Initialize advent of code repo

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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Cargo.toml

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+[package]
+name = "advent-of-code-2019"
+version = "0.1.0"
+authors = ["Andrew Swistak <andrew@andrewswistak.com>"]
+edition = "2018"
+
+[dependencies.clap]
+version = "~2.33"
+features = ["yaml"]

src/cli.yml

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+name: aoc
+version: "1.0"
+author: Andrew Swistak <andrew@andrewswistak.com>
+about: Does awesome things
+args:
+    - day:
+        short: d
+        long: day
+        value_name: day number
+        help: The day of advent of code to run puzzles for
+        takes_value: true
+    - puzzle:
+        short: p
+        long: puzzle
+        value_name: puzzle number
+        help: Puzzle one or puzzle two to run for the given day
+        takes_value: true

src/day_1/mod.rs

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+pub mod puzzle_1;
+pub mod puzzle_2;

src/day_1/puzzle_1.rs

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+pub fn solve() {
+    println!("NYI");
+}

src/day_1/puzzle_1.txt

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src/day_1/puzzle_2.rs

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+pub fn solve() {
+    println!("NYI");
+}

src/main.rs

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+#[macro_use]
+extern crate clap;
+
+mod day_1;
+
+fn main() {
+    use clap::App;
+
+    let yml = load_yaml!("cli.yml");
+    let matches = App::from_yaml(yml).get_matches();
+
+    let day = opt_str_to_int(matches.value_of("day"));
+    let puzzle = opt_str_to_int(matches.value_of("puzzle"));
+
+    match day {
+        d if d == 1 => match puzzle {
+            p if p == 1 => day_1::puzzle_1::solve(),
+            p if p == 2 => day_1::puzzle_2::solve(),
+            _ => println!("unavailable puzzle given!"),
+        },
+        _ => println!("unavailable day given!"),
+    }
+}
+
+fn opt_str_to_int(val: Option<&str>) -> i32 {
+    match val {
+        Some(val) => val.parse::<i32>().unwrap(),
+        None => panic!("value not supplied! type --help"),
+    }
+}