handle tty raw mode ourselves

linux/src/keys.rs

@@ -0,0 +1 @@
+//

linux/src/lib.rs

@@ -1,2 +1,2 @@
 pub mod fb;
-
+pub mod raw;

linux/src/raw.rs

@@ -0,0 +1,65 @@
+use std::io::Stdout;
+use std::mem::zeroed;
+use std::os::fd::AsRawFd;
+
+use libc::{ cfmakeraw, c_int, tcgetattr, tcsetattr, termios, TCSAFLUSH };
+
+//https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
+//on TCSAFLUSH: "The TCSAFLUSH argument specifies when to apply the change: in this case, it waits for all pending output to be written to the terminal, and also discards any input that hasn't been read."
+
+//https://www.man7.org/linux/man-pages/man3/termios.3.html
+//(use cfmakeraw instead doing all those bitwise stuff manually)
+
+//enter and exit tty raw mode
+
+pub struct RawStdout {
+  pub stdout: Stdout,
+  old_termios: termios,
+}
+
+impl RawStdout {
+  pub fn new(stdout: Stdout) -> Self {
+    RawStdout {
+      stdout,
+      old_termios: unsafe { zeroed() },
+    }
+  }
+
+  pub fn get_termios(raw_fd: c_int) -> Result<termios, ()> {
+    let mut termios_struct: termios = unsafe { zeroed() };
+    let result = unsafe {
+      tcgetattr(raw_fd, &mut termios_struct)
+    };
+    if result != -1 {
+      Ok(termios_struct)
+    } else {
+      Err(())
+    }
+  }
+
+  pub fn enter_raw_mode(&mut self) -> Result<(), ()> {
+    let raw_fd = self.stdout.as_raw_fd();
+    let mut termios_struct = Self::get_termios(raw_fd)?;
+    self.old_termios = termios_struct;
+    let result = unsafe {
+      cfmakeraw(&mut termios_struct);
+      tcsetattr(raw_fd, TCSAFLUSH, &mut termios_struct)
+    };
+    if result != -1 {
+      Ok(())
+    } else {
+      Err(())
+    }
+  }
+
+  pub fn exit_raw_mode(&mut self) -> Result<(), ()> {
+    let result = unsafe {
+      tcsetattr(self.stdout.as_raw_fd(), TCSAFLUSH, &mut self.old_termios)
+    };
+    if result != -1 {
+      Ok(())
+    } else {
+      Err(())
+    }
+  }
+}