komorebi

Tiling Window Management for Windows.

komorebi is a tiling window manager that works as an extension to Microsoft's Desktop Window Manager in Windows 10 and above.

komorebi allows you to control application windows, virtual workspaces and display monitors with a CLI which can be used with third-party software such as whkd and AutoHotKey to set user-defined keyboard shortcuts.

komorebi aims to make as few modifications as possible to the operating system and desktop environment by default. Users are free to make such modifications in their own configuration files for komorebi, but these will remain opt-in and off-by-default for the foreseeable future.

Please refer to the documentation for instructions on how to install and configure komorebi, common workflows, a complete configuration schema reference and a complete CLI reference.

There is a Discord server available for komorebi-related discussion, help, troubleshooting etc. If you have any specific feature requests or bugs to report, please create an issue in this repository.

There is a YouTube channel where I post komorebi development videos. If you would like to be notified of upcoming videos please subscribe and turn on notifications.

komorebi is a free and open-source project, and one that encourages you to make charitable donations if you find the software to be useful and have the financial means.

I encourage you to make a charitable donation to the Palestine Children's Relief Fund before you consider sponsoring me on GitHub.

GitHub Sponsors is enabled for this project. Unfortunately I don't have anything specific to offer besides my gratitude and shout outs at the end of komorebi live development videos and tutorials.

If you would like to tip or sponsor the project but are unable to use GitHub Sponsors, you may also sponsor through Ko-fi.

Installation

A detailed installation and quickstart guide is available which shows how to get started using scoop, winget or building from source.

Demonstrations

@haxibami showing komorebi running on Windows 11 with a terminal emulator, a web browser and a code editor. The original video can be viewed here.

https://user-images.githubusercontent.com/13164844/163496447-20c3ff0a-c5d8-40d1-9cc8-156c4cebf12e.mp4

@aik2mlj showing komorebi running on Windows 11 with multiple workspaces, terminal emulators, a web browser, and the yasb status bar with the komorebi workspace widget enabled. The original video can be viewed here.

https://user-images.githubusercontent.com/13164844/163496414-a9cde3d1-b8a7-4a7a-96fb-a8985380bc70.mp4

Contribution Guidelines

If you would like to contribute to komorebi please take the time to carefully read the guidelines below.

Commit hygiene

• Flatten all use statements
• Run cargo +stable clippy and ensure that all lints and suggestions have been addressed before committing
• Run cargo +nightly fmt --all to ensure consistent formatting before committing
• Use git cz with the Commitizen CLI to prepare commit messages
• Provide at least one short sentence or paragraph in your commit message body to describe your thought process for the changes being committed

PRs should contain only a single feature or bug fix

It is very difficult to review pull requests which touch multiple unrelated features and parts of the codebase.

Please do not submit pull requests like this; you will be asked to separate them into smaller PRs that deal only with one feature or bug fix at a time.

If you are working on multiple features and bug fixes, I suggest that you cut a branch called local-trunk from master which you keep up to date, and rebase the various independent branches you are working on onto that branch if you want to test them together or create a build with everything integrated.

Refactors to the codebase must have prior approval

komorebi is a mature codebase with an internal consistency and structure that has developed organically over close to half a decade.

There are countless hours of live coding videos demonstrating work on this project and showing new contributors how to do everything from basic tasks like implementing new komorebic commands to distinguishing monitors by manufacturer hardware identifiers and video card ports.

Refactors to the structure of the codebase are not taken lightly and require prior discussion and approval.

Please do not start refactoring the codebase with the expectation of having your changes integrated until you receive an explicit approval or a request to do so.

Similarly, when implementing features and bug fixes, please stick to the structure of the codebase as much as possible and do not take this as an opportunity to do some "refactoring along the way".

It is extremely difficult to review PRs for features and bug fixes if they are lost in sweeping changes to the structure of the codebase.

Breaking changes to user-facing interfaces are unacceptable

This includes but is not limited to:

• All komorebic commands
• The komorebi.json schema
• The komorebi-application-specific-configuration schema

No user should ever find that their configuration file has stopped working after upgrading to a new version of komorebi.

More often than not there are ways to reformulate changes that may initially seem like they require breaking user-facing interfaces into additive changes.

For some inspiration please take a look at this commit which added the ability for users to specify colours in komorebi.json in Hex format alongside RGB.

There is also a process in place for graceful, non-breaking, deprecation of configuration options that are no longer required.

License

komorebi is licensed under the PolyForm Strict 1.0.0 license. On a high level this means that you are free to do whatever you want with komorebi other than redistribution, or distribution of new works (ie. hard-forks) based on the software.

