ansi parser: PtyView to display cursor & scrolling

nested/src/terminal/ansi_parser.rs

@@ -8,30 +8,45 @@ use {
     std::io::Read,
     //async_std::{io::{Read, ReadExt}},
     crate::{
-        core::{InnerViewPort, OuterViewPort},
+        core::{View, InnerViewPort, OuterViewPort, ViewPort, Observer, ObserverBroadcast},
+        projection::ProjectionHelper,
         terminal::{
             TerminalAtom,
             TerminalStyle,
             TerminalView
         },
-        index::buffer::IndexBuffer
+        singleton::{
+            SingletonBuffer,
+            SingletonView
         },
-    cgmath::Point2,
+        index::{
+            buffer::IndexBuffer,
+            IndexView,
+            IndexArea
+        }
+    },
+    cgmath::{Vector2, Point2},
     vte::{Params, Parser, Perform}
 };
 
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
+
 pub fn read_ansi_from<R: Read + Unpin>(ansi_reader: &mut R, port: InnerViewPort<dyn TerminalView>) {
     let mut statemachine = Parser::new();
 
+    let buf_port = ViewPort::new();
+    let size_port = ViewPort::<dyn SingletonView<Item = Vector2<i16>>>::new();
+    let cursor_port = ViewPort::<dyn SingletonView<Item = Point2<i16>>>::new();
+    let offset_port = ViewPort::<dyn SingletonView<Item = Vector2<i16>>>::new();
+
     let mut performer = PerfAtom {
-        cursor: Point2::new(0, 0),
+        buf: IndexBuffer::new(buf_port.inner()),
-        style: TerminalStyle::default(),
+        size: SingletonBuffer::new(Vector2::new(120, 40), size_port.inner()),
-        invert: false,
+        offset: SingletonBuffer::new(Vector2::new(0, 0), offset_port.inner()),
-        term_width: 120,
+        cursor: SingletonBuffer::new(Point2::new(0, 0), cursor_port.inner()),
-
+        cursty: TerminalStyle::default(),
-        cursor_save: Point2::new(0, 0),
+        curinv: false,
-
+        cursav: Point2::new(0, 0),
-        buf: IndexBuffer::new(port),
 
         colors: ColorPalett {
             black: (1, 1, 1),
@@ -42,7 +57,16 @@ pub fn read_ansi_from<R: Read + Unpin>(ansi_reader: &mut R, port: InnerViewPort<
             magenta: (118, 38, 113),
             cyan: (44, 181, 233),
             white: (204, 204, 204)
-        }
+        },
+
+        pty_proj: PtyView::new(
+            buf_port.outer(),
+            cursor_port.outer().map(|x| Some(x)),
+            offset_port.outer().map(|x| Some(x)),
+            size_port.outer().map(|x| Some(x)),
+
+            port
+        )
     };
 
     let mut buf = [0; 2048];
@@ -63,6 +87,22 @@ pub fn read_ansi_from<R: Read + Unpin>(ansi_reader: &mut R, port: InnerViewPort<
     }
 }
 
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
+
+enum TTYColor {
+    Rgb(u8, u8, u8),
+
+    // 3-Bit/4-Bit colors
+    Black,  LightBlack,
+    Red,    LightRed,
+    Green,  LightGreen,
+    Yellow, LightYellow,
+    Blue,   LightBlue,
+    Magenta,LightMagenta,
+    Cyan,   LightCyan,
+    White,  LightWhite,
+}
+
 struct ColorPalett {
     black: (u8, u8, u8),
     red: (u8, u8, u8),
@@ -71,84 +111,279 @@ struct ColorPalett {
     blue: (u8, u8, u8),
     magenta: (u8, u8, u8),
     cyan: (u8, u8, u8),
-    white: (u8, u8, u8)
+    white: (u8, u8, u8),
 }
 
