run.sh: make BASEDIR usable earlier

Author: arrowmaster

assets/nix/run.sh

@@ -8,7 +8,8 @@
 # 1. Via CLI: Run ./run.sh <path to game> [doorstop arguments] [game arguments]
 # 2. Via config: edit the options below and run ./run.sh without any arguments
 
-# 0 is false, 1 is true
+# Use POSIX-compatible way to get the directory of the executable
+a="/$0"; a=${a%/*}; a=${a#/}; a=${a:-.}; BASEDIR=$(cd "$a" || exit; pwd -P)
 
 # LINUX: name of Unity executable
 # MACOS: name of the .app directory
@@ -18,6 +19,8 @@ executable_name=""
 
 # General Config Options
 
+# 0 is false, 1 is true
+
 # Enable Doorstop?
 enabled="1"
 
@@ -82,9 +85,6 @@ if [ -z "${executable_name}" ] || [ ! -x "${executable_name}" ]; then
     exit 1
 fi
 
-# Use POSIX-compatible way to get the directory of the executable
-a="/$0"; a=${a%/*}; a=${a#/}; a=${a:-.}; BASEDIR=$(cd "$a" || exit; pwd -P)
-
 arch=""
 executable_path=""
 lib_extension=""