make more use of generics

52 files changed, 3014 insertions, 275 deletions

diff --git a/go.mod b/go.mod
index 3e7598384..afdf377ed 100644
--- a/go.mod
+++ b/go.mod
@@ -14,6 +14,7 @@ require (
 	github.com/gookit/color v1.4.2
 	github.com/imdario/mergo v0.3.11
 	github.com/integrii/flaggy v1.4.0
+	github.com/jesseduffield/generics v0.0.0-20220318214805-3397e5e19e9f
 	github.com/jesseduffield/go-git/v5 v5.1.2-0.20201006095850-341962be15a4
 	github.com/jesseduffield/gocui v0.3.1-0.20220227022729-69f0c798eec8
 	github.com/jesseduffield/minimal/gitignore v0.3.3-0.20211018110810-9cde264e6b1e
@@ -25,6 +26,7 @@ require (
 	github.com/mgutz/str v1.2.0
 	github.com/pmezard/go-difflib v1.0.0
 	github.com/sahilm/fuzzy v0.1.0
+	github.com/samber/lo v1.10.1
 	github.com/sanity-io/litter v1.5.2
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spkg/bom v0.0.0-20160624110644-59b7046e48ad
diff --git a/go.sum b/go.sum
index fc2d2400d..c06b0aef1 100644
--- a/go.sum
+++ b/go.sum
@@ -66,6 +66,8 @@ github.com/integrii/flaggy v1.4.0 h1:A1x7SYx4jqu5NSrY14z8Z+0UyX2S5ygfJJrfolWR3zM
 github.com/integrii/flaggy v1.4.0/go.mod h1:tnTxHeTJbah0gQ6/K0RW0J7fMUBk9MCF5blhm43LNpI=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
+github.com/jesseduffield/generics v0.0.0-20220318214805-3397e5e19e9f h1:9USuZttmg5ioHsjFyXboiGSbncpAqcKkq9qb4ga5PD0=
+github.com/jesseduffield/generics v0.0.0-20220318214805-3397e5e19e9f/go.mod h1:+LLj9/WUPAP8LqCchs7P+7X0R98HiFujVFANdNaxhGk=
 github.com/jesseduffield/go-git/v5 v5.1.2-0.20201006095850-341962be15a4 h1:GOQrmaE8i+KEdB8NzAegKYd4tPn/inM0I1uo0NXFerg=
 github.com/jesseduffield/go-git/v5 v5.1.2-0.20201006095850-341962be15a4/go.mod h1:nGNEErzf+NRznT+N2SWqmHnDnF9aLgANB1CUNEan09o=
 github.com/jesseduffield/gocui v0.3.1-0.20220227022729-69f0c798eec8 h1:9N08i5kjvOfkzMj6THmIM110wPTQLdVYEOHMHT2DFiI=
@@ -129,6 +131,8 @@ github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/sahilm/fuzzy v0.1.0 h1:FzWGaw2Opqyu+794ZQ9SYifWv2EIXpwP4q8dY1kDAwI=
 github.com/sahilm/fuzzy v0.1.0/go.mod h1:VFvziUEIMCrT6A6tw2RFIXPXXmzXbOsSHF0DOI8ZK9Y=
+github.com/samber/lo v1.10.1 h1:0D3h7i0U3hRAbaCeQ82DLe67n0A7Bbl0/cEoWqFGp+U=
+github.com/samber/lo v1.10.1/go.mod h1:2I7tgIv8Q1SG2xEIkRq0F2i2zgxVpnyPOP0d3Gj2r+A=
 github.com/sanity-io/litter v1.5.2 h1:AnC8s9BMORWH5a4atZ4D6FPVvKGzHcnc5/IVTa87myw=
 github.com/sanity-io/litter v1.5.2/go.mod h1:5Z71SvaYy5kcGtyglXOC9rrUi3c1E8CamFWjQsazTh0=
 github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
@@ -146,6 +150,7 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/thoas/go-funk v0.9.1 h1:O549iLZqPpTUQ10ykd26sZhzD+rmR5pWhuElrhbC20M=
 github.com/urfave/cli v1.20.1-0.20180226030253-8e01ec4cd3e2/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/xanzy/ssh-agent v0.2.1 h1:TCbipTQL2JiiCprBWx9frJ2eJlCYT00NmctrHxVAr70=
 github.com/xanzy/ssh-agent v0.2.1/go.mod h1:mLlQY/MoOhWBj+gOGMQkOeiEvkx+8pJSI+0Bx9h2kr4=
diff --git a/pkg/commands/git_commands/rebase_test.go b/pkg/commands/git_commands/rebase_test.go
index 56df77a86..4e7b5c2c6 100644
--- a/pkg/commands/git_commands/rebase_test.go
+++ b/pkg/commands/git_commands/rebase_test.go
@@ -8,7 +8,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/commands/git_config"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
-	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -64,7 +64,7 @@ func TestRebaseSkipEditorCommand(t *testing.T) {
 			"^LAZYGIT_CLIENT_COMMAND=EXIT_IMMEDIATELY$",
 		} {
 			regexStr := regexStr
-			foundMatch := utils.IncludesStringFunc(envVars, func(envVar string) bool {
+			foundMatch := lo.ContainsBy(envVars, func(envVar string) bool {
 				return regexp.MustCompile(regexStr).MatchString(envVar)
 			})
 			if !foundMatch {
diff --git a/pkg/commands/loaders/branches.go b/pkg/commands/loaders/branches.go
index 1f78908a8..9fa1e80f4 100644
--- a/pkg/commands/loaders/branches.go
+++ b/pkg/commands/loaders/branches.go
@@ -4,6 +4,7 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/jesseduffield/generics/set"
 	"github.com/jesseduffield/go-git/v5/config"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/common"
@@ -181,15 +182,15 @@ func (self *BranchLoader) obtainBranches() []*models.Branch {
 // TODO: only look at the new reflog commits, and otherwise store the recencies in
 // int form against the branch to recalculate the time ago
 func (self *BranchLoader) obtainReflogBranches(reflogCommits []*models.Commit) []*models.Branch {
-	foundBranchesMap := map[string]bool{}
+	foundBranches := set.New[string]()
 	re := regexp.MustCompile(`checkout: moving from ([\S]+) to ([\S]+)`)
 	reflogBranches := make([]*models.Branch, 0, len(reflogCommits))
 	for _, commit := range reflogCommits {
 		if match := re.FindStringSubmatch(commit.Name); len(match) == 3 {
 			recency := utils.UnixToTimeAgo(commit.UnixTimestamp)
 			for _, branchName := range match[1:] {
-				if !foundBranchesMap[branchName] {
-					foundBranchesMap[branchName] = true
+				if !foundBranches.Includes(branchName) {
+					foundBranches.Add(branchName)
 					reflogBranches = append(reflogBranches, &models.Branch{
 						Recency: recency,
 						Name:    branchName,
diff --git a/pkg/commands/loaders/files.go b/pkg/commands/loaders/files.go
index f5becdb92..8ab727453 100644
--- a/pkg/commands/loaders/files.go
+++ b/pkg/commands/loaders/files.go
@@ -7,7 +7,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
 	"github.com/jesseduffield/lazygit/pkg/common"
-	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 )
 
