ul>
|
|
<li><a href="#iteration">Iteration</a></li>
|
|
<li><a href="#conditionals">Conditionals</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a href="#pipes">Pipes</a></li>
|
|
<li><a href="#context-aka-the-dot">Context (aka. the dot)</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a href="#hugo-parameters">Hugo Parameters</a>
|
|
<ul>
|
|
<li><a href="#using-content-page-parameters">Using Content (page) Parameters</a></li>
|
|
<li><a href="#using-site-config-parameters">Using Site (config) Parameters</a></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</nav>
|
|
|
|
|
|
</aside>
|
|
|
|
</main>
|
|
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|
|
</body>
|
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|
|
</html>
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