feat: remove title bar if title empty

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Added
 
 - Additional classnames can be specified using `directive.classname` syntax
+- Support removing the title bar entirely
 
 ### Fixed
 

README.md

@@ -3,8 +3,7 @@
 [![Latest version](https://img.shields.io/crates/v/mdbook-admonish.svg)](https://crates.io/crates/mdbook-admonish)
 [![docs.rs](https://img.shields.io/docsrs/mdbook-admonish)](https://docs.rs/mdbook-admonish)
 
-A preprocessor for [mdbook](https://github.com/rust-lang-nursery/mdBook) to add [Material Design](https://material.io/design) admonishments,
-based on the [mkdocs-material](https://squidfunk.github.io/mkdocs-material/reference/admonitions/) implementation.
+A preprocessor for [mdbook](https://github.com/rust-lang-nursery/mdBook) to add [Material Design](https://material.io/design) admonishments, based on the [mkdocs-material](https://squidfunk.github.io/mkdocs-material/reference/admonitions/) implementation.
 
 It turns this:
 
@@ -64,6 +63,16 @@ The following steps can lead to irrecoverable data corruption.
 
 ![Data Loss](img/data-loss.png)
 
+You can also remove the title bar entirely, by specifying the empty string:
+
+````
+```admonish success ""
+This will take a while, go and grab a drink of water.
+```
+````
+
+![No Title Bar](img/no-title-bar.png)
+
 #### Nested Markdown/HTML
 
 Markdown and HTML can be used in the inner content, as you'd expect:
@@ -77,8 +86,7 @@ accomplished with the <span style="color: hotpink">dereference operator</span>,
 
 ![Complex Message](img/complex-message.png)
 
-If you have code blocks you want to include in the content,
-use [tildes for the outer code fence](https://spec.commonmark.org/0.30/#fenced-code-blocks):
+If you have code blocks you want to include in the content, use [tildes for the outer code fence](https://spec.commonmark.org/0.30/#fenced-code-blocks):
 
 ````
 ~~~admonish bug
@@ -146,9 +154,7 @@ mdbook path/to/book
 
 ### Updates
 
-**Please note**, when updating your version of `mdbook-admonish`, updated styles
-will not be applied unless you rerun `mdbook-admonish install` to update the additional
-CSS files in your book.
+**Please note**, when updating your version of `mdbook-admonish`, updated styles will not be applied unless you rerun `mdbook-admonish install` to update the additional CSS files in your book.
 
 ## Development
 

integration/expected/chapter_1_main.html

@@ -16,4 +16,9 @@
 <p>Simples</p>
 </div>
 </div>
+<div class="admonition warning">
+<div>
+<p>No title, only body</p>
+</div>
+</div>
 

integration/src/chapter_1.md

@@ -9,3 +9,7 @@ It verifies that `mdbook` post-processes our generated HTML in the way we expect
 ```admonish
 Simples
 ```
+
+```admonish warning ""
+No title, only body
+```

src/lib.rs

@@ -101,45 +101,37 @@ struct AdmonitionInfoRaw<'a> {
 #[derive(Debug, PartialEq)]
 struct AdmonitionInfo<'a> {
     directive: Directive,
-    title: Cow<'a, str>,
+    title: Option<String>,
     additional_classnames: Option<Vec<&'a str>>,
 }
 
-impl<'a> Default for AdmonitionInfo<'a> {
-    fn default() -> Self {
-        Self {
-            directive: Directive::Note,
-            title: Cow::Borrowed("Note"),
-            additional_classnames: None,
-        }
-    }
-}
-
-impl<'a> TryFrom<AdmonitionInfoRaw<'a>> for AdmonitionInfo<'a> {
-    type Error = ();
-
-    fn try_from(other: AdmonitionInfoRaw<'a>) -> Result<Self, ()> {
+impl<'a> From<AdmonitionInfoRaw<'a>> for AdmonitionInfo<'a> {
+    fn from(other: AdmonitionInfoRaw<'a>) -> Self {
         let AdmonitionInfoRaw {
-            directive,
+            directive: raw_directive,
             title,
             additional_classnames,
         } = other;
-        let title = title
-            .map(Cow::Owned)
-            .unwrap_or_else(|| Cow::Owned(ucfirst(directive)));
-        let directive = Directive::from_str(directive)?;
-        Ok(Self {
+        let (directive, title) = match (Directive::from_str(raw_directive), title) {
+            (Ok(directive), None) => (directive, ucfirst(raw_directive)),
+            (Err(_), None) => (Directive::Note, "Note".to_owned()),
+            (Ok(directive), Some(title)) => (directive, title),
+            (Err(_), Some(title)) => (Directive::Note, title),
+        };
+        // If the user explicitly gave no title, then disable the title bar
+        let title = if title.is_empty() { None } else { Some(title) };
+        Self {
             directive,
             title,
             additional_classnames,
-        })
+        }
     }
 }
 
 #[derive(Debug, PartialEq)]
 struct Admonition<'a> {
     directive: Directive,
-    title: Cow<'a, str>,
+    title: Option<String>,
     content: &'a str,
     additional_classnames: Option<Vec<&'a str>>,
 }
@@ -164,6 +156,20 @@ impl<'a> Admonition<'a> {
         let title = &self.title;
         let content = &self.content;
 
+        let title_html = title
+            .as_ref()
+            .map(|title| {
+                Cow::Owned(format!(
+                    r#"<div class="admonition-title">
+
+{title}
+
+</div>
+"#
+                ))
+            })
+            .unwrap_or(Cow::Borrowed(""));
+
         if let Some(additional_classnames) = &self.additional_classnames {
             let mut buffer = additional_class.into_owned();
             for additional_classname in additional_classnames {
@@ -180,12 +186,7 @@ impl<'a> Admonition<'a> {
         //   rendered as markdown paragraphs.
         format!(
             r#"<div class="admonition {additional_class}">
-<div class="admonition-title">
-
-{title}
-
-</div>
-<div>
+{title_html}<div>
 
 {content}
 
@@ -201,7 +202,7 @@ const ADMONISH_BLOCK_KEYWORD: &str = "admonish";
 /// - `None` if this is not an `admonish` block.
 /// - `Some(AdmonitionInfoRaw)` if this is an `admonish` block
 fn parse_info_string(info_string: &str) -> Option<AdmonitionInfoRaw> {
-    // Get the rest of the info string if this is an admonitionment
+    // Get the rest of the info string if this is an admonition
     let directive_title = if info_string == ADMONISH_BLOCK_KEYWORD {
         ""
     } else {
@@ -230,7 +231,12 @@ fn parse_info_string(info_string: &str) -> Option<AdmonitionInfoRaw> {
         None => (directive, None),
         Some((directive, additional_classnames)) => (
             directive,
-            Some(additional_classnames.split(CLASSNAME_SEPARATOR).collect()),
+            Some(
+                additional_classnames
+                    .split(CLASSNAME_SEPARATOR)
+                    .filter(|additional_classname| !additional_classname.is_empty())
+                    .collect(),
+            ),
         ),
     };
 
@@ -280,7 +286,7 @@ fn extract_admonish_body(content: &str) -> &str {
 /// If the code block is not an admonition, return `None`.
 fn parse_admonition<'a>(info_string: &'a str, content: &'a str) -> Option<Admonition<'a>> {
     let info = parse_info_string(info_string)?;
-    let info = AdmonitionInfo::try_from(info).unwrap_or_default();
+    let info = AdmonitionInfo::from(info);
     let body = extract_admonish_body(content);
     Some(Admonition::new(info, body))
 }
@@ -629,6 +635,27 @@ Developers don't want you to know this one weird tip!
 
 Will have bonus classnames
 
+</div>
+</div>
+"#;
+
+        assert_eq!(expected, preprocess(content).unwrap());
+    }
+
+    #[test]
+    fn block_with_empty_additional_classnames_title_content() {
+        let content = r#"
+```admonish .... ""
+```
+"#;
+
+        let expected = r#"
+
+<div class="admonition note">
+<div>
+
+
+
 </div>
 </div>
 "#;