fix(fujifilm_ratings.lua): improve the script and make it work again

I don't know what changed, but it broke the previous iteration of the script. So I fixed it and improved it a bit.

contrib/fujifilm_ratings.lua

@@ -44,7 +44,7 @@ local script_data = {}
 script_data.metadata = {
   name = "fujifilm_ratings",
   purpose = _("import Fujifilm in-camera ratings"),
-  author = "Ben Mendis <[email protected]>",
+  author = "Ben Mendis <[email protected]> and LucasGGamerM <[email protected]>",
   help = "https://docs.darktable.org/lua/stable/lua.scripts.manual/scripts/contrib/fujifilm_ratings"
 }
 
@@ -54,35 +54,54 @@ script_data.restart = nil -- how to restart the (lib) script after it's been hid
 script_data.show = nil -- only required for libs since the destroy_method only hides them
 
 local function detect_rating(event, image)
-	if not string.match(image.filename, "%.RAF$") and not string.match(image.filename, "%.raf$") then
-		return
-	end
 	if not df.check_if_bin_exists("exiftool") then
 		dt.print_error(_("exiftool not found"))
 		return
 	end
-	local RAF_filename = df.sanitize_filename(tostring(image))
-	local JPEG_filename = string.gsub(RAF_filename, "%.RAF$", ".JPG")
-	local command = "exiftool -Rating " .. JPEG_filename
-	dt.print_log(command)
-	local output = dtsys.io_popen(command)
-	local jpeg_result = output:read("*all")
-	output:close()
-	if string.len(jpeg_result) > 0 then
-		jpeg_result = string.gsub(jpeg_result, "^Rating.*(%d)", "%1")
-		image.rating = tonumber(jpeg_result)
-		dt.print_log("using JPEG rating: " .. jpeg_result)
-		return
+	if string.match(image.filename, "%.JPG$") or string.match(image.filename, "%.jpg$") then
+		local JPEG_filename = df.sanitize_filename(tostring(image))
+		local command = "exiftool -Rating " .. JPEG_filename
+		dt.print_log(command)
+		local output = dtsys.io_popen(command)
+		local jpeg_result = output:read("*all")
+		output:close()
+		if string.len(jpeg_result) > 0 then
+			jpeg_result = string.gsub(jpeg_result, "^Rating.*(%d)", "%1")
+			image.rating = tonumber(jpeg_result)
+			return
+		end
 	end
-	command = "exiftool -Rating " .. RAF_filename
-	dt.print_log(command)
-	output = dtsys.io_popen(command)
-	local raf_result = output:read("*all")
-	output:close()
-	if string.len(raf_result) > 0 then
-		raf_result = string.gsub(raf_result, "^Rating.*(%d)", "%1")
-		image.rating = tonumber(raf_result)
-		dt.print_log("using RAF rating: " .. raf_result)
+
+	if string.match(image.filename, "%.RAF$") or string.match(image.filename, "%.raf$") then
+		local RAF_filename = df.sanitize_filename(tostring(image))
+		local JPEG_filename
+		if string.match(RAF_filename, "%.RAF") then 
+			JPEG_filename = string.gsub(RAF_filename, "%.RAF", ".JPG")
+		elseif string.match(RAF_filename, "%.raf") then
+			JPEG_filename = string.gsub(RAF_filename, "%.raf", ".jpg")
+		end
+		local command = "exiftool -Rating " .. JPEG_filename
+		dt.print_log(command)
+		local output = dtsys.io_popen(command)
+		local jpeg_result = output:read("*all")
+		output:close()
+		if string.len(jpeg_result) > 0 then
+			jpeg_result = string.gsub(jpeg_result, "^Rating.*(%d)", "%1")
+			image.rating = tonumber(jpeg_result)
+			dt.print_log("using JPEG rating: " .. jpeg_result)
+			return
+		end
+
+		command = "exiftool -Rating " .. RAF_filename
+		dt.print_log(command)
+		output = dtsys.io_popen(command)
+		local raf_result = output:read("*all")
+		output:close()
+		if string.len(raf_result) > 0 then
+			raf_result = string.gsub(raf_result, "^Rating.*(%d)", "%1")
+			image.rating = tonumber(raf_result)
+			dt.print_log("using RAF rating: " .. raf_result)
+		end
 	end
 end