scripts: flatpak: respect XDG data home in launcher script, add Steam Flatpak data directory

scripts/flatpak/run.sh

@@ -1,24 +1,58 @@
 #!/bin/sh
 
+die()
+{
+        echo "$@"
+        exit 1
+}
+
 echo "Xash3D FWGS installed as Flatpak."
 
-export XASH3D_BASEDIR="$HOME/.xash/"
-mkdir -p $XASH3D_BASEDIR
-cd $XASH3D_BASEDIR
-echo "Base directory is $XASH3D_BASEDIR"
+# https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+# $XDG_DATA_HOME defines the base directory relative to which user-specific data files should be stored.
+# If $XDG_DATA_HOME is either not set or empty, a default equal to $HOME/.local/share should be used.
+if [ -z "$XDG_DATA_HOME" ]; then
+        export XDG_DATA_HOME="$HOME/.local/share"
+fi
+
+if [ -z "$XASH3D_BASEDIR" ]; then
+        export XASH3D_BASEDIR="$XDG_DATA_HOME/xash3d-fwgs/"
+fi
+
+mkdir -p "$XASH3D_BASEDIR"
+cd "$XASH3D_BASEDIR" || die "Can't cd into $XASH3D_BASEDIR"
+echo "XASH3D_BASEDIR is $XASH3D_BASEDIR"
+
+if [ -z "$XASH3D_RODIR" ]; then
+        # TODO: detect by libraryfolders.vdf and installed apps
+        STEAMDIRS="\
+                $HOME/.local/share/Steam/steamapps/common/ \
+                $HOME/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/common \
+                $HOME/.steam/steam/steamapps/common"
+        HALFLIFEDIR="Half-Life"
+
+        for i in $STEAMDIRS; do
+                if [ ! -d "$i" ]; then
+                        continue
+                fi
+
+                echo "Detected Steam library in $i, probing Half-Life..."
+
+                if [ ! -d "$i$HALFLIFEDIR" ]; then
+                        continue
+                fi
 
-# TODO: detect by libraryfolders.vdf and installed apps
-HALFLIFESTEAMDIRS="../.local/share/Steam/steamapps/common/Half-Life ../.steam/steam/steamapps/common/Half-Life"
+                echo "Detected Half-Life installation in $i$HALFLIFEDIR..."
 
-for i in $HALFLIFESTEAMDIRS; do
-#	echo $i
-	if [ -d "$i" ]; then
-		echo "Detected Half-Life installation in $i, using as RoDir"
-		export XASH3D_RODIR=$i
-		break
-	fi
-done
+                export XASH3D_RODIR="$i$HALFLIFEDIR"
+                break
+        done
+fi
+echo "XASH3D_RODIR is $XASH3D_RODIR"
 
+if [ -z "$XASH3D_EXTRAS_PAK1" ]; then
+        export XASH3D_EXTRAS_PAK1=/app/share/xash3d/valve/extras.pk3
+fi
+echo "XASH3D_EXTRAS_PAK1 is $XASH3D_EXTRAS_PAK1"
 
-export XASH3D_EXTRAS_PAK1=/app/share/xash3d/valve/extras.pk3
 exec $DEBUGGER /app/lib32/xash3d/xash3d "$@"