updating templates to use error_stack and thiserror

template/day-n/Cargo.toml

@@ -7,11 +7,13 @@ repository.workspace = true
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+
 [dependencies]
-nom = { workspace = true }
-itertools = {workspace = true }
-error-stack = {workspace = true}
+nom.workspace = true
+itertools.workspace = true
+log.workspace = true
+error-stack.workspace = true
+thiserror.workspace = true
 
 [dev-dependencies]
-test-log = {workspace=true}
-
+test-log.workspace = true

template/day-n/src/main.rs

@@ -3,10 +3,22 @@
 use {{ crate_name }}::part1;
 use {{ crate_name }}::part2;
 
-fn main() {
-    let input = include_str!("./input.txt");
-    let part1_result = part1(input).expect("part 1 should have no error");
-    println!("part 1: {part1_result}");
-    let part2_result = part2(input).expect("part 2 should have no error");
-    println!("part 2: {part2_result}");
+use error_stack::{Result, ResultExt};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+enum {{ project-name | upper_camel_case }}Error {
+    #[error("Part 1 failed")]
+    Part1Error,
+    #[error("Part 2 failed")]
+    Part2Error,
+}
+
+fn main() -> Result<(), {{ project-name | upper_camel_case }}Error> {
+    let input = include_str!("./input.txt");
+    let part1_result = part1(input).change_context({{ project-name | upper_camel_case }}Error::Part1Error)?;
+    println!("part 1: {part1_result}");
+    let part2_result = part2(input).change_context({{ project-name | upper_camel_case }}Error::Part2Error)?;
+    println!("part 2: {part2_result}");
+    Ok(())
 }

template/day-n/src/part1.rs

@@ -1,19 +1,13 @@
 #![warn(clippy::all, clippy::pedantic)]
 
-use std::fmt::Display;
-
-use error_stack::{Context, Result};
+use error_stack::Result;
+use thiserror::Error;
 
 // {{project-name}}
-#[derive(Debug)]
-pub struct {{project-name|upper_camel_case}}Part1Error;
-
-impl Context for {{project-name|upper_camel_case}}Part1Error {}
-
-impl Display for {{project-name|upper_camel_case}}Part1Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "day 1 part 1 error")
-    }
+#[derive(Debug, Error)]
+pub enum {{ project-name | upper_camel_case }}Part1Error{
+    #[error("Problem parsing {{ project-name | title_case }}")]
+    ParseError,
 }
 
 pub fn part1 (_input: &str) -> Result<String, {{ project-name | upper_camel_case }}Part1Error> {

template/day-n/src/part2.rs

@@ -1,18 +1,13 @@
 #![warn(clippy::all, clippy::pedantic)]
 
-use std::fmt::Display;
+use error_stack::Result;
+use thiserror::Error;
 
-use error_stack::{Context, Result};
-
-#[derive(Debug)]
-pub struct {{ project-name | upper_camel_case }}Part2Error;
-
-impl Context for {{ project-name | upper_camel_case }}Part2Error {}
-
-impl Display for {{ project-name | upper_camel_case }}Part2Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "day 1 part 1 error")
-    }
+// {{project-name}}
+#[derive(Debug, Error)]
+pub enum {{ project-name | upper_camel_case }}Part2Error{
+    #[error("Problem parsing {{project-name | title_case }}")]
+    ParseError,
 }
 
 pub fn part2 (_input: &str) -> Result<String, {{ project-name | upper_camel_case }}Part2Error> {

template/year-n/Cargo.toml

@@ -25,6 +25,7 @@ num-traits = "0.2.17"
 rustworkx-core = "0.13.2"
 pathfinding = "4.8.0"
 test-log = {version="0.2.14", features=["default", "unstable"]}
+thiserror = "1.0.56"
 
 
 [profile.dhat]