Swayr & Swayrbar

Table of Contents

• Swayr
  • Commands
  • Screenshots
  • Installation
  • Usage
  • Configuration
  • Version changes
• Swayrbar
  • Screenshots
  • Installation
  • Configuration
  • Version changes
• Questions and patches
• Bugs
• Build status
• License

sway

Note on terminology: When starting this project, I somehow confused the terms most-recently-used (MRU) and least-recently-used (LRU). I've meant the former but called it last-recently-used whose meaning is the same as most-recently-used but whose abbreviation LRU is actually the opposite. So now there are many commands with lru in their name: it always means most-recently-used (MRU), not least-recently-used (LRU). It's too late to rename the commands. Maybe I'll add aliases at some point and deprecate the old names...

Swayr consists of a daemon, and a client. The swayrd daemon records window/workspace creations, deletions, and focus changes using sway's JSON IPC interface. The swayr client offers subcommands, see swayr --help, and sends them to the daemon which executes them.

The swayr binary provides many subcommands of different categories.

Those are commands which switch through a sequence of windows where the sequence is:

1. All windows with urgency hints.
2. All matching windows where which windows match is specific to the command.
3. The most recently used window at the time of the sequence start.
4. Back to the origin window, i.e., the window which had the focus at the time of the sequence start.

During each sequence no window will be visited twice, e.g., if some window has an urgency hint, matches the commands specification, and is also the LRU window, it's not visited once in each step 1, 2, and 3 but just in step 1.

The steps 1, 3, and 4 can be inhibited with the flags --skip-urgent, --skip-lru, and --skip-origin, respectively.

As said, which windows match is specific to each command:

• switch-to-urgent-or-lru-window matches nothing, so step 2 above is effectively disabled.
• switch-to-app-or-urgent-or-lru-window <name> matches windows with the specified name. The name is compared literally against the window's app_id for native Wayland windows or to the window class or instance for X11 windows. The command immediately exits non-zero if there is no matching window at all.
• switch-to-mark-or-urgent-or-lru-window <con_mark> matches the window having the given mark. As man sway(5) defines, each mark can only be applied to a single window at a time. The command immediately exits non-zero if there is no matching window at all.
• switch-to-matching-or-urgent-or-lru-window <criteria> matches windows according to the the given criteria query. The command immediately exits non-zero if there is no matching window at all.

All above commands also have a flag --skip-lru-if-current-doesnt-match which is like --skip-lru but skips the LRU window only if the currently focused window is no matching window (by app name, mark, or criteria). Note that switch-to-urgent-or-lru-window has this flag for purely technical reasons but it has no effect there.

The switch-to-app-or-urgent-or-lru-window can be conveniently used to define switch-to-or-start commands for your favorite applications, e.g., I have those:

bindsym $mod+e exec \
        swayr switch-to-app-or-urgent-or-lru-window \
              --skip-lru-if-current-doesnt-match emacs \
        || emacs
bindsym $mod+b exec \
        swayr switch-to-app-or-urgent-or-lru-window \
              --skip-lru-if-current-doesnt-match firefoxdeveloperedition \
        || firefox-developer-edition

Menu switchers

Those spawn a menu program where you can select a window (or workspace, or output, etc.) and act on that.