+impl ColorPalett {
+    fn get_rgb(&self, col: &TTYColor) -> (u8, u8, u8) {
+        match col {
+            TTYColor::Rgb(r,g,b) => (*r,*g,*b),
+            TTYColor::Black | TTYColor::LightBlack => self.black,
+            TTYColor::Red | TTYColor::LightRed => self.red,
+            TTYColor::Green | TTYColor::LightGreen => self.green,
+            TTYColor::Yellow | TTYColor::LightYellow => self.yellow,
+            TTYColor::Blue | TTYColor::LightBlue => self.blue,
+            TTYColor::Magenta | TTYColor::LightMagenta => self.magenta,
+            TTYColor::Cyan | TTYColor::LightCyan => self.cyan,
+            TTYColor::White | TTYColor::LightWhite => self.white,
+        }
+    }
+}
+
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
+
+/// Display Cursor & scrolling
+struct PtyView {
+    buf: Arc<dyn IndexView<Point2<i16>, Item = TerminalAtom>>,
+    curpos: Arc<dyn SingletonView<Item = Option<Point2<i16>>>>,
+    offset: Arc<dyn SingletonView<Item = Option<Vector2<i16>>>>,
+    size: Arc<dyn SingletonView<Item = Option<Vector2<i16>>>>,
+
+    old_offset: Vector2<i16>,
+    old_curpos: Point2<i16>,
+    old_size: Vector2<i16>,
+
+    max_pt: Point2<i16>,
+
+    cast: Arc<RwLock<ObserverBroadcast<dyn TerminalView>>>,
+    proj_helper: ProjectionHelper<usize, Self>
+}
+
+impl View for PtyView {
+    type Msg = IndexArea<Point2<i16>>;
+}
+
+impl IndexView<Point2<i16>> for PtyView {
+    type Item = TerminalAtom;
+
+    fn get(&self, pt: &Point2<i16>) -> Option<TerminalAtom> {
+        let atom = self.buf.get(&(pt + self.old_offset));
+        if self.old_curpos == *pt {
+            if let Some(mut a) = atom {
+                let bg_col = a.style.fg_color.unwrap_or((255,255,255));
+                let fg_col = a.style.bg_color.unwrap_or((0,0,0));
+                a.style.fg_color = Some(fg_col);
+                a.style.bg_color = Some(bg_col);
+                Some(a)
+            } else {
+                Some(TerminalAtom::new(' ', TerminalStyle::bg_color((255, 255, 255))))
+            }
+        } else {
+            atom
+        }
+    }
+
+    fn area(&self) -> IndexArea<Point2<i16>> {        
+        IndexArea::Range(Point2::new(0, 0) ..= Point2::new(
+            std::cmp::max(self.old_curpos.x, self.max_pt.x),
+            std::cmp::max(self.old_curpos.y, self.max_pt.y)
+        ))
+    }
+}
+
+impl PtyView {
+    fn new(
+        buf_port: OuterViewPort<dyn IndexView<Point2<i16>, Item = TerminalAtom>>,
+        curpos_port: OuterViewPort<dyn SingletonView<Item = Option<Point2<i16>>>>,
+        offset_port: OuterViewPort<dyn SingletonView<Item = Option<Vector2<i16>>>>,
+        size_port: OuterViewPort<dyn SingletonView<Item = Option<Vector2<i16>>>>,
+
+        out_port: InnerViewPort<dyn TerminalView>
+    ) -> Arc<RwLock<Self>> {
+        let mut proj_helper = ProjectionHelper::new(out_port.0.update_hooks.clone());
+        let proj = Arc::new(RwLock::new(
+                PtyView {
+                    old_curpos: Point2::new(0, 0),
+                    old_size: Vector2::new(0, 0),
+                    old_offset: Vector2::new(0, 0),
+                    max_pt: Point2::new(0, 0),
+
+                    curpos: proj_helper.new_singleton_arg(
+                        0,
+                        curpos_port,
+                        |s: &mut Self, _msg| {
+                            s.cast.notify(&IndexArea::Set(vec![ s.old_curpos ]));
+                            s.old_curpos = s.curpos.get().unwrap_or(Point2::new(0,0));
+                            s.cast.notify(&IndexArea::Set(vec![ s.old_curpos ]));
+                        }),
+
+                    offset: proj_helper.new_singleton_arg(
+                        1,
+                        offset_port,
+                        |s: &mut Self, _msg| {
+                            // todo
+                            let new_offset = s.offset.get().unwrap_or(Vector2::new(0, 0));
+                            if s.old_offset != new_offset {
+                                s.old_offset = new_offset;
+                                s.cast.notify(&s.area());
+                            }
+                        }),
+
+                    size: proj_helper.new_singleton_arg(
+                        2,
+                        size_port,
+                        |s: &mut Self, _msg| {
+                            let new_size = s.size.get().unwrap_or(Vector2::new(0, 0));
+                            if s.old_size != new_size {
+                                s.old_size = new_size;
+                                s.cast.notify(&s.area());
+                            }
+                        }),
+
+                    buf: proj_helper.new_index_arg(
+                        3,
+                        buf_port,
+                        |s: &mut Self, area| {
+                            let size = s.old_size;
+                            let area = area.map(
+                                |pt| {
+                                    *pt - s.old_offset
+                                }
+                            );
+
+                            if s.max_pt.x < size.x || s.max_pt.y < size.y {
+                                match &area {
+                                    IndexArea::Empty => {}
+                                    IndexArea::Full => {}
+                                    IndexArea::Range(_) => {}
+                                    IndexArea::Set(v) => {
+                                        let mx = v.iter().map(|pt| pt.x).max().unwrap_or(0);
+                                        if mx > s.max_pt.x && mx < size.x {
+                                            s.max_pt.x = mx;
+                                        }
+
+                                        let my = v.iter().map(|pt| pt.y).max().unwrap_or(0);
+                                        if my > s.max_pt.y && my < size.y {
+                                            s.max_pt.y = my;
+                                        }
+                                    }
+                                }
+                            }
+
+                            s.cast.notify(&area);
+                        }),
+
+                    cast: out_port.get_broadcast(),
+                    proj_helper
+                }
+            ));
+
+        proj.write().unwrap().proj_helper.set_proj(&proj);
+        out_port.set_view(Some(proj.clone()));
+
+        proj        
+    }
+}
+
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
+
 struct PerfAtom {
-    colors: ColorPalett,
-    term_width: i16,
-
-    cursor: Point2<i16>,
-    style: TerminalStyle,
-    invert: bool,
-    cursor_save: Point2<i16>,
-
     buf: IndexBuffer<Point2<i16>, TerminalAtom>,
+    size: SingletonBuffer<Vector2<i16>>,
+    offset: SingletonBuffer<Vector2<i16>>,
+    cursor: SingletonBuffer<Point2<i16>>,
+    cursty: TerminalStyle,
+    curinv: bool,
+    cursav: Point2<i16>,
+
+    colors: ColorPalett,
+
+    pty_proj: Arc<RwLock<PtyView>>
 }
 
