chore: tag 0.4.11

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I42b59d68cdac17ff60d52a4c25bef4686a6a6964

.github/workflows/hotpath-comment.yml

@@ -0,0 +1,57 @@
+name: Hotpath Comment
+
+on:
+  workflow_run:
+    workflows: ["Hotpath Profile"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+
+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"

.github/workflows/hotpath-profile.yml

@@ -0,0 +1,63 @@
+name: Hotpath Profile
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  profile:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout PR HEAD
+        uses: actions/checkout@v4
+      
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+      
+      - name: Run timing profiling on HEAD
+        env:
+          HOTPATH_JSON: "true"
+        run: |
+          cargo run --features='hotpath' 2>&1 | grep '^{"hotpath_profiling_mode"' > head-timing.json
+      
+      - name: Run allocation profiling on HEAD
+        env:
+          HOTPATH_JSON: "true"
+        run: |
+          cargo run --features='hotpath,hotpath-alloc-count-total' 2>&1 | grep '^{"hotpath_profiling_mode"' > head-alloc.json
+      
+      - name: Checkout base branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.base.sha }}
+      
+      - name: Run timing profiling on base
+        env:
+          HOTPATH_JSON: "true"
+        run: |
+          cargo run --features='hotpath' 2>&1 | grep '^{"hotpath_profiling_mode"' > base-timing.json
+      
+      - name: Run allocation profiling on base
+        env:
+          HOTPATH_JSON: "true"
+        run: |
+          cargo run --features='hotpath,hotpath-alloc-count-total' 2>&1 | grep '^{"hotpath_profiling_mode"' > base-alloc.json
+      
+      - name: Save PR number
+        run: echo "${{ github.event.number }}" > pr_number.txt
+      
+      - name: Upload profiling results
+        uses: actions/upload-artifact@v4
+        with:
+          name: hotpath-results
+          path: |
+            head-timing.json
+            head-alloc.json
+            base-timing.json
+            base-alloc.json
+            pr_number.txt
+          retention-days: 1

.rustfmt.toml

@@ -0,0 +1,26 @@
+condense_wildcard_suffixes   = true
+doc_comment_code_block_width = 80
+edition                      = "2024"               # Keep in sync with Cargo.toml.
+enum_discrim_align_threshold = 60
+force_explicit_abi           = false
+force_multiline_blocks       = true
+format_code_in_doc_comments  = true
+format_macro_matchers        = true
+format_strings               = true
+group_imports                = "StdExternalCrate"
+hex_literal_case             = "Upper"
+imports_granularity          = "Crate"
+imports_layout               = "HorizontalVertical"
+inline_attribute_width       = 60
+match_block_trailing_comma   = true
+max_width                    = 80
+newline_style                = "Unix"
+normalize_comments           = true
+normalize_doc_attributes     = true
+overflow_delimited_expr      = true
+struct_field_align_threshold = 60
+tab_spaces                   = 2
+unstable_features            = true
+use_field_init_shorthand     = true
+use_try_shorthand            = true
+wrap_comments                = true

.taplo.toml

@@ -0,0 +1,13 @@
+[formatting]
+align_entries         = true
+column_width          = 100
+compact_arrays        = false
+reorder_inline_tables = true
+reorder_keys          = true
+
+[[rule]]
+include = [ "**/Cargo.toml" ]
+keys    = [ "package" ]
+
+[rule.formatting]
+reorder_keys = false

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
-name = "microfetch"
-version = "0.4.9"
+name    = "microfetch"
+version = "0.4.11"
 edition = "2024"
 
 [lib]
@@ -12,28 +12,59 @@ name = "microfetch"
 path = "src/main.rs"
 
 [dependencies]
-nix = { version = "0.30", features = ["fs", "hostname", "feature"] }
-libc = "0.2"
+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"
 
+[features]
+hotpath                   = [ "dep:hotpath", "hotpath/hotpath" ]
+hotpath-alloc-bytes-total = [ "hotpath/hotpath-alloc-bytes-total" ]
+hotpath-alloc-count-total = [ "hotpath/hotpath-alloc-count-total" ]
+hotpath-off               = [ "hotpath/hotpath-off" ]
+
 [[bench]]
-name = "benchmark"
 harness = false
+name    = "benchmark"
 
 [profile.dev]
-opt-level = 3
+opt-level = 1
 
 [profile.release]
-strip = true
-opt-level = "s"
-lto = true
 codegen-units = 1
-panic = "abort"
+lto           = true
+opt-level     = "s"
+panic         = "abort"
+strip         = true
 
 [profile.profiler]
-inherits = "release"
-debug = true
+debug           = true
+inherits        = "release"
 split-debuginfo = "unpacked"
-strip = "none"
+strip           = "none"
+
+[lints.clippy]
+complexity = { level = "warn", priority = -1 }
+nursery    = { level = "warn", priority = -1 }
+pedantic   = { level = "warn", priority = -1 }
+perf       = { level = "warn", priority = -1 }
+style      = { level = "warn", priority = -1 }
+
+# The lint groups above enable some less-than-desirable rules, we should manually
+# enable those to keep our sanity.
+absolute_paths                 = "allow"
+arbitrary_source_item_ordering = "allow"
+implicit_return                = "allow"
+missing_docs_in_private_items  = "allow"
+non_ascii_literal              = "allow"
+pattern_type_mismatch          = "allow"
+print_stdout                   = "allow"
+question_mark_used             = "allow"
+similar_names                  = "allow"
+single_call_fn                 = "allow"
+std_instead_of_core            = "allow"
+too_long_first_doc_paragraph   = "allow"
+too_many_lines                 = "allow"
+unused_trait_names             = "allow"

