Generating helptags for vim plugins

[nils]

Hello everyone,

I'm trying to switch my home environment to guix home (from Chef).
As a first step, I'm writing package definitions for the various vim plugins I 
use.
I followed the simple plugins in gnu/packages/vim, using git-fetch + 
copy-build-system. This worked fine, but I noticed that there is no code to 
generate the helptags, meaning the plugin documentations don't show up in vim 
when using :help. Having the documentations available is important to me! 

My solution was to write a vimplugin-build-system. It uses copy-build-system 
for most things, but generates the helptags for the plugin as an additional 
step after installation. Technically that works, in that the helptags for the 
plugin are generated and available in vim. Sadly the concept was wrong, because 
the helptags file is always named "tags" and needs to be in the same directory 
as the help file. This means installing multiple plugins has the doc files for 
all plugins symlinked in ~/.guix-home/profile/share/vim/vimfiles/doc , and then 
the "tags" file of (I'm guessing) the last plugin, meaning only that last 
plugin documentation is available in vim.

Solutions I could think of:

1) Run the helptags generation after *all* plugins are installed
2) Do not install all plugins to ~/.guix-home/profile/share/vim/vimfiles but 
rather keep them in one subfolder per plugin (which is how the built-in vim 
package management works, and most or all vim plugin managers). 

How could 1) be implemented? I could do 2) rather easily I think, but it would 
contributing the plugin packages difficult, since it needs changes in the 
gnu/packages/aux-files/guix.vim to add those directories to the vim runtime 
path.

Has anyone already spent some time on this? It looks to me like an issue that 
everyone would run into if they use the already packaged plugins in 
gnu/packages/vim.