Error handling (#69)

* Implemented an error module for crossterm and fixed a lot of warnings.

examples/color/mod.rs

@@ -18,7 +18,7 @@ pub fn paint_foreground() {
     // Or print inline
     println!(
         "Colored text: {}",
-        style("Red foreground").with(Color::Blue)
+        style("Blue foreground").with(Color::Blue)
     );
 }
 

examples/examples.rs

@@ -15,14 +15,11 @@ mod input;
 mod terminal;
 
 fn main() {
-    use input::keyboard::input;
+    let cursor = crossterm::cursor();
+    cursor.goto(5,5);
 
-    //    color::print_all_foreground_colors();
+    let integer = 10;
-    //    color::print_all_background_colors();
+    let float: f32 = integert as f32;
 
-    use terminal::alternate_screen;
+    println!("5.515151");
-    //    color::print_all_background_colors();
-    //    color::print_all_foreground_colors();
-
-    alternate_screen::print_wait_screen_on_alternate_window();
 }

src/common/commands/win_commands.rs

@@ -78,7 +78,7 @@ impl RawModeCommand {
     pub fn enable(&mut self) -> Result<()> {
         let console_mode = ConsoleMode::new()?;
 
-        let mut dw_mode = console_mode.mode()?;
+        let dw_mode = console_mode.mode()?;
 
         let new_mode = dw_mode & !self.mask;
 
@@ -91,7 +91,7 @@ impl RawModeCommand {
     pub fn disable(&self) -> Result<()> {
         let console_mode = ConsoleMode::new()?;
 
-        let mut dw_mode = console_mode.mode()?;
+        let dw_mode = console_mode.mode()?;
 
         let new_mode = dw_mode | self.mask;
 
@@ -114,7 +114,7 @@ impl ToAlternateScreenCommand {
 impl IAlternateScreenCommand for ToAlternateScreenCommand {
     fn enable(&self, _stdout: &mut TerminalOutput) -> Result<()> {
         let alternate_screen = ScreenBuffer::create();
-        alternate_screen.show();
+        alternate_screen.show()?;
         Ok(())
     }
 

src/common/error.rs

@@ -0,0 +1,51 @@
+//! Module containing error handling logic.
+
+use std::{
+    fmt::{self, Display, Formatter},
+    io,
+};
+
+/// The `crossterm` result type.
+pub type Result<T> = std::result::Result<T, ErrorKind>;
+
+/// Wrapper for all errors who could occur in `crossterm`.
+#[derive(Debug)]
+pub enum ErrorKind {
+    IoError(io::Error),
+    FmtError(fmt::Error),
+    ResizingTerminalFailure(String),
+
+    #[doc(hidden)]
+    __Nonexhaustive,
+}
+
+impl std::error::Error for ErrorKind {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match *self {
+            ErrorKind::IoError(ref e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+impl Display for ErrorKind {
+    fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
+        match *self {
+            ErrorKind::IoError(_) => write!(fmt, "IO-error occurred"),
+            ErrorKind::ResizingTerminalFailure(_) => write!(fmt, "Cannot resize the terminal"),
+            _ => write!(fmt, "Some error has occurred"),
+        }
+    }
+}
+
+impl From<io::Error> for ErrorKind {
+    fn from(e: io::Error) -> ErrorKind {
+        ErrorKind::IoError(e)
+    }
+}
+
+impl From<fmt::Error> for ErrorKind {
+    fn from(e: fmt::Error) -> ErrorKind {
+        ErrorKind::FmtError(e)
+    }
+}

src/common/functions.rs

@@ -64,18 +64,18 @@ pub fn exit_terminal() {
 /// If the current platform is unix it will return the ansi implementation.
 pub fn get_module<T>(winapi_impl: T, unix_impl: T) -> Option<T> {
     let mut term: Option<T> = None;
-    let does_support = false;
+    let mut does_support = false;
 
-    //    if !windows_supportable() {
+    if !windows_supportable() {
-    // Try to enable ansi on windows if not than use WINAPI.
+//     Try to enable ansi on windows if not than use WINAPI.
-    //        does_support = try_enable_ansi_support();
+        does_support = try_enable_ansi_support();
-
+//
-    // uncomment this line when you want to use the winapi implementation.
+//     uncomment this line when you want to use the winapi implementation.
-    //                    does_support = false;
+//        does_support = false;
-    if !does_support {
+        if !does_support {
-        term = Some(winapi_impl);
+            term = Some(winapi_impl);
+        }
     }
-    //    }
 
     if does_support {
         term = Some(unix_impl);

src/common/mod.rs

@@ -6,8 +6,9 @@ pub mod commands;
 pub mod functions;
 pub mod screen;
 pub mod traits;
+pub mod error;
 
 mod crossterm;
 
 pub use self::crossterm::Crossterm;
-use TerminalOutput;
+use TerminalOutput;

src/common/screen/alternate.rs

@@ -44,8 +44,7 @@ impl AlternateScreen {
             functions::get_module::<Box<commands::IAlternateScreenCommand + Sync + Send>>(
                 Box::from(commands::win_commands::ToAlternateScreenCommand::new()),
                 Box::from(commands::shared_commands::ToAlternateScreenCommand::new()),
-            )
+            ).unwrap();
-            .unwrap();
 
         #[cfg(not(target_os = "windows"))]
         let command = Box::from(commands::shared_commands::ToAlternateScreenCommand::new());
@@ -72,6 +71,6 @@ impl AlternateScreen {
 impl Drop for AlternateScreen {
     /// This will switch back to main screen on drop.
     fn drop(&mut self) {
-        self.to_main_screen();
+        self.to_main_screen().unwrap();
     }
 }

src/common/screen/screen.rs

@@ -165,7 +165,7 @@ impl Drop for Screen {
     /// If the current screen is in raw mode we need to disable it when the instance goes out of scope.
     fn drop(&mut self) {
         if self.stdout.is_in_raw_mode && self.drop {
-            RawScreen::disable_raw_modes();
+            RawScreen::disable_raw_modes().unwrap();
         }
     }
 }

src/kernel/windows_kernel/ansi_support.rs

@@ -5,10 +5,11 @@ use std::sync::{Once, ONCE_INIT};
 static mut HAS_BEEN_TRIED_TO_ENABLE: bool = false;
 static mut IS_ANSI_ON_WINDOWS_ENABLED: Option<bool> = None;
 static mut DOES_WINDOWS_SUPPORT_ANSI: Option<bool> = None;
-static ENABLE_ANSI: Once = ONCE_INIT;
 use common::commands::win_commands::EnableAnsiCommand;
 use common::commands::IEnableAnsiCommand;
 
+static ENABLE_ANSI: Once = ONCE_INIT;
+
 /// Try enable `ANSI escape codes` and return the result.
 pub fn try_enable_ansi_support() -> bool {
     ENABLE_ANSI.call_once(|| {

src/kernel/windows_kernel/mod.rs

@@ -1,15 +1,11 @@
 //! This module contains the `windows` (unsafe) logic.
 
