add: refresh logic for tree

- refactored tree node init
- new function for reset
  - reset filter
  - delete old nodes -> init new nodes
  - TODO: close table view if table was deleted

components/Tree.go

@@ -60,38 +60,7 @@ func NewTree(dbName string, dbdriver drivers.Driver) *Tree {
 	tree.SetCurrentNode(rootNode)
 
 	tree.SetFocusFunc(func() {
-		var databases []string
-
-		if dbName == "" {
-			dbs, err := tree.DBDriver.GetDatabases()
-			if err != nil {
-				panic(err.Error())
-			}
-			databases = dbs
-		} else {
-			databases = []string{dbName}
-		}
-
-		if tree.GetSelectedDatabase() == "" {
-			for _, database := range databases {
-				childNode := tview.NewTreeNode(database)
-				childNode.SetExpanded(false)
-				childNode.SetReference(database)
-				childNode.SetColor(app.Styles.PrimaryTextColor)
-				rootNode.AddChild(childNode)
-
-				go func(database string, node *tview.TreeNode) {
-					tables, err := tree.DBDriver.GetTables(database)
-					if err != nil {
-						logger.Error(err.Error(), nil)
-						return
-					}
-
-					tree.databasesToNodes(tables, node, true)
-					App.Draw()
-				}(database, childNode)
-			}
-		}
+		tree.InitializeNodes(dbName)
 		tree.SetFocusFunc(nil)
 	})
 
@@ -202,6 +171,8 @@ func NewTree(dbName string, dbdriver drivers.Driver) *Tree {
 			tree.CollapseAll()
 		case commands.ExpandAll:
 			tree.ExpandAll()
+		case commands.Refresh:
+			tree.Refresh(dbName)
 		}
 		return nil
 	})
@@ -557,3 +528,65 @@ func (tree *Tree) ExpandAll() {
 		return true
 	})
 }
+
+func (tree *Tree) InitializeNodes(dbName string) {
+	rootNode := tree.GetRoot()
+	if rootNode == nil {
+		panic("Internal Error: No tree root")
+	}
+
+	var databases []string
+
+	if dbName == "" {
+		dbs, err := tree.DBDriver.GetDatabases()
+		if err != nil {
+			panic(err.Error())
+		}
+		databases = dbs
+	} else {
+		databases = []string{dbName}
+	}
+
+	if tree.GetSelectedDatabase() == "" {
+		for _, database := range databases {
+			childNode := tview.NewTreeNode(database)
+			childNode.SetExpanded(false)
+			childNode.SetReference(database)
+			childNode.SetColor(app.Styles.PrimaryTextColor)
+			rootNode.AddChild(childNode)
+
+			go func(database string, node *tview.TreeNode) {
+				tables, err := tree.DBDriver.GetTables(database)
+				if err != nil {
+					logger.Error(err.Error(), nil)
+					return
+				}
+
+				tree.databasesToNodes(tables, node, true)
+				App.Draw()
+			}(database, childNode)
+		}
+	}
+}
+
+func (tree *Tree) Refresh(dbName string) {
+	rootNode := tree.GetRoot()
+	if rootNode == nil {
+		return
+	}
+	// remove existing Children
+	rootNode.ClearChildren()
+	// readd nodes
+	tree.InitializeNodes(dbName)
+	// reset search
+	tree.search("")
+
+	/** TODO:
+	check if the currently opened table was deleted
+	- if deleted
+		- selecedTable and selectedDatabase need to be reset
+		- close Table view
+	- if not
+		- do nothing
+	*/
+}