Allow defintions to follow a term without a blank line

src/parser/mod.rs

@@ -288,7 +288,7 @@ pub struct ExtensionOptions {
     /// let mut options = Options::default();
     /// options.extension.description_lists = true;
     /// assert_eq!(markdown_to_html("Term\n\n: Definition", &options),
-    ///            "<dl><dt>Term</dt>\n<dd>\n<p>Definition</p>\n</dd>\n</dl>\n");
+    ///            "<dl>\n<dt>Term</dt>\n<dd>\n<p>Definition</p>\n</dd>\n</dl>\n");
     /// ```
     pub description_lists: bool,
 
@@ -1503,10 +1503,13 @@ impl<'a, 'o, 'c: 'o> Parser<'a, 'o, 'c> {
                 container.data.borrow_mut().internal_offset = matched;
             } else if !indented
                 && self.options.extension.description_lists
-                && line[self.first_nonspace] == b':'
+                && unwrap_into(
+                    scanners::description_item_start(&line[self.first_nonspace..]),
+                    &mut matched,
+                )
                 && self.parse_desc_list_details(container)
             {
-                let offset = self.first_nonspace + 1 - self.offset;
+                let offset = self.first_nonspace + matched - self.offset;
                 self.advance_offset(line, offset, false);
                 if strings::is_space_or_tab(line[self.offset]) {
                     self.advance_offset(line, 1, true);
@@ -1748,10 +1751,17 @@ impl<'a, 'o, 'c: 'o> Parser<'a, 'o, 'c> {
         }
     }
 
-    fn parse_desc_list_details(&mut self, container: &mut &'a AstNode<'a>) -> bool {
+    fn parse_desc_list_details(&mut self, node: &mut &'a AstNode<'a>) -> bool {
+        let container = node;
+
         let last_child = match container.last_child() {
             Some(lc) => lc,
-            None => return false,
+            None => {
+                // Happens when the detail line is directly after the term,
+                // without a blank line between.
+                *container = container.parent().unwrap();
+                container.last_child().unwrap()
+            }
         };
 
         if node_matches!(last_child, NodeValue::Paragraph) {

src/scanners.re

@@ -431,4 +431,14 @@ pub fn tasklist(s: &[u8]) -> Option<(usize, u8)> {
 */
 }
 
+pub fn description_item_start(s: &[u8]) -> Option<usize> {
+    let mut cursor = 0;
+    let _marker = 0;
+    let len = s.len();
+/*!re2c
+    [:~] ([ \t]+|[\r\n])  { return Some(cursor); }
+    * { return None; }
+*/
+}
+
 // vim: set ft=rust:

src/tests/fixtures/description_lists.md

@@ -11,8 +11,9 @@ with `:` (after 0-2 spaces); subsequent lines must
 be indented unless they are lazy paragraph
 continuations.
 
-The list is tight if there is no blank line between
-the term and the first definition, otherwise loose.
+There is no distinction between a "tight" list or a
+"loose" list. Definitions are always wrapped in `<p>`
+tags.
 
 ```````````````````````````````` example
 apple
@@ -23,10 +24,12 @@ orange
 .
 <dl>
 <dt>apple</dt>
-<dd>red fruit
+<dd>
+<p>red fruit</p>
 </dd>
 <dt>orange</dt>
-<dd>orange fruit
+<dd>
+<p>orange fruit</p>
 </dd>
 </dl>
 ````````````````````````````````
@@ -65,10 +68,12 @@ orange
 .
 <dl>
 <dt>apple</dt>
-<dd>red fruit
+<dd>
+<p>red fruit</p>
 </dd>
 <dt>orange</dt>
-<dd>orange fruit
+<dd>
+<p>orange fruit</p>
 </dd>
 </dl>
 ````````````````````````````````
@@ -96,6 +101,8 @@ orange
 
 Multiple blocks in a definition:
 
+Note that the column 
+
 ```````````````````````````````` example
 *apple*
 
@@ -144,14 +151,17 @@ term
 <dt>term</dt>
 <dd>
 <ol>
-<li><p>Para one</p>
-<p>Para two</p></li>
+<li>
+<p>Para one</p>
+<p>Para two</p>
+</li>
 </ol>
 </dd>
 </dl>
 ````````````````````````````````
 
 Multiple definitions, tight:
+(always rendered as loose)
 
 ```````````````````````````````` example
 apple
@@ -164,14 +174,18 @@ orange
 .
 <dl>
 <dt>apple</dt>
-<dd>red fruit
+<dd>
+<p>red fruit</p>
 </dd>
-<dd>computer company
+<dd>
+<p>computer company</p>
 </dd>
 <dt>orange</dt>
-<dd>orange fruit
+<dd>
+<p>orange fruit</p>
 </dd>
-<dd>telecom company
+<dd>
+<p>telecom company</p>
 </dd>
 </dl>
 ````````````````````````````````
@@ -257,10 +271,12 @@ orange
 .
 <dl>
 <dt>apple</dt>
-<dd>red fruit
+<dd>
+<p>red fruit</p>
 </dd>
 <dt>orange</dt>
-<dd>orange fruit
+<dd>
+<p>orange fruit</p>
 </dd>
 </dl>
 ````````````````````````````````
@@ -299,10 +315,12 @@ bim
 <p>Foo</p>
 <dl>
 <dt>bar</dt>
-<dd>baz
+<dd>
+<p>baz</p>
 </dd>
 <dt>bim</dt>
-<dd>bor
+<dd>
+<p>bor</p>
 </dd>
 </dl>
 ````````````````````````````````