 impl PerfAtom {
     fn write_atom(&mut self, pos: Point2<i16>, atom: Option<TerminalAtom>) {
         if let Some(mut a) = atom {
-            self.buf.insert(pos, a);
+            self.buf.insert(pos + self.offset.get(), a);
         } else {
             self.buf.remove(pos);
         }
     }
 
     fn get_style(&self) -> TerminalStyle {
-        let mut style = self.style;
+        let mut style = self.cursty;
-        if self.invert {
+        if self.curinv {
-            style.fg_color = Some(self.style.bg_color.unwrap_or(self.colors.black));
+            style.fg_color = Some(self.cursty.bg_color.unwrap_or(self.colors.black));
-            style.bg_color = Some(self.style.fg_color.unwrap_or(self.colors.white));
+            style.bg_color = Some(self.cursty.fg_color.unwrap_or(self.colors.white));
         }
         style
     }
 
+    fn set_fg_color(&mut self, col: &TTYColor) {
+        self.cursty = self.cursty.add(TerminalStyle::fg_color(self.colors.get_rgb(col)));
+    }
+
+    fn set_bg_color(&mut self, col: &TTYColor) {
+        self.cursty = self.cursty.add(TerminalStyle::bg_color(self.colors.get_rgb(col)));
+    }
+
     fn linefeed(&mut self) {
-        self.cursor.x = 0;
+        let size = self.size.get();
-        self.cursor.y += 1;        
+        let mut c = self.cursor.get_mut();
+        c.x = 0;
+
+        if c.y+1 >= size.y {
+            self.scroll_up(1);
+        } else {
+            c.y += 1;
+        }
     }
 