README.md

@@ -1,17 +1,34 @@
+<!-- markdownlint-disable MD013 MD033 MD041 -->
+
 <div align="center">
     <img src="https://deps.rs/repo/github/notashelf/microfetch/status.svg" alt="https://deps.rs/repo/github/notashelf/microfetch">
-    <!-- <img src="https://img.shields.io/github/v/release/notashelf/microfetch?display_name=tag&color=DEA584"> -->
-    <img src="https://img.shields.io/github/stars/notashelf/microfetch?label=stars&color=DEA584">
+    <img src="https://img.shields.io/github/stars/notashelf/microfetch?label=stars&color=DEA584" alt="stars">
 </div>
 
-<h1 align="center">Microfetch</h1>
+<div id="doc-begin" align="center">
+  <h1 id="header">
+    Microfetch
+  </h1>
+  <p>
+    Microscopic fetch tool in Rust, for NixOS systems, with special emphasis on speed
+  </p>
+  <br/>
+  <a href="#synopsis">Synopsis</a><br/>
+  <a href="#features">Features</a> | <a href="#motivation">Motivation</a><br/>
+  <a href="#installation">Installation</a>
+  <br/>
+</div>
 
-Stupidly simple, laughably fast fetch tool. Written in Rust for speed and ease
-of maintainability. Runs in a _fraction of a millisecond_ and displays _most_ of
-the nonsense you'd see posted on r/unixporn or other internet communities. Aims
-to replace [fastfetch](https://github.com/fastfetch-cli/fastfetch) on my
-personal system, but [probably not yours](#customizing). Though, you are more
-than welcome to use it on your system: it's pretty [fast](#benchmarks)...
+## Synopsis
+
+[fastfetch]: https://github.com/fastfetch-cli/fastfetch
+
+Stupidly small and simple, laughably fast and pretty fetch tool. Written in Rust
+for speed and ease of maintainability. Runs in a _fraction of a millisecond_ and
+displays _most_ of the nonsense you'd see posted on r/unixporn or other internet
+communities. Aims to replace [fastfetch] on my personal system, but
+[probably not yours](#customizing). Though, you are more than welcome to use it
+on your system: it is pretty _[fast](#benchmarks)_...
 
 <p align="center">
   <img
@@ -26,6 +43,7 @@ than welcome to use it on your system: it's pretty [fast](#benchmarks)...
 - Fast
 - Really fast
 - Minimal dependencies
+- Tiny binary (~410kb)
 - Actually really fast
 - Cool NixOS logo (other, inferior, distros are not supported)
 - Reliable detection of following info:
@@ -44,39 +62,64 @@ than welcome to use it on your system: it's pretty [fast](#benchmarks)...
 
 ## Motivation
 
-Fastfetch, as its name indicates, a very fast fetch tool written in C, however,
-I am not interested in any of its additional features, such as customization,
-and I very much dislike the defaults. Microfetch is my response to this problem,
-a _very fast_ fetch tool that you would normally write in Bash and put in your
-`~/.bashrc` but actually _really_ fast because it opts-out of all customization
-options provided by Fastfetch, and is written in Rust. Why? Because I can, and
-because I prefer Rust for "structured" Bash scripts.
+Fastfetch, as its name probably hinted, is a very fast fetch tool written in C.
+However, I am not interested in _any_ of its additional features, and I'm not
+interested in its configuration options. Sure I can _configure_ it when I
+dislike the defaults, but how often would I really change the configuration...
 
-I cannot re-iterate it enough, Microfetch is _annoyingly fast_.
+Microfetch is my response to this problem. It is an _even faster_ fetch tool
+that I would've written in Bash and put in my `~/.bashrc` but is _actually_
+incredibly fast because it opts out of all the customization options provided by
+tools such as Fastfetch. Ultimately, it's a small, opinionated binary with a
+nice size that doesn't bother me, and incredible speed. Customization? No thank
+you. I cannot re-iterate it enough, Microfetch is _annoyingly fast_.
+
+The project is written in Rust, which comes at the cost of "bloated" dependency
+trees and the increased build times, but we make an extended effort to keep the
+dependencies minimal and build times managable. The latter is also very easily
+mitigated with Nix's binary cache systems. Since Microfetch is already in
+Nixpkgs, you are recommended to use it to utilize the binary cache properly. The
+usage of Rust _is_ nice, however, since it provides us with incredible tooling
+and a very powerful language that allows for Microfetch to be as fast as
+possible. Sure C could've been used here as well, but do you think I hate
+myself? [^1]
+
+[^1]: Okay, maybe a little bit. One of the future goals of Microfetch is to
+    defer to inline Assembly for the costliest functions, but that's for a
+    future date and until I do that I can pretend to be sane.
 
 ## Benchmarks
 
-The performance may be sometimes influenced by hardware-specific race
-conditions, or even your kernel configuration meaning it may (at times) depend
-on your hardware. However, the overall trend appears to be less than 1.3ms on
-any modern (2015 and after) CPU that I own. Below are the benchmarks with
-Hyperfine on my desktop system. Please note that those benchmarks will not be
-always kept up to date, but I will try to update the numbers as I make
-Microfetch faster.
+Below are the benchmarks that I've used to back up my claims of Microfetch's
+speed. It is fast, it is _very_ fast and that is the point of its existence. It
+_could_ be faster, and it will be. Eventually.
 