• switch-window displays all windows in the order of urgent windows first, then windows in most-recently-used order, and the currently focused window last. The window selected in the menu program will be focused.
• steal-window displays all windows in the order or switch-window and moves the chosen window into the current workspace.
• steal-window-or-container displays all windows and containers moves the window or container into the current workspace.
• switch-workspace displays all workspaces in MRU order and switches to the selected one.
• switch-output shows all outputs in the menu and focuses the selected one.
• switch-workspace-or-window displays all workspaces and their windows and switches to the selected workspace or window.
• switch-workspace-container-or-window shows workspaces, containers, and their windows in the menu program and switches to the selected one.
• switch-to shows outputs, workspaces, containers, and their windows in the menu program and switches to the selected one.
• quit-window displays all windows and quits the selected one. An optional --kill / -k flag may be specified in which case the window's process will be killed using kill -9 <pid> rather than only sending a kill IPC message to sway.
• quit-workspace-or-window displays all workspaces and their windows and allows to quit either the selected workspace (all its windows) or the selected window.
• quit-workspace-container-or-window shows workspaces, containers, and their windows and quits all windows of the selected workspace/container or the selected window.
• move-focused-to-workspace moves the currently focused window or container to another workspace selected with the menu program. Non-matching input of the form #w:<workspace> where the hash and w: shortcut are optional can be used to move it to a new workspace.
• move-focused-to moves the currently focused container or window to the selected output, workspace, container, window. Non-matching input is handled like with move-focused-to-workspace.
• swap-focused-with swaps the currently focused window or container with the one selected from the menu program.

Menu shortcuts for non-matching input

All menu switching commands (switch-window, switch-workspace, and switch-workspace-or-window) now handle non-matching input instead of doing nothing. The input should start with any number of # (in order to be able to force a non-match), a shortcut followed by a colon, and some string as required by the shortcut. The following shortcuts are supported.

• w:<workspace>: Switches to a possibly non-existing workspace. <workspace> must be a digit, a name or <digit>:<name>. The <digit>:<name> format is explained in man 5 sway. If that format is given, swayr will create the workspace using workspace number <digit>:<name>. If just a digit or name is given, the number argument is not used.
• s:<cmd>: Executes the sway command <cmd> using swaymsg.
• Any other input is assumed to be a workspace name and thus handled as w:<input> would do.

Those commands cycle through (a subset of windows) in most-recently-used order.

• next-window (all-workspaces|current-workspace) & prev-window (all-workspaces|current-workspace) focus the next/previous window in depth-first iteration order of the tree. The argument all-workspaces or current-workspace define if all windows of all workspaces or only those of the current workspace are considered.
• next-tiled-window & prev-tiled-window do the same as next-window & prev-window but switch only between windows contained in a tiled container.
• next-tabbed-or-stacked-window & prev-tabbed-or-stacked-window do the same as next-window & prev-window but switch only between windows contained in a tabbed or stacked container.
• next-floating-window & prev-floating-window do the same as next-window & prev-window but switch only between floating windows.
• next-window-of-same-layout & prev-window-of-same-layout is like next-floating-window / prev-floating-window if the current window is floating, it is like next-tabbed-or-stacked-window / prev-tabbed-or-stacked-window if the current window is in a tabbed or stacked container, it is like next-tiled-window / prev-tiled-window if the current windows is in a tiled container, and is like next-window / prev-window otherwise.
• next-matching-window / prev-matching-window both take a criteria query.

Layout modification commands

These commands change the layout of the current workspace.

• tile-workspace exclude-floating|include-floating tiles all windows on the current workspace (excluding or including floating ones). That's done by moving all windows away to some special workspace, setting the current workspace to splith layout, and then moving the windows back. If the auto_tile feature is used, see the Configuration section below, it'll change from splitting horizontally to vertically during re-insertion.
• shuffle-tile-workspace exclude-floating|include-floating shuffles & tiles all windows on the current workspace. The shuffle part means that (a) the windows are shuffled before re-insertion, and (b) a randomly chosen already re-inserted window is focused before re-inserting another window. So while tile-workspace on a typical horizontally oriented screen and 5 windows will usually result in a layout with one window on the left and all four others tiled vertially on the right, shuffle-tile-workspace in combination with auto_tile usually results in a more balanced layout, i.e., 2 windows tiled vertically on the right and the other 4 tiled vertially on the left. If you have less than a handful of windows, just repeat shuffle-tile-workspace a few times until happenstance creates the layout you wanted.
• tab-workspace exclude-floating|include-floating puts all windows of the current workspace into a tabbed container.
• toggle-tab-shuffle-tile-workspace exclude-floating|include-floating toggles between a tabbed and tiled layout, i.e., it calls shuffle-tile-workspace if it is currently tabbed, and calls shuffle-tile-workspace if it is currently tiled.

