feat: poc windows support

src/tty/windows.rs

@@ -8,6 +8,30 @@ use super::{Width, Height};
 /// Note that this returns the size of the actual command window, and
 /// not the overall size of the command window buffer
 pub fn terminal_size() -> Option<(Width, Height)> {
+    if let Some((_, csbi)) = get_csbi() {
+        let w: Width = Width((csbi.srWindow.Right - csbi.srWindow.Left) as u16);
+        let h: Height = Height((csbi.srWindow.Bottom - csbi.srWindow.Top) as u16);
+        Some((w, h))
+    } else {
+        None
+    }
+}
+
+fn move_cursor_up(n: usize) -> String {
+    use self::kernel32::SetConsoleCursorPosition;
+    use self::winapi::COORD;
+    if let Some((hand, csbi)) = get_csbi() {
+        unsafe {
+            SetConsoleCursorPosition(hand, COORD {
+                X: 0 as i16,
+                Y: csbi.dwCursorPosition.Y as i16 - n,
+            });
+        }
+    }
+    "".to_string()
+}
+
+fn get_csbi() -> Option<(self::winapi::HANDLE, self::winapi::CONSOLE_SCREEN_BUFFER_INFO)> {
     use self::winapi::HANDLE;
     use self::kernel32::{GetStdHandle, GetConsoleScreenBufferInfo};
     use self::winapi::STD_OUTPUT_HANDLE;
@@ -28,12 +52,8 @@ pub fn terminal_size() -> Option<(Width, Height)> {
         },
         dwMaximumWindowSize: zc,
     };
-    let success: bool = unsafe { GetConsoleScreenBufferInfo(hand, &mut csbi) != 0 };
-    if success {
-        let w: Width = Width((csbi.srWindow.Right - csbi.srWindow.Left) as u16);
-        let h: Height = Height((csbi.srWindow.Bottom - csbi.srWindow.Top) as u16);
-        Some((w, h))
-    } else {
-        None
+    match unsafe { GetConsoleScreenBufferInfo(hand, &mut csbi) } {
+        0 => None,
+        _ => Some((hand, csbi)),
     }
 }