diff --git a/.cargo/config.toml b/.cargo/config.toml new file mode 100644 index 0000000..b7efcee --- /dev/null +++ b/.cargo/config.toml @@ -0,0 +1,4 @@ +# https://github.com/rui314/mold?tab=readme-ov-file#how-to-use +[target.'cfg(target_os = "linux")'] +linker = "clang" +rustflags = ["-C", "link-arg=-fuse-ld=mold"] diff --git a/.github/dependabot.yml b/.github/dependabot.yml new file mode 100644 index 0000000..a1067c4 --- /dev/null +++ b/.github/dependabot.yml @@ -0,0 +1,14 @@ +version: 2 +updates: + # Update Cargo deps + - package-ecosystem: cargo + directory: "/" + schedule: + interval: "weekly" + + # Update used workflows + - package-ecosystem: github-actions + directory: "/" + schedule: + interval: daily + diff --git a/.github/workflows/hotpath-comment.yml b/.github/workflows/hotpath-comment.yml new file mode 100644 index 0000000..ebeb924 --- /dev/null +++ b/.github/workflows/hotpath-comment.yml @@ -0,0 +1,62 @@ +name: hotpath-comment + +on: + workflow_run: + workflows: ["hotpath-profile"] + types: + - completed + +permissions: + contents: read + pull-requests: write + +jobs: + comment: + runs-on: ubuntu-latest + if: ${{ github.event.workflow_run.conclusion == 'success' }} + + steps: + - name: Checkout + uses: actions/checkout@v6 + + - name: Download profiling results + uses: actions/download-artifact@v6 + with: + name: hotpath-results + path: /tmp/ + github-token: ${{ secrets.GITHUB_TOKEN }} + run-id: ${{ github.event.workflow_run.id }} + + - 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: + GH_TOKEN: ${{ github.token }} + run: | + set -euo pipefail + HEAD_METRICS=$(cat /tmp/head_timing.json) + BASE_METRICS=$(cat /tmp/base_timing.json) + PR_NUMBER=$(cat /tmp/pr_number.txt) + hotpath profile-pr \ + --head-metrics "$HEAD_METRICS" \ + --base-metrics "$BASE_METRICS" \ + --github-token "$GH_TOKEN" \ + --pr-number "$PR_NUMBER" + + - name: Post allocation comparison comment + env: + GH_TOKEN: ${{ github.token }} + run: | + set -euo pipefail + HEAD_METRICS=$(cat /tmp/head_alloc.json) + BASE_METRICS=$(cat /tmp/base_alloc.json) + PR_NUMBER=$(cat /tmp/pr_number.txt) + hotpath profile-pr \ + --head-metrics "$HEAD_METRICS" \ + --base-metrics "$BASE_METRICS" \ + --github-token "$GH_TOKEN" \ + --pr-number "$PR_NUMBER" diff --git a/.github/workflows/hotpath-profile.yml b/.github/workflows/hotpath-profile.yml new file mode 100644 index 0000000..eeca3ec --- /dev/null +++ b/.github/workflows/hotpath-profile.yml @@ -0,0 +1,65 @@ +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@v6 + with: + fetch-depth: 0 + + - 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"' > /tmp/head_timing.json + + - name: Run allocation profiling on HEAD + env: + HOTPATH_JSON: "true" + run: | + cargo run --features='hotpath,hotpath-alloc' 2>&1 | grep '^{"hotpath_profiling_mode"' > /tmp/head_alloc.json + + - name: Checkout base branch + run: | + git checkout ${{ github.event.pull_request.base.sha }} + + - name: Run timing profiling on base + env: + HOTPATH_JSON: "true" + run: | + cargo run --features='hotpath' 2>&1 | grep '^{"hotpath_profiling_mode"' > /tmp/base_timing.json || echo '{}' > /tmp/base_timing.json + + - name: Run allocation profiling on base + env: + HOTPATH_JSON: "true" + run: | + cargo run --features='hotpath,hotpath-alloc' 2>&1 | grep '^{"hotpath_profiling_mode"' > /tmp/base_alloc.json || echo '{}' > /tmp/base_alloc.json + + - name: Save PR number + run: | + echo '${{ github.event.pull_request.number }}' > /tmp/pr_number.txt + + - name: Upload profiling results + uses: actions/upload-artifact@v5 + with: + name: hotpath-results + path: | + /tmp/head_timing.json + /tmp/head_alloc.json + /tmp/base_timing.json + /tmp/base_alloc.json + /tmp/pr_number.txt + retention-days: 1 diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml index e87e1da..5f435fb 100644 --- a/.github/workflows/rust.yml +++ b/.github/workflows/rust.yml @@ -10,12 +10,45 @@ env: CARGO_TERM_COLOR: always jobs: - build: - - runs-on: ubuntu-latest + test: + name: Test on ${{ matrix.target }} + runs-on: ${{ matrix.os }} + strategy: + fail-fast: false + matrix: + include: + - os: ubuntu-latest + target: x86_64-unknown-linux-gnu + - os: ubuntu-latest + target: aarch64-unknown-linux-gnu steps: - name: "Checkout" - uses: actions/checkout@v4 - - name: "Build with Cargo" - run: cargo build --verbose + uses: actions/checkout@v6 + + - name: "Setup Rust toolchain" + uses: actions-rust-lang/setup-rust-toolchain@v1 + with: + target: ${{ matrix.target }} + + - name: "Install cross-compilation tools" + if: matrix.target == 'aarch64-unknown-linux-gnu' + run: | + sudo apt-get update + sudo apt-get install -y gcc-aarch64-linux-gnu + + - name: "Configure linker for aarch64" + if: matrix.target == 'aarch64-unknown-linux-gnu' + run: | + mkdir -p .cargo + cat >> .cargo/config.toml << EOF + [target.aarch64-unknown-linux-gnu] + linker = "aarch64-linux-gnu-gcc" + EOF + + - name: "Build" + run: cargo build --verbose --target ${{ matrix.target }} + + - name: "Run tests" + if: matrix.target == 'x86_64-unknown-linux-gnu' + run: cargo test --verbose --target ${{ matrix.target }} diff --git a/.gitignore b/.gitignore index 8ea0ee8..8799178 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,3 @@ /target result* +/.direnv diff --git a/.rustfmt.toml b/.rustfmt.toml new file mode 100644 index 0000000..9d5c77e --- /dev/null +++ b/.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 diff --git a/.taplo.toml b/.taplo.toml new file mode 100644 index 0000000..5a6456b --- /dev/null +++ b/.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 diff --git a/Cargo.lock b/Cargo.lock index c6cfc69..49e7cf4 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2,6 +2,12 @@ # It is not intended for manual editing. version = 4 +[[package]] +name = "adler2" +version = "2.0.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa" + [[package]] name = "aho-corasick" version = "1.1.3" @@ -11,24 +17,95 @@ dependencies = [ "memchr", ] +[[package]] +name = "alloca" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e5a7d05ea6aea7e9e64d25b9156ba2fee3fdd659e34e41063cd2fc7cd020d7f4" +dependencies = [ + "cc", +] + [[package]] name = "anes" version = "0.1.6" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299" +[[package]] +name = "anstream" +version = "0.6.21" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a" +dependencies = [ + "anstyle", + "anstyle-parse", + "anstyle-query", + "anstyle-wincon", + "colorchoice", + "is_terminal_polyfill", + "utf8parse", +] + [[package]] name = "anstyle" version = "1.0.10" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "55cc3b69f167a1ef2e161439aa98aed94e6028e5f9a59be9a6ffb47aef1651f9" +[[package]] +name = "anstyle-parse" +version = "0.2.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2" +dependencies = [ + "utf8parse", +] + +[[package]] +name = "anstyle-query" +version = "1.1.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc" +dependencies = [ + "windows-sys 0.61.2", +] + +[[package]] +name = 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"syn", +] diff --git a/Cargo.toml b/Cargo.toml index f20ff00..0c70446 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -1,6 +1,6 @@ [package] -name = "microfetch" -version = "0.4.9" +name = "microfetch" +version = "0.4.12" edition = "2024" [lib] @@ -12,28 +12,57 @@ name = "microfetch" path = "src/main.rs" [dependencies] -nix = { version = "0.30", features = ["fs", "hostname", "feature"] } -libc = "0.2" +hotpath = { optional = true, version = "0.8.0" } +libc = "0.2.178" [dev-dependencies] -criterion = "0.6" +criterion = "0.8.1" + +[features] +hotpath = [ "dep:hotpath", "hotpath/hotpath" ] +hotpath-alloc = [ "hotpath/hotpath-alloc" ] +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" diff --git a/README.md b/README.md index 28d6338..8f59640 100644 --- a/README.md +++ b/README.md @@ -1,17 +1,30 @@ + +
https://deps.rs/repo/github/notashelf/microfetch - - + stars
-

Microfetch

+
+

Microfetch

+

Microscopic fetch tool in Rust, for NixOS systems, with special emphasis on speed

+
+ Synopsis
+ Features | Motivation
| Benchmarks
+ Installation +
+
-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)_...

