From dd04850c27e8bc273506f4a64bb28b7ddf111dc5 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 24 Jul 2025 20:51:55 +0000
Subject: kapi: rework text device interface

---
 arch/x86_64/include/x86_64/vga/text.hpp | 122 +++++++++++++-------------------
 1 file changed, 48 insertions(+), 74 deletions(-)

(limited to 'arch/x86_64/include')

diff --git a/arch/x86_64/include/x86_64/vga/text.hpp b/arch/x86_64/include/x86_64/vga/text.hpp
index 267eae9..f8e6f1b 100644
--- a/arch/x86_64/include/x86_64/vga/text.hpp
+++ b/arch/x86_64/include/x86_64/vga/text.hpp
@@ -1,9 +1,10 @@
 #ifndef TEACHOS_X86_64_VIDEO_VGA_TEXT_HPP
 #define TEACHOS_X86_64_VIDEO_VGA_TEXT_HPP
 
+#include "kapi/cio.hpp"
+
 #include <cstdint>
 #include <string_view>
-#include <type_traits>
 
 namespace teachos::x86_64::vga::text
 {
@@ -89,84 +90,57 @@ namespace teachos::x86_64::vga::text
         attribute{color::gray, foreground_flag::intense, color::red, background_flag::none};
   }  // namespace common_attributes
 
-  /**
-   * @brief Clear the VGA text mode buffer.
-   *
-   * @note This function also resets the text mode buffer pointer.
-   *
-   * @param attribute The attribute to "clear" the screen with.
-   */
-  auto clear(attribute attribute = common_attributes::gray_on_black) -> void;
-
-  /**
-   * @brief Enable or disable the VGA text mode cursor.
-   *
-   * @param enabled Whether or not to enable the cursors.
-   */
-  auto cursor(bool enabled) -> void;
+  struct device final : teachos::cio::output_device
+  {
+    /**
+     * @brief Clear the VGA text mode buffer.
+     *
+     * @note This function also resets the text mode buffer pointer.
+     *
+     * @param attribute The attribute to "clear" the screen with.
+     */
+    auto clear(attribute attribute = common_attributes::gray_on_black) -> void;
 
-  /**
-   * @brief Move the cursor to a new line, scrolling the buffer if necessary.
-   */
-  auto newline() -> void;
+    /**
+     * @brief Enable or disable the VGA text mode cursor.
+     *
+     * @param enabled Whether or not to enable the cursors.
+     */
+    auto cursor(bool enabled) -> void;
 
-  /**
-   * @brief Write a string of code points to the VGA text buffer.
-   *
-   * @note This function also updates the text mode buffer pointer.
-   *
-   * @param code_points A string of (8-bit) code points to write to the VGA text mode buffer.
-   * @param attribute The attribute to apply to the written sequence of code points.
-   * @see vga::text::attribute
-   */
-  auto write(std::string_view code_points, attribute attribute) -> void;
+    auto write(std::string_view text) -> void override { write(text, common_attributes::green_on_black); }
+    auto writeln(std::string_view text) -> void override { writeln(text, common_attributes::green_on_black); }
+    auto write_error(std::string_view text) -> void override { write(text, common_attributes::red_on_black); }
+    auto writeln_error(std::string_view text) -> void override { writeln(text, common_attributes::red_on_black); }
 
-  /**
-   * @brief Write a single character to the VGA text buffer.
-   *
-   * @note This function also updates the text mode buffer pointer.
-   *
-   * @param code_point A code point to write to the VGA text mode buffer.
-   * @param attribute The attribute to apply to the written sequence of code points.
-   * @see vga::text::attribute
-   */
-  auto write_char(char code_point, attribute attribute) -> void;
+  private:
+    /**
+     * @brief Move the cursor to a new line, scrolling the buffer if necessary.
+     */
+    auto newline() -> void;
 
-  template<typename T>
-  concept Integral = std::is_integral_v<T>;
+    /**
+     * @brief Write a string of code points to the VGA text buffer.
+     *
+     * @note This function also updates the text mode buffer pointer.
+     *
+     * @param code_points A string of (8-bit) code points to write to the VGA text mode buffer.
+     * @param attribute The attribute to apply to the written sequence of code points.
+     * @see vga::text::attribute
+     */
+    auto write(std::string_view code_points, attribute attribute) -> void;
 
-  /**
-   * @brief Write a integral value to the VGA text buffer.
-   *
-   * @note This function also updates the text mode buffer pointer.
-   *
-   * @param value A integral value to write to the VGA text mode buffer.
-   * @param attribute The attribute to apply to the written sequence of code points.
-   * @see vga::text::attribute
-   */
-  template<Integral T>
-  auto write_number(T value, attribute attribute) -> void
-  {
-    T current_value = value;
-    T divisor = 1;
-
-    while (current_value > 9)
-    {
-      divisor *= 10;
-      current_value = current_value / 10;
-    }
-
-    current_value = value;
-    while (divisor > 0)
-    {
-      uint8_t quotient = current_value / divisor;
-      char ascii_digit = quotient + '0';
-
-      write_char(ascii_digit, attribute);
-      current_value %= divisor;
-      divisor /= 10;
-    }
-  }
+    /**
+     * @brief Write a string of code points followed by a newline to the VGA text buffer.
+     *
+     * @note This function also updates the text mode buffer pointer.
+     *
+     * @param code_points A string of (8-bit) code points to write to the VGA text mode buffer.
+     * @param attribute The attribute to apply to the written sequence of code points.
+     * @see vga::text::attribute
+     */
+    auto writeln(std::string_view code_points, attribute attribute) -> void;
+  };
 
 }  // namespace teachos::x86_64::vga::text
 
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