+#[allow(unused)]
+mod reading;
 pub mod ansi_support;
 mod cursor;
-pub mod reading;
 pub mod writing;
 
-use winapi::um::{
-    wincon::{CONSOLE_SCREEN_BUFFER_INFO, COORD, SMALL_RECT},
-    winnt::HANDLE,
-};
-
 pub use self::cursor::Cursor;
 pub use crossterm_winapi::{
     Console, ConsoleMode, Coord, Handle, HandleType, ScreenBuffer, ScreenBufferInfo, Size,
@@ -19,4 +15,4 @@ pub use crossterm_winapi::{
 /// Exit the current process.
 pub fn exit() {
     ::std::process::exit(256);
-}
+}

src/kernel/windows_kernel/reading.rs

@@ -1,4 +1,4 @@
-use crossterm_winapi::{Handle, HandleType};
+use crossterm_winapi::Handle;
 
 use std::{
     io::{self, Write},
@@ -50,7 +50,7 @@ pub fn read_line(buf: &mut Vec<u8>) -> io::Result<usize> {
         .filter(|&x| x != 10 || x != 13)
         .collect::<Vec<u8>>();
 
-    buf.write(a);
+    buf.write(a)?;
     Ok(num as usize)
 }
 

src/kernel/windows_kernel/writing.rs

@@ -12,6 +12,7 @@ use std::io::{self, Result};
 use std::str;
 
 /// Write console output.
+#[allow(unused)]
 pub fn write_console_output(
     write_buffer: &HANDLE,
     copy_buffer: &mut [CHAR_INFO; 160],

src/modules/cursor/ansi_cursor.rs

@@ -3,6 +3,7 @@
 //! Note that the cursor position is 0 based. This means that we start counting at 0 when setting the cursor position etc.
 
 use super::*;
+use common::error::Result;
 
 /// This struct is an ANSI implementation for cursor related actions.
 pub struct AnsiCursor {}
@@ -14,51 +15,61 @@ impl AnsiCursor {
 }
 
 impl ITerminalCursor for AnsiCursor {
-    fn goto(&self, x: u16, y: u16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn goto(&self, x: u16, y: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(stdout, format!(csi!("{};{}H"), y + 1, x + 1));
+        functions::write(stdout, format!(csi!("{};{}H"), y + 1, x + 1))?;
+        Ok(())
     }
 
     fn pos(&self) -> (u16, u16) {
         functions::get_cursor_position()
     }
 
-    fn move_up(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_up(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(stdout, format!(csi!("{}A"), count));
+        functions::write(stdout, format!(csi!("{}A"), count))?;
+        Ok(())
     }
 
-    fn move_right(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_right(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(stdout, format!(csi!("{}C"), count));
+        functions::write(stdout, format!(csi!("{}C"), count))?;
+        Ok(())
     }
 
-    fn move_down(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_down(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(stdout, format!(csi!("{}B"), count));
+        functions::write(stdout, format!(csi!("{}B"), count))?;
+        Ok(())
     }
 
-    fn move_left(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_left(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(stdout, format!(csi!("{}D"), count));
+        functions::write(stdout, format!(csi!("{}D"), count))?;
+        Ok(())
     }
 
-    fn save_position(&self, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn save_position(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write_str(stdout, csi!("s"));
+        functions::write_str(stdout, csi!("s"))?;
+        Ok(())
     }
 
-    fn reset_position(&self, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn reset_position(&self, stdout: &Option<&Arc<TerminalOutput>>)-> Result<()> {
-        functions::write_str(stdout, csi!("u"));
+        functions::write_str(stdout, csi!("u"))?;
+        Ok(())
     }
 
-    fn hide(&self, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn hide(&self, stdout: &Option<&Arc<TerminalOutput>>)-> Result<()> {
-        functions::write_str(stdout, csi!("?25l"));
+        functions::write_str(stdout, csi!("?25l"))?;
+        Ok(())
     }
 
-    fn show(&self, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn show(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>{
-        functions::write_str(stdout, csi!("?25h"));
+        functions::write_str(stdout, csi!("?25h"))?;
+        Ok(())
     }
 
-    fn blink(&self, blink: bool, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn blink(&self, blink: bool, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>{
         if blink {
-            functions::write_str(stdout, csi!("?12h"));
+            functions::write_str(stdout, csi!("?12h"))?;
         } else {
-            functions::write_str(stdout, csi!("?12l"));
+            functions::write_str(stdout, csi!("?12l"))?;
         }
+        Ok(())
     }
 }

src/modules/cursor/cursor.rs

@@ -4,6 +4,7 @@
 //! Note that positions of the cursor are 0 -based witch means that the coordinates (cells) starts counting from 0
 
 use super::*;
+use common::error::Result;
 use Screen;
 
 /// Struct that stores a platform-specific implementation for cursor related actions.
@@ -94,8 +95,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.goto(4,5);
     ///
     /// ```
-    pub fn goto(&self, x: u16, y: u16) {
+    pub fn goto(&self, x: u16, y: u16) -> Result<()> {
-        self.terminal_cursor.goto(x, y, &self.stdout);
+        self.terminal_cursor.goto(x, y, &self.stdout)
     }
 
     /// Get current cursor position (x,y) in the terminal.
@@ -119,7 +120,7 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.move_up(3);
     /// ```
     pub fn move_up(&mut self, count: u16) -> &mut TerminalCursor<'stdout> {
-        self.terminal_cursor.move_up(count, &self.stdout);
+        self.terminal_cursor.move_up(count, &self.stdout).unwrap();
         self
     }
 
@@ -132,7 +133,7 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.move_right(3);
     /// ```
     pub fn move_right(&mut self, count: u16) -> &mut TerminalCursor<'stdout> {
-        self.terminal_cursor.move_right(count, &self.stdout);
+        self.terminal_cursor.move_right(count, &self.stdout).unwrap();
         self
     }
 
