refactor: rewrite ruby provider in lua

runtime/autoload/provider/ruby.vim

@@ -1,73 +1,16 @@
-" The Ruby provider helper
 if exists('g:loaded_ruby_provider')
   finish
 endif
-let g:loaded_ruby_provider = 1
-
-function! provider#ruby#Detect() abort
-  let e = empty(s:prog) ? 'missing ruby or ruby-host' : ''
-  return [s:prog, e]
-endfunction
-
-function! provider#ruby#Prog() abort
-  return s:prog
-endfunction
 
 function! provider#ruby#Require(host) abort
-  let prog = provider#ruby#Prog()
-  let ruby_plugins = remote#host#PluginsForHost(a:host.name)
-
-  for plugin in ruby_plugins
-    let prog .= " " . shellescape(plugin.path)
-  endfor
-
-  return provider#Poll(prog, a:host.orig_name, '$NVIM_RUBY_LOG_FILE')
+  return v:lua.require'vim.provider.ruby'.require(a:host)
 endfunction
 
 function! provider#ruby#Call(method, args) abort
-  if s:err != ''
-    echoerr s:err
-    return
-  endif
-
-  if !exists('s:host')
-    try
-      let s:host = remote#host#Require('legacy-ruby-provider')
-    catch
-      let s:err = v:exception
-      echohl WarningMsg
-      echomsg v:exception
-      echohl None
-      return
-    endtry
-  endif
-  return call('rpcrequest', insert(insert(a:args, 'ruby_'.a:method), s:host))
+  return v:lua.require'vim.provider.ruby'.call(a:method, a:args)
 endfunction
 
-function! s:detect()
-  if exists("g:ruby_host_prog")
-    return expand(g:ruby_host_prog, v:true)
-  elseif has('win32')
-    return exepath('neovim-ruby-host.bat')
-  else
-    let p = exepath('neovim-ruby-host')
-    if empty(p)
-      return ''
-    endif
-    " neovim-ruby-host could be an rbenv shim for another Ruby version.
-    call system(p)
-    return v:shell_error ? '' : p
-  end
-endfunction
-
-let s:err = ''
-let s:prog = s:detect()
-let s:plugin_path = expand('<sfile>:p:h') . '/script_host.rb'
+let s:prog = v:lua.require'vim.provider.ruby'.detect()
 let g:loaded_ruby_provider = empty(s:prog) ? 1 : 2
-
-if g:loaded_ruby_provider != 2
-  let s:err = 'Cannot find the neovim RubyGem. Try :checkhealth'
-endif
-
-call remote#host#RegisterClone('legacy-ruby-provider', 'ruby')
-call remote#host#RegisterPlugin('legacy-ruby-provider', s:plugin_path, [])
+let s:plugin_path = expand('<sfile>:p:h') . '/script_host.rb'
+call v:lua.require'vim.provider.ruby'.start(s:plugin_path)