The FSHingTrip.js script provides a simple wrapper that takes as input a set of FHIR StructureDefinitions. Those SDs are converted to FSH using goFSH, and then converted back to FHIR SDs using SUSHI. The resulting "round-trip" output is compared to the original input to generate a differential that shows how well goFSH and SUSHI have replicated the original input.
To use this tool, first, ensure that you have goFSH and SUSHI globally installed with npm. Then, clone this repo:
git clone https://github.com/ngfreiter/FSHing-trip.git
and run npm install to install required dependencies:
cd FSHing-trip
npm install
Then you can run the wrapper script by doing:
node FSHingTrip.js <path-to-defs>
where <path-to-defs> is a path to a folder containing JSON FHIR StructureDefinitions, and a config.yaml file. The config.yaml file is necessary for running SUSHI, and is described in detail by the SUSHI documentation. Any required dependencies should be listed in the config.yaml file.
The output will by default be written to a build folder within the current working directory. Alternatively, an output folder can optionally be specified:
node FSHingTrip.js <path-to-defs> <optional-path-to-output>
Within the output folder will be a goFSH folder, containing the output of goFSH, a sushi folder, containing the output of sushi, and a diff folder, containing HTML files which show the difference between ElementDefinitions on the original input and the round-trip output. Note that the differential generation only works for StructureDefinitions.