How to search standard library files in languages without include expressions?

Question

vim-apathy advertises the many possibilities of :h include-search.

However, if the programming language under consideration (here GAP), does not have include expressions but the interpreter always loads a standard library from a library path and other packages with other means, are these languages excluded from this functionality?

Is it possible to explicitly add files, e.g. in an ftplugin, to the include search, so they are searched when one presses [i?

I was looking for something like

setlocal includedefaults+=$LIB/*.gd,$LIB/*.gi

or a vim function which can customize the include file list.

A plugin or NeoVim only solution would be good enough as well.

Answer 1

Include search is done in the current and included files.

If your language doesn't let you explicitly include a file, then all Vim can do is search in the current file, which makes using include search rather pointless. That feature is simply not fit for your specific use case.

If you know where those packages are stored, then you might have more luck with :help tags and something like Universal Ctags, if it supports your language.

---

Now, the documentation mentions LoadPackage(), which can be considered like an "include":

" very raw, adjust to taste
setlocal include=LoadPackage

This might work if you set :help 'path' and :help 'includeexpr' properly, to a list of default directories for the former, and to a function that returns a searchable path for the latter.