better parsing error reporting

src/cli/main.rs

@@ -110,7 +110,19 @@ fn parse_and_compile(opts: &PlayOpts) -> anyhow::Result<Vec<f64>> {
     info!("parsing tokens");
     let tokens = parser
         .parse_all(&input)
-        .map_err(|e| anyhow!("{e}"))
+        .map_err(|nom::error::Error { input, code }| {
+            anyhow!(
+                "{code:?} line {line} column {column} (at \"{at}\")",
+                code = code,
+                line = input.location_line(),
+                column = input.get_utf8_column(),
+                at = input
+                    .chars()
+                    .chain("...".chars())
+                    .take(10)
+                    .collect::<String>()
+            )
+        })
         .context("Failed to parse input")?;
     info!("found {} tokens", tokens.as_ref().len());
     if tokens.as_ref().is_empty() {

src/parser.rs

@@ -11,7 +11,7 @@ use nom::{
         complete::{char, space1, usize},
         streaming::one_of,
     },
-    combinator::{opt, value},
+    combinator::{all_consuming, opt, value},
     error::{Error, ParseError},
     multi::many0,
     sequence::{delimited, preceded},
@@ -81,7 +81,7 @@ where
             many0(value((), char('#').and(take_till(|c| c == '\n'))).or(value((), space1))),
         )
     };
-    many0(delimited(
+    all_consuming(many0(delimited(
         space_or_comment(),
         alt((
             Silence::parser().map(into_box),
@@ -93,7 +93,7 @@ where
             Slope::parser(parser).map(into_box),
         )),
         space_or_comment(),
-    ))
+    )))
     .map(Into::into)
 }