| 1 | //! `budctl`: control wireless earbuds from Linux. |
| 2 | //! |
| 3 | //! A thin layer over budctl-core: parse the command line, run one command, print the result, |
| 4 | //! turn errors into the exit codes listed in CLAUDE.md. |
| 5 | |
| 6 | mod output; |
| 7 | |
| 8 | use std::io::{self, Write}; |
| 9 | use std::process::ExitCode; |
| 10 | |
| 11 | use budctl_core::bt::BdAddr; |
| 12 | use budctl_core::status::{AncLevel, EqBand, NoiseMode}; |
| 13 | use budctl_core::{Error, Kind}; |
| 14 | use clap::{Parser, Subcommand, ValueEnum}; |
| 15 | |
| 16 | /// Control wireless earbuds from Linux, without the vendor app. |
| 17 | #[derive(Parser)] |
| 18 | #[command(name = "budctl", version)] |
| 19 | struct Cli { |
| 20 | /// The buds to use, when more than one supported pair is paired. |
| 21 | #[arg(long, global = true, value_name = "MAC")] |
| 22 | device: Option<BdAddr>, |
| 23 | |
| 24 | /// Machine-readable output (JSON with "schema": 1). |
| 25 | #[arg(long, global = true)] |
| 26 | json: bool, |
| 27 | |
| 28 | /// Hex-dump every frame sent and received on stderr. |
| 29 | #[arg(long, global = true)] |
| 30 | debug: bool, |
| 31 | |
| 32 | #[command(subcommand)] |
| 33 | command: Command, |
| 34 | } |
| 35 | |
| 36 | #[derive(Subcommand)] |
| 37 | enum Command { |
| 38 | /// Paired devices and whether budctl recognizes them. |
| 39 | List, |
| 40 | /// Battery, noise control, EQ and switches. |
| 41 | Status, |
| 42 | /// Touch controls (gesture table) of each bud, or give one gesture a new action. |
| 43 | /// |
| 44 | /// Gestures: double-tap, triple-tap, hold. Actions: none, play-pause, next, previous, |
| 45 | /// voice-assistant, volume-up, volume-down, noise-cycle, game-mode (not every gesture takes |
| 46 | /// every action). `budctl touch cycle …` sets what a hold steps through. |
| 47 | #[command(args_conflicts_with_subcommands = true)] |
| 48 | Touch { |
| 49 | #[command(subcommand)] |
| 50 | cycle: Option<TouchCommand>, |
| 51 | /// The bud to change: left, right, or both. |
| 52 | #[arg(value_enum, requires = "gesture")] |
| 53 | side: Option<Side>, |
| 54 | /// The gesture to change. |
| 55 | #[arg(requires = "action")] |
| 56 | gesture: Option<String>, |
| 57 | /// Its new action. |
| 58 | action: Option<String>, |
| 59 | /// Read the table and show the write, but send nothing. |
| 60 | #[arg(long, requires = "side")] |
| 61 | dry_run: bool, |
| 62 | }, |
| 63 | /// Set noise control, then read it back. |
| 64 | Anc { |
| 65 | #[arg(value_enum)] |
| 66 | mode: AncArg, |
| 67 | }, |
| 68 | /// List the EQ presets, or select one (pure-raw, deep-bass, pure-vocals, pure-bass, custom-<id>) and read it back. |
| 69 | /// |
| 70 | /// For a custom preset, `<hz>=<gain>` pairs change those bands' gains (dB), then save and |
| 71 | /// select it: `budctl eq custom-4 50=+3 16000=-2`. `budctl eq new <name>` creates a preset. |
| 72 | #[command(args_conflicts_with_subcommands = true)] |
| 73 | Eq { |
| 74 | #[command(subcommand)] |
| 75 | action: Option<EqCommand>, |
| 76 | preset: Option<String>, |
| 77 | /// Bands to change, as `<hz>=<gain>`. Custom presets only. |
| 78 | #[arg(requires = "preset", value_parser = parse_band, allow_negative_numbers = true)] |
| 79 | bands: Vec<EqBand>, |
| 80 | }, |
| 81 | /// Turn an on/off setting on or off, then read it back. Switches: game, bass-boost, spatial (3D sound), wind, dual. |
| 82 | Set { |
| 83 | /// The switch's name, as `status --json` lists it. |
| 84 | switch: String, |
| 85 | #[arg(value_enum)] |
| 86 | state: OnOff, |
| 87 | }, |