Scripting commands

• get-windows-as-json returns a JSON containing all windows, possibly with scratchpad windows if --include-scratchpad is given. Furthermore, --matching <CRITERIA> can be used to restrict the windows to those matching the given criteria query (see the criteria section). Lastly, if --error-if-no-match is given and no windows exist or match the given criteria query, the command exits non-zero instead of printing a JSON array. This makes it suitable for shell scripting. Essentially, swayr get-windows-as-json --matching <CRITERIA> --error-if-no-match is like swaymsg <CRITERIA> nop except that it returns the windows as JSON and support's swayr's extended criteria queries instead of the simple ones supported by sway.
• for-each-window <CRITERIA> <SHELL_COMMAND> executes <SHELL_COMMAND> for each window matched by <CRITERIA> (see the criteria section). In <SHELL_COMMAND> almost all placeholders defined in the section about window formats are replaced. For example, swayr for-each-window true echo "The app {app_name} has the PID {pid}." tells the application name and the pid for each window. The result of the command is a JSON array with objects containing the exit code, stdout, stderr, and a (system) error field. If any command returns non-zero, so will for-each-window. The shell commands will be executed in parallel they must finish within 2 seconds, otherwise they'll be killed. Otherwise, the command execution would block swayrd for as long as the slowest thread requires, e.g., sleep 10 would block for slightly over 10 seconds.

Miscellaneous commands

• configure-outputs lets you repeatedly issue output configuration commands until you abort the menu program.
• execute-swaymsg-command displays most swaymsg which don't require additional input and executes the selected one. That's handy especially for less often used commands not bound to a key. Non-matching input will be executed executed as-is with swaymsg. Also note that custom commands can be defined in the configuration file's [swaymsg_commands] section.
• execute-swayr-command displays all commands above and executes the selected one. (This is useful for accessing swayr commands which are not bound to a key.)
• nop (unsurprisingly) does nothing, the command can be used to break out of a sequence of non-menu switching commands or window cycling commands. The LRU window order is frozen when the first cycling command is processed and remains so until a non-cycling command is received. The nop command can conveniently serve to interrupt a sequence without having any other side effects.

Swayr supports most of the criteria querys defined by Sway, see section CRITERIA in man sway(5). Right now, these are:

• app_id=<regex | __focused__>
• class=<regex | __focused__>
• instance=<regex | __focused__>
• title=<regex | __focused__>
• workspace=<regex | __focused__>
• con_mark=<regex>
• con_id=<uint | __focused__>
• shell=<"xdg_shell" | "xwayland" | __focused__>
• pid=<uint>
• floating
• tiling
• app_name=<regex | __focused__> (not in sway!)

The last criterion app_name is matched against the application's name which can either be app_id, window_properties.class, or window_properties.instance (whatever is filled).

All regular expressions are Rust's regex crates regexes. With the special value __focused__, comparison is performed literally.

In addition to the simple criteria listed above, criteria queries can be combined using and, or, and not with the syntax:

• [and <crit1> <crit2> ...] which is equivalent to [<crit1> <crit2> ...], i.e., the and is optional for compatibility with sway which only supports this syntax and has no or and not. [and] and [] always match.
• [or <crit1> <crit2> ...] where [or] never matches.
• not <crit> where the following criterion is negated.

The combinators may also be written in all-caps, i.e., AND, OR, and NOT, or as &&, ||, and !.

Obviously, criteria may be nested, so this is a valid one:

[|| [app_id="firefox" tiling]
    [&& !app_id="firefox" floating workspace=__focused__]]

There are also the boolean literals true and false available which may also be written in all-caps.

