From 9c55840ca87fb369f3a6d828d83075698899339e Mon Sep 17 00:00:00 2001
From: expikr <77922942+expikr@users.noreply.github.com>
Date: Thu, 23 Nov 2023 20:17:18 +0800
Subject: [PATCH] Add asciimath support

Update mathjax.md
---
 guide/src/format/configuration/renderers.md  |  3 +++
 guide/src/format/mathjax.md                  | 13 +++++++++++++
 src/config.rs                                |  3 +++
 src/renderer/html_handlebars/hbs_renderer.rs |  4 ++++
 src/theme/index.hbs                          |  4 ++++
 test_book/book.toml                          |  1 +
 6 files changed, 28 insertions(+)

diff --git a/guide/src/format/configuration/renderers.md b/guide/src/format/configuration/renderers.md
index 16a4251633..f6970e1708 100644
--- a/guide/src/format/configuration/renderers.md
+++ b/guide/src/format/configuration/renderers.md
@@ -99,6 +99,7 @@ default-theme = "light"
 preferred-dark-theme = "navy"
 curly-quotes = true
 mathjax-support = false
+asciimath-support = false
 copy-fonts = true
 additional-css = ["custom.css", "custom2.css"]
 additional-js = ["custom.js"]
@@ -126,6 +127,8 @@ The following configuration options are available:
   that occur in code blocks and code spans. Defaults to `false`.
 - **mathjax-support:** Adds support for [MathJax](../mathjax.md). Defaults to
   `false`.
+- **asciimath-support:** Enables AsciiMath for [MathJax](../mathjax.md) if enabled, otherwise has no effect. Defaults to
+  `false`.
 - **copy-fonts:** (**Deprecated**) If `true` (the default), mdBook uses its built-in fonts which are copied to the output directory.
   If `false`, the built-in fonts will not be used.
   This option is deprecated. If you want to define your own custom fonts,
diff --git a/guide/src/format/mathjax.md b/guide/src/format/mathjax.md
index 3dd792159d..e1d6768f46 100644
--- a/guide/src/format/mathjax.md
+++ b/guide/src/format/mathjax.md
@@ -41,3 +41,16 @@ you would write:
 ```bash
 \\[ \mu = \frac{1}{N} \sum_{i=0} x_i \\]
 ```
+
+### AsciiMath syntax
+
+[AsciiMath](http://asciimath.org/) is a less verbose equation syntax than LaTeX, delimited by <kbd>\\\`...\\\`</kbd>.
+
+To enable AsciiMath, you need to add the `asciimath-support` key to your `book.toml`
+under the `output.html` section, in addition to enabling `mathjax-support`:
+
+```toml
+[output.html]
+mathjax-support = true
+asciimath-support = true
+```
\ No newline at end of file
diff --git a/src/config.rs b/src/config.rs
index 1a30c50787..a43e06bbbc 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -490,6 +490,8 @@ pub struct HtmlConfig {
     pub curly_quotes: bool,
     /// Should mathjax be enabled?
     pub mathjax_support: bool,
+    /// Should asciimath be enabled?
+    pub asciimath_support: bool,
     /// Whether to fonts.css and respective font files to the output directory.
     pub copy_fonts: bool,
     /// An optional google analytics code.
@@ -550,6 +552,7 @@ impl Default for HtmlConfig {
             preferred_dark_theme: None,
             curly_quotes: false,
             mathjax_support: false,
+            asciimath_support: false,
             copy_fonts: true,
             google_analytics: None,
             additional_css: Vec::new(),
diff --git a/src/renderer/html_handlebars/hbs_renderer.rs b/src/renderer/html_handlebars/hbs_renderer.rs
index e170e2fcda..7ac4f9f64a 100644
--- a/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/src/renderer/html_handlebars/hbs_renderer.rs
@@ -681,6 +681,10 @@ fn make_data(
         data.insert("mathjax_support".to_owned(), json!(true));
     }
 
+    if html_config.asciimath_support {
+        data.insert("asciimath_support".to_owned(), json!(true));
+    }
+
     // This `matches!` checks for a non-empty file.
     if html_config.copy_fonts || matches!(theme.fonts_css.as_deref(), Some([_, ..])) {
         data.insert("copy_fonts".to_owned(), json!(true));
diff --git a/src/theme/index.hbs b/src/theme/index.hbs
index 6f3948c652..d2fab36bfc 100644
--- a/src/theme/index.hbs
+++ b/src/theme/index.hbs
@@ -50,8 +50,12 @@
 
         {{#if mathjax_support}}
         <!-- MathJax -->
+        {{#if asciimath_support}}
+        <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_HTMLorMML"></script>
+        {{else}}
         <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
         {{/if}}
+        {{/if}}
     </head>
     <body>
     <div id="body-container">
diff --git a/test_book/book.toml b/test_book/book.toml
index a30500763c..5f4485cfc3 100644
--- a/test_book/book.toml
+++ b/test_book/book.toml
@@ -9,6 +9,7 @@ edition = "2018"
 
 [output.html]
 mathjax-support = true
+asciimath-support = true
 
 [output.html.playground]
 editable = true