Derive family member publish destinations

internal/config/validate_publish.go

@@ -9,6 +9,36 @@ import (
 	"gitea.maximumdirect.net/eric/narratio/internal/pathsafe"
 )
 
+type derivedPublishDestination struct {
+	index int
+	dest  string
+}
+
+func deriveMissingPublishDestinations(cfg *PublishConfig, scriptorium *ScriptoriumConfig, notarius *NotariusConfig) []derivedPublishDestination {
+	if cfg == nil {
+		return nil
+	}
+	configuredOutputs := scriptoriumOutputPathMap(scriptorium)
+	extractionOutputs := notariusOutputKeySet(notarius)
+	derived := make([]derivedPublishDestination, 0)
+	for index, output := range cfg.Outputs {
+		if strings.TrimSpace(output.Dest) != "" {
+			continue
+		}
+		dest, err := artifactpolicy.ResolvePublishedDestinationWithExtractions(strings.TrimSpace(output.Source), "", configuredOutputs, extractionOutputs)
+		if err == nil {
+			derived = append(derived, derivedPublishDestination{index: index, dest: dest})
+		}
+	}
+	return derived
+}
+
+func applyMissingPublishDestinations(cfg *PublishConfig, scriptorium *ScriptoriumConfig, notarius *NotariusConfig) {
+	for _, derived := range deriveMissingPublishDestinations(cfg, scriptorium, notarius) {
+		cfg.Outputs[derived.index].Dest = derived.dest
+	}
+}
+
 func validateStorage(cfg StorageConfig) error {
 	backend := strings.ToLower(strings.TrimSpace(cfg.Backend))
 	switch backend {