 type FileLoaderConfig interface {
@@ -57,10 +57,10 @@ func (self *FileLoader) GetStatusFiles(opts GetStatusFileOptions) []*models.File
 		change := status.Change
 		stagedChange := change[0:1]
 		unstagedChange := change[1:2]
-		untracked := utils.IncludesString([]string{"??", "A ", "AM"}, change)
-		hasNoStagedChanges := utils.IncludesString([]string{" ", "U", "?"}, stagedChange)
-		hasInlineMergeConflicts := utils.IncludesString([]string{"UU", "AA"}, change)
-		hasMergeConflicts := hasInlineMergeConflicts || utils.IncludesString([]string{"DD", "AU", "UA", "UD", "DU"}, change)
+		untracked := lo.Contains([]string{"??", "A ", "AM"}, change)
+		hasNoStagedChanges := lo.Contains([]string{" ", "U", "?"}, stagedChange)
+		hasInlineMergeConflicts := lo.Contains([]string{"UU", "AA"}, change)
+		hasMergeConflicts := hasInlineMergeConflicts || lo.Contains([]string{"DD", "AU", "UA", "UD", "DU"}, change)
 
 		file := &models.File{
 			Name:                    status.Name,
diff --git a/pkg/commands/patch/hunk.go b/pkg/commands/patch/hunk.go
index bbb2d54ff..98d932126 100644
--- a/pkg/commands/patch/hunk.go
+++ b/pkg/commands/patch/hunk.go
@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 )
 
