really terrible backspace

src/input.rs

@@ -178,8 +178,12 @@ impl Reader {
     fn next_escape_sequence(&mut self) -> Result<Event> {
         self.take_bracket()?;
         match self.next_escape_char()? {
-            'D' => Ok(Event::Left),
+            'A' => Ok(Event::Up),
+            'B' => Ok(Event::Down),
             'C' => Ok(Event::Right),
+            'D' => Ok(Event::Left),
+            'H' => Ok(Event::Home),
+            'F' => Ok(Event::End),
             e => Err(Error::input_error(format!("unexpected escape char: {}", e)).into()),
         }
     }
@@ -229,6 +233,10 @@ pub enum Event {
     Size,
     Left,
     Right,
+    Up,
+    Down,
+    Home,
+    End,
 }
 
 const ALT_KEYS: u32 = 0x0002 | 0x0001;
@@ -255,10 +263,15 @@ impl From<Console::INPUT_RECORD> for Event {
                     let mstate = event.dwControlKeyState;
                     let c = char::from_u32(event.uChar.UnicodeChar as u32).unwrap_or('💀');
 
+                    if event.bKeyDown.as_bool() {
+                        debug!("key down {}", event.wVirtualKeyCode);
+                    } else {
+                        debug!("key up {}", event.wVirtualKeyCode);
+                    }
                     Event::Key(key::Event {
                         down: event.bKeyDown.as_bool(),
                         repeats: event.wRepeatCount,
-                        code: event.wVirtualKeyCode,
+                        code: key::CODES[event.wVirtualKeyCode as usize],
                         alt: mstate & ALT_KEYS > 0,
                         ctrl: mstate & CTRL_KEYS > 0,
                         shift: mstate & SHIFT_PRESSED > 0,

src/key.rs

@@ -1,4 +1,13 @@
-type Code = u16;
+// type Code = u16;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub struct Code {
+    /// The integer value of the keycode
+    pub val: u16,
+
+    /// The unicode symbol that represents the keycode, if any
+    pub sym: Option<char>,
+}
 
 #[derive(Debug)]
 pub struct Event {
@@ -26,54 +35,35 @@ pub struct Event {
 
 impl Event {}
 
-impl std::fmt::Display for Event {
+/// CODES contains a lookup table for key codes. Note that this is a sparse array and not all
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+/// values associate to valid key codes.
-        if self.shift {
+pub static CODES: [Code; 256] = gen_codes();
-            if self.ctrl {
+
-                if self.alt {
+macro_rules! keycodes {
-                    // write!(f, "⇧⎈⎇ {}", self.char)
+    ($($val:literal $name:ident $sym:literal)*) => {
-                    write!(f, "<S-C-A-{}>", self.char)
+        const fn gen_codes() -> [Code; 256] {
-                } else {
+            let mut codes = [Code{val: 0, sym: None}; 256];
-                    // write!(f, "⇧⎈ {}", self.char)
+            let mut i = 0 as usize;
-                    write!(f, "<S-C-{}>", self.char)
+            while i < 256 {
-                }
+                codes[i] = Code{val: i as u16, sym: None};
-            } else {
+                i = i + 1;
-                if self.alt {
-                    // write!(f, "⇧⎇ {}", self.char)
-                    write!(f, "<S-A-{}>", self.char)
-                } else {
-                    write!(f, "<S-{}>", self.char)
-                }
-            }
-        } else {
-            if self.ctrl {
-                if self.alt {
-                    // write!(f, "⎈⎇ {}", self.char)
-                    write!(f, "<C-A-{}>", self.char)
-                } else {
-                    // write!(f, "⎈ {}", self.char)
-                    write!(f, "<C-{}>", self.char)
-                }
-            } else {
-                if self.alt {
-                    // write!(f, "⎇ {}", self.char)
-                    write!(f, "<A-{}>", self.char)
-                } else {
-                    write!(f, "{}", self.char)
-                }
-            }
-        }
             }
+
+            $(
+                codes[$val] = Code{val: $val, sym: Some($sym)};
+            )*
+            codes
         }
 
-macro_rules! keycodes {
+        $(
-    ($($c:literal $n:ident $x:literal)*) => {$(
             #[allow(dead_code)]
-        pub const $n: Code = $c;
+            pub const $name: Code = Code{val: $val, sym: Some($sym)};
-    )*};
+        )*
+    }
 }
 
 keycodes! {
+    0x07 NOTBACKSPACE '⌫'
     0x08 BACKSPACE '⌫'
     0x09 TAB '↹'
     // 0x0A-0B 	Reserved

src/line.rs

@@ -46,6 +46,16 @@ impl Line {
         }
     }
 
+    pub fn backspace(&mut self) -> bool {
+        if self.cursor > 0 {
+            self.cursor -= 1;
+            self.chars.remove(self.cursor);
+            true
+        } else {
+            false
+        }
+    }
+
     pub fn forward(&mut self) -> bool {
         if self.cursor < self.chars.len() {
             self.cursor += 1;

src/main.rs

@@ -163,7 +163,6 @@ fn main() -> Result<()> {
     loop {
         match input.next()? {
             input::Event::Key(event) => {
-                debug!("Key Event: {}", event);
                 if event.down {
                     continue;
                 }
@@ -177,6 +176,34 @@ fn main() -> Result<()> {
                     continue;
                 }
 
+                if event.code == key::TAB {
+                    continue;
+                }
+
+                if event.code == key::BACKSPACE {
+                    if line.backspace() {
+                        let text = format!("\x1b[2D");
+                        unsafe {
+                            Error::check(Console::WriteConsoleA(stdout, text.as_bytes(), None, None))?;
+                        }
+                        let tail = format!("{} ", line.tail());
+                        let n = tail.chars().count();
+                        unsafe {
+                            Error::check(Console::WriteConsoleA(
+                                stdout,
+                                tail.as_bytes(),
+                                None,
+                                None,
+                            ))?;
+                        }
+                        let text = format!("\x1b[1D");
+                        unsafe {
+                            Error::check(Console::WriteConsoleA(stdout, text.as_bytes(), None, None))?;
+                        }
+                    }
+                    continue;
+                }
+
                 if event.ctrl && event.code == key::D {
                     unsafe {
                         CloseHandle(stdout);
@@ -185,8 +212,8 @@ fn main() -> Result<()> {
                 }
 
                 if event.ctrl && event.code == key::J {
-                    // red bullet
                     unsafe {
+                        // red bullet
                         let text = "\x1b[31m\u{2022}\x1b[0m";
                         Error::check(Console::WriteConsoleA(stdout, text.as_bytes(), None, None))?;
                     }
@@ -220,7 +247,7 @@ fn main() -> Result<()> {
                     continue;
                 }
 
-                debug!("Unhandled Keyboard Event: {}", event);
+                debug!("Unhandled Keyboard Event: {:?}", event.code);
             }
             input::Event::Left => {
                 if line.back() {
@@ -238,6 +265,10 @@ fn main() -> Result<()> {
                     }
                 }
             }
+            input::Event::Up => {},
+            input::Event::Down => {},
+            input::Event::Home => {},
+            input::Event::End => {},
             input::Event::Focus(true) => {},
             input::Event::Focus(false) => {},
             input::Event::Menu(_command_id) => {},