From 5b5d87966e6dfbd8cef3bcac9546664590d43d9e Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Mon, 7 Jan 2019 19:33:11 +0000
Subject: Implement argument handling according to spec

---
 Cargo.lock  | 10 ++++++++++
 Cargo.toml  |  1 +
 src/main.rs | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 24d0405..3f41163 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,4 +1,14 @@
+[[package]]
+name = "argparse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "nitrocli-otp-qr"
 version = "0.1.0"
+dependencies = [
+ "argparse 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
+[metadata]
+"checksum argparse 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3f8ebf5827e4ac4fd5946560e6a99776ea73b596d80898f357007317a7141e47"
diff --git a/Cargo.toml b/Cargo.toml
index bd186ec..8dec924 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,4 @@ readme = "README.md"
 license = "MIT"
 
 [dependencies]
+argparse = "0.2"
diff --git a/src/main.rs b/src/main.rs
index e257956..04140ed 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,50 @@
+#![warn(missing_docs, rust_2018_compatibility, rust_2018_idioms, unused)]
+
+//! Reads OTP configuration from a QR code and writes it to an OTP slot on a Nitrokey device.
+
+use std::process;
+
+#[derive(Debug)]
+struct Options {
+    slot: u8,
+    file: Option<String>,
+    name: Option<String>,
+}
+
+fn parse_options() -> Result<Options, i32> {
+    let mut options = Options {
+        slot: 0,
+        file: None,
+        name: None,
+    };
+    let mut parser = argparse::ArgumentParser::new();
+    parser.set_description(
+        "Reads OTP configuration from a QR code and writes it to an OTP slot on a Nitrokey device.",
+    );
+    parser.refer(&mut options.slot).required().add_argument(
+        "slot",
+        argparse::Store,
+        "The slot to write the OTP data to",
+    );
+    parser.refer(&mut options.file).add_argument(
+        "file",
+        argparse::StoreOption,
+        "The file to read the QR code from",
+    );
+    parser.refer(&mut options.name).add_option(
+        &["-n", "--name"],
+        argparse::StoreOption,
+        "The name to store in the OTP slot",
+    );
+    parser.parse_args()?;
+    drop(parser);
+    Ok(options)
+}
+
 fn main() {
-    println!("nitrocli-otp-qr");
+    let status = match parse_options() {
+        Ok(_) => 0,
+        Err(err) => err,
+    };
+    process::exit(status);
 }
-- 
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