[!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`. @@ -124,17 +204,31 @@ You can't. ### Why? -Customization, of any kind, is expensive: I could try reading environment -variables, parse command-line arguments or read a configuration file but all of -those increment execution time and resource consumption by a lot. +Customization, of most kinds, are expensive: I could try reading environment +variables, parse command-line arguments or read a configuration file to allow +configuring various fields but those inflate execution time and the resource +consumption by a lot. Since Microfetch is closer to a code golf challenge than a +program that attempts to fill a gap, I have elected not to make this trade. ### Really? -To be fair, you _can_ customize Microfetch by, well, patching it. It's not the -best way per se, but it will be the only way that does not compromise on speed. +[main module]: ./src/main.rs +[discussions tab]: https://github.com/NotAShelf/microfetch/discussions + +To be fair, you _can_ customize Microfetch by, well, patching it. It is +certainly not the easiest way of doing so but if you are planning to change +something in Microfetch, patching is the best way to go. It will also the only +way that does not compromise on speed, unless you patch in bad code. Various +users have adapted Microfetch to their distribution by patching the +[main module] and inserting the logo of their choice. This is also the best way +to go if you plan to make small changes. If your changes are not small, you +might want to look for a program that is designed to be customizable; Microfetch +is built for maximum performance. The Nix package allows passing patches in a streamlined manner by passing -`.overrideAttrs` to the derivation. +`.overrideAttrs` to the derivation. You can apply your patches in `patches` and +share your derivations with people. Feel free to use the [discussions tab] to +share your own variants of Microfetch! ## Contributing @@ -146,13 +240,22 @@ Contributions that help improve performance in specific areas of Microfetch are welcome. Though, prepare to be bombarded with questions if your changes are large. -## Hacking +### Hacking -A Nix flake is provided. `nix develop` to get started. Direnv users may simply -run `direnv allow` to get started. +A Nix flake is provided. You may use `nix develop` to get started. Direnv users +may instead run `direnv allow` to get a complete environment with shell +integration. -Non-nix users will need `cargo` and `gcc` installed on their system, see -`Cargo.toml` for available release profiles. +Non-Nix user will need `cargo`, `clang` and `mold` installed on their system to +build Microfetch. As Mold seems to yield _slightly_ better results than the +default linker, it has been set as the default in `.cargo/config.toml` for +x86-64 Linux. You may override those defaults using the `RUSTFLAGS` environment +variable. For example: + +```sh +# Use ld instead of Mold +$ RUSTFLAGS="-C linker=/path/to/ld.lld" cargo build +``` ## Thanks @@ -169,6 +272,7 @@ person about current issues. To list a few, special thanks to: - [@sioodmy](https://github.com/sioodmy) - Being cute - [@mewoocat](https://github.com/mewoocat) - The awesome NixOS logo ASCII used in Microfetch +- [@uzaaft](https://github.com/uzaaft) - Helping me going faster Additionally a big thank you to everyone who used, talked about or criticized Microfetch. I might have missed your name here, but you have my thanks. diff --git a/benches/benchmark.rs b/benches/benchmark.rs index 03e49f4..8d62082 100644 --- a/benches/benchmark.rs +++ b/benches/benchmark.rs @@ -1,26 +1,32 @@ 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::{ + UtsName, + 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 = UtsName::uname().expect("Failed to get uname"); + 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); diff --git a/flake.lock b/flake.lock index d831dac..452a532 100644 --- a/flake.lock +++ b/flake.lock @@ -4,13 +4,17 @@ "locked": { "lastModified": 1743359643, "narHash": "sha256-RkyJ9a67s0zEIz4O66TyZOIGh4TFZ4dKHKMgnxZCh2I=", + "lastModified": 1763381801, + "narHash": "sha256-325fR0JmHW7B74/gHPv/S9w1Rfj/M2HniwQFUwdrZ9k=", "owner": "NixOS", "repo": "nixpkgs", "rev": "ca77b4bc80e558ce59f2712fdb276f90c0ee309a", + "rev": "46931757ea8bdbba25c076697f8e73b8dc39fef5", "type": "github" }, "original": { "owner": "NixOS", + "ref": "nixos-unstable", "repo": "nixpkgs", "type": "github" } diff --git a/flake.nix b/flake.nix index a481c30..90978a2 100644 --- a/flake.nix +++ b/flake.nix @@ -1,6 +1,6 @@ { description = "A microscopic fetch script in Rust, for NixOS systems"; - inputs.nixpkgs.url = "github:NixOS/nixpkgs"; + inputs.nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable"; outputs = { self, @@ -10,9 +10,12 @@ forEachSystem = nixpkgs.lib.genAttrs systems; pkgsForEach = nixpkgs.legacyPackages; in { - packages = forEachSystem (system: { + packages = forEachSystem (system: let + pkgs = pkgsForEach.${system}; + in { default = self.packages.${system}.microfetch; - microfetch = pkgsForEach.${system}.callPackage ./nix/package.nix {}; + microfetch = pkgs.callPackage ./nix/package.nix {}; + microfetch-mold = pkgs.callPackage ./nix/package.nix {useMold = true;}; }); devShells = forEachSystem (system: { diff --git a/nix/package.nix b/nix/package.nix index 506aea3..052f576 100644 --- a/nix/package.nix +++ b/nix/package.nix @@ -1,31 +1,53 @@ { lib, - rustPlatform, + stdenv, stdenvAdapters, + rustPlatform, llvm, + useMold ? stdenv.isLinux && !stdenv.hostPlatform.isAarch, }: let toml = (lib.importTOML ../Cargo.toml).package; pname = toml.name; inherit (toml) version; + + # Select stdenv based on useMold flag + stdenv = + if useMold + then stdenvAdapters.useMoldLinker llvm.stdenv + else llvm.stdenv; in - rustPlatform.buildRustPackage.override {stdenv = stdenvAdapters.useMoldLinker llvm.stdenv;} { - RUSTFLAGS = "-C link-arg=-fuse-ld=mold"; - + rustPlatform.buildRustPackage.override {inherit stdenv;} { inherit pname version; - - src = builtins.path { - name = "${pname}-${version}"; - path = lib.sources.cleanSource ../.; - }; + src = let + fs = lib.fileset; + s = ../.; + in + fs.toSource { + root = s; + fileset = fs.unions [ + (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src)) + (s + /Cargo.lock) + (s + /Cargo.toml) + (s + /benches) + ]; + }; cargoLock.lockFile = ../Cargo.lock; enableParallelBuilding = true; + buildNoDefaultFeatures = true; + doCheck = false; + + # Only set RUSTFLAGS for mold if useMold is enabled + env = lib.optionalAttrs useMold { + CARGO_LINKER = "clang"; + RUSTFLAGS = "-C link-arg=-fuse-ld=mold"; + }; meta = { - description = "A microscopic fetch script in Rust, for NixOS systems"; + description = "Microscopic fetch script in Rust, for NixOS systems"; homepage = "https://github.com/NotAShelf/microfetch"; license = lib.licenses.gpl3Only; - maintainers = with lib.maintainers; [NotAShelf]; + maintainers = [lib.maintainers.NotAShelf]; mainProgram = "microfetch"; }; } diff --git a/nix/shell.nix b/nix/shell.nix index 0577a0a..ae65e10 100644 --- a/nix/shell.nix +++ b/nix/shell.nix @@ -1,25 +1,31 @@ { mkShell, + cargo, + rustc, + mold, + clang, rust-analyzer-unwrapped, rustfmt, clippy, - cargo, - rustc, + taplo, rustPlatform, gnuplot, }: mkShell { + name = "microfetch"; strictDeps = true; - nativeBuildInputs = [ cargo rustc + mold + clang rust-analyzer-unwrapped - rustfmt + (rustfmt.override {asNightly = true;}) clippy + taplo - gnuplot # For Criterion.rs plots + gnuplot # for Criterion.rs plots ]; env.RUST_SRC_PATH = "${rustPlatform.rustLibSrc}"; diff --git a/src/colors.rs b/src/colors.rs index da613a5..7c65944 100644 --- a/src/colors.rs +++ b/src/colors.rs @@ -1,57 +1,81 @@ -use std::env; use std::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 = LazyLock::new(|| { - // check for NO_COLOR once at startup - let is_no_color = env::var("NO_COLOR").is_ok(); - Colors::new(is_no_color) + const NO_COLOR: *const libc::c_char = c"NO_COLOR".as_ptr(); + let is_no_color = unsafe { !libc::getenv(NO_COLOR).is_null() }; + 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 } diff --git a/src/desktop.rs b/src/desktop.rs index f35cd2a..501e967 100644 --- a/src/desktop.rs +++ b/src/desktop.rs @@ -1,28 +1,42 @@ +use std::{ffi::CStr, 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"); - - // 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(); - } - - // 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(), - }; - - // Handle the case where display_backend might be empty after capitalization - let display_backend = if display_backend.is_empty() { - "Unknown" + // Retrieve the environment variables and handle Result types + let desktop_str = unsafe { + let ptr = libc::getenv(c"XDG_CURRENT_DESKTOP".as_ptr()); + if ptr.is_null() { + "Unknown" } else { - &display_backend + let s = CStr::from_ptr(ptr).to_str().unwrap_or("Unknown"); + s.strip_prefix("none+").unwrap_or(s) } - .to_string(); + }; - format!("{desktop_env} ({display_backend})") + let backend_str = unsafe { + let ptr = libc::getenv(c"XDG_SESSION_TYPE".as_ptr()); + if ptr.is_null() { + "Unknown" + } else { + let s = CStr::from_ptr(ptr).to_str().unwrap_or("Unknown"); + if s.is_empty() { "Unknown" } else { s } + } + }; + + // 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(" ("); + + // 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 } diff --git a/src/lib.rs b/src/lib.rs index 4ba33f8..1e0f9f3 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,5 +1,46 @@ 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 { + 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()) } + } +} diff --git a/src/main.rs b/src/main.rs index 41a1818..e29d6d1 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,82 +1,112 @@ mod colors; mod desktop; mod release; +mod syscall; 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}; +use std::io::{self, Cursor, Write}; +pub use microfetch_lib::UtsName; + +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, +}; + +#[cfg_attr(feature = "hotpath", hotpath::main)] fn main() -> Result<(), Box> { - 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)?; - } + if Some("--version") == std::env::args().nth(1).as_deref() { + println!("Microfetch {}", env!("CARGO_PKG_VERSION")); + } else { + let utsname = 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(()) + Ok(()) } -// Struct to hold all the fields we need to print -// helps avoid clippy warnings about argument count -// and makes it easier to pass around, though its -// not like we need to +// 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> { - use crate::colors::COLORS; +#[cfg_attr(feature = "hotpath", hotpath::measure)] +fn print_system_info( + fields: &Fields, +) -> Result<(), Box> { + 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; - Ok(stdout().write_all(system_info.as_bytes())?) + let mut buf = [0u8; 2048]; + let mut cursor = Cursor::new(&mut buf[..]); + + write!( + cursor, + " + {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\n" + )?; + + let len = cursor.position() as usize; + // Direct syscall to avoid stdout buffering allocation + let written = unsafe { libc::write(libc::STDOUT_FILENO, buf.as_ptr().cast(), len) }; + if written < 0 { + return Err(io::Error::last_os_error().into()); + } + if written as usize != len { + return Err(io::Error::new(io::ErrorKind::WriteZero, "partial write to stdout").into()); + } + Ok(()) } diff --git a/src/release.rs b/src/release.rs index 6d1b20f..8d3232e 100644 --- a/src/release.rs +++ b/src/release.rs @@ -1,33 +1,69 @@ -use nix::sys::utsname::UtsName; -use std::{ - fs::File, - io::{self, BufRead, BufReader}, -}; +use std::{fmt::Write as _, io}; +use crate::{UtsName, syscall::read_file_fast}; + +#[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 { - let file = File::open("/etc/os-release")?; - let