Anyone is free to make their own fork of komorebi with changes intended either for personal use or for integration back upstream via pull requests.

Please see CONTRIBUTING.md for more information about how code contributions to komorebi are licensed.

Development

If you use IntelliJ, you should enable the following settings to ensure that code generated by macros is recognised by the IDE for completions and navigation:

• Set Expand declarative macros to Use new engine under "Settings > Langauges & Frameworks > Rust"
• Enable the following experimental features:
  • org.rust.cargo.evaluate.build.scripts
  • org.rust.macros.proc

Logs and Debugging

Logs from komorebi will be appended to %LOCALAPPDATA%/komorebi/komorebi.log; this file is never rotated or overwritten, so it will keep growing until it is deleted by the user.

Whenever running the komorebic stop command or sending a Ctrl-C signal to komorebi directly, the komorebi process ensures that all hidden windows are restored before termination.

If however, you ever end up with windows that are hidden and cannot be restored, a list of window handles known to komorebi are stored and continuously updated in %LOCALAPPDATA%/komorebi//komorebi.hwnd.json.

Restoring Windows

Running komorebic restore-windows will read the list of window handles and forcibly restore them, regardless of whether the main komorebi process is running.

Panics and Deadlocks

If komorebi ever stops responding, it is most likely either due to either a panic or a deadlock. In the case of a panic, this will be reported in the log. In the case of a deadlock, there will not be any errors in the log, but the process and the log will appear frozen.

If you believe you have encountered a deadlock, you can compile komorebi with --features deadlock_detection and try reproducing the deadlock again. This will check for deadlocks every 5 seconds in the background, and if a deadlock is found, information about it will appear in the log which can be shared when opening an issue.

Window Manager State and Integrations

The current state of the window manager can be queried using the komorebic state command, which returns a JSON representation of the State struct.

This may also be polled to build further integrations and widgets on top of.

Window Manager Event Subscriptions

Named Pipes

It is possible to subscribe to notifications of every WindowManagerEvent and SocketMessage handled by komorebi using Named Pipes.

First, your application must create a named pipe. Once the named pipe has been created, run the following command:

komorebic.exe subscribe-pipe <your pipe name>

Note that you do not have to include the full path of the named pipe, just the name.

If the named pipe exists, komorebi will start pushing JSON data of successfully handled events and messages:

{"event":{"type":"AddSubscriber","content":"yasb"},"state":{}}
{"event":{"type":"FocusWindow","content":"Left"},"state":{}}
{"event":{"type":"FocusChange","content":["SystemForeground",{"hwnd":131444,"title":"komorebi – README.md","exe":"idea64.exe","class":"SunAwtFrame","rect":{"left":13,"top":60,"right":1520,"bottom":1655}}]},"state":{}}
{"event":{"type":"MonitorPoll","content":["ObjectCreate",{"hwnd":5572450,"title":"OLEChannelWnd","exe":"explorer.exe","class":"OleMainThreadWndClass","rect":{"left":0,"top":0,"right":0,"bottom":0}}]},"state":{}}
{"event":{"type":"FocusWindow","content":"Right"},"state":{}}
{"event":{"type":"FocusChange","content":["SystemForeground",{"hwnd":132968,"title":"Windows PowerShell","exe":"WindowsTerminal.exe","class":"CASCADIA_HOSTING_WINDOW_CLASS","rect":{"left":1539,"top":60,"right":1520,"bottom":821}}]},"state":{}}
{"event":{"type":"FocusWindow","content":"Down"},"state":{}}
{"event":{"type":"FocusChange","content":["SystemForeground",{"hwnd":329264,"title":"den — Mozilla Firefox","exe":"firefox.exe","class":"MozillaWindowClass","rect":{"left":1539,"top":894,"right":1520,"bottom":821}}]},"state":{}}
{"event":{"type":"FocusWindow","content":"Up"},"state":{}}
{"event":{"type":"FocusChange","content":["SystemForeground",{"hwnd":132968,"title":"Windows PowerShell","exe":"WindowsTerminal.exe","class":"CASCADIA_HOSTING_WINDOW_CLASS","rect":{"left":1539,"top":60,"right":1520,"bottom":821}}]},"state":{}}

You may then filter on the type key to listen to the events that you are interested in. For a full list of possible notification types, refer to the enum variants of WindowManagerEvent in komorebi and SocketMessage in komorebi-core.

