diff --git a/config/default.toml b/config/default.toml
index 1f29b0b..2a585b7 100644
--- a/config/default.toml
+++ b/config/default.toml
@@ -1,7 +1,10 @@
 [colortheme]
-background = [26, 26, 28]
-command_bar = [20, 28, 20]
+background = [0x26, 0x26, 0x28]
+command-bar = [0x20, 0x28, 0x20]
+cmdbar-prompt = [0x40, 0x40, 0x40]
+cmdbar-cmdexist = [0x40, 0xff, 0x40]
+cmdbar-cmdunexist = [0xff, 0x40, 0x40]
 
 [command]
-new_window = "n"
+new-window = "n"
 quit = "q"
diff --git a/src/application.rs b/src/application.rs
index c4c1b6c..68a7f71 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -15,7 +15,9 @@ use crossterm::{
 
 use unicode_width::UnicodeWidthStr;
 
-use crate::{colortheme::ColorTheme, iterate_config, window::Window, Config};
+use crate::{
+    colortheme::ColorTheme, command::CommandProcessor, iterate_config, window::Window, Config,
+};
 
 pub struct Application {
     config: Config,
@@ -23,10 +25,7 @@ pub struct Application {
     stdout: Stdout,
     size: (u16, u16),
     windows: HashMap<usize, Window>,
-    command_mode: bool,
-    command: String,
-    cmdbar_show: String,
-    cmdbar_prompt: String,
+    cmdprocessor: CommandProcessor,
 }
 
 impl Application {
@@ -46,142 +45,84 @@ impl Application {
             stdout: stdout(),
             size: terminal::size()?,
             windows: HashMap::new(),
-            command_mode: true,
-            command: String::new(),
-            cmdbar_show: String::new(),
-	    cmdbar_prompt: String::from("New workspace"),
+            cmdprocessor: CommandProcessor::new(),
         })
     }
 
     pub fn exec(&mut self) -> io::Result<()> {
         self.render()?;
-        self.stdout.flush()?;
         loop {
             if event::poll(Duration::from_secs(5))? {
                 match event::read()? {
                     event::Event::FocusGained => queue!(self.stdout, cursor::Show)?,
                     event::Event::FocusLost => queue!(self.stdout, cursor::Hide)?,
                     event::Event::Key(key_event) => {
-                        let KeyEvent {
-                            code, modifiers, ..
-                        } = key_event;
-                        match code {
-                            event::KeyCode::Backspace => {
-                                if self.command_mode {
-                                    self.command.pop();
-                                    self.cmdbar_show.clone_from(&self.command);
-                                }
-                            }
-                            event::KeyCode::Enter => {
-				if self.command_mode {
-				    self.command.clear();
-				    self.cmdbar_show.clear();
-				}
-			    }
-                            event::KeyCode::Left => (),
-                            event::KeyCode::Right => (),
-                            event::KeyCode::Up => (),
-                            event::KeyCode::Down => (),
-                            event::KeyCode::Home => (),
-                            event::KeyCode::End => (),
-                            event::KeyCode::PageUp => (),
-                            event::KeyCode::PageDown => (),
-                            event::KeyCode::Tab => (),
-                            event::KeyCode::BackTab => (),
-                            event::KeyCode::Delete => (),
-                            event::KeyCode::Insert => (),
-                            event::KeyCode::F(_) => (),
-                            event::KeyCode::Char(c) => {
-                                if self.command_mode {
-                                    let mut b = true;
-                                    if modifiers.contains(KeyModifiers::CONTROL) {
-                                        self.command += "C-";
-                                    } else if modifiers.contains(KeyModifiers::ALT) {
-                                        self.command += "A-";
-                                    } else {
-                                        b = false;
-                                    }
-                                    self.command.push(c);
-                                    if b {
-                                        self.command.push(' ');
-                                    }
-                                    self.cmdbar_show.clone_from(&self.command);
-                                }
-                            }
-                            event::KeyCode::Null => (),
-                            event::KeyCode::Esc => (),
-                            event::KeyCode::CapsLock => (),
-                            event::KeyCode::ScrollLock => (),
-                            event::KeyCode::NumLock => (),
-                            event::KeyCode::PrintScreen => (),
-                            event::KeyCode::Pause => (),
-                            event::KeyCode::Menu => (),
-                            event::KeyCode::KeypadBegin => (),
-                            event::KeyCode::Media(media) => (),
-                            event::KeyCode::Modifier(modifier) => (),
+                        if self.cmdprocessor.is_command_mode() {
+                            self.cmdprocessor.key_event(key_event);
                         }
                     }
                     event::Event::Mouse(mouse_event) => (),
                     event::Event::Paste(_) => (),
                     event::Event::Resize(w, h) => self.size = (w, h),
                 }
-                self.render()?;
-                let f = |_, value| {
-                    if let &toml::Value::String(ref s) = value {
-                        s == &self.command
-                    } else {
-                        false
-                    }
-                };
-                if let toml::Value::Table(map) = &self.config.get("command").unwrap() {
-                    if let Some((name, _)) = iterate_config(map, &f) {
-                        match name.as_str() {
-                            "quit" => break,
-                            _ => self.cmdbar_prompt = String::from("Unknown command"),
-                        }
-                        self.command.clear();
-                    }
+                if self.command_process() {
+                    break;
                 }
-                self.stdout.flush()?;
+                self.render()?;
             } else {
             }
         }
         self.render()?;
-        self.stdout.flush()?;
         thread::sleep(Duration::from_millis(200));
         Ok(())
     }
 
