How to invoke Linux shell env variable into vimrc?

Question

How to invoke Linux shell env variable into vimrc ?

I split vimrc configurations into multiple files and included these files in vimrc via :runtime [file]. This works well.

:runtime vimrc.d/vimrc.pathogen           " pick one and comment others
":runtime vimrc.d/vimrc.vim-plug
":runtime vimrc.d/vimrc.vundle

After that, I want to define a variable in vimrc to specify which vimrc.x can be used.

A single or double quotation needed here for a vimrc variable

let vimrc_plugin_manager=pathogen      " It shows Undefined variable: aaa
let vimrc_plugin_manager="pathogen"    " both '' and "" here works find

The following doesn't work.

let vimrc_plugin_manager='pathogen'
:runtime vimrc.d/vimrc.&{vimrc_plugin_manager}    " This doesn't work

---

And finally, I want to move the variable from vimrc to shell ENV, and want it to be invoked in vimrc.

Shell

export VIMRC_PLUGIN_MANAGER=pathogen

vimrc

let vimrc_plugin_manager=&VIMRC_PLUGIN_MANAGER   " invoke shell env var to vimrc; seems not work
:runtime vimrc.d/vimrc.&{vimrc_plugin_manager}   " This doesn't work

How can it work? I have searched a lot and havent' find solution yet.

Answer 1

If you wrap your :runtime in an :exec you should be able to use your Vim variable.

let vimrc_customization='aaa'

:exec 'runtime vimrc.d/vimrc.' . vimrc_customization