add Node.Is* predicates to comfortably check node type (#4)

node.go

@@ -6,11 +6,11 @@ import (
 )
 
 const (
-	NodeTypeRoot      = iota + 1 // A root node
+	NodeTypeRoot      = "root"
-	NodeTypeOutput               // An output node
+	NodeTypeOutput    = "output"
-	NodeTypeWorkspace            // A workspace
+	NodeTypeWorkspace = "workspace"
-	NodeTypeCon                  // A container node (containing more nodes)
+	NodeTypeCon       = "con"
-	NodeTypeFloating             // A floating node
+	NodeTypeFloating  = "floating_con"
 )
 
 // Node  can be an output,  a workspace, a container  or a container
@@ -86,6 +86,26 @@ func (node *Node) FindCurrentWorkspace() string {
 	return searchCurrentWorkspace(node.Nodes)
 }
 
+func (node *Node) IsRoot() bool {
+	return node.Type == NodeTypeRoot
+}
+
+func (node *Node) IsOutput() bool {
+	return node.Type == NodeTypeOutput
+}
+
+func (node *Node) IsWorkspace() bool {
+	return node.Type == NodeTypeWorkspace
+}
+
+func (node *Node) IsContainer() bool {
+	return node.Type == NodeTypeCon
+}
+
+func (node *Node) IsFloating() bool {
+	return node.Type == NodeTypeFloating
+}
+
 // searchCurrentWorkspace search for current workspace
 func searchCurrentWorkspace(nodes []*Node) string {
 	for _, node := range nodes {

swayipc.go

@@ -8,7 +8,7 @@ import (
 )
 
 const (
-	VERSION = "v2.1.0"
+	VERSION = "v2.1.1"
 
 	IpcHeaderSize = 14
 	IpcMagix      = "i3-ipc"