Add plugin get command (#217)

* Add plugin get command

Implement 'mcpd config plugins get' command to display top-level plugin config, or config for a specific plugin within a category.

Author: peteski22

cmd/config/plugins/get.go

@@ -5,21 +5,143 @@ import (
 
 	"github.com/spf13/cobra"
 
-	"github.com/mozilla-ai/mcpd/v2/internal/cmd"
-	"github.com/mozilla-ai/mcpd/v2/internal/cmd/options"
+	internalcmd "github.com/mozilla-ai/mcpd/v2/internal/cmd"
+	cmdopts "github.com/mozilla-ai/mcpd/v2/internal/cmd/options"
+	"github.com/mozilla-ai/mcpd/v2/internal/cmd/output"
+	"github.com/mozilla-ai/mcpd/v2/internal/config"
+	"github.com/mozilla-ai/mcpd/v2/internal/printer"
 )
 
+const (
+	flagCategory = "category"
+	flagName     = "name"
+	flagFormat   = "format"
+)
+
+// GetCmd represents the get command.
+// NOTE: Use NewGetCmd to create a GetCmd.
+type GetCmd struct {
+	*internalcmd.BaseCmd
+
+	// cfgLoader is used to load the configuration.
+	cfgLoader config.Loader
+
+	// pluginConfigPrinter is used to output top-level plugin configuration.
+	pluginConfigPrinter output.Printer[printer.PluginConfigResult]
+
+	// pluginEntryPrinter is used to output specific plugin entries.
+	pluginEntryPrinter output.Printer[printer.PluginEntryResult]
+
+	// format stores the format flag when specified.
+	format internalcmd.OutputFormat
+
+	// category is the (optional) category name to look in for the plugin.
+	category config.Category
+
+	// name is the (optional) name of the plugin to return config for.
+	name string
+}
+
 // NewGetCmd creates the get command for plugins.
-// TODO: Implement in a future PR.
-func NewGetCmd(baseCmd *cmd.BaseCmd, opt ...options.CmdOption) (*cobra.Command, error) {
+func NewGetCmd(baseCmd *internalcmd.BaseCmd, opt ...cmdopts.CmdOption) (*cobra.Command, error) {
+	opts, err := cmdopts.NewOptions(opt...)
+	if err != nil {
+		return nil, err
+	}
+
+	c := &GetCmd{
+		BaseCmd:             baseCmd,
+		cfgLoader:           opts.ConfigLoader,
+		pluginConfigPrinter: &printer.PluginConfigPrinter{},
+		pluginEntryPrinter:  &printer.PluginEntryPrinter{},
+		format:              internalcmd.FormatText, // Default to plain text
+	}
+
 	cobraCmd := &cobra.Command{
 		Use:   "get",
-		Short: "Get plugin-level config or specific plugin entry",
-		Long:  "Get plugin-level configuration (when no flags provided) or specific plugin entry (when --category and --name provided)",
-		RunE: func(cmd *cobra.Command, args []string) error {
-			return fmt.Errorf("not yet implemented")
-		},
+		Short: "Get top level configuration for the plugin subsystem or for a specific plugin entry in a category",
+		Long: `Get top level configuration for the plugin subsystem or for a specific plugin entry in a category.
+
+When called without flags, shows plugin-level configuration (e.g. plugin directory).
+When called with --category and --name, shows the specific plugin entry.
+Both --category and --name must be provided together.`,
+		Example: `  # Get plugin-level configuration
+  mcpd config plugins get
+
+  # Get specific plugin entry
+  mcpd config plugins get --category authentication --name jwt-auth`,
+		RunE: c.run,
+		Args: cobra.NoArgs,
 	}
 
+	allowedCategories := config.OrderedCategories()
+	cobraCmd.Flags().Var(
+		&c.category,
+		flagCategory,
+		fmt.Sprintf("Specify the category (one of: %s)", allowedCategories.String()),
+	)
+
+	cobraCmd.Flags().StringVar(
+		&c.name,
+		flagName,
+		"",
+		"Plugin name",
+	)
+
+	allowedOutputFormats := internalcmd.AllowedOutputFormats()
+	cobraCmd.Flags().Var(
+		&c.format,
+		flagFormat,
+		fmt.Sprintf("Specify the output format (one of: %s)", allowedOutputFormats.String()),
+	)
+
 	return cobraCmd, nil
 }
+
+func (c *GetCmd) run(cmd *cobra.Command, _ []string) error {
+	// Validate optional flags.
+	if err := c.RequireTogether(cmd, flagCategory, flagName); err != nil {
+		return err
+	}
+
+	cfg, err := c.LoadConfig(c.cfgLoader)
+	if err != nil {
+		return err
+	}
+
+	// Show top-level plugin config settings.
+	if !cmd.Flags().Changed(flagCategory) {
+		var dir string
+		if cfg.Plugins != nil {
+			dir = cfg.Plugins.Dir
+		}
+
+		result := printer.PluginConfigResult{
+			Dir: dir,
+		}
+
+		handler, err := internalcmd.FormatHandler(cmd.OutOrStdout(), c.format, c.pluginConfigPrinter)
+		if err != nil {
+			return err
+		}
+
+		return handler.HandleResult(result)
+	}
+
+	// Show a single plugin item for category/name if we can find it.
+	if entry, found := cfg.Plugin(c.category, c.name); found {
+		result := printer.PluginEntryResult{
+			PluginEntry: entry,
+			Category:    c.category,
+		}
+
+		handler, err := internalcmd.FormatHandler(cmd.OutOrStdout(), c.format, c.pluginEntryPrinter)
+		if err != nil {
+			return err
+		}
+
+		return handler.HandleResult(result)
+	}
+
+	return fmt.Errorf("plugin '%s' not found in category '%s'", c.name, c.category)
+}