Migrate from Travis CI to GitHub Actions

Travis CI recently announced [changes to its pricing model](https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing) that will affect OSS projects. Whereas Travis previously allowed unrestricted hours for OSS projects to run on their build machines, the new pricing model will require the use of credits, of which free plans only have a limited quantity. Moreover, Travis now takes an extraordinarily long time to actually serve CI requests, which is infeasible in the long term. As a result, I have decided (with encouragement from other Haskell maintainers, see [here](https://old.reddit.com/r/haskell/comments/jvbs49/psa_maintainers_should_think_about_migrating_off/)) to migrate to GitHub Actions. This relies on a very recent version of `haskell-ci` that features a GitHub Actions backend.
ekmett · Dec 31, 2020 · cba1a12 · cba1a12
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diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
@@ -0,0 +1,204 @@
+# This GitHub workflow config has been generated by a script via
+#
+#   haskell-ci 'github' '--config=cabal.haskell-ci' 'cabal.project'
+#
+# To regenerate the script (for example after adjusting tested-with) run
+#
+#   haskell-ci regenerate
+#
+# For more information, see https://github.com/haskell-CI/haskell-ci
+#
+# version: 0.11.20201230
+#
+# REGENDATA ("0.11.20201230",["github","--config=cabal.haskell-ci","cabal.project"])
+#
+name: Haskell-CI
+on:
+  - push
+  - pull_request
+jobs:
+  irc:
+    name: Haskell-CI (IRC notification)
+    runs-on: ubuntu-18.04
+    needs:
+      - linux
+    if: ${{ always() && (github.repository == 'ekmett/reflection') }}
+    strategy:
+      fail-fast: false
+    steps:
+      - name: IRC success notification (irc.freenode.org#haskell-lens)
+        uses: Gottox/[email protected]
+        if: needs.linux.result == 'success'
+        with:
+          channel: "#haskell-lens"
+          message: "\x0313reflection\x03/\x0306${{ github.ref }}\x03 \x0314${{ github.sha }}\x03 https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }} The build succeeded."
+          nickname: github-actions
+          server: irc.freenode.org
+      - name: IRC failure notification (irc.freenode.org#haskell-lens)
+        uses: Gottox/[email protected]
+        if: needs.linux.result != 'success'
+        with:
+          channel: "#haskell-lens"
+          message: "\x0313reflection\x03/\x0306${{ github.ref }}\x03 \x0314${{ github.sha }}\x03 https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }} The build failed."
+          nickname: github-actions
+          server: irc.freenode.org
+  linux:
+    name: Haskell-CI Linux - GHC ${{ matrix.ghc }}
+    runs-on: ubuntu-18.04
+    container:
+      image: buildpack-deps:bionic
+    continue-on-error: ${{ matrix.allow-failure }}
+    strategy:
+      matrix:
+        include:
+          - ghc: 8.10.1
+            allow-failure: false
+          - ghc: 8.8.3
+            allow-failure: false
+          - ghc: 8.6.5
+            allow-failure: false
+          - ghc: 8.4.4
+            allow-failure: false
+          - ghc: 8.2.2
+            allow-failure: false
+          - ghc: 8.0.2
+            allow-failure: false
+          - ghc: 7.10.3
+            allow-failure: false
+          - ghc: 7.8.4
+            allow-failure: false
+          - ghc: 7.6.3
+            allow-failure: false
+          - ghc: 7.4.2
+            allow-failure: false
+          - ghc: 7.2.2
+            allow-failure: true
+          - ghc: 7.0.4
+            allow-failure: true
+      fail-fast: false
+    steps:
+      - name: apt
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git software-properties-common
+          apt-add-repository -y 'ppa:hvr/ghc'
+          apt-get update
+          apt-get install -y ghc-$GHC_VERSION cabal-install-3.2
+        env:
+          GHC_VERSION: ${{ matrix.ghc }}
+      - name: Set PATH and environment variables
+        run: |
+          echo "$HOME/.cabal/bin" >> $GITHUB_PATH
+          echo "LANG=C.UTF-8" >> $GITHUB_ENV
+          echo "CABAL_DIR=$HOME/.cabal" >> $GITHUB_ENV
+          echo "CABAL_CONFIG=$HOME/.cabal/config" >> $GITHUB_ENV
+          HC=/opt/ghc/$GHC_VERSION/bin/ghc
+          echo "HC=$HC" >> $GITHUB_ENV
+          echo "HCPKG=/opt/ghc/$GHC_VERSION/bin/ghc-pkg" >> $GITHUB_ENV
+          echo "HADDOCK=/opt/ghc/$GHC_VERSION/bin/haddock" >> $GITHUB_ENV
+          echo "CABAL=/opt/cabal/3.2/bin/cabal -vnormal+nowrap" >> $GITHUB_ENV
+          HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\d+)\.(\d+)\.(\d+)(\.(\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')
+          echo "HCNUMVER=$HCNUMVER" >> $GITHUB_ENV
+          echo "ARG_TESTS=--enable-tests" >> $GITHUB_ENV
+          echo "ARG_BENCH=--enable-benchmarks" >> $GITHUB_ENV
+          echo "ARG_COMPILER=--ghc --with-compiler=/opt/ghc/$GHC_VERSION/bin/ghc" >> $GITHUB_ENV
+          echo "GHCJSARITH=0" >> $GITHUB_ENV
+        env:
+          GHC_VERSION: ${{ matrix.ghc }}
+      - name: env
+        run: |
+          env
+      - name: write cabal config
+        run: |
+          mkdir -p $CABAL_DIR
+          cat >> $CABAL_CONFIG <<EOF
