build: update deps

this reduces the binary size from 22MB to 15MB
(via `nix build`, as reported by `eza`)

Cargo.toml

@@ -5,23 +5,14 @@ license = "AGPL-3.0-or-later"
 version = "0.1.0"
 edition = "2024"
 
-[features]
-default = [ "app" ]
-app = [ "dep:iced", "dep:smol" ]
-
 [dependencies]
-ron = "0.12.2"
+smol = "2.0.2"
 sysinfo = "0.39.6"
 
 [dependencies.iced]
 version = "0.14.0"
 features = [ "canvas", "smol" ]
-optional = true
 
-[dependencies.smol]
-version = "2.0.2"
-optional = true
-
-[dependencies.serde]
-version = "1.0.229"
-features = [ "derive" ]
+[profile.release]
+lto = true
+codegen-units = 1

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1785782307,
-        "narHash": "sha256-MPaRdVkf6zZP5fCPxYCi8Dr4pZzgmXzg8T9nVEbp3Mw=",
+        "lastModified": 1790899423,
+        "narHash": "sha256-THGtz65UGJU+sonZidRboyCMk+9DclpMF7pwL4uDV4M=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "2c71e194474d13de031d729b729c968ddbe3507f",
+        "rev": "47b6b27ed9a3a9181415e4367d0c30ab2a0e0250",
         "type": "github"
       },
       "original": {
@@ -35,18 +35,15 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1785747939,
-        "narHash": "sha256-D740uKsMbgsfK2oaDenJLLPIZfq7W0/g4KN/Fls8eKs=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "104240a772428cc2e20d8fd86c9ddbb886bbaff2",
-        "type": "github"
+        "lastModified": 1791260994,
+        "narHash": "sha256-MFBjw66d4h06MvpW6lIl7RwarLteD0sk859CncGwb1Q=",
+        "rev": "151fa4e8ddfdd8dd25d945ad94ed54a13de9f6e4",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1086391.151fa4e8ddfd/nixexprs.tar.zst?lastModified=1791260994&rev=151fa4e8ddfdd8dd25d945ad94ed54a13de9f6e4"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst"
       }
     },
     "root": {

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    nixpkgs.url = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst";
 
     crane.url = "github:ipetkov/crane";
 
@@ -58,6 +58,7 @@
             desktopItem = pkgs.makeDesktopItem {
               inherit name;
               desktopName = name;
+              icon = name;
               exec = name;
             };
           in
@@ -88,13 +89,6 @@
       {
         packages.default = crate;
 
-        packages."${name}-server-only" = craneLib.buildPackage {
-          name = "${name}-server-only";
-          src = ./.;
-          doCheck = false;
-          cargoExtraArgs = "--locked --no-default-features";
-        };
-
         checks = {
           crate-clippy = craneLib.cargoClippy (
             commonArgs

src/app/graph.rs

@@ -6,42 +6,18 @@ use crate::app;
 
 const CYAN: Color = Color::from_rgb8(0, 255, 255);
 
+#[derive(Default)]
 pub struct Graph {
-    timeline: VecDeque<f32>,
-
-    pub show_borders: bool,
     pub cache: canvas::Cache,
-}
-impl Default for Graph {
-    fn default() -> Self {
-        Self {
-            show_borders: true,
-
-            timeline: Default::default(),
-            cache: Default::default(),
-        }
-    }
+    timeline: VecDeque<f32>,
 }
 
 impl Graph {
-    pub fn new(value: f32) -> Self {
-        Self {
-            timeline: {
-                let mut vec = VecDeque::new();
-                vec.push_front(value);
-                vec
-            },
-            ..Default::default()
-        }
-    }
-
     pub fn update(&mut self, value: f32) {
         self.timeline.push_back(value);
-        if self.timeline.len() > 500 {
+        if self.timeline.len() > 1000 {
             self.timeline.pop_front();
         }
-
-        self.cache.clear();
     }
 }
 
@@ -56,19 +32,11 @@ impl canvas::Program<app::Message, Theme, Renderer> for Graph {
         _cursor: mouse::Cursor,
     ) -> Vec<canvas::Geometry<Renderer>> {
         let geometry = self.cache.draw(renderer, bounds.size(), |frame| {
-            if self.show_borders {
-                frame.stroke_rectangle(
-                    Point::new(0., 0.),
-                    bounds.size(),
-                    canvas::Stroke::default().with_color(Color::from_rgb8(255, 0, 0)),
-                );
-            }
             frame.stroke(
                 &canvas::Path::new(|builder| {
                     for (index, value) in self.timeline.iter().enumerate() {
                         let x = index as f32 / self.timeline.len() as f32 * bounds.width;
-                        let y = (bounds.height - value / 100. * bounds.height)
-                            .clamp(1., bounds.height - 1.);
+                        let y = bounds.height - value / 100. * bounds.height;
                         builder.line_to(Point::new(x, y))
                     }
                 }),

