Rename scheduling to 'async_io', general cleanup

libk/src/std/io.rs

@@ -0,0 +1,84 @@
+pub use crate::drivers::io::{
+    ascii::{_print, _print_err, _print_log},
+    print, print_log, printerr, println, println_log, printlnerr,
+    serial::_serial_write,
+    serial_print, serial_println,
+};
+
+pub mod stdin {
+    use alloc::string::String;
+
+    use crate::drivers::io::{
+        ascii::WRITER,
+        keyboard::{KeyStroke, get_keystroke_async, get_keystroke_optional},
+    };
+
+    /// Reads a line of input from standard input asynchronously, returning a `String` containing
+    /// the input line. Does not include the newline character at the end of the line.
+    ///
+    /// If the user presses the abort key (usually Ctrl+C), the returned string will be empty.
+    ///
+    /// This function is currently unimplemented.
+    pub async fn read_line() -> String {
+        let mut writer = WRITER.lock();
+
+        let mut buff = String::new();
+        loop {
+            match get_keystroke_async().await {
+                KeyStroke::Char(c) => match c {
+                    '\n' => {
+                        writer.write_glyph(c as u8);
+                        return buff;
+                    }
+                    '\r' => {
+                        writer.write_glyph(c as u8);
+                        return buff;
+                    }
+                    '\x08' => {
+                        if !buff.is_empty() {
+                            buff.pop();
+                            writer.backspace();
+                        }
+                    }
+
+                    c => {
+                        writer.write_glyph(c as u8);
+                        buff.push(c)
+                    }
+                },
+                KeyStroke::Enter => {
+                    writer.write_glyph(b'\n');
+                    return buff;
+                }
+                KeyStroke::Backspace => {
+                    if !buff.is_empty() {
+                        buff.pop();
+                        writer.backspace();
+                    }
+                }
+                _ => continue,
+            }
+        }
+    }
+
+    /// Reads a character from standard input and blocks the current task until a character is
+    /// available.
+    ///
+    /// # Note
+    ///
+    /// This function is not yet implemented.
+    pub async fn async_keystroke() -> KeyStroke {
+        get_keystroke_async().await
+    }
+
+    /// Attempt to read a character from standard input without blocking the current task.
+    ///
+    /// If no character is available, returns `None`.
+    ///
+    /// # Note
+    ///
+    /// This function is not yet implemented.
+    pub fn keystroke() -> Option<KeyStroke> {
+        get_keystroke_optional()
+    }
+}