Fix bug related to blight and add a feature for brightness (#67)

* Fixed blight returning previous brightness level instead of current

* Interpret the sign of the argument when changing brightness

* Refactor switch case

* Improve sign checking for brightness steps

README.md

@@ -99,9 +99,9 @@ bindsym XF86MonBrightnessUp exec swayosd-client --brightness raise
 # Brightness lower
 bindsym XF86MonBrightnessDown exec swayosd-client --brightness lower
 
-# Brightness raise with custom value
-bindsym XF86MonBrightnessUp  exec swayosd-client --brightness 10
-# Brightness lower with custom value
+# Brightness raise with custom value('+' sign needed)
+bindsym XF86MonBrightnessUp  exec swayosd-client --brightness +10
+# Brightness lower with custom value('-' sign needed)
 bindsym XF86MonBrightnessDown exec swayosd-client --brightness -10
 ```
 

src/brightness_backend/blight.rs

@@ -16,6 +16,7 @@ impl BrightnessBackendConstructor for Blight {
 
 impl BrightnessBackend for Blight {
 	fn get_current(&mut self) -> u32 {
+		self.device.reload();
 		self.device.current()
 	}
 

src/global_utils.rs

@@ -68,9 +68,21 @@ pub(crate) fn handle_application_args(
 			}
 			"brightness" => {
 				let value = child.value().str().unwrap_or("");
+
+				let coef: i32 = match value.get(..1) {
+					Some("+") => 1,
+					Some("-") => -1,
+					_ => 0,
+				};
+
 				match (value, value.parse::<i8>()) {
 					// Parse custom step values
-					(_, Ok(num)) => (ArgTypes::BrightnessSet, Some(num.abs().to_string())),
+					(_, Ok(num)) => match coef {
+						1 => (ArgTypes::BrightnessRaise, Some(num.to_string())),
+						-1 => (ArgTypes::BrightnessLower, Some(num.abs().to_string())),
+						_ => (ArgTypes::BrightnessSet, Some(num.to_string())),
+					},
+
 					("raise", _) => (ArgTypes::BrightnessRaise, None),
 					("lower", _) => (ArgTypes::BrightnessLower, None),
 					(e, _) => {