Add GitHub Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,90 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  cabal:
+    name: cabal / ghc-${{ matrix.ghc }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          # - macOS-latest
+        cabal:
+          - "latest"
+        ghc:
+          - "8.10.7"
+          - "9.0.2"
+          - "9.2.8"
+          - "9.4.8"
+          - "9.6.3"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: haskell-actions/setup@v2
+        id: setup-haskell-cabal
+        name: Setup Haskell
+        with:
+          ghc-version: ${{ matrix.ghc }}
+          cabal-version: ${{ matrix.cabal }}
+
+      - uses: actions/cache@v3
+        name: Cache cabal-store
+        with:
+          path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
+          key: ${{ matrix.os }}-${{ matrix.ghc }}-cabal
+
+      - name: Build
+        run: |
+          cabal update
+          cabal build package:prometheus --enable-tests --enable-benchmarks --write-ghc-environment-files=always --flags="buildexamples"
+
+      # TODO: Actually add tests
+      # - name: Test
+      #   run: |
+      #     cabal test package:prometheus --enable-tests
+
+  stack:
+    name: stack ${{ matrix.resolver }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          # - macOS-latest
+        stack: ["latest"]
+        resolver:
+          - "--stack-yaml ./stack-8.10.yaml"
+          - "--stack-yaml ./stack-9.0.yaml"
+          - "--stack-yaml ./stack-9.2.yaml"
+          - "--stack-yaml ./stack-9.4.yaml"
+          - "--stack-yaml ./stack-9.6.yaml"
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: haskell-actions/setup@v2
+      name: Setup Haskell Stack
+      with:
+        stack-version: ${{ matrix.stack }}
+        enable-stack: true
+
+    - uses: actions/cache@v3
+      name: Cache ~/.stack
+      with:
+        path: ~/.stack
+        key: ${{ matrix.os }}-stack-${{ matrix.resolver }}
+
+    - name: Build
+      run: |
+        stack build --test --bench --no-run-tests --no-run-benchmarks --flag prometheus:buildexamples
+
+    # TODO: Actually add tests
+    # - name: Test
+    #   run: |
+    #     stack test

Example.hs

@@ -1,6 +1,6 @@
 {-# LANGUAGE OverloadedStrings #-}
 
-module Example where
+module Main where
 
 import Control.Monad.IO.Class (liftIO)
 import System.Metrics.Prometheus.Concurrent.RegistryT

prometheus.cabal

@@ -60,6 +60,12 @@ description:
 extra-source-files: Example.hs
                   , README.md
 
+-- This flag builds the Example.hs file.  It is only used for testing.  It
+-- is enabled in CI.
+flag buildexamples
+  description: Build the Example.hs file. This is normally only used for testing.
+  default:     False
+
 library
   hs-source-dirs: src
   default-language: Haskell2010
@@ -95,6 +101,20 @@ library
                , wai             >= 3.2  && < 3.3
                , warp            >= 3.2  && < 3.5
 
+executable prometheus-example
+  main-is: Example.hs
+  default-language: Haskell2010
+
+  ghc-options: -Wall -fwarn-tabs -fno-warn-unused-do-bind
+
+  build-depends: base
+               , prometheus
+
+  if flag(buildexamples)
+    buildable:         True
+  else
+    buildable:         False
+
 source-repository head
   type:     git
   location: https://github.com/bitnomial/prometheus

stack-8.10.yaml

@@ -1,5 +1,4 @@
 ---
-
 resolver: lts-18.28
 flags: {}
 packages:

stack-8.8.yaml → stack-9.0.yaml

@@ -1,7 +1,6 @@
 ---
-
-resolver: lts-16.5
+resolver: lts-19.33
 flags: {}
 packages:
-  - '.'
+  - "."
 extra-deps: []

stack-9.4.yaml

@@ -0,0 +1,6 @@
+---
+resolver: lts-21.25
+flags: {}
+packages:
+  - "."
+extra-deps: []

stack-8.6.yaml → stack-9.6.yaml

@@ -1,5 +1,6 @@
-resolver: lts-14.27
+---
+resolver: lts-22.0
 flags: {}
 packages:
-  - '.'
+  - "."
 extra-deps: []

stack.yaml

@@ -0,0 +1 @@
+./stack-9.6.yaml

stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    sha256: caa77fdbc5b9f698262b21ee78030133272ec53116ad6ddbefdc4c321f668e0c
-    size: 640014
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/21/4.yaml
-  original: lts-21.4
+    sha256: e176944bc843f740e05242fa7a66ca1f440c127e425254f7f1257f9b19add23f
+    size: 712153
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/0.yaml
+  original: lts-22.0