src/app/info_stream.rs

@@ -1,64 +0,0 @@
-use std::env;
-
-use iced::{
-    Task,
-    futures::{self, SinkExt},
-    stream,
-};
-use ron::de;
-use smol::{Timer, unblock};
-
-use crate::{
-    app,
-    sysinfo_snapshot::{self, SysinfoSnapshot},
-};
-
-pub fn create() -> Task<app::Message> {
-    if env::args()
-        .nth(1)
-        .is_some_and(|command| command == "client")
-    {
-        Task::run(
-            stream::channel(
-                1,
-                async |mut sender: futures::channel::mpsc::Sender<SysinfoSnapshot>| {
-                    let mut buf = String::new();
-                    loop {
-                        buf = unblock(move || {
-                            std::io::stdin().read_line(&mut buf).unwrap();
-                            buf
-                        })
-                        .await;
-
-                        match de::from_str(&buf) {
-                            Ok(info) => sender.send(info).await.unwrap(),
-                            Err(e) => eprintln!("{e}"),
-                        }
-                        buf.clear();
-                    }
-                },
-            ),
-            app::Message::Info,
-        )
-    } else {
-        Task::run(
-            stream::channel(
-                1,
-                async |mut sender: futures::channel::mpsc::Sender<SysinfoSnapshot>| {
-                    let mut sys = sysinfo::System::new();
-                    let refreshes = sysinfo_snapshot::refreshes();
-
-                    sys.refresh_specifics(refreshes);
-                    Timer::after(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL).await;
-
-                    loop {
-                        sys.refresh_specifics(refreshes);
-                        sender.send(SysinfoSnapshot::from(&sys)).await.unwrap();
-                        Timer::after(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL).await;
-                    }
-                },
-            ),
-            app::Message::Info,
-        )
-    }
-}

src/app/mod.rs

@@ -1,198 +1,66 @@
-use std::time::Duration;
-
 use iced::{
-    Color, Error, Event, Length, Renderer, Subscription, Task, Theme, application, event,
-    keyboard::{self, Key},
-    theme, widget,
+    Color, Element, Length, Renderer, Task, Theme, application, futures::SinkExt, stream, theme,
+    widget,
 };
+use smol::Timer;
 
-use crate::{
-    app::{graph::Graph, utils::maybe_widget},
-    sysinfo_snapshot::{ProcessSnapshot, SysinfoSnapshot},
-    utils::Toggle,
-};
+use crate::app::graph::Graph;
 
 mod graph;
-mod info_stream;
-mod utils;
-
-type Element<'a> = iced::Element<'a, Message, Theme, Renderer>;
 
 enum Message {
-    ToggleMain,
-    ToggleCpu,
-    ToggleMemory,
-    ToggleProcesses,
-
-    Info(SysinfoSnapshot),
+    Cpu(f32),
 }
 
-#[derive(Default)]
 struct State {
-    uptime: Duration,
-
-    is_main_section_shown: bool,
-    total_cpu_graph: Graph,
-
-    is_cpu_section_shown: bool,
-    cpu_graphs: Vec<Graph>,
-
-    is_memory_section_shown: bool,
-    memory_graph: Graph,
-    swap_graph: Graph,
-
-    is_processes_section_shown: bool,
-    processes: Vec<ProcessSnapshot>,
+    cpu_graph: Graph,
 }
 
 impl State {
     fn new() -> (Self, Task<Message>) {
-        let mut state = Self {
-            is_main_section_shown: true,
-            ..Default::default()
-        };
-        state.total_cpu_graph.show_borders = false;
+        (
+            Self {
+                cpu_graph: Default::default(),
+            },
+            Task::run(
+                stream::channel(1, async |mut sender| {
+                    let mut sys = sysinfo::System::new();
+                    let refreshes = sysinfo::RefreshKind::nothing()
+                        .with_cpu(sysinfo::CpuRefreshKind::nothing().with_cpu_usage());
 
