customization - How to prevent front end from suggesting Symbol option names (when actually String), and from adding them to Global` context

Help!

I am writing a package with a function which takes lots and lots of different options which are Strings. When used, the front end autocompletion is suggesting them in Symbol form. If the resulting code is run, it is added to the General` context. Observe:

Define the Options of MyFunc, and its SyntaxInformation

Options[MyFunc] = {"MyOpt" -> True};
SyntaxInformation[MyFunc] = {"ArgumentsPattern" -> {_, OptionsPattern[]}};

Then, start typing MyFunc[3.2, My, and you will see MyOpt as a suggestion:

enter image description here

If you run the finished statement MyFunc[3.2, MyOpt->False], the program works as if it had been a String (totally unacceptable), and the option symbol MyOpt is added to the Global` context (also totally unacceptable):

enter image description here

This leads to a proliferation of these symbols in the user's front end, which is annoying. How can I prevent this?

Answer

You can use undocumented "OptionNames" property of SyntaxInformation to customize option names suggestions (and coloring of invalid option names).

MyFunc // ClearAll
MyFunc // Options = {"MyOpt" -> True};
MyFunc // SyntaxInformation = {

    "ArgumentsPattern" -> {_, OptionsPattern[]},
    "OptionNames" -> {"\"MyOpt\""}
};

After typing MyFunc[3.2, My I get (in version 11.0):

Comments

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