 type PatchHunk struct {
@@ -54,7 +55,7 @@ func (hunk *PatchHunk) updatedLines(lineIndices []int, reverse bool) []string {
 		if line == "" {
 			break
 		}
-		isLineSelected := utils.IncludesInt(lineIndices, lineIdx)
+		isLineSelected := lo.Contains(lineIndices, lineIdx)
 
 		firstChar, content := line[:1], line[1:]
 		transformedFirstChar := transformedFirstChar(firstChar, reverse, isLineSelected)
diff --git a/pkg/commands/patch/patch_manager.go b/pkg/commands/patch/patch_manager.go
index cbdf7b2d4..1282356f8 100644
--- a/pkg/commands/patch/patch_manager.go
+++ b/pkg/commands/patch/patch_manager.go
@@ -4,7 +4,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 	"github.com/sirupsen/logrus"
 )
 
@@ -140,7 +140,7 @@ func (p *PatchManager) AddFileLineRange(filename string, firstLineIdx, lastLineI
 		return err
 	}
 	info.mode = PART
-	info.includedLineIndices = utils.UnionInt(info.includedLineIndices, getIndicesForRange(firstLineIdx, lastLineIdx))
+	info.includedLineIndices = lo.Union(info.includedLineIndices, getIndicesForRange(firstLineIdx, lastLineIdx))
 
 	return nil
 }
@@ -151,7 +151,7 @@ func (p *PatchManager) RemoveFileLineRange(filename string, firstLineIdx, lastLi
 		return err
 	}
 	info.mode = PART
-	info.includedLineIndices = utils.DifferenceInt(info.includedLineIndices, getIndicesForRange(firstLineIdx, lastLineIdx))
+	info.includedLineIndices, _ = lo.Difference(info.includedLineIndices, getIndicesForRange(firstLineIdx, lastLineIdx))
 	if len(info.includedLineIndices) == 0 {
 		p.removeFile(info)
 	}
diff --git a/pkg/commands/patch/patch_parser.go b/pkg/commands/patch/patch_parser.go
index c2be120c9..3810d8a29 100644
--- a/pkg/commands/patch/patch_parser.go
+++ b/pkg/commands/patch/patch_parser.go
@@ -7,6 +7,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/gui/style"
 	"github.com/jesseduffield/lazygit/pkg/theme"
 	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 	"github.com/sirupsen/logrus"
 )
 
@@ -186,7 +187,7 @@ func (p *PatchParser) Render(firstLineIndex int, lastLineIndex int, incLineIndic
 	renderedLines := make([]string, len(p.PatchLines))
 	for index, patchLine := range p.PatchLines {
 		selected := index >= firstLineIndex && index <= lastLineIndex
-		included := utils.IncludesInt(incLineIndices, index)
+		included := lo.Contains(incLineIndices, index)
 		renderedLines[index] = patchLine.render(selected, included)
 	}
 	result := strings.Join(renderedLines, "\n")
diff --git a/pkg/gui/controllers/global_controller.go b/pkg/gui/controllers/global_controller.go
index 487c1e10b..c45e98d85 100644
--- a/pkg/gui/controllers/global_controller.go
+++ b/pkg/gui/controllers/global_controller.go
@@ -1,9 +1,11 @@
 package controllers
 
 import (
+	"github.com/jesseduffield/generics/list"
 	"github.com/jesseduffield/lazygit/pkg/gui/controllers/helpers"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
 	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 )
 
 type GlobalController struct {
@@ -36,9 +38,7 @@ func (self *GlobalController) customCommand() error {
 		FindSuggestionsFunc: self.GetCustomCommandsHistorySuggestionsFunc(),
 		HandleConfirm: func(command string) error {
 			self.c.GetAppState().CustomCommandsHistory = utils.Limit(
-				utils.Uniq(
-					append(self.c.GetAppState().CustomCommandsHistory, command),
-				),
+				lo.Uniq(append(self.c.GetAppState().CustomCommandsHistory, command)),
 				1000,
 			)
 