-        (state, info_stream::create())
+                    sys.refresh_specifics(refreshes);
+                    Timer::after(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL).await;
+
+                    loop {
+                        sys.refresh_specifics(refreshes);
+                        Timer::after(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL).await;
+                        sender.send(sys.global_cpu_usage()).await.unwrap();
+                    }
+                }),
+                Message::Cpu,
+            ),
+        )
     }
     fn update(&mut self, message: Message) -> Task<Message> {
         match message {
-            Message::ToggleMain => {
-                self.is_main_section_shown.toggle();
-                self.check_borders();
-            }
-            Message::ToggleCpu => {
-                self.is_cpu_section_shown.toggle();
-                self.check_borders();
-            }
-            Message::ToggleMemory => {
-                self.is_memory_section_shown.toggle();
-                self.check_borders();
-            }
-            Message::ToggleProcesses => {
-                self.is_processes_section_shown.toggle();
-                self.check_borders();
-            }
-
-            Message::Info(snapshot) => {
-                self.uptime = snapshot.uptime();
-
-                self.total_cpu_graph.update(snapshot.cpu_total);
-
-                self.memory_graph
-                    .update(snapshot.memory as f32 / snapshot.memory_total as f32 * 100.);
-
-                self.swap_graph
-                    .update(snapshot.swap as f32 / snapshot.swap_total as f32 * 100.);
-
-                if self.cpu_graphs.len() != snapshot.cpus.len() {
-                    self.cpu_graphs = snapshot
-                        .cpus
-                        .into_iter()
-                        .map(|value| Graph::new(value))
-                        .collect();
-                } else {
-                    self.cpu_graphs
-                        .iter_mut()
-                        .zip(snapshot.cpus.into_iter())
-                        .for_each(|(graph, value)| graph.update(value));
-                }
-
-                self.processes = snapshot.processes;
-                self.processes
-                    .sort_by(|a, b| b.cpu_usage.total_cmp(&a.cpu_usage));
+            Message::Cpu(value) => {
+                self.cpu_graph.update(value);
+                self.cpu_graph.cache.clear();
             }
         }
 
         Task::none()
     }
-    fn view(&self) -> Element<'_> {
-        widget::column([
-            widget::row([
-                maybe_widget(self.is_main_section_shown, || {
-                    widget::canvas(&self.total_cpu_graph)
-                        .width(Length::Fill)
-                        .height(Length::Fill)
-                        .into()
-                }),
-                maybe_widget(self.is_cpu_section_shown, || {
-                    widget::grid(
-                        self.cpu_graphs
-                            .iter()
-                            .map(|graph| widget::Canvas::new(graph).into()),
-                    )
-                    .columns(2)
-                    .height(Length::Fill)
-                    .into()
-                }),
-            ])
-            .into(),
-            widget::row([
-                maybe_widget(self.is_memory_section_shown, || {
-                    widget::row([
-                        widget::canvas(&self.memory_graph)
-                            .width(Length::Fill)
-                            .height(Length::Fill)
-                            .into(),
-                        widget::canvas(&self.swap_graph)
-                            .width(Length::Fill)
-                            .height(Length::Fill)
-                            .into(),
-                    ])
-                    .into()
-                }),
-                maybe_widget(self.is_processes_section_shown, || {
-                    widget::scrollable(
-                        widget::grid(self.processes.iter().flat_map(|process| {
-                            [
-                                widget::text(&process.name).into(),
-                                widget::text(process.cpu_usage).into(),
-                                widget::text(format!("{:?}", process.cpu_time())).into(),
-                                widget::text(process.pid).into(),
-                            ]
-                        }))
-                        .height(Length::Shrink)
-                        .columns(4),
-                    )
-                    .width(Length::Fill)
-                    .height(Length::Fill)
-                    .into()
-                }),
-            ])
-            .into(),
-        ])
-        .into()
-    }
-
-    fn subscription(&self) -> Subscription<Message> {
-        event::listen().filter_map(|event| match event {
-            Event::Keyboard(keyboard::Event::KeyPressed { modified_key, .. }) => {
-                match modified_key.as_ref() {
-                    Key::Character("M" | "1") => Some(Message::ToggleMain),
-                    Key::Character("c" | "2") => Some(Message::ToggleCpu),
-                    Key::Character("m" | "3") => Some(Message::ToggleMemory),
-                    Key::Character("p" | "4") => Some(Message::ToggleProcesses),
-                    _ => None,
-                }
-            }
-            _ => None,
-        })
-    }
-
-    fn title(&self) -> String {
-        format!("itop {:?}", self.uptime)
-    }
-
-    fn check_borders(&mut self) {
-        self.total_cpu_graph.show_borders =
-            self.is_cpu_section_shown || self.is_memory_section_shown;
+    fn view(&self) -> Element<'_, Message, Theme, Renderer> {
+        widget::Canvas::new(&self.cpu_graph)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .into()
     }
 }
 
-pub fn run() -> Result<(), Error> {
+pub fn run() -> Result<(), impl std::error::Error> {
     application(State::new, State::update, State::view)
-        .subscription(State::subscription)
-        .title(State::title)
         .theme(theme::Theme::custom(
             "high-contrast-dark",
             theme::Palette {

src/app/utils.rs

@@ -1,14 +0,0 @@
-use iced::widget;
-
-use crate::app;
-
-pub fn maybe_widget<'a>(
-    condition: bool,
-    widget: impl FnOnce() -> app::Element<'a>,
-) -> app::Element<'a> {
-    if condition {
-        widget()
-    } else {
-        widget::space().into()
-    }
-}

src/main.rs

@@ -1,19 +1,5 @@
-use std::env;
-
-#[cfg(feature = "app")]
 mod app;
-mod server;
-mod sysinfo_snapshot;
-mod utils;
 