| 88 | /// Set the bass level, -5 to +5. The buds cannot report it back, so only their ack is checked. |
| 89 | Bass { |
| 90 | /// Checked here, before connecting; core checks it again. |
| 91 | #[arg(allow_negative_numbers = true, value_parser = clap::value_parser!(i8).range(-5..=5))] |
| 92 | level: i8, |
| 93 | }, |
| 94 | /// Ring the buds so you can find them (loud: take them out of your ears first). |
| 95 | Find { |
| 96 | #[arg(value_enum)] |
| 97 | action: FindAction, |
| 98 | /// Confirm that the buds are out of your ears. Needed to start ringing. |
| 99 | #[arg(long)] |
| 100 | yes: bool, |
| 101 | }, |
| 102 | /// Turn game mode (low latency) on or off, then read it back. |
| 103 | Game { |
| 104 | #[arg(value_enum)] |
| 105 | state: OnOff, |
| 106 | }, |
| 107 | } |
| 108 | |
| 109 | #[derive(Clone, Copy, ValueEnum)] |
| 110 | enum FindAction { |
| 111 | Start, |
| 112 | Stop, |
| 113 | } |
| 114 | |
| 115 | #[derive(Subcommand)] |
| 116 | enum EqCommand { |
| 117 | /// Create a custom preset, flat, with the bands of the buds' custom presets, then read it back. |
| 118 | New { |
| 119 | /// Its name, 1 to 16 bytes. |
| 120 | #[arg(value_parser = parse_name)] |
| 121 | name: String, |
| 122 | }, |
| 123 | } |
| 124 | |
| 125 | #[derive(Subcommand)] |
| 126 | enum TouchCommand { |
| 127 | /// Set the noise-control modes a hold steps through (both buds), then read it back. |
| 128 | /// |
| 129 | /// At least two modes. The buds step through them in their own order. |
| 130 | Cycle { |
| 131 | #[arg(value_enum, required = true, num_args = 2..=3, value_name = "MODE")] |
| 132 | modes: Vec<CycleMode>, |
| 133 | }, |
| 134 | } |
| 135 | |
| 136 | #[derive(Clone, Copy, PartialEq, Eq, ValueEnum)] |
| 137 | enum CycleMode { |
| 138 | Off, |
| 139 | Transparency, |
| 140 | /// Noise cancelling. |
| 141 | Anc, |
| 142 | } |
| 143 | |
| 144 | impl CycleMode { |
| 145 | fn name(self) -> &'static str { |
| 146 | match self { |
| 147 | CycleMode::Off => "off", |
| 148 | CycleMode::Transparency => "transparency", |
| 149 | CycleMode::Anc => "anc", |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | #[derive(Clone, Copy, ValueEnum)] |
| 155 | enum Side { |
| 156 | Left, |
| 157 | Right, |
| 158 | /// The left and the right bud. |
| 159 | Both, |
| 160 | } |
| 161 | |
| 162 | impl Side { |
| 163 | fn name(self) -> &'static str { |
| 164 | match self { |
| 165 | Side::Left => "left", |
| 166 | Side::Right => "right", |
| 167 | Side::Both => "both", |
| 168 | } |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | #[derive(Clone, Copy, ValueEnum)] |
| 173 | enum OnOff { |
| 174 | On, |
| 175 | Off, |
| 176 | } |
| 177 | |
| 178 | #[derive(Clone, Copy, ValueEnum)] |
| 179 | enum AncArg { |
| 180 | Off, |
| 181 | Transparency, |
| 182 | /// Noise cancelling at the deep level (the buds use the same value for both). |
| 183 | On, |
| 184 | Light, |
| 185 | Medium, |
| 186 | Deep, |
| 187 | } |
| 188 | |
| 189 | impl From<AncArg> for NoiseMode { |
| 190 | fn from(arg: AncArg) -> Self { |
| 191 | match arg { |
| 192 | AncArg::Off => NoiseMode::Off, |
| 193 | AncArg::On | AncArg::Deep => NoiseMode::Anc(AncLevel::Deep), |
| 194 | AncArg::Light => NoiseMode::Anc(AncLevel::Light), |
| 195 | AncArg::Medium => NoiseMode::Anc(AncLevel::Medium), |
| 196 | AncArg::Transparency => NoiseMode::Transparency, |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | fn main() -> ExitCode { |
| 202 | let cli = match Cli::try_parse() { |
| 203 | Ok(cli) => cli, |
| 204 | Err(error) => { |
| 205 | // Help and version are not errors; everything else is a usage error (exit 1). |
