Add script to run code generation for modules containing test types (a…

…wakesecurity#16)

* Squash merge from branch `joel-add-compile-proto-file-tool`

* Squash merge from branch `joel-prefer-codegen-over-derive-generic`

* Add proto3-suite-no-tests attr to toplevel

* Add `tests/generate-test-types.sh

* PR feedback from @gabriel re: nix-env invocations and a configure switch in README.md

README.md

@@ -32,7 +32,7 @@ and test environment. From the root of this repository:
 
 ```bash
 $ nix-shell release.nix -A proto3-suite.env
-[nix-shell]$ cabal configure --with-gcc=clang --enable-tests
+[nix-shell]$ cabal configure --enable-tests
 [nix-shell]$ cabal build
 [nix-shell]$ cabal test
 ```
@@ -43,11 +43,11 @@ Run the following commmand from the root of this repository to install the
 `compile-proto-file` executable:
 
 ```bash
-$ nix-env -iA proto3-suite -f release.nix
+$ nix-env --install --attr proto3-suite -f release.nix
 ```
 
 To remove it from your nix user profile path, use:
 
 ```bash
-$ nix-env -e proto3-suite
+$ nix-env --uninstall proto3-suite
 ```

release.nix

@@ -72,7 +72,8 @@ let
         pkgs = import nixpkgs { inherit config; };
 
 in
-  { proto3-suite-linux  =  linuxPkgs.haskellPackages.proto3-suite;
-    proto3-suite-darwin = darwinPkgs.haskellPackages.proto3-suite;
-    proto3-suite        =       pkgs.haskellPackages.proto3-suite;
+  { proto3-suite-linux    =     linuxPkgs.haskellPackages.proto3-suite;
+    proto3-suite-darwin   =    darwinPkgs.haskellPackages.proto3-suite;
+    proto3-suite          =          pkgs.haskellPackages.proto3-suite;
+    proto3-suite-no-tests = pkgs.haskellPackages.proto3-suite-no-tests;
   }

tests/GeneratedImportedTestTypes.hs

@@ -94,4 +94,4 @@ instance HsProtobuf.Message WithNesting_Nested where
                 (HsProtobuf.Prim HsProtobuf.Int32)
                 (HsProtobuf.Single "nestedField2")
                 []
-                Hs.Nothing)]
+                Hs.Nothing)]

tests/GeneratedTestTypes.hs

@@ -1099,4 +1099,4 @@ instance HsProtobuf.Message Wrapped where
                 (HsProtobuf.Prim (HsProtobuf.Named (HsProtobuf.Single "Wrapped")))
                 (HsProtobuf.Single "wrapped")
                 []
-                Hs.Nothing)]
+                Hs.Nothing)]

tests/README.md

@@ -0,0 +1,14 @@
+# Code generation for tests
+
+Running:
+
+```bash
+$ bash generate-test-types.sh
+```
+
+from inside this directly will result in `GeneratedTestTypes.hs` and
+`GeneratedImportedTestTypes.hs` being regenerated from
+`../test-files/test.proto` and `../test-files/test_import.proto`, respectively.
+
+We'll eventually `nix`-ify the building of codegen artifacts, so this is a bit
+of a stopgap.

tests/generate-test-types.sh

@@ -0,0 +1,3 @@
+PROTO3_SUITE_NO_TESTS=$(nix-build --no-out-link ../release.nix -A proto3-suite-no-tests)
+(cd .. && "${PROTO3_SUITE_NO_TESTS}"/bin/compile-proto-file --proto test-files/test.proto > tests/GeneratedTestTypes.hs)
+(cd .. && "${PROTO3_SUITE_NO_TESTS}"/bin/compile-proto-file --proto test-files/test_import.proto > tests/GeneratedImportedTestTypes.hs)