diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..bc647dc
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,46 @@
+use std::{
+	str::FromStr,
+};
+
+type Result <T> = std::result::Result <T, crate::error::Error>;
+
+pub struct Config {
+	pub interval_secs: u64,
+	pub prompt: String,
+}
+
+impl Default for Config {
+	fn default () -> Self {
+		Self {
+			interval_secs: 2225,
+			prompt: "Write a journal entry, then hit Tab, Enter to submit it.".into (),
+		}
+	}
+}
+
+impl Config {
+	pub fn from_args <I: Iterator <Item=String>> (mut args: I) -> Result <Self> {
+		use crate::error::Error::{
+			CannotParseArg,
+			ParamNeedsArg,
+		};
+		
+		let mut that = Self::default ();
+		
+		// Finally found the difference: https://stackoverflow.com/questions/1788923/parameter-vs-argument
+		
+		while let Some (arg) = args.next () {
+			if arg == "--interval-secs" {
+				let val = args.next ().ok_or (ParamNeedsArg ("--interval-secs"))?;
+				let val = u64::from_str (&val).map_err (|_| CannotParseArg ("--interval-secs <u64>"))?;
+				that.interval_secs = val;
+			}
+			else if arg == "--prompt" {
+				let val = args.next ().ok_or (ParamNeedsArg ("--prompt"))?;
+				that.prompt = val;
+			}
+		}
+		
+		Ok (that)
+	}
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..9cfbf92
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,17 @@
+use fltk::prelude::*;
+
+#[derive (thiserror::Error, Debug)]
+pub enum Error {
+	#[error ("46MVLSEL Cannot parse argument: {0}")]
+	CannotParseArg (&'static str),
+	#[error ("4JZ5B2FN Editor has no buffer, this should be impossible")]
+	EditorHasNoBuffer,
+	#[error ("OKE7Z5O6 FLTK: {0}")]
+	Fltk (#[from] FltkError),
+	#[error ("4BQPBIAJ IO")]
+	Io (#[from] std::io::Error),
+	#[error ("KDP4DNOP JSON serialization failed")]
+	JsonSerialization (#[from] serde_json::Error),
+	#[error ("3MYHBQWV Parameter {0} needs an argument")]
+	ParamNeedsArg (&'static str),
+}
diff --git a/src/main.rs b/src/main.rs
index 2265dbe..5fc7228 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,5 @@
 use std::{
-	str::FromStr,
+	env,
 };
 
 use chrono::{
@@ -25,25 +25,15 @@ use tokio::{
 	},
 };
 
+mod config;
+mod error;
+
+use config::Config;
+use error::Error;
+
 #[tokio::main]
 async fn main () -> Result <(), Error> {
-	let mut config = Config::default ();
-	
-	let mut args = std::env::args ();
-	
-	// Finally found the difference: https://stackoverflow.com/questions/1788923/parameter-vs-argument
-	
-	while let Some (arg) = args.next () {
-		if arg == "--interval-secs" {
-			let val = args.next ().ok_or (Error::ParamNeedsArg ("--interval-secs"))?;
-			let val = u64::from_str (&val).map_err (|_| Error::CannotParseArg ("--interval-secs <u64>"))?;
-			config.interval_secs = val;
-		}
-		else if arg == "--prompt" {
-			let val = args.next ().ok_or (Error::ParamNeedsArg ("--prompt"))?;
-			config.prompt = val;
-		}
-	}
+	let config = Config::from_args (env::args ())?;
 	
 	let (fltk_tx, fltk_rx) = app::channel::<Message> ();
 	
@@ -85,42 +75,12 @@ async fn main () -> Result <(), Error> {
 	Ok (())
 }
 
-struct Config {
-	interval_secs: u64,
-	prompt: String,
-}
-
-impl Default for Config {
-	fn default () -> Self {
-		Self {
-			interval_secs: 2225,
-			prompt: "Write a journal entry, then hit Tab, Enter to submit it.".into (),
-		}
-	}
-}
-
 #[derive (Clone, Copy)]
 enum Message {
 	PopUp,
 	Submit,
 }
 
-#[derive (thiserror::Error, Debug)]
-enum Error {
-	#[error ("46MVLSEL Cannot parse argument: {0}")]
-	CannotParseArg (&'static str),
-	#[error ("4JZ5B2FN Editor has no buffer, this should be impossible")]
-	EditorHasNoBuffer,
-	#[error ("OKE7Z5O6 FLTK: {0}")]
-	Fltk (#[from] FltkError),
-	#[error ("4BQPBIAJ IO")]
-	Io (#[from] std::io::Error),
-	#[error ("KDP4DNOP JSON serialization failed")]
-	JsonSerialization (#[from] serde_json::Error),
-	#[error ("3MYHBQWV Parameter {0} needs an argument")]
-	ParamNeedsArg (&'static str),
-}
-
 #[derive (serde::Serialize)]
 struct JournalLine {
 	text: String,