Start extracting vim shell ui processing to shell file

src/main.rs

@@ -11,6 +11,7 @@ extern crate neovim_lib;
 extern crate phf;
 
 mod nvim;
+mod shell;
 mod ui_model;
 mod ui;
 mod input;

src/nvim.rs

@@ -3,7 +3,7 @@ use std::io::{Result, Error, ErrorKind};
 use std::result;
 use ui_model::UiModel;
 use ui;
-use ui::Ui;
+use shell::Shell;
 use glib;
 
 pub trait RedrawEvents {
@@ -64,7 +64,7 @@ macro_rules! try_uint {
     })
 }
 
-pub fn initialize(ui: &mut Ui,
+pub fn initialize(ui: &mut Shell,
                   nvim_bin_path: Option<&String>)
                   -> Result<()> {
     let session = if let Some(path) = nvim_bin_path {
@@ -140,7 +140,7 @@ fn nvim_cb(method: &str, params: Vec<Value>) {
     }
 }
 
-fn call_gui_event(ui: &mut Ui, method: &str, args: &Vec<Value>) -> result::Result<(), String> {
+fn call_gui_event(ui: &mut Shell, method: &str, args: &Vec<Value>) -> result::Result<(), String> {
     match method {
         "Font" => ui.set_font(try_str!(args[0])),
         _ => return Err(format!("Unsupported event {}({:?})", method, args)),
@@ -148,7 +148,7 @@ fn call_gui_event(ui: &mut Ui, method: &str, args: &Vec<Value>) -> result::Resul
     Ok(())
 }
 
-fn call(ui: &mut Ui, method: &str, args: &Vec<Value>) -> result::Result<(), String> {
+fn call(ui: &mut Shell, method: &str, args: &Vec<Value>) -> result::Result<(), String> {
     match method {
         "cursor_goto" => ui.on_cursor_goto(try_uint!(args[0]), try_uint!(args[1])),
         "put" => ui.on_put(try_str!(args[0])),
@@ -182,10 +182,10 @@ fn call(ui: &mut Ui, method: &str, args: &Vec<Value>) -> result::Result<(), Stri
 }
 
 fn safe_call<F>(cb: F)
-    where F: Fn(&mut Ui) -> result::Result<(), String> + 'static + Send
+    where F: Fn(&mut Shell) -> result::Result<(), String> + 'static + Send
 {
     glib::idle_add(move || {
-        ui::UI.with(|ui_cell| if let Err(msg) = cb(&mut *ui_cell.borrow_mut()) {
+        ui::UI.with(|ui_cell| if let Err(msg) = cb(&mut ui_cell.borrow_mut().shell) {
             println!("Error call function: {}", msg);
         });
         glib::Continue(false)

