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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/pkg/arch/.SRCINFO b/pkg/arch/.SRCINFO new file mode 100644 index 0000000..2f2f5e9 --- /dev/null +++ b/pkg/arch/.SRCINFO @@ -0,0 +1,17 @@ +pkgbase = screencfg-git + pkgdesc = Automatically configure your screen setup + pkgver = 0.1.r0.g1e8bf1d + pkgrel = 1 + url = https://github.com/hakoerber/screencfg + arch = x86_64 + license = GPL-3.0-only + makedepends = cargo + makedepends = git + depends = glibc + depends = gcc-libs + provides = screencfg + conflicts = screencfg + source = screencfg-git::git+https://github.com/hakoerber/screencfg#branch=master + sha256sums = SKIP + +pkgname = screencfg-git diff --git a/pkg/arch/.gitignore b/pkg/arch/.gitignore new file mode 100644 index 0000000..a980af0 --- /dev/null +++ b/pkg/arch/.gitignore @@ -0,0 +1,4 @@ +* +!/.gitignore +!/PKGBUILD +!/.SRCINFO diff --git a/pkg/arch/PKGBUILD b/pkg/arch/PKGBUILD new file mode 100644 index 0000000..005a5b4 --- /dev/null +++ b/pkg/arch/PKGBUILD @@ -0,0 +1,43 @@ +# Maintainer: Hannes Körber +pkgname='screencfg-git' +pkgver=0.1.r0.g1e8bf1d +pkgrel=1 +pkgdesc='Automatically configure your screen setup' +arch=('x86_64') +url='https://github.com/hakoerber/screencfg' +license=('GPL-3.0-only') +depends=('glibc' 'gcc-libs') +makedepends=('cargo' 'git') +provides=('screencfg') +conflicts=('screencfg') +source=("${pkgname}::git+https://github.com/hakoerber/screencfg#branch=master") +sha256sums=('SKIP') + +pkgver() { + cd "${pkgname}" + git describe --long --tags --abbrev=7 | sed 's/^v//;s/\([^-]*-g\)/r\1/;s/-/./g' +} + +prepare() { + cd "${pkgname}" + export RUSTUP_TOOLCHAIN=stable + cargo fetch --locked --target "$(rustc -vV | sed -n 's/host: //p')" +} + +build() { + cd "${pkgname}" + export RUSTUP_TOOLCHAIN=stable + export CARGO_TARGET_DIR=target + cargo build --frozen --release +} + +check() { + cd "${pkgname}" + export RUSTUP_TOOLCHAIN=stable + cargo test --frozen +} + +package() { + cd "${pkgname}" + install -Dm0755 -t "$pkgdir/usr/bin/" "target/release/${pkgname/-git}" +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..9b503e1 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,763 @@ +use std::fmt; +use std::io; +use std::process; +use std::string; + +use clap::{Args, Parser, ValueEnum}; + +#[derive(Debug)] +enum Error { + Command(String), + Classify(String), + Workstation(String), + Plan(String), + Apply(String), +} + +impl fmt::Display for Error { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!( + f, + "{}", + match self { + Error::Command(msg) => format!("command failed: {msg}"), + Error::Classify(msg) => format!("classification failed: {msg}"), + Error::Workstation(msg) => format!("workstation failed: {msg}"), + Error::Plan(msg) => format!("plan failed: {msg}"), + Error::Apply(msg) => format!("apply failed: {msg}"), + }, + ) + } +} + +impl From for Error { + fn from(value: io::Error) -> Self { + Self::Command(value.to_string()) + } +} + +impl From for Error { + fn from(value: string::FromUtf8Error) -> Self { + Self::Command(value.to_string()) + } +} + +impl std::error::Error for Error {} + +#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)] +enum MonitorClass { + Laptop, + External, +} + +impl TryFrom<&str> for MonitorClass { + type Error = Error; + + fn try_from(value: &str) -> Result { + if value.starts_with("eDP-") { + Ok(Self::Laptop) + } else if value.starts_with("DP-") || value.starts_with("HDMI-") { + Ok(Self::External) + } else { + Err(Error::Classify(format!