Better CI caching

.github/actions/cabal-cache/action.yml

@@ -0,0 +1,18 @@
+name: Cabal dependency and incremental build caches
+runs:
+  using: composite
+  steps:
+    - name: Cache dependencies
+      uses: actions/cache@v3
+      with:
+        path: ~/.local/state/cabal/store/
+        key: cabal-${{ runner.os }}-${{ hashFiles('cabal.project.freeze') }}
+        restore-keys: |
+          cabal-${{ runner.os }}
+    - name: Cache incremental build
+      uses: actions/cache@v3
+      with:
+        path: ./dist-newstyle/
+        key: dist-${{ runner.os }}-${{ github.sha }}
+        restore-keys: |
+          dist-${{ runner.os }}

.github/workflows/check.yml

@@ -22,10 +22,7 @@ jobs:
       - uses: cachix/install-nix-action@v22
       - run: nix develop -c cabal update
       - run: nix develop -c cabal freeze
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cabal/store
-          key: cabal-${{ runner.os }}-${{ hashFiles('cabal.project.freeze') }}
+      - uses: ./.github/actions/cabal-cache
       - run: nix develop -c cabal build
   test:
     name: Test
@@ -35,10 +32,7 @@ jobs:
       - uses: cachix/install-nix-action@v22
       - run: nix develop -c cabal update
       - run: nix develop -c cabal freeze
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cabal/store
-          key: cabal-${{ runner.os }}-${{ hashFiles('cabal.project.freeze') }}
+      - uses: ./.github/actions/cabal-cache
       - run: nix develop -c cabal test
   lint:
     name: Lint
@@ -71,5 +65,7 @@ jobs:
         with:
           path: ~/.cache/yarn/v6
           key: yarn-${{ runner.os }}-${{ hashFiles('.golden/ts/yarn.lock') }}
-      - run: nix develop -c yarn install --frozen-lockfile
-      - run: nix develop -c yarn typecheck
+          restore-keys: |
+            yarn-${{ runner.os }}
+      - run: nix develop .#golden -c yarn install --frozen-lockfile
+      - run: nix develop .#golden -c yarn typecheck

.github/workflows/publish.yml

@@ -25,10 +25,7 @@ jobs:
         with:
           ghc-version: 9.4.6
       - run: cabal freeze
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cabal/store
-          key: cabal-${{ runner.os }}-${{ hashFiles('cabal.project.freeze') }}
+      - uses: ./.github/actions/cabal-cache
       - name: Build
         run: |
           # Unlike `cabal build`, `cabal install` appears to build in a

flake.nix

@@ -15,19 +15,24 @@
 
           haskPkgs = pkgs.haskell.packages."${ghcVer}";
       in {
-        devShells.default = pkgs.mkShell {
-          nativeBuildInputs = with pkgs; [
-            cabal-install
-            haskell.compiler."${ghcVer}"
-            haskPkgs.haskell-language-server
-            hlint
-            haskPkgs.hspec-golden
-            stylish-haskell
+        devShells = {
+          default = pkgs.mkShell {
+            nativeBuildInputs = with pkgs; [
+              cabal-install
+              haskell.compiler."${ghcVer}"
+              haskPkgs.haskell-language-server
+              hlint
+              haskPkgs.hspec-golden
+              stylish-haskell
+            ];
+          };
 
-            # For typechecking golden output
-            nodejs
-            yarn
-          ];
+          golden = pkgs.mkShell {
+            nativeBuildInputs = with pkgs; [
+              nodejs
+              yarn
+            ];
+          };
         };
       });
 }