src/shell.rs

@@ -0,0 +1,557 @@
+use std::string::String;
+
+use cairo;
+use pangocairo as pc;
+use pango;
+use pango::FontDescription;
+use gdk::{ModifierType, Event, EventKey, EventConfigure, EventButton, EventMotion, EventType};
+use gdk_sys;
+use glib;
+use gtk::prelude::*;
+use gtk;
+use gtk::{ApplicationWindow, HeaderBar, DrawingArea, ToolButton, Image};
+
+use neovim_lib::{Neovim, NeovimApi, Value, Integer};
+
+use settings;
+use ui_model::{UiModel, Cell, Attrs, Color, COLOR_BLACK, COLOR_WHITE, COLOR_RED};
+use nvim::{RedrawEvents, GuiApi, ErrorReport};
+use input::{convert_key, keyval_to_input_string};
+use ui::{UI, Ui, SET};
+
+const DEFAULT_FONT_NAME: &'static str = "DejaVu Sans Mono 12";
+
+macro_rules! SHELL {
+    ($id:ident = $expr:expr) => (
+        UI.with(|ui_cell| {
+        let mut $id = ui_cell.borrow_mut().shell;
+        $expr
+    });
+    )
+}
+
+#[derive(PartialEq)]
+pub enum NvimMode {
+    Normal,
+    Insert,
+    Other,
+}
+
+pub struct Shell {
+    pub model: UiModel,
+    pub drawing_area: DrawingArea,
+    nvim: Option<Neovim>,
+    cur_attrs: Option<Attrs>,
+    bg_color: Color,
+    fg_color: Color,
+    sp_color: Color,
+    line_height: Option<f64>,
+    char_width: Option<f64>,
+    pub mode: NvimMode,
+    mouse_enabled: bool,
+    mouse_pressed: bool,
+    font_desc: FontDescription,
+    resize_timer: Option<glib::SourceId>,
+}
+
+impl Shell {
+    pub fn new() -> Shell {
+        Shell { 
+            model: UiModel::empty(),
+            drawing_area: DrawingArea::new(),
+            nvim: None,
+            cur_attrs: None,
+            bg_color: COLOR_BLACK,
+            fg_color: COLOR_WHITE,
+            sp_color: COLOR_RED,
+            line_height: None,
+            char_width: None,
+            mode: NvimMode::Normal,
+            mouse_enabled: false,
+            mouse_pressed: false,
+            font_desc: FontDescription::from_string(DEFAULT_FONT_NAME),
+            resize_timer: None,
+        }
+    }
+
+    pub fn init(&mut self) {
+        self.drawing_area.set_size_request(500, 300);
+        self.drawing_area.set_hexpand(true);
+        self.drawing_area.set_vexpand(true);
+
+        self.drawing_area
+            .set_events((gdk_sys::GDK_BUTTON_RELEASE_MASK | gdk_sys::GDK_BUTTON_PRESS_MASK |
+                         gdk_sys::GDK_BUTTON_MOTION_MASK)
+                            .bits() as i32);
+        self.drawing_area.connect_button_press_event(gtk_button_press);
+        self.drawing_area.connect_button_release_event(gtk_button_release);
+        self.drawing_area.connect_motion_notify_event(gtk_motion_notify);
+        self.drawing_area.connect_draw(gtk_draw);
+        self.drawing_area.connect_key_press_event(gtk_key_press);
+    }
+
+    pub fn add_configure_event(&mut self) {
+        self.drawing_area.connect_configure_event(gtk_configure_event);
+    }
+
+    pub fn set_nvim(&mut self, nvim: Neovim) {
+        self.nvim = Some(nvim);
+    }
+
+    pub fn nvim(&mut self) -> &mut Neovim {
+        self.nvim.as_mut().unwrap()
+    }
+
+    fn create_pango_font(&self) -> FontDescription {
+        self.font_desc.clone()
+    }
+
+    pub fn set_font_desc(&mut self, desc: &str) {
+        self.font_desc = FontDescription::from_string(desc);
+    }
+
+    fn colors<'a>(&'a self, cell: &'a Cell) -> (&'a Color, &'a Color) {
+        let bg = if let Some(ref bg) = cell.attrs.background {
+            bg
+        } else {
+            &self.bg_color
+        };
+        let fg = if let Some(ref fg) = cell.attrs.foreground {
+            fg
+        } else {
+            &self.fg_color
+        };
+
+        if cell.attrs.reverse {
+            (fg, bg)
+        } else {
+            (bg, fg)
+        }
+    }
+}
+
+fn gtk_button_press(_: &DrawingArea, ev: &EventButton) -> Inhibit {
+    if ev.get_event_type() != EventType::ButtonPress {
+        return Inhibit(false);
+    }
+
+    SHELL!(shell = {
+        if !shell.mouse_enabled {
+            return;
+        }
+
+        mouse_input(&mut shell, "LeftMouse", ev.get_state(), ev.get_position());
+    });
+    Inhibit(false)
+}
+
+fn mouse_input(shell: &mut Shell, input: &str, state: ModifierType, position: (f64, f64)) {
+    if let Some(line_height) = shell.line_height {
+        if let Some(char_width) = shell.char_width {
+            shell.mouse_pressed = true;
+
+            let nvim = shell.nvim();
+            let (x, y) = position;
+            let col = (x / char_width).trunc() as u64;
+            let row = (y / line_height).trunc() as u64;
+            let input_str = format!("{}<{},{}>", keyval_to_input_string(input, state), col, row);
+            nvim.input(&input_str).expect("Can't send mouse input event");
+        }
+    }
+}
+
+fn gtk_button_release(_: &DrawingArea, _: &EventButton) -> Inhibit {
+    SHELL!(shell = {
+        shell.mouse_pressed = false;
+    });
+    Inhibit(false)
+}
+
+fn gtk_motion_notify(_: &DrawingArea, ev: &EventMotion) -> Inhibit {
+    SHELL!(shell = {
+        if !shell.mouse_enabled || !shell.mouse_pressed {
+            return;
+        }
+
+        mouse_input(&mut shell, "LeftDrag", ev.get_state(), ev.get_position());
+    });
+    Inhibit(false)
+}
+
+fn gtk_key_press(_: &DrawingArea, ev: &EventKey) -> Inhibit {
+    if let Some(input) = convert_key(ev) {
+        SHELL!(shell = {
+            shell.nvim().input(&input).expect("Error run input command to nvim");
+        });
+        Inhibit(true)
+    } else {
+        Inhibit(false)
+    }
+}
+
+fn gtk_draw(_: &DrawingArea, ctx: &cairo::Context) -> Inhibit {
+    UI.with(|ui_cell| {
+        let mut ui = ui_cell.borrow_mut();
+
+        let (width, height) = calc_char_bounds(&ui.shell, ctx);
+        ui.shell.line_height = Some(height as f64);
+        ui.shell.char_width = Some(width as f64);
+
+        draw(&ui.shell, ctx);
+        request_width(&ui);
+    });
+
+    Inhibit(false)
+}
+
+#[inline]
+fn draw_joined_rect(shell: &Shell,
+                    ctx: &cairo::Context,
+                    from_col_idx: usize,
