NotAShelf/microfetch
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micro optimizations (#8)

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* perf: break early after parsing required meminfo

Also a match statement for compiler magic.

* perf: pre-allocate strings when reading files

* refactor: remove duplicate .to_string()

* perf: try to print everything in one syscall

println! sends a syscall for each line.

* perf: get rid of duplicate uname syscall

* perf: simplify first letter capitalization

* refactor: directly use key in match statement
This commit is contained in:
Ryan 2024-08-15 18:32:02 +08:00 • committed by GitHub
commit 907112f2d1
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4 changed files with 52 additions and 42 deletions
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22
src/release.rs
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@ -1,9 +1,11 @@
use color_eyre::Result;
use std::fs::read_to_string;
use std::io;
use nix::sys::utsname::UtsName;
use std::{
fs::File,
io::{self, Read},
};
pub fn get_system_info() -> nix::Result<String> {
let utsname = nix::sys::utsname::uname()?;
pub fn get_system_info(utsname: &UtsName) -> nix::Result<String> {
Ok(format!(
"{} {} ({})",
utsname.sysname().to_str().unwrap_or("Unknown"),
@ -13,15 +15,13 @@ pub fn get_system_info() -> nix::Result<String> {
}
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
.lines()
.find(|line| line.starts_with("PRETTY_NAME="))
.map(|line| {
line.trim_start_matches("PRETTY_NAME=")
.trim_matches('"')
.to_string()
});
.map(|line| line.trim_start_matches("PRETTY_NAME=").trim_matches('"'));
Ok(pretty_name.unwrap_or("Unknown".to_string()))
Ok(pretty_name.unwrap_or("Unknown").to_string())
}