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<h1 id="code-highlighting"><a class="header" href="#code-highlighting">Code highlighting</a></h1>
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<p>Code highlighting is supported for the following languages:</p>
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<div class="table-wrapper"><table><thead><tr><th>Language</th><th>Execution support</th></tr></thead><tbody>
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<tr><td>ada</td><td></td></tr>
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<tr><td>asp</td><td></td></tr>
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<tr><td>awk</td><td></td></tr>
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<tr><td>bash</td><td>✓</td></tr>
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<tr><td>batchfile</td><td></td></tr>
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<tr><td>C</td><td>✓</td></tr>
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<tr><td>cmake</td><td></td></tr>
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<tr><td>crontab</td><td></td></tr>
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<tr><td>C#</td><td>✓</td></tr>
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<tr><td>clojure</td><td></td></tr>
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<tr><td>C++</td><td>✓</td></tr>
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<tr><td>CSS</td><td></td></tr>
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<tr><td>D</td><td></td></tr>
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<tr><td>diff</td><td></td></tr>
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<tr><td>docker</td><td></td></tr>
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<tr><td>dotenv</td><td></td></tr>
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<tr><td>elixir</td><td></td></tr>
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<tr><td>elm</td><td></td></tr>
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<tr><td>erlang</td><td></td></tr>
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<tr><td>fish</td><td>✓</td></tr>
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<tr><td>go</td><td>✓</td></tr>
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<tr><td>haskell</td><td>✓</td></tr>
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<tr><td>HTML</td><td></td></tr>
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<tr><td>java</td><td>✓</td></tr>
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<tr><td>javascript</td><td>✓</td></tr>
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<tr><td>json</td><td></td></tr>
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<tr><td>julia</td><td>✓</td></tr>
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<tr><td>kotlin</td><td>✓</td></tr>
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<tr><td>latex</td><td></td></tr>
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<tr><td>lua</td><td>✓</td></tr>
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<tr><td>makefile</td><td></td></tr>
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<tr><td>markdown</td><td></td></tr>
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<tr><td>nix</td><td></td></tr>
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<tr><td>ocaml</td><td></td></tr>
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<tr><td>perl</td><td>✓</td></tr>
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<tr><td>php</td><td>✓</td></tr>
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<tr><td>protobuf</td><td></td></tr>
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<tr><td>puppet</td><td></td></tr>
|
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<tr><td>python</td><td>✓</td></tr>
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<tr><td>R</td><td>✓</td></tr>
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<tr><td>ruby</td><td>✓</td></tr>
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<tr><td>rust</td><td>✓</td></tr>
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<tr><td>scala</td><td></td></tr>
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<tr><td>shell</td><td>✓</td></tr>
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<tr><td>sql</td><td></td></tr>
|
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<tr><td>swift</td><td></td></tr>
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<tr><td>svelte</td><td></td></tr>
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<tr><td>tcl</td><td></td></tr>
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<tr><td>toml</td><td></td></tr>
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<tr><td>terraform</td><td></td></tr>
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<tr><td>typescript</td><td></td></tr>
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<tr><td>xml</td><td></td></tr>
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<tr><td>yaml</td><td></td></tr>
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<tr><td>vue</td><td></td></tr>
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<tr><td>zig</td><td></td></tr>
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<tr><td>zsh</td><td>✓</td></tr>
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</tbody></table>
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</div>
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<p>Other languages that are supported are:</p>
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<ul>
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<li>nushell, for which highlighting isn't supported but execution is.</li>
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<li>rust-script, which is highlighted as rust but is executed via the <a href="https://rust-script.org/">rust-script</a> tool,
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which lets you specify dependencies in your snippet.</li>
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</ul>
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<p>If there's a language that is not in this list and you would like it to be supported, please <a href="https://github.com/mfontanini/presenterm/issues/new">create an
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issue</a>. If you'd also like code execution support, provide details
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on how to compile (if necessary) and run snippets for that language. You can also configure how to run code snippet for
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a language locally in your <a href="../../configuration/settings.html#custom-snippet-executors">config file</a>.</p>
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<h2 id="enabling-line-numbers"><a class="header" href="#enabling-line-numbers">Enabling line numbers</a></h2>
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<p>If you would like line numbers to be shown on the left of a code block use the <code>+line_numbers</code> switch after specifying
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the language in a code block:</p>
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<pre><code class="language-markdown">```rust +line_numbers
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fn hello_world() {
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println!("Hello world");
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}
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```
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</code></pre>
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<h2 id="selective-highlighting"><a class="header" href="#selective-highlighting">Selective highlighting</a></h2>
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<p>By default, the entire code block will be syntax-highlighted. If instead you only wanted a subset of it to be
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highlighted, you can use braces and a list of either individual lines, or line ranges that you'd want to highlight.</p>
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<pre><code class="language-markdown">```rust {1,3,5-7}
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fn potato() -> u32 { // 1: highlighted
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// 2: not highlighted
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println!("Hello world"); // 3: highlighted
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let mut q = 42; // 4: not highlighted
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q = q * 1337; // 5: highlighted
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q // 6: highlighted
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} // 7: highlighted
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```
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</code></pre>
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<h2 id="dynamic-highlighting"><a class="header" href="#dynamic-highlighting">Dynamic highlighting</a></h2>
|
|
<p>Similar to the syntax used for selective highlighting, dynamic highlighting will change which lines of the code in a
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|
code block are highlighted every time you move to the next/previous slide.</p>
|
|
<p>This is achieved by using the separator <code>|</code> to indicate what sections of the code will be highlighted at a given time.