+                    col_idx: usize,
+                    char_width: f64,
+                    line_height: f64,
+                    color: &Color) {
+    let current_point = ctx.get_current_point();
+    let rect_width = char_width * (col_idx - from_col_idx) as f64;
+
+    if &shell.bg_color != color {
+        ctx.set_source_rgb(color.0, color.1, color.2);
+        ctx.rectangle(current_point.0, current_point.1, rect_width, line_height);
+        ctx.fill();
+    }
+
+    ctx.move_to(current_point.0 + rect_width, current_point.1);
+}
+
+fn draw(shell: &Shell, ctx: &cairo::Context) {
+    ctx.set_source_rgb(shell.bg_color.0, shell.bg_color.1, shell.bg_color.2);
+    ctx.paint();
+
+    let line_height = shell.line_height.unwrap();
+    let char_width = shell.char_width.unwrap();
+    let (row, col) = shell.model.get_cursor();
+    let mut buf = String::with_capacity(4);
+
+    let mut line_y: f64 = 0.0;
+
+
+    let layout = pc::create_layout(ctx);
+    let mut desc = shell.create_pango_font();
+
+    for (line_idx, line) in shell.model.model().iter().enumerate() {
+        ctx.move_to(0.0, line_y);
+
+        // first draw background
+        // here we join same bg color for given line
+        // this gives less drawing primitives
+        let mut from_col_idx = 0;
+        let mut from_bg = None;
+        for (col_idx, cell) in line.iter().enumerate() {
+            let (bg, _) = shell.colors(cell);
+
+            if from_bg.is_none() {
+                from_bg = Some(bg);
+                from_col_idx = col_idx;
+            } else if from_bg != Some(bg) {
+                draw_joined_rect(shell,
+                                 ctx,
+                                 from_col_idx,
+                                 col_idx,
+                                 char_width,
+                                 line_height,
+                                 from_bg.take().unwrap());
+                from_bg = Some(bg);
+                from_col_idx = col_idx;
+            }
+        }
+        draw_joined_rect(shell,
+                         ctx,
+                         from_col_idx,
+                         line.len(),
+                         char_width,
+                         line_height,
+                         from_bg.take().unwrap());
+
+        ctx.move_to(0.0, line_y);
+
+        for (col_idx, cell) in line.iter().enumerate() {
+            let double_width = line.get(col_idx + 1).map(|c| c.attrs.double_width).unwrap_or(false);
+            let current_point = ctx.get_current_point();
+
+            let (bg, fg) = shell.colors(cell);
+
+            if row == line_idx && col == col_idx {
+                ctx.set_source_rgba(1.0 - bg.0, 1.0 - bg.1, 1.0 - bg.2, 0.5);
+
+                let cursor_width = if shell.mode == NvimMode::Insert {
+                    char_width / 5.0
+                } else {
+                    if double_width {
+                        char_width * 2.0
+                    } else {
+                        char_width
+                    }
+                };
+
+                ctx.rectangle(current_point.0, line_y, cursor_width, line_height);
+                ctx.fill();
+                ctx.move_to(current_point.0, current_point.1);
+            }
+
+
+            if !cell.ch.is_whitespace() {
+                update_font_description(&mut desc, &cell.attrs);
+
+                layout.set_font_description(Some(&desc));
+                buf.clear();
+                buf.push(cell.ch);
+                layout.set_text(&buf, -1);
+
+                // correct layout for double_width chars
+                if double_width {
+                    let (dw_width, dw_height) = layout.get_pixel_size();
+                    let x_offset = (char_width * 2.0 - dw_width as f64) / 2.0;
+                    let y_offset = (line_height - dw_height as f64) / 2.0;
+                    ctx.rel_move_to(x_offset, y_offset);
+                }
+
+                ctx.set_source_rgb(fg.0, fg.1, fg.2);
+                pc::update_layout(ctx, &layout);
+                pc::show_layout(ctx, &layout);
+            }
+
+            if cell.attrs.underline || cell.attrs.undercurl {
+                // [TODO]: Current gtk-rs bindings does not provide fontmetrics access
+                // so it is not possible to find right position for underline or undercurl position
+                // > update_font_description(&mut desc, &cell.attrs);
+                // > layout.get_context().unwrap().get_metrics();
+                let top_offset = line_height * 0.9;
+
+                let sp = if let Some(ref sp) = cell.attrs.special {
+                    sp
+                } else {
+                    &shell.sp_color
+                };
+
+                ctx.set_source_rgba(sp.0, sp.1, sp.2, 0.7);
+                if cell.attrs.undercurl {
+                    ctx.set_dash(&[4.0, 2.0], 0.0);
+                    ctx.set_line_width(2.0);
+                    ctx.move_to(current_point.0, line_y + top_offset);
+                    ctx.line_to(current_point.0 + char_width, line_y + top_offset);
+                    ctx.stroke();
+                    ctx.set_dash(&[], 0.0);
+                } else if cell.attrs.underline {
+                    ctx.set_line_width(1.0);
+                    ctx.move_to(current_point.0, line_y + top_offset);
+                    ctx.line_to(current_point.0 + char_width, line_y + top_offset);
+                    ctx.stroke();
+                }
+            }
+
+            ctx.move_to(current_point.0 + char_width, current_point.1);
+        }
+
+        line_y += line_height;
+    }
+}
+
+#[inline]
+fn update_font_description(desc: &mut FontDescription, attrs: &Attrs) {
+    desc.unset_fields(pango::FONT_MASK_STYLE | pango::FONT_MASK_WEIGHT);
+    if attrs.italic {
+        desc.set_style(pango::Style::Italic);
+    }
+    if attrs.bold {
+        desc.set_weight(pango::Weight::Bold);
+    }
+}
+
+fn calc_char_bounds(shell: &Shell, ctx: &cairo::Context) -> (i32, i32) {
