The gui program will attempt to parse the datapack in datapack/, if it exists, and will export a valid datapack to datapack/ which you can rename or place the contents of into a zip file for a datapack Minecraft can load
Grist types from Minestuck do not need the minestuck: prefix, but grist types from addons do need to be prefixed with the id their respective mod
grist_json accepts comma separated values (csv) from a file or through standard input in the format of
modid:itemname,build=20,ruby=4
It will generate a data directory with all the grist cost json files to put in a datapack