Demonstrate main-relative companion loading

examples/consumers/main_relative_test.go

@@ -0,0 +1,46 @@
+package consumers_test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	configkit "go.maximumdirect.net/configkit"
+	"go.maximumdirect.net/configkit/examples/consumers"
+)
+
+func Example_mainRelativeCompanions() {
+	result, err := consumers.LoadCompanionConfig(fixture("main-relative", "main.yml"), "live")
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println(result.Config.Mode, result.Config.Prompts)
+	// Output: overlay [{shared operator replacement } {bundled bundled text } {local local text transitive detail}]
+}
+
+func TestMainRelativeStrictPeers(t *testing.T) {
+	root := t.TempDir()
+	for name, contents := range map[string]string{
+		"main.yml": "mode: main\n", "prompts.yml": "id: duplicate\ntext: first\n", "operator/second.yml": "id: duplicate\ntext: second\n",
+	} {
+		file := filepath.Join(root, name)
+		if err := os.MkdirAll(filepath.Dir(file), 0700); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(file, []byte(contents), 0600); err != nil {
+			t.Fatal(err)
+		}
+	}
+	_, err := consumers.LoadCompanionConfig(filepath.Join(root, "main.yml"), "")
+	if err == nil {
+		t.Fatal("duplicate peer identities succeeded")
+	}
+	for _, d := range err.(*configkit.LoadError).Diagnostics() {
+		if d.Code == configkit.CodeComposeConflict {
+			return
+		}
+	}
+	t.Fatalf("diagnostics = %#v", err.(*configkit.LoadError).Diagnostics())
+}