Add PromptKit request validation adapter

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # PromptKit request validation implementation plan
 
-Status: Stage 1 complete; implementation is ongoing.
+Status: Stages 1 and 2 complete; implementation is ongoing.
 
 ## Authority, scope, and baseline
 
@@ -153,6 +153,16 @@ capabilities are cleared. Run the focused tests and ckprompt suite.
 **Complete when:** the public API and adapter work without command dispatch,
 with explicit capability opt-in and the selected wiring/error behavior.
 
+**Completed:** 2026-10-12. Added `ValidationRequest`, the optional suite callback,
+and `WithRequestValidation`. The callback forwards a nil-builder seed through
+PromptKit validation, preserves original selection and invocation objects, and
+retains configuration diagnostics. Adapter tests cover suite composition,
+successful nil-builder validation, builder failure before loading, independent
+retention of nil-loader issues, and installation reporting after capabilities
+are cleared. Focused adapter tests and
+`GOTOOLCHAIN=local go test -count=1 ./...` passed from
+`integrations/ckprompt`.
+
 ## Stage 3: Verify native delegation, request construction, and cancellation
 
 **Primary files:** a focused `integrations/ckprompt/validation_adapters_test.go`

integrations/ckprompt/adapters.go

@@ -43,8 +43,8 @@ type RequirementsRequest struct {
 }
 
 // Suite describes application-owned input, shared state, and optional catalog,
-// named inspection, and requirements inspection capabilities. Its private
-// issues retain adapter construction failures.
+// named inspection, requirements inspection, and concrete request validation
+// capabilities. Its private issues retain adapter construction failures.
 // Factory results and callback effects remain caller-owned: Command does not
 // deep-copy arbitrary objects or repair aliases returned by factories.
 // A reached operation prepares one input, applies its captured selectors, and
@@ -52,18 +52,18 @@ type RequirementsRequest struct {
 // Factories are not invoked during construction, installation, help, or version,
 // and need not run after failure.
 type Suite[I, S any] struct {
-	// NewInput is called once when definition, requirements, or catalog input
+	// NewInput is called once when definition, requirements, validation, or catalog input
 	// preparation is reached, before applying selectors and calling CheckInput.
 	// If nil, input is the zero value of I, including nil for pointer types.
 	NewInput func() I
-	// NewState is called once when an inspection or catalog callback is reached,
+	// NewState is called once when an inspection, validation, or catalog callback is reached,
 	// after input checks pass. If nil, state is the zero value of S, including
 	// nil for pointer types.
 	NewState func() S
 	// Selectors declares the original typed flags accepted by definition,
-	// requirements, and catalog commands.
+	// requirements, validation, and catalog commands.
 	Selectors []commandkit.Flag[I]
-	// CheckInput validates selected definition, requirements, or catalog input
+	// CheckInput validates selected definition, requirements, validation, or catalog input
 	// before state creation.
 	CheckInput func(ckconfig.Selection, I) error
 	// InspectPrompt inspects the selected prompt after input and state preparation.
@@ -74,6 +74,10 @@ type Suite[I, S any] struct {
 	// state preparation. It is optional; a nil callback omits the requirements
 	// command without disabling other capabilities.
 	InspectRequirements func(context.Context, RequirementsRequest, I, S) (commandkit.Acquired[*promptkit.RequirementInspection], error)
+	// ValidateRequest validates a concrete PromptKit request after input and state
+	// preparation. It is optional; a nil callback omits request validation without
+	// disabling other capabilities.
+	ValidateRequest func(context.Context, ValidationRequest, I, S) (commandkit.Acquired[struct{}], error)
 	// ListPrompts lists prompt identities after input and state preparation.
 	// It is optional; a nil callback does not install a prompt catalog command.
 	ListPrompts func(context.Context, ckconfig.Selection, I, S) (commandkit.Acquired[[]promptkit.PromptIdentity], error)
@@ -84,6 +88,62 @@ type Suite[I, S any] struct {
 	issues []error
 }
 