+          remote-build-reporting: anonymous
+          write-ghc-environment-files: never
+          remote-repo-cache: $CABAL_DIR/packages
+          logs-dir:          $CABAL_DIR/logs
+          world-file:        $CABAL_DIR/world
+          extra-prog-path:   $CABAL_DIR/bin
+          symlink-bindir:    $CABAL_DIR/bin
+          installdir:        $CABAL_DIR/bin
+          build-summary:     $CABAL_DIR/logs/build.log
+          store-dir:         $CABAL_DIR/store
+          install-dirs user
+            prefix: $CABAL_DIR
+          repository hackage.haskell.org
+            url: http://hackage.haskell.org/
+          EOF
+          cat $CABAL_CONFIG
+      - name: versions
+        run: |
+          $HC --version || true
+          $HC --print-project-git-commit-id || true
+          $CABAL --version || true
+      - name: update cabal index
+        run: |
+          $CABAL v2-update -v
+      - name: install cabal-plan
+        run: |
+          mkdir -p $HOME/.cabal/bin
+          curl -sL https://github.com/haskell-hvr/cabal-plan/releases/download/v0.6.2.0/cabal-plan-0.6.2.0-x86_64-linux.xz > cabal-plan.xz
+          echo 'de73600b1836d3f55e32d80385acc055fd97f60eaa0ab68a755302685f5d81bc  cabal-plan.xz' | sha256sum -c -
+          xz -d < cabal-plan.xz > $HOME/.cabal/bin/cabal-plan
+          rm -f cabal-plan.xz
+          chmod a+x $HOME/.cabal/bin/cabal-plan
+          cabal-plan --version
+      - name: checkout
+        uses: actions/checkout@v2
+        with:
+          path: source
+      - name: sdist
+        run: |
+          mkdir -p sdist
+          cd source || false
+          $CABAL sdist all --output-dir $GITHUB_WORKSPACE/sdist
+      - name: unpack
+        run: |
+          mkdir -p unpacked
+          find sdist -maxdepth 1 -type f -name '*.tar.gz' -exec tar -C $GITHUB_WORKSPACE/unpacked -xzvf {} \;
+      - name: generate cabal.project
+        run: |
+          PKGDIR_reflection="$(find "$GITHUB_WORKSPACE/unpacked" -maxdepth 1 -type d -regex '.*/reflection-[0-9.]*')"
+          echo "PKGDIR_reflection=${PKGDIR_reflection}" >> $GITHUB_ENV
+          PKGDIR_reflection_examples="$(find "$GITHUB_WORKSPACE/unpacked" -maxdepth 1 -type d -regex '.*/reflection-examples-[0-9.]*')"
+          echo "PKGDIR_reflection_examples=${PKGDIR_reflection_examples}" >> $GITHUB_ENV
+          touch cabal.project
+          touch cabal.project.local
+          echo "packages: ${PKGDIR_reflection}" >> cabal.project
+          if [ $((HCNUMVER >= 71000)) -ne 0 ] ; then echo "packages: ${PKGDIR_reflection_examples}" >> cabal.project ; fi
+          cat >> cabal.project <<EOF
+          EOF
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(reflection|reflection-examples)$/; }' >> cabal.project.local
+          cat cabal.project
+          cat cabal.project.local
+      - name: dump install plan
+        run: |
+          $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
+          cabal-plan
+      - name: cache
+        uses: actions/cache@v2
+        with:
+          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ github.sha }}
+          path: ~/.cabal/store
+          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+      - name: build
+        run: |
+          $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --write-ghc-environment-files=always
+      - name: tests
+        run: |
+          $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct
+      - name: cabal check
+        run: |
+          cd ${PKGDIR_reflection} || false
+          ${CABAL} -vnormal check
+          if [ $((HCNUMVER >= 71000)) -ne 0 ] ; then cd ${PKGDIR_reflection_examples} || false ; fi
+          if [ $((HCNUMVER >= 71000)) -ne 0 ] ; then ${CABAL} -vnormal check ; fi
+      - name: haddock
+        run: |
+          $CABAL v2-haddock $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all
+      - name: unconstrained build
+        run: |
+          rm -f cabal.project.local
+          $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
diff --git a/.travis.yml b/.travis.yml
diff --git a/README.markdown b/README.markdown
@@ -1,7 +1,7 @@
 reflection
 ==========
 
-[![Hackage](https://img.shields.io/hackage/v/reflection.svg)](https://hackage.haskell.org/package/reflection) [![Build Status](https://secure.travis-ci.org/ekmett/reflection.png?branch=master)](http://travis-ci.org/ekmett/reflection)
+[![Hackage](https://img.shields.io/hackage/v/reflection.svg)](https://hackage.haskell.org/package/reflection) [![Build Status](https://github.com/ekmett/reflection/workflows/Haskell-CI/badge.svg)](https://github.com/ekmett/reflection/actions?query=workflow%3AHaskell-CI)
 
 This package provides an implementation of the ideas presented in [Functional Pearl: Implicit Configurations](http://okmij.org/ftp/Haskell/tr-15-04.pdf) by Oleg Kiselyov and Chung-Chieh Shan. However, the API has been implemented in a much more efficient manner.
 

diff --git a/cabal.haskell-ci b/cabal.haskell-ci
@@ -4,4 +4,5 @@ jobs-selection:         any
 install-dependencies:   False
 allow-failures:         <7.3
 irc-channels:           irc.freenode.org#haskell-lens
+irc-if-in-origin-repo:  True
 error-missing-methods:  none