-| Command      |    Mean [ms] | Min [ms] | Max [ms] |       Relative | Written by raf? |
-| :----------- | -----------: | -------: | -------: | -------------: | --------------: |
-| `microfetch` |    1.0 ± 0.1 |      0.9 |      1.7 |           1.00 |             yes |
-| `fastfetch`  |   48.6 ± 1.6 |     45.8 |     61.3 |   46.65 ± 4.75 |              no |
-| `pfetch`     |  206.0 ± 4.5 |    198.0 |    241.4 | 197.50 ± 19.53 |              no |
-| `neofetch`   | 689.1 ± 29.1 |    637.7 |    811.2 | 660.79 ± 69.56 |              no |
+At this point in time, the performance may be sometimes influenced by
+hardware-specific race conditions or even your kernel configuration. Which means
+that Microfetch's speed may (at times) depend on your hardware setup. However,
+even with the worst possible hardware I could find in my house, I've achieved a
+nice less-than-1ms invocation time. Which is pretty good. While Microfetch
+_could_ be made faster, we're in the territory of environmental bottlenecks
+given how little Microfetch actually allocates.
 
-As far as I'm concerned, Microfetch is significantly faster than every other
-fetch tool that I have tried. The only downsides of using Rust for the project
-(in exchange for speed and maintainability) is the slightly "bloated" dependency
-trees, and the increased build times. The latter is very easily mitigated with
-Nix's binary cache. Since Microfetch is already in Nixpkgs, you are recommended
-to use it to utilize the binary cache properly
+Below are the actual benchmarks with Hyperfine measured on my Desktop system.
+The benchmarks were performed under medium system load, and may not be the same
+on your system. Please _also_ note that those benchmarks will not be always kept
+up to date, but I will try to update the numbers as I make Microfetch faster.
+
+| Command      |         Mean [µs] | Min [µs] | Max [µs] |       Relative | Written by raf? |
+| :----------- | ----------------: | -------: | -------: | -------------: | --------------: |
+| `microfetch` |      604.4 ± 64.2 |    516.0 |   1184.6 |           1.00 |             Yes |
+| `fastfetch`  | 140836.6 ± 1258.6 | 139204.7 | 143299.4 | 233.00 ± 24.82 |              No |
+| `pfetch`     | 177036.6 ± 1614.3 | 174199.3 | 180830.2 | 292.89 ± 31.20 |              No |
+| `neofetch`   | 406309.9 ± 1810.0 | 402757.3 | 409526.3 | 672.20 ± 71.40 |              No |
+| `nitch`      | 127743.7 ± 1391.7 | 123933.5 | 130451.2 | 211.34 ± 22.55 |              No |
+| `macchina`   |   13603.7 ± 339.7 |  12642.9 |  14701.4 |   22.51 ± 2.45 |              No |
+
+The point stands that Microfetch is significantly faster than every other fetch
+tool I have tried. This is to be expected, of course, since Microfetch is
+designed _explicitly_ for speed and makes some tradeoffs to achieve it's
+signature speed.
 
 ### Benchmarking Individual Functions
 
@@ -87,6 +130,32 @@ To benchmark individual functions, [Criterion.rs] is used. See Criterion's
 [Getting Started Guide] for details or just run `cargo bench` to benchmark all
 features of Microfetch.
 
+### Profiling Allocations and Timing
+
+[Hotpath]: https://github.com/pawurb/hotpath
+
+Microfetch uses [Hotpath] for profiling function execution timing and heap
+allocations. This helps identify performance bottlenecks and track optimization
+progress. It is so effective that thanks to Hotpath, Microfetch has seen a 60%
+reduction in the number of allocations.
+
+To profile timing:
+
+```bash
+HOTPATH_JSON=true cargo run --features=hotpath
+```
+
+To profile allocations:
+
+```bash
+HOTPATH_JSON=true cargo run --features=hotpath,hotpath-alloc-count-total
+```
+
+The JSON output can be analyzed with the `hotpath` CLI tool for detailed
+performance metrics. On pull requests, GitHub Actions automatically profiles
+both timing and allocations, posting comparison comments to help catch
+performance regressions.
+
 ## Installation
 
 > [!NOTE]

benches/benchmark.rs

@@ -1,26 +1,31 @@
 use criterion::{Criterion, criterion_group, criterion_main};
-use microfetch_lib::colors::print_dots;
-use microfetch_lib::desktop::get_desktop_info;
-use microfetch_lib::release::{get_os_pretty_name, get_system_info};
-use microfetch_lib::system::{
-    get_memory_usage, get_root_disk_usage, get_shell, get_username_and_hostname,
+use microfetch_lib::{
+  colors::print_dots,
+  desktop::get_desktop_info,
+  release::{get_os_pretty_name, get_system_info},
+  system::{
+    get_memory_usage,
+    get_root_disk_usage,
+    get_shell,
+    get_username_and_hostname,
+  },
+  uptime::get_current,
 };
-use microfetch_lib::uptime::get_current;
 
 fn main_benchmark(c: &mut Criterion) {
-    let utsname = nix::sys::utsname::uname().expect("lol");
-    c.bench_function("user_info", |b| {
-        b.iter(|| get_username_and_hostname(&utsname));
-    });
-    c.bench_function("os_name", |b| b.iter(get_os_pretty_name));
-    c.bench_function("kernel_version", |b| b.iter(|| get_system_info(&utsname)));
-    c.bench_function("shell", |b| b.iter(get_shell));
+  let utsname = nix::sys::utsname::uname().expect("lol");
+  c.bench_function("user_info", |b| {
+    b.iter(|| get_username_and_hostname(&utsname));
+  });
+  c.bench_function("os_name", |b| b.iter(get_os_pretty_name));
+  c.bench_function("kernel_version", |b| b.iter(|| get_system_info(&utsname)));
+  c.bench_function("shell", |b| b.iter(get_shell));
 
