Add proton-launch

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/gui/gaming/proton/default.nix

@@ -0,0 +1,17 @@
+{ user, home }:
+{ lib, pkgs, ... }:
+{
+  environment.persistence."/persist/state"."${home}/.local/share/proton" = { };
+
+  home-manager.users.${user}.home.packages = [
+    (pkgs.writeShellApplication {
+      name = "proton-launch";
+      runtimeInputs = with pkgs; [ coreutils ];
+      runtimeEnv = {
+        PROTON = lib.makeSearchPathOutput "steamcompattool" "" [ pkgs.proton-ge-bin ];
+        STEAM_RUN = lib.meta.getExe pkgs.steam-run;
+      };
+      text = builtins.readFile ./proton-launch.sh;
+    })
+  ];
+}

hosts/common/configs/user/gui/gaming/proton/proton-launch.sh

@@ -0,0 +1,15 @@
+if [ "$#" -lt 1 ]; then
+  echo "Usage: $0 <executable-path> [args...]"
+  exit 1
+fi
+
+PROTON_DATA="$HOME/.local/share/proton"
+
+exec="$(realpath "$1")"
+name="$(basename "$exec")"
+mkdir -p "$PROTON_DATA/$name"
+
+export STEAM_COMPAT_DATA_PATH="$PROTON_DATA/$name"
+export STEAM_COMPAT_CLIENT_INSTALL_PATH="$PROTON"
+
+"$STEAM_RUN" "$PROTON/proton" run "$exec" "${@:2}" >/dev/null 2>&1 & disown