switch from Travis CI to GitHub Actions

.github/workflows/test.yaml

+name: Test
+on: push
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macOS-10.14]
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install Dependencies
+        run: |
+          brew install haskell-stack shunit2 icarus-verilog || ls
+          sudo apt-get install -y haskell-stack shunit2 flex bison autoconf gperf || ls
+      - name: Cache iverilog
+        uses: actions/cache@v1
+        with:
+          path: ~/.local
+          key: ${{ runner.OS }}-iverilog-10-2
+          restore-keys: ${{ runner.OS }}-iverilog-10-2
+      - name: Install iverilog
+        run: |
+          if [ "${{ runner.OS }}" = "Linux" ]; then
+            if [ ! -e "$HOME/.local/bin/iverilog" ]; then
+              curl --retry-max-time 60 -L https://github.com/steveicarus/iverilog/archive/v10_2.tar.gz > iverilog.tar.gz
+              tar -xzf iverilog.tar.gz
+              cd iverilog-10_2
+              autoconf
+              ./configure --prefix=$HOME/.local
+              make
+              make install
+              cd ..
+            fi
+          fi
+      - name: Cache Build
+        uses: actions/cache@v1
+        with:
+          path: ~/.stack
+          key: ${{ runner.OS }}-${{ hashFiles('**/stack.yaml') }}-${{ hashFiles('**/sv2v.cabal') }}
+          restore-keys: |
+            ${{ runner.OS }}-${{ hashFiles('**/stack.yaml') }}-${{ hashFiles('**/sv2v.cabal') }}
+            ${{ runner.OS }}-${{ hashFiles('**/stack.yaml') }}-
+            ${{ runner.OS }}-
+      - name: Build
+        run: make
+      - name: Test
+        run: |
+          export PATH="$PATH:$HOME/.local/bin"
+          make test

.travis.yml

-language: generic
-
-matrix:
-  include:
-    - os: linux
-      dist: xenial
-    - os: osx
-      osx_image: xcode11
-
-cache:
-  directories:
-    - $HOME/.stack
-    - $HOME/.local
-
-addons:
-  apt:
-    packages:
-      - shunit2
-      # for stack
-      - libgmp-dev
-      # for iverilog
-      - flex
-      - bison
-      - autoconf
-      - gperf
-  homebrew:
-    packages:
-      - haskell-stack
-      - shunit2
-      - icarus-verilog
-
-before_install:
-  - |
-      set -ex
-      if [ "$TRAVIS_OS_NAME" == "linux" ]; then
-        orig_pwd=$PWD
-        mkdir -p ~/.local/bin
-        export PATH=$HOME/.local/bin:$PATH
-        # install the latest version of stack
-        if [ ! -e "$HOME/.local/bin/stack" ]; then
-          # based on: https://raw.githubusercontent.com/commercialhaskell/stack/stable/doc/travis-simple.yml
-          travis_retry curl --retry-max-time 60 -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz > stack.tar.gz
-          tar -xzf stack.tar.gz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
-        fi
-        # install iverilog 10.2
-        if [ ! -e "$HOME/.local/bin/iverilog" ]; then
-          travis_retry curl --retry-max-time 60 -L https://github.com/steveicarus/iverilog/archive/v10_2.tar.gz > v10_2.tar.gz
-          tar -xzf v10_2.tar.gz
-          cd iverilog-10_2
-          autoconf
-          ./configure --prefix=$HOME/.local
-          make
-          make install
-          cd ..
-        fi
-        cd $orig_pwd
-      fi
-      set +ex
-  - which stack iverilog shunit2
-  - stack --numeric-version
-  - iverilog -V 2> /dev/null | head -n 1
-
-install:
-  make
-
-script:
-  make test