-    c.bench_function("desktop", |b| b.iter(get_desktop_info));
-    c.bench_function("uptime", |b| b.iter(get_current));
-    c.bench_function("memory_usage", |b| b.iter(get_memory_usage));
-    c.bench_function("storage", |b| b.iter(get_root_disk_usage));
-    c.bench_function("colors", |b| b.iter(print_dots));
+  c.bench_function("desktop", |b| b.iter(get_desktop_info));
+  c.bench_function("uptime", |b| b.iter(get_current));
+  c.bench_function("memory_usage", |b| b.iter(get_memory_usage));
+  c.bench_function("storage", |b| b.iter(get_root_disk_usage));
+  c.bench_function("colors", |b| b.iter(print_dots));
 }
 
 criterion_group!(benches, main_benchmark);

flake.lock

@@ -2,11 +2,14 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1754214453,
-        "narHash": "sha256-Q/I2xJn/j1wpkGhWkQnm20nShYnG7TI99foDBpXm1SY=",
+        "lastModified": 1743359643,
+        "narHash": "sha256-RkyJ9a67s0zEIz4O66TyZOIGh4TFZ4dKHKMgnxZCh2I=",
+        "lastModified": 1763381801,
+        "narHash": "sha256-325fR0JmHW7B74/gHPv/S9w1Rfj/M2HniwQFUwdrZ9k=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5b09dc45f24cf32316283e62aec81ffee3c3e376",
+        "rev": "ca77b4bc80e558ce59f2712fdb276f90c0ee309a",
+        "rev": "46931757ea8bdbba25c076697f8e73b8dc39fef5",
         "type": "github"
       },
       "original": {

nix/package.nix

@@ -9,23 +9,29 @@
   inherit (toml) version;
 in
   rustPlatform.buildRustPackage.override {stdenv = stdenvAdapters.useMoldLinker llvm.stdenv;} {
-    RUSTFLAGS = "-C link-arg=-fuse-ld=mold";
-
     inherit pname version;
-
-    src = builtins.path {
-      name = "${pname}-${version}";
-      path = lib.sources.cleanSource ../.;
-    };
+    src = let
+      fs = lib.fileset;
+      s = ../.;
+    in
+      fs.toSource {
+        root = s;
+        fileset = fs.unions [
+          (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
+          (s + /Cargo.lock)
+          (s + /Cargo.toml)
+        ];
+      };
 
     cargoLock.lockFile = ../Cargo.lock;
     enableParallelBuilding = true;
+    env.RUSTFLAGS = "-C link-arg=-fuse-ld=mold";
 
     meta = {
-      description = "A microscopic fetch script in Rust, for NixOS systems";
+      description = "Microscopic fetch script in Rust, for NixOS systems";
       homepage = "https://github.com/NotAShelf/microfetch";
       license = lib.licenses.gpl3Only;
-      maintainers = with lib.maintainers; [NotAShelf];
+      maintainers = [lib.maintainers.NotAShelf];
       mainProgram = "microfetch";
     };
   }

nix/shell.nix

@@ -4,6 +4,7 @@
   rustfmt,
   clippy,
   cargo,
+  taplo,
   rustc,
   rustPlatform,
   gnuplot,
@@ -16,8 +17,9 @@ mkShell {
     rustc
 
     rust-analyzer-unwrapped
-    rustfmt
+    (rustfmt.override {asNightly = true;})
     clippy
+    taplo
 
     gnuplot # For Criterion.rs plots
   ];

src/colors.rs

@@ -1,57 +1,81 @@
-use std::env;
-use std::sync::LazyLock;
+use std::{env, sync::LazyLock};
 
 pub struct Colors {
-    pub reset: &'static str,
-    pub blue: &'static str,
-    pub cyan: &'static str,
-    pub green: &'static str,
-    pub yellow: &'static str,
-    pub red: &'static str,
-    pub magenta: &'static str,
+  pub reset:   &'static str,
+  pub blue:    &'static str,
+  pub cyan:    &'static str,
+  pub green:   &'static str,
+  pub yellow:  &'static str,
+  pub red:     &'static str,
+  pub magenta: &'static str,
 }
 
 impl Colors {
-    const fn new(is_no_color: bool) -> Self {
-        if is_no_color {
-            Self {
-                reset: "",
-                blue: "",
-                cyan: "",
-                green: "",
-                yellow: "",
-                red: "",
-                magenta: "",
-            }
-        } else {
-            Self {
-                reset: "\x1b[0m",
-                blue: "\x1b[34m",
-                cyan: "\x1b[36m",
-                green: "\x1b[32m",
-                yellow: "\x1b[33m",
-                red: "\x1b[31m",
-                magenta: "\x1b[35m",
-            }
-        }
+  const fn new(is_no_color: bool) -> Self {
+    if is_no_color {
+      Self {
+        reset:   "",
+        blue:    "",
+        cyan:    "",
+        green:   "",
+        yellow:  "",
+        red:     "",
+        magenta: "",
+      }
+    } else {
+      Self {
+        reset:   "\x1b[0m",
+        blue:    "\x1b[34m",
+        cyan:    "\x1b[36m",
+        green:   "\x1b[32m",
+        yellow:  "\x1b[33m",
+        red:     "\x1b[31m",
+        magenta: "\x1b[35m",
+      }
     }
+  }
 }
 
 pub static COLORS: LazyLock<Colors> = LazyLock::new(|| {
-    // check for NO_COLOR once at startup
-    let is_no_color = env::var("NO_COLOR").is_ok();
-    Colors::new(is_no_color)
+  // Check for NO_COLOR once at startup
+  let is_no_color = env::var("NO_COLOR").is_ok();
+  Colors::new(is_no_color)
 });
 
