Get the dir of $MYVIMRC and concatenate a different file path

Question

Within some run time files I would like to source a file relative to the $MYVIMRC file. My best efforts have lead me to this (which does not work):

source expand("$MYVIMRC:p:h") . "/vimrc/env.vim")

Answer 1

Your best effort:

source expand("$MYVIMRC:p:h") . "/vimrc/env.vim")

has issues:

1. source command doesn't work with "strings"
2. even if it worked with strings, you have strange last unbalanced )

You can try using :execute statement with composed source:

:exe "source " . fnamemodify("$MYVIMRC", ":p:h") . "/vimrc/env.vim"

Note that expand("$MYVIMRC:p:h") will not work as expected, but fnamemodify will.

Another option I personally use is:

source <sfile>:h/statusline.vim

where <sfile> when executing a ":source" command, is replaced with the file name of the sourced file.

Answer 2

A possible solution:

execute printf('source %s/vimrc/env.vim', fnamemodify($MYVIMRC, ':h'))