@@ -145,7 +146,7 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.move_down(3);
     /// ```
     pub fn move_down(&mut self, count: u16) -> &mut TerminalCursor<'stdout> {
-        self.terminal_cursor.move_down(count, &self.stdout);
+        self.terminal_cursor.move_down(count, &self.stdout).unwrap();
         self
     }
 
@@ -158,7 +159,7 @@ impl<'stdout> TerminalCursor<'stdout> {
     ///  cursor.move_left(3);
     /// ```
     pub fn move_left(&mut self, count: u16) -> &mut TerminalCursor<'stdout> {
-        self.terminal_cursor.move_left(count, &self.stdout);
+        self.terminal_cursor.move_left(count, &self.stdout).unwrap();
         self
     }
 
@@ -171,8 +172,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     ///
     /// cursor.safe_position();
     /// ```
-    pub fn save_position(&self) {
+    pub fn save_position(&self) -> Result<()> {
-        self.terminal_cursor.save_position(&self.stdout);
+        self.terminal_cursor.save_position(&self.stdout)
     }
 
     /// Return to saved cursor position
@@ -184,8 +185,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     ///
     /// cursor.reset_position();
     /// ```
-    pub fn reset_position(&self) {
+    pub fn reset_position(&self) -> Result<()> {
-        self.terminal_cursor.reset_position(&self.stdout);
+        self.terminal_cursor.reset_position(&self.stdout)
     }
 
     /// Hide de cursor in the console.
@@ -194,8 +195,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// let cursor = cursor();
     /// cursor.hide();
     /// ```
-    pub fn hide(&self) {
+    pub fn hide(&self) -> Result<()> {
-        self.terminal_cursor.hide(&self.stdout);
+        self.terminal_cursor.hide(&self.stdout)
     }
 
     /// Show the cursor in the console.
@@ -206,8 +207,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.show();
     ///
     /// ```
-    pub fn show(&self) {
+    pub fn show(&self) -> Result<()> {
-        self.terminal_cursor.show(&self.stdout);
+        self.terminal_cursor.show(&self.stdout)
     }
 
     /// Enable or disable blinking of the terminal.
@@ -219,8 +220,8 @@ impl<'stdout> TerminalCursor<'stdout> {
     /// cursor.blink(true);
     /// cursor.blink(false);
     /// ```
-    pub fn blink(&self, blink: bool) {
+    pub fn blink(&self, blink: bool) -> Result<()> {
-        self.terminal_cursor.blink(blink, &self.stdout);
+        self.terminal_cursor.blink(blink, &self.stdout)
     }
 }
 

src/modules/cursor/mod.rs

@@ -17,7 +17,7 @@ use self::ansi_cursor::AnsiCursor;
 use self::winapi_cursor::WinApiCursor;
 
 pub use self::cursor::{cursor, from_screen, TerminalCursor};
-
+use common::error::Result;
 use super::functions;
 use std::sync::Arc;
 use TerminalOutput;
@@ -32,25 +32,25 @@ use TerminalOutput;
 ///! so that cursor related actions can be performed on both UNIX and Windows systems.
 trait ITerminalCursor: Sync + Send {
     /// Goto some location (x,y) in the context.
-    fn goto(&self, x: u16, y: u16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn goto(&self, x: u16, y: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Get the location (x,y) of the current cursor in the context
     fn pos(&self) -> (u16, u16);
     /// Move cursor n times up
-    fn move_up(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn move_up(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Move the cursor `n` times to the right.
-    fn move_right(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn move_right(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Move the cursor `n` times down.
-    fn move_down(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn move_down(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Move the cursor `n` times left.
-    fn move_left(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn move_left(&self, count: u16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Save cursor position so that its saved position can be recalled later. Note that this position is stored program based not per instance of the cursor struct.
-    fn save_position(&self, stdout: &Option<&Arc<TerminalOutput>>);
+    fn save_position(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Return to saved cursor position
-    fn reset_position(&self, stdout: &Option<&Arc<TerminalOutput>>);
+    fn reset_position(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Hide the terminal cursor.
-    fn hide(&self, stdout: &Option<&Arc<TerminalOutput>>);
+    fn hide(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Show the terminal cursor
-    fn show(&self, stdout: &Option<&Arc<TerminalOutput>>);
+    fn show(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Enable or disable the blinking of the cursor.
-    fn blink(&self, blink: bool, stdout: &Option<&Arc<TerminalOutput>>);
+    fn blink(&self, blink: bool, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
 }

src/modules/cursor/winapi_cursor.rs

@@ -2,8 +2,8 @@
 //! This module is used for Windows terminals that do not support ANSI escape codes.
 //! Note that the cursor position is 0 based. This means that we start counting at 0 when setting the cursor position.
 
-use kernel::windows_kernel::Cursor;
+use kernel::windows_kernel::{Cursor, Handle};
-
+use common::error::Result;
 use super::*;
 
 /// This struct is a windows implementation for cursor related actions.
@@ -16,9 +16,10 @@ impl WinApiCursor {
 }
 
 impl ITerminalCursor for WinApiCursor {
-    fn goto(&self, x: u16, y: u16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn goto(&self, x: u16, y: u16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        let cursor = Cursor::new().unwrap();
+        let cursor = Cursor::new()?;
-        cursor.goto(x as i16, y as i16);
+        cursor.goto(x as i16, y as i16)?;
+        Ok(())
     }
 
     fn pos(&self) -> (u16, u16) {
@@ -26,41 +27,49 @@ impl ITerminalCursor for WinApiCursor {
         cursor.position().unwrap().into()
     }
 
-    fn move_up(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_up(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         let (xpos, ypos) = self.pos();
-        self.goto(xpos, ypos - count, _stdout);
+        self.goto(xpos, ypos - count, _stdout)?;
+        Ok(())
     }
 
-    fn move_right(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_right(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         let (xpos, ypos) = self.pos();
-        self.goto(xpos + count, ypos, _stdout);
+        self.goto(xpos + count, ypos, _stdout)?;
+        Ok(())
     }
 
-    fn move_down(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_down(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         let (xpos, ypos) = self.pos();
-        self.goto(xpos, ypos + count, _stdout);
+        self.goto(xpos, ypos + count, _stdout)?;
+        Ok(())
     }
 
-    fn move_left(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn move_left(&self, count: u16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         let (xpos, ypos) = self.pos();
-        self.goto(xpos - count, ypos, _stdout);
+        self.goto(xpos - count, ypos, _stdout)?;
+        Ok(())
     }
 
-    fn save_position(&self, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn save_position(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        Cursor::save_cursor_pos();
+        Cursor::save_cursor_pos()?;
+        Ok(())
     }
 