@@ -57,7 +57,7 @@ func (self *GlobalController) customCommand() error {
 
 func (self *GlobalController) GetCustomCommandsHistorySuggestionsFunc() func(string) []*types.Suggestion {
 	// reversing so that we display the latest command first
-	history := utils.Reverse(self.c.GetAppState().CustomCommandsHistory)
+	history := list.Reverse(self.c.GetAppState().CustomCommandsHistory)
 
 	return helpers.FuzzySearchFunc(history)
 }
diff --git a/pkg/gui/controllers/helpers/cherry_pick_helper.go b/pkg/gui/controllers/helpers/cherry_pick_helper.go
index badbf0dfe..e4a9b3e81 100644
--- a/pkg/gui/controllers/helpers/cherry_pick_helper.go
+++ b/pkg/gui/controllers/helpers/cherry_pick_helper.go
@@ -1,11 +1,13 @@
 package helpers
 
 import (
+	"github.com/jesseduffield/generics/set"
 	"github.com/jesseduffield/lazygit/pkg/commands"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/gui/context"
 	"github.com/jesseduffield/lazygit/pkg/gui/modes/cherrypicking"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
+	"github.com/samber/lo"
 )
 
 type CherryPickHelper struct {
@@ -63,13 +65,13 @@ func (self *CherryPickHelper) CopyRange(selectedIndex int, commitsList []*models
 		return err
 	}
 
-	commitShaMap := self.CherryPickedCommitShaMap()
+	commitSet := self.CherryPickedCommitShaSet()
 
 	// find the last commit that is copied that's above our position
 	// if there are none, startIndex = 0
 	startIndex := 0
 	for index, commit := range commitsList[0:selectedIndex] {
-		if commitShaMap[commit.Sha] {
+		if commitSet.Includes(commit.Sha) {
 			startIndex = index
 		}
 	}
@@ -105,25 +107,23 @@ func (self *CherryPickHelper) Reset() error {
 	return self.rerender()
 }
 
-func (self *CherryPickHelper) CherryPickedCommitShaMap() map[string]bool {
-	commitShaMap := map[string]bool{}
-	for _, commit := range self.getData().CherryPickedCommits {
-		commitShaMap[commit.Sha] = true
-	}
-	return commitShaMap
+func (self *CherryPickHelper) CherryPickedCommitShaSet() *set.Set[string] {
+	shas := lo.Map(self.getData().CherryPickedCommits, func(commit *models.Commit, _ int) string {
+		return commit.Sha
+	})
+	return set.NewFromSlice(shas)
 }
 
 func (self *CherryPickHelper) add(selectedCommit *models.Commit, commitsList []*models.Commit) {
-	commitShaMap := self.CherryPickedCommitShaMap()
-	commitShaMap[selectedCommit.Sha] = true
-
-	newCommits := []*models.Commit{}
-	for _, commit := range commitsList {
-		if commitShaMap[commit.Sha] {
-			// duplicating just the things we need to put in the rebase TODO list
-			newCommits = append(newCommits, &models.Commit{Name: commit.Name, Sha: commit.Sha})
-		}
-	}
+	commitSet := self.CherryPickedCommitShaSet()
+	commitSet.Add(selectedCommit.Sha)
+
+	commitsInSet := lo.Filter(commitsList, func(commit *models.Commit, _ int) bool {
+		return commitSet.Includes(commit.Sha)
+	})
+	newCommits := lo.Map(commitsInSet, func(commit *models.Commit, _ int) *models.Commit {
+		return &models.Commit{Name: commit.Name, Sha: commit.Sha}
+	})
 
 	self.getData().CherryPickedCommits = newCommits
 }
diff --git a/pkg/gui/filetree/collapsed_paths.go b/pkg/gui/filetree/collapsed_paths.go
index 02c0b4303..903999b37 100644
--- a/pkg/gui/filetree/collapsed_paths.go
+++ b/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 (self *CollapsedPaths) Collapse(path string) {
+	self.collapsedPaths.Add(path)
 }
 
-func (cp CollapsedPaths) ToggleCollapsed(path string) {
-	cp[path] = !cp[path]
+func (self *CollapsedPaths) ToggleCollapsed(path string) {
+	if self.collapsedPaths.Includes(path) {
+		self.collapsedPaths.Remove(path)
+	} else {
+		self.collapsedPaths.Add(path)
+	}
 }
diff --git a/pkg/gui/filetree/commit_file_node.go b/pkg/gui/filetree/commit_file_node.go
index a8f7d0a95..ac2057da5 100644
--- a/pkg/gui/filetree/commit_file_node.go
+++ b/pkg/gui/filetree/commit_file_node.go
@@ -100,7 +100,7 @@ func (s *CommitFileNode) EveryFile(test func(file *models.CommitFile) bool) bool
 	})
 }
 
