MODULE BootShell;
	IMPORT SYSTEM, KernelLog, Machine, Modules, Streams, Commands, Inputs, Strings, Locks;
CONST 
	Version = \"A2 Bootshell v1.0"\; 
	LineWidth = 80; 
	TraceHeight = 25; 
	TraceBase = 753664; 
	BufferHeight = 2048; 
	BufferSize = (BufferHeight * LineWidth); 
	TAB = 9X; 
	CR = 0DX; 
	LF = 0AX; 
	SPACE = \" "\; 
	Mode_Insert = 0; 
	Mode_Overwrite = 1; 
	Black = 0; 
	Blue = 1; 
	Green = 2; 
	Cyan = 3; 
	Red = 4; 
	Magenta = 5; 
	Brown = 6; 
	White = 7; 
	Gray = 8; 
	LightBlue = 9; 
	LightGreen = 10; 
	LightCyan = 11; 
	LightRed = 12; 
	LightMagenta = 13; 
	Yellow = 14; 
	BrightWhite = 15; 
TYPE 
	CommandsString = POINTER TO RECORD 
		prev, next: CommandsString; 
		string: Strings.String; 
	END; 

	CommandHistoryObject = OBJECT 
	VAR 
		first, current: CommandsString; 

		PROCEDURE ^ GetNextCommand(): Strings.String; 
		PROCEDURE ^ GetPreviousCommand(): Strings.String; 
		PROCEDURE ^ AddCommand(string: Strings.String); 
		PROCEDURE ^  & Init*; 
	END CommandHistoryObject; 

	Character = RECORD 
		ch: CHAR; 
		color: SHORTINT; 
	END; 

	Line = ARRAY LineWidth OF Character; 

	TextBuffer = OBJECT 
	VAR 
		defaultColor: SHORTINT; 
		currentColor: SHORTINT; 
		lines: ARRAY BufferHeight OF Line; 
		firstLine, lastLine: LONGINT; 
		firstLineShown: LONGINT; 
		editStartPosition, editEndPosition: LONGINT; 
		cursorPosition: LONGINT; 
		mode: LONGINT; 
		lock: Locks.RecursiveLock; 

		PROCEDURE ^  & Init*; 
		PROCEDURE ^ Clear; 
		PROCEDURE ^ SetColor(foreground, background: SHORTINT); 
		PROCEDURE ^ SetEditStart; 
		PROCEDURE ^ Send(CONST data: ARRAY OF CHAR; ofs, len: LONGINT; propagate: BOOLEAN; VAR res: LONGINT); 
		PROCEDURE ^ String(CONST string: ARRAY OF CHAR); 
		PROCEDURE ^ Char(ch: CHAR); 
		PROCEDURE ^ CheckVisibility; 
		PROCEDURE ^ NextLine; 
		PROCEDURE ^ MoveCharactersToRight; 
		PROCEDURE ^ MoveCharactersToLeft; 
		PROCEDURE ^ CharInternal(ch: CHAR); 
		PROCEDURE ^ DeleteCurrentLine; 
		PROCEDURE ^ GetCurrentLine(): Strings.String; 
		PROCEDURE ^ Home; 
		PROCEDURE ^ End; 
		PROCEDURE ^ Backspace; 
		PROCEDURE ^ Delete; 
		PROCEDURE ^ ScrollUp(nofLines: LONGINT); 
		PROCEDURE ^ ScrollDown(nofLines: LONGINT); 
		PROCEDURE ^ CursorLeft; 
		PROCEDURE ^ CursorRight; 
		PROCEDURE ^ Dump(out: Streams.Writer); 
	END TextBuffer; 

	Shell = OBJECT (Inputs.Sink)
	VAR 
		textBuffer: TextBuffer; 
		history: CommandHistoryObject; 

		PROCEDURE ^  & Init; 
		PROCEDURE ^ Handle*(VAR msg: Inputs.Message); 
		PROCEDURE ^ CommandHistory(next: BOOLEAN); 
		PROCEDURE ^ Prompt; 
		PROCEDURE ^ Execute; 
		PROCEDURE ^ Quit; 
	END Shell; 
VAR 
	shell: Shell; 

	PROCEDURE ^ Subtract(position, value, bufferSize: LONGINT): LONGINT; 
	PROCEDURE ^ Add(position, value, bufferSize: LONGINT): LONGINT; 
	PROCEDURE ^ Difference(end, start, bufferSize: LONGINT): LONGINT; 
	PROCEDURE ^ ClearLine(VAR line: Line; from, to: LONGINT; color: SHORTINT); 
	PROCEDURE ^ IsWhitespace(ch: CHAR): BOOLEAN; 
	PROCEDURE ^ Min(a, b: LONGINT): LONGINT; 
	PROCEDURE ^ Invalidate(textBuffer: TextBuffer); 
	PROCEDURE ^ Open*; 
	PROCEDURE ^ Close*; 
	PROCEDURE ^ Dump*(context: Commands.Context); 
	PROCEDURE ^ UpdateCursor(textBuffer: TextBuffer); 
	PROCEDURE ^ Cleanup; 
	PROCEDURE ^ Init; 
BEGIN
END BootShell.