add get-dirsize command (#750)

complete.go

@@ -60,6 +60,7 @@ var (
 		"echomsg",
 		"echoerr",
 		"cd",
+		"get-dirsize",
 		"select",
 		"glob-select",
 		"glob-unselect",

doc.go

@@ -31,6 +31,7 @@ The following commands are provided by lf:
     unselect                 (default 'u')
     glob-select
     glob-unselect
+    get-dirsize
     copy                     (default 'y')
     cut                      (default 'd')
     paste                    (default 'p')
@@ -274,6 +275,10 @@ Select files that match the given glob.
 
 Unselect files that match the given glob.
 
+    get-dirsize
+
+Get the total size for each of the selected directories.
+
     copy                     (default 'y')
 
 If there are no selections, save the path of the current file to the copy buffer, otherwise, copy the paths of selected files.

docstring.go

@@ -35,6 +35,7 @@ The following commands are provided by lf:
     unselect                 (default 'u')
     glob-select
     glob-unselect
+    get-dirsize
     copy                     (default 'y')
     cut                      (default 'd')
     paste                    (default 'p')
@@ -286,6 +287,10 @@ Select files that match the given glob.
 
 Unselect files that match the given glob.
 
+    get-dirsize
+
+Get the total size for each of the selected directories.
+
     copy                     (default 'y')
 
 If there are no selections, save the path of the current file to the copy

eval.go

@@ -913,6 +913,15 @@ func (e *callExpr) eval(app *app, args []string) {
 		app.nav.invert()
 	case "unselect":
 		app.nav.unselect()
+	case "get-dirsize":
+		err := app.nav.getDirSize()
+		if err != nil {
+			app.ui.echoerrf("get-dirsize: %s", err)
+			return
+		}
+		app.ui.loadFileInfo(app.nav)
+		app.nav.sort()
+		app.ui.sort()
 	case "copy":
 		if err := app.nav.save(true); err != nil {
 			app.ui.echoerrf("copy: %s", err)

lf.1

@@ -47,6 +47,7 @@ The following commands are provided by lf:
     unselect                 (default 'u')
     glob-select
     glob-unselect
+    get-dirsize
     copy                     (default 'y')
     cut                      (default 'd')
     paste                    (default 'p')
@@ -320,6 +321,12 @@ Select files that match the given glob.
 .PP
 Unselect files that match the given glob.
 .PP
+.EX
+    get-dirsize
+.EE
+.PP
+Get the total size for each of the selected directories.
+.PP
 .EX
     copy                     (default 'y')
 .EE

nav.go

@@ -32,11 +32,22 @@ type file struct {
 	linkTarget string
 	path       string
 	dirCount   int
+	dirSize    int64
 	accessTime time.Time
 	changeTime time.Time
 	ext        string
 }
 
+func (file *file) TotalSize() int64 {
+	if file.IsDir() {
+		if file.dirSize >= 0 {
+			return file.dirSize
+		}
+		return 0
+	}
+	return file.Size()
+}
+
 func readdir(path string) ([]*file, error) {
 	f, err := os.Open(path)
 	if err != nil {
@@ -95,6 +106,7 @@ func readdir(path string) ([]*file, error) {
 			linkTarget: linkTarget,
 			path:       fpath,
 			dirCount:   -1,
+			dirSize:    -1,
 			accessTime: at,
 			changeTime: ct,
 			ext:        ext,
@@ -172,7 +184,7 @@ func (dir *dir) sort() {
 		})
 	case sizeSort:
 		sort.SliceStable(dir.files, func(i, j int) bool {
-			return dir.files[i].Size() < dir.files[j].Size()
+			return dir.files[i].TotalSize() < dir.files[j].TotalSize()
 		})
 	case timeSort:
 		sort.SliceStable(dir.files, func(i, j int) bool {
@@ -1487,3 +1499,45 @@ func (nav *nav) currFileOrSelections() (list []string, err error) {
 
 	return nav.currSelections(), nil
 }
+
+func (nav *nav) getDirSize() error {
+
+	calc := func(f *file) error {
+		if f.IsDir() {
+			total, err := copySize([]string{f.path})
+			if err != nil {
+				return err
+			}
+			f.dirSize = total
+		}
+		return nil
+	}
+
+	if len(nav.selections) == 0 {
+		curr, err := nav.currFile()
+		if err != nil {
+			return errors.New("no file selected")
+		}
+		return calc(curr)
+	} else {
+		for sel, _ := range nav.selections {
+			lstat, err := os.Lstat(sel)
+			if err != nil || !lstat.IsDir() {
+				continue
+			}
+			path, name := filepath.Dir(sel), filepath.Base(sel)
+			dir := nav.loadDir(path)
+
+			for _, f := range dir.files {
+				if f.Name() == name {
+					err := calc(f)
+					if err != nil {
+						return err
+					}
+					break
+				}
+			}
+		}
+	}
+	return nil
+}

ui.go

@@ -292,8 +292,14 @@ func fileInfo(f *file, d *dir) string {
 	for _, s := range gOpts.info {
 		switch s {
 		case "size":
-			if !(gOpts.dircounts && f.IsDir()) {
-				info = fmt.Sprintf("%s %4s", info, humanize(f.Size()))
+			if !(f.IsDir() && gOpts.dircounts) {
+				var sz string
+				if f.IsDir() && f.dirSize < 0 {
+					sz = "-"
+				} else {
+					sz = humanize(f.TotalSize())
+				}
+				info = fmt.Sprintf("%s %4s", info, sz)
 				continue
 			}