feat: Add context deletion functionality (#3489)

* Add delete functionality for Kubernetes contexts

This adds the ability to delete Kubernetes contexts using the 'd' key in the context view. The implementation includes:
- New delete command bound to 'd' key
- Confirmation dialog before deletion
- Error handling and UI refresh after deletion

* Refactor context delete dialog to use standard dialog component

- Replace custom delete confirmation with dialog.ShowConfirm
- Add read-only mode checks for rename and delete commands
- Change delete keybinding from 'd' to 'Ctrl+d'
- Remove unused deletePage constant and related functions
- Simplify delete callback logic

* Refactor context view key bindings to separate dangerous operations

* Fix linting error

internal/view/context.go

@@ -12,6 +12,7 @@ import (
 	"github.com/derailed/k9s/internal/dao"
 	"github.com/derailed/k9s/internal/slogs"
 	"github.com/derailed/k9s/internal/ui"
+	"github.com/derailed/k9s/internal/ui/dialog"
 	"github.com/derailed/k9s/internal/view/cmd"
 	"github.com/derailed/tcell/v2"
 	"github.com/derailed/tview"
@@ -40,7 +41,14 @@ func NewContext(gvr *client.GVR) ResourceViewer {
 
 func (c *Context) bindKeys(aa *ui.KeyActions) {
 	aa.Delete(ui.KeyShiftA, tcell.KeyCtrlSpace, ui.KeySpace)
+	if !c.App().Config.IsReadOnly() {
+		c.bindDangerousKeys(aa)
+	}
+}
+
+func (c *Context) bindDangerousKeys(aa *ui.KeyActions) {
 	aa.Add(ui.KeyR, ui.NewKeyAction("Rename", c.renameCmd, true))
+	aa.Add(tcell.KeyCtrlD, ui.NewKeyAction("Delete", c.deleteCmd, true))
 }
 
 func (c *Context) renameCmd(evt *tcell.EventKey) *tcell.EventKey {
@@ -54,6 +62,24 @@ func (c *Context) renameCmd(evt *tcell.EventKey) *tcell.EventKey {
 	return nil
 }
 
+func (c *Context) deleteCmd(evt *tcell.EventKey) *tcell.EventKey {
+	contextName := c.GetTable().GetSelectedItem()
+	if contextName == "" {
+		return evt
+	}
+
+	d := c.App().Styles.Dialog()
+	dialog.ShowConfirm(&d, c.App().Content.Pages, "Delete", fmt.Sprintf("Delete context %q?", contextName), func() {
+		if err := c.App().factory.Client().Config().DelContext(contextName); err != nil {
+			c.App().Flash().Err(err)
+			return
+		}
+		c.Refresh()
+	}, func() {})
+
+	return nil
+}
+
 func (c *Context) renameDialogCallback(form *tview.Form, contextName string) error {
 	app := c.App()
 	input := form.GetFormItemByLabel(inputField).(*tview.InputField)

internal/view/context_test.go

@@ -17,5 +17,5 @@ func TestContext(t *testing.T) {
 
 	require.NoError(t, ctx.Init(makeCtx(t)))
 	assert.Equal(t, "Contexts", ctx.Name())
-	assert.Len(t, ctx.Hints(), 5)
+	assert.Len(t, ctx.Hints(), 6)
 }