Fix google#185: Support and use autogen-modules.

This makes it possible to generate tarballs without generated modules
(which would be regenerated anyway when the package is build).
See tensorflow/haskell#180 for an example of the issues that causes.

Unfortunately, this required us stopping using `hpack` in our packages
that generate proto files.  `hpack`, when you use the `autogen-modules`
field,
`cabal-version: >= 2.0` when the file

I mitigated the situation a little by changing the Cabal test script to
only try to `sdist` packages that we're planning to release.

.travis.yml

@@ -36,7 +36,7 @@ before_install:
       cabal)
         export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.local/bin:$HOME/.cabal/bin:$PATH;;
     esac
-  - curl -L https://github.com/commercialhaskell/stack/releases/download/v1.6.1/stack-1.6.1-linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C $HOME/.local/bin '*/stack'
+  - curl -L https://github.com/commercialhaskell/stack/releases/download/v1.7.1/stack-1.7.1-linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C $HOME/.local/bin '*/stack'
   - curl -L https://github.com/google/protobuf/releases/download/v3.0.0-beta-2/protoc-3.0.0-beta-2-linux-x86_64.zip > protoc-release.zip
   - unzip -p protoc-release.zip protoc > $HOME/.local/bin/protoc
   - chmod a+x $HOME/.local/bin/protoc

docs/releasing.md

@@ -17,26 +17,8 @@ since they are intended only for use within this repository:
 - Make sure you are on a commit that has been merged upstream to `google/proto-lens`.
 
 ## Steps
-1. For each package *without* autogenerated proto modules, simply run (from the root of the repo):
+First, run `stack build` at the top level.  Then, for each package that you want to upload, run
 
         stack upload {name-of-package}
 
-  Then verify that they've been uploaded successfully by visiting `hackage.org` in a web browser.
-
-2. For packages *with* autogenerated proto-modules (currently:
-`proto-lens-protobuf-types` and `proto-lens-combinators`): these are a little
-harder to upload due to #185.  We have a script for running `sdist`:
-
-        ./release.sh
-
-  Then, for each package that should be uploaded:
-
-        cabal upload {package}/dist/{path}.tar.gz
-
-3. Finally, tag each uploaded package with its version and push it back to upstream.  For example:
-
-        git tag -a proto-lens-v0.3.0.0 -m "Release proto-lens v0.3.0.0"
-        ...
-        git remote add upstream [email protected]:google/proto-lens.git
-        git push upstream --follow-tags  # See: https://stackoverflow.com/a/26438076
-
+Then verify that they've been uploaded successfully by visiting `hackage.org` in a web browser.

proto-lens-combinators/proto-lens-combinators.cabal

@@ -0,0 +1,65 @@
+name:           proto-lens-combinators
+version:        0.1.0.10
+synopsis:       Utilities functions to proto-lens.
+description:    Useful things for working with protos.
+category:       Data
+homepage:       https://github.com/google/proto-lens#readme
+bug-reports:    https://github.com/google/proto-lens/issues
+author:         Zie Weaver
+maintainer:     [email protected]
+copyright:      Google Inc.
+license:        BSD3
+license-file:   LICENSE
+build-type:     Custom
+cabal-version:  >= 1.24
+extra-source-files:
+    Changelog.md
+    tests/combinators.proto
+
+source-repository head
+  type: git
+  location: https://github.com/google/proto-lens
+  subdir: proto-lens-combinators
+
+custom-setup
+  setup-depends:
+      Cabal
+    , base >=4.8 && <4.12
+    , proto-lens-protoc ==0.3.*
+
+library
+  exposed-modules:
+      Data.ProtoLens.Combinators
+  other-modules:
+      Paths_proto_lens_combinators
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.8 && <4.12
+    , data-default-class >=0.0 && <0.2
+    , lens-family ==1.2.*
+    , proto-lens-protoc ==0.3.*
+    , transformers >=0.4 && <0.6
+  default-language: Haskell2010
+
+test-suite combinators_test
+  type: exitcode-stdio-1.0
+  main-is: combinators_test.hs
+  other-modules:
+      Paths_proto_lens_combinators
+      Proto.Combinators Proto.Combinators_Fields
+  autogen-modules:
+      Proto.Combinators Proto.Combinators_Fields
+  hs-source-dirs:
+      tests
+  build-depends:
+      HUnit
+    , base
+    , lens-family
+    , lens-family-core
+    , proto-lens
+    , proto-lens-combinators
+    , proto-lens-protoc
+    , test-framework
+    , test-framework-hunit
+  default-language: Haskell2010

proto-lens-discrimination/proto-lens-discrimination.cabal

@@ -0,0 +1,81 @@
+name:           proto-lens-discrimination
+version:        0.1.1.0
+synopsis:       Support for using proto-lens types with http://hackage.haskell.org/package/discrimination.
+description:    Reflection-based implementations of Sort for proto-lens' generated types.
+category:       Data
+homepage:       https://github.com/google/proto-lens#readme
+bug-reports:    https://github.com/google/proto-lens/issues
+author:         Andrew Pritchard
+maintainer:     [email protected]
+copyright:      Google Inc.
+license:        BSD3
+license-file:   LICENSE
+build-type:     Custom
+cabal-version:  >= 1.24
+extra-source-files:
+    tests/enum.proto
+
+source-repository head
+  type: git
+  location: https://github.com/google/proto-lens
+  subdir: proto-lens-discrimination
+
+custom-setup
+  setup-depends:
+      Cabal
+    , base >=4.8 && <4.12
+    , proto-lens-protoc ==0.3.*
+
+library
+  exposed-modules:
+      Data.ProtoLens.Sort
+      Data.ProtoLens.Group
+      Data.ProtoLens.Discrimination
+  other-modules:
+      Paths_proto_lens_discrimination
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.8 && <4.12
+    , bytestring ==0.10.*
+    , containers >=0.5 && <0.6
+    , contravariant >=1.3 && <1.5
+    , data-default >=0.5 && <0.8
+    , discrimination >=0.3 && <0.4
+    , discrimination-ieee754 ==0.1.*
+    , lens-family ==1.2.*
+    , proto-lens >=0.3 && <0.4
+    , proto-lens-protoc >=0.3 && <0.4
+    , text ==1.2.*
+  default-language: Haskell2010
+
+test-suite discrimination_test
+  type: exitcode-stdio-1.0
+  main-is: disc_test.hs
+  other-modules:
+      Proto.Enum
+      Proto.Enum_Fields
+  autogen-modules:
+      Proto.Enum
+      Proto.Enum_Fields
+  hs-source-dirs:
+      tests
+  build-depends:
+      HUnit >=1.3 && <1.7
+    , base >=4.8 && <4.12
+    , bytestring ==0.10.*
+    , containers >=0.5 && <0.6
+    , contravariant >=1.3 && <1.5
+    , data-default >=0.5 && <0.8
+    , discrimination >=0.3 && <0.4
+    , discrimination-ieee754 ==0.1.*
+    , lens-family ==1.2.*
+    , proto-lens >=0.3 && <0.4
+    , proto-lens-arbitrary >=0.1 && <0.2
+    , proto-lens-discrimination
+    , proto-lens-protoc >=0.3 && <0.4
+    , test-framework ==0.8.*
+    , test-framework-hunit ==0.3.*
+    , test-framework-quickcheck2 ==0.3.*
+    , text ==1.2.*
+  default-language: Haskell2010