Some distros have packaged swayr so that you can install it using your distro's package manager. Alternatively, it's easy to build and install it yourself using cargo.

Distro packages

The following GNU/Linux and BSD distros package swayr. Thanks a lot to the respective package maintainers! Refer to the repology site for details.

Building with cargo

You'll need to install the current stable rust toolchain using the one-liner shown at the official rust installation page.

Then you can install swayr like so:

cargo install swayr

For getting updates easily, I recommend the cargo cargo-update plugin.

# Install it once.
cargo install cargo-update

# Then you can update all installed rust binary crates including swayr using:
cargo install-update --all

# If you only want to update swayr, you can do so using:
cargo install-update -- swayr

You need to start the swayr daemon (swayrd) in your sway config (~/.config/sway/config) like so:

exec env RUST_BACKTRACE=1 RUST_LOG=swayr=debug swayrd > /tmp/swayrd.log 2>&1

The setting of RUST_BACKTRACE=1, RUST_LOG=swayr=debug and the redirection of the output to some logfile is optional but helps a lot when something doesn't work. Especially, if you encounter a crash in certain situations and you want to report a bug, it would be utmost helpful if you could reproduce the issue with backtrace and logging at the debug level and attach that to your bug report. Valid log levels in the order from logging more to logging less are: trace, debug, info, warn, error, off.

Beyond starting the daemon, you will want to bind swayr commands to some keys like so:

bindsym $mod+Space       exec swayr switch-window
bindsym $mod+Delete      exec swayr quit-window
bindsym $mod+Tab         exec swayr switch-to-urgent-or-lru-window
bindsym $mod+Next        exec swayr next-window all-workspaces
bindsym $mod+Prior       exec swayr prev-window all-workspaces
bindsym $mod+Shift+Space exec swayr switch-workspace-or-window
bindsym $mod+c           exec swayr execute-swaymsg-command
bindsym $mod+Shift+c     exec swayr execute-swayr-command

Of course, configure the keys to your liking.

Pending a fix for Sway issue #6456 or a merge of Sway PR #6920, it will be possible to close a sequence of non-menu switching commands or window cycling commands using a nop command bound to the release of the $mod key. Assuming your $mod is bound to Super_L it could look something like this:

bindsym --release Super_L exec swayr nop

Until then, there's the focus.auto_nop_delay option which see below in the Configuration section.

Swayr can be configured using the ~/.config/swayr/config.toml or /etc/xdg/swayr/config.toml config file.

If no config files exists, a simple default configuration will be created on the first invocation for use with the wofi menu program.

It should be easy to adapt that default config for usage with other menu programs such as fuzzel, dmenu, bemenu, rofi, a script spawning a terminal with fzf, or whatever. The only requirement is that the launcher needs to be able to read the items to choose from from stdin and spit out the selected item to stdout.

The default config looks like this:

[menu]
executable = 'wofi'
args = [
    '--show=dmenu',
    '--allow-markup',
    '--allow-images',
    '--insensitive',
    '--cache-file=/dev/null',
    '--parse-search',
    '--height=40%',
    '--prompt={prompt}',
]

[format]
output_format = '{indent}<b>Output {name}</b>    <span alpha=\"20000\">({id})</span>'
workspace_format = '{indent}<b>Workspace {name} [{layout}]</b>    <span alpha="20000">({id})</span>'
container_format = '{indent}<b>Container [{layout}]</b> on workspace {workspace_name} <i>{marks}</i>    <span alpha="20000">({id})</span>'
window_format = 'img:{app_icon}:text:{indent}<i>{app_name}</i> — {urgency_start}<b>“{title}”</b>{urgency_end} on workspace {workspace_name} <i>{marks}</i>    <span alpha="20000">({id})</span>'
indent = '    '
urgency_start = '<span background="darkred" foreground="yellow">'
urgency_end = '</span>'
html_escape = true
icon_dirs = [
    '/usr/share/icons/hicolor/scalable/apps',
    '/usr/share/icons/hicolor/64x64/apps',
    '/usr/share/icons/hicolor/48x48/apps',
    '/usr/share/icons/Adwaita/64x64/apps',
    '/usr/share/icons/Adwaita/48x48/apps',
    '/usr/share/pixmaps',
]

