feat: set default sorting using config option

closes #181

6 files changed, 86 insertions, 3 deletions

diff --git a/README.md b/README.md
index 3b0a6a1..5114342 100644
--- a/README.md
+++ b/README.md
@@ -157,6 +157,14 @@ Gdu can read (and write) YAML configuration file.
 echo "no-color: true" > ~/.gdu.yaml
 ```
 
+* To set default sorting in configuration file:
+
+```
+sorting:
+    by: name // size, name, itemCount, mtime
+    order: desc
+```
+
 * To save the current configuration
 
 ```
diff --git a/cmd/gdu/app/app.go b/cmd/gdu/app/app.go
index f7c0c17..2a34c51 100644
--- a/cmd/gdu/app/app.go
+++ b/cmd/gdu/app/app.go
@@ -62,8 +62,9 @@ type Flags struct {
 	Summarize         bool     `yaml:"summarize"`
 	UseSIPrefix       bool     `yaml:"use-si-prefix"`
 	NoPrefix          bool     `yaml:"no-prefix"`
-	WriteConfig       bool     `yaml:"write-config"`
+	WriteConfig       bool     `yaml:"-"`
 	Style             Style    `yaml:"style"`
+	Sorting           Sorting  `yaml:"sorting"`
 }
 
 // Style define style config
@@ -83,6 +84,12 @@ type ColorStyle struct {
 	BackgroundColor string `yaml:"background-color"`
 }
 
+// Sorting defines default sorting of items
+type Sorting struct {
+	By    string `yaml:"by"`
+	Order string `yaml:"order"`
+}
+
 // App defines the main application
 type App struct {
 	Args        []string
@@ -229,6 +236,11 @@ func (a *App) createUI() (UI, error) {
 				ui.SetCurrentItemNameMaxLen(a.Flags.Style.ProgressModal.CurrentItemNameMaxLen)
 			})
 		}
+		if a.Flags.Sorting.Order != "" || a.Flags.Sorting.By != "" {
+			opts = append(opts, func(ui *tui.UI) {
+				ui.SetDefaultSorting(a.Flags.Sorting.By, a.Flags.Sorting.Order)
+			})
+		}
 
 		ui = tui.CreateUI(
 			a.TermApp,
diff --git a/cmd/gdu/app/app_test.go b/cmd/gdu/app/app_test.go
index cba3829..746550e 100644
--- a/cmd/gdu/app/app_test.go
+++ b/cmd/gdu/app/app_test.go
@@ -134,6 +134,27 @@ func TestAnalyzePathWithGui(t *testing.T) {
 	assert.Nil(t, err)
 }
 
+func TestAnalyzePathWithDefaultSorting(t *testing.T) {
+	fin := testdir.CreateTestDir()
+	defer fin()
+
+	out, err := runApp(
+		&Flags{
+			LogFile: "/dev/null",
+			Sorting: Sorting{
+				By:    "name",
+				Order: "asc",
+			},
+		},
+		[]string{"test_dir"},
+		true,
+		testdev.DevicesInfoGetterMock{},
+	)
+
+	assert.Empty(t, out)
+	assert.Nil(t, err)
+}
+
 func TestAnalyzePathWithStyle(t *testing.T) {
 	fin := testdir.CreateTestDir()
 	defer fin()
diff --git a/tui/sort.go b/tui/sort.go
index 71eea0c..2e2af32 100644
--- a/tui/sort.go
+++ b/tui/sort.go
@@ -7,6 +7,16 @@ import (
 	"github.com/dundee/gdu/v5/pkg/fs"
 )
 
+// SetDefaultSorting sets the default sorting
+func (ui *UI) SetDefaultSorting(by, order string) {
+	if by != "" {
+		ui.defaultSortBy = by
+	}
+	if order == "asc" || order == "desc" {
+		ui.defaultSortOrder = order
+	}
+}
+
 func (ui *UI) setSorting(newOrder string) {
 	if newOrder == ui.sortBy {
 		if ui.sortOrder == "asc" {
diff --git a/tui/sort_test.go b/tui/sort_test.go
index 71b8d74..d0a8528 100644
--- a/tui/sort_test.go
+++ b/tui/sort_test.go
@@ -123,6 +123,34 @@ func TestSetSorting(t *testing.T) {
 	assert.Equal(t, "asc", ui.sortOrder)
 }
 
+func TestSetDEfaultSorting(t *testing.T) {
+	simScreen := testapp.CreateSimScreen(50, 50)
+	defer simScreen.Fini()
+
+	var opts []Option
+	opts = append(opts, func(ui *UI) {
+		ui.SetDefaultSorting("name", "asc")
+	})
+
+	app := testapp.CreateMockedApp(true)
+	ui := CreateUI(app, simScreen, &bytes.Buffer{}, false, false, false, false, false, opts...)
+	ui.Analyzer = &testanalyze.MockedAnalyzer{}
+	ui.done = make(chan struct{})
+
+	if err := ui.AnalyzePath("test_dir", nil); err != nil {
+		panic(err)
+	}
+
+	<-ui.done // wait for analyzer
+
+	for _, f := range ui.app.(*testapp.MockedApp).GetUpdateDraws() {
+		f()
+	}
+
+	assert.Equal(t, "name", ui.sortBy)
+	assert.Equal(t, "asc", ui.sortOrder)
+}
+
 func TestSortDevicesByName(t *testing.T) {
 	app, simScreen := testapp.CreateTestAppWithSimScreen(50, 50)
 	defer simScreen.Fini()
diff --git a/tui/tui.go b/tui/tui.go
index 9cab623..79dda14 100644
--- a/tui/tui.go
+++ b/tui/tui.go
@@ -76,6 +76,8 @@ type UI struct {
 	selectedTextColor       tcell.Color
 	selectedBackgroundColor tcell.Color
 	currentItemNameMaxLen   int
+	defaultSortBy           string
+	defaultSortOrder        string
 }
 
 // Option is optional function customizing the bahaviour of UI
@@ -114,6 +116,8 @@ func CreateUI(
 		selectedTextColor:       tview.Styles.TitleColor,
 		selectedBackgroundColor: tview.Styles.MoreContrastBackgroundColor,
 		currentItemNameMaxLen:   70,
+		defaultSortBy:           "size",
+		defaultSortOrder:        "desc",
 	}
 	for _, o := range opts {
 		o(ui)
@@ -206,8 +210,8 @@ func (ui *UI) StartUILoop() error {
 }
 
 func (ui *UI) resetSorting() {
-	ui.sortBy = "size"
-	ui.sortOrder = "desc"
+	ui.sortBy = ui.defaultSortBy
+	ui.sortOrder = ui.defaultSortOrder
 }
 
 func (ui *UI) rescanDir() {