How do I programmatically add to contextual menus?

Question

To programmatically add to menus you can do as described here:

How do I add to menus?

What can I do to programmatically add to contextual menus? Is something similar to AddMenuCommands available?

Answer 1

There's an option ContextMenu, which you seem to be able to set at cell, notebook, or even box level. They all default to something like

FEPrivate`FrontEndResource["ContextMenus", "something"]

That info seems to be in the ContextMenus.tr file in the $InstallationDirectory, SystemFiles, FrontEnd, TextResources.

In any case, all that that option needs is a list of MenuItem[...]. You can look at that file (or at MenuSetup.tr) to get a hang on the syntax. Then it's just setting the option.

Apart from the brute force method of reading the file, creating your own, adding your Menus, and setting that option, I still haven't found a way to "append" the MenuItems. Only to replace... I'll edit if I find something