reader = BufReader::new(file); + // Fast byte-level scanning for PRETTY_NAME= + const PREFIX: &[u8] = b"PRETTY_NAME="; - 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()); - } + 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'"' + { + &value[1..value.len() - 1] + } else { + value + }; + + // Convert to String - should be valid UTF-8 + return Ok(String::from_utf8_lossy(trimmed).into_owned()); } - Ok("Unknown".to_string()) + + offset += line_end + 1; + } + + Ok("Unknown".to_owned()) } diff --git a/src/syscall.rs b/src/syscall.rs new file mode 100644 index 0000000..0c8634b --- /dev/null +++ b/src/syscall.rs @@ -0,0 +1,210 @@ +//! Incredibly fast syscall wrappers for using inline assembly. Serves the +//! purposes of completely bypassing Rust's standard library in favor of +//! handwritten Assembly. Is this a good idea? No. Is it fast? Yeah, but only +//! marginally. Either way it serves a purpose and I will NOT accept criticism. +//! What do you mean I wasted two whole hours to make the program only 100µs +//! faster? +//! +//! Supports `x86_64` and `aarch64` architectures. Riscv support will be +//! implemented when and ONLY WHEN I can be bothered to work on it. + +use std::io; + +/// Direct syscall to open a file +/// +/// # Returns +/// +/// File descriptor or -1 on error +/// +/// # Safety +/// +/// The caller must ensure: +/// +/// - `path` points to a valid null-terminated C string +/// - The pointer remains valid for the duration of the syscall +#[inline] +#[must_use] +pub unsafe fn sys_open(path: *const u8, flags: i32) -> i32 { + #[cfg(target_arch = "x86_64")] + unsafe { + let fd: i64; + std::arch::asm!( + "syscall", + in("rax") 2i64, // SYS_open + in("rdi") path, + in("rsi") flags, + in("rdx") 0i32, // mode (not used for reading) + lateout("rax") fd, + lateout("rcx") _, + lateout("r11") _, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + fd as i32 + } + } + #[cfg(target_arch = "aarch64")] + unsafe { + let fd: i64; + std::arch::asm!( + "svc #0", + in("x8") 56i64, // SYS_openat + in("x0") -100i32, // AT_FDCWD + in("x1") path, + in("x2") flags, + in("x3") 0i32, // mode + lateout("x0") fd, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + fd as i32 + } + } + #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))] + { + compile_error!("Unsupported architecture for inline assembly syscalls"); + } +} + +/// Direct syscall to read from a file descriptor +/// +/// # Returns n +/// +/// Number of bytes read or -1 on error +/// +/// # Safety +/// +/// The caller must ensure: +/// - `buf` points to a valid writable buffer of at least `count` bytes +/// - `fd` is a valid open file descriptor +#[inline] +pub unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize { + #[cfg(target_arch = "x86_64")] + unsafe { + let ret: i64; + std::arch::asm!( + "syscall", + in("rax") 0i64, // SYS_read + in("rdi") fd, + in("rsi") buf, + in("rdx") count, + lateout("rax") ret, + lateout("rcx") _, + lateout("r11") _, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + ret as isize + } + } + #[cfg(target_arch = "aarch64")] + unsafe { + let ret: i64; + std::arch::asm!( + "svc #0", + in("x8") 63i64, // SYS_read + in("x0") fd, + in("x1") buf, + in("x2") count, + lateout("x0") ret, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + ret as isize + } + } + #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))] + { + compile_error!("Unsupported architecture for inline assembly syscalls"); + } +} + +/// Direct syscall to close a file descriptor +/// +/// # Safety +/// +/// The caller must ensure `fd` is a valid open file descriptor +#[inline] +#[must_use] +pub unsafe fn sys_close(fd: i32) -> i32 { + #[cfg(target_arch = "x86_64")] + unsafe { + let ret: i64; + std::arch::asm!( + "syscall", + in("rax") 3i64, // SYS_close + in("rdi") fd, + lateout("rax") ret, + lateout("rcx") _, + lateout("r11") _, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + ret as i32 + } + } + #[cfg(target_arch = "aarch64")] + unsafe { + let ret: i64; + std::arch::asm!