shutter 0.1.1

Renders a Flutter project's widget previews to PNG, reusing the ones it already has, and diffs two runs pixel by pixel into before and after images of a change.

Changelog

0.1.1

Documentation and package metadata; the tool behaves as in 0.1.0.

• The package description, the README, and shutter --help open on what shutter produces, a change to a widget expressed as before and after images, instead of on the agent that drives it.
• The ai topic is replaced by cli: shutter is a command-line tool an agent can drive, not an AI package.
• README lists when to reach for shutter: a change going up for review, a refactor that should change nothing on screen, a widget that might break on screen, a dependency just added or upgraded.
• shutter agent says what shot --widget answers, a look at a widget before the call site exists, names the commands that upload an image to a pull or merge request, and states that --import reaches only what the project's pubspec.yaml resolves.
• Flutter's previewer is called by its name, the Flutter Widget Previewer.

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.