KeyHint

Utility to display keyboard shortcuts or other hints based on the active window on Linux.

Prerequisites

• Python 3.11+
• GTK 4.6+ (shipped since Ubuntu 22.04) + related dev packages:

  sudo apt-get install \
     libgirepository1.0-dev \
     libcairo2-dev \
     python3-gi \
     gobject-introspection \
     libgtk-4-dev

• Wayland & Gnome: The Gnome Extension "Window-Calls" is required to auto-select the cheatsheet based on the current active application.

Installation

• uv tool install keyhint (recommended, requires uv)
• pipx install keyhint (requires pipx)
• or pip install keyhint

Usage

• Configure a global hotkey (e.g. Ctrl + F1) via your system settings to launch keyhint.
• If KeyHint is launched via hotkey, it detects the current active application and shows the appropriate hints. (This feature won't work reliably when KeyHint ist started via Menu or Launcher.)

CLI Options

Application Options:
  -c, --cheatsheet=SHEET-ID                 Show cheatsheet with this ID on startup
  -v, --verbose                             Verbose log output for debugging

Cheatsheet Configuration

The content which KeyHint displays is configured using toml configuration files.

KeyHint reads those files from two locations:

1. The built-in directory
2. The user directory, usually located in ~/.config/keyhint

How Keyhint selects the cheatsheet to show

• The cheatsheet to be displayed on startup are selected by comparing the value of regex_wmclass with the wm_class of the active window and the value of regex_title with the title of the active window.
• The potential cheatsheets are processed alphabetically by filename, the first file that matches both wm_class and title are getting displayed.
• Both of regex_ values are interpreted as case in-sensitive regular expressions.
• Check "Debug Info" in the application menu to get insights about the active window and the selected cheatsheet file.

Customize or add cheatsheets

• To change built-in cheatsheets, copy the corresponding .toml-file into the config directory. Make your changes in a text editor. As long as you don't change the id it will overwrite the defaults.
• To create new cheatsheets, I suggest you start with one of the existing .toml-file:
  • Place it in the config directory and give it a good file name.
  • Change the value id to something unique.
  • Adjust regex_wmclass and regex_title so it will be selected based on the active window. (See Tips)
  • Add the shortcuts & label to a section.
  • If you think your cheatsheet might be useful for others, please consider opening a pull request or an issue!
• You can always reset cheatsheets to the shipped version by deleting the corresponding .toml files from the config folder.
• You can include shortcuts from other cheatsheets by adding include = ["<Cheatsheet ID>"]

Examples

Hide existing cheatsheets

To hide a cheatsheet, e.g. the built-in one with the ID tilix, create a new file ~/.config/keyhint/tilix.toml with the content:

id = "tilix"
hidden = true

Extend existing cheatsheets

To add keybindings to an existing cheatsheet, e.g. the built-in one with the ID firefox, create a new file ~/.config/keyhint/firefox.toml which only contains the ID and the additional bindings:

id = "firefox"

[section]
[section."My Personal Favorites"]  # New section
"Ctrl + Shift + Tab" = "Show all Tabs"
# ...

Add new cheatsheet which never gets auto-selected

To add a new cheatsheet, which never gets automatically selected and displayed by KeyHint, but remains accessible through KeyHint's cheatsheet dropdown, create a file ~/.config/keyhint/my-app.toml:

id = "my-app"
url = "url-to-my-apps-keybindings"

[match]
regex_wmclass = "a^"  # Patter which never matches
regex_title = "a^"

[section]
[section.General]
"Ctrl + C" = "Copy"
# ...

Different cheatsheets for different Websites

For showing different browser-cheatsheets depending on the current website, you might want to use a browser extension like "Add URL To Window Title" and configure the [match] section to look for the url in the title. E.g. ~/.config/keyhint/github.toml

id = "github.com"

[match]
regex_wmclass = "Firefox"
regex_title = ".*github\\.com.*"  # URL added by browser extensions to window title

[section]
[section.Repositories]
gc = "Goto code tab"
# ...

Contribute

I'm happy about any contribution! Especially I would appreciate submissions to improve the shipped cheatsheets. (The current set are the cheatsheets I personally use).

Design Principles

• Don't run as service
  It shouldn't consume resources in the background, even if this leads to slightly slower start-up time.
• No network connection
  Everything should run locally without any network communication.
• Dependencies
  The fewer dependencies, the better.

Certification