( + "could not classify monitor: {value}" + ))) + } + } +} + +#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] +struct Monitor { + name: String, + class: MonitorClass, +} + +impl Monitor { + fn on(self) -> MonitorSetting { + MonitorSetting { + monitor: self, + state: MonitorState::On, + } + } + + fn off(self) -> MonitorSetting { + MonitorSetting { + monitor: self, + state: MonitorState::Off, + } + } +} + +#[derive(Debug, PartialEq, Eq)] +struct Workstation { + laptop: Option, + externals: Option<(Monitor, Vec)>, +} + +impl TryFrom> for Workstation { + type Error = Error; + + fn try_from(mut value: Vec) -> Result { + value.sort(); + + let (mut laptops, non_laptops): (Vec<_>, Vec<_>) = value + .into_iter() + .partition(|monitor| monitor.class == MonitorClass::Laptop); + + let laptop = match laptops.len() { + 0 => None, + 1 => Some(laptops.remove(0)), + _ => { + return Err(Error::Workstation( + "found more than one laptop screen".into(), + )) + } + }; + + let (mut externals, rest): (Vec<_>, Vec<_>) = non_laptops + .into_iter() + .partition(|monitor| monitor.class == MonitorClass::External); + + if laptop.is_none() && externals.is_empty() { + return Err(Error::Workstation("no screens found".to_string())); + } + + let externals = match externals.len() { + 0 => None, + _ => Some((externals.remove(0), externals)), + }; + + assert_eq!(rest.len(), 0); + + Ok(Self { laptop, externals }) + } +} + +#[derive(Debug, PartialEq, Eq)] +enum MonitorState { + On, + Off, +} + +#[derive(Debug, PartialEq, Eq)] +struct MonitorSetting { + monitor: Monitor, + state: MonitorState, +} + +#[derive(Debug, PartialEq, Eq)] +struct Plan { + monitors: Vec, +} + +impl Plan { + fn command(&self) -> (String, Vec) { + let mut args = vec![]; + + let mut left: Option<&MonitorSetting> = None; + + for monitor in &self.monitors { + args.push("--output".into()); + args.push(monitor.monitor.name.clone()); + + match monitor.state { + MonitorState::On => { + args.push("--auto".into()); + if let Some(left) = left { + args.push("--right-of".into()); + args.push(left.monitor.name.clone()); + } + left = Some(monitor); + } + MonitorState::Off => args.push("--off".into()), + }; + } + + ("xrandr".into(), args) + } + + fn apply(self) -> Result<(String, Vec), Error> { + let (program, args) = self.command(); + let output = process::Command::new(&program).args(&args).output()?; + + let _ = output + .status + .success() + .then_some(()) + .ok_or(Error::Apply(String::from_utf8(output.stderr)?)); + + Ok((program, args)) + } +} + +impl fmt::Display for Plan { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + let active_monitors = self + .monitors + .iter() + .filter(|monitor| monitor.state == MonitorState::On) + .collect::>(); + + let padding_top = active_monitors + .iter() + .map(|monitor| "─".repeat(monitor.monitor.name.len())) + .collect::>() + .join("─┬─"); + + let padding_bottom = active_monitors + .iter() + .map(|monitor| "─".repeat(monitor.monitor.name.len())) + .collect::>() + .join("─┴─"); + + writeln!( + f, + "┌{}┐\n┆ ╭─{padding_top}─╮ ┆", + "┄".repeat(padding_top.chars().count() + 2 * 2 + 2) + )?; + writeln!( + f, + "┆ │ {} │ ┆", + active_monitors + .into_iter() + .map(|monitor| monitor.monitor.name.clone()) + .collect::>() + .join(" │ ") + )?; + write!