Method KeyDownEvent

neo/framework/Console.cpp:622–731

==================== KeyDownEvent Handles history and console scrollback ==================== */

====================
*/
void idConsoleLocal::KeyDownEvent( int key ) {

	// Execute F key bindings
	if ( key >= K_F1 && key <= K_F12 ) {
		idKeyInput::ExecKeyBinding( key );
		return;
	}

	// ctrl-L clears screen
	if ( key == 'l' && idKeyInput::IsDown( K_CTRL ) ) {
		Clear();
		return;
	}

	// enter finishes the line
	if ( key == K_ENTER || key == K_KP_ENTER ) {

		common->Printf ( "]%s\n", consoleField.GetBuffer() );

		cmdSystem->BufferCommandText( CMD_EXEC_APPEND, consoleField.GetBuffer() );	// valid command
		cmdSystem->BufferCommandText( CMD_EXEC_APPEND, "\n" );

		// copy line to history buffer, if it isn't the same as the last command
		if ( idStr::Cmp( consoleField.GetBuffer(),
		                 historyEditLines[(nextHistoryLine + COMMAND_HISTORY - 1) % COMMAND_HISTORY].GetBuffer()) != 0 )
		{
			historyEditLines[nextHistoryLine % COMMAND_HISTORY] = consoleField;
			nextHistoryLine++;
		}

		historyLine = nextHistoryLine;
		// clear the next line from old garbage, else the oldest history entry turns up when pressing DOWN
		historyEditLines[nextHistoryLine % COMMAND_HISTORY].Clear();

		consoleField.Clear();
		consoleField.SetWidthInChars( LINE_WIDTH );

		session->UpdateScreen();// force an update, because the command
								// may take some time
		return;
	}

	// command completion

	if ( key == K_TAB ) {
		consoleField.AutoComplete();
		return;
	}

	// command history (ctrl-p ctrl-n for unix style)

	if ( ( key == K_UPARROW ) ||
		 ( ( tolower(key) == 'p' ) && idKeyInput::IsDown( K_CTRL ) ) ) {
		if ( nextHistoryLine - historyLine < COMMAND_HISTORY && historyLine > 0 ) {
			historyLine--;
		}
		consoleField = historyEditLines[ historyLine % COMMAND_HISTORY ];
		return;