+// WithRequestValidation attaches PromptKit-backed concrete request validation
+// to suite. The loader receives the request's original selection; the builder,
+// when present, runs first and its returned request is passed to PromptKit
+// unchanged. A nil builder forwards the seed request. PromptKit's native
+// validation errors and the engine loader's configuration diagnostics are
+// returned through the acquisition. A nil loader is retained as a suite wiring
+// issue and does not install a validation callback. Caller-owned callback
+// references and objects remain caller-owned.
+func WithRequestValidation[I, S any](
+	suite Suite[I, S],
+	load func(context.Context, ckconfig.Selection, I, S) (*promptkit.Engine, error),
+	build func(context.Context, ValidationRequest, I, S) (promptkit.RunRequest, error),
+) Suite[I, S] {
+	if load == nil {
+		issues := append([]error(nil), suite.issues...)
+		suite.issues = append(issues, errors.New("PromptKit engine loader is nil"))
+		return suite
+	}
+
+	suite.ValidateRequest = func(ctx context.Context, request ValidationRequest, input I, state S) (commandkit.Acquired[struct{}], error) {
+		if err := promptKitContextError(ctx); err != nil {
+			return commandkit.Acquired[struct{}]{}, fmt.Errorf("PromptKit request validation before building: %w", err)
+		}
+
+		concreteRequest := request.Request
+		if build != nil {
+			built, err := build(ctx, request, input, state)
+			if err != nil {
+				return commandkit.Acquired[struct{}]{}, err
+			}
+			concreteRequest = built
+		}
+
+		if err := promptKitContextError(ctx); err != nil {
+			return commandkit.Acquired[struct{}]{}, fmt.Errorf("PromptKit request validation after building: %w", err)
+		}
+
+		engine, _, diagnostics, err := loadPromptKitEngine(ctx, request.Selection, input, state, "", load)
+		if err != nil {
+			return commandkit.Acquired[struct{}]{Diagnostics: diagnostics}, err
+		}
+		if err := promptKitContextError(ctx); err != nil {
+			return commandkit.Acquired[struct{}]{Diagnostics: diagnostics}, fmt.Errorf("PromptKit request validation before native validation: %w", err)
+		}
+
+		if err := engine.ValidateRequest(ctx, concreteRequest); err != nil {
+			return commandkit.Acquired[struct{}]{Diagnostics: diagnostics}, err
+		}
+		if err := promptKitContextError(ctx); err != nil {
+			return commandkit.Acquired[struct{}]{Diagnostics: diagnostics}, fmt.Errorf("PromptKit request validation after native validation: %w", err)
+		}
+		return commandkit.Acquired[struct{}]{Diagnostics: diagnostics}, nil
+	}
+	return suite
+}
+
 type engineLoader[I, S any] func(context.Context, ckconfig.Selection, I, S) (*promptkit.Engine, error)
 
 // ConfigScope adapts PromptKit's captured configuration inspection to the

integrations/ckprompt/validation.go

@@ -0,0 +1,16 @@
+package ckprompt
+
+import (
+	"gitea.maximumdirect.net/eric/CommandKit/integrations/ckconfig"
+	promptkit "gitea.maximumdirect.net/eric/promptkit"
+)
+
+// ValidationRequest carries the configuration selection and concrete
+// PromptKit request to validate.
+type ValidationRequest struct {
+	// Selection identifies the configuration sources used to load the engine.
+	Selection ckconfig.Selection
+	// Request is the seed request, or the request returned by a validation
+	// builder when one is configured.
+	Request promptkit.RunRequest
+}