+#[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn print_dots() -> String {
-    format!(
-        "{}  {}  {}  {}  {}  {}  {}",
-        COLORS.blue,
-        COLORS.cyan,
-        COLORS.green,
-        COLORS.yellow,
-        COLORS.red,
-        COLORS.magenta,
-        COLORS.reset,
-    )
+  // Pre-calculate capacity: 6 color codes + "  " (glyph + 2 spaces) per color
+  const GLYPH: &str = "";
+  let capacity = COLORS.blue.len()
+    + COLORS.cyan.len()
+    + COLORS.green.len()
+    + COLORS.yellow.len()
+    + COLORS.red.len()
+    + COLORS.magenta.len()
+    + COLORS.reset.len()
+    + (GLYPH.len() + 2) * 6;
+
+  let mut result = String::with_capacity(capacity);
+  result.push_str(COLORS.blue);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.cyan);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.green);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.yellow);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.red);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.magenta);
+  result.push_str(GLYPH);
+  result.push_str("  ");
+  result.push_str(COLORS.reset);
+
+  result
 }

src/desktop.rs

@@ -1,28 +1,37 @@
+use std::fmt::Write;
+
+#[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_desktop_info() -> String {
-    // Retrieve the environment variables and handle Result types
-    let desktop_env = std::env::var("XDG_CURRENT_DESKTOP");
-    let display_backend_result = std::env::var("XDG_SESSION_TYPE");
+  // Retrieve the environment variables and handle Result types
+  let desktop_env = std::env::var("XDG_CURRENT_DESKTOP");
+  let display_backend = std::env::var("XDG_SESSION_TYPE");
 
-    // Capitalize the first letter of the display backend value
-    let mut display_backend = display_backend_result.unwrap_or_default();
-    if let Some(c) = display_backend.as_mut_str().get_mut(0..1) {
-        c.make_ascii_uppercase();
-    }
+  let desktop_str = match desktop_env {
+    Err(_) => "Unknown",
+    Ok(ref s) if s.starts_with("none+") => &s[5..],
+    Ok(ref s) => s.as_str(),
+  };
 
-    // Trim "none+" from the start of desktop_env if present
-    // Use "Unknown" if desktop_env is empty or has an error
-    let desktop_env = match desktop_env {
-        Err(_) => "Unknown".to_string(),
-        Ok(s) => s.trim_start_matches("none+").to_string(),
-    };
+  let backend_str = match display_backend {
+    Err(_) => "Unknown",
+    Ok(ref s) if s.is_empty() => "Unknown",
+    Ok(ref s) => s.as_str(),
+  };
 
-    // Handle the case where display_backend might be empty after capitalization
-    let display_backend = if display_backend.is_empty() {
-        "Unknown"
-    } else {
-        &display_backend
-    }
-    .to_string();
+  // Pre-calculate capacity: desktop_len + " (" + backend_len + ")"
+  // Capitalize first char needs temporary allocation only if backend exists
+  let mut result =
+    String::with_capacity(desktop_str.len() + backend_str.len() + 3);
+  result.push_str(desktop_str);
+  result.push_str(" (");
 
-    format!("{desktop_env} ({display_backend})")
+  // Capitalize first character of backend
+  if let Some(first_char) = backend_str.chars().next() {
+    let _ = write!(result, "{}", first_char.to_ascii_uppercase());
+    result.push_str(&backend_str[first_char.len_utf8()..]);
+  }
+
+  result.push(')');
+  result
 }

src/main.rs

@@ -4,78 +4,90 @@ mod release;
 mod system;
 mod uptime;
 
-use crate::colors::print_dots;
-use crate::desktop::get_desktop_info;
-use crate::release::{get_os_pretty_name, get_system_info};
-use crate::system::{get_memory_usage, get_root_disk_usage, get_shell, get_username_and_hostname};
-use crate::uptime::get_current;
 use std::io::{Write, stdout};
 
-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 fields = Fields {
-            user_info: get_username_and_hostname(&utsname),
-            os_name: get_os_pretty_name()?,
-            kernel_version: get_system_info(&utsname),
-            shell: get_shell(),
-            desktop: get_desktop_info(),
-            uptime: get_current()?,
-            memory_usage: get_memory_usage()?,
-            storage: get_root_disk_usage()?,
-            colors: print_dots(),
-        };
-        print_system_info(&fields)?;
-    }
+use crate::{
+  colors::print_dots,
+  desktop::get_desktop_info,
+  release::{get_os_pretty_name, get_system_info},
+  system::{
+    get_memory_usage,
+    get_root_disk_usage,
+    get_shell,
+    get_username_and_hostname,
+  },
+  uptime::get_current,
+};
 
-    Ok(())
+#[cfg_attr(feature = "hotpath", hotpath::main)]
+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 fields = Fields {
+      user_info:      get_username_and_hostname(&utsname),
+      os_name:        get_os_pretty_name()?,
+      kernel_version: get_system_info(&utsname),
+      shell:          get_shell(),
+      desktop:        get_desktop_info(),
+      uptime:         get_current()?,
+      memory_usage:   get_memory_usage()?,
+      storage:        get_root_disk_usage()?,
+      colors:         print_dots(),
+    };
+    print_system_info(&fields)?;
+  }
+
+  Ok(())
 }
 