-    fn reset_position(&self, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn reset_position(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        Cursor::reset_to_saved_position();
+        Cursor::reset_to_saved_position()?;
+        Ok(())
     }
 
-    fn hide(&self, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn hide(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        Cursor::new().unwrap().set_visibility(false);
+        Cursor::from(Handle::current_out_handle()?).set_visibility(false)?;
+        Ok(())
     }
 
-    fn show(&self, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn show(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        Cursor::new().unwrap().set_visibility(true);
+        Cursor::from(Handle::current_out_handle()?).set_visibility(true)?;
+        Ok(())
     }
 
-    fn blink(&self, _blink: bool, _stdout: &Option<&Arc<TerminalOutput>>) {}
+    fn blink(&self, _blink: bool, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> { Ok(()) }
 }

src/modules/input/windows_input.rs

@@ -73,7 +73,9 @@ impl ITerminalInput for WindowsInput {
                     return;
                 }
 
-                tx.send(Ok(pressed_char as u8));
+                if let Err(_) = tx.send(Ok(pressed_char as u8)) {
+                    println!("Could not send pressed char to receiver.")
+                }
             }
         });
 
@@ -110,7 +112,9 @@ impl ITerminalInput for WindowsInput {
                     return;
                 }
 
-                tx.send(Ok(pressed_char as u8));
+                if let Err(_) = tx.send(Ok(pressed_char as u8)) {
+                    println!("Could not send pressed char to receiver.")
+                }
             }
         });
 
@@ -118,14 +122,6 @@ impl ITerminalInput for WindowsInput {
     }
 }
 
-fn is_line_end(key: char) -> bool {
-    if key as u8 == 13 {
-        return true;
-    }
-
-    return false;
-}
-
 extern "C" {
     fn _getwche() -> INT;
     fn _getwch() -> INT;

src/modules/output/winapi_output.rs

@@ -18,7 +18,7 @@ impl IStdout for WinApiOutput {
     }
 
     fn write(&self, buf: &[u8]) -> io::Result<usize> {
-        let handle = Handle::current_out_handle().unwrap();
+        let handle = Handle::current_out_handle()?;
         writing::write_char_buffer(&handle, buf)
     }
 

src/modules/style/ansi_color.rs

@@ -2,6 +2,7 @@
 //! This module is used for Windows 10 terminals and Unix terminals by default.
 
 use super::*;
+use common::error::Result;
 
 /// This struct is an ANSI escape code implementation for color related actions.
 pub struct AnsiColor;
@@ -13,28 +14,31 @@ impl AnsiColor {
 }
 
 impl ITerminalColor for AnsiColor {
-    fn set_fg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_fg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         functions::write(
             stdout,
             format!(
                 csi!("{}m"),
                 self.color_value(fg_color, ColorType::Foreground)
             ),
-        );
+        )?;
+        Ok(())
     }
 
-    fn set_bg(&self, bg_color: Color, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_bg(&self, bg_color: Color, stdout: &Option<&Arc<TerminalOutput>>)-> Result<()> {
         functions::write(
             stdout,
             format!(
                 csi!("{}m"),
                 self.color_value(bg_color, ColorType::Background)
             ),
-        );
+        )?;
+        Ok(())
     }
 
-    fn reset(&self, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn reset(&self, stdout: &Option<&Arc<TerminalOutput>>)-> Result<()>{
-        functions::write_str(stdout, csi!("0m"));
+        functions::write_str(stdout, csi!("0m"))?;
+        Ok(())
     }
 
     fn color_value(&self, color: Color, color_type: ColorType) -> String {
@@ -77,4 +81,4 @@ impl ITerminalColor for AnsiColor {
         ansi_value.push_str(color_val);
         ansi_value
     }
-}
+}

src/modules/style/color.rs

@@ -94,8 +94,8 @@ impl<'stdout> TerminalColor<'stdout> {
     /// // crossterm provides to set the background from &str or String
     /// colored_terminal.set_fg(Color::from("Red"));
     /// ```
-    pub fn set_fg(&self, color: Color) {
+    pub fn set_fg(&self, color: Color)-> Result<()> {
-        self.color.set_fg(color, &self.stdout);
+        self.color.set_fg(color, &self.stdout)
     }
 
     /// Set the background color to the given color.
@@ -108,8 +108,8 @@ impl<'stdout> TerminalColor<'stdout> {
     /// // crossterm provides to set the background from &str or String
     /// colored_terminal.set_bg(Color::from("Red"));
     /// ```
-    pub fn set_bg(&self, color: Color) {
+    pub fn set_bg(&self, color: Color) -> Result<()>{
-        self.color.set_bg(color, &self.stdout);
+        self.color.set_bg(color, &self.stdout)
     }
 
     /// Reset the terminal colors and attributes to default.
@@ -118,8 +118,8 @@ impl<'stdout> TerminalColor<'stdout> {
     /// let colored_terminal = color();
     /// colored_terminal.reset();
     /// ```
-    pub fn reset(&self) {
+    pub fn reset(&self)-> Result<()> {
-        self.color.reset(&self.stdout);
+        self.color.reset(&self.stdout)
     }
 
     /// Get available color count.

src/modules/style/mod.rs

@@ -22,7 +22,7 @@ pub use self::color::{color, from_screen, TerminalColor};
 pub use self::objectstyle::ObjectStyle;
 pub use self::styledobject::DisplayableObject;
 pub use self::styledobject::StyledObject;
-use super::functions;
+use common::{functions, error::Result};
 
 use TerminalOutput;
 
@@ -36,11 +36,11 @@ use TerminalOutput;
 /// so that color-related actions can be performed on both UNIX and Windows systems.
 trait ITerminalColor {
     /// Set the foreground color to the given color.
-    fn set_fg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>);
+    fn set_fg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Set the background color to the given color.
-    fn set_bg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>);
+    fn set_bg(&self, fg_color: Color, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Reset the terminal color to default.
-    fn reset(&self, stdout: &Option<&Arc<TerminalOutput>>);
+    fn reset(&self, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>;
     /// Gets an value that represents an color from the given `Color` and `ColorType`.
     fn color_value(&self, color: Color, color_type: ColorType) -> String;
 }
@@ -153,7 +153,7 @@ impl FromStr for Color {
     type Err = ();
 