( + f, + "┆ ╰─{padding_bottom}─╯ ┆\n└{}┘", + "┄".repeat(padding_bottom.chars().count() + 2 * 2 + 2) + )?; + Ok(()) + } +} + +impl Workstation { + fn plan(&self, setup: Setup) -> Result { + match setup { + Setup::LaptopLeft => match self.laptop { + None => Err(Error::Plan("no laptop screen found".to_string())), + Some(ref laptop) => Ok(Plan { + monitors: { + let mut v = vec![laptop.clone().on()]; + v.append({ + &mut match &self.externals { + None => { + return Err(Error::Plan( + "no external screens found".to_string(), + )) + } + Some((ext, rest)) => { + let mut v = vec![ext.clone().on()]; + v.append( + &mut rest.iter().map(|ext| ext.clone().on()).collect(), + ); + v + } + } + }); + v + }, + }), + }, + Setup::LaptopRight => match self.laptop { + None => Err(Error::Plan("no laptop screen found".to_string())), + Some(ref laptop) => Ok(Plan { + monitors: { + let mut v = match &self.externals { + None => { + return Err(Error::Plan("no external screens found".to_string())) + } + Some((ext, rest)) => { + let mut v = vec![ext.clone().on()]; + v.append(&mut rest.iter().map(|ext| ext.clone().on()).collect()); + v + } + }; + v.push(laptop.clone().on()); + v + }, + }), + }, + Setup::LaptopOnly => match self.laptop { + None => Err(Error::Plan("no laptop screen found".to_string())), + Some(ref laptop) => Ok(Plan { + monitors: { + let mut v = vec![laptop.clone().on()]; + v.append({ + &mut match &self.externals { + None => vec![], + Some((ext, rest)) => { + let mut v = vec![ext.clone().off()]; + v.append( + &mut rest.iter().map(|ext| ext.clone().off()).collect(), + ); + v + } + } + }); + v + }, + }), + }, + Setup::ExternalOnly => match &self.externals { + None => Err(Error::Plan("no external screens found".to_string())), + Some((ext, rest)) => Ok(Plan { + monitors: { + let mut v = { + let mut v = vec![ext.clone().on()]; + v.append( + &mut rest.iter().map(|monitor| monitor.clone().on()).collect(), + ); + v + }; + if let Some(laptop) = &self.laptop { + v.push(laptop.clone().off()); + } + v + }, + }), + }, + } + } +} + +#[derive(Debug, PartialEq, Eq)] +enum OutputState { + Connected, + Disconnected, +} + +impl TryFrom<&str> for OutputState { + type Error = Error; + + fn try_from(value: &str) -> Result { + match value { + "connected" => Ok(Self::Connected), + "disconnected" => Ok(Self::Disconnected), + _ => Err(Error::Command(format!( + "unknown xrandr output state: {value}" + ))), + } + } +} + +struct Output { + name: String, + state: OutputState, +} + +impl Monitor { + fn new(name: &str) -> Result { + Ok(Self { + name: name.into(), + class: name.try_into()?, + }) + } + + fn findall() -> Result, Error> { + String::from_utf8( + process::Command::new("xrandr") + .arg("--query") + .output()? + .stdout, + )? + .lines() + .skip(1) // skip header + .filter(|line| { + if let Some(c) = line.chars().next() { + c.is_alphabetic() + } else { + false + } + }) + .map(|line| { + let mut parts = line.split_whitespace(); + match (parts.next(), parts.next()) { + (Some(part_1), Some(part_2)) => Ok(Output { + name: part_1.to_string(), + state: part_2.try_into()?, + }), + _ => Err(Error::Command(format!