watt: turn into a library

.rustfmt.toml

@@ -1,6 +1,3 @@
-# Taken from https://github.com/cull-os/carcass.
-# Modified to have 2 space indents and 80 line width.
-
 # float_literal_trailing_zero  = "Always" # TODO: Warning for some reason?
 condense_wildcard_suffixes   = true
 doc_comment_code_block_width = 80

.taplo.toml

@@ -1,5 +1,3 @@
-# Taken from https://github.com/cull-os/carcass.
-
 [formatting]
 align_entries         = true
 column_width          = 100

Cargo.toml

@@ -1,12 +1,17 @@
-[package]
-name         = "watt"
-description  = "Modern CPU frequency and power management utility for Linux"
-version      = "0.4.0"
-edition      = "2024"
-authors      = [ "NotAShelf <raf@notashelf.dev>", "RGBCube <git@rgbcu.be>" ]
-rust-version = "1.85"
+[workspace]
+members  = [ "watt" ]
+resolver = "3"
 
-[dependencies]
+[workspace.package]
+authors      = [ "NotAShelf <raf@notashelf.dev>", "RGBCube <git@rgbcu.be>" ]
+description  = "Modern CPU frequency and power management utility for Linux"
+edition      = "2024"                                                        # Keep in sync with .rustfmt.toml.
+license      = "MPL-2.0"
+repository   = "https://github.com/notashelf/watt"
+rust-version = "1.85"
+version      = "0.4.0"
+
+[workspace.dependencies]
 anyhow              = "1.0"
 clap                = { version = "4.0", features = [ "derive", "env" ] }
 clap-verbosity-flag = "3.0.2"

build.rs

@@ -1,57 +0,0 @@
-use std::{
-  env,
-  fs,
-  path::PathBuf,
-};
-
-const MULTICALL_NAMES: &[&str] = &["cpu", "power"];
-
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-  println!("cargo:rerun-if-changed=build.rs");
-  println!("cargo:rerun-if-changed=target");
-
-  let out_dir = PathBuf::from(env::var("OUT_DIR")?);
-  let target = out_dir
-        .parent() // target/debug/build/<pkg>-<hash>/out
-        .and_then(|p| p.parent()) // target/debug/build/<pkg>-<hash>
-        .and_then(|p| p.parent()) // target/debug/
-        .ok_or("failed to find target directory")?;
-
-  let main_binary_name = env::var("CARGO_PKG_NAME")?;
-
-  let main_binary_path = target.join(&main_binary_name);
-
-  let mut errored = false;
-
-  for name in MULTICALL_NAMES {
-    let hardlink_path = target.join(name);
-
-    if hardlink_path.exists() {
-      if hardlink_path.is_dir() {
-        fs::remove_dir_all(&hardlink_path)?;
-      } else {
-        fs::remove_file(&hardlink_path)?;
-      }
-    }
-
-    if let Err(error) = fs::hard_link(&main_binary_path, &hardlink_path) {
-      println!(
-        "cargo:warning=failed to create hard link '{path}': {error}",
-        path = hardlink_path.display(),
-      );
-      errored = true;
-    }
-  }
-
-  if errored {
-    println!(
-      "cargo:warning=this often happens because the target binary isn't built \
-       yet, try running `cargo build` again"
-    );
-    println!(
-      "cargo:warning=keep in mind that this is for development purposes only"
-    );
-  }
-
-  Ok(())
-}

watt/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name                   = "watt"
+description.workspace  = true
+version.workspace      = true
+edition.workspace      = true
+authors.workspace      = true
+rust-version.workspace = true
+
+[lib]
+path = "lib.rs"
+
+[[bin]]
+name = "watt"
+path = "main.rs"
+
+[dependencies]
+anyhow.workspace              = true
+clap.workspace                = true
+clap-verbosity-flag.workspace = true
+ctrlc.workspace               = true
+derive_more.workspace         = true
+env_logger.workspace          = true
+log.workspace                 = true
+num_cpus.workspace            = true
+serde.workspace               = true
+thiserror.workspace           = true
+toml.workspace                = true
+yansi.workspace               = true

watt/config.rs

@@ -523,7 +523,7 @@ pub struct DaemonConfig {
 }
 
 impl DaemonConfig {
-  const DEFAULT: &str = include_str!("../config.toml");
+  const DEFAULT: &str = include_str!("config.toml");
 
   pub fn load_from(path: Option<&Path>) -> anyhow::Result<Self> {
     let contents = if let Some(path) = path {

watt/config.toml

@@ -5,28 +5,27 @@
 
 # Emergency thermal protection (highest priority).
 [[rule]]
+if       = { value = "$cpu-temperature", is-more-than = 85.0 }
+priority = 100
+
 cpu.energy-performance-preference = "power"
 cpu.frequency-mhz-maximum         = 2000
 cpu.governor                      = "powersave"
 cpu.turbo                         = false
-if                                = { value = "$cpu-temperature", is-more-than = 85.0 }
-priority                          = 100
 