     /// Convert a string to an Color value
-    fn from_str(src: &str) -> Result<Self, Self::Err> {
+    fn from_str(src: &str) -> ::std::result::Result<Self, Self::Err> {
         let src = src.to_lowercase();
 
         match src.as_ref() {

src/modules/style/styledobject.rs

@@ -5,6 +5,8 @@ use Screen;
 
 use std::fmt::{self, Display, Formatter};
 use std::io::Write;
+use common::error::Result;
+use std::result;
 
 use super::Attribute;
 
@@ -146,36 +148,37 @@ impl<'a, D: Display + 'a> StyledObject<D> {
     ///
     /// You should take not that `StyledObject` implements `Display`. You don't need to call paint unless you are on alternate screen.
     /// Checkout `into_displayable()` for more information about this.
-    pub fn paint(&self, screen: &Screen) {
+    pub fn paint(&self, screen: &Screen) -> Result<()> {
         let colored_terminal = from_screen(&screen);
         let mut reset = true;
 
         if let Some(bg) = self.object_style.bg_color {
-            colored_terminal.set_bg(bg);
+            colored_terminal.set_bg(bg)?;
             reset = true;
         }
 
         if let Some(fg) = self.object_style.fg_color {
-            colored_terminal.set_fg(fg);
+            colored_terminal.set_fg(fg)?;
             reset = true;
         }
 
         for attr in self.object_style.attrs.iter() {
             screen
                 .stdout
-                .write_string(format!(csi!("{}m"), *attr as i16));
+                .write_string(format!(csi!("{}m"), *attr as i16))?;
             reset = true;
         }
 
         use std::fmt::Write;
         let mut content = String::new();
-        write!(content, "{}", self.content).unwrap();
+        write!(content, "{}", self.content)?;
-        screen.stdout.write_string(content);
+        screen.stdout.write_string(content)?;
-        screen.stdout.flush();
+        screen.stdout.flush()?;
 
         if reset {
-            colored_terminal.reset();
+            colored_terminal.reset()?;
         }
+        Ok(())
     }
 
     /// This converts an styled object into an `DisplayableObject` witch implements: `Display` and could be used inside the write function of the standard library.
@@ -198,30 +201,30 @@ impl<'a, D: Display + 'a> StyledObject<D> {
 }
 
 impl<D: Display> Display for StyledObject<D> {
-    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut Formatter) -> result::Result<(), fmt::Error> {
         let colored_terminal = color();
         let mut reset = true;
 
         if let Some(bg) = self.object_style.bg_color {
-            colored_terminal.set_bg(bg);
+            colored_terminal.set_bg(bg).unwrap();
             reset = true;
         }
         if let Some(fg) = self.object_style.fg_color {
-            colored_terminal.set_fg(fg);
+            colored_terminal.set_fg(fg).unwrap();
             reset = true;
         }
 
         for attr in self.object_style.attrs.iter() {
-            write!(f, "{}", format!(csi!("{}m"), *attr as i16));
+            write!(f, "{}", format!(csi!("{}m"), *attr as i16))?;
             reset = true;
         }
 
         fmt::Display::fmt(&self.content, f)?;
-        std::io::stdout().flush().expect("Flush stdout failed");
+        std::io::stdout().flush().unwrap();
 
         if reset {
-            colored_terminal.reset();
+            colored_terminal.reset().unwrap();
-            std::io::stdout().flush().expect("Flush stdout failed");
+            std::io::stdout().flush().unwrap();
         }
         Ok(())
     }
@@ -248,8 +251,8 @@ impl<'a, D: Display + 'a> DisplayableObject<'a, D> {
 }
 
 impl<'a, D: Display + 'a> Display for DisplayableObject<'a, D> {
-    fn fmt(&self, _f: &mut Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, _f: &mut Formatter) -> result::Result<(), fmt::Error> {
-        self.styled_object.paint(&self.screen);
+        self.styled_object.paint(&self.screen).unwrap();
         Ok(())
     }
-}
+}

src/modules/style/winapi_color.rs

@@ -6,6 +6,7 @@ use kernel::windows_kernel::{Console, Handle, HandleType, ScreenBuffer};
 use std::io;
 use std::sync::{Once, ONCE_INIT};
 use winapi::um::wincon;
+use common::error::Result;
 
 /// This struct is a WinApi implementation for color related actions.
 pub struct WinApiColor;
@@ -17,14 +18,14 @@ impl WinApiColor {
 }
 
 impl ITerminalColor for WinApiColor {
-    fn set_fg(&self, fg_color: Color, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_fg(&self, fg_color: Color, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>{
         // init the original color in case it is not set.
-        let _ = init_console_color().unwrap();
+        let _ = init_console_color()?;
 
         let color_value = &self.color_value(fg_color, ColorType::Foreground);
 
-        let screen_buffer = ScreenBuffer::current().unwrap();
+        let screen_buffer = ScreenBuffer::current()?;
-        let csbi = screen_buffer.info().unwrap();
+        let csbi = screen_buffer.info()?;
 
         // Notice that the color values are stored in wAttribute.
         // So we need to use bitwise operators to check if the values exists or to get current console colors.
@@ -40,18 +41,19 @@ impl ITerminalColor for WinApiColor {
         }
 
         Console::from(**screen_buffer.get_handle())
-            .set_text_attribute(color)
+            .set_text_attribute(color)?;
-            .unwrap();
+
+        Ok(())
     }
 
-    fn set_bg(&self, bg_color: Color, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_bg(&self, bg_color: Color, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         // init the original color in case it is not set.
-        let _ = init_console_color().unwrap();
+        let _ = init_console_color()?;
 
         let color_value = &self.color_value(bg_color, ColorType::Background);
 
-        let screen_buffer = ScreenBuffer::current().unwrap();
+        let screen_buffer = ScreenBuffer::current()?;
-        let csbi = screen_buffer.info().unwrap();
+        let csbi = screen_buffer.info()?;
 
         // Notice that the color values are stored in wAttribute.
         // So wee need to use bitwise operators to check if the values exists or to get current console colors.
@@ -67,16 +69,18 @@ impl ITerminalColor for WinApiColor {
         }
 
         Console::from(**screen_buffer.get_handle())
-            .set_text_attribute(color)
+            .set_text_attribute(color)?;
-            .unwrap();
+
+        Ok(())
     }
 
-    fn reset(&self, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn reset(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         // init the original color in case it is not set.
         let original_color = original_console_color();
-        Console::from(Handle::new(HandleType::CurrentOutputHandle).unwrap())
+        Console::from(Handle::new(HandleType::CurrentOutputHandle)?)
-            .set_text_attribute(original_color)
+            .set_text_attribute(original_color)?;
-            .unwrap();
+
+        Ok(())
     }
 