[layout]
auto_tile = false
auto_tile_min_window_width_per_output_width = [
    [1024, 500],
    [1280, 600],
    [1400, 680],
    [1440, 700],
    [1600, 780],
    [1920, 920],
    [2560, 1000],
    [3440, 1000],
    [4096, 1200],
]

[focus]
lockin_delay = 750

[misc]
auto_nop_delay = 3000
seq_inhibit = false

[swaymsg_commands]
include_predefined = true
[swaymsg_commands.commands]
"Window to workspace XXX" = "move window to workspace XXX"
"Workspace to left output" = "move workspace to output left"
"Workspace to right output" = "move workspace to output right"

In the following, all sections are explained.

The menu section

In the [menu] section, you can specify the menu program using the executable name or full path and the args (flags and options) it should get passed. If some argument contains the placeholder {prompt}, it is replaced with a prompt such as "Switch to window" depending on context.

In the [format] section, format strings are specified defining how selection choices are to be layed out. wofi supports pango markup which makes it possible to style the text using HTML and CSS. The following formats are supported right now.

• output_format defines how outputs (monitors) are displayed in the menu program, workspace_format defines how workspaces are displayed, container_format defines how non-workspace containers are displayed, and window_format defines how application windows are displayed.
• In these formats, the following placeholders can be used:
  • {name} gets replaced by the output name, the workspace number or name or a window's title. The placeholder {title} is an obsolete synonym which will be removed in a later version.
  • {layout} shows the workspace or container's layout.
  • {id} gets replaced by the sway-internal con id.
  • {pid} gets replaced by the PID.
  • {indent} gets replaced with N times the new format.indent value where N is the depth in the shown menu input.
  • {app_name} gets replaced with a window's application name.
  • {marks} shows a comma-separated list of the container's or window's marks.
  • {app_icon} shows the application's icon (a path to a PNG or SVG file).
  • {workspace_name} gets replaced with the name or number of the workspace the container or window belongs to.
  • The placeholders {urgency_start} and {urgency_end} get replaced by the empty string if the window has no urgency flag and with the values of the same-named formats if the window has the urgency flag set. That makes it possible to highlight urgent windows as shown in the default config.
• indent is a string which is repeatedly inserted at the {indent} placeholder in formats.
• html_escape defines if the strings replacing the placeholders above (except for {urgency_start} and {urgency_end}) should be HTML-escaped.
• urgency_start is a string which replaces the {urgency_start} placeholder in window_format.
• urgency_end is a string which replaces the {urgency_end} placeholder in window_format.
• icon_dirs is a vector of directories in which to look for application icons in order to compute the {app_icon} replacement.
• fallback_icon is a path to some PNG/SVG icon which will be used as {app_icon} if no application-specific icon can be determined.

All the except {app_icon}, {indent}, {urgency_start}, and {urgency_end} may optionally provide a format string as specified by Rust's std::fmt. The syntax is {<placeholder>:<fmt_str><clipped_str>}. For example, {app_name:{:>10.10}} would mean that the application name is printed with exactly 10 characters. If it's shorter, it will be right-aligned (the >) and padded with spaces, if it's longer, it'll be cut after the 10th character. Another example, {app_name:{:.10}...} would mean that the application name is truncated at 10 characters. If it's shorter, it will be printed as-is (no padding), if it's longer, it'll be cut after the 10th character and the last 3 characters of that substring will be replaced with ... (<clipped_str>).