 # Critical battery preservation.
 [[rule]]
+if.all   = [ "?discharging", { value = "%power-supply-charge", is-less-than = 0.3 } ]
+priority = 90
+
 cpu.energy-performance-preference = "power"
-cpu.frequency-mhz-maximum         = 800                                                                        # More aggressive below critical threshold.
+cpu.frequency-mhz-maximum         = 800         # More aggressive below critical threshold.
 cpu.governor                      = "powersave"
 cpu.turbo                         = false
-if.all                            = [ "?discharging", { value = "%power-supply-charge", is-less-than = 0.3 } ]
 power.platform-profile            = "low-power"
-priority                          = 90
 
 # High performance mode for sustained high load.
 [[rule]]
-cpu.energy-performance-preference = "performance"
-cpu.governor = "performance"
-cpu.turbo = true
 if.all = [
   { value = "%cpu-usage", is-more-than = 0.8 },
   { value = "$cpu-idle-seconds", is-less-than = 30.0 },
@@ -34,12 +33,12 @@ if.all = [
 ]
 priority = 80
 
+cpu.energy-performance-preference = "performance"
+cpu.governor                      = "performance"
+cpu.turbo                         = true
+
 # Performance mode when not discharging.
 [[rule]]
-cpu.energy-performance-bias = "balance_performance"
-cpu.energy-performance-preference = "performance"
-cpu.governor = "performance"
-cpu.turbo = true
 if.all = [
   { not = "?discharging" },
   { value = "%cpu-usage", is-more-than = 0.1 },
@@ -47,56 +46,66 @@ if.all = [
 ]
 priority = 70
 
+cpu.energy-performance-bias       = "balance_performance"
+cpu.energy-performance-preference = "performance"
+cpu.governor                      = "performance"
+cpu.turbo                         = true
+
 # Moderate performance for medium load.
 [[rule]]
-cpu.energy-performance-preference = "balance_performance"
-cpu.governor = "schedutil"
 if.all = [
   { value = "%cpu-usage", is-more-than = 0.4 },
   { value = "%cpu-usage", is-less-than = 0.8 },
 ]
 priority = 60
 
+cpu.energy-performance-preference = "balance_performance"
+cpu.governor                      = "schedutil"
+
 # Power saving during low activity.
 [[rule]]
-cpu.energy-performance-preference = "power"
-cpu.governor = "powersave"
-cpu.turbo = false
 if.all = [
   { value = "%cpu-usage", is-less-than = 0.2 },
   { value = "$cpu-idle-seconds", is-more-than = 60.0 },
 ]
 priority = 50
 
+cpu.energy-performance-preference = "power"
+cpu.governor                      = "powersave"
+cpu.turbo                         = false
+
 # Extended idle power optimization.
 [[rule]]
+if       = { value = "$cpu-idle-seconds", is-more-than = 300.0 }
+priority = 40
+
 cpu.energy-performance-preference = "power"
 cpu.frequency-mhz-maximum         = 1600
 cpu.governor                      = "powersave"
 cpu.turbo                         = false
-if                                = { value = "$cpu-idle-seconds", is-more-than = 300.0 }
-priority                          = 40
 
 # Battery conservation when discharging.
 [[rule]]
+if.all   = [ "?discharging", { value = "%power-supply-charge", is-less-than = 0.5 } ]
+priority = 30
+
 cpu.energy-performance-preference = "power"
 cpu.frequency-mhz-maximum         = 2000
 cpu.governor                      = "powersave"
 cpu.turbo                         = false
-if.all                            = [ "?discharging", { value = "%power-supply-charge", is-less-than = 0.5 } ]
 power.platform-profile            = "low-power"
-priority                          = 30
 
 # General battery mode.
 [[rule]]
+if       = "?discharging"
+priority = 20
+
 cpu.energy-performance-bias       = "balance_power"
 cpu.energy-performance-preference = "power"
 cpu.frequency-mhz-maximum         = 1800
 cpu.frequency-mhz-minimum         = 200
 cpu.governor                      = "powersave"
 cpu.turbo                         = false
-if                                = "?discharging"
-priority                          = 20
 
 # Balanced performance for general use. Default fallback rule.
 [[rule]]

watt/lib.rs

@@ -1,37 +1,27 @@
-mod cpu;
-mod power_supply;
-mod system;
+use std::path::PathBuf;
 
-mod fs;
-
-mod config;
-// mod core;
-mod daemon;
-// mod engine;
-// mod monitor;
-
-use std::{
-  fmt::Write as _,
-  io,
-  io::Write as _,
-  path::PathBuf,
-  process,
-};
-
-use anyhow::Context;
+use anyhow::Context as _;
 use clap::Parser as _;
-use yansi::Paint as _;
+
+pub mod cpu;
+pub mod power_supply;
+pub mod system;
+
+pub mod fs;
+
+pub mod config;
+pub mod daemon;
 
