Add barebones config for haptic length

src/main.rs

@@ -1,4 +1,4 @@
-use std::{path::{Path, PathBuf}, fs::{File, OpenOptions}, process::exit};
+use std::{path::{Path}, fs::{File, OpenOptions}};
 use std::io::{Read, Write};
 use clap::Parser;
 use regex::Regex;
@@ -11,13 +11,27 @@ const HAPTIC_PATH: &str = "/sys/class/timed_output/vibrator/enable";
 #[command(version, about, long_about = None)]
 struct Args {
     /// vibration duration in milliseconds
-    #[arg(short, long, default_value_t = 50)]
+    #[arg(short, long, default_value_t = String::from("/etc/kb-haptic-length"))]
-    length: usize,
+    config_path: String,
 }
 
 fn main() {
     let cli = Args::parse();
 
+    let haptic_length: String = {
+        let mut str = String::new();
+        
+        match File::open(&Path::new(&cli.config_path)) {
+            Ok(mut f) => match f.read_to_string(&mut str) {
+                Ok(_) => (),
+                Err(_) => { str.push_str("50"); }
+            }
+            _ => { str.push_str("50"); }
+        }
+
+        str
+    };
+    
     let mut haptic = OpenOptions::new()
         .append(true)
         .open(HAPTIC_PATH)
@@ -39,7 +53,7 @@ fn main() {
     loop {
         for event in device.fetch_events().unwrap() {
             if let EventSummary::Key(_, _, 1) = event.destructure() {
-                match write!(haptic, "{}", cli.length) {
+                match write!(haptic, "{}", haptic_length) {
                     Err(_) => println!("Unable to write to haptics!"),
                     _ => ()
                 };