+    fn command_process(&mut self) -> bool {
+        if let toml::Value::Table(map) = &self.config.get("command").unwrap() {
+            if self.cmdprocessor.process(map) {
+                true
+            } else {
+                false
+            }
+        } else {
+            false
+        }
+    }
+
     fn render(&mut self) -> io::Result<()> {
         let mut show = String::new();
-        for c in self.cmdbar_show.chars() {
+        for c in self.cmdprocessor.get_show().chars() {
             show.push(c);
             if UnicodeWidthStr::width(show.as_str()) as u16 >= self.size.0 - 1 {
                 break;
             }
         }
-	let x = cursor::position().unwrap().0;
-	let mut prompt = String::new();
-	for c in self.cmdbar_prompt.chars() {
-	    show.push(c);
-	    if UnicodeWidthStr::width(prompt.as_str()) as u16 >= self.size.0 - 1 - x {
-		break;
-	    }
-	}
+        let x = UnicodeWidthStr::width(show.as_str()) as u16;
+        let mut prompt = String::new();
+        for c in self.cmdprocessor.get_prompt().chars() {
+            prompt.push(c);
+            if UnicodeWidthStr::width(prompt.as_str()) as u16 >= self.size.0 - 1 - x {
+                break;
+            }
+        }
+        let x = x + UnicodeWidthStr::width(prompt.as_str()) as u16;
         queue!(
             self.stdout,
             style::SetBackgroundColor(self.colortheme.command_bar),
             cursor::MoveTo(0, self.size.1 - 1),
+            style::SetForegroundColor(if self.cmdprocessor.unknown() {
+                self.colortheme.cmdbar_cmdunexist
+            } else {
+                self.colortheme.cmdbar_cmdexist
+            }),
             style::Print(show),
-	    style::SetForegroudColor(self.colortheme.cmdbar_prompt),
-	    style::Print(prompt),
-        )?;
-        let x = cursor::position().unwrap().0;
-        queue!(
-            self.stdout,
+            cursor::SavePosition,
+            style::SetForegroundColor(self.colortheme.cmdbar_prompt),
+            style::Print(prompt),
             style::Print(" ".repeat((self.size.0 - x) as usize)),
-            cursor::MoveTo(x, self.size.1 - 1),
+            cursor::RestorePosition,
         )?;
+        self.stdout.flush()?;
         Ok(())
     }
 }
diff --git a/src/colortheme.rs b/src/colortheme.rs
index 649953d..c12570d 100644
--- a/src/colortheme.rs
+++ b/src/colortheme.rs
@@ -4,6 +4,9 @@ use toml::{Table, Value};
 pub struct ColorTheme {
     pub background: Color,
     pub command_bar: Color,
+    pub cmdbar_prompt: Color,
+    pub cmdbar_cmdexist: Color,
+    pub cmdbar_cmdunexist: Color,
 }
 