     fn carriage_return(&mut self) {
-        self.cursor.x = 0;        
+        let mut c = self.cursor.get_mut();
+        c.x = 0;        
     }
 
     fn horizontal_tab(&mut self) {
-        self.cursor.x += 8 - (self.cursor.x % 8);
+        let mut c = self.cursor.get_mut();
+        c.x += 8 - (c.x % 8);
     }
 
     fn backspace(&mut self) {
-        self.write_atom(self.cursor, None);
+        //self.write_atom(self.cursor.get(), None);
-        self.cursor.x -= 1;
+        let mut c = self.cursor.get_mut();
-        if self.cursor.x < 0 {
+        c.x -= 1;
-            self.cursor.y -= 0;
+        if c.x < 0 {
-            self.cursor.x = self.term_width - 1;
+            c.y -= 0;
+            c.x = self.size.get().x - 1;
         }
     }
 
     fn cursor_up(&mut self, n: usize) {
+        self.cursor.get_mut().y -= n as i16;
     }
 
-    fn cursor_down(&mut self, n: usize) {        
+    fn cursor_dn(&mut self, n: usize) {
+        self.cursor.get_mut().y += n as i16;
+
+        // todo: scroll ?
+    }
+
+    fn scroll_up(&mut self, n: usize) {
+        self.offset.get_mut().y += n as i16;
+    }
+
+    fn scroll_dn(&mut self, n: usize) {
+        self.offset.get_mut().y -= n as i16;
     }
 
     fn save_cursor_position(&mut self) {
-        self.cursor_save = self.cursor;
+        self.cursav = self.cursor.get();
     }
 
     fn restore_cursor_position(&mut self) {
-        self.cursor = self.cursor_save;
+        self.cursor.set(self.cursav);
     }
 }
 
 impl Perform for PerfAtom {
-    fn print(&mut self, c: char) {
+    fn print(&mut self, ch: char) {
-        self.write_atom(self.cursor, Some(TerminalAtom::new(c, self.get_style())));
+        let mut c = self.cursor.get_mut();
+        self.write_atom(*c, Some(TerminalAtom::new(ch, self.get_style())));
 
-        self.cursor.x += 1;
+        c.x += 1;
-        if self.cursor.x >= self.term_width {
+        if c.x >= self.size.get().x {
-            self.cursor.x = 0;
+            self.linefeed();
-            self.cursor.y += 1;
         }
     }
 
@@ -192,44 +427,61 @@ impl Perform for PerfAtom {
             'm' =>  while let Some(n) = piter.next() {
                 match n[0] {
                     0 => {
-                        self.style = TerminalStyle::default();
+                        self.cursty = TerminalStyle::default();
-                        self.invert = false;
+                        self.curinv = false;
                     }
-                    1 => self.style = self.style.add(TerminalStyle::bold(true)),
+                    1 => self.cursty = self.cursty.add(TerminalStyle::bold(true)),
-                    3 => self.style = self.style.add(TerminalStyle::italic(true)),
+                    3 => self.cursty = self.cursty.add(TerminalStyle::italic(true)),
-                    4 => self.style = self.style.add(TerminalStyle::underline(true)),
+                    4 => self.cursty = self.cursty.add(TerminalStyle::underline(true)),
-                    7 => self.invert = true,
+                    7 => self.curinv = true,
-                    27 => self.invert = false,
+                    27 => self.curinv = false,
 
