speeding it up

Cargo.toml

@@ -4,7 +4,7 @@ version = "0.2.0"
 edition = "2021"
 
 [dependencies]
-nix = {version = "0.29", features = ["fs"]}
+nix = {version = "0.29", features = ["fs", "hostname"]}
 color-eyre = { version = "0.6", default-features = false }
 
 [profile.release]
@@ -13,6 +13,3 @@ opt-level = "z"
 lto = true
 codegen-units = 1
 panic = "abort"
-
-
-

src/main.rs

@@ -4,7 +4,7 @@ mod release;
 mod system;
 mod uptime;
 
-use color_eyre::{Report, Result};
+use nix::sys::sysinfo::sysinfo;
 
 use crate::colors::{BLUE, CYAN, RESET};
 use crate::desktop::get_desktop_info;
@@ -32,8 +32,6 @@ fn main() -> Result<(), Report> {
         &memory_usage,
         &storage,
     );
-
-    Ok(())
 }
 
 fn print_system_info(

src/release.rs

@@ -1,38 +1,27 @@
 use color_eyre::Result;
 use std::fs::{self, read_to_string};
-use std::io::{self, Read};
+use std::io;
 
 // Try to detect OS type as accurately as possible and without depending on uname.
 // /etc/os-release should generally imply Linux, and /etc/bsd-release would imply BSD system.
-fn detect_os() -> Result<String, io::Error> {
+fn detect_os() -> Result<&'static str, io::Error> {
     if fs::metadata("/etc/os-release").is_ok() || fs::metadata("/usr/lib/os-release").is_ok() {
-        Ok("Linux".to_string())
+        Ok("Linux")
     } else if fs::metadata("/etc/rc.conf").is_ok() || fs::metadata("/etc/bsd-release").is_ok() {
-        Ok("BSD".to_string())
+        Ok("BSD")
     } else {
-        Ok("Unknown".to_string())
+        Ok("Unknown")
     }
 }
 
-fn get_architecture() -> Result<String, io::Error> {
-    // Read architecture from /proc/sys/kernel/arch
-    let mut arch = String::new();
-    fs::File::open("/proc/sys/kernel/arch")?.read_to_string(&mut arch)?;
-    let arch = arch.trim().to_string();
-    Ok(arch)
-}
-
 pub fn get_system_info() -> Result<String, io::Error> {
     let system = detect_os()?;
 
-    let mut kernel_release = String::new();
-    fs::File::open("/proc/sys/kernel/osrelease")?.read_to_string(&mut kernel_release)?;
-    let kernel_release = kernel_release.trim().to_string();
+    let kernel_release = read_to_string("/proc/sys/kernel/osrelease")?;
+    let kernel_release = kernel_release.trim();
 
-    let mut cpuinfo = String::new();
-    fs::File::open("/proc/cpuinfo")?.read_to_string(&mut cpuinfo)?;
-
-    let architecture = get_architecture()?;
+    let architecture = read_to_string("/proc/sys/kernel/arch")?;
+    let architecture = architecture.trim();
 
     let result = format!("{system} {kernel_release} ({architecture})");
     Ok(result)

src/system.rs

@@ -1,17 +1,15 @@
 use nix::sys::statvfs::statvfs;
+use nix::sys::sysinfo::SysInfo;
 
 use std::env;
-use std::fs::File;
-use std::io::{self, BufRead};
-use std::path::Path;
-use std::process::Command;
+use std::io::{self};
 
 use crate::colors::{CYAN, GREEN, RED, RESET, YELLOW};
 
 pub fn get_username_and_hostname() -> Result<String, io::Error> {
     let username = env::var("USER").unwrap_or_else(|_| "unknown_user".to_string());
-    let output = Command::new("hostname").output()?;
-    let hostname = String::from_utf8_lossy(&output.stdout).trim().to_string();
+    let hostname = nix::unistd::gethostname()?;
+    let hostname = hostname.to_string_lossy();
 
     Ok(format!("{YELLOW}{username}{RED}@{GREEN}{hostname}"))
 }
@@ -34,49 +32,21 @@ pub fn get_root_disk_usage() -> Result<String, io::Error> {
     ))
 }
 
-pub fn get_memory_usage() -> Result<String, io::Error> {
-    fn parse_memory_info() -> Result<(f64, f64), io::Error> {
-        let path = Path::new("/proc/meminfo");
-        let file = File::open(path)?;
-        let reader = io::BufReader::new(file);
-
-        let mut total_memory_kb = 0.0;
-        let mut available_memory_kb = 0.0;
-
-        for line in reader.lines() {
-            let line = line?;
-            if line.starts_with("MemTotal:") {
-                total_memory_kb = line
-                    .split_whitespace()
-                    .nth(1)
-                    .ok_or_else(|| {
-                        io::Error::new(io::ErrorKind::InvalidData, "Failed to parse MemTotal")
-                    })?
-                    .parse::<f64>()
-                    .unwrap_or(0.0);
-            } else if line.starts_with("MemAvailable:") {
-                available_memory_kb = line
-                    .split_whitespace()
-                    .nth(1)
-                    .ok_or_else(|| {
-                        io::Error::new(io::ErrorKind::InvalidData, "Failed to parse MemAvailable")
-                    })?
-                    .parse::<f64>()
-                    .unwrap_or(0.0);
-            }
-        }
+pub fn get_memory_usage(info: SysInfo) -> String {
+    #[inline(always)]
+    fn parse_memory_info(info: SysInfo) -> (f64, f64) {
+        let total_memory_kb = (info.ram_total() / 1024) as f64;
+        let available_memory_kb = (info.ram_unused() / 1024) as f64;
 
         let total_memory_gb = total_memory_kb / (1024.0 * 1024.0);
         let available_memory_gb = available_memory_kb / (1024.0 * 1024.0);
         let used_memory_gb = total_memory_gb - available_memory_gb;
 
-        Ok((used_memory_gb, total_memory_gb))
+        (used_memory_gb, total_memory_gb)
     }
 
-    let (used_memory, total_memory) = parse_memory_info()?;
+    let (used_memory, total_memory) = parse_memory_info(info);
     let percentage_used = (used_memory / total_memory * 100.0).round() as u64;
 
-    Ok(format!(
-        "{used_memory:.2} GiB / {total_memory:.2} GiB ({CYAN}{percentage_used}%{RESET})"
-    ))
+    format!("{used_memory:.2} GiB / {total_memory:.2} GiB ({CYAN}{percentage_used}%{RESET})")
 }

src/uptime.rs

@@ -25,7 +25,7 @@ pub fn get_current() -> Result<String, io::Error> {
     let hours = (total_minutes % (60 * 24)) / 60;
     let minutes = total_minutes % 60;
 
-    let mut parts = Vec::new();
+    let mut parts = Vec::with_capacity(3);
     if days > 0 {
         parts.push(format!("{days} days"));
     }