+    let layout = pc::create_layout(ctx);
+
+    let desc = shell.create_pango_font();
+    layout.set_font_description(Some(&desc));
+    layout.set_text("A", -1);
+
+    layout.get_pixel_size()
+}
+
+fn request_width(ui: &Ui) {
+    if ui.shell.resize_timer.is_some() {
+        return;
+    }
+
+    let width = ui.shell.drawing_area.get_allocated_width();
+    let height = ui.shell.drawing_area.get_allocated_height();
+    let request_height = (ui.shell.model.rows as f64 * ui.shell.line_height.unwrap()) as i32;
+    let request_width = (ui.shell.model.columns as f64 * ui.shell.char_width.unwrap()) as i32;
+
+    if width != request_width || height != request_height {
+        let window = ui.window.as_ref().unwrap();
+        let (win_width, win_height) = window.get_size();
+        let h_border = win_width - width;
+        let v_border = win_height - height;
+        window.resize(request_width + h_border, request_height + v_border);
+    }
+}
+
+fn split_color(indexed_color: u64) -> Color {
+    let r = ((indexed_color >> 16) & 0xff) as f64;
+    let g = ((indexed_color >> 8) & 0xff) as f64;
+    let b = (indexed_color & 0xff) as f64;
+    Color(r / 255.0, g / 255.0, b / 255.0)
+}
+
+fn gtk_configure_event(_: &DrawingArea, ev: &EventConfigure) -> bool {
+    SHELL!(shell = {
+        let (width, height) = ev.get_size();
+
+        if let Some(timer) = shell.resize_timer {
+            glib::source_remove(timer);
+        }
+        if let Some(line_height) = shell.line_height {
+            if let Some(char_width) = shell.char_width {
+
+                shell.resize_timer = Some(glib::timeout_add(250, move || {
+                    SHELL!(shell = {
+                        shell.resize_timer = None;
+
+                        let rows = (height as f64 / line_height).trunc() as usize;
+                        let columns = (width as f64 / char_width).trunc() as usize;
+                        if shell.model.rows != rows || shell.model.columns != columns {
+                            if let Err(err) = shell.nvim().ui_try_resize(columns as u64, rows as u64) {
+                                println!("Error trying resize nvim {}", err);
+                            }
+                        }
+                    });
+                    Continue(false)
+                }));
+            }
+        }
+    });
+    false
+}
+
+impl RedrawEvents for Shell {
+    fn on_cursor_goto(&mut self, row: u64, col: u64) {
+        self.model.set_cursor(row, col);
+    }
+
+    fn on_put(&mut self, text: &str) {
+        self.model.put(text, self.cur_attrs.as_ref());
+    }
+
+    fn on_clear(&mut self) {
+        self.model.clear();
+    }
+
+    fn on_eol_clear(&mut self) {
+        self.model.eol_clear();
+    }
+
+    fn on_resize(&mut self, columns: u64, rows: u64) {
+        self.model = UiModel::new(rows, columns);
+    }
+
+    fn on_redraw(&self) {
+        self.drawing_area.queue_draw();
+    }
+
+    fn on_set_scroll_region(&mut self, top: u64, bot: u64, left: u64, right: u64) {
+        self.model.set_scroll_region(top, bot, left, right);
+    }
+
+    fn on_scroll(&mut self, count: i64) {
+        self.model.scroll(count);
+    }
+
+    fn on_highlight_set(&mut self, attrs: &Vec<(Value, Value)>) {
+        let mut model_attrs = Attrs::new();
+
+        for &(ref key_val, ref val) in attrs {
+            if let &Value::String(ref key) = key_val {
+                match key.as_ref() {
+                    "foreground" => {
+                        if let &Value::Integer(Integer::U64(fg)) = val {
+                            model_attrs.foreground = Some(split_color(fg));
+                        }
+                    }
+                    "background" => {
+                        if let &Value::Integer(Integer::U64(bg)) = val {
+                            model_attrs.background = Some(split_color(bg));
+                        }
+                    }
+                    "special" => {
+                        if let &Value::Integer(Integer::U64(bg)) = val {
+                            model_attrs.special = Some(split_color(bg));
+                        }
+                    }
+                    "reverse" => model_attrs.reverse = true,
+                    "bold" => model_attrs.bold = true,
+                    "italic" => model_attrs.italic = true,
+                    "underline" => model_attrs.underline = true,
+                    "undercurl" => model_attrs.undercurl = true,
+                    attr_key => println!("unknown attribute {}", attr_key),
+                };
+            } else {
+                panic!("attr key must be string");
+            }
+        }
+
+        self.cur_attrs = Some(model_attrs);
+    }
+
+    fn on_update_bg(&mut self, bg: i64) {
+        if bg >= 0 {
+            self.bg_color = split_color(bg as u64);
+        } else {
+            self.bg_color = COLOR_BLACK;
+        }
+    }
+
+    fn on_update_fg(&mut self, fg: i64) {
+        if fg >= 0 {
+            self.fg_color = split_color(fg as u64);
+        } else {
+            self.fg_color = COLOR_WHITE;
+        }
+    }
+
+    fn on_update_sp(&mut self, sp: i64) {
+        if sp >= 0 {
+            self.sp_color = split_color(sp as u64);
+        } else {
+            self.sp_color = COLOR_RED;
+        }
+    }
+
+    fn on_mode_change(&mut self, mode: &str) {
+        match mode {
+            "normal" => self.mode = NvimMode::Normal,
+            "insert" => self.mode = NvimMode::Insert,
+            _ => self.mode = NvimMode::Other,
+        }
+    }
+
+    fn on_mouse_on(&mut self) {
+        self.mouse_enabled = true;
+    }
+
+    fn on_mouse_off(&mut self) {
+        self.mouse_enabled = false;
+    }
+}
+
+impl GuiApi for Shell {
+    fn set_font(&mut self, font_desc: &str) {
+        self.set_font_desc(font_desc);
+
+        SET.with(|settings| {
+            let mut settings = settings.borrow_mut();
+            settings.set_font_source(settings::FontSource::Rpc);
+        });
+    }
+}
+