-                    30 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.black)),
+                    30 => self.set_fg_color(&TTYColor::Black),
-                    40 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.black)),
+                    40 => self.set_bg_color(&TTYColor::Black),
-                    31 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.red)),
+                    90 => self.set_fg_color(&TTYColor::LightBlack),
-                    41 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.red)),
+                    100 => self.set_bg_color(&TTYColor::LightBlack),
-                    32 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.green)),
+                    31 => self.set_fg_color(&TTYColor::Red),
-                    42 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.green)),
+                    41 => self.set_bg_color(&TTYColor::Red),
-                    33 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.yellow)),
+                    91 => self.set_fg_color(&TTYColor::LightRed),
-                    43 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.yellow)),
+                    101 => self.set_bg_color(&TTYColor::LightRed),
-                    34 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.blue)),
+                    32 => self.set_fg_color(&TTYColor::Green),
-                    44 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.blue)),
+                    42 => self.set_bg_color(&TTYColor::Green),
-                    35 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.magenta)),
+                    92 => self.set_fg_color(&TTYColor::LightGreen),
-                    45 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.magenta)),
+                    102 => self.set_bg_color(&TTYColor::LightGreen),
-                    36 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.cyan)),
+                    33 => self.set_fg_color(&TTYColor::Yellow),
-                    46 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.cyan)),
+                    43 => self.set_bg_color(&TTYColor::Yellow),
-                    37 => self.style = self.style.add(TerminalStyle::fg_color(self.colors.white)),
+                    93 => self.set_fg_color(&TTYColor::LightYellow),
-                    47 => self.style = self.style.add(TerminalStyle::bg_color(self.colors.white)),
+                    103 => self.set_bg_color(&TTYColor::LightYellow),
+                    34 => self.set_fg_color(&TTYColor::Blue),
+                    44 => self.set_bg_color(&TTYColor::Blue),
+                    94 => self.set_fg_color(&TTYColor::LightBlue),
+                    104 => self.set_bg_color(&TTYColor::LightBlue),
+                    35 => self.set_fg_color(&TTYColor::Magenta),
+                    45 => self.set_bg_color(&TTYColor::Magenta),
+                    95 => self.set_fg_color(&TTYColor::LightMagenta),
+                    105 => self.set_bg_color(&TTYColor::LightMagenta),
+                    36 => self.set_fg_color(&TTYColor::Cyan),
+                    46 => self.set_bg_color(&TTYColor::Cyan),
+                    96 => self.set_fg_color(&TTYColor::LightCyan),
+                    106 => self.set_bg_color(&TTYColor::LightCyan),
+                    37 => self.set_fg_color(&TTYColor::White),
+                    47 => self.set_bg_color(&TTYColor::White),
+                    97 => self.set_fg_color(&TTYColor::LightWhite),
+                    107 => self.set_bg_color(&TTYColor::LightWhite),
 
