Tweaked list paragraph interruption. Only interrupt in nested list.

Author: FritsvanCampen

README.md

@@ -109,9 +109,13 @@ are two small differences with Pandoc's syntax:
 * This plugin does not support list numbers enclosed in parentheses,
   as the Commonmark spec does not support these either for lists
   numbered with Arabic numerals.
-* Pandoc and Commonmark do not agree whether a list is allowed to
-  interrupt a paragraph. It also depends on if that list is nested or not.
-  This plugin always allows a paragraph to be interrupted.
+* Pandoc does not allow any list to interrupt a paragraph. In the
+  spirit of the Commonmark spec (which allows only lists starting
+  with 1 to interrupt a paragraph), this plugins allows lists that
+  start with "A", "a", "I" or "i" (i.e. all 'first numerals') to
+  interrupt a paragraph. The same holds for the "#" generic numbered
+  list item marker.
+  For nested lists, any start number can interrupt a paragraph.
 
 Configuration
 -------------

src/index.ts

@@ -276,6 +276,12 @@ const createFancyList = (options: MarkdownItFancyListPluginOptions) => {
 			return false;
 		}
 
+		// do not allow subsequent numbers to interrupt paragraphs in non-nested lists
+		const isNestedList = state.listIndent !== -1;
+		if (isTerminatingParagraph && marker.start !== 1 && isNestedList === false) {
+			return false;
+		}
+
 		// If we're starting a new unordered list right after
 		// a paragraph, first line should not be empty.
 		if (isTerminatingParagraph) {

test/index.ts

@@ -289,7 +289,7 @@ iii. a plane ticket
 		await assertHTML(expectedHtml, markdown);
 	});
 
-	it("allows subsequent numbers to interrupt paragraphs", async () => {
+	it("does not allow subsequent numbers to interrupt paragraphs", async () => {
 		const markdown = `
 I need to buy
 b. new shoes
@@ -302,19 +302,14 @@ iii. a coat
 iv. a plane ticket
 `;
 		const expectedHtml = `
-<p>I need to buy</p>
-<ol type="a" start="2">
-  <li>new shoes</li>
-  <li>a coat</li>
-  <li>a plane ticket</li>
-</ol>
-<p>I also need to buy</p>
-<ol type="i" start="2">
-  <li>new shoes</li>
-  <li>a coat</li>
-  <li>a plane ticket</li>
-</ol>
-
+<p>I need to buy
+b. new shoes
+c. a coat
+d. a plane ticket</p>
+<p>I also need to buy
+ii. new shoes
+iii. a coat
+iv. a plane ticket</p>
 `;
 		await assertHTML(expectedHtml, markdown);
 	});