How do I pass a string concatenation to the source command in vim?

Question

My current .vimrc includes these two lines, which are a bit redundant

let g:opamshare = "/home/hugo/.opam/system/share"
source /home/hugo/.opam/system/share/vim/syntax/ocp-indent.vim

Is there a way to use the value of the opamshare variable in the source command on the second line? I tried

source g:opamshare . "/vim/syntax/ocp-indent.vim"

but that gives me a E172: Only one file name allowed error.

Answer 1

From vim doc:

:so[urce] {file}        Read Ex commands from {file}.

You need to pass only one file as argument to source command.
It doesn't treat argument as string, so you cannot use .(dot) to concat strings.

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Try this:

:exec printf('source %s/%s', g:opamshare, 'vim/syntax/ocp-indent.vim')