Deploy Cabal haddocks to haskell/cabal-website.

Fixes #3543.

.travis.yml

@@ -22,6 +22,15 @@ before_install:
  - export PATH=$HOME/.cabal/bin:/opt/ghc/$GHCVER/bin:/opt/cabal/1.24/bin:$PATH
  - git version
 
+ # Set up deployment to the haskell/cabal-website repo.
+ - git clone --depth=50 https://github.com/haskell/cabal-website.git ../cabal-website
+ - cd ../cabal-website
+ - openssl aes-256-cbc -K $encrypted_edaf6551664d_key -iv $encrypted_edaf6551664d_iv -in id_ed25519_cabal_website.aes256.enc -out id_ed25519 -d
+ - mv id_ed25519 ~/.ssh/id_ed25519
+ - chmod 400 ~/.ssh/id_ed25519
+ - git checkout -b --track gh-pages origin/gh-pages
+ - cd -
+
 install:
  # We intentionally do not install anything before trying to build Cabal because
  # it should build with each supported GHC version out-of-the-box.
@@ -33,6 +42,17 @@ install:
 script:
  - ./travis-script.sh -j
 
+# Deploy Haddocks to the haskell/cabal-website repo.
+after_success:
+ - git config --global user.email "builds@travis-ci.org"
+ - git config --global user.name "Travis CI User"
+ - mkdir -p ../cabal-website/doc/html
+ - mv Cabal/dist/doc/html/Cabal ../cabal-website/doc/html/Cabal
+ - cd ../cabal-website
+ - git add .
+ - git commit --amend -m "Deploy to GitHub ($(date))."
+ - test $TRAVIS_PULL_REQUEST == "false" && test $TRAVIS_BRANCH == "master" && git push --force --quiet git@github.com:haskell/haskell-website.git gh-pages
+
 matrix:
   allow_failures:
    - env: GHCVER=head

travis-script.sh

@@ -214,6 +214,7 @@ cabalinstall_build() {
     ./dist/setup/setup sdist
     install_from_tarball
 
+    cd ..
 }
 
 timed "cabal-install dependencies" cabalinstall_dependencies