src/ui.rs

@@ -1,27 +1,19 @@
 use std::cell::RefCell;
 use std::thread;
-use std::string::String;
 
-use cairo;
-use pangocairo as pc;
-use pango;
-use pango::FontDescription;
 use gtk;
+use gtk_sys;
 use gtk::prelude::*;
 use gtk::{ApplicationWindow, HeaderBar, DrawingArea, ToolButton, Image};
-use gtk_sys;
 use gdk::{ModifierType, Event, EventKey, EventConfigure, EventButton, EventMotion, EventType};
-use gdk_sys;
 use glib;
+
 use neovim_lib::{Neovim, NeovimApi, Value, Integer};
 
-use ui_model::{UiModel, Cell, Attrs, Color, COLOR_BLACK, COLOR_WHITE, COLOR_RED};
-use nvim::{RedrawEvents, GuiApi, ErrorReport};
 use settings;
+use shell::{Shell, NvimMode};
+use nvim::{RedrawEvents, GuiApi, ErrorReport};
 
-use input::{convert_key, keyval_to_input_string};
-
-const FONT_NAME: &'static str = "DejaVu Sans Mono 12";
 
 macro_rules! ui_thread_var {
     ($id:ident, $ty:ty, $expr:expr) => (thread_local!(pub static $id: RefCell<$ty> = {
@@ -34,74 +26,34 @@ macro_rules! ui_thread_var {
     });)
 }
 
-ui_thread_var![UI, Ui, Ui::new()];
-ui_thread_var![SET, settings::Settings, settings::Settings::new()];
+ui_thread_var!(UI, Ui, Ui::new());
+ui_thread_var!(SET, settings::Settings, settings::Settings::new());
 
-#[derive(PartialEq)]
-enum NvimMode {
-    Normal,
-    Insert,
-    Other,
-}
 
 pub struct Ui {
-    pub model: UiModel,
     pub initialized: bool,
-    nvim: Option<Neovim>,
-    drawing_area: DrawingArea,
-    window: Option<ApplicationWindow>,
+    pub window: Option<ApplicationWindow>,
     header_bar: HeaderBar,
-    cur_attrs: Option<Attrs>,
-    bg_color: Color,
-    fg_color: Color,
-    sp_color: Color,
-    line_height: Option<f64>,
-    char_width: Option<f64>,
-    resize_timer: Option<glib::SourceId>,
-    mode: NvimMode,
-    mouse_enabled: bool,
-    mouse_pressed: bool,
-    font_desc: FontDescription,
+    pub shell: Shell,
 }
 
 impl Ui {
     pub fn new() -> Ui {
         Ui {
-            model: UiModel::empty(),
-            drawing_area: DrawingArea::new(),
             window: None,
             header_bar: HeaderBar::new(),
-            nvim: None,
-            cur_attrs: None,
-            bg_color: COLOR_BLACK,
-            fg_color: COLOR_WHITE,
-            sp_color: COLOR_RED,
-            line_height: None,
-            char_width: None,
-            resize_timer: None,
-            mode: NvimMode::Normal,
-            mouse_enabled: false,
-            mouse_pressed: false,
-            font_desc: FontDescription::from_string(FONT_NAME),
             initialized: false,
+            shell: Shell::new(),
         }
     }
 
-    pub fn set_nvim(&mut self, nvim: Neovim) {
-        self.nvim = Some(nvim);
-    }
-
-    pub fn nvim(&mut self) -> &mut Neovim {
-        self.nvim.as_mut().unwrap()
-    }
-
     pub fn destroy(&self) {
         self.window.as_ref().unwrap().destroy();
     }
 
     pub fn init(&mut self, app: &gtk::Application) {
-        if self.initialized { 
-            return
+        if self.initialized {
+            return;
         }
         self.initialized = true;
 
@@ -124,119 +76,33 @@ impl Ui {
         paste_btn.connect_clicked(|_| edit_paste());
         self.header_bar.pack_start(&paste_btn);
 
-
-        self.drawing_area.set_size_request(500, 300);
-        self.drawing_area.set_hexpand(true);
-        self.drawing_area.set_vexpand(true);
-
-        self.drawing_area
-            .set_events((gdk_sys::GDK_BUTTON_RELEASE_MASK | gdk_sys::GDK_BUTTON_PRESS_MASK |
-                         gdk_sys::GDK_BUTTON_MOTION_MASK)
-                .bits() as i32);
-        self.drawing_area.connect_button_press_event(gtk_button_press);
-        self.drawing_area.connect_button_release_event(gtk_button_release);
-        self.drawing_area.connect_motion_notify_event(gtk_motion_notify);
-        self.drawing_area.connect_draw(gtk_draw);
+        self.shell.init();
 
         self.window = Some(ApplicationWindow::new(app));
         let window = self.window.as_ref().unwrap();
 
         window.set_titlebar(Some(&self.header_bar));
-        window.add(&self.drawing_area);
+        window.add(&self.shell.drawing_area);
         window.show_all();
-        window.connect_key_press_event(gtk_key_press);
         window.connect_delete_event(gtk_delete);
         window.set_title("Neovim-gtk");
-        self.drawing_area.connect_configure_event(gtk_configure_event);
+
+        self.shell.add_configure_event();
     }
 
