start with bare basics

src/utils.rs

@@ -0,0 +1,13 @@
+use winnow::ascii::space0;
+// from https://docs.rs/winnow/latest/winnow/_topic/language/index.html#whitespace
+use winnow::prelude::*;
+use winnow::{ascii::multispace0, combinator::delimited, error::ParserError};
+
+/// A combinator that takes a parser `inner` and produces a parser that also consumes both leading and
+/// trailing whitespace, returning the output of `inner`.
+pub fn ws<'a, F, O, E: ParserError<&'a str>>(inner: F) -> impl Parser<&'a str, O, E>
+where
+    F: Parser<&'a str, O, E>,
+{
+    delimited(space0, inner, space0)
+}