simplify running SMAPI without a terminal on Linux/macOS

docs/release-notes.md

@@ -4,6 +4,7 @@
 ## Upcoming release
 * For players:
   * Fixed outdated instructions in Steam error message.
+  * Simplified [running without a terminal on Linux/macOS](https://stardewvalleywiki.com/Modding:Player_Guide/Troubleshooting#SMAPI_doesn.27t_recognize_controller_.28Steam_only.29) when needed.
   * Updated compatibility list.
 
 * For the web UI:

src/SMAPI.Installer/assets/unix-launcher.sh

@@ -6,6 +6,10 @@
 # move to script's directory
 cd "$(dirname "$0")" || exit $?
 
+# change to true to skip opening a terminal
+# This isn't recommended since you won't see errors, warnings, and update alerts.
+SKIP_TERMINAL=false
+
 
 ##########
 ## Open terminal if needed
@@ -16,7 +20,6 @@ cd "$(dirname "$0")" || exit $?
 if [ "$(uname)" == "Darwin" ]; then
     if [ ! -t 1 ]; then # https://stackoverflow.com/q/911168/262123
         # sanity check to make sure we don't have an infinite loop of opening windows
-        SKIP_TERMINAL=false
         for argument in "$@"; do
             if [ "$argument" == "--no-reopen-terminal" ]; then
                 SKIP_TERMINAL=true
@@ -63,6 +66,8 @@ else
     LAUNCH_FILE="./StardewModdingAPI"
     export LAUNCH_FILE
 
+    # run in terminal
+    if [ "$SKIP_TERMINAL" == "false" ]; then
         # select terminal (prefer xterm for best compatibility, then known supported terminals)
         for terminal in xterm gnome-terminal kitty terminator xfce4-terminal konsole terminal termite alacritty mate-terminal x-terminal-emulator; do
             if command -v "$terminal" 2>/dev/null; then
@@ -123,4 +128,9 @@ else
                 exec $LAUNCH_FILE --no-terminal "$@"
             fi
         fi
+
+    # explicitly run without terminal
+    else
+        exec $LAUNCH_FILE --no-terminal "$@"
+    fi
 fi