-    fn create_pango_font(&self) -> FontDescription {
-        self.font_desc.clone()
-    }
-
-    pub fn set_font_desc(&mut self, desc: &str) {
-        self.font_desc = FontDescription::from_string(desc);
-    }
-
-    fn colors<'a>(&'a self, cell: &'a Cell) -> (&'a Color, &'a Color) {
-        let bg = if let Some(ref bg) = cell.attrs.background {
-            bg
-        } else {
-            &self.bg_color
-        };
-        let fg = if let Some(ref fg) = cell.attrs.foreground {
-            fg
-        } else {
-            &self.fg_color
-        };
-
-        if cell.attrs.reverse {
-            (fg, bg)
-        } else {
-            (bg, fg)
-        }
-    }
-}
-
-fn gtk_button_press(_: &DrawingArea, ev: &EventButton) -> Inhibit {
-    if ev.get_event_type() != EventType::ButtonPress {
-        return Inhibit(false);
-    }
-
-    UI.with(|ui_cell| {
-        let mut ui = ui_cell.borrow_mut();
-        if !ui.mouse_enabled {
-            return;
-        }
-
-        mouse_input(&mut *ui, "LeftMouse", ev.get_state(), ev.get_position());
-    });
-    Inhibit(false)
-}
-
-fn mouse_input(ui: &mut Ui, input: &str, state: ModifierType, position: (f64, f64)) {
-    if let Some(line_height) = ui.line_height {
-        if let Some(char_width) = ui.char_width {
-            ui.mouse_pressed = true;
-
-            let nvim = ui.nvim();
-            let (x, y) = position;
-            let col = (x / char_width).trunc() as u64;
-            let row = (y / line_height).trunc() as u64;
-            let input_str = format!("{}<{},{}>", keyval_to_input_string(input, state), col, row);
-            nvim.input(&input_str).expect("Can't send mouse input event");
-        }
-    }
-}
-
-fn gtk_button_release(_: &DrawingArea, _: &EventButton) -> Inhibit {
-    UI.with(|ui_cell| ui_cell.borrow_mut().mouse_pressed = false);
-    Inhibit(false)
-}
-
-fn gtk_motion_notify(_: &DrawingArea, ev: &EventMotion) -> Inhibit {
-    UI.with(|ui_cell| {
-        let mut ui = ui_cell.borrow_mut();
-        if !ui.mouse_enabled || !ui.mouse_pressed {
-            return;
-        }
-
-        mouse_input(&mut *ui, "LeftDrag", ev.get_state(), ev.get_position());
-    });
-    Inhibit(false)
 }
 
 fn edit_paste() {
     UI.with(|ui_cell| {
         let mut ui = ui_cell.borrow_mut();
 
-        let paste_command = if ui.mode == NvimMode::Normal {
+        let paste_command = if ui.shell.mode == NvimMode::Normal {
             "\"*p"
         } else {
             "<Esc>\"*pa"
         };
 
-        let mut nvim = ui.nvim();
+        let mut nvim = ui.shell.nvim();
         nvim.input(paste_command).report_err(nvim);
     });
 }
@@ -245,7 +111,7 @@ fn edit_save_all() {
     UI.with(|ui_cell| {
         let mut ui = ui_cell.borrow_mut();
 
-        let mut nvim = ui.nvim();
+        let mut nvim = ui.shell.nvim();
         nvim.command(":wa").report_err(nvim);
     });
 }
@@ -266,382 +132,3 @@ fn gtk_delete(_: &ApplicationWindow, _: &Event) -> Inhibit {
     Inhibit(false)
 }
 
