diff --git a/src/app.rs b/src/app.rs
index a7f0018f..c7e8a9d2 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -4,7 +4,7 @@ use console::Term;
 use errors::*;
 use std::collections::HashSet;
 use std::env;
-use {OutputComponent, OutputComponents};
+use style::{OutputComponent, OutputComponents};
 
 pub struct App {
     pub matches: ArgMatches<'static>,
diff --git a/src/main.rs b/src/main.rs
index 6ece21a4..e0639af0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,13 +21,12 @@ mod app;
 mod assets;
 mod diff;
 mod printer;
+mod style;
 mod terminal;
 
-use std::collections::HashSet;
 use std::fs::{self, File};
 use std::io::{self, BufRead, BufReader, Write};
 use std::process::{self, Child, Command, Stdio};
-use std::str::FromStr;
 
 #[cfg(unix)]
 use std::os::unix::fs::FileTypeExt;
@@ -50,102 +49,11 @@ mod errors {
             Clap(::clap::Error);
             Io(::std::io::Error);
         }
-
-        errors {
-            NoCorrectStylesSpecified {
-                description("no correct styles specified")
-            }
-
-            UnknownStyleName(name: String) {
-                description("unknown style name")
-                display("unknown style name: '{}'", name)
-            }
-        }
     }
 }
 
 use errors::*;
 
-#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
-pub enum OutputComponent {
-    Auto,
-    Changes,
-    Grid,
-    Header,
-    Numbers,
-    Full,
-    Plain,
-}
-
-impl OutputComponent {
-    fn components(&self, interactive_terminal: bool) -> &'static [OutputComponent] {
-        match *self {
-            OutputComponent::Auto => if interactive_terminal {
-                OutputComponent::Full.components(interactive_terminal)
-            } else {
-                OutputComponent::Plain.components(interactive_terminal)
-            },
-            OutputComponent::Changes => &[OutputComponent::Changes],
-            OutputComponent::Grid => &[OutputComponent::Grid],
-            OutputComponent::Header => &[OutputComponent::Header],
-            OutputComponent::Numbers => &[OutputComponent::Numbers],
-            OutputComponent::Full => &[
-                OutputComponent::Changes,
-                OutputComponent::Grid,
-                OutputComponent::Header,
-                OutputComponent::Numbers,
-            ],
-            OutputComponent::Plain => &[],
-        }
-    }
-}
-
-impl FromStr for OutputComponent {
-    type Err = Error;
-
-    fn from_str(s: &str) -> Result<Self> {
-        match s {
-            "auto" => Ok(OutputComponent::Auto),
-            "changes" => Ok(OutputComponent::Changes),
-            "grid" => Ok(OutputComponent::Grid),
-            "header" => Ok(OutputComponent::Header),
-            "numbers" => Ok(OutputComponent::Numbers),
-            "full" => Ok(OutputComponent::Full),
-            "plain" => Ok(OutputComponent::Plain),
-            _ => Err(ErrorKind::UnknownStyleName(s.to_owned()).into()),
-        }
-    }
-}
-
-pub struct OutputComponents(HashSet<OutputComponent>);
-
-impl OutputComponents {
-    fn changes(&self) -> bool {
-        self.0.contains(&OutputComponent::Changes)
-    }
-
-    fn grid(&self) -> bool {
-        self.0.contains(&OutputComponent::Grid)
-    }
-
-    fn header(&self) -> bool {
-        self.0.contains(&OutputComponent::Header)
-    }
-
-    fn numbers(&self) -> bool {
-        self.0.contains(&OutputComponent::Numbers)
-    }
-}
-
-pub struct Options<'a> {
-    pub true_color: bool,
-    pub output_components: OutputComponents,
-    pub language: Option<&'a str>,
-    pub colored_output: bool,
-    pub paging: bool,
-    pub term_width: usize,
-}
-
 enum OutputType {
     Pager(Child),
     Stdout(io::Stdout),
diff --git a/src/style.rs b/src/style.rs
new file mode 100644
index 00000000..ce55c7d7
--- /dev/null
+++ b/src/style.rs
@@ -0,0 +1,73 @@
+use errors::*;
+use std::collections::HashSet;
+use std::str::FromStr;
+
+#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
+pub enum OutputComponent {
+    Auto,
+    Changes,
+    Grid,
+    Header,
+    Numbers,
+    Full,
+    Plain,
+}
+
+impl OutputComponent {
+    pub fn components(&self, interactive_terminal: bool) -> &'static [OutputComponent] {
+        match *self {
+            OutputComponent::Auto => if interactive_terminal {
+                OutputComponent::Full.components(interactive_terminal)
+            } else {
+                OutputComponent::Plain.components(interactive_terminal)
+            },
+            OutputComponent::Changes => &[OutputComponent::Changes],
+            OutputComponent::Grid => &[OutputComponent::Grid],
+            OutputComponent::Header => &[OutputComponent::Header],
+            OutputComponent::Numbers => &[OutputComponent::Numbers],
+            OutputComponent::Full => &[
+                OutputComponent::Changes,
+                OutputComponent::Grid,
+                OutputComponent::Header,
+                OutputComponent::Numbers,
+            ],
+            OutputComponent::Plain => &[],
+        }
+    }
+}
+
+impl FromStr for OutputComponent {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self> {
+        match s {
+            "auto" => Ok(OutputComponent::Auto),
+            "changes" => Ok(OutputComponent::Changes),
+            "grid" => Ok(OutputComponent::Grid),
+            "header" => Ok(OutputComponent::Header),
+            "numbers" => Ok(OutputComponent::Numbers),
+            "full" => Ok(OutputComponent::Full),
+            "plain" | _ => Ok(OutputComponent::Plain),
+        }
+    }
+}
+
+pub struct OutputComponents(pub HashSet<OutputComponent>);
+
+impl OutputComponents {
+    pub fn changes(&self) -> bool {
+        self.0.contains(&OutputComponent::Changes)
+    }
+
+    pub fn grid(&self) -> bool {
+        self.0.contains(&OutputComponent::Grid)
+    }
+
+    pub fn header(&self) -> bool {
+        self.0.contains(&OutputComponent::Header)
+    }
+
+    pub fn numbers(&self) -> bool {
+        self.0.contains(&OutputComponent::Numbers)
+    }
+}