 // Struct to hold all the fields we need in order to print the fetch. This
 // helps avoid Clippy warnings about argument count, and makes it slightly
 // easier to pass data around. Though, it is not like we really need to.
 struct Fields {
-    user_info: String,
-    os_name: String,
-    kernel_version: String,
-    shell: String,
-    uptime: String,
-    desktop: String,
-    memory_usage: String,
-    storage: String,
-    colors: String,
+  user_info:      String,
+  os_name:        String,
+  kernel_version: String,
+  shell:          String,
+  uptime:         String,
+  desktop:        String,
+  memory_usage:   String,
+  storage:        String,
+  colors:         String,
 }
 
-fn print_system_info(fields: &Fields) -> Result<(), Box<dyn std::error::Error>> {
-    use crate::colors::COLORS;
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
+fn print_system_info(
+  fields: &Fields,
+) -> Result<(), Box<dyn std::error::Error>> {
+  use crate::colors::COLORS;
 
-    let Fields {
-        user_info,
-        os_name,
-        kernel_version,
-        shell,
-        uptime,
-        desktop,
-        memory_usage,
-        storage,
-        colors,
-    } = fields;
+  let Fields {
+    user_info,
+    os_name,
+    kernel_version,
+    shell,
+    uptime,
+    desktop,
+    memory_usage,
+    storage,
+    colors,
+  } = fields;
 
-    let cyan = COLORS.cyan;
-    let blue = COLORS.blue;
-    let reset = COLORS.reset;
-    let system_info = format!("
-    {cyan}     ▟█▖    {blue}▝█▙ ▗█▛          {user_info} ~{reset}
-    {cyan}  ▗▄▄▟██▄▄▄▄▄{blue}▝█▙█▛  {cyan}▖        {cyan}  {blue}System{reset}        {os_name}
-    {cyan}  ▀▀▀▀▀▀▀▀▀▀▀▘{blue}▝██  {cyan}▟█▖       {cyan}  {blue}Kernel{reset}        {kernel_version}
-    {blue}     ▟█▛       {blue}▝█▘{cyan}▟█▛        {cyan}  {blue}Shell{reset}         {shell}
-    {blue}▟█████▛          {cyan}▟█████▛     {cyan}  {blue}Uptime{reset}        {uptime}
-    {blue}   ▟█▛{cyan}▗█▖       {cyan}▟█▛          {cyan}  {blue}Desktop{reset}       {desktop}
-    {blue}  ▝█▛  {cyan}██▖{blue}▗▄▄▄▄▄▄▄▄▄▄▄       {cyan}  {blue}Memory{reset}        {memory_usage}
-    {blue}   ▝  {cyan}▟█▜█▖{blue}▀▀▀▀▀██▛▀▀▘       {cyan}󱥎  {blue}Storage (/){reset}   {storage}
-    {cyan}     ▟█▘ ▜█▖    {blue}▝█▛          {cyan}  {blue}Colors{reset}        {colors}\n");
+  let cyan = COLORS.cyan;
+  let blue = COLORS.blue;
+  let reset = COLORS.reset;
+  let system_info = format!("
+    {cyan}     ▟█▖    {blue}▝█▙ ▗█▛         {user_info} ~{reset}
+    {cyan}  ▗▄▄▟██▄▄▄▄▄{blue}▝█▙█▛  {cyan}▖       {cyan}  {blue}System{reset}        {os_name}
+    {cyan}  ▀▀▀▀▀▀▀▀▀▀▀▘{blue}▝██  {cyan}▟█▖      {cyan}  {blue}Kernel{reset}        {kernel_version}
+    {blue}     ▟█▛       {blue}▝█▘{cyan}▟█▛       {cyan}  {blue}Shell{reset}         {shell}
+    {blue}▟█████▛          {cyan}▟█████▛    {cyan}  {blue}Uptime{reset}        {uptime}
+    {blue}   ▟█▛{cyan}▗█▖       {cyan}▟█▛         {cyan}  {blue}Desktop{reset}       {desktop}
+    {blue}  ▝█▛  {cyan}██▖{blue}▗▄▄▄▄▄▄▄▄▄▄▄      {cyan}  {blue}Memory{reset}        {memory_usage}
+    {blue}   ▝  {cyan}▟█▜█▖{blue}▀▀▀▀▀██▛▀▀▘      {cyan}󱥎  {blue}Storage (/){reset}   {storage}
+    {cyan}     ▟█▘ ▜█▖    {blue}▝█▛         {cyan}  {blue}Colors{reset}        {colors}\n");
 
-    Ok(stdout().write_all(system_info.as_bytes())?)
+  Ok(stdout().write_all(system_info.as_bytes())?)
 }

src/release.rs

@@ -1,33 +1,48 @@
-use nix::sys::utsname::UtsName;
 use std::{
-    fs::File,
-    io::{self, BufRead, BufReader},
+  fmt::Write as _,
+  fs::File,
+  io::{self, Read},
 };
 
+use nix::sys::utsname::UtsName;
+
+#[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_system_info(utsname: &UtsName) -> String {
-    format!(
-        "{} {} ({})",
-        utsname.sysname().to_str().unwrap_or("Unknown"),
-        utsname.release().to_str().unwrap_or("Unknown"),
-        utsname.machine().to_str().unwrap_or("Unknown")
-    )
+  let sysname = utsname.sysname().to_str().unwrap_or("Unknown");
+  let release = utsname.release().to_str().unwrap_or("Unknown");
+  let machine = utsname.machine().to_str().unwrap_or("Unknown");
+
+  // Pre-allocate capacity: sysname + " " + release + " (" + machine + ")"
+  let capacity = sysname.len() + 1 + release.len() + 2 + machine.len() + 1;
+  let mut result = String::with_capacity(capacity);
+
+  write!(result, "{sysname} {release} ({machine})").unwrap();
+  result
 }
 