-fn gtk_key_press(_: &ApplicationWindow, ev: &EventKey) -> Inhibit {
-    if let Some(input) = convert_key(ev) {
-        UI.with(|ui_cell| {
-            let mut ui = ui_cell.borrow_mut();
-            ui.nvim().input(&input).expect("Error run input command to nvim");
-        });
-        Inhibit(true)
-    } else {
-        Inhibit(false)
-    }
-}
-
-fn gtk_draw(_: &DrawingArea, ctx: &cairo::Context) -> Inhibit {
-    UI.with(|ui_cell| {
-        let mut ui = ui_cell.borrow_mut();
-
-        let (width, height) = calc_char_bounds(&*ui, ctx);
-        ui.line_height = Some(height as f64);
-        ui.char_width = Some(width as f64);
-
-        draw(&*ui, ctx);
-        request_width(&*ui);
-    });
-
-    Inhibit(false)
-}
-
-fn gtk_configure_event(_: &DrawingArea, ev: &EventConfigure) -> bool {
-    UI.with(|ui_cell| {
-        let mut ui = ui_cell.borrow_mut();
-        let (width, height) = ev.get_size();
-
-        if let Some(timer) = ui.resize_timer {
-            glib::source_remove(timer);
-        }
-        if let Some(line_height) = ui.line_height {
-            if let Some(char_width) = ui.char_width {
-
-                ui.resize_timer = Some(glib::timeout_add(250, move || {
-                    UI.with(|ui_cell| {
-                        let mut ui = ui_cell.borrow_mut();
-                        ui.resize_timer = None;
-
-                        let rows = (height as f64 / line_height).trunc() as usize;
-                        let columns = (width as f64 / char_width).trunc() as usize;
-                        if ui.model.rows != rows || ui.model.columns != columns {
-                            if let Err(err) = ui.nvim().ui_try_resize(columns as u64, rows as u64) {
-                                println!("Error trying resize nvim {}", err);
-                            }
-                        }
-                    });
-                    Continue(false)
-                }));
-            }
-        }
-    });
-    false
-}
-
-#[inline]
-fn draw_joined_rect(ui: &Ui,
-                    ctx: &cairo::Context,
-                    from_col_idx: usize,
-                    col_idx: usize,
-                    char_width: f64,
-                    line_height: f64,
-                    color: &Color) {
-    let current_point = ctx.get_current_point();
-    let rect_width = char_width * (col_idx - from_col_idx) as f64;
-
-    if &ui.bg_color != color {
-        ctx.set_source_rgb(color.0, color.1, color.2);
-        ctx.rectangle(current_point.0, current_point.1, rect_width, line_height);
-        ctx.fill();
-    }
-
-    ctx.move_to(current_point.0 + rect_width, current_point.1);
-}
-
-fn draw(ui: &Ui, ctx: &cairo::Context) {
-    ctx.set_source_rgb(ui.bg_color.0, ui.bg_color.1, ui.bg_color.2);
-    ctx.paint();
-
-    let line_height = ui.line_height.unwrap();
-    let char_width = ui.char_width.unwrap();
-    let (row, col) = ui.model.get_cursor();
-    let mut buf = String::with_capacity(4);
-
-    let mut line_y: f64 = 0.0;
-
-
-    let layout = pc::create_layout(ctx);
-    let mut desc = ui.create_pango_font();
-
-    for (line_idx, line) in ui.model.model().iter().enumerate() {
-        ctx.move_to(0.0, line_y);
-
-        // first draw background
-        // here we join same bg color for given line
-        // this gives less drawing primitives
-        let mut from_col_idx = 0;
-        let mut from_bg = None;
-        for (col_idx, cell) in line.iter().enumerate() {
-            let (bg, _) = ui.colors(cell);
-
-            if from_bg.is_none() {
-                from_bg = Some(bg);
-                from_col_idx = col_idx;
-            } else if from_bg != Some(bg) {
-                draw_joined_rect(ui,
-                                 ctx,
-                                 from_col_idx,
-                                 col_idx,
-                                 char_width,
-                                 line_height,
-                                 from_bg.take().unwrap());
-                from_bg = Some(bg);
-                from_col_idx = col_idx;
-            }
-        }
-        draw_joined_rect(ui,
-                         ctx,
-                         from_col_idx,
-                         line.len(),
-                         char_width,
-                         line_height,
-                         from_bg.take().unwrap());
-
-        ctx.move_to(0.0, line_y);
-
-        for (col_idx, cell) in line.iter().enumerate() {
-            let double_width = line.get(col_idx + 1).map(|c| c.attrs.double_width).unwrap_or(false);
-            let current_point = ctx.get_current_point();
-
-            let (bg, fg) = ui.colors(cell);
-
-            if row == line_idx && col == col_idx {
-                ctx.set_source_rgba(1.0 - bg.0, 1.0 - bg.1, 1.0 - bg.2, 0.5);
-
-                let cursor_width = if ui.mode == NvimMode::Insert {
-                    char_width / 5.0
-                } else {
-                    if double_width {
-                        char_width * 2.0
-                    } else {
-                        char_width
-                    }
-                };
-
-                ctx.rectangle(current_point.0, line_y, cursor_width, line_height);
-                ctx.fill();
-                ctx.move_to(current_point.0, current_point.1);
-            }
-
-
-            if !cell.ch.is_whitespace() {
-                update_font_description(&mut desc, &cell.attrs);
-
-                layout.set_font_description(Some(&desc));
-                buf.clear();
-                buf.push(cell.ch);
-                layout.set_text(&buf, -1);
-
-                // correct layout for double_width chars
-                if double_width {
-                    let (dw_width, dw_height) = layout.get_pixel_size();
-                    let x_offset = (char_width * 2.0 - dw_width as f64) / 2.0;
-                    let y_offset = (line_height - dw_height as f64) / 2.0;
-                    ctx.rel_move_to(x_offset, y_offset);
-                }
-
-                ctx.set_source_rgb(fg.0, fg.1, fg.2);
-                pc::update_layout(ctx, &layout);
-                pc::show_layout(ctx, &layout);
-            }
-
-            if cell.attrs.underline || cell.attrs.undercurl {
-                // [TODO]: Current gtk-rs bindings does not provide fontmetrics access
-                // so it is not possible to find right position for underline or undercurl position
