code-scan starred SketchyBar

This is a rewrite of the spacebar project, which itself is a rewrite of the statusbar code from yabai.

Features:

As many widgets as you like at any of the three positions: left, center, right
The order of the widgets in the sketchybarrc file will be the order in which they show in the bar
Associate widgets to certain displays or spaces, to show specific information on the relevant screens/displays
The widgets are highly customizable with settings for different fonts, colors, icon paddings, label paddings, etc. for each individual element
Draw arbitrary graphs in the bar with external data provider scripts that push the data into the graph
Overlay as many graphs as wanted, like system cpu usage and user cpu usage in one figure
Individual refresh frequencies for each widget
Let items subscribe to system events (e.g. space changed, etc.) for their refresh action
Create custom events and trigger them externaly
"click" events for the widgets, where a script can be specified to run on a mouse click
Cache the scripts in RAM to reduce I/O operations
Offset the bar from its original location, rounded corners and background blur
Batch configuration messages for easy configuration
Performance friendly

SketchyBar

Description

This bar project aims to create a highly flexible, customizable and fast statusbar for users that like playing around with shell scripts and want to make their statusbar show exactly the information they need for their workflow.

The configuration of the bar takes place in a confiuration file where almost everything can be configured. Bascially, the bar itself is a rectangle that can hold arbitrarily many items and components, which can be configured to do awesome stuff. An item will occupy a space in the bar and can be equipped to show an icon and a label. The icon and label can be changed through scripts that can be attached to the item. It is also possible to subscribe and item to certain events for their script execution action, which makes very powerful items possible. Additionally, an item can be assigned a click_script, which executes on a mouse click. Furthermore, an item can be assigned to mission control spaces or displays, such that they only show on a certain space or display, which makes multi-desktop configuration of the bar possible and opens the possibility to create individualized bar configuration on a per display and per space level. These simple ingredients make items almost endlessly customizable and can be used to display arbitrary information and perform useful actions. For some examples see my sketchybarrc and the plugins folder.

Some special features can not be accomplished with a simple item, this is where the components come into play. They basically are items with extra steps. They contain all the properties a regular item does, but they can do specialized tasks a simple item can not. For example, there is a graph component, which can be used to display graphs in the bar.

For more details on how the configuration works, see the Configuration section below.

This is my setup: where I have my screens and a vim mode indicator on the left. Not shown is the high memory warning which shows the process that is using high system memory on demand. In the center I have a spotify indicator (only when music is playing) and on the right I have (not shown) a high cpu process indicator, as well as a cpu graph, a github contribution counter, a new mail counter and the current date.

The cpu and memory indicators are only shown on the "code" screen and are not visible on the other screens.

Installation

Stable Version

brew tap FelixKratz/formulae
brew install sketchybar

Do not forget to copy the example configuration files to your home directory:

mkdir ~/.config/sketchybar
cp /usr/local/opt/sketchybar/share/sketchybar/examples/sketchybarrc ~/.config/sketchybar/sketchybarrc
mkdir ~/.config/sketchybar/plugins
cp -r /usr/local/opt/sketchybar/share/sketchybar/examples/plugins/ ~/.config/sketchybar/plugins
chmod +x ~/.config/sketchybar/plugins/*

and run the bar via

brew services start sketchybar

Development Version

Clone the repo and in it run

This installs the app with my configuration preinstalled.

You can customize the configuration inside of $HOME/.config/sketchybar/sketchybarrc and run the bar via

Switching branches and uninstalling

You can always switch branches by removing the current installation and reinstalling the selected branch To uninstall the development version perform

in the cloned repo.

To uninstall the brew version simply run

brew uninstall sketchybar

Plugins and Fonts

If you want to use your own plugins, make sure that they are referenced in the rc with the correct path and that they are made executable via

chmod +x name/of/plugin.sh

Have a look at the discussion about plugins and share your own if you want to. You should of course vet the code from all plugins before granting them the executable bit to make sure they are not harming your computer.

If you have problems with missing fonts you might need to install the Hack Nerd Font:

brew tap homebrew/cask-fonts
brew install --cask font-hack-nerd-font

Updating

Since this is a work-in-progress project, there might be big and radical changes along the way. You can update by pulling from master and in the up to date repo folder run:

or simply update via brew. This will not touch your configuration and the plugins, so if there is a radical change to the source code you might need to update those files too.

Configuration

Below is a list of all possible commands you can currently use in the configuration file located in ~/.config/sketchybar/sketchybarrc:

Note on batching configuration commands

It is possible to batch commands together into a single call to sketchybar, this can be helpful to keep the configuration file a bit cleaner and also to reduce startup times. There always is a standalone version of a command and a batch version of the same command, with the difference being, that all batch commands can be joined into a single call, for example:

sketchybar -m config position top
sketchybar -m add item demo left
sketchybar -m set demo label Hello
sketchybar -m subscribe demo system_woke

turns into:

sketchybar -m batch --config position=top        \
                    --add item demo left         \
                    --set demo label=Hello       \
                    --subscribe demo system_woke

Global configuration of the bar

sketchybar -m config <setting> <value>

or when you want to batch configurations:

sketchybar -m batch --config <setting>=<value> ... <setting>=<value>

where the settings currently are:

position: top or bottom
height: the height of the bar in pixels
margin: the screen padding around the bar itself
y_offset: the y-offset in pixels from the default position
corner_radius: the corner radius of the bar itself
border_width: the width of the bars border
border_color: the color of the bars border
blur_radius: the blur radius to be applied to the background of the bar itself
padding_left: padding on the left before first item
padding_right: just as padding_right
bar_color: the color of the bar itself
display: on which display to show bar (main or all)
hidden: hides and unhides the bar, for hotkey toggling of the bar (on, off, toggle)
topmost: draws sketchybar on top of everything (even the default menu bar) (on, off, toggle)

Adding a simple menubar item (items will appear in the bar in the order they are added)

sketchybar -m add item <name> <position>

with batching possible via:

sketchybar -m batch --add item <name> <position>

where the name should not contain whitespaces, it can be used to further configure the item, which is covered later. The position is the placement in the bar and can be either left, right or center.

