performance improvements

src/main.rs

@@ -5,6 +5,7 @@ use device_query::{DeviceQuery, DeviceState, Keycode};
 use std::sync::mpsc;
 use clap::Parser;
 use colored::Colorize;
+use std::io::{stdout, Write};
 
 /// Search for a pattern in a file and display the lines that contain it.
 #[derive(Parser)]
@@ -27,11 +28,12 @@ macro_rules! either {
     }
 }
 fn main() {
+    let mut lock = stdout().lock(); // obtain std::out lock
     let args = Cli::parse();
     if args.autoscroll {
-        println!("Autoscroll is enabled!")
+        writeln!(lock, "Autoscroll is enabled!").unwrap();
     }
-    print!("Use the up/down arrow keys to adjust the update speed!\nleft/right controls the scroll direction!\nPlease enter a string: ");
+    write!(lock, "Use the up/down arrow keys to adjust the update speed!\nleft/right controls the scroll direction!\nPlease enter a string: ").unwrap();
     let mut input: String = read!("{}\n");
     // check the final character, add a space if there isn't one.
     if input.chars().nth(input.len()) != Some(' ') {
@@ -77,7 +79,7 @@ fn main() {
     // main thread
     let mut polling_rate = initial_polling_rate;
     let mut scroll_left = initial_scroll_left;
-    let mut send_status = String::new();
+    let mut send_status = "N/A".to_string();
     loop {
         // Get data from the polling thread
         match rx.try_recv() {
@@ -114,7 +116,7 @@ fn main() {
                 }
             }
         }
-        print!("i: {}, com buf status: {}, upd: {}ms, scrll: {}, {}\r\n", {i +=1; i}, send_status, polling_rate, either!(scroll_left => "L"; "R"), input);
+        write!(lock, "i: {}, com buf status: {}, upd: {}ms, scrll: {}, {}\r\n", {i +=1; i}, send_status, polling_rate, either!(scroll_left => "L"; "R"), input).unwrap();
         // Scroll text
         if scroll_left {
             input = shift_left(input);
@@ -141,7 +143,6 @@ fn shift_right(mut input: String) -> String {
 fn detect_keys(keys: Vec<Keycode>, mut polling_rate: u64, mut scroll_left: bool) -> (bool, u64, bool) {
     let mut user_update = false;
     //detecting keydown events
-    //println!("{} {} ", polling_rate, scroll_left);
     if keys.is_empty() {
         return (user_update, polling_rate, scroll_left);
     }