-                // > update_font_description(&mut desc, &cell.attrs);
-                // > layout.get_context().unwrap().get_metrics();
-                let top_offset = line_height * 0.9;
-
-                let sp = if let Some(ref sp) = cell.attrs.special {
-                    sp
-                } else {
-                    &ui.sp_color
-                };
-
-                ctx.set_source_rgba(sp.0, sp.1, sp.2, 0.7);
-                if cell.attrs.undercurl {
-                    ctx.set_dash(&[4.0, 2.0], 0.0);
-                    ctx.set_line_width(2.0);
-                    ctx.move_to(current_point.0, line_y + top_offset);
-                    ctx.line_to(current_point.0 + char_width, line_y + top_offset);
-                    ctx.stroke();
-                    ctx.set_dash(&[], 0.0);
-                } else if cell.attrs.underline {
-                    ctx.set_line_width(1.0);
-                    ctx.move_to(current_point.0, line_y + top_offset);
-                    ctx.line_to(current_point.0 + char_width, line_y + top_offset);
-                    ctx.stroke();
-                }
-            }
-
-            ctx.move_to(current_point.0 + char_width, current_point.1);
-        }
-
-        line_y += line_height;
-    }
-}
-
-#[inline]
-fn update_font_description(desc: &mut FontDescription, attrs: &Attrs) {
-    desc.unset_fields(pango::FONT_MASK_STYLE | pango::FONT_MASK_WEIGHT);
-    if attrs.italic {
-        desc.set_style(pango::Style::Italic);
-    }
-    if attrs.bold {
-        desc.set_weight(pango::Weight::Bold);
-    }
-}
-
-fn calc_char_bounds(ui: &Ui, ctx: &cairo::Context) -> (i32, i32) {
-    let layout = pc::create_layout(ctx);
-
-    let desc = ui.create_pango_font();
-    layout.set_font_description(Some(&desc));
-    layout.set_text("A", -1);
-
-    layout.get_pixel_size()
-}
-
-fn request_width(ui: &Ui) {
-    if ui.resize_timer.is_some() {
-        return;
-    }
-
-    let width = ui.drawing_area.get_allocated_width();
-    let height = ui.drawing_area.get_allocated_height();
-    let request_height = (ui.model.rows as f64 * ui.line_height.unwrap()) as i32;
-    let request_width = (ui.model.columns as f64 * ui.char_width.unwrap()) as i32;
-
-    if width != request_width || height != request_height {
-        let window = ui.window.as_ref().unwrap();
-        let (win_width, win_height) = window.get_size();
-        let h_border = win_width - width;
-        let v_border = win_height - height;
-        window.resize(request_width + h_border, request_height + v_border);
-    }
-}
-
-impl GuiApi for Ui {
-    fn set_font(&mut self, font_desc: &str) {
-        self.set_font_desc(font_desc);
-
-        SET.with(|settings| {
-            let mut settings = settings.borrow_mut();
-            settings.set_font_source(settings::FontSource::Rpc);
-        });
-    }
-}
-
-impl RedrawEvents for Ui {
-    fn on_cursor_goto(&mut self, row: u64, col: u64) {
-        self.model.set_cursor(row, col);
-    }
-
-    fn on_put(&mut self, text: &str) {
-        self.model.put(text, self.cur_attrs.as_ref());
-    }
-
-    fn on_clear(&mut self) {
-        self.model.clear();
-    }
-
-    fn on_eol_clear(&mut self) {
-        self.model.eol_clear();
-    }
-
-    fn on_resize(&mut self, columns: u64, rows: u64) {
-        self.model = UiModel::new(rows, columns);
-    }
-
-    fn on_redraw(&self) {
-        self.drawing_area.queue_draw();
-    }
-
-    fn on_set_scroll_region(&mut self, top: u64, bot: u64, left: u64, right: u64) {
-        self.model.set_scroll_region(top, bot, left, right);
-    }
-
-    fn on_scroll(&mut self, count: i64) {
-        self.model.scroll(count);
-    }
-
-    fn on_highlight_set(&mut self, attrs: &Vec<(Value, Value)>) {
-        let mut model_attrs = Attrs::new();
-
-        for &(ref key_val, ref val) in attrs {
-            if let &Value::String(ref key) = key_val {
-                match key.as_ref() {
-                    "foreground" => {
-                        if let &Value::Integer(Integer::U64(fg)) = val {
-                            model_attrs.foreground = Some(split_color(fg));
-                        }
-                    }
-                    "background" => {
-                        if let &Value::Integer(Integer::U64(bg)) = val {
-                            model_attrs.background = Some(split_color(bg));
-                        }
-                    }
-                    "special" => {
-                        if let &Value::Integer(Integer::U64(bg)) = val {
-                            model_attrs.special = Some(split_color(bg));
-                        }
-                    }
-                    "reverse" => model_attrs.reverse = true,
-                    "bold" => model_attrs.bold = true,
-                    "italic" => model_attrs.italic = true,
-                    "underline" => model_attrs.underline = true,
-                    "undercurl" => model_attrs.undercurl = true,
-                    attr_key => println!("unknown attribute {}", attr_key),
-                };
-            } else {
-                panic!("attr key must be string");
-            }
-        }
-
-        self.cur_attrs = Some(model_attrs);
-    }
-
-    fn on_update_bg(&mut self, bg: i64) {
-        if bg >= 0 {
-            self.bg_color = split_color(bg as u64);
-        } else {
-            self.bg_color = COLOR_BLACK;
-        }
-    }
-
-    fn on_update_fg(&mut self, fg: i64) {
-        if fg >= 0 {
-            self.fg_color = split_color(fg as u64);
-        } else {
-            self.fg_color = COLOR_WHITE;
-        }
-    }
-
-    fn on_update_sp(&mut self, sp: i64) {
-        if sp >= 0 {
-            self.sp_color = split_color(sp as u64);
-        } else {
-            self.sp_color = COLOR_RED;
-        }
-    }
-
-    fn on_mode_change(&mut self, mode: &str) {
-        match mode {
-            "normal" => self.mode = NvimMode::Normal,
-            "insert" => self.mode = NvimMode::Insert,
-            _ => self.mode = NvimMode::Other,
-        }
-    }
-
-    fn on_mouse_on(&mut self) {
-        self.mouse_enabled = true;
-    }
-
-    fn on_mouse_off(&mut self) {
-        self.mouse_enabled = false;
-    }
-}
-
-fn split_color(indexed_color: u64) -> Color {
-    let r = ((indexed_color >> 16) & 0xff) as f64;
-    let g = ((indexed_color >> 8) & 0xff) as f64;
-    let b = (indexed_color & 0xff) as f64;
-    Color(r / 255.0, g / 255.0, b / 255.0)
-}