                     38 => {
                         let x = piter.next().unwrap();
                         match x[0] {
                             2 => {
-                                let r = piter.next().unwrap();
+                                let r = piter.next().unwrap()[0] as u8;
-                                let g = piter.next().unwrap();
+                                let g = piter.next().unwrap()[0] as u8;
-                                let b = piter.next().unwrap();
+                                let b = piter.next().unwrap()[0] as u8;
-                                self.style = self.style.add(TerminalStyle::fg_color((r[0] as u8, g[0] as u8, b[0] as u8)))
+                                self.set_fg_color(&TTYColor::Rgb(r,g,b));
                             },
                             5 => {
                                 let v = piter.next().unwrap();
-                                self.style = self.style.add(TerminalStyle::fg_color(ansi_colours::rgb_from_ansi256(v[0] as u8)))
+                                let rgb = ansi_colours::rgb_from_ansi256(v[0] as u8);
+                                self.set_fg_color(&TTYColor::Rgb(rgb.0, rgb.1, rgb.2));
                             },
                             _ => {}
                         }
@@ -238,14 +490,15 @@ impl Perform for PerfAtom {
                         let x = piter.next().unwrap();
                         match x[0] {
                             2 => {
-                                let r = piter.next().unwrap();
+                                let r = piter.next().unwrap()[0] as u8;
-                                let g = piter.next().unwrap();
+                                let g = piter.next().unwrap()[0] as u8;
-                                let b = piter.next().unwrap();
+                                let b = piter.next().unwrap()[0] as u8;
-                                self.style = self.style.add(TerminalStyle::bg_color((r[0] as u8, g[0] as u8, b[0] as u8)))
+                                self.set_bg_color(&TTYColor::Rgb(r,g,b));
                             },
                             5 => {
                                 let v = piter.next().unwrap();
-                                self.style = self.style.add(TerminalStyle::bg_color(ansi_colours::rgb_from_ansi256(v[0] as u8)))
+                                let rgb = ansi_colours::rgb_from_ansi256(v[0] as u8);
+                                self.set_bg_color(&TTYColor::Rgb(rgb.0, rgb.1, rgb.2));
                             },
                             _ => {}
                         }
@@ -255,53 +508,52 @@ impl Perform for PerfAtom {
                 }
             }
             '@' => {
-                for x in self.cursor.x .. self.term_width {
+                let c = self.cursor.get();
-                    self.write_atom(Point2::new(x, self.cursor.y), Some(TerminalAtom::new(' ', self.style)));
+                for x in c.x .. self.size.get().x {
-                }
+                    self.write_atom(Point2::new(x, c.y), Some(TerminalAtom::new(' ', self.cursty)));
-            }
-            'A' => {
-                self.cursor.y -= piter.next().unwrap_or(&[1])[0] as i16;
-            }
-            'B' => {
-                self.cursor.y += piter.next().unwrap_or(&[1])[0] as i16;
-                if self.cursor.x >= self.term_width {
-                    self.cursor.x = 0;
                 }
             }
+            'A' => { self.cursor_up(piter.next().unwrap_or(&[1])[0] as usize); }
+            'B' => { self.cursor_dn(piter.next().unwrap_or(&[1])[0] as usize); }
             'C' | 'a' => {
-                self.cursor.x += piter.next().unwrap_or(&[1])[0] as i16;
+                let mut c = self.cursor.get_mut();
-                if self.cursor.x >= self.term_width {
+                c.x += piter.next().unwrap_or(&[1])[0] as i16;
-                    self.cursor.y += self.cursor.x / self.term_width;
+                if c.x >= self.size.get().x {
-                    self.cursor.x %= self.term_width;
+                    c.y += c.x / self.size.get().x;
+                    c.x %= self.size.get().x;
                 }
             }
             'D' => {
-                self.cursor.x -= piter.next().unwrap_or(&[1])[0] as i16;
+                let mut c = self.cursor.get_mut();
-                if self.cursor.x < 0 {
+                c.x -= piter.next().unwrap_or(&[1])[0] as i16;
-                    self.cursor.x = self.term_width - 1;
+                if c.x < 0 {
-                    self.cursor.y -= 1;
+                    c.x = self.size.get().x - 1;
+                    c.y -= 1;
                 }
             }
             'd' => {
-                self.cursor.y = piter.next().unwrap_or(&[1])[0] as i16 - 1;
+                self.cursor.get_mut().y = piter.next().unwrap_or(&[1])[0] as i16 - 1;
             }
             'E' => {
-                if self.cursor.x >= self.term_width {
+                let mut c = self.cursor.get_mut();
-                    self.cursor.y += 1;
+                if c.x >= self.size.get().x {
+                    c.y += 1;
                 }
-                self.cursor.x = 0;
+                c.x = 0;
-                self.cursor.y += piter.next().unwrap_or(&[1])[0] as i16;
+                c.y += piter.next().unwrap_or(&[1])[0] as i16;
             }
             'F' => {
-                self.cursor.x = 0;
+                let mut c = self.cursor.get_mut();
-                self.cursor.y -= piter.next().unwrap_or(&[1])[0] as i16;
+                c.x = 0;
+                c.y -= piter.next().unwrap_or(&[1])[0] as i16;
             }
             'G' | '`' => {
-                self.cursor.x = piter.next().unwrap_or(&[1])[0] as i16 - 1;
+                self.cursor.get_mut().x = piter.next().unwrap_or(&[1])[0] as i16 - 1;
             }
             'H' | 'f' => {
-                self.cursor.y = piter.next().unwrap_or(&[1])[0] as i16 - 1;
+                let mut c = self.cursor.get_mut();
-                self.cursor.x = piter.next().unwrap_or(&[1])[0] as i16 - 1;
+                c.y = piter.next().unwrap_or(&[1])[0] as i16 - 1;
+                c.x = piter.next().unwrap_or(&[1])[0] as i16 - 1;
             }
             'J' => {
                 let x = piter.next().unwrap_or(&[0 as u16; 1]);
@@ -309,13 +561,13 @@ impl Perform for PerfAtom {
 
                     // clear from cursor until end of screen
                     0 => {
-                        let mut pos = self.cursor;
+                        let mut pos = self.cursor.get();
 