-fn main() {
-    match env::args().nth(1).as_deref() {
-        #[cfg(feature = "app")]
-        None | Some("client") => app::run().unwrap(),
-
-        #[cfg_attr(feature = "app", allow(unreachable_patterns))]
-        None | Some("server") => server::run().unwrap(),
-
-        Some(s) => panic!("invalid argument: {s}"),
-    }
+fn main() -> Result<(), impl std::error::Error> {
+    app::run()
 }

src/server/mod.rs

@@ -1,21 +0,0 @@
-use std::{io::Write, thread};
-
-use ron::{Error, ser};
-
-use crate::sysinfo_snapshot::{self, SysinfoSnapshot};
-
-pub fn run() -> Result<(), Error> {
-    let mut sys = sysinfo::System::new();
-    let refreshes = sysinfo_snapshot::refreshes();
-
-    sys.refresh_specifics(refreshes);
-    thread::sleep(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL);
-
-    let mut stdout = std::io::stdout();
-
-    loop {
-        sys.refresh_specifics(refreshes);
-        stdout.write_all((ser::to_string(&SysinfoSnapshot::from(&sys))? + "\n").as_bytes())?;
-        thread::sleep(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL);
-    }
-}

src/sysinfo_snapshot.rs

@@ -1,87 +0,0 @@
-use std::time::Duration;
-
-pub fn refreshes() -> sysinfo::RefreshKind {
-    sysinfo::RefreshKind::nothing()
-        .with_memory(sysinfo::MemoryRefreshKind::everything())
-        .with_cpu(sysinfo::CpuRefreshKind::nothing().with_cpu_usage())
-        .with_processes(
-            sysinfo::ProcessRefreshKind::nothing()
-                .with_cpu()
-                .with_cmd(sysinfo::UpdateKind::OnlyIfNotSet)
-                .with_exe(sysinfo::UpdateKind::OnlyIfNotSet),
-        )
-}
-
-#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
-pub struct SysinfoSnapshot {
-    /// in seconds
-    uptime: u64,
-
-    pub cpu_total: f32,
-    pub cpus: Vec<f32>,
-
-    pub memory: u64,
-    pub memory_total: u64,
-    pub swap: u64,
-    pub swap_total: u64,
-
-    pub processes: Vec<ProcessSnapshot>,
-}
-impl SysinfoSnapshot {
-    #[cfg_attr(not(feature = "app"), allow(dead_code))]
-    pub fn uptime(&self) -> Duration {
-        Duration::from_secs(self.uptime)
-    }
-}
-
-impl From<&sysinfo::System> for SysinfoSnapshot {
-    fn from(value: &sysinfo::System) -> Self {
-        Self {
-            uptime: sysinfo::System::uptime(),
-
-            cpu_total: value.global_cpu_usage(),
-            cpus: value.cpus().iter().map(|cpu| cpu.cpu_usage()).collect(),
-
-            memory: value.used_memory(),
-            memory_total: value.total_memory(),
-            swap: value.used_swap(),
-            swap_total: value.total_swap(),
-
-            processes: value
-                .processes()
-                .iter()
-                .map(|(_pid, process)| ProcessSnapshot::from(process))
-                .collect(),
-        }
-    }
-}
-
-#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
-pub struct ProcessSnapshot {
-    pub pid: usize,
-
-    /// in CPU-milliseconds
-    accumulated_cpu_time: u64,
-
-    /// note: it's by core, and can be up to eg 1600 on a 16-core device
-    pub cpu_usage: f32,
-
-    pub name: String,
-}
-impl ProcessSnapshot {
-    pub fn cpu_time(&self) -> Duration {
-        Duration::from_millis(self.accumulated_cpu_time)
-    }
-}
-
-impl From<&sysinfo::Process> for ProcessSnapshot {
-    fn from(value: &sysinfo::Process) -> Self {
-        Self {
-            pid: value.pid().into(),
-            accumulated_cpu_time: value.accumulated_cpu_time(),
-            cpu_usage: value.cpu_usage(),
-
-            name: value.name().to_string_lossy().into_owned(),
-        }
-    }
-}

src/utils.rs

@@ -1,10 +0,0 @@
-#[cfg_attr(not(feature = "app"), allow(dead_code))]
-pub trait Toggle {
-    fn toggle(&mut self);
-}
-
-impl Toggle for bool {
-    fn toggle(&mut self) {
-        *self = !*self
-    }
-}