+/// Gets the pretty name of the OS from `/etc/os-release`.
+///
+/// # Errors
+///
+/// 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> {
-    let file = File::open("/etc/os-release")?;
-    let reader = BufReader::new(file);
+  // 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 reader.lines() {
-        let line = line?;
-        if let Some(pretty_name) = line.strip_prefix("PRETTY_NAME=") {
-            if let Some(trimmed) = pretty_name
-                .strip_prefix('"')
-                .and_then(|s| s.strip_suffix('"'))
-            {
-                return Ok(trimmed.to_string());
-            }
-            return Ok(pretty_name.to_string());
-        }
+  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('"'))
+      {
+        return Ok(trimmed.to_owned());
+      }
+      return Ok(pretty_name.to_owned());
     }
-    Ok("Unknown".to_string())
+  }
+  Ok("Unknown".to_owned())
 }

src/system.rs

@@ -1,87 +1,137 @@
-use crate::colors::COLORS;
-use nix::sys::{statvfs::statvfs, utsname::UtsName};
 use std::{
-    env,
-    fs::File,
-    io::{self, Read},
+  env,
+  fmt::Write as _,
+  fs::File,
+  io::{self, Read},
 };
 
+use nix::sys::{statvfs::statvfs, utsname::UtsName};
+
+use crate::colors::COLORS;
+
+#[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_username_and_hostname(utsname: &UtsName) -> String {
-    let username = env::var("USER").unwrap_or_else(|_| "unknown_user".to_string());
-    let hostname = utsname
-        .nodename()
-        .to_str()
-        .unwrap_or("unknown_host")
-        .to_string();
-    format!(
-        "{yellow}{username}{red}@{green}{hostname}{reset}",
-        yellow = COLORS.yellow,
-        red = COLORS.red,
-        green = COLORS.green,
-        reset = COLORS.reset,
-    )
+  let username = env::var("USER").unwrap_or_else(|_| "unknown_user".to_owned());
+  let hostname = utsname.nodename().to_str().unwrap_or("unknown_host");
+
+  let capacity = COLORS.yellow.len()
+    + username.len()
+    + COLORS.red.len()
+    + 1
+    + COLORS.green.len()
+    + hostname.len()
+    + COLORS.reset.len();
+  let mut result = String::with_capacity(capacity);
+
+  result.push_str(COLORS.yellow);
+  result.push_str(&username);
+  result.push_str(COLORS.red);
+  result.push('@');
+  result.push_str(COLORS.green);
+  result.push_str(hostname);
+  result.push_str(COLORS.reset);
+
+  result
 }
 
+#[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_shell() -> String {
-    let shell_path = env::var("SHELL").unwrap_or_else(|_| "unknown_shell".to_string());
-    let shell_name = shell_path.rsplit('/').next().unwrap_or("unknown_shell");
-    shell_name.to_string()
+  let shell_path =
+    env::var("SHELL").unwrap_or_else(|_| "unknown_shell".to_owned());
+
+  // Find last '/' and get the part after it, avoiding allocation
+  shell_path
+    .rsplit('/')
+    .next()
+    .unwrap_or("unknown_shell")
+    .to_owned()
 }
 
+/// Gets the root disk usage information.
+///
+/// # Errors
+///
+/// Returns an error if the filesystem information cannot be retrieved.
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
+#[allow(clippy::cast_precision_loss)]
 pub fn get_root_disk_usage() -> Result<String, io::Error> {
-    let vfs = statvfs("/")?;
-    let block_size = vfs.block_size() as u64;
-    let total_blocks = vfs.blocks();
-    let available_blocks = vfs.blocks_available();
+  let vfs = statvfs("/")?;
+  let block_size = vfs.block_size() as u64;
+  let total_blocks = vfs.blocks();
+  let available_blocks = vfs.blocks_available();
 
-    let total_size = block_size * total_blocks;
-    let used_size = total_size - (block_size * available_blocks);
+  let total_size = block_size * total_blocks;
+  let used_size = total_size - (block_size * available_blocks);
 
-    let total_size = total_size as f64 / (1024.0 * 1024.0 * 1024.0);
-    let used_size = used_size as f64 / (1024.0 * 1024.0 * 1024.0);
-    let usage = (used_size / total_size) * 100.0;
+  let total_size = total_size as f64 / (1024.0 * 1024.0 * 1024.0);
+  let used_size = used_size as f64 / (1024.0 * 1024.0 * 1024.0);
+  let usage = (used_size / total_size) * 100.0;
 
-    Ok(format!(
-        "{used_size:.2} GiB / {total_size:.2} GiB ({cyan}{usage:.0}%{reset})",
-        cyan = COLORS.cyan,
-        reset = COLORS.reset,
-    ))
+  let mut result = String::with_capacity(64);
+  write!(
+    result,
+    "{used_size:.2} GiB / {total_size:.2} GiB ({cyan}{usage:.0}%{reset})",
+    cyan = COLORS.cyan,
+    reset = COLORS.reset,
+  )
+  .unwrap();
+
+  Ok(result)
 }
 