( + "not enough output information in line: {line}" + ))), + } + }) + .filter(|result| { + result + .as_ref() + .map(|output| output.state == OutputState::Connected) + .unwrap_or(true) + }) + .flat_map(|result| result.map(|output| Self::new(&output.name))) + .collect::, Error>>() + .map(|mut monitors| { + monitors.sort(); + monitors + }) + } +} + +#[derive(Clone, Copy, Debug, ValueEnum)] +enum Setup { + LaptopLeft, + LaptopRight, + LaptopOnly, + ExternalOnly, +} + +#[derive(Clone, Debug, Args)] +#[group(multiple = false, required = true)] +struct Approach { + #[arg(long)] + setup: Option, + + #[arg(long)] + best: bool, +} + +#[derive(Debug, Parser)] +#[command(version, about)] +struct Cli { + #[command(flatten)] + approach: Approach, + + #[arg(long)] + dry_run: bool, + + #[arg(long)] + diagram: bool, +} + +fn run() -> Result<(), Error> { + let args = Cli::parse(); + + let monitors = Monitor::findall()?; + let workstation: Workstation = monitors.try_into()?; + + let plan = if let Some(setup) = args.approach.setup { + workstation.plan(setup)? + } else { + workstation + .plan(Setup::LaptopLeft) + .or_else(|_| workstation.plan(Setup::LaptopOnly)) + .or_else(|_| workstation.plan(Setup::ExternalOnly)) + .map_err(|_| Error::Plan("no plan fit with \"best\" strategy".to_string()))? + }; + + if args.diagram { + println!("{plan}"); + } + + let command = if args.dry_run { + plan.command() + } else { + plan.apply()? + }; + + println!("{} {}", command.0, command.1.join(" ")); + + Ok(()) +} + +fn main() -> process::ExitCode { + process::ExitCode::from(match run() { + Ok(()) => 0, + Err(e) => { + println!("{e}"); + 1 + } + }) +} + +#[cfg(test)] +mod tests { + use super::*; + + enum PlanExpect<'a> { + Error, + Valid(Plan, &'a str), + } + + #[test] + fn single_laptop() -> Result<(), Error> { + let laptop = Monitor { + name: "eDP-1".to_string(), + class: MonitorClass::Laptop, + }; + + let monitors = vec![laptop.clone()]; + + let workstation: Workstation = monitors.try_into()?; + + assert_eq!( + &workstation, + &Workstation { + laptop: Some(laptop.clone()), + externals: None + } + ); + + for (setup, expect) in [ + (Setup::LaptopLeft, PlanExpect::Error), + (Setup::LaptopRight, PlanExpect::Error), + ( + Setup::LaptopOnly, + PlanExpect::Valid( + Plan { + monitors: vec![laptop.on()], + }, + "--output eDP-1 --auto", + ), + ), + (Setup::ExternalOnly, PlanExpect::Error), + ] { + let result = workstation.plan(setup); + match expect { + PlanExpect::Error => assert!(result.is_err()), + PlanExpect::Valid(plan, cmd) => { + assert_eq!(result?, plan); + assert_eq!(plan.command().1.join(" "), cmd); + } + } + } + + Ok(()) + } + + #[test] + fn multiple_laptops() -> Result<(), Error> { + let laptop1 = Monitor { + name: "eDP-1".to_string(), + class: MonitorClass::Laptop, + }; + + let laptop2 = Monitor { + name: "eDP-2".to_string(), + class: MonitorClass::Laptop, + }; + + let monitors = vec![laptop1, laptop2]; + + let workstation: Result = monitors.try_into(); + + assert!(workstation.is_err()); + + Ok(()) + } + + #[test] + fn no_screens() -> Result<(), Error> { + let monitors = vec![]; + + let workstation: Result = monitors.try_into(); + + assert!(workstation.is_err()); + + Ok(()) + } + + #[test] + fn single_external() -> Result<(), Error> { + let external = Monitor { + name: "DP-1".to_string(), + class: MonitorClass::External, + }; + + let monitors = vec![external.clone()]; + + let workstation: Workstation = monitors.try_into()?; + + assert_eq!( + workstation, + Workstation { + laptop: None, + externals: Some((external.clone(), vec![])) + } + ); + + for (setup, expect) in [ + (Setup::LaptopLeft, PlanExpect::Error), + (Setup::LaptopRight, PlanExpect::Error), + (Setup::LaptopOnly, PlanExpect::Error), + ( + Setup::ExternalOnly, + PlanExpect::Valid( + Plan { + monitors: vec![external.on()], + }, + "--output DP-1 --auto", + ), + ), + ] { + let result = workstation.plan(setup); + match expect { + PlanExpect::Error => assert!