It is crucial that during selection (using wofi or some other menu program) each window has a different display string. Therefore, it is highly recommended to include the {id} placeholder at least in container_format and window_format. Otherwise, e.g., two vertical splits on the same workspace or two terminals (of the same terminal app) with the same working directory (and therefore, the same title) wouldn't be distinguishable.

Hint for wofi: wofi supports icons with the syntax 'img:<image-file>:text:<text>', so a suitable window_format with application icon should start with img:{app_icon}:text:.

Hint for rofi: rofi supports icons with the syntax "<text>\u0000icon\u001f<image-file>", so a suitable window_format with application icon should end with "\u0000icon\u001f{app_icon}". Also note that you must enclose your window_format value with double-quotes and not with single-quotes. Singe-quote strings are literal strings in TOML where no escape-sequences are processed whereas for double-quoted strings (so-called basic strings) escape-sequences are processed. rofi requires a null character and a PARAGRAPH SEPARATOR for image sequences.

Hint for fuzzel: I've been told that fuzzel supports the very same icon syntax as discussed for rofi above.

The layout section

In the [layout] section, you can enable auto-tiling by setting auto_tile to true (the default is false). The option auto_tile_min_window_width_per_output_width defines the minimum width in pixels which your windows should have per output width. For example, the example setting above says that on an output which is 1600 pixels wide, each window should have at least a width of 780 pixels, thus there may be at most two side-by-side windows (Caution, include your borders and gaps in your calculation!). There will be no auto-tiling doesn't include your output's exact width.

If auto_tile is enabled, swayr will automatically split either vertically or horizontally according to this algorithm:

• For all outputs:
  • For all (nested) containers on that output (except the scratchpad):
    • For all child windows of that container:
      • If the container is split horizontally and creating another window would make the current child window smaller than the minimum width, execute split vertical (the swaymsg command over IPC) on the child.
      • Else if the container is split vertically and now there is enough space so that creating another window would still leave the current child window above or equal to the minimum width, call split horizontal on the child.
      • Otherwise, do nothing for this container. This means that stacked or tabbed containers will never be affected by auto-tiling.

There is one caveat: it would be nice to also trigger auto-tiling when windows or containers are resized but unfortunately, resizing doesn't issue any events over IPC. Therefore, auto-tiling is triggered by new-window events, close-events, move-events, floating-events, and also focus-events. The latter are a workaround and wouldn't be required if there were resize-events.

The focus section

In the [focus] section, you can configure the amount of time a window has to keep the focus in order to affect the LRU order, the lockin_delay (specified in milliseconds). If a given window is only briefly focused, e.g., by moving the mouse over it on the way to another window with sway's focus_follows_mouse set to yes or always, then its position in the LRU order will not be modified.

The misc section

In the [misc] section, there's the auto_nop_delay option. When some swayr command is executed, this amount of milliseconds is waited before a nop command (see the commands documentation) is executed in order to break out of a next-*-window/prev-*-window sequence or a switch-to-*or-urgent-or-lru-window cycle automatically. If another swayr command is executed within this time frame, the auto-nop execution will be delayed for another auto_nop_delay milliseconds. If this option is not specified explicitly, no automatic nop commands will be executed.

A more elegant solution using a key release binding is discussed at the end of the Usage section. However, that requires a PR to sway which has not been merged so far.

The seq_inhibit boolean controls how swayrd behaves during a sequence of window cycling commands.

• When the setting is true, swayrd will inhibit updates to the window LRU order while a sequence of window cycling commands is in progress. LRU updates are reactivated when the sequence ends. A sequence is considered to have ended when any non-window-cycling-command is received by swayrd (e.g. a nop command).

  Note: LRU update inhibition also applies to focus changes made outside of swayr, for instance by using sway commands directly.

• When the setting is false (the default), swayrd will handle focus events the same way regardless of whether a window cycling sequence is in progress or not.

Note that the key release binding solution lends itself to using seq_inhibit=true.

