Merge pull request #124 from tommilligan/bug-123

feat: support admonitions inside list items

5 files changed, 153 insertions, 17 deletions

diff --git a/integration/expected/chapter_1_main.html b/integration/expected/chapter_1_main.html
index 1425700..dcd49cb 100644
--- a/integration/expected/chapter_1_main.html
+++ b/integration/expected/chapter_1_main.html
@@ -90,4 +90,29 @@ let x = 20;
 <span class="boring">}</span></code></pre></pre>
 </div>
 </div>
+<p>In a list:</p>
+<ol>
+<li>
+<p>Thing one</p>
+<pre><code class="language-sh">Thing one
+</code></pre>
+</li>
+<li>
+<p>Thing two</p>
+<div id="admonition-note-4" class="admonition note">
+<div class="admonition-title">
+<p>Note</p>
+<p><a class="admonition-anchor-link" href="#admonition-note-4"></a></p>
+</div>
+<div>
+<p>Thing two</p>
+</div>
+</div>
+</li>
+<li>
+<p>Thing three</p>
+<pre><code class="language-sh">Thing three
+</code></pre>
+</li>
+</ol>
 
diff --git a/integration/src/chapter_1.md b/integration/src/chapter_1.md
index aa0b3ce..93b7ccd 100644
--- a/integration/src/chapter_1.md
+++ b/integration/src/chapter_1.md
@@ -41,3 +41,23 @@ let x = 10;
 let x = 20;
 ```
 ````
+
+In a list:
+
+1. Thing one
+
+   ```sh
+   Thing one
+   ```
+
+1. Thing two
+
+   ```admonish
+   Thing two
+   ```
+
+1. Thing three
+
+   ```sh
+   Thing three
+   ```
diff --git a/src/markdown.rs b/src/markdown.rs
index a685d8e..0ea2fa2 100644
--- a/src/markdown.rs
+++ b/src/markdown.rs
@@ -29,11 +29,24 @@ pub(crate) fn preprocess(
         if let Event::Start(Tag::CodeBlock(Fenced(info_string))) = event.clone() {
             let span_content = &content[span.start..span.end];
 
+            // Scan for a line start before this span.
+            // For safety, only scan up to a fixed limit of the text
+            const INDENT_SCAN_MAX: usize = 1024;
+            // If there's less text than that, just scan from the start
+            let line_scan_start = span.start.checked_sub(INDENT_SCAN_MAX).unwrap_or_default();
+            // If we can't find a newline, assume no indent
+            let indent = content[line_scan_start..span.start]
+                .chars()
+                .rev()
+                .position(|c| c == '\n')
+                .unwrap_or_default();
+
             let admonition = match parse_admonition(
                 info_string.as_ref(),
                 admonition_defaults,
                 span_content,
                 on_failure,
+                indent,
             ) {
                 Some(admonition) => admonition,
                 None => continue,
@@ -732,4 +745,62 @@ Text
 
         assert_eq!(expected, prep(content));
     }
+
+    #[test]
+    fn list_embed() {
+        let content = r#"# Chapter
+
+1. Thing one
+
+   ```sh
+   Thing one
+   ```
+
+1. Thing two
+
+   ```admonish
+   Thing two
+   ```
+
+1. Thing three
+
+   ```sh
+   Thing three
+   ```
+"#;
+
+        let expected = r##"# Chapter
+
+1. Thing one
+
+   ```sh
+   Thing one
+   ```
+
+1. Thing two
+
+   
+   <div id="admonition-note" class="admonition note">
+   <div class="admonition-title">
+   
+   Note
+   
+   <a class="admonition-anchor-link" href="#admonition-note"></a>
+   </div>
+   <div>
+   
+      Thing two
+   
+   </div>
+   </div>
+
+1. Thing three
+
+   ```sh
+   Thing three
+   ```
+"##;
+
+        assert_eq!(expected, prep(content));
+    }
 }
diff --git a/src/parse.rs b/src/parse.rs
index 89953cb..e06b234 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -23,6 +23,7 @@ pub(crate) fn parse_admonition<'a>(
     admonition_defaults: &'a AdmonitionDefaults,
     content: &'a str,
     on_failure: OnFailure,
+    indent: usize,
 ) -> Option<Result<Admonition<'a>>> {
     // We need to know fence details anyway for error messages
     let extracted = extract_admonish_body(content);
@@ -30,8 +31,6 @@ pub(crate) fn parse_admonition<'a>(
     let info = AdmonitionMeta::from_info_string(info_string, admonition_defaults)?;
     let info = match info {
         Ok(info) => info,
-        // FIXME return error messages to break build if configured
-        // Err(message) => return Some(Err(content)),
         Err(message) => {
             // Construct a fence capable of enclosing whatever we wrote for the
             // actual input block
@@ -63,6 +62,7 @@ Original markdown input:
 {enclosing_fence}
 "#
                         )),
+                        indent,
                     })
                 }
                 OnFailure::Bail => Err(anyhow!("Error processing admonition, bailing:\n{content}")),
@@ -70,7 +70,24 @@ Original markdown input:
         }
     };
 