 #[derive(clap::Parser, Debug)]
 #[clap(author, version, about)]
-struct Cli {
+pub struct Cli {
   #[clap(subcommand)]
   command: Command,
 }
 
 #[derive(clap::Parser, Debug)]
 #[clap(multicall = true)]
-enum Command {
+pub enum Command {
   /// Watt daemon.
   Watt {
     #[command(flatten)]
@@ -62,18 +52,18 @@ enum Command {
 }
 
 #[derive(clap::Parser, Debug)]
-enum CpuCommand {
+pub enum CpuCommand {
   /// Modify CPU attributes.
   Set(config::CpuDelta),
 }
 
 #[derive(clap::Parser, Debug)]
-enum PowerCommand {
+pub enum PowerCommand {
   /// Modify power supply attributes.
   Set(config::PowerDelta),
 }
 
-fn real_main() -> anyhow::Result<()> {
+pub fn main() -> anyhow::Result<()> {
   let cli = Cli::parse();
 
   yansi::whenever(yansi::Condition::TTY_AND_COLOR);
@@ -107,52 +97,3 @@ fn real_main() -> anyhow::Result<()> {
     } => delta.apply(),
   }
 }
-
-fn main() {
-  let Err(error) = real_main() else {
-    return;
-  };
-
-  let mut err = io::stderr();
-
-  let mut message = String::new();
-  let mut chain = error.chain().rev().peekable();
-
-  while let Some(error) = chain.next() {
-    let _ = write!(
-      err,
-      "{header} ",
-      header = if chain.peek().is_none() {
-        "error:"
-      } else {
-        "cause:"
-      }
-      .red()
-      .bold(),
-    );
-
-    String::clear(&mut message);
-    let _ = write!(message, "{error}");
-
-    let mut chars = message.char_indices();
-
-    let _ = match (chars.next(), chars.next()) {
-      (Some((_, first)), Some((second_start, second)))
-        if second.is_lowercase() =>
-      {
-        writeln!(
-          err,
-          "{first_lowercase}{rest}",
-          first_lowercase = first.to_lowercase(),
-          rest = &message[second_start..],
-        )
-      },
-
-      _ => {
-        writeln!(err, "{message}")
-      },
-    };
-  }
-
-  process::exit(1);
-}

watt/main.rs

@@ -0,0 +1,57 @@
+use std::{
+  fmt::Write as _,
+  io,
+  io::Write as _,
+  process,
+};
+
+use yansi::Paint as _;
+
+fn main() {
+  let Err(error) = watt::main() else {
+    return;
+  };
+
+  let mut err = io::stderr();
+
+  let mut message = String::new();
+  let mut chain = error.chain().rev().peekable();
+
+  while let Some(error) = chain.next() {
+    let _ = write!(
+      err,
+      "{header} ",
+      header = if chain.peek().is_none() {
+        "error:"
+      } else {
+        "cause:"
+      }
+      .red()
+      .bold(),
+    );
+
+    String::clear(&mut message);
+    let _ = write!(message, "{error}");
+
+    let mut chars = message.char_indices();
+
+    let _ = match (chars.next(), chars.next()) {
+      (Some((_, first)), Some((second_start, second)))
+        if second.is_lowercase() =>
+      {
+        writeln!(
+          err,
+          "{first_lowercase}{rest}",
+          first_lowercase = first.to_lowercase(),
+          rest = &message[second_start..],
+        )
+      },
+
+      _ => {
+        writeln!(err, "{message}")
+      },
+    };
+  }
+
+  process::exit(1);
+}

watt/power_supply.rs

@@ -227,10 +227,13 @@ impl PowerSupply {
         }
       }
       // Check for model name that indicates a peripheral
-      if let Some(model) = fs::read(self.path.join("model_name"))
+      if let Some(model_name) = fs::read(self.path.join("model_name"))
         .with_context(|| format!("failed to read the model name of {self}"))?
       {
-        if model.contains("bluetooth") || model.contains("wireless") {
+        let model_name_lower = model_name.to_lowercase();
+        if model_name_lower.contains("bluetooth")
+          || model_name_lower.contains("wireless")
+        {
           break 'is_from_peripheral true;
         }
       }

watt/system.rs

@@ -295,8 +295,8 @@ impl System {
         "stripped content is a valid number, taking it as the core number"
       );
       log::debug!(
-                "it is fine if this number doesn't seem accurate due to CPU binning, see a more detailed explanation at: https://rgbcu.be/blog/why-cores"
-            );
+        "it is fine if this number doesn't seem accurate due to CPU binning, see a more detailed explanation at: https://rgbcu.be/blog/why-cores"
+      );
 
       let Some(temperature_mc) =
         fs::read_n::<i64>(&input_path).with_context(|| {