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perf: pre-allocate strings when reading files

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ErrorNoInternet 2024-08-15 16:43:12 +08:00
commit 407d98f3fa
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2 changed files with 16 additions and 6 deletions
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10
src/release.rs
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@ -1,6 +1,8 @@
use color_eyre::Result; use color_eyre::Result;
use std::fs::read_to_string; use std::{
use std::io; fs::File,
io::{self, Read},
};
pub fn get_system_info() -> nix::Result<String> { pub fn get_system_info() -> nix::Result<String> {
let utsname = nix::sys::utsname::uname()?; let utsname = nix::sys::utsname::uname()?;
@ -13,7 +15,9 @@ pub fn get_system_info() -> nix::Result<String> {
} }
pub fn get_os_pretty_name() -> Result<String, io::Error> { pub fn get_os_pretty_name() -> Result<String, io::Error> {
let os_release_content = read_to_string("/etc/os-release")?; let mut os_release_content = String::with_capacity(1024);
File::open("/etc/os-release")?.read_to_string(&mut os_release_content)?;
let pretty_name = os_release_content let pretty_name = os_release_content
.lines() .lines()
.find(|line| line.starts_with("PRETTY_NAME=")) .find(|line| line.starts_with("PRETTY_NAME="))

12
src/system.rs
View file

@ -1,8 +1,11 @@
use color_eyre::Result; use color_eyre::Result;
use nix::sys::statvfs::statvfs; use nix::sys::statvfs::statvfs;
use std::env; use std::{
use std::io::{self}; env,
fs::File,
io::{self, Read},
};
use crate::colors::{CYAN, GREEN, RED, RESET, YELLOW}; use crate::colors::{CYAN, GREEN, RED, RESET, YELLOW};
@ -45,7 +48,10 @@ pub fn get_memory_usage() -> Result<String, io::Error> {
let mut total_memory_kb = 0.0; let mut total_memory_kb = 0.0;
let mut available_memory_kb = 0.0; let mut available_memory_kb = 0.0;
for line in std::fs::read_to_string("/proc/meminfo")?.lines() { let mut meminfo = String::with_capacity(2048);
File::open("/proc/meminfo")?.read_to_string(&mut meminfo)?;
for line in meminfo.lines() {
let mut split = line.split_whitespace(); let mut split = line.split_whitespace();
let key = split.next().unwrap_or(""); let key = split.next().unwrap_or("");