From 384bac2d79ad137a29ff45913d63dd29d1104747 Mon Sep 17 00:00:00 2001
From: Ben Bridle <ben@derelict.engineering>
Date: Tue, 14 Jan 2025 19:09:59 +1300
Subject: Parse checkbox lists

If a list item line begins with `[ ]` or `[x]`, the token is interpreted
as a checkbox and replaced with a real HTML checkbox.
---
 src/generate_html.rs | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/generate_html.rs b/src/generate_html.rs
index d48e3fe..129e2dd 100644
--- a/src/generate_html.rs
+++ b/src/generate_html.rs
@@ -124,21 +124,32 @@ pub fn document_to_html(document: &MarkdownDocument, page: &Page, website: &Webs
                 let mut depth = 0;
                 let mut prev = '\0';
                 let mut output = String::new();
+                let mut class = String::new();
                 for c in line_to_html!(line).chars() {
                     output.push(c);
                     if c == '<' {
                         depth += 1;
                     } else if c == '/' && prev == '<' {
-                        depth -= 2;
+                        depth -= 2;  // 2 because prev was a '<' as well.
                     } else if c == ':' && depth == 0 {
-                        output.pop(); output.push_str("<br>"); depth += 99;
+                        output.pop(); output.push_str("<br>");
+                        class.push_str("extended"); depth += 99;
                     }
                     prev = c;
                 }
-                match output.contains("<br>") {
-                    true => html!("<li class='extended'>{output}</li>"),
-                    false => html!("<li>{output}</li>"),
+                // Replace a leading checkbox with a real checkbox.
+                if let Some(stripped) = output.strip_prefix("<code>[ ]</code>") {
+                    output = format!("<input type='checkbox' disabled>{stripped}");
+                    class.push_str(" checkbox");
+                } else if let Some(stripped) = output.strip_prefix("<code>[x]</code>") {
+                    output = format!("<input type='checkbox' disabled checked>{stripped}");
+                    class.push_str(" checkbox");
+                } else if let Some(stripped) = output.strip_prefix("<code>[X]</code>") {
+                    output = format!("<input type='checkbox' disabled checked>{stripped}");
+                    class.push_str(" checkbox");
                 }
+                let class = class.trim();
+                html!("<li class='{class}'>{output}</li>")
             }),
             Block::Note(lines) => wrap!("aside", for line in lines { tag!("p", line) }),
             Block::Embedded { label, path } => match path.rsplit_once('.') {
-- 
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