ssm-browse: added cd command

Also came up with an approach for dealing with commands that will probably work with contexts

internal/ssm-browse/controllers/events.go

@@ -3,5 +3,6 @@ package controllers
 import "github.com/lmika/awstools/internal/ssm-browse/models"
 
 type NewParameterListMsg struct {
+	Prefix string
 	Parameters *models.SSMParameters
 }

internal/ssm-browse/controllers/ssmcontroller.go

@@ -5,27 +5,53 @@ import (
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/lmika/awstools/internal/common/ui/events"
 	"github.com/lmika/awstools/internal/ssm-browse/services/ssmparameters"
+	"sync"
 )
 
 type SSMController struct {
 	service *ssmparameters.Service
+
+	// state
+	mutex *sync.Mutex
+	prefix string
 }
 
 func New(service *ssmparameters.Service) *SSMController {
 	return &SSMController{
 		service: service,
+		prefix: "/",
+		mutex: new(sync.Mutex),
 	}
 }
 
 func (c *SSMController) Fetch() tea.Cmd {
 	return func() tea.Msg {
-		res, err := c.service.List(context.Background())
+		res, err := c.service.List(context.Background(), c.prefix)
 		if err != nil {
 			return events.Error(err)
 		}
 
 		return NewParameterListMsg{
+			Prefix: c.prefix,
 			Parameters: res,
 		}
 	}
 }
+
+func (c *SSMController) ChangePrefix(newPrefix string) tea.Cmd {
+	return func() tea.Msg {
+		res, err := c.service.List(context.Background(), newPrefix)
+		if err != nil {
+			return events.Error(err)
+		}
+
+		c.mutex.Lock()
+		defer c.mutex.Unlock()
+		c.prefix = newPrefix
+
+		return NewParameterListMsg{
+			Prefix: c.prefix,
+			Parameters: res,
+		}
+	}
+}