shutter 0.1.0

Renders any Flutter widget to PNG, from a command-line expression or the project's `@Preview` functions, and diffs two runs pixel-wise. A small CLI shaped for AI agents.

Changelog

0.1.0

Initial release: a CLI, shaped for AI agents, that renders Flutter widgets to PNG and compares two runs.

• shutter shot renders the @Preview functions of the named files, or one --widget expression, to PNG through flutter test. The target project gains no dependency.
• shutter diff compares two runs by shot id as changed, added, removed, or unchanged; --images marks the differing pixels.
• shutter init writes the shell that wraps every shot, and shutter doctor checks the setup.
• shutter agent and shutter manual print the playbook and the reference; the shutter-visual-check skill points agents at them.
• Requires Flutter 3.47+ (Dart 3.13+) in the target project.

Experimental (specification not settled):

• The default shell generated for the design library the project uses.
• A preview's theme, through Flutter's unstable PreviewThemeData interface.
• google_fonts, downloaded once into .dart_tool/shutter/fonts/google_fonts/ and served as bundled assets.