separate to bin and lib
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319
src/lib.rs
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319
src/lib.rs
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use kdl::KdlDocument;
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use serde_json::{from_str, Value};
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use std::collections::HashMap;
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use std::process::Command;
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use std::{fs, str};
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/// Configuration for swayout.
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struct Config {
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/// Monitor name is independent of output name. It can be anything.
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monitors: HashMap<String, Monitor>,
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/// Definition of layouts: a map of the layout name to the outputs.
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/// The outputs is a map of the monitor name (in `monitors`) to the configuration
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/// of that monitor for this layout.
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/// Available outputs that do not match a monitor in the map are disabled.
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layouts: HashMap<String, HashMap<String, OutputConfig>>,
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}
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/// Defines a monitor by make, model, and serial.
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struct Monitor {
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make: String,
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model: String,
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serial: String,
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}
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/// Configuration for an enabled output.
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struct OutputConfig {
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/// mode. See man 5 sway-output
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mode: String,
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/// scale. See man 5 sway-output
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scale: String,
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/// x value for position. See man 5 sway-output
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x: u16,
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/// y value for position. See man 5 sway-output
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y: u16,
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/// transform. See man 5 sway-output
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transform: String,
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}
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/// An output, as returned by `swaymsg -t get_outputs`.
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struct Output {
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/// output name, according to sway
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name: String,
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make: String,
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model: String,
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serial: String,
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output_config: OutputConfig,
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}
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/// Get all outputs currently available, according to `swaymsg -t get_outputs`.
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fn get_outputs() -> Vec<Output> {
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let output = Command::new("swaymsg")
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.arg("-t")
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.arg("get_outputs")
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.output()
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.expect("swaymsg -t get_outputs failed");
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let json_string = str::from_utf8(&output.stdout).unwrap();
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let json = from_str(json_string).unwrap();
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if let Value::Array(outputs) = json {
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outputs
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.iter()
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.map(|output_json| Output {
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name: String::from(output_json["name"].as_str().unwrap()),
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make: String::from(output_json["make"].as_str().unwrap()),
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model: String::from(output_json["model"].as_str().unwrap()),
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serial: String::from(output_json["serial"].as_str().unwrap()),
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output_config: OutputConfig {
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mode: get_mode(output_json),
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scale: String::from("1.0"),
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x: 0,
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y: 0,
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transform: String::from("normal"),
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},
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})
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.collect()
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} else {
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panic!("outputs json was not an array");
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}
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}
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/// Parse the mode from the output JSON into a string suitable for the mode param for sway-output.
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/// This will go into `OutputConfig.mode`.
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fn get_mode(output: &Value) -> String {
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if let Value::Array(modes) = &output["modes"] {
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if let Some(mode) = modes.first() {
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let width = mode["width"].as_i64().unwrap().to_string();
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let height = mode["height"].as_i64().unwrap().to_string();
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let mut out: String = String::new();
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out.push_str(&width);
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out.push_str("x");
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out.push_str(&height);
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out
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} else {
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panic!("no modes")
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}
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} else {
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panic!("modes not an array")
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}
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}
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/// Get a `Config` from ~/.config/swayout/config.kdl.
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/// (It really uses XDG config dirs.)
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fn get_config() -> Config {
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let xdg_dirs = xdg::BaseDirectories::with_prefix("swayout").unwrap();
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if let Some(path) = xdg_dirs.find_config_file("config.kdl") {
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let kdl = fs::read_to_string(path).expect("error reading file");
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parse_config(kdl)
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} else {
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// no config files, use an empty rules
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Config {
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monitors: HashMap::new(),
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layouts: HashMap::new(),
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}
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}
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}
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fn parse_config(kdl:String) -> Config {
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let doc:KdlDocument = kdl.parse().expect("failed to parse config KDL");
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let monitors:HashMap<String,Monitor> = doc.nodes().iter()
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.filter(|node| node.name().value() == "monitor")
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.map(|monitor_node| {
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let name = String::from(monitor_node[0].as_string().unwrap());
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let monitor = Monitor {
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make : String::from(monitor_node["make"].as_string().unwrap()),
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model : String::from(monitor_node["model"].as_string().unwrap()),
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serial : String::from(monitor_node["serial"].as_string().unwrap()),
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};
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(name, monitor)
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})
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.collect();
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let layouts:HashMap<String,HashMap<String,OutputConfig>> = doc.nodes().iter()
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.filter(|node| node.name().value() == "layout")
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.map(|layout_node| {
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let layout_name = String::from(layout_node[0].as_string().unwrap());
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let monitor_name_to_output_config:HashMap<String,OutputConfig> = layout_node
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.children().unwrap().nodes().iter()
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.map(|output_node| {
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let output = String::from(output_node[0].as_string().unwrap());
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let output_config = OutputConfig {
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mode : String::from(output_node["mode"].as_string().unwrap()),
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scale : String::from(output_node["scale"].as_string().unwrap()),
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transform : String::from(output_node["transform"].as_string().unwrap()),
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x : output_node["x"].as_i64().unwrap() as u16,
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y : output_node["y"].as_i64().unwrap() as u16,
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};
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(output, output_config)
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})
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.collect();
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(layout_name,monitor_name_to_output_config)
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})
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.collect();
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Config { monitors, layouts }
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}
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/// Determine the available layout names.