+/// Gets the system memory usage information.
+///
+/// # Errors
+///
+/// Returns an error if `/proc/meminfo` cannot be read.
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_memory_usage() -> Result<String, io::Error> {
-    fn parse_memory_info() -> Result<(f64, f64), io::Error> {
-        let mut total_memory_kb = 0.0;
-        let mut available_memory_kb = 0.0;
-        let mut meminfo = String::with_capacity(2048);
+  #[cfg_attr(feature = "hotpath", hotpath::measure)]
+  fn parse_memory_info() -> Result<(f64, f64), io::Error> {
+    let mut total_memory_kb = 0.0;
+    let mut available_memory_kb = 0.0;
+    let mut meminfo = String::with_capacity(2048);
 
-        File::open("/proc/meminfo")?.read_to_string(&mut meminfo)?;
+    File::open("/proc/meminfo")?.read_to_string(&mut meminfo)?;
 
-        for line in meminfo.lines() {
-            let mut split = line.split_whitespace();
-            match split.next().unwrap_or_default() {
-                "MemTotal:" => total_memory_kb = split.next().unwrap_or("0").parse().unwrap_or(0.0),
-                "MemAvailable:" => {
-                    available_memory_kb = split.next().unwrap_or("0").parse().unwrap_or(0.0);
-                    // MemTotal comes before MemAvailable, stop parsing
-                    break;
-                }
-                _ => (),
-            }
-        }
-
-        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))
+    for line in meminfo.lines() {
+      let mut split = line.split_whitespace();
+      match split.next().unwrap_or_default() {
+        "MemTotal:" => {
+          total_memory_kb = split.next().unwrap_or("0").parse().unwrap_or(0.0);
+        },
+        "MemAvailable:" => {
+          available_memory_kb =
+            split.next().unwrap_or("0").parse().unwrap_or(0.0);
+          // MemTotal comes before MemAvailable, stop parsing
+          break;
+        },
+        _ => (),
+      }
     }
 
-    let (used_memory, total_memory) = parse_memory_info()?;
-    let percentage_used = (used_memory / total_memory * 100.0).round() as u64;
+    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(format!(
-        "{used_memory:.2} GiB / {total_memory:.2} GiB ({cyan}{percentage_used}%{reset})",
-        cyan = COLORS.cyan,
-        reset = COLORS.reset,
-    ))
+    Ok((used_memory_gb, total_memory_gb))
+  }
+
+  let (used_memory, total_memory) = parse_memory_info()?;
+  #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
+  let percentage_used = (used_memory / total_memory * 100.0).round() as u64;
+
+  let mut result = String::with_capacity(64);
+  write!(
+    result,
+    "{used_memory:.2} GiB / {total_memory:.2} GiB \
+     ({cyan}{percentage_used}%{reset})",
+    cyan = COLORS.cyan,
+    reset = COLORS.reset,
+  )
+  .unwrap();
+
+  Ok(result)
 }

src/uptime.rs

@@ -1,40 +1,49 @@
-use std::{io, mem::MaybeUninit};
+use std::{fmt::Write, io, mem::MaybeUninit};
 
+/// Gets the current system uptime.
+///
+/// # Errors
+///
+/// Returns an error if the system uptime cannot be retrieved.
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_current() -> Result<String, io::Error> {
-    let uptime_seconds = {
-        let mut info = MaybeUninit::uninit();
-        if unsafe { libc::sysinfo(info.as_mut_ptr()) } != 0 {
-            return Err(io::Error::last_os_error());
-        }
-        unsafe { info.assume_init().uptime as u64 }
-    };
+  let uptime_seconds = {
+    let mut info = MaybeUninit::uninit();
+    if unsafe { libc::sysinfo(info.as_mut_ptr()) } != 0 {
+      return Err(io::Error::last_os_error());
+    }
+    #[allow(clippy::cast_sign_loss)]
+    unsafe {
+      info.assume_init().uptime as u64
+    }
+  };
 
-    let days = uptime_seconds / 86400;
-    let hours = (uptime_seconds / 3600) % 24;
-    let minutes = (uptime_seconds / 60) % 60;
+  let days = uptime_seconds / 86400;
+  let hours = (uptime_seconds / 3600) % 24;
+  let minutes = (uptime_seconds / 60) % 60;
 
-    let mut result = String::with_capacity(32);
-    if days > 0 {
-        result.push_str(&days.to_string());
-        result.push_str(if days == 1 { " day" } else { " days" });
+  let mut result = String::with_capacity(32);
+  if days > 0 {
+    let _ = write!(result, "{days}");
+    result.push_str(if days == 1 { " day" } else { " days" });
+  }
+  if hours > 0 {
+    if !result.is_empty() {
+      result.push_str(", ");
     }
-    if hours > 0 {
-        if !result.is_empty() {
-            result.push_str(", ");
-        }
-        result.push_str(&hours.to_string());
-        result.push_str(if hours == 1 { " hour" } else { " hours" });
-    }
-    if minutes > 0 {
-        if !result.is_empty() {
-            result.push_str(", ");
-        }
-        result.push_str(&minutes.to_string());
-        result.push_str(if minutes == 1 { " minute" } else { " minutes" });
-    }
-    if result.is_empty() {
-        result.push_str("less than a minute");
+    let _ = write!(result, "{hours}");
+    result.push_str(if hours == 1 { " hour" } else { " hours" });
+  }
+  if minutes > 0 {
+    if !result.is_empty() {
+      result.push_str(", ");
     }
+    let _ = write!(result, "{minutes}");
+    result.push_str(if minutes == 1 { " minute" } else { " minutes" });
+  }
+  if result.is_empty() {
+    result.push_str("less than a minute");
+  }
 
-    Ok(result)
+  Ok(result)
 }