From dafc016293a956d47cfd190404715d6532f2a80e Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Fri, 13 Oct 2023 17:20:26 +0300
Subject: [PATCH] Kernel: Clear TTY when setting as current

Actually this should replace from old buffer, but this works
for now.
---
 kernel/include/kernel/Terminal/Serial.h     | 4 +++-
 kernel/include/kernel/Terminal/TTY.h        | 4 +++-
 kernel/include/kernel/Terminal/VirtualTTY.h | 5 +++--
 kernel/kernel/Terminal/TTY.cpp              | 1 +
 4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/kernel/include/kernel/Terminal/Serial.h b/kernel/include/kernel/Terminal/Serial.h
index fc6032a41..4abea34e3 100644
--- a/kernel/include/kernel/Terminal/Serial.h
+++ b/kernel/include/kernel/Terminal/Serial.h
@@ -43,7 +43,8 @@ namespace Kernel
 		
 		virtual uint32_t width() const override;
 		virtual uint32_t height() const override;
-		virtual void putchar_impl(uint8_t) override;
+
+		virtual void clear() override { putchar_impl('\e'); putchar_impl('['); putchar_impl('2'); putchar_impl('J'); }
 
 		virtual void update() override;
 
@@ -51,6 +52,7 @@ namespace Kernel
 
 	protected:
 		virtual BAN::StringView name() const override { return m_name; }
+		virtual void putchar_impl(uint8_t) override;
 
 	private:
 		SerialTTY(Serial);
diff --git a/kernel/include/kernel/Terminal/TTY.h b/kernel/include/kernel/Terminal/TTY.h
index 5b876a259..b5c87749b 100644
--- a/kernel/include/kernel/Terminal/TTY.h
+++ b/kernel/include/kernel/Terminal/TTY.h
@@ -38,7 +38,8 @@ namespace Kernel
 		virtual uint32_t height() const = 0;
 		virtual uint32_t width() const = 0;
 		void putchar(uint8_t ch);
-		virtual void putchar_impl(uint8_t ch) = 0;
+
+		virtual void clear() = 0;
 
 		virtual bool has_data_impl() const override;
 
@@ -47,6 +48,7 @@ namespace Kernel
 			: CharacterDevice(mode, uid, gid)
 		{ }
 
+		virtual void putchar_impl(uint8_t ch) = 0;
 		virtual BAN::ErrorOr<size_t> read_impl(off_t, void*, size_t) override;
 		virtual BAN::ErrorOr<size_t> write_impl(off_t, const void*, size_t) override;
 
diff --git a/kernel/include/kernel/Terminal/VirtualTTY.h b/kernel/include/kernel/Terminal/VirtualTTY.h
index 3f3fdbf45..e8b7a117f 100644
--- a/kernel/include/kernel/Terminal/VirtualTTY.h
+++ b/kernel/include/kernel/Terminal/VirtualTTY.h
@@ -21,15 +21,16 @@ namespace Kernel
 
 		virtual uint32_t height() const override { return m_height; }
 		virtual uint32_t width() const override { return m_width; }
-		virtual void putchar_impl(uint8_t ch) override;
+
+		virtual void clear() override;
 
 	protected:
 		virtual BAN::StringView name() const override { return m_name; }
+		virtual void putchar_impl(uint8_t ch) override;
 
 	private:
 		VirtualTTY(TerminalDriver*);
 
-		void clear();
 		void reset_ansi();
 		void handle_ansi_csi(uint8_t ch);
 		void handle_ansi_csi_color();
diff --git a/kernel/kernel/Terminal/TTY.cpp b/kernel/kernel/Terminal/TTY.cpp
index c25f7c389..de2ed755e 100644
--- a/kernel/kernel/Terminal/TTY.cpp
+++ b/kernel/kernel/Terminal/TTY.cpp
@@ -27,6 +27,7 @@ namespace Kernel
 	void TTY::set_as_current()
 	{
 		s_tty = this;
+		clear();
 
 		auto inode_or_error = DevFileSystem::get().root_inode()->find_inode("tty"sv);
 		if (inode_or_error.is_error())