renovate the code, update to go 1.26 and satisfy linter (#3)

node.go

@@ -5,10 +5,18 @@ import (
 	"fmt"
 )
 
-// A node  can be an output,  a workspace, a container  or a container
-// containing a window.
+const (
+	NodeTypeRoot      = iota + 1 // A root node
+	NodeTypeOutput               // An output node
+	NodeTypeWorkspace            // A workspace
+	NodeTypeCon                  // A container node (containing more nodes)
+	NodeTypeFloating             // A floating node
+)
+
+// Node  can be an output,  a workspace, a container  or a container
+// containing other containers.
 type Node struct {
-	Id                 int     `json:"id"`
+	ID                 int     `json:"id"`
 	Type               string  `json:"type"` // output, workspace or container
 	Name               string  `json:"name"` // workspace number or app name
 	Output             string  `json:"output"`
@@ -26,26 +34,24 @@ type Node struct {
 	Focus              []int   `json:"focus"`
 	Window             int     `json:"window"` // wayland native
 	X11Window          string  `json:"app_id"` // x11 compat
-	Current_workspace  string  `json:"current_workspace"`
+	CurrentWorkspace   string  `json:"current_workspace"`
 	Rect               Rect    `json:"rect"`
 	WindowRect         Rect    `json:"window_rect"`
 	DecoRect           Rect    `json:"deco_rect"`
 	Geometry           Rect    `json:"geometry"`
 }
 
-var __focused *Node
-var __currentworkspace string
-
-// Get the whole information tree,  contains everything from output to
-// containers as a tree of nodes.  Each node has a field 'Nodes' which
-// points  to  a   list  subnodes.  Some  nodes  also   have  a  field
-// 'FloatingNodes' which points to a list of floating containers.
+// GetTree  returns   the  whole  information  tree,   which  contains
+// everything from output to containers as a tree of nodes.  Each node
+// has a  field 'Nodes' which points  to a list subnodes.   Some nodes
+// also  have  a field  'FloatingNodes'  which  points  to a  list  of
+// floating containers.
 //
 // The top level node is the "root" node.
 //
 // Use the returned node oject to further investigate the wm setup.
 func (ipc *SwayIPC) GetTree() (*Node, error) {
-	err := ipc.sendHeader(GET_TREE, 0)
+	err := ipc.sendHeader(MsgGettTree, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -63,48 +69,48 @@ func (ipc *SwayIPC) GetTree() (*Node, error) {
 	return node, nil
 }
 
-// Usually called  on the root  node, returns the container  which has
-// currently the focus.
+// FindFocused  returns   the  container   which  has   currently  the
+// focus. Usually called on the root node.
 func (node *Node) FindFocused() *Node {
-	searchFocused(node.Nodes)
-	if __focused == nil {
-		searchFocused(node.FloatingNodes)
+	focused := searchFocused(node.Nodes)
+	if focused == nil {
+		return searchFocused(node.FloatingNodes)
 	}
 
-	return __focused
+	return nil
 }
 
-// internal recursive focus node searcher
-func searchFocused(nodes []*Node) {
+// FindCurrentWorkspace returns  the  current  active
+// workspace name. Usually  called  on  the  root node.
+func (node *Node) FindCurrentWorkspace() string {
+	return searchCurrentWorkspace(node.Nodes)
+}
+
+// searchCurrentWorkspace search for current workspace
+func searchCurrentWorkspace(nodes []*Node) string {
+	for _, node := range nodes {
+		if node.CurrentWorkspace != "" {
+			return node.CurrentWorkspace
+		} else {
+			return searchCurrentWorkspace(node.Nodes)
+		}
+	}
+
+	return ""
+}
+
+// searchFocused recursively search focused node
+func searchFocused(nodes []*Node) *Node {
 	for _, node := range nodes {
 		if node.Focused {
-			__focused = node
-			return
+			return node
 		} else {
-			searchFocused(node.Nodes)
-			if __focused == nil {
-				searchFocused(node.FloatingNodes)
+			focused := searchFocused(node.Nodes)
+			if focused == nil {
+				return searchFocused(node.FloatingNodes)
 			}
 		}
-
 	}
-}
 
-// Usually  called  on  the  root node,  returns  the  current  active
-// workspace name.
-func (node *Node) FindCurrentWorkspace() string {
-	searchCurrentWorkspace(node.Nodes)
-	return __currentworkspace
-}
-
-// internal recursive workspace node searcher
-func searchCurrentWorkspace(nodes []*Node) {
-	for _, node := range nodes {
-		if node.Current_workspace != "" {
-			__currentworkspace = node.Current_workspace
-			return
-		} else {
-			searchCurrentWorkspace(node.Nodes)
-		}
-	}
+	return nil
 }