From 2fa7e467549d9c4499932a48663034e173ec02b1 Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin@worthe-it.co.za>
Date: Thu, 30 Nov 2017 21:23:08 +0200
Subject: Set up base repo with common file reading and CLI

---
 .gitignore       |  3 +++
 Cargo.toml       |  9 +++++++++
 src/bin/day_1.rs |  8 ++++++++
 src/lib.rs       | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 81 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.toml
 create mode 100644 src/bin/day_1.rs
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6aa1064
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target/
+**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..814e77e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "advent_of_code_2017"
+version = "0.1.0"
+authors = ["Justin Worthe <justin@worthe-it.co.za>"]
+
+[dependencies]
+regex = "0.2.3"
+structopt = "0.1.6"
+structopt-derive = "0.1.6"
\ No newline at end of file
diff --git a/src/bin/day_1.rs b/src/bin/day_1.rs
new file mode 100644
index 0000000..7bcfcee
--- /dev/null
+++ b/src/bin/day_1.rs
@@ -0,0 +1,8 @@
+extern crate advent_of_code_2017;
+use advent_of_code_2017::*;
+
+fn main() {
+    let args = AdventArgs::init();
+    
+    println!("{:?} {:?}", args.part, args.input);
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..c5a0f16
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,61 @@
+extern crate structopt;
+#[macro_use]
+extern crate structopt_derive;
+use structopt::StructOpt;
+
+use std::path::PathBuf;
+use std::io::BufReader;
+use std::io::prelude::*;
+use std::fs::File;
+use std::process;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "AOC2017", about = "An Advent of Code CLI arguments object.")]
+struct AdventCli {
+    #[structopt(help = "Which part of the puzzle you are solving")]
+    part: u32,
+
+    #[structopt(help = "Input file", parse(from_os_str))]
+    input: PathBuf
+}
+
+pub struct AdventArgs {
+    pub part: u32,
+    pub input: Vec<String>
+}
+
+impl AdventArgs {
+    pub fn init() -> AdventArgs {
+        let opt = AdventCli::from_args();
+        let input = match AdventArgs::read_file(&opt.input) {
+            Ok(input) => input,
+            Err(error) => {
+                // Typically I would think of exiting the program like
+                // this to be bad form, but in this case I'm matching the
+                // interface of StructOpt: if the input parameters were
+                // invalid, just quit now with a nice message.
+                eprintln!("Error reading file: {}", error);
+                process::exit(1);
+            }
+        };
+        AdventArgs {
+            part: opt.part,
+            input: input
+        }
+    }
+
+    fn read_file(file: &PathBuf) -> Result<Vec<String>, std::io::Error> {
+        let file = File::open(file)?;
+        let file_reader = BufReader::new(file);
+        file_reader.lines()
+            .collect::<Result<Vec<_>, _>>()
+            .map(AdventArgs::preprocess_file_lines)
+    }
+
+    fn preprocess_file_lines(lines: Vec<String>) -> Vec<String> {
+        lines.iter()
+            .filter(|line| line.len() > 0)
+            .map(|line| line.trim().to_string())
+            .collect()
+    }
+}
-- 
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