integrations/ckprompt/validation_adapters_test.go

@@ -0,0 +1,100 @@
+package ckprompt
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+
+	commandkit "gitea.maximumdirect.net/eric/CommandKit"
+	"gitea.maximumdirect.net/eric/CommandKit/integrations/ckconfig"
+	promptkit "gitea.maximumdirect.net/eric/promptkit"
+)
+
+func TestWithRequestValidationPreservesSuiteAndValidatesSeedWithoutBuilder(t *testing.T) {
+	type contextKey struct{}
+	type input struct{ value string }
+	type state struct{ value string }
+
+	ctx := context.WithValue(context.Background(), contextKey{}, "invocation")
+	engine := adapterEngine(t)
+	selection := ckconfig.Selection{Config: commandkit.Supplied[string]{Value: "config.yml", Set: true}}
+	inspect := func(context.Context, RequirementsRequest, input, state) (commandkit.Acquired[*promptkit.RequirementInspection], error) {
+		return commandkit.Acquired[*promptkit.RequirementInspection]{}, nil
+	}
+	newInput := func() input { return input{value: "factory"} }
+	suite := Suite[input, state]{InspectRequirements: inspect, NewInput: newInput}
+	loaderCalls := 0
+	suite = WithRequestValidation(suite, func(gotContext context.Context, gotSelection ckconfig.Selection, gotInput input, gotState state) (*promptkit.Engine, error) {
+		loaderCalls++
+		if gotContext != ctx || gotContext.Value(contextKey{}) != "invocation" || gotSelection != selection || gotInput.value != "input" || gotState.value != "state" {
+			t.Errorf("loader args = (%v, %#v, %#v, %#v)", gotContext, gotSelection, gotInput, gotState)
+		}
+		return engine, nil
+	}, nil)
+	if suite.InspectRequirements == nil || suite.NewInput == nil || suite.ValidateRequest == nil {
+		t.Fatalf("composed suite lost a member or omitted validation: %#v", suite)
+	}
+
+	acquired, err := suite.ValidateRequest(ctx, ValidationRequest{
+		Selection: selection,
+		Request:   promptkit.RunRequest{PromptID: "empty", ProfileID: "default"},
+	}, input{value: "input"}, state{value: "state"})
+	if err != nil {
+		t.Fatalf("validate seed request: %v", err)
+	}
+	if acquired.Value != (struct{}{}) || len(acquired.Diagnostics) != 0 || loaderCalls != 1 {
+		t.Fatalf("acquisition = %#v, loader calls = %d", acquired, loaderCalls)
+	}
+}
+
+func TestWithRequestValidationBuilderFailurePrecedesLoading(t *testing.T) {
+	type input struct{ value string }
+	type state struct{ value string }
+	buildErr := errors.New("cannot build request")
+	loadCalls, buildCalls := 0, 0
+	suite := WithRequestValidation(
+		Suite[input, state]{},
+		func(context.Context, ckconfig.Selection, input, state) (*promptkit.Engine, error) {
+			loadCalls++
+			return nil, errors.New("loader should not run")
+		},
+		func(ctx context.Context, request ValidationRequest, gotInput input, gotState state) (promptkit.RunRequest, error) {
+			buildCalls++
+			if ctx == nil || request.Request.PromptID != "seed" || gotInput.value != "input" || gotState.value != "state" {
+				t.Errorf("builder args = (%v, %#v, %#v, %#v)", ctx, request, gotInput, gotState)
+			}
+			return promptkit.RunRequest{}, buildErr
+		},
+	)
+
+	_, err := suite.ValidateRequest(context.Background(), ValidationRequest{Request: promptkit.RunRequest{PromptID: "seed"}}, input{value: "input"}, state{value: "state"})
+	if !errors.Is(err, buildErr) || buildCalls != 1 || loadCalls != 0 {
+		t.Fatalf("validation = (%v), builder calls = %d, loader calls = %d", err, buildCalls, loadCalls)
+	}
+}
+
+func TestWithRequestValidationRetainsNilLoaderIssueIndependently(t *testing.T) {
+	firstIssue := errors.New("existing adapter issue")
+	backing := make([]error, 1, 3)
+	backing[0] = firstIssue
+	existingCallback := func(context.Context, ValidationRequest, struct{}, struct{}) (commandkit.Acquired[struct{}], error) {
+		return commandkit.Acquired[struct{}]{}, nil
+	}
+	suite := Suite[struct{}, struct{}]{ValidateRequest: existingCallback, issues: backing[:1]}
+	composed := WithRequestValidation(suite, nil, nil)
+	if composed.ValidateRequest == nil || len(composed.issues) != 2 {
+		t.Fatalf("nil loader composition = %#v", composed)
+	}
+	if _, err := composed.ValidateRequest(context.Background(), ValidationRequest{}, struct{}{}, struct{}{}); err != nil {
+		t.Fatalf("nil loader replaced the existing validation callback: %v", err)
+	}
+	if !errors.Is(composed.issues[0], firstIssue) || composed.issues[1] == nil || backing[:cap(backing)][1] != nil {
+		t.Fatalf("issues = %#v, original backing = %#v", composed.issues, backing[:cap(backing)])
+	}
+
+	composed.ValidateRequest = nil
+	if err := newPromptTestApp(t).Register(Command(composed)); err == nil || !strings.Contains(err.Error(), "PromptKit engine loader is nil") {
+		t.Fatalf("installation did not report retained issue after capabilities were cleared: %v", err)
+	}
+}