Adding a component

sketchybar -m add component <type> <name> <position>

or for batching of commands:

sketchybar -m batch --add component <type> <name> <position>

Components are essentially items, but with special properties. Currently there are the component types:

title: Showing the current window title, (DEPRECATED, see this)
graph: showing a graph,
space: representing a mission control space

Changing the properties of an item

sketchybar -m set <name> <property> <value>

here batching is also possible with:

sketchybar -m batch --set <name> <property>=<value> ... <property>=<value>

where the name is used to target the item with this name.

A list of properties is listed below:

associated_space: on which space to show this item (can be multiple, not specifying anything will show item on all screens)
associated_display: on which displays to show this item (can be multiple, not specifying anything will show item on all displays)
label: the label of the item
label_font: the font for the label
label_color: the color of the label
label_highlight_color: the highlight color of the label (e.g. for active space icon)
label_padding_left: left padding of label (default: 0)
label_padding_right: right padding of label (default: 0)
icon_highlight: wether the icon is highlighted with the icon_highlight_color (values: on, off, toggle, default: off)
icon: the icon of the item
icon_font: the font for the icon
icon_color: the color of the icon
icon_highlight_color: the highlight color of the icon (e.g. for active space icon)
icon_padding_left: left padding of icon (default: 0)
icon_padding_right: right padding of icon (default: 0)
label_highlight: wether the label is highlighted with the label_highlight_color (values: on, off, toggle, default: off)
draws_background: wether the item should draw a background (values: on, off, toggle, default: off)
background_color: draws a rectangular background for this item in the given color (this automatically activates draws_background)
background_border_color: the color of the backgrounds border
background_corner_radius: the corner radius of the items background (default: 0)
background_border_width: the border width of the items background (default: 0)
graph_color: color of the associated graph
script: a script to run every update_freq seconds
update_freq: time in seconds between script executions
click_script: script to run when left clicking on item
cache_scripts: If the scripts should be cached in RAM or read from disc every time (values: on, off, toggle, default: off)
scripting: If scripts should be executed (values: on, off, toggle, default: on)
drawing: If the item should be drawn into the bar (values: on, off, toggle, default: on)
lazy: Changes do not trigger a redraw of the bar, item is refreshed when the bar is redrawn anyways (values: on, off, toggle, default: off)

Changing the default values for all further items

sketchybar -m default <property> <value>

batching is again possible via:

sketchybar -m batch --default <property>=<value> ... <property>=<value>

this currently works for the properties:

label_font
label_color
label_highlight_color
label_padding_left
label_padding_right
icon_font
icon_color
icon_highlight_color
icon_padding_left
icon_padding_right
draws_background
background_color
background_border_color
background_corner_radius
background_border_width
update_freq
cache_scripts
scripting
drawing

It is also possible to reset the defaults via the command

sketchybar -m default reset

Subscribing items to system events for their script execution

sketchybar -m subscribe <name> <event> ... <event>

the batching command is very similar:

sketchybar -m batch --subscribe <name> <event> ... <event>

where the events are:

front_app_switched: when frontmost application changes (not triggered if a different app of the same window is focused)
space_change: when the space is changed
display_change: when the display is changed
system_woke: when the system has awaken from sleep

Creating custom events

This allows to define events which are triggered by a different application (see Trigger custom events). Items can also subscribe to these events for their script execution.

sketchybar -m add event <name> [optional: <NSDistributedNotificationName>]

and the batch version of this:

sketchybar -m batch --add event <name> [optional: <NSDistributedNotificationName>]

Optional: You can hook the notifications sent to the NSDistributedNotificationCenter e.g. the notification Spotify sends on track change: "com.spotify.client.PlaybackStateChanged" to create more responsive items

Triggering custom events

This triggers a custom event that has been added before

sketchybar -m trigger <event>

This could be used to link the powerful event system of yabai to sketchybar by triggering the custom action via a yabai event.

Supplying data for graphs

sketchybar -m push <name> <data>

This pushes the data point into the graph with name name.

Forcing all shell scripts to run and the bar to refresh

Completely remove an item

sketchybar -m remove item <name>

This also works for components, just reference it by name.

Freeze and unfreeze the bar

sketchybar -m freeze <on/off>

This stops the redrawing of the bar entirely and "freezes" it. Can be used during initialization to create a cleaner startup by freezing the bar at the beginning of the configuration and unfreezing it after the setup is done.

Scripting

The bar supports scripts where ever possible to make it as customizable and versatile as possible. When an item invokes a script, the script has access to some environment variables, such as:

Which is the name of the item that has invoked the script. The space component has additional variables:

where $SELETCTED has the value true if the associated space is selected and false if the selected space is not selected, while $SID holds the space id and $DID the display id.

By default the space component invokes the script:

if [ "$SELECTED" = "true" ]; then 
  sketchybar -m set $NAME icon_highlight on 
else 
  sketchybar -m set $NAME icon_highlight off 
fi

which you can freely configure to your liking by supplying a different script to the space component. For performance reasons the space script is only run on change. I plan on increasing the available environment variables in scripting step by step but if you have a suggestion let me know in the issues.

Credits

yabai, spacebar, reddit, many more for the great code base and inspiration