| 206 | let code = if error.use_stderr() { 1 } else { 0 }; |
| 207 | // Nothing useful can be done if printing the usage message fails. |
| 208 | let _ = error.print(); |
| 209 | return ExitCode::from(code); |
| 210 | } |
| 211 | }; |
| 212 | if cli.debug { |
| 213 | budctl_core::debug::enable(); |
| 214 | } |
| 215 | |
| 216 | let mut stdout = io::stdout().lock(); |
| 217 | let result = run(&cli, &mut stdout).and_then(|()| stdout.flush().map_err(output::Failure::Io)); |
| 218 | match result { |
| 219 | Ok(()) => ExitCode::SUCCESS, |
| 220 | // `budctl status | head -1` is fine. |
| 221 | Err(output::Failure::Io(e)) if e.kind() == io::ErrorKind::BrokenPipe => ExitCode::SUCCESS, |
| 222 | Err(output::Failure::Io(e)) => { |
| 223 | eprintln!("budctl: cannot write output: {e}"); |
| 224 | ExitCode::from(1) |
| 225 | } |
| 226 | Err(output::Failure::Budctl(e)) => { |
| 227 | eprintln!("budctl: {e}"); |
| 228 | ExitCode::from(exit_code(&e)) |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | fn run(cli: &Cli, out: &mut impl Write) -> Result<(), output::Failure> { |
| 234 | // Checked before connecting: ringing is loud. Spec: realme_t310.md#find |
| 235 | if let Command::Find { |
| 236 | action: FindAction::Start, |
| 237 | yes: false, |
| 238 | } = cli.command |
| 239 | { |
| 240 | return Err(Error::Usage( |
| 241 | "this rings the buds loudly; take them out of your ears, then run `budctl find start --yes`".to_owned(), |
| 242 | ) |
| 243 | .into()); |
| 244 | } |
| 245 | let found = budctl_core::scan()?; |
| 246 | if let Command::List = cli.command { |
| 247 | return output::list(out, &found, cli.json); |
| 248 | } |
| 249 | |
| 250 | let (device, model) = budctl_core::select(found, cli.device)?; |
| 251 | let mut session = budctl_core::connect(&device, model)?; |
| 252 | match cli.command { |
| 253 | Command::List => Ok(()), |
| 254 | Command::Status => { |
| 255 | let status = session.status()?; |
| 256 | output::status(out, &device, model, &status, cli.json) |
| 257 | } |
| 258 | Command::Touch { |
| 259 | cycle: Some(TouchCommand::Cycle { ref modes }), |
| 260 | .. |
| 261 | } => { |
| 262 | let names: Vec<&str> = modes.iter().map(|m| m.name()).collect(); |
| 263 | let now = session.set_hold_cycle(&names)?; |
| 264 | output::hold_cycle(out, &device, model, &now, cli.json) |
| 265 | } |
| 266 | Command::Touch { |
| 267 | side: Some(side), |
| 268 | gesture: Some(ref gesture), |
| 269 | action: Some(ref action), |
| 270 | dry_run, |
| 271 | .. |
| 272 | } => { |
| 273 | let change = session.set_touch(side.name(), gesture, action, dry_run)?; |
| 274 | output::touch_change(out, &device, model, &change, cli.json) |
| 275 | } |
| 276 | Command::Touch { .. } => { |
| 277 | let touch = session.touch_controls()?; |
| 278 | output::touch(out, &device, model, &touch, cli.json) |
| 279 | } |
| 280 | Command::Anc { mode } => { |
| 281 | let now = session.set_noise_control(mode.into())?; |
| 282 | output::noise_control(out, &device, model, &now, cli.json) |
| 283 | } |
| 284 | Command::Eq { |
| 285 | action: Some(EqCommand::New { ref name }), |
| 286 | .. |
| 287 | } => { |
| 288 | let created = session.create_custom_eq(name)?; |
| 289 | output::created_eq(out, &device, model, &created, cli.json) |
| 290 | } |
| 291 | Command::Eq { preset: None, .. } => { |
| 292 | let presets = session.eq_presets()?; |
| 293 | output::eq_presets(out, &device, model, &presets, cli.json) |
| 294 | } |
| 295 | Command::Eq { |
| 296 | preset: Some(ref preset), |
| 297 | ref bands, |
| 298 | .. |
| 299 | } if !bands.is_empty() => { |