The swaymsg_commands section

This section configures the execute-swaymsg-command command.

• The option include_predefined defines if the default swaymsg commands, which swayr provided for a long time, should be included.
• The commands hashmap defines your custom commands as label = command pairs. Since it's a map, the labels (keys) need to be unique.

Since version 0.8.0, I've started writing a NEWS file listing the news, and changes to swayr commands or configuration options. If something doesn't seem to work as expected after an update, please consult this file to check if there has been some (possibly incompatible) change requiring an update of your config.

swayrbar is a status command for sway's swaybar implementing the swaybar-protocol(7). This means, you would setup your swaybar like so in your ~/.config/sway/config:

bar {
    swaybar_command swaybar
    # Use swayrbar as status command with some logging output which
    # is redirected to /tmp/swayrbar.log.  Be sure to only redirect
    # stderr because the swaybar protocol requires the status_command
    # to emit JSON to stdout which swaybar reads.
    status_command env RUST_BACKTRACE=1 RUST_LOG=swayr=debug swayrbar 2> /tmp/swayrbar.log
    position top
    font pango:Iosevka 11
    height 20

    colors {
        statusline #f8c500
        background #33333390
    }
}

swayrbar, like waybar, consists of a set of modules which you can enable and configure via its config file, either the one specified via the command line option --config-file, the user-specific (~/.config/swayrbar/config.toml), or the system-wide (/etc/xdg/swayrbar/config.toml). Modules emit information which swaybar then displays and mouse clicks on a module's space in swaybar are propagated back and trigger some action (e.g., a shell command).

Right now, there are the following modules:

1. The window module can show the title and application name of the current window in sway.
2. The sysinfo module can show things like CPU/memory utilization or system load.
3. The battery module can show the current state of charge, the state (e.g., charging), and the state of health.
4. The date module can show, you guess it, the current date and time!
5. The pactl module can show the current volume percentage and muted state. Clicks can increase/decrease the volume or toggle the mute state.
6. The nmcli module uses NetworkManager's nmcli command line tool to show the currently connected wifi and its signal strength.
7. The iwctl module the iwctl command line tool to show the currently connected wifi and its signal strength.

I guess there will be more modules in the future as time permits. Patches are certainly very welcome!

Some distros have a swayrbar package so that you can install it using your distro's package manager, see the repology site for details. Alternatively, it's easy to build and install it yourself using cargo.

Installation via Cargo

You'll need to install the current stable rust toolchain using the one-liner shown at the official rust installation page.

Then you can install swayrbar like so:

cargo install swayrbar

For getting updates easily, I recommend the cargo install-update plugin.

# Install it once.
cargo install install-update

# Then you can update all installed rust binary crates including swayr using:
cargo install-update --all

# If you only want to update swayr, you can do so using:
cargo install-update -- swayrbar

When swayrbar is run for the very first time and doesn't find an existing configuration file at ~/.config/swayrbar/config.toml (user-specific) or /etc/xdg/swayrbar/config.toml (system-wide), it'll create a new user-specific one where all modules are enabled and set up with some reasonable (according to the author) default values. Adapt it to your needs.

The syntax of the config file is TOML. Here's a short example with all top-level options (one!) and one module.

refresh_interval = 1000

[[modules]]
name = 'window'
instance = '0'
format = '🪟 {title} — {app_name}'
html_escape = false

[modules.on_click]
Left = ['swayr', 'switch-to-urgent-or-lru-window']
Right = ['kill', '{pid}']

The refresh_interval defines the number of milliseconds between refreshes of swaybar.

The remainder of the configuration defines a list of modules with their configuration (which is an array of tables in TOML where a module's on_click).

