infra: Set up day runner

.gitignore

···
+/inputs
+/target

Cargo.lock

···
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+]

Cargo.toml

···
+[package]
+name = "aoc2025"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.100"
+
+[dev-dependencies]
+proptest = "1.9.0"

bacon.toml

···
+# This is a configuration file for the bacon tool
+#
+# Complete help on configuration: https://dystroy.org/bacon/config/
+#
+# You may check the current default at
+#   https://github.com/Canop/bacon/blob/main/defaults/default-bacon.toml
+
+default_job = "check"
+env.CARGO_TERM_COLOR = "always"
+
+[jobs.check]
+command = ["cargo", "check"]
+need_stdout = false
+
+[jobs.check-all]
+command = ["cargo", "check", "--all-targets"]
+need_stdout = false
+
+# Run clippy on the default target
+[jobs.clippy]
+command = ["cargo", "clippy"]
+need_stdout = false
+
+# Run clippy on all targets
+# To disable some lints, you may change the job this way:
+#    [jobs.clippy-all]
+#    command = [
+#        "cargo", "clippy",
+#        "--all-targets",
+#    	 "--",
+#    	 "-A", "clippy::bool_to_int_with_if",
+#    	 "-A", "clippy::collapsible_if",
+#    	 "-A", "clippy::derive_partial_eq_without_eq",
+#    ]
+# need_stdout = false
+[jobs.clippy-all]
+command = ["cargo", "clippy", "--all-targets"]
+need_stdout = false
+
+# This job lets you run
+# - all tests: bacon test
+# - a specific test: bacon test -- config::test_default_files
+# - the tests of a package: bacon test -- -- -p config
+[jobs.test]
+command = ["cargo", "test"]
+need_stdout = true
+
+[jobs.nextest]
+command = [
+    "cargo", "nextest", "run",
+    "--hide-progress-bar", "--failure-output", "final"
+]
+need_stdout = true
+analyzer = "nextest"
+
+[jobs.doc]
+command = ["cargo", "doc", "--no-deps"]
+need_stdout = false
+
+# If the doc compiles, then it opens in your browser and bacon switches
+# to the previous job
+[jobs.doc-open]
+command = ["cargo", "doc", "--no-deps", "--open"]
+need_stdout = false
+on_success = "back" # so that we don't open the browser at each change
+
+# You can run your application and have the result displayed in bacon,
+# if it makes sense for this crate.
+[jobs.run]
+command = [
+    "cargo", "run",
+    # put launch parameters for your program behind a `--` separator
+]
+need_stdout = true
+allow_warnings = true
+background = true
+
+# Run your long-running application (eg server) and have the result displayed in bacon.
+# For programs that never stop (eg a server), `background` is set to false
+# to have the cargo run output immediately displayed instead of waiting for
+# program's end.
+# 'on_change_strategy' is set to `kill_then_restart` to have your program restart
+# on every change (an alternative would be to use the 'F5' key manually in bacon).
+# If you often use this job, it makes sense to override the 'r' key by adding
+# a binding `r = job:run-long` at the end of this file .
+# A custom kill command such as the one suggested below is frequently needed to kill
+# long running programs (uncomment it if you need it)
+[jobs.run-long]
+command = [
+    "cargo", "run",
+    # put launch parameters for your program behind a `--` separator
+]
+need_stdout = true
+allow_warnings = true
+background = false
+on_change_strategy = "kill_then_restart"
+# kill = ["pkill", "-TERM", "-P"]
+
+# This parameterized job runs the example of your choice, as soon
+# as the code compiles.
+# Call it as
+#    bacon ex -- my-example
+[jobs.ex]
+command = ["cargo", "test", "--example"]
+need_stdout = true
+allow_warnings = true
+
+# You may define here keybindings that would be specific to
+# a project, for example a shortcut to launch a specific job.
+# Shortcuts to internal functions (scrolling, toggling, etc.)
+# should go in your personal global prefs.toml file instead.
+[keybindings]
+# alt-m = "job:my-job"
+c = "job:clippy-all" # comment this to have 'c' run clippy on only the default target

src/lib.rs

···
+use std::{fmt::Display, fs, time::Instant};
+
+use anyhow::Result;
+
+pub fn run<T, U, V, P, F1, F2>(name: &str, path: &str, parse: P, part1: F1, part2: F2) -> Result<()>
+where
+    T: Clone,
+    U: Display,
+    V: Display,
+    P: Fn(&str) -> T,
+    F1: Fn(T) -> U,
+    F2: Fn(T) -> V,
+{
+    println!("{}\n{}\n", name, "-".repeat(name.len()));
+
+    let read_timer = Instant::now();
+    let input = fs::read_to_string(path)?;
+    println!("Read input in:   {:?}", read_timer.elapsed());
+
+    let parse_timer = Instant::now();
+    let input = parse(&input);
+    println!("Parsed input in: {:?}\n", parse_timer.elapsed());
+
+    let part1_timer = Instant::now();
+    println!("Part 1 answer:   {}", part1(input.clone()));
+    println!("Finished in:     {:?}\n", part1_timer.elapsed());
+
+    let part2_timer = Instant::now();
+    println!("Part 2 answer:   {}", part2(input.clone()));
+    println!("Finished in:     {:?}", part2_timer.elapsed());
+
+    Ok(())
+}