enable travis

.travis.yml

@@ -0,0 +1,45 @@
+# Adapted from https://github.com/commercialhaskell/stack
+language: c
+sudo: false
+
+cache:
+    directories:
+        - $HOME/.ghc
+        - $HOME/.cabal
+        - $HOME/.stack
+        - .stack-work
+
+matrix:
+  include:
+    # ghc 8.6.3
+  - env: STACK='stack --resolver=lts-13.0' CACHE_NAME=8.6.3
+    addons: {apt: {packages: [libgmp-dev]}}
+
+    # Use the resolver in stack.yaml
+  - env: STACK=stack CACHE_NAME=stack-linux
+    addons: {apt: {packages: [libgmp-dev]}}
+
+  - env: STACK=stack CACHE_NAME=stack-osx
+    os: osx
+    addons: {apt: {packages: [libgmp-dev]}}
+
+
+install:
+ - unset CC
+ - export PATH=$HOME/.local/bin:/opt/ghc/$GHCVER/bin:$PATH
+ - ./.travis/install-ghr.sh
+ - ./.travis/install-stack.sh
+
+script:
+ - echo "$(stack ghc -- --version) [$(stack ghc -- --print-project-git-commit-id 2> /dev/null || echo '?')]"
+ - GHC_OPTIONS="-Werror"
+ - |
+   set -ex
+   $STACK --no-terminal build --ghc-options="$GHC_OPTIONS"
+   set +ex
+
+after_success:
+ - |
+   # Build and ship binary
+   ./.travis/attach-binary.sh
+

.travis/attach-binary.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+set -o errexit -o verbose
+
+if test ! "$BUILD_BINARY" || test ! "$TRAVIS_TAG"
+then
+  echo 'This is not a release build.'
+elif test ! "$GITHUB_TOKEN"
+then
+  echo 'The GITHUB_TOKEN environment variable is not set!'
+  exit 1
+else
+  echo "Building binary for $TRAVIS_OS_NAME to $TRAVIS_TAG..."
+  stack build --ghc-options -O2 --pedantic
+  echo "Attaching binary for $TRAVIS_OS_NAME to $TRAVIS_TAG..."
+  OWNER="$(echo "$TRAVIS_REPO_SLUG" | cut -f1 -d/)"
+  REPO="$(echo "$TRAVIS_REPO_SLUG" | cut -f2 -d/)"
+  BIN="$(stack path --local-install-root)/bin/$REPO"
+  BUNDLE_NAME="$REPO-$TRAVIS_TAG-$TRAVIS_OS_NAME.tar.gz"
+  cp "$BIN" "./$REPO"
+  chmod +x "./$REPO"
+  tar -czf "$BUNDLE_NAME" "$REPO"
+  echo "SHA256:"
+  shasum -a 256 "$BUNDLE_NAME"
+  ghr -t "$GITHUB_TOKEN" -u "$OWNER" -r "$REPO" --replace "$(git describe --tags)" "$BUNDLE_NAME"
+fi

.travis/install-ghr.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+set -o errexit -o verbose
+
+if test ! "$BUILD_BINARY" || test ! "$TRAVIS_TAG"
+then
+  echo 'This is not a release build.'
+else
+    if [ "$TRAVIS_OS_NAME" = "linux" ] 
+    then
+        ARCH="linux"
+    else
+        ARCH="darwin"
+    fi
+  echo "Installing ghr"
+  URL="https://github.com/tcnksm/ghr/releases/download/v0.5.4/ghr_v0.5.4_${ARCH}_386.zip"
+  curl -L ${URL} > ghr.zip
+  mkdir -p "$HOME/bin"
+  export PATH="$HOME/bin:$PATH"
+  unzip ghr.zip -d "$HOME/bin"
+  rm ghr.zip
+fi

.travis/install-stack.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+# Adapted from https://github.com/commercialhaskell/stack
+
+set -eux
+
+travis_retry() {
+  cmd=$*
+  $cmd || (sleep 2 && $cmd) || (sleep 10 && $cmd)
+}
+
+fetch_stack_osx() {
+  curl -skL https://www.stackage.org/stack/osx-x86_64 | tar xz --strip-components=1 --include '*/stack' -C ~/.local/bin;
+}
+
+fetch_stack_linux() {
+  curl -sL https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack';
+}
+
+# We need stack to generate cabal files with precise bounds, even for cabal
+# builds.
+mkdir -p ~/.local/bin;
+if [ "$(uname)" = "Darwin" ]; then
+  travis_retry fetch_stack_osx
+else
+  travis_retry fetch_stack_linux
+fi
+
+travis_retry stack --no-terminal setup;