• name is the name or type of the module, e.g., window, sysinfo, battery, date,...
• instance is an arbitrary string used for distinguishing two modules of the same name. For example, you might want to have two sysinfo modules, one for CPU and one for memory utilization, simply to have a separator between these different kinds of information. That's easily doable, just give them different instance values.
• format is the string to be printed in swaybar where certain placeholders are substituted with module-specific values. Usually, such placeholders are written like {title}, i.e., inside braces. Like in swayr, formatting (padding, aligning, precision, etc.) is available, see here.
• html_escape defines if <, >, and & should be escaped as <, >, and & because format may contain pango markup. Obviously, if you make use of this feature, you want to set html_escape = true for that module. This option is optional and may be omitted.
• on_click is a table defining actions to be performed when you click on a module's space in swaybar. All placeholders available in format are available here, too. The action for each mouse button is specified as an array ['command', 'arg1', 'arg2',...]. The available button names to be assigned to are Left, Middle, Right, WheelUp, WheelDown, WheelLeft, and WheelRight.

The on_click table can also be written as inline table

on_click = { Left = ['swayr', 'switch-to-urgent-or-lru-window'], Right = ['kill', '{pid}'] }

but then it has to be on one single line.

The window module

The window module supports the following placeholders:

• {title} or {name} expand to the currently focused window's title.
• {app_name} is the application name.
• {pid} is the process id.

Note that the window module also reacts to title change events of windows which are not current and that's a feature! For examle, consider your Emacs on workspace 1 is focused. Now you click a link in there which causes your Firefox on (the invisible) workspace 2 to open a new tab. This will cause swayrbar to display the Firefox title so you can see that your click had an effect. After at most 3 seconds, the title of the focused application will be displayed again.

By default, it has the following click bindings:

• Left executes swayr switch-to-urgent-or-lru-window.
• Right kills the process of the window.

The sysinfo module

The sysinfo module supports the following placeholders:

• {cpu_usage} is the percentage of CPU utilization.
• {mem_usage} is the percentage of memory utilization.
• {load_avg_1} is the average system load in the last minute.
• {load_avg_5} is the average system load in the last five minutes.
• {load_avg_15} is the average system load in the last fifteen minutes.

By default, it has the following click bindings:

• Left executes foot htop.

The battery module

The battery module supports the following placeholders:

• {state_of_charge} is the percentage of charge wrt. the battery's current capacity.
• {state_of_health} is the percentage of the battery's remaining capacity compared to its original capacity.
• {state} is the current state, e.g., something like Discharging or Full.

The pactl module

The pactl module requires the pulse-audio command line tool of the same name to be installed. It supports the following placeholders:

• {volume} is the current volume percentage of the default sink.
• {muted} is the string " muted" if the default sink is currently muted, otherwise it is the empty string.

By default, it has the following click bindings:

• Left calls the pavucontrol program (PulseAudio GUI control).
• Right toggles the default sink's mute state.
• WheelUp and WheelDown increase/decrease the volume of the default sink.

The nmcli module

The nmcli module requires NetworkManager and the nmcli command line tool. It can display information about the wifi connection. It supports the following placeholders:

• {name} wifi network name.
• {signal} wireless signal strength (in %).
• {bars} a visualization of connection strength, like "▂▄▆_".

The iwctl module

The iwctl module requires the iwctl command line tool which comes with iwd. It can display information about the wifi connection. It supports the following placeholders:

• {name} wifi network name.
• {signal} wireless signal strength (in dBm).
• {bars} a visualization of connection strength, like "▂▄▆_".

The date module

The date module shows the date and time by defining the format using chrono's strftime format.

Version changes are summarized in the NEWS file. If something doesn't seem to work as expected after an update, please consult this file to check if there has been some (possibly incompatible) change requiring an update of your config.

For asking questions, sending feedback, or patches, refer to my public inbox (mailinglist). Please mention the project you are referring to in the subject, e.g., swayr or swayrbar (or other projects in different repositories).

It compiles, therefore there are no bugs. Oh well, if you still found one or want to request a feature, you can do so here.

Swayr & Swayrbar are licensed under the GPLv3 (or later).