Add aoc crate that reads file from input argument; use it in the day01 crate

2022/aoc/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc"
+version = "0.1.0"

2022/aoc/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "aoc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2022/aoc/src/lib.rs

@@ -0,0 +1,8 @@
+use std::{env, fs};
+
+pub fn read_input_file_to_string() -> String {
+    let args: Vec<String> = env::args().collect();
+    let filename = args.get(1).expect("Missing filename argument");
+    fs::read_to_string(&filename).expect("Unable to read file")
+}
+

2022/day01/Cargo.lock

@@ -2,6 +2,13 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aoc"
+version = "0.1.0"
+
 [[package]]
 name = "day1"
 version = "0.1.0"
+dependencies = [
+ "aoc",
+]

2022/day01/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+aoc = { path = "../aoc" }

2022/day01/src/main.rs

@@ -1,5 +1,4 @@
-use std::env;
-use std::fs;
+use aoc;
 use std::str::Lines;
 
 fn get_calorie_totals(lines: Lines) -> Vec<u32> {
@@ -23,12 +22,9 @@ fn get_calorie_totals(lines: Lines) -> Vec<u32> {
 }
 
 fn main() {
-    let args: Vec<String> = env::args().collect();
-
-    let filename = args.get(1).expect("Missing filename argument");
-
-    let file_contents = fs::read_to_string(&filename).expect("Unable to read file");
+    let file_contents = aoc::read_input_file_to_string();
     let lines = file_contents.lines();
+
     let elves = get_calorie_totals(lines);
 
     println!(