The current toolset for authoring and editing FC4 diagrams is:
|Any text editor||
fc4-tool was created because when one uses Structurizr Express (SE) to position the elements of a diagram, SE regenerates the diagram source YAML in such a way that the YAML becomes noisy and the sorting can change. This makes the source harder to work with in a text editor and impossible to usefully diff from revision to revision — and without useful diffing it’s very difficult to do effective peer review.
So fc4-tool processes the YAML: cleans it up, applies a stable sort to all properties, removes empty properties, etc — so as to ensure that the changes applied in each revision are very small and specific and all extraneous changes are filtered out. This will hopefully enable effective peer review of revisions to the diagrams.
The functionality of fc4-tool will expand over time to include additional features to assist with authoring and maintaining FC4 diagrams.