make more use of generics

pkg/gui/filetree/collapsed_paths.go

@@ -1,20 +1,38 @@
 package filetree
 
-type CollapsedPaths map[string]bool
+import "github.com/jesseduffield/generics/set"
 
-func (cp CollapsedPaths) ExpandToPath(path string) {
+type CollapsedPaths struct {
+	collapsedPaths *set.Set[string]
+}
+
+func NewCollapsedPaths() *CollapsedPaths {
+	return &CollapsedPaths{
+		collapsedPaths: set.New[string](),
+	}
+}
+
+func (self *CollapsedPaths) ExpandToPath(path string) {
 	// need every directory along the way
 	splitPath := split(path)
 	for i := range splitPath {
 		dir := join(splitPath[0 : i+1])
-		cp[dir] = false
+		self.collapsedPaths.Remove(dir)
 	}
 }
 
-func (cp CollapsedPaths) IsCollapsed(path string) bool {
-	return cp[path]
+func (self *CollapsedPaths) IsCollapsed(path string) bool {
+	return self.collapsedPaths.Includes(path)
 }
 
-func (cp CollapsedPaths) ToggleCollapsed(path string) {
-	cp[path] = !cp[path]
+func (self *CollapsedPaths) Collapse(path string) {
+	self.collapsedPaths.Add(path)
+}
+
+func (self *CollapsedPaths) ToggleCollapsed(path string) {
+	if self.collapsedPaths.Includes(path) {
+		self.collapsedPaths.Remove(path)
+	} else {
+		self.collapsedPaths.Add(path)
+	}
 }