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/// Return one layout for each layout defined in the configuration file
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/// for which all outputs are available,
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/// one for each monitor defined in the configuration file (for using just that monitor),
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/// and one for each available output that is not a configured monitor (for using just that output).
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fn get_layouts() -> Vec<String> {
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let available_outputs = get_outputs();
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let config = get_config();
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// Get the names of monitors that are available (that match an available output)
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let available_monitor_names:Vec<&String> = config.monitors.iter()
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.filter(|(_monitor_name,monitor)|
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available_outputs.iter().any(|output|
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monitor.make == output.make
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&& monitor.model == output.model
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&& output.serial == monitor.serial
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)
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)
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.map(|(monitor_name,_monitor)| monitor_name)
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.collect();
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let mut layout_names: Vec<String> = Vec::new();
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// Add each layout defined in the config file for which all outputs are available
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config.layouts.iter().for_each(|(layout_name, layout)| {
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if layout
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.iter()
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.all(|(output_name, _output)| available_monitor_names.contains(&output_name))
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{
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layout_names.push(String::from(layout_name))
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}
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});
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// add each individual output (by monitor name if the monitor is defined, else by output name)
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available_outputs.iter().for_each(|output| {
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// if there is a monitor for the output, use the monitor name, else use the output name
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let monitor_opt = config.monitors.iter()
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.find(|(_monitor_name, monitor)| {
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monitor.make == output.make
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&& monitor.model == output.model
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&& monitor.serial == output.serial
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});
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if let Some((monitor_name, _monitor)) = monitor_opt {
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layout_names.push(String::from(monitor_name));
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} else {
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layout_names.push(String::from(&output.name));
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}
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});
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layout_names
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}
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/// Print the name of each layout to standard out, one per line
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pub fn print_layout_names() {
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get_layouts().iter().for_each(|layout| println!("{layout}"))
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}
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/// Apply the specified layout.
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/// layout_name may be the name of a layout in the config, the name of a monitor,
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/// or the name of an output.
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pub fn apply_layout(layout_name: &String) {
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let rules = get_config();
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let outputs = get_outputs();
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// Map of output name to config for all outputs to enable.
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// (All outputs not in this map will be disabled.)
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let mut output_config_map: HashMap<&String, &OutputConfig> = HashMap::new();
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// First check if the layout is defined in the rules
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let opt_layout = rules.layouts.get(layout_name);
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if let Some(layout) = opt_layout {
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// The layout is defined in the rules.
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layout.iter().for_each(|(monitor_name, output_config)| {
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let monitor = &rules.monitors[monitor_name];
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// find the output for the monitor to get the output name.
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let output_opt = outputs.iter().find(|output| {
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output.make == monitor.make
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&& output.model == monitor.model
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&& output.serial == monitor.serial
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});
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if let Some(output) = output_opt {
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output_config_map.insert(&output.name, &output_config);
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} else {
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panic!("Missing output for monitor {monitor_name}");
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}
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});
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} else {
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// The layout is not defined in the rules.
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// See if it is a monitor name...
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if let Some(monitor) = rules.monitors.get(layout_name) {
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// It is a monitor name. Find the matching output...
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if let Some(output) = outputs.iter().find(|output| {
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output.make == monitor.make && output.model == monitor.model
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&& output.serial == monitor.serial
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}) {
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output_config_map.insert(&output.name, &output.output_config);
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} else {
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panic!("could not find output for monitor {layout_name}")
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}
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} else {
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// See if it is an output name...
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if let Some(output) = outputs.iter()
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.find(|output| &output.name == layout_name) {
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output_config_map.insert(&output.name, &output.output_config);
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} else {
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panic!("could not find layout, monitor, or output {layout_name}")
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}
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}
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}
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apply_outputs(&outputs, &output_config_map);
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}
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/// Apply the specified outputs. Enable all outputs in [outputs], disable others.
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fn apply_outputs(all_outputs: &Vec<Output>, outputs: &HashMap<&String, &OutputConfig>) {
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// set enabled outputs first, then set disabled outputs.
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// That way if some work before an error, you have at least one output enabled.
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// for outputs to be enabled: map of output name to config
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let mut enabled: HashMap<&String,&OutputConfig> = HashMap::new();
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// for outputs to be disabled: output names
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let mut disabled: Vec<&String> = Vec::new();
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all_outputs.iter().for_each(|output| {
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if let Some(output_config) = outputs.get(&output.name) {
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enabled.insert(&output.name, &output_config);
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} else {
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disabled.push(&output.name);
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}
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});
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let mut cmd = Command::new("swaymsg");
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enabled.iter().for_each(|(output_name,output_config)| {
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cmd.arg("output");
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cmd.arg(&output_name);
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cmd.arg("enable");
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cmd.arg("mode");
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cmd.arg(&output_config.mode);
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cmd.arg("scale");
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cmd.arg(&output_config.scale);
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cmd.arg("pos");
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cmd.arg(&output_config.x.to_string());
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cmd.arg(&output_config.y.to_string());
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cmd.arg("transform");
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cmd.arg(&output_config.transform);
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cmd.arg(",");
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});
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disabled.iter().for_each(|output_name| {
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cmd.arg("output");
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cmd.arg(&output_name);
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cmd.arg("disable");
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cmd.arg(",");
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});
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// print what we are about to do.
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cmd.get_args()
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.for_each(|arg| print!("{} ", arg.to_str().unwrap()));
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cmd.output().expect("swaymsg output failed");
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}
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