Implement 2022 day 1

2022/src/common.rs

@@ -0,0 +1,19 @@
+//! Common helper utilities to all days
+
+use anyhow::Result;
+use nom::Finish;
+use nom::Parser;
+
+/// Parse input from some nom parser and return as an anyhow result
+///
+/// This method exists as a convenience because nom's errors cannot otherwise be easily converted to
+/// an anyhow error, and I don't want to keep track of custom error implementations here.
+pub fn parse_input<'a, O>(
+    input: &'a [u8],
+    mut parser: impl Parser<&'a [u8], O, nom::error::Error<&'a [u8]>>,
+) -> Result<O> {
+    match parser.parse(input).finish() {
+        Ok((_, value)) => Ok(value),
+        Err(err) => anyhow::bail!("Failed to parse at: {err:?}"),
+    }
+}