Add basic framework

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
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+ "winapi",
+]
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+ "clap",
+]
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+ "libc",
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+ "atty",
+ "bitflags",
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+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
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+name = "winapi-i686-pc-windows-gnu"
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Cargo.toml

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+[package]
+name = "aoc_2020"
+version = "0.1.0"
+authors = ["Oliver Youle <youle.oliver@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+clap = "~2.33.3"

src/main.rs

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+extern crate clap;
+use clap::App;
+
+use std::fs;
+use std::process;
+
+pub mod solution;
+
+use solution::day1::Day1;
+use solution::Solution;
+
+fn main() {
+    let opts = App::new("Advent of Code Solutions 2020")
+        .author("Oliver Youle")
+        .args_from_usage(
+            "-d, --day=<DAY_OF_MONTH> 'The number of the solution to run'
+             -i, --input=<FILE_PATH>  'Path to the problem input'",
+        )
+        .get_matches();
+
+    let day: u8 = match opts.value_of("day").unwrap().parse::<u8>() {
+        Ok(n) => n,
+        Err(_e) => {
+            println!("The provided day is not a valid");
+            process::exit(1);
+        }
+    };
+
+    let filename = opts.value_of("input").unwrap();
+    let input_text = match fs::read_to_string(filename) {
+        Ok(i) => i,
+        Err(e) => {
+            println!("Error reading from input file: {}", e);
+            process::exit(1);
+        }
+    };
+
+    let input: Vec<&str> = input_text.split("\n").filter(|s| !s.is_empty()).collect();
+
+    let solution = match day {
+        1 => Day1 {},
+        _ => {
+            println!("Solution not available for day {}", day);
+            process::exit(1);
+        }
+    };
+
+    println!("part 1: {}", solution.part_1(&input));
+    println!("part 2: {}", solution.part_2(&input));
+}

src/solution/mod.rs

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+pub trait Solution {
+    fn part_1(&self, input: &Vec<&str>) -> String;
+    fn part_2(&self, input: &Vec<&str>) -> String;
+}
+
+pub mod day1;