Fix build cache issues (#192)

.github/workflows/ci.yml

@@ -2,6 +2,7 @@
 # - https://github.com/actions/cache/blob/main/examples.md#haskell---cabal
 # - https://github.com/haskell/time/blob/master/.github/workflows/ci.yml
 # - https://github.com/stackbuilders/stache/blob/master/.github/workflows/ci.yaml
+# - https://markkarpov.com/post/github-actions-for-haskell-ci.html
 ---
 name: CI
 
@@ -25,34 +26,28 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - uses: haskell/actions/setup@v1
+      - if: ${{ runner.os == 'Linux' }}
+        run: |
+          sudo apt-get update
+          sudo apt-get install zsh
+      - if: ${{ runner.os == 'macOS' }}
+        run: |
+          brew update
+          brew install zsh
+      - uses: haskell/actions/setup@v2
         with:
           ghc-version: ${{ matrix.ghc }}
           cabal-version: "3.6"
-      - run: |
-          if [ "$RUNNER_OS" == "Linux" ]
-          then
-            sudo apt-get update
-            sudo apt-get install zsh
-          else
-            brew update
-            brew install zsh
-          fi
-      - run: cabal update
+        id: setup-haskell
       - run: cabal configure --enable-tests
       - run: cabal freeze
       - uses: actions/cache@v3
         with:
-          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('*.cabal', 'cabal.project.freeze') }}
-          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}
           path: |
-            ~/.cabal/packages
-            ~/.cabal/store
+            ${{ steps.setup-haskell.outputs.cabal-store }}
             dist-newstyle
-      - run: cabal build --only-dependencies
+          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
       - run: cabal build
       - run: cabal test
-      - run: |
-          # Fixes issue with different haddock coverage with different ghc versions https://github.com/haskell/haddock/issues/123
-          cabal haddock | grep "100%" | wc -l | grep -E "[4-9]|[1-9][0-9]+" ||
-          (echo "Haddock failed with exit code 1. Have you checked that the minimum of 4 modules with 100% documentation is fulfilled?" && false)
+      - run: ./script/haddock

.gitignore

@@ -7,6 +7,7 @@ cabal-dev
 *.dyn_o
 *.dyn_hi
 .cabal-sandbox/
+.envrc
 .hpc
 .hsenv
 .tool-versions

script/haddock

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+min_count=4
+count=$(cabal haddock | grep "100%" | wc -l)
+
+if [ "$count" -le "$min_count" ];
+then
+  echo "Haddock failed with exit code 1. Have you checked that the minimum of ${min_count} modules with 100% documentation is fulfilled?"
+  exit 1
+fi