 impl From<&Table> for ColorTheme {
@@ -20,10 +23,16 @@ impl From<&Table> for ColorTheme {
             }
         };
         let background = f("background");
-        let command_bar = f("command_bar");
+        let command_bar = f("command-bar");
+        let cmdbar_prompt = f("cmdbar-prompt");
+        let cmdbar_cmdexist = f("cmdbar-cmdexist");
+        let cmdbar_cmdunexist = f("cmdbar-cmdunexist");
         Self {
             background,
             command_bar,
+            cmdbar_prompt,
+            cmdbar_cmdexist,
+            cmdbar_cmdunexist,
         }
     }
 }
diff --git a/src/command.rs b/src/command.rs
new file mode 100644
index 0000000..9ba3a02
--- /dev/null
+++ b/src/command.rs
@@ -0,0 +1,125 @@
+use crossterm::event::{self, KeyEvent, KeyModifiers};
+
+use crate::{iterate_config, Config};
+
+pub struct CommandProcessor {
+    command_mode: bool,
+    command: String,
+    unknown_cmd: bool,
+    cmdbar_show: String,
+    cmdbar_prompt: String,
+}
+
+impl CommandProcessor {
+    pub fn new() -> Self {
+        Self {
+            command_mode: true,
+            command: String::new(),
+            unknown_cmd: false,
+            cmdbar_show: String::new(),
+            cmdbar_prompt: String::from("New workspace"),
+        }
+    }
+
+    pub fn get_show(&self) -> &String {
+        &self.cmdbar_show
+    }
+
+    pub fn get_prompt(&self) -> &String {
+        &self.cmdbar_prompt
+    }
+
+    pub fn unknown(&self) -> bool {
+        self.unknown_cmd
+    }
+
+    pub fn is_command_mode(&self) -> bool {
+        self.command_mode
+    }
+
+    pub fn process(&mut self, map: &Config) -> bool {
+        let f = |_, value| {
+            if let &toml::Value::String(ref s) = value {
+                s == &self.command
+            } else {
+                false
+            }
+        };
+        if let Some((name, _)) = iterate_config(map, &f) {
+            self.command.clear();
+            self.cmdbar_prompt = format!(" - {}", name);
+            self.unknown_cmd = false;
+            match name.as_str() {
+                "quit" => return true,
+                _ => (),
+            }
+        } else if !self.cmdbar_show.is_empty() {
+            self.cmdbar_prompt = String::from(" | Unknown command");
+            self.unknown_cmd = true;
+        } else {
+            self.cmdbar_prompt.clear();
+        }
+        false
+    }
+
+    pub fn key_event(&mut self, key: KeyEvent) {
+        let KeyEvent {
+            code, modifiers, ..
+        } = key;
+        match code {
+            event::KeyCode::Backspace => {
+                if self.command_mode {
+                    self.command.pop();
+                    self.cmdbar_show.clone_from(&self.command);
+                }
+            }
+            event::KeyCode::Enter => {
+                if self.command_mode {
+                    self.command.clear();
+                    self.cmdbar_show.clear();
+                }
+            }
+            event::KeyCode::Left => (),
+            event::KeyCode::Right => (),
+            event::KeyCode::Up => (),
+            event::KeyCode::Down => (),
+            event::KeyCode::Home => (),
+            event::KeyCode::End => (),
+            event::KeyCode::PageUp => (),
+            event::KeyCode::PageDown => (),
+            event::KeyCode::Tab => (),
+            event::KeyCode::BackTab => (),
+            event::KeyCode::Delete => (),
+            event::KeyCode::Insert => (),
+            event::KeyCode::F(_) => (),
+            event::KeyCode::Char(c) => {
+                if self.command_mode {
+                    let mut b = true;
+                    if modifiers.contains(KeyModifiers::CONTROL) {
+                        self.command += "C-";
+                    } else if modifiers.contains(KeyModifiers::ALT) {
+                        self.command += "A-";
+                    } else {
+                        b = false;
+                    }
+                    self.command.push(c);
+                    if b {
+                        self.command.push(' ');
+                    }
+                    self.cmdbar_show.clone_from(&self.command);
+                }
+            }
+            event::KeyCode::Null => (),
+            event::KeyCode::Esc => (),
+            event::KeyCode::CapsLock => (),
+            event::KeyCode::ScrollLock => (),
+            event::KeyCode::NumLock => (),
+            event::KeyCode::PrintScreen => (),
+            event::KeyCode::Pause => (),
+            event::KeyCode::Menu => (),
+            event::KeyCode::KeypadBegin => (),
+            event::KeyCode::Media(media) => (),
+            event::KeyCode::Modifier(modifier) => (),
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 44ecab1..3413406 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 pub mod application;
 pub mod colortheme;
 pub mod window;
+pub mod command;
 
 use std::io;