     /// This will get the winapi color value from the Color and ColorType struct

src/modules/terminal/ansi_terminal.rs

@@ -2,6 +2,7 @@
 //! This module is used for windows 10 terminals and unix terminals by default.
 
 use super::*;
+use common::error::Result;
 
 /// This struct is an ansi escape code implementation for terminal related actions.
 pub struct AnsiTerminal;
@@ -14,41 +15,45 @@ impl AnsiTerminal {
 }
 
 impl ITerminal for AnsiTerminal {
-    fn clear(&self, clear_type: ClearType, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn clear(&self, clear_type: ClearType, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         match clear_type {
             ClearType::All => {
-                functions::write_str(&stdout, csi!("2J"));
+                functions::write_str(&stdout, csi!("2J"))?;
-                TerminalCursor::new().goto(0, 0);
+                TerminalCursor::new().goto(0, 0)?;
             }
             ClearType::FromCursorDown => {
-                functions::write_str(&stdout, csi!("J"));
+                functions::write_str(&stdout, csi!("J"))?;
             }
             ClearType::FromCursorUp => {
-                functions::write_str(&stdout, csi!("1J"));
+                functions::write_str(&stdout, csi!("1J"))?;
             }
             ClearType::CurrentLine => {
-                functions::write_str(&stdout, csi!("2K"));
+                functions::write_str(&stdout, csi!("2K"))?;
             }
             ClearType::UntilNewLine => {
-                functions::write_str(&stdout, csi!("K"));
+                functions::write_str(&stdout, csi!("K"))?;
             }
         };
+        Ok(())
     }
 
     fn terminal_size(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> (u16, u16) {
         functions::get_terminal_size()
     }
 
-    fn scroll_up(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn scroll_up(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>{
-        functions::write(&stdout, format!(csi!("{}S"), count));
+        functions::write(&stdout, format!(csi!("{}S"), count))?;
+        Ok(())
     }
 
-    fn scroll_down(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn scroll_down(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(&stdout, format!(csi!("{}T"), count));
+        functions::write(&stdout, format!(csi!("{}T"), count))?;
+        Ok(())
     }
 
-    fn set_size(&self, width: i16, height: i16, stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_size(&self, width: i16, height: i16, stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        functions::write(&stdout, format!(csi!("8;{};{}t"), height, width));
+        functions::write(&stdout, format!(csi!("8;{};{}t"), height, width))?;
+        Ok(())
     }
 
     fn exit(&self, stdout: &Option<&Arc<TerminalOutput>>) {

src/modules/terminal/mod.rs

@@ -15,7 +15,7 @@ use self::winapi_terminal::WinApiTerminal;
 
 pub use self::terminal::{from_screen, terminal, Terminal};
 
-use super::functions;
+use common::{functions, error};
 use std::sync::Arc;
 use {Screen, TerminalOutput};
 
@@ -38,15 +38,15 @@ pub enum ClearType {
 /// so that terminal related actions can be preformed on both Unix and Windows systems.
 trait ITerminal {
     /// Clear the current cursor by specifying the clear type
-    fn clear(&self, clear_type: ClearType, stdout: &Option<&Arc<TerminalOutput>>);
+    fn clear(&self, clear_type: ClearType, stdout: &Option<&Arc<TerminalOutput>>) -> error::Result<()>;
     /// Get the terminal size (x,y)
     fn terminal_size(&self, stdout: &Option<&Arc<TerminalOutput>>) -> (u16, u16);
     /// Scroll `n` lines up in the current terminal.
-    fn scroll_up(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn scroll_up(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) -> error::Result<()>;
     /// Scroll `n` lines down in the current terminal.
-    fn scroll_down(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn scroll_down(&self, count: i16, stdout: &Option<&Arc<TerminalOutput>>) -> error::Result<()>;
     /// Resize terminal to the given width and height.
-    fn set_size(&self, width: i16, height: i16, stdout: &Option<&Arc<TerminalOutput>>);
+    fn set_size(&self, width: i16, height: i16, stdout: &Option<&Arc<TerminalOutput>>) -> error::Result<()>;
     /// Close the current terminal
     fn exit(&self, stdout: &Option<&Arc<TerminalOutput>>);
 }

src/modules/terminal/terminal.rs

@@ -2,7 +2,7 @@
 //! Like clearing and scrolling in the terminal or getting the window size from the terminal.
 
 use super::*;
-
+use common::error::Result;
 use std::fmt;
 
 /// Struct that stores a platform-specific platform implementation for terminal related actions.
@@ -93,8 +93,8 @@ impl<'stdout> Terminal<'stdout> {
     /// // clear all cells from cursor position until new line in terminal.
     /// term.clear(terminal::ClearType::UntilNewLine);
     /// ```
-    pub fn clear(&self, clear_type: ClearType) {
+    pub fn clear(&self, clear_type: ClearType) -> Result<()> {
-        self.terminal.clear(clear_type, &self.screen);
+        self.terminal.clear(clear_type, &self.screen)
     }
 
     /// Get the terminal size (x,y).
@@ -117,8 +117,8 @@ impl<'stdout> Terminal<'stdout> {
     /// // scroll up by 5 lines
     /// let size = term.scroll_up(5);
     /// ```
-    pub fn scroll_up(&self, count: i16) {
+    pub fn scroll_up(&self, count: i16) -> Result<()> {
-        self.terminal.scroll_up(count, &self.screen);
+        self.terminal.scroll_up(count, &self.screen)
     }
 
     /// Scroll `n` lines up in the current terminal.
@@ -129,8 +129,8 @@ impl<'stdout> Terminal<'stdout> {
     /// // scroll down by 5 lines
     /// let size = term.scroll_down(5);
     /// ```
-    pub fn scroll_down(&self, count: i16) {
+    pub fn scroll_down(&self, count: i16) -> Result<()> {
-        self.terminal.scroll_down(count, &self.screen);
+        self.terminal.scroll_down(count, &self.screen)
     }
 
     /// Set the terminal size. Note that not all terminals can be set to a very small scale.
@@ -141,8 +141,8 @@ impl<'stdout> Terminal<'stdout> {
     /// // Set of the size to X: 10 and Y: 10
     /// let size = term.set_size(10,10);
     /// ```
-    pub fn set_size(&self, width: i16, height: i16) {
+    pub fn set_size(&self, width: i16, height: i16) -> Result<()> {
-        self.terminal.set_size(width, height, &self.screen);
+        self.terminal.set_size(width, height, &self.screen)
     }
 
