Hiragana & katakana helpers (#1908)

* Add hiragana and katakana template helpers

* Update documentation

* Fix documentation

2 files changed, 75 insertions, 3 deletions

diff --git a/docs/templates.md b/docs/templates.md
index f1777fde..be17c30a 100644
--- a/docs/templates.md
+++ b/docs/templates.md
@@ -539,8 +539,8 @@ Returns the type of a value.
 <details>
   <summary>Syntax:</summary>
 
-  <code>{{#typeof <i>value</i>}}{{/get}}</code><br>
-  <code>{{#typeof}}<i>value</i>{{/get}}</code><br>
+  <code>{{#typeof <i>value</i>}}{{/typeof}}</code><br>
+  <code>{{#typeof}}<i>value</i>{{/typeof}}</code><br>
 
   * _`value`_ <br>
     The value to check.
@@ -775,6 +775,64 @@ same as the system used for generating popup and search page dictionary entries.
 </details>
 
 
+### `hiragana`
+
+Converts katakana text to hiragana.
+
+<details>
+  <summary>Syntax:</summary>
+
+  <code>{{#hiragana <i>value</i>}}{{/hiragana}}</code><br>
+  <code>{{#hiragana}}<i>value</i>{{/hiragana}}</code><br>
+
+  * _`value`_ <br>
+    The text to convert.
+</details>
+<details>
+  <summary>Example:</summary>
+
+  ```handlebars
+  {{#hiragana "よみちゃん ヨミちゃん ヨミチャン"}}{{/hiragana}}
+  {{#hiragana}}よみちゃん ヨミちゃん ヨミチャン{{/hiragana}}
+  ```
+
+  Output:
+  ```html
+  よみちゃん よみちゃん よみちゃん
+  よみちゃん よみちゃん よみちゃん
+  ```
+</details>
+
+
+### `katakana`
+
+Converts hiragana text to katakana.
+
+<details>
+  <summary>Syntax:</summary>
+
+  <code>{{#katakana <i>text</i>}}{{/katakana}}</code><br>
+  <code>{{#katakana}}<i>text</i>{{/katakana}}</code><br>
+
+  * _`text`_ <br>
+    The text to convert.
+</details>
+<details>
+  <summary>Example:</summary>
+
+  ```handlebars
+  {{#hiragana "よみちゃん ヨミちゃん ヨミチャン"}}{{/hiragana}}
+  {{#hiragana}}よみちゃん ヨミちゃん ヨミチャン{{/hiragana}}
+  ```
+
+  Output:
+  ```html
+  ヨミチャン ヨミチャン ヨミチャン
+  ヨミチャン ヨミチャン ヨミチャン
+  ```
+</details>
+
+
 ## Legacy Helpers
 
 Yomichan has historically used Handlebars templates to generate the HTML used on the search page and results popup.
diff --git a/ext/js/templates/sandbox/anki-template-renderer.js b/ext/js/templates/sandbox/anki-template-renderer.js
index 43092ec2..8a257bcc 100644
--- a/ext/js/templates/sandbox/anki-template-renderer.js
+++ b/ext/js/templates/sandbox/anki-template-renderer.js
@@ -87,7 +87,9 @@ class AnkiTemplateRenderer {
             ['formatGlossary',   this._formatGlossary.bind(this)],
             ['hasMedia',         this._hasMedia.bind(this)],
             ['getMedia',         this._getMedia.bind(this)],
-            ['pronunciation',    this._pronunciation.bind(this)]
+            ['pronunciation',    this._pronunciation.bind(this)],
+            ['hiragana',         this._hiragana.bind(this)],
+            ['katakana',         this._katakana.bind(this)]
         ]);
         this._templateRenderer.registerDataType('ankiNote', {
             modifier: ({marker, commonData}) => this._ankiNoteDataCreator.create(marker, commonData),
@@ -591,4 +593,16 @@ class AnkiTemplateRenderer {
                 return '';
         }
     }
+
+    _hiragana(context, ...args) {
+        const ii = args.length - 1;
+        const value = (ii > 0 ? args[0] : args[ii].fn(context));
+        return this._japaneseUtil.convertKatakanaToHiragana(value);
+    }
+
+    _katakana(context, ...args) {
+        const ii = args.length - 1;
+        const value = (ii > 0 ? args[0] : args[ii].fn(context));
+        return this._japaneseUtil.convertHiraganaToKatakana(value);
+    }
 }