let user select one of the folders data/, sdata/

sohstationviewer/view/main_window.py

@@ -39,6 +39,9 @@ from sohstationviewer.view.util.functions import (
     check_chan_wildcards_format, check_masspos,
 )
 from sohstationviewer.view.channel_prefer_dialog import ChannelPreferDialog
+from sohstationviewer.view.create_muti_buttons_dialog import (
+    create_multi_buttons_dialog
+)
 
 from sohstationviewer.controller.processing import detect_data_type
 from sohstationviewer.controller.util import (
@@ -508,12 +511,40 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
                 else:
                     self.list_of_dir = [root_dir.joinpath('sdata')]
         else:
-            # When "From Data Card" checkbox is checked, sub directories of the
-            # current dir (root_dir) will be displayed in File List box.
+            # When "From Data Card" checkbox isn't checked, sub directories of
+            # the current dir (root_dir) will be displayed in File List box.
             # User can select one or more sub-directories to process from.
             self.list_of_dir = [
                 root_dir.joinpath(item.text())
                 for item in self.open_files_list.selectedItems()]
+            has_data_sdata = False
+            for folder in self.list_of_dir:
+                has_data_sdata = check_data_sdata(folder)
+                if has_data_sdata:
+                    break
+            if has_data_sdata:
+                if len(self.list_of_dir) > 1:
+                    msg = ("More than one folders are selected. At least one "
+                           "of them has sub-folders data/ and sdata/.\n\n"
+                           "It confuses SOH View.\n\n"
+                           "SOH View will read only one folder with "
+                           "sub-folder data/ and sdata/.")
+                    raise Exception(msg)
+                else:
+                    msg = ("The selected folder contains 2 data folders:\n"
+                           "'data/', 'sdata/'.\n\n"
+                           "Please select one of them to read data from.")
+                    result = create_multi_buttons_dialog(
+                        msg, ['data/', 'sdata/'], abort_is_0=True)
+                    if result == 0:
+                        self.list_of_dir = [
+                            self.list_of_dir[0].joinpath('data')]
+                    elif result == 1:
+                        self.list_of_dir = [
+                            self.list_of_dir[0].joinpath('sdata')]
+                    else:
+                        raise Exception('Process is cancelled by user.')
+
             if self.list_of_dir == []:
                 msg = "No directories have been selected."
                 raise Exception(msg)