-func (n *CommitFileNode) Flatten(collapsedPaths map[string]bool) []*CommitFileNode {
+func (n *CommitFileNode) Flatten(collapsedPaths *CollapsedPaths) []*CommitFileNode {
 	results := flatten(n, collapsedPaths)
 	nodes := make([]*CommitFileNode, len(results))
 	for i, result := range results {
@@ -110,7 +110,7 @@ func (n *CommitFileNode) Flatten(collapsedPaths map[string]bool) []*CommitFileNo
 	return nodes
 }
 
-func (node *CommitFileNode) GetNodeAtIndex(index int, collapsedPaths map[string]bool) *CommitFileNode {
+func (node *CommitFileNode) GetNodeAtIndex(index int, collapsedPaths *CollapsedPaths) *CommitFileNode {
 	if node == nil {
 		return nil
 	}
@@ -124,11 +124,11 @@ func (node *CommitFileNode) GetNodeAtIndex(index int, collapsedPaths map[string]
 	return result.(*CommitFileNode)
 }
 
-func (node *CommitFileNode) GetIndexForPath(path string, collapsedPaths map[string]bool) (int, bool) {
+func (node *CommitFileNode) GetIndexForPath(path string, collapsedPaths *CollapsedPaths) (int, bool) {
 	return getIndexForPath(node, path, collapsedPaths)
 }
 
-func (node *CommitFileNode) Size(collapsedPaths map[string]bool) int {
+func (node *CommitFileNode) Size(collapsedPaths *CollapsedPaths) int {
 	if node == nil {
 		return 0
 	}
diff --git a/pkg/gui/filetree/commit_file_tree.go b/pkg/gui/filetree/commit_file_tree.go
index 055e273f3..e539c9dea 100644
--- a/pkg/gui/filetree/commit_file_tree.go
+++ b/pkg/gui/filetree/commit_file_tree.go
@@ -19,7 +19,7 @@ type CommitFileTree struct {
 	tree           *CommitFileNode
 	showTree       bool
 	log            *logrus.Entry
-	collapsedPaths CollapsedPaths
+	collapsedPaths *CollapsedPaths
 }
 
 var _ ICommitFileTree = &CommitFileTree{}
@@ -29,7 +29,7 @@ func NewCommitFileTree(getFiles func() []*models.CommitFile, log *logrus.Entry,
 		getFiles:       getFiles,
 		log:            log,
 		showTree:       showTree,
-		collapsedPaths: CollapsedPaths{},
+		collapsedPaths: NewCollapsedPaths(),
 	}
 }
 
@@ -88,7 +88,7 @@ func (self *CommitFileTree) Tree() INode {
 	return self.tree
 }
 
-func (self *CommitFileTree) CollapsedPaths() CollapsedPaths {
+func (self *CommitFileTree) CollapsedPaths() *CollapsedPaths {
 	return self.collapsedPaths
 }
 
diff --git a/pkg/gui/filetree/file_node.go b/pkg/gui/filetree/file_node.go
index 841f723fc..e73504321 100644
--- a/pkg/gui/filetree/file_node.go
+++ b/pkg/gui/filetree/file_node.go
@@ -87,7 +87,7 @@ func (s *FileNode) Any(test func(node *FileNode) bool) bool {
 	})
 }
 
-func (n *FileNode) Flatten(collapsedPaths map[string]bool) []*FileNode {
+func (n *FileNode) Flatten(collapsedPaths *CollapsedPaths) []*FileNode {
 	results := flatten(n, collapsedPaths)
 	nodes := make([]*FileNode, len(results))
 	for i, result := range results {
@@ -97,7 +97,7 @@ func (n *FileNode) Flatten(collapsedPaths map[string]bool) []*FileNode {
 	return nodes
 }
 
-func (node *FileNode) GetNodeAtIndex(index int, collapsedPaths map[string]bool) *FileNode {
+func (node *FileNode) GetNodeAtIndex(index int, collapsedPaths *CollapsedPaths) *FileNode {
 	if node == nil {
 		return nil
 	}
@@ -111,11 +111,11 @@ func (node *FileNode) GetNodeAtIndex(index int, collapsedPaths map[string]bool)
 	return result.(*FileNode)
 }
 
-func (node *FileNode) GetIndexForPath(path string, collapsedPaths map[string]bool) (int, bool) {
+func (node *FileNode) GetIndexForPath(path str