Add boilerplate code for generating a json-formatted registry

Makefile

@@ -25,6 +25,9 @@ registry:
 validate: registry
 	go run cmd/contrib/main.go $@
 
+registry.json: registry
+	go run cmd/contrib/main.go $@
+
 $(plugins_dir):
 	mkdir -p $(plugins_dir)
 	chmod 700 $(plugins_dir)

cmd/contrib/main.go

@@ -77,6 +77,14 @@ func main() {
 		}
 		return
 	}
+
+	if command == "registry.json" {
+		err := generateRegistryJSON()
+		if err != nil {
+			log.Fatal(err)
+		}
+		return
+	}
 }
 
 func isPluginCommand(command string) (isPluginCommand bool, pluginName string, pluginCommand string) {
@@ -620,3 +628,11 @@ func transformCredentialName(ans any) (newAns any) {
 
 	return ans
 }
+
+func generateRegistryJSON() error {
+	b, err := plugins.RegistryJSON()
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join("plugins", "plugins.json"), b, 0600)
+}

plugins/registry.go

@@ -1,14 +1,35 @@
 package plugins
 
 import (
+	"encoding/json"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/1Password/shell-plugins/sdk/schema"
 )
 
 var registry = []schema.Plugin{}
 
+func RegistryJSON() ([]byte, error) {
+	var listToJSON []schema.Plugin
+
+	// Only include plugins that contain at least one credential.
+	for _, p := range List() {
+		if len(p.Credentials) > 0 {
+			listToJSON = append(listToJSON, p)
+		}
+	}
+	timedRegistry := struct {
+		Plugins   []schema.Plugin `json:"registry"`
+		Timestamp time.Time       `json:"timestamp"`
+	}{
+		Plugins:   listToJSON,
+		Timestamp: time.Now(),
+	}
+	return json.MarshalIndent(timedRegistry, "", "\t")
+}
+
 func List() []schema.Plugin {
 	list := make([]schema.Plugin, len(registry))
 	copy(list, registry)

sdk/schema/plugin.go

@@ -1,6 +1,7 @@
 package schema
 
 import (
+	"encoding/json"
 	"fmt"
 	"net/url"
 )
@@ -117,3 +118,23 @@ func (p Plugin) DeepValidate() []ValidationReport {
 
 	return reports
 }
+
+func (p Plugin) MarshalJSON() ([]byte, error) {
+	if len(p.Credentials) == 0 {
+		return nil, nil
+	}
+	plugin := struct {
+		PlatformName  string `json:"platform_name"`
+		ManagementURL string `json:"management_url"`
+	}{
+		PlatformName: p.Platform.Name,
+		ManagementURL: func() string {
+			if p.Credentials[0].ManagementURL != nil {
+				return p.Credentials[0].ManagementURL.String()
+			} else {
+				return ""
+			}
+		}(),
+	}
+	return json.Marshal(plugin)
+}