lsf: Add 'm' format specifier to show the MimeType

cmd/lsf/lsf.go

@@ -64,6 +64,7 @@ output:
     t - modification time
     h - hash
     i - ID of object if known
+    m - MimeType of object if known
 
 So if you wanted the path, size and modification time, you would use
 --format "pst", or maybe --format "tsp" to put the path last.
@@ -141,6 +142,8 @@ func Lsf(fsrc fs.Fs, out io.Writer) error {
 			list.AddHash(hashType)
 		case 'i':
 			list.AddID()
+		case 'm':
+			list.AddMimeType()
 		default:
 			return errors.Errorf("Unknown format character %q", char)
 		}

fs/operations/operations.go

@@ -1430,6 +1430,13 @@ func (l *ListFormat) AddID() {
 	})
 }
 
+// AddMimeType adds file's MimeType to the output if known
+func (l *ListFormat) AddMimeType() {
+	l.AppendOutput(func() string {
+		return fs.MimeTypeDirEntry(l.entry)
+	})
+}
+
 // AppendOutput adds string generated by specific function to printed output
 func (l *ListFormat) AppendOutput(functionToAppend func() string) {
 	if len(l.output) > 0 {

fs/operations/operations_test.go

@@ -716,6 +716,11 @@ func TestListFormat(t *testing.T) {
 	list.AddID()
 	_ = operations.ListFormatted(&items[0], &list) // Can't really check anything - at least it didn't panic!
 
+	list.SetOutput(nil)
+	list.AddMimeType()
+	assert.Contains(t, operations.ListFormatted(&items[0], &list), "/")
+	assert.Equal(t, "inode/directory", operations.ListFormatted(&items[1], &list))
+
 	list.SetOutput(nil)
 	list.AddSize()
 	assert.Equal(t, "1", operations.ListFormatted(&items[0], &list))