From 3d9c482eaee016ffe7932cc2eb49805ae147de6d Mon Sep 17 00:00:00 2001
From: Alibek Omarov <a1ba.omarov@gmail.com>
Date: Wed, 4 Mar 2020 08:55:22 +0300
Subject: [PATCH] host: add -help, fix #136

---
 engine/common/host.c | 103 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/engine/common/host.c b/engine/common/host.c
index d1619ad9..9f1b043e 100644
--- a/engine/common/host.c
+++ b/engine/common/host.c
@@ -61,6 +61,101 @@ convar_t	*host_sleeptime;
 convar_t	*con_gamemaps;
 convar_t	*build, *ver;
 
+void Sys_PrintUsage( void )
+{
+	const char *usage_str;
+
+#define O(x,y) "   "x"  "y"\n"
+
+	usage_str = ""
+#if XASH_MESSAGEBOX == MSGBOX_STDERR
+	"\n" // dirty hack to not have Xash Error: Usage: on same line
+#endif // XASH_MESSAGEBOX == MSGBOX_STDERR
+	"Usage:\n"
+#if !XASH_MOBILE_PLATFORM
+	#if XASH_WIN32
+	O("<xash>.exe [options] [+command1] [+command2 arg]","")
+	#else // XASH_WIN32
+	O("<xash> [options] [+command1] [+command2 arg]","")
+	#endif // !XASH_WIN32
+#endif // !XASH_MOBILE_PLATFORM
+	"Options:\n"
+	O("-dev [level]     ","set log verbosity 0-2")
+	O("-log             ","write log to \"engine.log\"")
+	O("-nowriteconfig   ","disable config save")
+#if !XASH_WIN32
+	O("-casesensitive   ","disable case-insensitive FS emulation")
+#endif // !XASH_WIN32
+#if !XASH_MOBILE_PLATFORM
+	O("-daemonize       ","run engine in background, dedicated only")
+#endif // !XASH_MOBILE_PLATFORM
+
+#if !XASH_DEDICATED
+	O("-toconsole       ","run engine witn console open")
+	O("-width <n>       ","set window width")
+	O("-height <n>      ","set window height")
+	O("-oldfont         ","enable unused Quake font in Half-Life")
+
+	#if !XASH_MOBILE_PLATFORM
+	O("-fullscreen      ","run engine in fullscreen mode")
+	O("-windowed        ","run engine in windowed mode")
+	O("-dedicated       ","run engine in dedicated server mode")
+	#endif // XASH_MOBILE_PLATFORM
+
+	#if XASH_ANDROID
+        O("-nativeegl       ","use native egl implementation. Use if screen does not update or black")
+	#endif // XASH_ANDROID
+
+	#if XASH_WIN32
+        O("-noavi           ","disable AVI support")
+        O("-nointro         ","disable intro video")
+	#endif // XASH_WIN32
+
+	#if XASH_DOS
+	O("-novesa          ","disable vesa")
+	#endif // XASH_DOS
+
+	#if XASH_VIDEO == VIDEO_FBDEV
+	O("-fbdev <path>    ","open selected framebuffer")
+	O("-ttygfx          ","set graphics mode in tty")
+	O("-doublebuffer    ","enable doublebuffering")
+	#endif // XASH_VIDEO == VIDEO_FBDEV
+
+	#if XASH_SOUND == SOUND_ALSA
+	O("-alsadev <dev>   ","open selected ALSA device")
+	#endif // XASH_SOUND == SOUND_ALSA
+
+	O("-nojoy           ","disable joystick support")
+	#ifdef XASH_SDL
+	O("-sdl_joy_old_api ","use SDL legacy joystick API")
+	O("-sdl_renderer <n>","use alternative SDL_Renderer for software")
+	#endif // XASH_SDL
+	O("-nosound         ","disable sound")
+	O("-noenginemouse   ","disable mouse completely")
+
+	O("-ref <name>      ","use selected renderer dll")
+        O("-gldebug         ","enable OpenGL debug log")
+
+#endif // XASH_DEDICATED
+
+	O("-noip            ","disable TCP/IP")
+	O("-noch            ","disable crashhandler")
+	O("-disablehelp     ","disable this message")
+	O("-dll <path>      ","override server DLL path")
+#ifndef XASH_DEDICATED
+	O("-clientlib <path>","override client DLL path")
+#endif
+	O("-rodir <path>    ","set read-only base directory, experimental")
+
+	O("-ip <ip>         ","set custom ip")
+	O("-port <port>     ","set custom host port")
+	O("-clockwindow <cw>","adjust clockwindow")
+	;
+#undef  O
+
+	Sys_Error( "%s", usage_str );
+}
+
 int Host_CompareFileTime( int ft1, int ft2 )
 {
 	if( ft1 < ft2 )
@@ -674,6 +769,14 @@ void Host_InitCommon( int argc, char **argv, const char *progname, qboolean bCha
 	// so we clear all cmd_args, but leave dbg states as well
 	Sys_ParseCommandLine( argc, argv );
 
+	if( !Sys_CheckParm( "-disablehelp" ) )
+	{
+	    if( Sys_CheckParm( "-help" ) || Sys_CheckParm( "-h" ) || Sys_CheckParm( "--help" ) )
+	    {
+			Sys_PrintUsage();
+	    }
+	}
+
 	if( !Sys_CheckParm( "-noch" ) )
 		Sys_SetupCrashHandler();