-    Some(Ok(Admonition::new(info, extracted.body)))
+    Some(Ok(Admonition::new(
+        info,
+        extracted.body,
+        // Note that this is a bit hacky - the fence information comes from the start
+        // of the block, and includes the whole line.
+        //
+        // This is more likely to be what we want, as ending indentation is unrelated
+        // according to the commonmark spec (ref https://spec.commonmark.org/0.12/#example-85)
+        //
+        // The main case we're worried about here is indenting enough to be inside list items,
+        // and in this case the starting code fence must be indented enough to be considered
+        // part of the list item.
+        //
+        // The hacky thing is that we're considering line indent in the document as a whole,
+        // not relative to the context of some containing item. But I think that's what we
+        // want for now, anyway.
+        indent,
+    )))
 }
 
 /// We can't trust the info string length to find the start of the body
diff --git a/src/render.rs b/src/render.rs
index b1094b6..d6e9eff 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -31,10 +31,11 @@ pub(crate) struct Admonition<'a> {
     pub(crate) content: Cow<'a, str>,
     pub(crate) additional_classnames: Vec<String>,
     pub(crate) collapsible: bool,
+    pub(crate) indent: usize,
 }
 
 impl<'a> Admonition<'a> {
-    pub(crate) fn new(info: AdmonitionMeta, content: &'a str) -> Self {
+    pub(crate) fn new(info: AdmonitionMeta, content: &'a str, indent: usize) -> Self {
         let AdmonitionMeta {
             directive,
             title,
@@ -47,6 +48,7 @@ impl<'a> Admonition<'a> {
             content: Cow::Borrowed(content),
             additional_classnames,
             collapsible,
+            indent,
         }
     }
 
@@ -66,17 +68,18 @@ impl<'a> Admonition<'a> {
         let mut additional_class = Cow::Borrowed(self.directive.classname());
         let title = &self.title;
         let content = &self.content;
+        let indent = " ".repeat(self.indent);
 
         let title_block = if self.collapsible { "summary" } else { "div" };
 
         let title_html = if !title.is_empty() {
             Cow::Owned(format!(
-                r##"<{title_block} class="admonition-title">
-
-{title}
-
-<a class="admonition-anchor-link" href="#{ANCHOR_ID_PREFIX}-{anchor_id}"></a>
-</{title_block}>
+                r##"{indent}<{title_block} class="admonition-title">
+{indent}
+{indent}{title}
+{indent}
+{indent}<a class="admonition-anchor-link" href="#{ANCHOR_ID_PREFIX}-{anchor_id}"></a>
+{indent}</{title_block}>
 "##
             ))
         } else {
@@ -100,13 +103,13 @@ impl<'a> Admonition<'a> {
         //   rendered as markdown paragraphs.
         format!(
             r#"
-<{admonition_block} id="{ANCHOR_ID_PREFIX}-{anchor_id}" class="admonition {additional_class}">
-{title_html}<div>
-
-{content}
-
-</div>
-</{admonition_block}>"#,
+{indent}<{admonition_block} id="{ANCHOR_ID_PREFIX}-{anchor_id}" class="admonition {additional_class}">
+{title_html}{indent}<div>
+{indent}
+{indent}{content}
+{indent}
+{indent}</div>
+{indent}</{admonition_block}>"#,
         )
     }