( + "svc #0", + in("x8") 57i64, // SYS_close + in("x0") fd, + lateout("x0") ret, + options(nostack) + ); + #[allow(clippy::cast_possible_truncation)] + { + ret as i32 + } + } + #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))] + { + compile_error!("Unsupported architecture for inline assembly syscalls"); + } +} + +/// Read entire file using direct syscalls. This avoids libc overhead and can be +/// significantly faster for small files. +/// +/// # Errors +/// +/// Returns an error if the file cannot be opened or read +#[inline] +pub fn read_file_fast(path: &str, buffer: &mut [u8]) -> io::Result { + const O_RDONLY: i32 = 0; + + // Use stack-allocated buffer for null-terminated path (max 256 bytes) + let path_bytes = path.as_bytes(); + if path_bytes.len() >= 256 { + return Err(io::Error::new(io::ErrorKind::InvalidInput, "Path too long")); + } + + let mut path_buf = [0u8; 256]; + path_buf[..path_bytes.len()].copy_from_slice(path_bytes); + // XXX: Already zero-terminated since array is initialized to zeros + + unsafe { + let fd = sys_open(path_buf.as_ptr(), O_RDONLY); + if fd < 0 { + return Err(io::Error::last_os_error()); + } + + let bytes_read = sys_read(fd, buffer.as_mut_ptr(), buffer.len()); + let _ = sys_close(fd); + + if bytes_read < 0 { + return Err(io::Error::last_os_error()); + } + + #[allow(clippy::cast_sign_loss)] + { + Ok(bytes_read as usize) + } + } +} diff --git a/src/system.rs b/src/system.rs index aed8752..ba8fe79 100644 --- a/src/system.rs +++ b/src/system.rs @@ -1,87 +1,184 @@ -use crate::colors::COLORS; -use nix::sys::{statvfs::statvfs, utsname::UtsName}; -use std::{ - env, - fs::File, - io::{self, Read}, -}; +use std::{ffi::CStr, fmt::Write as _, io, mem::MaybeUninit}; +use crate::{UtsName, colors::COLORS, syscall::read_file_fast}; + +#[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 = unsafe { + let ptr = libc::getenv(c"USER".as_ptr()); + if ptr.is_null() { + "unknown_user" + } else { + CStr::from_ptr(ptr).to_str().unwrap_or("unknown_user") + } + }; + 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() -} - -pub fn get_root_disk_usage() -> Result { - 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 = 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, - )) -} - -pub fn get_memory_usage() -> Result { - 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)?; - - 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)) + unsafe { + let ptr = libc::getenv(c"SHELL".as_ptr()); + if ptr.is_null() { + return "unknown_shell".into(); } - let (used_memory, total_memory) = parse_memory_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})", - cyan = COLORS.cyan, - reset = COLORS.reset, - )) + let bytes = CStr::from_ptr(ptr).to_bytes(); + let start = bytes.iter().rposition(|&b| b == b'/').map_or(0, |i| i + 1); + let name = std::str::from_utf8_unchecked(&bytes[start..]); + name.into() + } +} + +/// 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 { + let mut vfs = MaybeUninit::uninit(); + let path = b"/\0"; + + if unsafe { libc::statvfs(path.as_ptr().cast(), vfs.as_mut_ptr()) } != 0 { + return Err(io::Error::last_os_error()); + } + + let vfs = unsafe { vfs.assume_init() }; + let block_size = vfs.f_bsize; + let total_blocks = vfs.f_blocks; + let available_blocks = vfs.f_bavail; + + 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 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) +} + +/// Fast integer parsing without stdlib overhead +#[inline] +fn parse_u64_fast(s: &[u8]) -> u64 { + let mut result = 0u64; + for &byte in s { + if byte.is_ascii_digit() { + result = result * 10 + u64::from(byte - b'0'); + } else { + break; + } + } + 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 { + #[cfg_attr(feature = "hotpath", hotpath::measure)] + fn parse_memory_info() -> Result<(f64, f64), io::Error> { + let mut total_memory_kb = 0u64; + let