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--git a/Cargo.toml b/Cargo.toml index 01a2385..7d54b7a 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -2,11 +2,13 @@ name = "volume_indicator" version = "0.1.0" authors = ["Joakim Hulthe "] -edition = "2018" - -# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html +edition = "2021" [dependencies] colored = "2.0.0" terminal_size = "0.1.13" structopt = "0.3.20" +hotwatch = "0.5.0" +color-eyre = "0.6.2" +eyre = "0.6.8" +tokio = { version = "1.33.0", features = ["macros", "rt", "sync", "time", "io-std", "io-util", "fs"] } diff --git a/src/main.rs b/src/main.rs index a135e2b..efb1804 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,10 +1,17 @@ -use std::process::Command; -use terminal_size::{Width, Height, terminal_size}; use colored::{Color, Colorize}; -use std::io::{self, Write, stdout}; -use std::thread::sleep; +use hotwatch::Hotwatch; +use std::fs::remove_file; +use std::future::pending; +use std::io::{stdout, BufWriter, Write}; +use std::path::PathBuf; +use std::process::{self, Command}; +use std::sync::Arc; use std::time::Duration; use structopt::StructOpt; +use terminal_size::{terminal_size, Height, Width}; +use tokio::sync::Notify; +use tokio::time::sleep; +use tokio::{fs::File, select, spawn}; #[derive(Debug, StructOpt)] #[structopt()] @@ -20,52 +27,43 @@ struct Opt { /// Set number of rows in column #[structopt(short, long)] timeout: Option, + + /// Watch for changes on a file. If the file changes, restart the timeout. + #[structopt(short, long)] + watch: Option, } -const COLORS: &[Color] = &[ - Color::Green, - Color::Blue, - Color::Yellow, - Color::Red, -]; +type Rendered = Vec>; -const BLOCK_CHARS: &[char] = &[ - ' ', - '▁', - '▂', - '▃', - '▄', - '▅', - '▆', - '▇', - '█', -]; +const COLORS: &[Color] = &[Color::Green, Color::Blue, Color::Yellow, Color::Red]; -fn main() -> io::Result<()> { - let opt = Opt::from_args(); +const BLOCK_CHARS: &[char] = &[' ', '▁', '▂', '▃', '▄', '▅', '▆', '▇', '█']; +fn get_volume() -> eyre::Result { + let output = Command::new("pamixer").args(["--get-volume"]).output()?; + + let out = + std::str::from_utf8(&output.stdout).expect("failed to parse paxmixer output as utf-8"); + + let volume: u16 = out + .trim() + .parse() + .expect("failed to parse pamixer output as u16"); + let percentage = volume as f64 / 100.0; + Ok(percentage) +} + +fn render_bars(opt: &Opt, volume: f64) -> eyre::Result { let (Width(calc_max_cols), Height(calc_max_rows)) = terminal_size().unwrap(); let calc_max_rows = calc_max_rows.min(4); let max_cols = opt.cols.unwrap_or(calc_max_cols); let max_rows = opt.rows.unwrap_or(calc_max_rows); - - let output = Command::new("pamixer") - .args(&["--get-volume"]) - .output()?; - - let out = std::str::from_utf8(&output.stdout) - .expect("failed to parse paxmixer output as utf-8"); - - let volume: u16 = out.trim().parse().expect("failed to parse pamixer output as u16"); - let percentage = volume as f64 / 100.0; - - let num_cols = ((max_cols as f64 * percentage) as u16).min(max_cols); + let num_cols = ((max_cols as f64 * volume) as u16).min(max_cols); let max_chars = max_cols / 2; let num_chars = num_cols / 2; - let mut lines = vec![vec![]; max_rows as usize]; for i in 0..num_chars { @@ -83,22 +81,98 @@ fn main() -> io::Result<()> { } lines.reverse(); + Ok(lines) +} + +fn draw_bars(lines: &Rendered) -> eyre::Result<()> { let stdout = stdout(); - let mut handle = stdout.lock(); + let mut stdout = BufWriter::new(stdout.lock()); + + // clear console and more cursor to 0,0 + write!(&mut stdout, "{esc}[2J{esc}[1;1H", esc = 27 as char)?; let mut char_buf = [0u8; 4]; - for line in &lines { - writeln!(&mut handle)?; + for line in lines { + writeln!(&mut stdout)?; for &(bc, color) in line { - let bc = bc.encode_utf8(&mut char_buf); - write!(&mut handle, " {}", bc.color(color))?; + let bc = bc.encode_utf8(&mut char_buf); + write!(&mut stdout, " {}", bc.color(color))?; } } - handle.flush()?; + stdout.flush()?; + Ok(()) +} + +#[tokio::main(flavor = "current_thread")] +async fn main() -> eyre::Result<()> { + let opt = Opt::from_args(); + color_eyre::install()?; + + if let Some(path) = &opt.watch { + let _file = File::options() + .create_new(true) + .write(true) + .open(path) + .await?; + } + + let mut volume = get_volume()?; + + { + let rendered = render_bars(&opt, volume)?; + draw_bars(&rendered)?; + } + + let extend_timeout = Arc::new(Notify::new()); if let Some(millis) = opt.timeout { - sleep(Duration::from_millis(millis)); + let duration = Duration::from_millis(millis); + let extend_timeout = Arc::clone(&extend_timeout); + let watchfile_path = opt.watch.clone(); + spawn(async move { + loop { + select! { + _ = extend_timeout.notified() => {} + _ = sleep(duration) => break, + } + } + + if let Some(path) = watchfile_path { + let _ = remove_file(path); + } + + process::exit(0); + }); + } + + if let Some(path) = &opt.watch { + let mut watcher = Hotwatch::new()?; + let render = Arc::new(Notify::new()); + + { + let render = Arc::clone(&render); + watcher.watch(path, move |_ev| { + render.notify_waiters(); + extend_timeout.notify_waiters(); + })?; + } + + loop { + render.notified().await; + let new_volume = get_volume()?; + if new_volume == volume { + continue; + } + + volume = new_volume; + let rendered = render_bars(&opt, volume)?; + draw_bars(&rendered)?; + } + } + + if opt.timeout.is_some() { + return pending().await; } Ok(())