Vimscript: how to get the current list of user-defined functions and determine the files they are sourced from

Question

Is there a way I can query from within Vim information about user-defined vimscript functions and script files that Vim knows about?

The things I'd like to know are:

• Is a particular function defined?
• Which source file is a given function defined in?
• What are the vimscript files that have been sourced?

Etc.

Answer 1

• Is a particular function defined?

Use the exists function:

:echo exists("*funcname")

• Which source file is a given function defined in?

Unfortunately, there's no straight-forward way to do this. You would have to parse the output of :verbose function.

• What are the vimscript files that have been sourced?

Again, there's no straight-forward way to do this. You would have to parse the output of :scriptnames.

What's the big picture for what you're trying to do that made you ask these questions? There may be a better way to achieve it without needing answers to each question.