                         while pos.y < 100 {
                             self.write_atom(pos, None);
                             pos.x += 1;
 
-                            if pos.x >= self.term_width {
+                            if pos.x >= self.size.get().x {
                                 pos.x = 0;
                                 pos.y += 1;
                             }
@@ -324,13 +576,13 @@ impl Perform for PerfAtom {
 
                     // clear from cursor to begin
                     1 => {
-                        let mut pos = self.cursor;
+                        let mut pos = self.cursor.get();
                         while pos.y >= 0 || pos.x >= 0 {
                             self.write_atom(pos, None);
 
                             pos.x -= 1;
                             if pos.x < 0 {
-                                pos.x = self.term_width;
+                                pos.x = self.size.get().x;
                                 pos.y -= 1;
                             }                            
                         }
@@ -341,12 +593,12 @@ impl Perform for PerfAtom {
                     // erase entire screen
                     2 => {
                         for y in 0 .. 100 {
-                            for x in 0 .. self.term_width {
+                            for x in 0 .. self.size.get().x {
                                 self.write_atom(Point2::new(x, y), None);
                             }
                         }
 
-                        self.cursor = Point2::new(0, 0);
+                        self.cursor.set(Point2::new(0, 0));
                     }
 
                     // invalid
@@ -359,22 +611,25 @@ impl Perform for PerfAtom {
 
                     // clear from cursor until end of line
                     0 => {
-                        for x in self.cursor.x .. self.term_width {
+                        let c = self.cursor.get();
-                            self.write_atom(Point2::new(x, self.cursor.y), Some(TerminalAtom::new(' ', self.get_style())));
+                        for x in c.x .. self.size.get().x {
+                            self.write_atom(Point2::new(x, c.y), Some(TerminalAtom::new(' ', self.get_style())));
                         }
                     },
 
                     // clear from start of line until cursor
                     1 => {
-                        for x in 0 .. self.cursor.x {
+                        let c = self.cursor.get();
-                            self.write_atom(Point2::new(x, self.cursor.y), Some(TerminalAtom::new(' ', self.get_style())));
+                        for x in 0 .. c.x {
+                            self.write_atom(Point2::new(x, c.y), Some(TerminalAtom::new(' ', self.get_style())));
                         }
                     },
 
                     // clear entire line
                     2 => {
-                        for x in 0 .. self.term_width {
+                        let c = self.cursor.get();
-                            self.write_atom(Point2::new(x, self.cursor.y), Some(TerminalAtom::new(' ', self.get_style())));
+                        for x in 0 .. self.size.get().x {
+                            self.write_atom(Point2::new(x, c.y), Some(TerminalAtom::new(' ', self.get_style())));
                         }
                     },
 
@@ -386,7 +641,7 @@ impl Perform for PerfAtom {
             'M' => {
                 let n = piter.next().unwrap_or(&[1])[0] as i16;
                 for y in 0 .. n {
-                    for x in 0 .. self.term_width {
+                    for x in 0 .. self.size.get().x {
                         self.write_atom(Point2::new(x, self.cursor.y+y), None);
                     }
                 }
@@ -401,14 +656,11 @@ impl Perform for PerfAtom {
                     self.write_atom(Point2::new(self.cursor.x + x as i16, self.cursor.y), None);
                 }
             }
-*/
+             */
-            's' => {
+            'S' => { self.scroll_up(piter.next().unwrap_or(&[1])[0] as usize); }
-                self.save_cursor_position();
+            'T' => { self.scroll_dn(piter.next().unwrap_or(&[1])[0] as usize); }
-            }
+            's' => { self.save_cursor_position(); }
-            'u' => {
+            'u' => { self.restore_cursor_position(); }            
-                self.restore_cursor_position();
-            }
-            
             _ => {
                 /*
                 eprintln!(
@@ -421,7 +673,6 @@ impl Perform for PerfAtom {
     }
 
     fn esc_dispatch(&mut self, intermediates: &[u8], ignore: bool, byte: u8) {
-
         match (byte, intermediates) {
             //(b'B', intermediates) => configure_charset!(StandardCharset::Ascii, intermediates),
             (b'D', []) => self.linefeed(),