Add parsers for lines that are indented less than or equal to the current line item's indent.

src/parser/plain_list.rs

@@ -10,11 +10,14 @@ use nom::combinator::not;
 use nom::combinator::opt;
 use nom::combinator::peek;
 use nom::combinator::recognize;
+use nom::combinator::verify;
 use nom::multi::many0_count;
 use nom::multi::many1;
 use nom::sequence::tuple;
 
 use super::combinator::context_many_till;
+use super::error::CustomError;
+use super::error::MyError;
 use super::error::Res;
 use super::paragraph::paragraph_end;
 use super::parser_context::ContextElement;
@@ -115,3 +118,26 @@ pub fn item_end<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, &'
         recognize(tuple((line_ending, peek(item_matcher)))),
     ))(i)
 }
+
+fn line_indented_lte<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, &'s str> {
+    let current_item_indent_level: &usize = get_context_item_indent(context).ok_or(
+        nom::Err::Error(CustomError::MyError(MyError("NotInPlainListItem"))),
+    )?;
+
+    let matched = recognize(verify(
+        tuple((line_ending::<&str, _>, space0, anychar)),
+        |(_newline, _space0, _anychar)| _space0.len() <= *current_item_indent_level,
+    ))(i)?;
+
+    Ok(matched)
+}
+
+fn get_context_item_indent<'r, 's>(context: Context<'r, 's>) -> Option<&'r usize> {
+    for thing in context.iter() {
+        match thing.get_data() {
+            ContextElement::ListItem(depth) => return Some(depth),
+            _ => {}
+        };
+    }
+    None
+}