[Travis] Unpack and install stack manually

Author: Mistral Contrastin

.travis.yml

@@ -5,13 +5,16 @@ before_install:
 - sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 575159689BEFB442
 - echo 'deb http://download.fpcomplete.com/ubuntu precise main'|sudo tee /etc/apt/sources.list.d/fpco.list
 - sudo apt-get update -qq
-- sudo apt-get install stack -y -qq
-- stack setup
+- mkdir -p ~/.local/bin
+- export PATH=$HOME/.local/bin:$PATH
+- travis_retry curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+install:
+- stack --no-terminal --install-ghc test --only-dependencies
 script:
 - echo $TRAVIS_TAG
 - "GHC_OPTIONS=\"--ghc-options=\"$(ruby -e 'print (ENV[%q|TRAVIS_TAG|] =~ /v/ ? %q|-O3| : %q|-O0|)')\"\""
 - echo $GHC_OPTIONS
-- stack haddock --test -j 4 $GHC_OPTIONS
+- stack --no-terminal haddock --test --no-haddock-deps -j 4 $GHC_OPTIONS
 deploy:
 - provider: releases
   api_key: