Add readme

README.md

@@ -0,0 +1,13 @@
+# Keyboard Backlight CLI
+This essentially is just a CLI that you can install via `cargo` so you can quickly adjust the keyboard backlight of your mac
+
+## Target OS
+I build this for me to use in Asahi linux on the mac because i, for the life of me, couldnt find a ui control for the keyboard backlight.
+
+## How To Use
+1. Download this repo
+2. Go to the directory
+3. Run `cargo build`
+4. Then Run `cargo install --path .`
+5. Run `sudo kbd-bl <value>` anywhere in your terminal to adjust the backlight on the fly
+6. Take a swig of taquila

src/main.rs

@@ -3,23 +3,30 @@ use std::fs;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        println!("ERR: Must provide an argument");
+        return;
+    }
     let value = &args[1];
     let parsed = value.trim().parse::<i32>();
 
     if parsed.is_err() {
-        panic!("Value entered ({}) is not number", value);
+        println!("ERR: Value entered ({}) is not number", value);
+        return;
     }
 
     let parsed_value = parsed.unwrap();
 
     if parsed_value > 255 {
-        panic!("value entered ({}) must be <= 255", value);
+        println!("ERR: value entered ({}) must be <= 255", value);
+        return;
     }
 
     if parsed_value < 0 {
-        panic!("value entered ({}) must be >= 0", value);
+        println!("ERR: value entered ({}) must be >= 0", value);
+        return;
     }
 
     fs::write("/sys/class/leds/kbd_backlight/brightness", value)
-        .expect("Something went wrong writing to file")
+        .expect("Something went wrong writing to file - you may not have elevated privs aka sudo")
 }