| 300 | let now = session.set_custom_eq(preset, bands)?; |
| 301 | output::custom_eq(out, &device, model, &now, cli.json) |
| 302 | } |
| 303 | Command::Eq { |
| 304 | preset: Some(ref preset), |
| 305 | .. |
| 306 | } => { |
| 307 | let now = session.set_eq(preset)?; |
| 308 | output::eq(out, &device, model, &now, cli.json) |
| 309 | } |
| 310 | Command::Set { ref switch, state } => { |
| 311 | let now = session.set_switch(switch, matches!(state, OnOff::On))?; |
| 312 | output::switch(out, &device, model, &now, cli.json) |
| 313 | } |
| 314 | Command::Bass { level } => { |
| 315 | session.set_bass_level(level)?; |
| 316 | output::bass_level(out, &device, model, level, cli.json) |
| 317 | } |
| 318 | Command::Find { action, .. } => { |
| 319 | let ring = matches!(action, FindAction::Start); |
| 320 | session.find(ring)?; |
| 321 | output::find(out, &device, model, ring, cli.json) |
| 322 | } |
| 323 | Command::Game { state } => { |
| 324 | let now = session.set_switch("game", matches!(state, OnOff::On))?; |
| 325 | output::switch(out, &device, model, &now, cli.json) |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /// A preset name, checked before connecting: not empty, no spaces around it, no control |
| 331 | /// characters. The buds' own limits are checked once their list is read. |
| 332 | fn parse_name(text: &str) -> Result<String, String> { |
| 333 | if text.is_empty() || text.trim() != text { |
| 334 | return Err("a preset name cannot be empty, or start or end with a space".to_owned()); |
| 335 | } |
| 336 | if text.chars().any(char::is_control) { |
| 337 | return Err("a preset name cannot hold control characters".to_owned()); |
| 338 | } |
| 339 | Ok(text.to_owned()) |
| 340 | } |
| 341 | |
| 342 | /// `50=+3` → 50 Hz at +3 dB. |
| 343 | fn parse_band(text: &str) -> Result<EqBand, String> { |
| 344 | let (hz, gain) = text |
| 345 | .split_once('=') |
| 346 | .ok_or_else(|| format!("{text} is not <hz>=<gain>, e.g. 50=+3"))?; |
| 347 | Ok(EqBand { |
| 348 | hz: hz.parse().map_err(|_| format!("{hz} is not a frequency in Hz"))?, |
| 349 | gain: gain.parse().map_err(|_| format!("{gain} is not a gain in whole dB"))?, |
| 350 | }) |
| 351 | } |
| 352 | |
| 353 | /// Exit codes from CLAUDE.md: 1 usage, 2 not found, 3 busy, 4 rejected or timed out. |
| 354 | fn exit_code(error: &Error) -> u8 { |
| 355 | match error.kind() { |
| 356 | Kind::Usage => 1, |
| 357 | Kind::NotFound => 2, |
| 358 | Kind::Busy => 3, |
| 359 | Kind::Failed => 4, |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | #[cfg(test)] |
| 364 | mod tests { |
| 365 | use super::*; |
| 366 | |
| 367 | fn parse(args: &[&str]) -> Command { |
| 368 | Cli::try_parse_from(std::iter::once("budctl").chain(args.iter().copied())) |
| 369 | .unwrap() |
| 370 | .command |
| 371 | } |
| 372 | |
| 373 | #[test] |
| 374 | fn eq_takes_a_preset_bands_or_new() { |
| 375 | assert!(matches!( |
| 376 | parse(&["eq"]), |
| 377 | Command::Eq { |
| 378 | action: None, |
| 379 | preset: None, |
| 380 | .. |
| 381 | } |
| 382 | )); |
| 383 | assert!(matches!( |
| 384 | parse(&["eq", "custom-4", "50=+3", "16000=-2"]), |
| 385 | Command::Eq { action: None, preset: Some(p), bands } if p == "custom-4" && bands.len() == 2 |
| 386 | )); |
| 387 | assert!(matches!( |
| 388 | parse(&["eq", "deep-bass"]), |
| 389 | Command::Eq { action: None, preset: Some(p), .. } if p == "deep-bass" |
| 390 | )); |
| 391 | assert!(matches!( |
| 392 | parse(&["eq", "new", "Gym mix"]), |
| 393 | Command::Eq { action: Some(EqCommand::New { name }), .. } if name == "Gym mix" |
| 394 | )); |
| 395 | } |
| 396 | } |