Add Steam Controller Battery

[The-GothamKnight]

Steam Controller Battery

Displays the battery status of a connected Steam Controller directly in the Steam desktop title bar, including battery percentage and charging state.

Automatically appears in the title bar when the controller is connected and hides when it is disconnected.

The plugin uses Steam's ControllerStore to detect and monitor the controller and integrates the indicator directly into Steam's native title-bar controls.

An optional integration with Xenon is also available through scriptStates, allowing the same Steam Controller battery information to be displayed in compatible Xenon widgets.

Repository: https://github.com/The-GothamKnight/steam-controller-battery

Task Checklist

Developer

• My plugin complies with the plugin submission guidelines
• I am the original author or an authorized maintainer of this plugin.
• I have complied with all license requirements for the libraries used, including providing appropriate notices where necessary.
• My plugin is fully open source and does not depend on any external paid services, except for widely trusted and well-known platforms. Additionally, neither I nor anyone associated with me profits from any such services.
• Generative AI was used for most of the plugin's code.

Plugin Functionality

• I have tested the plugin on both the Stable and Beta Steam update channels.
• My plugin is unique, or provides additional or alternative functionality to plugins already on the store.

Backend Configuration

• I use a standard Millennium Lua backend in my plugin.
• I use custom binaries that or rely on other FOSS projects that aren't written directly using Millennium's Lua backend.

Community Contribution

• I have tested and left feedback on two other plugin pull requests.
• I have added links to those feedback comments in this PR.

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Testing Instructions

• Verified by a third party on Steam Client Stable.
• Verified by a third party on Steam Client Beta.