199 lines
5.0 KiB
Rust
199 lines
5.0 KiB
Rust
use std::io;
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use std::collections::HashSet;
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use std::process::Command;
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use std::num::ParseIntError;
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use std::string::FromUtf8Error;
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/// The different kinds of errors that can happen.
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#[derive(Debug)]
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pub enum Error {
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/// An io::Error happened while running the xrandr command.
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IoError(io::Error),
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/// An error happened while parsing the xrandr output to a string
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Utf8Error(FromUtf8Error),
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/// An error happened while parsing the resolution of a xrandr screen.
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ParseIntError(ParseIntError),
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}
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impl From<io::Error> for Error {
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fn from(e: io::Error) -> Error {
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Error::IoError(e)
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}
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}
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impl From<FromUtf8Error> for Error {
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fn from(e: FromUtf8Error) -> Error {
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Error::Utf8Error(e)
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}
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}
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impl From<ParseIntError> for Error {
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fn from(e: ParseIntError) -> Error {
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Error::ParseIntError(e)
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}
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}
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/// A struct that represents a screen and its supported resolutions.
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#[derive(Debug)]
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pub struct Screen {
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/// The name of the screen received from xrandr.
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name: String,
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/// The available resolutions of the screen.
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resolutions: Vec<(u32, u32)>,
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/// Whether the screen is primary or not
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primary: bool,
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/// Whether the screen is connected or not.
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connected: bool,
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}
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impl Screen {
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/// Creates a screen from the first line in the xrandr command.
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pub fn from_line(line: &str) -> Screen {
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let split = line.split_whitespace().collect::<Vec<_>>();
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Screen {
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name: split[0].to_string(),
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resolutions: vec![],
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primary: line.contains("primary"),
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connected: line.contains(" connected"),
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}
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}
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/// Finds the best common resolution between two screens.
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fn best_common_resolution(&self, other: &Screen) -> Option<(u32, u32)> {
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let self_res: HashSet<(u32, u32)> = self.resolutions.clone().into_iter().collect();
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let other_res: HashSet<(u32, u32)> = other.resolutions.clone().into_iter().collect();
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let intersection = self_res.intersection(&other_res);
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let mut output = None;
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for element in intersection {
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if let Some(res) = output {
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if element > &res {
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output = Some(*element);
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}
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}
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}
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output
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}
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}
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/// A struct that contains all the screens and allows to manage them.
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#[derive(Debug)]
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pub struct MultiScreen {
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/// All the contained screens.
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pub(crate) screens: Vec<Screen>,
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}
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impl MultiScreen {
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/// Finds all the screens by spawning and parsing the output of xrandr.
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pub fn detect() -> Result<MultiScreen, Error> {
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let mut screens = vec![];
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let xrandr = Command::new("xrandr")
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.output()?;
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let output = String::from_utf8(xrandr.stdout)?;
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let output = output.split('\n').skip(1);
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for line in output {
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if line.is_empty() {
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continue;
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}
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if line.contains("connected") {
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screens.push(Screen::from_line(line));
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} else if let Some(mut last) = screens.last_mut() {
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// Get the first thing
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let split = line.split_whitespace().collect::<Vec<_>>();
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// Remove the _ with the frequency
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let resolution = split[0]
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.split("_").collect::<Vec<_>>()[0]
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.split("x").collect::<Vec<_>>();
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last.resolutions.push((
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resolution[0].parse::<u32>()?,
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resolution[1].parse::<u32>()?,
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));
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}
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}
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for screen in &mut screens {
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screen.resolutions.sort();
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}
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Ok(MultiScreen { screens: screens })
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}
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/// Returns the arguments of xrandr that disable all screens except the primary.
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pub fn only_primary_args(&self) -> Vec<&str> {
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let mut primary_found = false;
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let mut args = vec![];
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for screen in &self.screens {
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if ! screen.primary || primary_found {
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args.push("--output");
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args.push(&screen.name);
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args.push("--off");
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} else {
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args.push("--output");
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args.push(&screen.name);
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args.push("--auto");
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primary_found = true;
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}
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}
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args
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}
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/// Returns the arguments to duplicate the screens.
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pub fn duplicate_args(&self) -> Vec<&str> {
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panic!("Not implemented yet");
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vec![]
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}
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/// Calls the xrandr program to disable all screens except the primary.
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pub fn only_primary(&self) -> Result<(), Error> {
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self.run_command(self.only_primary_args())
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}
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/// Calls the xrandr program to duplicate the screens.
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pub fn duplicate(&self) -> Result<(), Error> {
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self.run_command(self.duplicate_args())
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}
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/// Run an xrandr command with its args.
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pub fn run_command(&self, args: Vec<&str>) -> Result<(), Error> {
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Command::new("xrandr")
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.args(args)
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.spawn()?
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.wait()?;
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Ok(())
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}
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}
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