diff --git a/src/application.rs b/src/application.rs
new file mode 100644
index 0000000..d701a86
--- /dev/null
+++ b/src/application.rs
@@ -0,0 +1,80 @@
+use std::{path::PathBuf, sync::Arc};
+
+use iced::{
+    executor,
+    widget::{button, column, row, text, text_editor},
+    Application, Command, Element, Theme,
+};
+
+use crate::{
+    file::{default_file, load_file, pick_file},
+    Error,
+};
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    Open,
+    Edit(text_editor::Action),
+    FileOpened(Result<(PathBuf, Arc<String>), Error>),
+}
+
+pub struct BookManagerApp {
+    book_path: Option<PathBuf>,
+    book_content: text_editor::Content,
+    io_error: Option<Error>,
+}
+
+impl Application for BookManagerApp {
+    type Executor = executor::Default;
+    type Flags = ();
+    type Message = Message;
+    type Theme = Theme;
+
+    fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) {
+        (
+            Self {
+                book_path: None,
+                book_content: text_editor::Content::new(),
+                io_error: None,
+            },
+            Command::perform(load_file(default_file()), Message::FileOpened),
+        )
+    }
+
+    fn title(&self) -> String {
+        String::from("Thief Book Manager")
+    }
+
+    fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
+        match message {
+            Message::Edit(action) => self.book_content.perform(action),
+            Message::FileOpened(result) => match result {
+                Ok((path, content)) => {
+                    self.book_content = text_editor::Content::with_text(&content);
+                    self.book_path = Some(path);
+                }
+                Err(error) => self.io_error = Some(error),
+            },
+            Message::Open => {
+                return Command::perform(pick_file(), Message::FileOpened);
+            }
+        }
+
+        Command::none()
+    }
+
+    fn view(&self) -> Element<'_, Self::Message> {
+        let hello_world = text("Hello, world!");
+        let controls = row![button("Open").on_press(Message::Open)];
+        let active_editor = text_editor(&self.book_content).on_action(Message::Edit);
+
+        column![hello_world, controls, active_editor]
+            .spacing(10)
+            .padding(10)
+            .into()
+    }
+
+    fn theme(&self) -> Theme {
+        Theme::Dark
+    }
+}
diff --git a/src/file.rs b/src/file.rs
new file mode 100644
index 0000000..01796b4
--- /dev/null
+++ b/src/file.rs
@@ -0,0 +1,25 @@
+use std::{path::PathBuf, sync::Arc};
+
+use crate::Error;
+
+pub async fn load_file(path: PathBuf) -> Result<(PathBuf, Arc<String>), Error> {
+    let content = tokio::fs::read_to_string(&path)
+        .await
+        .map(Arc::new)
+        .map_err(|error| error.kind())
+        .map_err(Error::IO)?;
+    Ok((path, content))
+}
+
+pub async fn pick_file() -> Result<(PathBuf, Arc<String>), Error> {
+    let file_handle = rfd::AsyncFileDialog::new()
+        .set_title("Choose a file...")
+        .pick_file()
+        .await
+        .ok_or(Error::DialogClosed)?;
+    load_file(file_handle.path().to_owned()).await
+}
+
+pub fn default_file() -> PathBuf {
+    PathBuf::from(format!("{}/src/main.rs", env!("CARGO_MANIFEST_DIR")))
+}
diff --git a/src/main.rs b/src/main.rs
index 6c07273..effbee3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,78 +1,10 @@
-use std::{io, path::PathBuf, sync::Arc};
+mod application;
+mod file;
 
-use iced::{
-    executor,
-    widget::{button, column, row, text, text_editor},
-    Application, Command, Element, Settings, Theme,
-};
+use std::io;
 
-#[derive(Debug, Clone)]
-enum Message {
-    Open,
-    Edit(text_editor::Action),
-    FileOpened(Result<(PathBuf, Arc<String>), Error>),
-}
-
-struct BookManagerApp {
-    book_path: Option<PathBuf>,
-    book_content: text_editor::Content,
-    io_error: Option<Error>,
-}
-
-impl Application for BookManagerApp {
-    type Executor = executor::Default;
-    type Flags = ();
-    type Message = Message;
-    type Theme = Theme;
-
-    fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) {
-        (
-            Self {
-                book_path: None,
-                book_content: text_editor::Content::new(),
-                io_error: None,
-            },
-            Command::perform(load_file(default_file()), Message::FileOpened),
-        )
-    }
-
-    fn title(&self) -> String {
-        String::from("Thief Book Manager")
-    }
-
-    fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
-        match message {
-            Message::Edit(action) => self.book_content.perform(action),
-            Message::FileOpened(result) => match result {
-                Ok((path, content)) => {
-                    self.book_content = text_editor::Content::with_text(&content);
-                    self.book_path = Some(path);
-                }
-                Err(error) => self.io_error = Some(error),
-            },
-            Message::Open => {
-                return Command::perform(pick_file(), Message::FileOpened);
-            }
-        }
-
-        Command::none()
-    }
-
-    fn view(&self) -> Element<'_, Self::Message> {
-        let hello_world = text("Hello, world!");
-        let controls = row![button("Open").on_press(Message::Open)];
-        let active_editor = text_editor(&self.book_content).on_action(Message::Edit);
-
-        column![hello_world, controls, active_editor]
-            .spacing(10)
-            .padding(10)
-            .into()
-    }
-
-    fn theme(&self) -> Theme {
-        Theme::Dark
-    }
-}
+use application::BookManagerApp;
+use iced::{Application, Settings};
 
 fn main() -> iced::Result {
     BookManagerApp::run(Settings::default())
@@ -83,25 +15,3 @@ enum Error {
     DialogClosed,
     IO(io::ErrorKind),
 }
-
-async fn load_file(path: PathBuf) -> Result<(PathBuf, Arc<String>), Error> {
-    let content = tokio::fs::read_to_string(&path)
-        .await
-        .map(Arc::new)
-        .map_err(|error| error.kind())
-        .map_err(Error::IO)?;
-    Ok((path, content))
-}
-
-async fn pick_file() -> Result<(PathBuf, Arc<String>), Error> {
-    let file_handle = rfd::AsyncFileDialog::new()
-        .set_title("Choose a file...")
-        .pick_file()
-        .await
-        .ok_or(Error::DialogClosed)?;
-    load_file(file_handle.path().to_owned()).await
-}
-
-fn default_file() -> PathBuf {
-    PathBuf::from(format!("{}/src/main.rs", env!("CARGO_MANIFEST_DIR")))
-}