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DARKMAN(1) General Commands Manual DARKMAN(1) NAME darkman -- control dark-mode and light-mode transitions SYNOPSIS darkman [options] command DESCRIPTION darkman runs in the background and turns on dark mode at sundown, and turns it off again at sunrise. darkman is not designed to be used interactively: it's designed to be set up once, and run in the background. It is also possible to trigger manual transitions and it is also possible to disable automatic transitions entirely. COMMANDS run [--ready-fd fd] Runs the darkman service. This command is intended to be executed by a service manager, init script or alike. The optional fd is a file descriptor where darkman will notify when it is ready to receive connections from clients. The protocol used is compatible with readiness notifications for s6, dinit and sys- temd. set <light | dark> Sets the current mode. get Prints the current mode. toggle Toggle the current mode. OPTIONS --verbose Print detailed logs. Defaults to true for the run command and to false for all other commands. CONFIGURATION See darkman.conf(5) for configuration file format and "FILES" for configu- ration file locations. INTEGRATIONS The open source desktop ecosystem is quite heterogeneous and making differ- ent applications switch between dark/light requires different mechanisms. darkman seeks to implement the more widely adopted standards, while leaving room for users to hook in custom scripts for other applications. Custom executables darkman can run custom executables (which can be simple shell scripts). Scripts are searched in a directory named darkman inside paths defined in the XDG_DATA_DIRS as well as XDG_DATA_HOME. Each script receives the cur- rent mode ("dark or "light"") as its first argument ($1). This allows a single script to handle both modes: #!/bin/sh case "$1" in dark) THEME=dark-theme ;; light) THEME=light-theme ;; esac gsettings set org.example.app theme "$THEME" For backwards compatibility, darkman also searches dark-mode.d and light-mode.d directories (legacy format). Scripts in these directories run without arguments. Scripts in the darkman directory with the same name will override legacy scripts. Both of these variables and their fallbacks are defined in the XDG Base Di- rectory Specification: https://specifications.freedesktop.org/basedir-spec/latest/ These scripts or executables can perform any actions required like re-write configuration files for a PDF reader, control a notification daemon to switch to another theme, or toggle a DE-specific setting. Files must have the executable bit set in order to be considered an exe- cutable. Scripts must have the proper shebang for the OS to properly exe- cute them. Typically, the XDG_DATA_* variables mentioned above will resolve to the following set of directories: * ~/.local/share/ * /usr/local/share/ * /usr/share/ Example scripts (and discussion on how to integrate different applications) are available in the project repository: https://gitlab.com/WhyNotHugo/darkman Packages may also drop-in their own scripts into any of these locations, although application developers are encouraged to use the socket API to de- termine the current mode and listen for changes (see below for details). XDG Settings portal darkman implements the XDG desktop portal's dark mode interface. Applica- tions using this API should switch to dark/light mode based on darkman's current preference. This interface was originally pushed by the GNOME and Elementary teams, and is currently supported by KDE, Firefox and many other projects. You should expect applications from those environments to sup- port it, amongst others. For more details on this protocol, see: https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.Settings.html As of xdg-desktop-portal(1) version 1.17.0, portals MUST be configured with per-user configuration portals.conf(5). To force the usage of darkman for dark/light mode setting, use something like the following: [preferred] org.freedesktop.impl.portal.Settings=darkman When using a desktop-specific configuration (e.g.: swaywm-portals.conf), please keep in mind that the environment variable XDG_CURRENT_DESKTOP must be set for the xdg-desktop-portal(1). The xdg-desktop-portal(1) should start after darkman has started and is ready. Use --ready-fd for readiness notification. This is likely not rel- evant on systemd-based setups, where the service manager intermediates in taking the named bus. For a more in-depth explanation, see this article: https://whynothugo.nl/journal/2024/04/09/darkman-portal-configuration/ Socket API darkman listens on a Unix socket for query and control commands. The socket exposes a simple text-based API where commands are followed by a newline, and darkman writes a response also followed by a newline. The get, set and toggle commands use this API. It is also the recommended approach when writing custom tools (e.g.: switching the current mode based on the input from a light sensor). The following commands are available: get Print the current mode. set mode Set the current mode. mode must be one of light or dark. toggle Switch to the opposite mode. The new mode is printed as a re- sponse. watch Print mode changes as they occur. The current mode is printed im- mediately, followed by each subsequent change. To interact with the socket manually: socat UNIX-CONNECT:${XDG_RUNTIME_DIR}/darkman/control.sock STDIO A libdarkman Go package is available to query this interface from other client applications. See its documentation for details: https://godocs.io/gitlab.com/WhyNotHugo/darkman/libdarkman Third party integrations For Emacs users, a third party package exists to integrate darkman with Emacs: https://github.com/grtcdr/darkman.el There also exists a plugin for neovim users: https://github.com/4e554c4c/darkman.nvim LOCATION The current location may be specified in the configuration file. The loca- tion is used to calculate what time sundown and sunrise happen. It is also possible for darkman to automatically determine the system's lo- cation using geoclue(1). Geoclue's reliability varies depending on distri- bution and desktop environment, as an agent often needs to be configured for it to work properly. If no location is known, automatic transitions are disabled. ENVIRONMENT The following environment variables are also read and will override the configuration file: DARKMAN_LAT Overrides the latitude for the current location. DARKMAN_LNG Overrides the longitude for the current location. XDG_CURRENT_DESKTOP darkman does not use this variable; it should be defined for the xdg-desktop-portal(1) instead. FILES darkman searches for a configuration file in the following locations, using the first one found: 1. $XDG_CONFIG_HOME/darkman/config.yaml 2. Each directory in XDG_CONFIG_DIRS, with darkman/config.yaml appended. If XDG_CONFIG_HOME is not set, it defaults to ~/.config. If XDG_CONFIG_DIRS is not set, it defaults to /etc/xdg. See darkman.conf(5) for configuration file format. PRIVACY darkman will trigger a darkmode/lightmode transition at sundown in the cur- rent location. Any application that is running locally can record or transmit the time of these transitions and attempt to extrapolate informa- tion related to the current location. When a web browser applies this transition at the same time, open websites can record this information too. A potential stalker or tracker can use the above information to infer that you are likely in a region of the world where sunset happened at a specific time. This region is usually a wide area spanning tens of thousands of kilometers, but can be smaller for certain geographical locations. The author of this tool uses a manually configured location with an integer latitude and longitude to achieve a sensible balance between privacy and convenience. DEVELOPMENT For issues and general development inquiries, see the project home cur- rently hosted at GitLab: https://gitlab.com/WhyNotHugo/darkman DEBUGGING To confirm which value is relayed via the xdg-desktop-portal(1) use: gdbus call --session \ --dest org.freedesktop.portal.Desktop \ --object-path /org/freedesktop/portal/desktop \ --method org.freedesktop.portal.Settings.ReadOne \ org.freedesktop.appearance color-scheme SEE ALSO portals.conf(5), gammastep(1), sd-ready-fd(1) AUTHORS Developed by Hugo O. Barrera <hugo@whynothugo.nl>, with invaluable contri- butions from the community. darkman is an open source project licensed under the ISC licence and devel- oped for anyone to use freely. If you would like to sponsor this project, see: https://whynothugo.nl/sponsor FreeBSD ports 15.quarterly 2025-12-25 DARKMAN(1)
NAME | SYNOPSIS | DESCRIPTION | COMMANDS | OPTIONS | CONFIGURATION | INTEGRATIONS | LOCATION | ENVIRONMENT | FILES | PRIVACY | DEVELOPMENT | DEBUGGING | SEE ALSO | AUTHORS
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