Add recipes for generate-json

Makefile

@@ -61,3 +61,30 @@ $(KY)/%.cabal:
 
 $(RW)/%.cabal:
 	dhall-hpack-cabal --package-dhall=$(@:.cabal=.dhall)
+
+.PHONY: generate-json
+generate-json: \
+  $(KY)/empty-inferred/package.json \
+  $(KY)/empty-package.json \
+  $(KY)/with-GHC2021.json \
+  $(KY)/when-dependencies.json \
+  $(KY)/import-relative/package.json \
+  $(KY)/import-local/package.json \
+  $(KY)/empty-inferred/package.json \
+  $(RW)/stack/stack.json \
+  $(RW)/hpack/hpack.json
+
+$(KY)/empty-package.json:
+	dhall-hpack-json --package-dhall=$(@:.json=.dhall) > $@
+
+$(KY)/when-dependencies.json:
+	dhall-hpack-json --package-dhall=$(@:.json=.dhall) > $@
+
+$(KY)/with-GHC2021.json:
+	dhall-hpack-json --package-dhall=$(@:.json=.dhall) > $@
+
+$(KY)/%/package.json:
+	cd $(@D) && dhall-hpack-json > $(@F)
+
+$(RW)/%.json:
+	dhall-hpack-json --package-dhall=$(@:.json=.dhall) > $@