     /// Exit the current process.
@@ -163,11 +163,12 @@ impl<'stdout> Terminal<'stdout> {
     ///
     /// let size = term.write("Some text \n Some text on new line");
     /// ```
-    pub fn write<D: fmt::Display>(&self, value: D) {
+    pub fn write<D: fmt::Display>(&self, value: D) -> Result<usize> {
         use std::fmt::Write;
         let mut string = String::new();
-        write!(string, "{}", value).unwrap();
+        write!(string, "{}", value)?;
-        functions::write(&self.screen, string);
+        let size = functions::write(&self.screen, string)?;
+        Ok(size)
     }
 }
 

src/modules/terminal/winapi_terminal.rs

@@ -4,7 +4,7 @@
 //! Windows versions lower then windows 10 are not supporting ANSI codes. Those versions will use this implementation instead.
 
 use super::*;
-
+use common::error::{Result, ErrorKind};
 use kernel::windows_kernel::{Console, Coord, Cursor, Handle, ScreenBuffer, Size};
 
 /// This struct is an winapi implementation for terminal related actions.
@@ -17,9 +17,9 @@ impl WinApiTerminal {
 }
 
 impl ITerminal for WinApiTerminal {
-    fn clear(&self, clear_type: ClearType, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn clear(&self, clear_type: ClearType, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        let screen_buffer = ScreenBuffer::current().unwrap();
+        let screen_buffer = ScreenBuffer::current()?;
-        let csbi = screen_buffer.info().unwrap();
+        let csbi = screen_buffer.info()?;
 
         let pos = csbi.cursor_pos();
         let buffer_size = csbi.buffer_size();
@@ -27,13 +27,14 @@ impl ITerminal for WinApiTerminal {
 
         match clear_type {
             ClearType::All => {
-                clear_entire_screen(buffer_size, current_attribute);
+                clear_entire_screen(buffer_size, current_attribute)?;
             }
-            ClearType::FromCursorDown => clear_after_cursor(pos, buffer_size, current_attribute),
+            ClearType::FromCursorDown => clear_after_cursor(pos, buffer_size, current_attribute)?,
-            ClearType::FromCursorUp => clear_before_cursor(pos, buffer_size, current_attribute),
+            ClearType::FromCursorUp => clear_before_cursor(pos, buffer_size, current_attribute)?,
-            ClearType::CurrentLine => clear_current_line(pos, buffer_size, current_attribute),
+            ClearType::CurrentLine => clear_current_line(pos, buffer_size, current_attribute)?,
-            ClearType::UntilNewLine => clear_until_line(pos, buffer_size, current_attribute),
+            ClearType::UntilNewLine => clear_until_line(pos, buffer_size, current_attribute)?,
         };
+        Ok(())
     }
 
     fn terminal_size(&self, _stdout: &Option<&Arc<TerminalOutput>>) -> (u16, u16) {
@@ -41,53 +42,51 @@ impl ITerminal for WinApiTerminal {
         csbi.info().unwrap().terminal_size().into()
     }
 
-    fn scroll_up(&self, count: i16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn scroll_up(&self, count: i16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
-        let csbi = ScreenBuffer::current().unwrap();
+        let csbi = ScreenBuffer::current()?;
-        let mut window = csbi.info().unwrap().terminal_window();
+        let mut window = csbi.info()?.terminal_window();
 
         // Check whether the window is too close to the screen buffer top
         if window.top >= count {
             window.top -= count; // move top down
             window.bottom = count; // move bottom down
 
-            Console::new()
+            Console::new()?.set_console_info(false, window)?;
-                .unwrap()
-                .set_console_info(false, window)
-                .unwrap();
         }
+        Ok(())
     }
 
-    fn scroll_down(&self, count: i16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn scroll_down(&self, count: i16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()>{
-        let csbi = ScreenBuffer::current().unwrap();
+        let screen_buffer = ScreenBuffer::current()?;
-        let mut window = csbi.info().unwrap().terminal_window();
+        let csbi = screen_buffer.info()?;
-        let buffer_size = csbi.info().unwrap().buffer_size();
+        let mut window = csbi.terminal_window();
+        let buffer_size =csbi.buffer_size();
 
         // Check whether the window is too close to the screen buffer top
         if window.bottom < buffer_size.height - count {
             window.top += count; // move top down
             window.bottom += count; // move bottom down
 
-            Console::new()
+            Console::new()?
-                .unwrap()
+                .set_console_info(false, window)?;
-                .set_console_info(false, window)
-                .unwrap();
         }
+        Ok(())
     }
 
     /// Set the current terminal size
-    fn set_size(&self, width: i16, height: i16, _stdout: &Option<&Arc<TerminalOutput>>) {
+    fn set_size(&self, width: i16, height: i16, _stdout: &Option<&Arc<TerminalOutput>>) -> Result<()> {
         if width <= 0 {
-            panic!("Cannot set the terminal width lower than 1");
+            return Err(ErrorKind::ResizingTerminalFailure(String::from("Cannot set the terminal width lower than 1")));
         }
 
         if height <= 0 {
-            panic!("Cannot set the terminal height lower then 1")
+            return Err(ErrorKind::ResizingTerminalFailure(String::from("Cannot set the terminal height lower then 1")));
         }
 
         // Get the position of the current console window
-        let screen_buffer = ScreenBuffer::current().unwrap();
+        let screen_buffer = ScreenBuffer::current()?;
         let console = Console::from(**screen_buffer.get_handle());
-        let csbi = screen_buffer.info().unwrap();
+        let csbi = screen_buffer.info()?;
 
         let current_size = csbi.buffer_size();
         let window = csbi.terminal_window();
@@ -100,7 +99,7 @@ impl ITerminal for WinApiTerminal {
 
         if current_size.width < window.left + width {
             if window.left >= i16::max_value() - width {
-                panic!("Argument out of range when setting terminal width.");
+                return Err(ErrorKind::ResizingTerminalFailure(String::from("Argument out of range when setting terminal width.")));
             }
 
             new_size.width = window.left + width;
@@ -108,7 +107,7 @@ impl ITerminal for WinApiTerminal {
         }
         if current_size.height < window.top + height {
             if window.top >= i16::max_value() - height {
-                panic!("Argument out of range when setting terminal height");
+                return Err(ErrorKind::ResizingTerminalFailure(String::from("Argument out of range when setting terminal height.")));
             }
 
             new_size.height = window.top + height;
@@ -117,7 +116,7 @@ impl ITerminal for WinApiTerminal {
 
         if resize_buffer {
             if let Err(_) = screen_buffer.set_size(new_size.width, new_size.height) {
-                panic!("Something went wrong when setting screen buffer size.");
+                return Err(ErrorKind::ResizingTerminalFailure(String::from("Something went wrong when setting screen buffer size.")));
             }
         }
 
