feat: add --no-delete option, resolves #224

cmd/gdu/app/app.go

@@ -63,6 +63,7 @@
 	NoProgress         bool     `yaml:"no-progress"`
 	NoCross            bool     `yaml:"no-cross"`
 	NoHidden           bool     `yaml:"no-hidden"`
+	NoDelete           bool     `yaml:"no-delete"`
 	FollowSymlinks     bool     `yaml:"follow-symlinks"`
 	Profiling          bool     `yaml:"profiling"`
 	ConstGC            bool     `yaml:"const-gc"`
@@ -274,6 +275,11 @@
 				ui.SetShowItemCount()
 			})
 		}
+		if a.Flags.NoDelete {
+			opts = append(opts, func(ui *tui.UI) {
+				ui.SetNoDelete()
+			})
+		}
 
 		ui = tui.CreateUI(
 			a.TermApp,

cmd/gdu/main.go

@@ -73,6 +73,7 @@ func init() {
 	flags.BoolVar(&af.UseSIPrefix, "si", false, "Show sizes with decimal SI prefixes (kB, MB, GB) instead of binary prefixes (KiB, MiB, GiB)")
 	flags.BoolVar(&af.NoPrefix, "no-prefix", false, "Show sizes as raw numbers without any prefixes (SI or binary) in non-interactive mode")
 	flags.BoolVar(&af.NoMouse, "no-mouse", false, "Do not use mouse")
+	flags.BoolVar(&af.NoDelete, "no-delete", false, "Do not allow deletions")
 	flags.BoolVar(&af.WriteConfig, "write-config", false, "Write current configuration to file (default is $HOME/.gdu.yaml)")
 
 	initConfig()

tui/keys_test.go

@@ -400,6 +400,36 @@ func TestDelete(t *testing.T) {
 	assert.NoDirExists(t, "test_dir/nested")
 }
 
+func TestDeleteWithNoDelete(t *testing.T) {
+	fin := testdir.CreateTestDir()
+	defer fin()
+	simScreen := testapp.CreateSimScreen()
+	defer simScreen.Fini()
+
+	app := testapp.CreateMockedApp(true)
+	ui := CreateUI(app, simScreen, &bytes.Buffer{}, false, true, false, false, false)
+	ui.done = make(chan struct{})
+	err := ui.AnalyzePath("test_dir", nil)
+	assert.Nil(t, err)
+
+	<-ui.done // wait for analyzer
+
+	for _, f := range ui.app.(*testapp.MockedApp).GetUpdateDraws() {
+		f()
+	}
+
+	assert.Equal(t, "test_dir", ui.currentDir.GetName())
+
+	assert.Equal(t, 1, ui.table.GetRowCount())
+
+	ui.table.Select(0, 0)
+
+	ui.SetNoDelete()
+	ui.keyPressed(tcell.NewEventKey(tcell.KeyRune, 'd', 0))
+
+	assert.DirExists(t, "test_dir/nested")
+}
+
 func TestDeleteMarked(t *testing.T) {
 	fin := testdir.CreateTestDir()
 	defer fin()

tui/show.go

@@ -250,19 +250,10 @@
 	text.SetTitle(" gdu help ")
 	text.SetScrollable(true)
 
-	if ui.UseColors {
-		text.SetText(
-			strings.ReplaceAll(
-				strings.ReplaceAll(helpText, "[::b]", "[red]"),
-				"[white:black:-]",
-				"[white]",
-			),
-		)
-	} else {
-		text.SetText(helpText)
-	}
+	formattedHelpText := ui.formatHelpTextFor()
+	text.SetText(formattedHelpText)
 
-	maxHeight := strings.Count(helpText, "\n") + 7
+	maxHeight := strings.Count(formattedHelpText, "\n") + 7
 	_, height := ui.screen.Size()
 	if height > maxHeight {
 		height = maxHeight
@@ -280,3 +271,24 @@
 	ui.pages.AddPage("help", flex, true, true)
 	ui.app.SetFocus(text)
 }
+
+func (ui *UI) formatHelpTextFor() string {
+	lines := strings.Split(helpText, "\n")
+
+	for i, line := range lines {
+		if ui.UseColors {
+			lines[i] = strings.ReplaceAll(
+				strings.ReplaceAll(line, "[::b]", "[red]"),
+				"[white:black:-]",
+				"[white]",
+			)
+		}
+
+		if ui.noDelete && (strings.Contains(line, "Empty file or directory") ||
+			strings.Contains(line, "Delete file or directory")) {
+			lines[i] += " (disabled)"
+		}
+	}
+
+	return strings.Join(lines, "\n")
+}

tui/tui.go

@@ -2,6 +2,7 @@
 
 import (
 	"io"
+	"time"
 
 	"golang.org/x/exp/slices"
 
@@ -57,6 +58,7 @@
 	defaultSortOrder        string
 	markedRows              map[int]struct{}
 	exportName              string
+	noDelete                bool
 }
 
 // Option is optional function customizing the bahaviour of UI
@@ -99,6 +101,7 @@
 		defaultSortOrder:        "desc",
 		markedRows:              make(map[int]struct{}),
 		exportName:              "export.json",
+		noDelete:                false,
 	}
 	for _, o := range opts {
 		o(ui)
@@ -205,6 +208,10 @@
 	ui.showItemCount = true
 }
 
+func (ui *UI) SetNoDelete() {
+	ui.noDelete = true
+}
+
 func (ui *UI) resetSorting() {
 	ui.sortBy = ui.defaultSortBy
 	ui.sortOrder = ui.defaultSortOrder
@@ -280,6 +287,23 @@
 }
 
 func (ui *UI) confirmDeletion(shouldEmpty bool) {
+	if ui.noDelete {
+		previousHeaderText := ui.header.GetText(false)
+
+		// show feedback to user
+		ui.header.SetText(" Deletion is disabled!")
+
+		go func() {
+			time.Sleep(2 * time.Second)
+			ui.app.QueueUpdateDraw(func() {
+				ui.header.Clear()
+				ui.header.SetText(previousHeaderText)
+			})
+		}()
+
+		return
+	}
+
 	if len(ui.markedRows) > 0 {
 		ui.confirmDeletionMarked(shouldEmpty)
 	} else {

tui/tui_test.go

@@ -464,6 +464,18 @@ func TestSetShowItemCount(t *testing.T) {
 	assert.Equal(t, ui.showItemCount, true)
 }
 
+func TestNoDelete(t *testing.T) {
+	simScreen := testapp.CreateSimScreen()
+	defer simScreen.Fini()
+
+	app := testapp.CreateMockedApp(true)
+	ui := CreateUI(app, simScreen, &bytes.Buffer{}, false, true, false, false, false)
+
+	ui.SetNoDelete()
+
+	assert.Equal(t, ui.noDelete, true)
+}
+
 // nolint: deadcode,unused // Why: for debugging
 func printScreen(simScreen tcell.SimulationScreen) {
 	b, _, _ := simScreen.GetContents()