CI: run SwiftFormat through hk

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
         uses: jdx/mise-action@v3
 
       - name: SwiftFormat Lint
-        run: mise exec -- swiftformat --lint . --reporter github-actions-log
+        run: hk check --all
 
   apple:
     if: github.event_name != 'pull_request' || !contains(github.event.pull_request.title, '[skip ci]')

README.md

@@ -137,6 +137,15 @@ class MyClass: NSObject {
 }
 ```
 
+## Development
+
+Install [Mise](https://mise.jdx.dev/), then install the project tools and Git hooks:
+
+```sh
+mise install
+mise exec -- hk install --mise
+```
+
 ## Credits
 
 This library is inspired by and builds upon the following projects:

hk.pkl

@@ -0,0 +1,38 @@
+amends "package://github.com/jdx/hk/releases/download/v1.57.0/hk@1.57.0#/Config.pkl"
+
+local linters = new Mapping<String, Step> {
+  ["swiftformat"] {
+    glob = "**/*.swift"
+
+    check = new CommandSpec {
+      command = new Command {
+        argv = List("swiftformat", "--lint", "--reporter", "github-actions-log", "{{files}}")
+      }
+      effect = "read"
+    }
+
+    fix = new CommandSpec {
+      command = new Command {
+        argv = List("swiftformat", "{{files}}")
+      }
+      effect = "write"
+    }
+  }
+}
+
+hooks {
+  ["pre-commit"] {
+    fix = true
+    stash = "git"
+    steps = linters
+  }
+
+  ["check"] {
+    steps = linters
+  }
+
+  ["fix"] {
+    fix = true
+    steps = linters
+  }
+}

mise.toml

@@ -1,2 +1,8 @@
+min_version = "2026.8.6"
+
+[tool_config]
+locked = true
+
 [tools]
+hk = "1"
 swiftformat = "0"