treewide: more speed = more good

.github/workflows/hotpath-comment.yml

@@ -13,45 +13,37 @@ jobs:
   comment:
     runs-on: ubuntu-latest
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
-    
+
     steps:
       - name: Download profiling results
         uses: actions/download-artifact@v4
         with:
           name: hotpath-results
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id }}
-      
+
       - name: Read PR number
         id: pr
         run: echo "number=$(cat pr_number.txt)" >> $GITHUB_OUTPUT
-      
+
       - name: Setup Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
-      
+
       - name: Install hotpath CLI
         run: cargo install hotpath
-      
+
       - name: Post timing comparison comment
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          hotpath profile-pr \
-            --repo ${{ github.repository }} \
-            --pr-number ${{ steps.pr.outputs.number }} \
-            --head-json head-timing.json \
-            --base-json base-timing.json \
-            --mode timing \
-            --title "⏱️ Hotpath Timing Profile"
-
-      - name: Post allocation comparison comment
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          hotpath profile-pr \
-            --repo ${{ github.repository }} \
-            --pr-number ${{ steps.pr.outputs.number }} \
-            --head-json head-alloc.json \
-            --base-json base-alloc.json \
-            --mode alloc \
-            --title "📊 Hotpath Allocation Profile"
+         run: |
+           hotpath profile-pr \
+             --head-metrics head-timing.json \
+             --base-metrics base-timing.json \
+             --github-token ${{ secrets.GITHUB_TOKEN }} \
+             --pr-number ${{ steps.pr.outputs.number }}
+
+       - name: Post allocation comparison comment
+         run: |
+           hotpath profile-pr \
+             --head-metrics head-alloc.json \
+             --base-metrics base-alloc.json \
+             --github-token ${{ secrets.GITHUB_TOKEN }} \
+             --pr-number ${{ steps.pr.outputs.number }}

Cargo.toml

@@ -14,7 +14,6 @@ path = "src/main.rs"
 [dependencies]
 hotpath = { optional = true, version = "0.6.0" }
 libc    = "0.2.177"
-nix     = { default-features = false, features = [ "fs", "hostname", "feature" ], version = "0.30.1" }
 
 [dev-dependencies]
 criterion = "0.7"

README.md

@@ -43,7 +43,7 @@ on your system: it is pretty _[fast](#benchmarks)_...
 - Fast
 - Really fast
 - Minimal dependencies
-- Tiny binary (~410kb)
+- Tiny binary (~370kb)
 - Actually really fast
 - Cool NixOS logo (other, inferior, distros are not supported)
 - Reliable detection of following info:
@@ -160,7 +160,8 @@ performance regressions.
 
 > [!NOTE]
 > You will need a Nerdfonts patched font installed, and for your terminal
-> emulator to support said font. Microfetch uses nerdfonts glyphs by default.
+> emulator to support said font. Microfetch uses nerdfonts glyphs by default,
+> but this can be changed by [patching the program](#customizing).
 
 Microfetch is packaged in [nixpkgs](https://github.com/nixos/nixpkgs). It can be
 installed by adding `pkgs.microfetch` to your `environment.systemPackages`.

benches/benchmark.rs

@@ -1,5 +1,6 @@
 use criterion::{Criterion, criterion_group, criterion_main};
 use microfetch_lib::{
+  UtsName,
   colors::print_dots,
   desktop::get_desktop_info,
   release::{get_os_pretty_name, get_system_info},
@@ -13,7 +14,7 @@ use microfetch_lib::{
 };
 
 fn main_benchmark(c: &mut Criterion) {
-  let utsname = nix::sys::utsname::uname().expect("lol");
+  let utsname = UtsName::uname().expect("Failed to get uname");
   c.bench_function("user_info", |b| {
     b.iter(|| get_username_and_hostname(&utsname));
   });

nix/package.nix

@@ -20,6 +20,7 @@ in
           (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
           (s + /Cargo.lock)
           (s + /Cargo.toml)
+          (s + /benches)
         ];
       };
 