(result.is_err()), + PlanExpect::Valid(plan, cmd) => { + assert_eq!(result?, plan); + assert_eq!(plan.command().1.join(" "), cmd); + } + } + } + + Ok(()) + } + + #[test] + fn multiple_external() -> Result<(), Error> { + let external1 = Monitor { + name: "DP-1".to_string(), + class: MonitorClass::External, + }; + let external2 = Monitor { + name: "DP-2".to_string(), + class: MonitorClass::External, + }; + let external3 = Monitor { + name: "DP-3".to_string(), + class: MonitorClass::External, + }; + + let monitors = vec![external2.clone(), external3.clone(), external1.clone()]; + + let workstation: Workstation = monitors.try_into()?; + + assert_eq!( + workstation, + Workstation { + laptop: None, + externals: Some(( + external1.clone(), + vec![external2.clone(), external3.clone()] + )) + } + ); + + for (setup, expect) in [ + (Setup::LaptopLeft, PlanExpect::Error), + (Setup::LaptopRight, PlanExpect::Error), + (Setup::LaptopOnly, PlanExpect::Error), + ( + Setup::ExternalOnly, + PlanExpect::Valid( + Plan { + monitors: vec![ + external1.clone().on(), + external2.clone().on(), + external3.on(), + ], + }, + "--output DP-1 --auto --output DP-2 --auto --right-of DP-1 --output DP-3 --auto --right-of DP-2", + ), + ), + ] { + let result = workstation.plan(setup); + match expect { + PlanExpect::Error => assert!(result.is_err()), + PlanExpect::Valid(plan, cmd) => { + assert_eq!(result?, plan); + assert_eq!(plan.command().1.join(" "), cmd); + } + } + } + + Ok(()) + } + + #[test] + fn mixture() -> Result<(), Error> { + let external1 = Monitor { + name: "DP-1".to_string(), + class: MonitorClass::External, + }; + + let external2 = Monitor { + name: "DP-2".to_string(), + class: MonitorClass::External, + }; + + let laptop = Monitor { + name: "eDP-1".to_string(), + class: MonitorClass::Laptop, + }; + + let monitors = vec![external2.clone(), laptop.clone(), external1.clone()]; + + let workstation: Workstation = monitors.try_into()?; + + assert_eq!( + workstation, + Workstation { + laptop: Some(laptop.clone()), + externals: Some((external1.clone(), vec![external2.clone()])) + } + ); + + for (setup, expect) in [ + ( + Setup::LaptopLeft, + PlanExpect::Valid( + Plan { + monitors: vec![ + laptop.clone().on(), + external1.clone().on(), + external2.clone().on(), + ], + }, + "--output eDP-1 --auto --output DP-1 --auto --right-of eDP-1 --output DP-2 --auto --right-of DP-1", + ), + ), + ( + Setup::LaptopRight, + PlanExpect::Valid( + Plan { + monitors: vec![ + external1.clone().on(), + external2.clone().on(), + laptop.clone().on(), + ], + }, + "--output DP-1 --auto --output DP-2 --auto --right-of DP-1 --output eDP-1 --auto --right-of DP-2", + ), + ), + ( + Setup::LaptopOnly, + PlanExpect::Valid( + Plan { + monitors: vec![ + laptop.clone().on(), + external1.clone().off(), + external2.clone().off(), + ], + }, + "--output eDP-1 --auto --output DP-1 --off --output DP-2 --off", + ), + ), + ( + Setup::ExternalOnly, + PlanExpect::Valid( + Plan { + monitors: vec![ + external1.clone().on(), + external2.clone().on(), + laptop.clone().off(), + ], + }, + "--output DP-1 --auto --output DP-2 --auto --right-of DP-1 --output eDP-1 --off", + ), + ), + ] { + let result = workstation.plan(setup); + match expect { + PlanExpect::Error => assert!(result.is_err()), + PlanExpect::Valid(plan, cmd) => { + assert_eq!(result?, plan); + assert_eq!(plan.command().1.join(" "), cmd); + } + } + } + + Ok(()) + } +}