Below is an example of how you can subscribe to and filter on events using a named pipe in nodejs.

const { exec } = require("child_process");
const net = require("net");

const pipeName = "\\\\.\\pipe\\komorebi-js";
const server = net.createServer((stream) => {
  console.log("Client connected");

  // Every time there is a workspace-related event, let's log the names of all
  // workspaces on the currently focused monitor, and then log the name of the
  // currently focused workspace on that monitor

  stream.on("data", (data) => {
    let json = JSON.parse(data.toString());
    let event = json.event;

    if (event.type.includes("Workspace")) {
      let monitors = json.state.monitors;
      let current_monitor = monitors.elements[monitors.focused];
      let workspaces = monitors.elements[monitors.focused].workspaces;
      let current_workspace = workspaces.elements[workspaces.focused];

      console.log(
        workspaces.elements
          .map((workspace) => workspace.name)
          .filter((name) => name !== null)
      );
      console.log(current_workspace.name);
    }
  });

  stream.on("end", () => {
    console.log("Client disconnected");
  });
});

server.listen(pipeName, () => {
  console.log("Named pipe server listening");
});

const command = "komorebic subscribe-pipe komorebi-js";

exec(command, (error, stdout, stderr) => {
  if (error) {
    console.error(`Error executing command: ${error}`);
    return;
  }
});

Unix Domain Sockets

It is possible to subscribe to notifications of every WindowManagerEvent and SocketMessage handled by komorebi using Unix Domain Sockets.

UDS are also the only mode of communication between komorebi and komorebic.

First, your application must create a socket in $ENV:LocalAppData\komorebi. Once the socket has been created, run the following command:

komorebic.exe subscribe-socket <your socket name>

If the socket exists, komorebi will start pushing JSON data of successfully handled events and messages as in the example above in the Named Pipes section.

Rust Client

As of v0.1.22 it is possible to use the komorebi-client crate to subscribe to notifications of every WindowManagerEvent and SocketMessage handled by komorebi in a Rust codebase.

Below is a simple example of how to use komorebi-client in a basic Rust application.

// komorebi-client = { git = "https://github.com/LGUG2Z/komorebi", tag = "v0.1.25"}

use anyhow::Result;
use komorebi_client::Notification;
use komorebi_client::NotificationEvent;
use komorebi_client::UnixListener;
use komorebi_client::WindowManagerEvent;
use std::io::BufRead;
use std::io::BufReader;
use std::io::Read;

pub fn main() -> anyhow::Result<()> {
  let socket = komorebi_client::subscribe(NAME)?;

  for incoming in socket.incoming() {
    match incoming {
      Ok(data) => {
        let reader = BufReader::new(data.try_clone()?);

        for line in reader.lines().flatten() {
          let notification: Notification = match serde_json::from_str(&line) {
            Ok(notification) => notification,
            Err(error) => {
              log::debug!("discarding malformed komorebi notification: {error}");
              continue;
            }
          };

          // match and filter on desired notifications
        }
      }
      Err(error) => {
        log::debug!("{error}");
      }
    }
  }

}

A read-world example can be found in komokana.

Subscription Event Notification Schema

A JSON Schema of the event notifications emitted to subscribers can be generated with the komorebic notification-schema command. The output of this command can be redirected to the clipboard or a file, which can be used with services such as Quicktype to generate type definitions in different programming languages.

Communication over TCP

A TCP listener can optionally be exposed on a port of your choosing with the --tcp-port=N flag. If this flag is not provided to komorebi or komorebic start, no TCP listener will be created.

Once created, your client may send any SocketMessage to komorebi in the same way that komorebic would.

This can be used if you would like to create your own alternative to komorebic which incorporates scripting and various middleware layers, and similarly it can be used if you would like to integrate komorebi with a custom input handler.

If a client sends an unrecognized message, it will be disconnected and have to reconnect before trying to communicate again.

Socket Message Schema

A JSON Schema of socket messages used to send instructions to komorebi can be generated with the komorebic socket-schema command. The output of this command can be redirected to the clipboard or a file, which can be used with services such as Quicktype to generate type definitions in different programming languages.

Appreciations

• First and foremost, thank you to my wife, both for naming this project and for her patience throughout its never-ending development

• Thank you to @sitiom for being an exemplary open source community leader

• Thank you to the developers of nog who came before me and whose work taught me more than I can ever hope to repay

• Thank you to the developers of GlazeWM for pushing the boundaries of tiling window management on Windows with me and having an excellent spirit of collaboration

• Thank you to @Ciantic for helping me bring the hidden Virtual Desktops cloaking function to komorebi