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iwad: Search Steam-on-Linux paths for WAD files

Windows games can now be installed via the Linux version of Steam,
so let’s automatically find any installed copies of the games.

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -650,8 +650,37 @@

     // Classic WADs.

     AddIWADPath(env, "/games/doom3bfg/base/wads");

 }

-#endif

+#ifndef __MACOSX__

+// Steam on Linux allows installing some select Windows games,

+// including the classic Doom series (running DOSBox via Wine).  We

+// could parse *.vdf files to more accurately detect installation

+// locations, but the defaults are likely to be good enough for just

+// about everyone.

+static void AddSteamDirs(void)

+{

+    char *homedir, *steampath;

+

+    homedir = getenv("HOME");

+    if (homedir == NULL)

+    {

+        homedir = "/";

+    }

+    steampath = M_StringJoin(homedir, "/.steam/root/steamapps/common", NULL);

+

+    AddIWADPath(steampath, "/Doom 2/base");

+    AddIWADPath(steampath, "/Master Levels of Doom/doom2");

+    AddIWADPath(steampath, "/Ultimate Doom/base");

+    AddIWADPath(steampath, "/Final Doom/base");

+    AddIWADPath(steampath, "/DOOM 3 BFG Edition/base/wads");

+    AddIWADPath(steampath, "/Heretic Shadow of the Serpent Riders/base");

+    AddIWADPath(steampath, "/Hexen/base");

+    AddIWADPath(steampath, "/Hexen Deathkings of the Dark Citadel/base");

+    AddIWADPath(steampath, "/Strife");

+}

+#endif // __MACOSX__

+#endif // !_WIN32

+

 //

 // Build a list of IWAD files

 //

@@ -701,6 +730,9 @@

 #else

     AddXdgDirs();

+#ifndef __MACOSX__

+    AddSteamDirs();

+#endif

 #endif

     // Don't run this function again.