@@ -125,29 +124,25 @@ impl ITerminal for WinApiTerminal {
         // Preserve the position, but change the size.
         window.bottom = window.top + height;
         window.right = window.left + width;
-        console.set_console_info(true, window).unwrap();
+        console.set_console_info(true, window)?;
 
         // If we resized the buffer, un-resize it.
         if resize_buffer {
             if let Err(_) = screen_buffer.set_size(current_size.width, current_size.height) {
-                panic!("Something went wrong when setting screen buffer size.");
+                return Err(ErrorKind::ResizingTerminalFailure(String::from("Something went wrong when setting screen buffer size.")));
             }
         }
 
         let bounds = console.largest_window_size();
 
         if width > bounds.x {
-            panic!(
+            return Err(ErrorKind::ResizingTerminalFailure(format!("Argument width: {} out of range when setting terminal width.", width)));
-                "Argument width: {} out of range when setting terminal width.",
-                width
-            );
         }
         if height > bounds.y {
-            panic!(
+            return Err(ErrorKind::ResizingTerminalFailure(format!("Argument height: {} out of range when setting terminal height", width)));
-                "Argument height: {} out of range when setting terminal height",
-                height
-            );
         }
+
+        Ok(())
     }
 
     fn exit(&self, stdout: &Option<&Arc<TerminalOutput>>) {
@@ -160,7 +155,7 @@ impl ITerminal for WinApiTerminal {
     }
 }
 
-pub fn clear_after_cursor(location: Coord, buffer_size: Size, current_attribute: u16) {
+pub fn clear_after_cursor(location: Coord, buffer_size: Size, current_attribute: u16) -> Result<()> {
     let (mut x, mut y) = (location.x, location.y);
 
     // if cursor position is at the outer right position
@@ -175,10 +170,10 @@ pub fn clear_after_cursor(location: Coord, buffer_size: Size, current_attribute:
     // get sum cells before cursor
     let cells_to_write = buffer_size.width as u32 * buffer_size.height as u32;
 
-    clear(start_location, cells_to_write, current_attribute);
+    clear(start_location, cells_to_write, current_attribute)
 }
 
-pub fn clear_before_cursor(location: Coord, buffer_size: Size, current_attribute: u16) {
+pub fn clear_before_cursor(location: Coord, buffer_size: Size, current_attribute: u16) -> Result<()> {
     let (xpos, ypos) = (location.x, location.y);
 
     // one cell after cursor position
@@ -193,10 +188,10 @@ pub fn clear_before_cursor(location: Coord, buffer_size: Size, current_attribute
     let cells_to_write = (buffer_size.width as u32 * ypos as u32) + (xpos as u32 + 1);
 
     // clear everything before cursor position
-    clear(start_location, cells_to_write, current_attribute);
+    clear(start_location, cells_to_write, current_attribute)
 }
 
-pub fn clear_entire_screen(buffer_size: Size, current_attribute: u16) {
+pub fn clear_entire_screen(buffer_size: Size, current_attribute: u16) -> Result<()> {
     // get sum cells before cursor
     let cells_to_write = buffer_size.width as u32 * buffer_size.height as u32;
 
@@ -204,14 +199,15 @@ pub fn clear_entire_screen(buffer_size: Size, current_attribute: u16) {
     let start_location = Coord::new(0, 0);
 
     // clear the entire screen
-    clear(start_location, cells_to_write, current_attribute);
+    clear(start_location, cells_to_write, current_attribute)?;
 
     // put the cursor back at cell 0,0
-    let cursor = Cursor::new().unwrap();
+    let cursor = Cursor::new()?;
-    cursor.goto(0, 0);
+    cursor.goto(0, 0)?;
+    Ok(())
 }
 
-pub fn clear_current_line(location: Coord, buffer_size: Size, current_attribute: u16) {
+pub fn clear_current_line(location: Coord, buffer_size: Size, current_attribute: u16) -> Result<()> {
     // location where to start clearing
     let start_location = Coord::new(0, location.y);
 
@@ -219,14 +215,15 @@ pub fn clear_current_line(location: Coord, buffer_size: Size, current_attribute:
     let cells_to_write = buffer_size.width as u32;
 
     // clear the whole current line
-    clear(start_location, cells_to_write, current_attribute);
+    clear(start_location, cells_to_write, current_attribute)?;
 
     // put the cursor back at cell 1 on current row
-    let cursor = Cursor::new().unwrap();
+    let cursor = Cursor::new()?;
-    cursor.goto(0, location.y);
+    cursor.goto(0, location.y)?;
+    Ok(())
 }
 
-pub fn clear_until_line(location: Coord, buffer_size: Size, current_attribute: u16) {
+pub fn clear_until_line(location: Coord, buffer_size: Size, current_attribute: u16) -> Result<()> {
     let (x, y) = (location.x, location.y);
 
     // location where to start clearing
@@ -236,19 +233,20 @@ pub fn clear_until_line(location: Coord, buffer_size: Size, current_attribute: u
     let cells_to_write = (buffer_size.width - x as i16) as u32;
 
     // clear until the current line
-    clear(start_location, cells_to_write, current_attribute);
+    clear(start_location, cells_to_write, current_attribute)?;
 
     // put the cursor back at original cursor position before we did the clearing
-    let cursor = Cursor::new().unwrap();
+    let cursor = Cursor::new()?;
-    cursor.goto(x, y);
+    cursor.goto(x, y)?;
+    Ok(())
 }
 
-fn clear(start_location: Coord, cells_to_write: u32, current_attribute: u16) {
+fn clear(start_location: Coord, cells_to_write: u32, current_attribute: u16) -> Result<()> {
-    let console = Console::from(Handle::current_out_handle().unwrap());
+    let console = Console::from(Handle::current_out_handle()?);
     let _ = console
-        .fill_whit_character(start_location, cells_to_write, ' ')
+        .fill_whit_character(start_location, cells_to_write, ' ')?;
-        .unwrap();
     console
-        .fill_whit_attribute(start_location, cells_to_write, current_attribute)
+        .fill_whit_attribute(start_location, cells_to_write, current_attribute)?;
-        .unwrap();
+
+    Ok(())
 }