src/lib.rs

@@ -1,5 +1,45 @@
 pub mod colors;
 pub mod desktop;
 pub mod release;
+pub mod syscall;
 pub mod system;
 pub mod uptime;
+
+use std::mem::MaybeUninit;
+
+/// Wrapper for `libc::utsname` with safe accessor methods
+pub struct UtsName(libc::utsname);
+
+impl UtsName {
+  /// Calls `uname` syscall and returns a `UtsName` wrapper
+  ///
+  /// # Errors
+  /// Returns an error if the uname syscall fails
+  pub fn uname() -> Result<Self, std::io::Error> {
+    let mut uts = MaybeUninit::uninit();
+    if unsafe { libc::uname(uts.as_mut_ptr()) } != 0 {
+      return Err(std::io::Error::last_os_error());
+    }
+    Ok(Self(unsafe { uts.assume_init() }))
+  }
+
+  #[must_use]
+  pub const fn nodename(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.nodename.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn sysname(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.sysname.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn release(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.release.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn machine(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.machine.as_ptr()) }
+  }
+}

src/main.rs

@@ -1,11 +1,14 @@
 mod colors;
 mod desktop;
 mod release;
+mod syscall;
 mod system;
 mod uptime;
 
 use std::io::{Write, stdout};
 
+pub use microfetch_lib::UtsName;
+
 use crate::{
   colors::print_dots,
   desktop::get_desktop_info,
@@ -24,7 +27,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
   if Some("--version") == std::env::args().nth(1).as_deref() {
     println!("Microfetch {}", env!("CARGO_PKG_VERSION"));
   } else {
-    let utsname = nix::sys::utsname::uname()?;
+    let utsname = UtsName::uname()?;
     let fields = Fields {
       user_info:      get_username_and_hostname(&utsname),
       os_name:        get_os_pretty_name()?,

src/release.rs

@@ -1,10 +1,6 @@
-use std::{
-  fmt::Write as _,
-  fs::File,
-  io::{self, Read},
-};
+use std::{fmt::Write as _, io};
 
-use nix::sys::utsname::UtsName;
+use crate::{UtsName, syscall::read_file_fast};
 
 #[must_use]
 #[cfg_attr(feature = "hotpath", hotpath::measure)]
@@ -28,21 +24,46 @@ pub fn get_system_info(utsname: &UtsName) -> String {
 /// Returns an error if `/etc/os-release` cannot be read.
 #[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_os_pretty_name() -> Result<String, io::Error> {
-  // We use a stack-allocated buffer here, which seems to perform MUCH better
-  // than `BufReader`. In hindsight, I should've seen this coming.
-  let mut buffer = String::with_capacity(1024);
-  File::open("/etc/os-release")?.read_to_string(&mut buffer)?;
-
-  for line in buffer.lines() {
-    if let Some(pretty_name) = line.strip_prefix("PRETTY_NAME=") {
-      if let Some(trimmed) = pretty_name
-        .strip_prefix('"')
-        .and_then(|s| s.strip_suffix('"'))
+  // Fast byte-level scanning for PRETTY_NAME=
+  const PREFIX: &[u8] = b"PRETTY_NAME=";
+
+  let mut buffer = [0u8; 1024];
+
+  // Use fast syscall-based file reading
+  let bytes_read = read_file_fast("/etc/os-release", &mut buffer)?;
+  let content = &buffer[..bytes_read];
+
+  let mut offset = 0;
+
+  while offset < content.len() {
+    let remaining = &content[offset..];
+
+    // Find newline or end
+    let line_end = remaining
+      .iter()
+      .position(|&b| b == b'\n')
+      .unwrap_or(remaining.len());
+    let line = &remaining[..line_end];
+
+    if line.starts_with(PREFIX) {
+      let value = &line[PREFIX.len()..];
+
+      // Strip quotes if present
+      let trimmed = if value.len() >= 2
+        && value[0] == b'"'
+        && value[value.len() - 1] == b'"'
       {
-        return Ok(trimmed.to_owned());
-      }
-      return Ok(pretty_name.to_owned());
+        &value[1..value.len() - 1]
+      } else {
+        value
+      };
+
+      // Convert to String - should be valid UTF-8
+      return Ok(String::from_utf8_lossy(trimmed).into_owned());
     }
+
+    offset += line_end + 1;
   }
+
   Ok("Unknown".to_owned())
 }