runtime: Allow overriding ruby host with g:ruby_host_prog

This allows users who have per-project Ruby versions (e.g. with `rvm`)
to pin to a particular gem installation.

For example: `let g:ruby_host_prog = 'rvm system do neovim-ruby-host'`

1 files changed, 8 insertions, 4 deletions

diff --git a/runtime/autoload/provider/ruby.vim b/runtime/autoload/provider/ruby.vim
index c8ede20a75..91b7fb9f2c 100644
--- a/runtime/autoload/provider/ruby.vim
+++ b/runtime/autoload/provider/ruby.vim
@@ -16,7 +16,11 @@ function! s:job_opts.on_stderr(chan_id, data, event)
 endfunction
 
 function! provider#ruby#Detect() abort
-  return exepath('neovim-ruby-host')
+  if exists("g:ruby_host_prog")
+    return g:ruby_host_prog
+  else
+    return exepath('neovim-ruby-host')
+  end
 endfunction
 
 function! provider#ruby#Prog()
@@ -24,15 +28,15 @@ function! provider#ruby#Prog()
 endfunction
 
 function! provider#ruby#Require(host) abort
-  let args = [provider#ruby#Prog()]
+  let prog = provider#ruby#Prog()
   let ruby_plugins = remote#host#PluginsForHost(a:host.name)
 
   for plugin in ruby_plugins
-    call add(args, plugin.path)
+    let prog .= " " . shellescape(plugin.path)
   endfor
 
   try
-    let channel_id = jobstart(args, s:job_opts)
+    let channel_id = jobstart(prog, s:job_opts)
     if rpcrequest(channel_id, 'poll') ==# 'ok'
       return channel_id
     endif