From 653000bdd66370510c5ec0d88ef13cdd0ac66e57 Mon Sep 17 00:00:00 2001
From: Darkvater <darkvater@openttd.org>
Date: Mon, 16 May 2005 13:46:26 +0000
Subject: [PATCH] (svn r2332) - Feature: Add 'clear' command and CTRL+L to
 empty the console window - Fix: do not execute emtpy commands anymore

---
 console.c      | 15 +++++++++++++--
 console.h      |  2 +-
 console_cmds.c | 14 +++++++++++++-
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/console.c b/console.c
index 4b35a7e87c..88dc364558 100644
--- a/console.c
+++ b/console.c
@@ -151,6 +151,9 @@ static void IConsoleWndProc(Window* w, WindowEvent* e)
 						SetWindowDirty(w);
 					}
 					break;
+					case (WKC_CTRL | 'L'):
+					IConsoleCmdExec("clear");
+					break;
 				case WKC_BACKSPACE: case WKC_DELETE:
 					if (DeleteTextBufferChar(&_iconsole_cmdline, e->keypress.keycode)) {
 						IConsoleResetHistoryPos();
@@ -222,13 +225,19 @@ void IConsoleInit(void)
 	IConsoleHistoryAdd("");
 }
 
-void IConsoleClear(void)
+void IConsoleClearBuffer(void)
 {
 	uint i;
-	for (i = 0; i <= ICON_BUFFER; i++)
+	for (i = 0; i <= ICON_BUFFER; i++) {
 		free(_iconsole_buffer[i]);
+		_iconsole_buffer[i] = NULL;
+	}
+}
 
+static void IConsoleClear(void)
+{
 	free(_iconsole_cmdline.buf);
+	IConsoleClearBuffer();
 }
 
 static void IConsoleWriteToLogFile(const char* string)
@@ -1022,6 +1031,8 @@ void IConsoleCmdExec(const char *cmdstr)
 	bool longtoken = false;
 	bool foundtoken = false;
 
+	if (*cmdstr == '\0') return; // don't execute empty commands
+
 	for (cmdptr = cmdstr; *cmdptr != '\0'; cmdptr++) {
 		if (!IsValidAsciiChar(*cmdptr)) {
 			IConsoleError("command contains malformed characters, aborting");
diff --git a/console.h b/console.h
index 63555d2423..e37f344ab7 100644
--- a/console.h
+++ b/console.h
@@ -114,8 +114,8 @@ VARDEF IConsoleModes _iconsole_mode;
 
 // ** console functions ** //
 void IConsoleInit(void);
-void IConsoleClear(void);
 void IConsoleFree(void);
+void IConsoleClearBuffer(void);
 void IConsoleResize(void);
 void IConsoleSwitch(void);
 void IConsoleClose(void);
diff --git a/console_cmds.c b/console_cmds.c
index 502bc10482..3b21591426 100644
--- a/console_cmds.c
+++ b/console_cmds.c
@@ -268,7 +268,6 @@ DEF_CONSOLE_CMD(ConChangeDirectory)
 	return true;
 }
 
-
 DEF_CONSOLE_CMD(ConPrintWorkingDirectory)
 {
 	const char *path;
@@ -287,6 +286,18 @@ DEF_CONSOLE_CMD(ConPrintWorkingDirectory)
 	return true;
 }
 
+DEF_CONSOLE_CMD(ConClearBuffer)
+{
+	if (argc == 0) {
+		IConsoleHelp("Clear the console buffer. Usage: 'clear'");
+		return true;
+	}
+
+	IConsoleClearBuffer();
+	InvalidateWindow(WC_CONSOLE, 0);
+	return true;
+}
+
 
 // ********************************* //
 // * Network Core Console Commands * //
@@ -1217,6 +1228,7 @@ void IConsoleStdLibRegister(void)
 	IConsoleCmdRegister("ls",           ConListFiles);
 	IConsoleCmdRegister("cd",           ConChangeDirectory);
 	IConsoleCmdRegister("pwd",          ConPrintWorkingDirectory);
+	IConsoleCmdRegister("clear",        ConClearBuffer);
 
 	IConsoleAliasRegister("dir",      "ls");
 	IConsoleAliasRegister("newmap",   "newgame");