mut available_memory_kb = 0u64; + let mut buffer = [0u8; 1024]; + + // Use fast syscall-based file reading + let bytes_read = read_file_fast("/proc/meminfo", &mut buffer)?; + let meminfo = &buffer[..bytes_read]; + + // Fast scanning for MemTotal and MemAvailable + let mut offset = 0; + let mut found_total = false; + let mut found_available = false; + + while offset < meminfo.len() && (!found_total || !found_available) { + let remaining = &meminfo[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(b"MemTotal:") { + // Skip "MemTotal:" and whitespace + let mut pos = 9; + while pos < line.len() && line[pos].is_ascii_whitespace() { + pos += 1; + } + total_memory_kb = parse_u64_fast(&line[pos..]); + found_total = true; + } else if line.starts_with(b"MemAvailable:") { + // Skip "MemAvailable:" and whitespace + let mut pos = 13; + while pos < line.len() && line[pos].is_ascii_whitespace() { + pos += 1; + } + available_memory_kb = parse_u64_fast(&line[pos..]); + found_available = true; + } + + offset += line_end + 1; + } + + #[allow(clippy::cast_precision_loss)] + let total_memory_gb = total_memory_kb as f64 / 1024.0 / 1024.0; + #[allow(clippy::cast_precision_loss)] + let available_memory_gb = available_memory_kb as f64 / 1024.0 / 1024.0; + let used_memory_gb = total_memory_gb - available_memory_gb; + + 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) } diff --git a/src/uptime.rs b/src/uptime.rs index 496052a..095af7d 100644 --- a/src/uptime.rs +++ b/src/uptime.rs @@ -1,40 +1,114 @@ use std::{io, mem::MaybeUninit}; -pub fn get_current() -> Result { - 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 } - }; +/// Faster integer to string conversion without the formatting overhead. +#[inline] +fn itoa(mut n: u64, buf: &mut [u8]) -> &str { + if n == 0 { + return "0"; + } - let days = uptime_seconds / 86400; - let hours = (uptime_seconds / 3600) % 24; - let minutes = (uptime_seconds / 60) % 60; + let mut i = buf.len(); + while n > 0 { + i -= 1; + buf[i] = b'0' + (n % 10) as u8; + n /= 10; + } - 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" }); - } - 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"); - } - - Ok(result) + unsafe { std::str::from_utf8_unchecked(&buf[i..]) } +} + +/// Direct `sysinfo` syscall using inline assembly +/// +/// # Safety +/// +/// This function uses inline assembly to make a direct syscall. +/// The caller must ensure the sysinfo pointer is valid. +#[inline] +unsafe fn sys_sysinfo(info: *mut libc::sysinfo) -> i64 { + #[cfg(target_arch = "x86_64")] + { + let ret: i64; + unsafe { + std::arch::asm!( + "syscall", + in("rax") 99_i64, // __NR_sysinfo + in("rdi") info, + out("rcx") _, + out("r11") _, + lateout("rax") ret, + options(nostack) + ); + } + ret + } + + #[cfg(target_arch = "aarch64")] + { + let ret: i64; + unsafe { + std::arch::asm!( + "svc #0", + in("x8") 179_i64, // __NR_sysinfo + in("x0") info, + lateout("x0") ret, + options(nostack) + ); + } + ret + } + + #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))] + { + unsafe { libc::sysinfo(info) as i64 } + } +} + +/// 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 { + let uptime_seconds = { + let mut info = MaybeUninit::uninit(); + if unsafe { sys_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 mut result = String::with_capacity(32); + let mut buf = [0u8; 20]; // Enough for u64::MAX + + if days > 0 { + result.push_str(itoa(days, &mut buf)); + result.push_str(if days == 1 { " day" } else { " days" }); + } + if hours > 0 { + if !result.is_empty() { + result.push_str(", "); + } + result.push_str(itoa(hours, &mut buf)); + result.push_str(if hours == 1 { " hour" } else { " hours" }); + } + if minutes > 0 { + if !result.is_empty() { + result.push_str(", "); + } + result.push_str(itoa(minutes, &mut buf)); + result.push_str(if minutes == 1 { " minute" } else { " minutes" }); + } + if result.is_empty() { + result.push_str("less than a minute"); + } + + Ok(result) }