Quote:
Originally Posted by loveheaven
I want to add some functions to Ebook-edit and I can use these functions in the editor I launch by right-click an EPUB file and select the menu "Open with ebook-edit" in the MacOS system menu.
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Yes you can do that with the development method, though you dont even need that you can create editor plugins.
https://manual.calibre-ebook.com/creating_plugins.html
And see some of the existing editor plugins for examples