I have updated the plugin TextImporter in the first post of this thread to version 0.1.0.5.

The previous version of the plugin would allow only one text file to be imported each time you ran the plugin; this version will allow you to import several text files before the plugin closes. It also has a new facility for checking for updates and this allows you to set the time interval between checks for new versions.

I have also uploaded a user guide for the plugin.

It's a helpful plugin to me, it would be better If you can create an option that we can import multiple files in 1 time?

I have made a few changes to the plugin that includes the ability to import multiple text files from a single folder without having to import them individually.

When the file dialog opens, navigate to the folder containing your text files and CTRL-click on each file that you want to import and then click the OK button on the file dialog. All the selected files will be imported into Sigil when you click the plugin's Close button.

Alternatively you can use SHIFT click in the usual manner to select a group of text files for importing into your ePub.

Can this plugin work on Linux? I get this error when trying to run it:

NameError: name 'ttk' is not defined

Your python implementation is missing its Tkinter/ttk support.

I had to change this line in plugin.py:

to

Now it works.