Make travis upload new versions of both dunai and bearriver to hackage about dunai

[chriz-zeller]

I'm not sure about this, but we could try the following or a variant of it:

language: haskell

ghc:
  - "7.6.3"
  - "7.8.4"
  - "7.10.3"
  - "8.0.2"
  - "8.2.1"
env
  - PACKAGE="dunai" PACKAGE_DIR="."
  - PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"
  
install:
 - travis_retry sudo apt-get update
 - travis_retry sudo apt-get install cabal-install-1.24 alex-3.1.4 happy-1.19.5
 - export PATH=$HOME/.cabal/bin:/opt/cabal/1.24/bin:/opt/alex/3.1.4/bin:/opt/happy/1.19.5/bin:$PATH
 - travis_retry cabal update

I'm not sure whether the ghc variable needs language haskell. And I'm not sure whether it is good to let travis organise the installation of the ghc instead of doing it on our own.

[turion]

Stupid question. Is it not a problem that the password is public then?

Btw, if you want to avoid duplicating the list of subpackages every time, you can do the thing described in https://docs.travis-ci.com/user/languages/haskell/#Build-Matrix.

[ivanperez-keera]

It won't be public. It'll be encrypted by Travis. But it'll be visible by anyone with commit access to the repo, which is why it's best to have a different user for this.

[ivanperez-keera]

I just took a quick look. It seems to me that, since packages need to be compiled with a range of GHC versions, the cleanest way to do this would be to specify a build matrix that provides all possible combinations:

env:
 - GHCVER=7.6.3  PACKAGE="dunai"     PACKAGE_DIR="."
 - GHCVER=7.8.4  PACKAGE="dunai"     PACKAGE_DIR="."
 - GHCVER=7.10.3 PACKAGE="dunai"     PACKAGE_DIR="."
 - GHCVER=8.0.2  PACKAGE="dunai"     PACKAGE_DIR="."
 - GHCVER=8.2.1  PACKAGE="dunai"     PACKAGE_DIR="."

 - GHCVER=7.6.3  PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"
 - GHCVER=7.8.4  PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"
 - GHCVER=7.10.3 PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"
 - GHCVER=8.0.2  PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"
 - GHCVER=8.2.1  PACKAGE="bearriver" PACKAGE_DIR="examples/bearriver"

Is there a simpler way? (yes, we can eliminate PACKAGE_DIR if we put dunai in a subdir and bearriver in another, but that's not what I am asking.)

[ivanperez-keera]

You're absolutely right. I didn't know the current haskell image on travis had other versions of GHC installed (it didn't use to be the case). This simplifies the build process a lot.

Thanks!

[turion]

@chriz-keera 's approach seems the right one to me. I don't think we need all those directives listed after install:. Travis should be able to figure this out on its own.