Create system_specific_arcade_launching_images.sh

system_specific_arcade_launching_images.sh

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+function custom_arcade_launching_images() {
+    if [[ "$1" != "arcade" ]]; then
+        return
+    fi
+    local emulator="$2"
+    local rom_name="$(basename "$3")"
+    local rom_no_ext="${rom_name%.*}"
+    local arcade_imgs_dir="$HOME/RetroPie/roms/arcade/images"
+    local img_no_ext="$arcade_imgs_dir/$rom_no_ext"
+    local img
+    local config_dir="/opt/retropie/configs"
+    local system
+    local system_img_no_ext
+    local system_img
+    local ext
+
+    # checking if it's mame or fba emulator
+    if grep -q "^$emulator \?=" "$config_dir/mame/emulators.cfg"; then
+        system="mame"
+    elif grep -q "^$emulator \?=" "$config_dir/fba/emulators.cfg"; then
+        system="fba"
+    else
+        return 1 # system not found
+    fi
+
+    # checking if there's a launching image for the respective system
+    system_img_no_ext="$config_dir/$system/launching"
+    for ext in jpg png; do
+        if [[ -f "$system_img_no_ext.$ext" ]]; then
+            system_img="$system_img_no_ext.$ext"
+            break
+        fi
+    done
+    if [[ -z "$system_img" ]]; then
+        return
+    fi
+
+    # checking if the game already has a dedicated launching-image.
+    for ext in jpg png; do
+        if [[ -f "$img_no_ext.$ext" ]]; then
+            img="$img_no_ext.$ext"
+            break
+        fi
+    done
+    # if the image is not a symlink, then do not change it
+    if [[ -f "$img" && ! -L "$img" ]]; then
+        return
+    fi
+
+    # if the file doesn't exists OR is a symbolic link, then we can mess with it
+    rm -f "$img"
+
+    # avoiding duplicated launching images with different extensions
+    ext="${system_img##*.}"
+    case "$ext" in
+        jpg) rm -f "$img_no_ext.png" ;;
+        png) rm -f "$img_no_ext.jpg" ;;
+    esac
+
+    # Phew! We're finally ready to create the symbolic link!
+    ln -s "$system_img" "$img_no_ext.$ext"
+}
+
+custom_arcade_launching_images "$@"