|
|
You can also use <code>all</code> to highlight all lines for a particular frame.</p>
|
|
<pre><code class="language-markdown">```rust {1,3|5-7}
|
|
fn potato() -> u32 {
|
|
|
|
println!("Hello world");
|
|
let mut q = 42;
|
|
q = q * 1337;
|
|
q
|
|
}
|
|
```
|
|
</code></pre>
|
|
<p>In this example, lines 1 and 3 will be highlighted initially. Then once you press a key to move to the next slide, lines
|
|
1 and 3 will no longer be highlighted and instead lines 5 through 7 will. This allows you to create more dynamic
|
|
presentations where you can display sections of the code to explain something specific about each of them.</p>
|
|
<p>See this real example of how this looks like.</p>
|
|
<p><a href="https://asciinema.org/a/iCf4f6how1Ux3H8GNzksFUczI"><img src="https://asciinema.org/a/iCf4f6how1Ux3H8GNzksFUczI.svg" alt="asciicast" /></a></p>
|
|
<h2 id="including-external-code-snippets"><a class="header" href="#including-external-code-snippets">Including external code snippets</a></h2>
|
|
<p>The <code>file</code> snippet type can be used to specify an external code snippet that will be included and highlighted as usual.</p>
|
|
<pre><code class="language-markdown">```file +exec +line_numbers
|
|
path: snippet.rs
|
|
language: rust
|
|
```
|
|
</code></pre>
|
|
<p>If you'd like to include only a subset of the file, you can use the optional fields <code>start_line</code> and <code>end_line</code>:</p>
|
|
<pre><code class="language-markdown">```file +exec +line_numbers
|
|
path: snippet.rs
|
|
language: rust
|
|
# Only shot lines 5-10
|
|
start_line: 5
|
|
end_line: 10
|
|
```
|
|
</code></pre>
|
|
<h2 id="showing-a-snippet-without-a-background"><a class="header" href="#showing-a-snippet-without-a-background">Showing a snippet without a background</a></h2>
|
|
<p>Using the <code>+no_background</code> flag will cause the snippet to have no background. This is useful when combining it with the
|
|
<code>+exec_replace</code> flag described further down.</p>
|
|
<h2 id="adding-highlighting-syntaxes-for-new-languages"><a class="header" href="#adding-highlighting-syntaxes-for-new-languages">Adding highlighting syntaxes for new languages</a></h2>
|
|
<p><em>presenterm</em> uses the syntaxes supported by <a href="https://github.com/sharkdp/bat">bat</a> to highlight code snippets, so any
|
|
languages supported by <em>bat</em> natively can be added to <em>presenterm</em> easily. Please create a ticket or use
|
|
<a href="https://github.com/mfontanini/presenterm/pull/385">this</a> as a reference to submit a pull request to make a syntax
|
|
officially supported by <em>presenterm</em> as well.</p>
|
|
<p>If a language isn't natively supported by <em>bat</em> but you'd like to use it, you can follow
|
|
<a href="https://github.com/sharkdp/bat#adding-new-syntaxes--language-definitions">this guide in the bat docs</a> and
|
|
invoke <em>bat</em> directly in a presentation:</p>
|
|
<pre><code class="language-markdown">```bash +exec_replace
|
|
bat --color always script.py
|
|
```
|
|
</code></pre>
|
|
<div class="mdbook-alerts mdbook-alerts-note">
|
|
<p class="mdbook-alerts-title">
|
|
<span class="mdbook-alerts-icon"></span>
|
|
note
|
|
</p>
|
|
<p>Check the <a href="execution.html#executing-and-replacing">code execution docs</a> for more details on how to allow the tool to run
|
|
<code>exec_replace</code> blocks.</p>
|
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</div>
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