Initial commit

compatibilitytool.vdf

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+"compatibilitytools"
+{
+	"compat_tools"
+	{
+		"custom-tool" // Internal name of this tool
+		{
+			"install_path" "."
+			"display_name" "SteamPlay Custom"
+			"from_oslist"  "windows"
+			"to_oslist"    "linux"
+		}
+	}
+}

toolmanifest.vdf

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+"manifest"
+{
+	"commandline"			"/wrapper run"
+	"commandline_waitforexitandrun"	"/wrapper wait-before-run"
+	"commandline_getnativepath"	"/wrapper get-native-path"
+	"commandline_getcompatpath"	"/wrapper get-compat-path"
+}

wrapper

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+#!/bin/sh
+
+SPC_CFG="$HOME/.config/steamcustomrc"
+COMMANDTYPE=$1
+
+if [ "$COMMANDTYPE" = "wait-before-run" ]; then
+	# env check
+	STEAM_APPID="$SteamGameId"
+
+	# find something valid, first result only
+	CHECK_GAME=$(grep "$STEAM_APPID:" "$SPC_CFG" | head -n 1)
+
+	# nothing found? throw a message...
+	if [ -z "$CHECK_GAME" ]; then
+		notify-send -a "SteamPlay-Custom" \
+			-i "steam" "SteamPlay-Custom" \
+			"AppID $STEAM_APPID has no entry in $SPC_CFG"
+		exit
+	fi
+
+	# run our alternative
+	RUN_GAME=$(echo "$CHECK_GAME" | cut -d ':' -f 2)
+	exec $RUN_GAME
+fi