Merge pull request #4410 from alexgenco/ruby_rplugin

Ruby remote plugin support

runtime/autoload/provider/pythonx.vim

@@ -27,13 +27,8 @@ function! provider#pythonx#Require(host) abort
     echomsg v:throwpoint
     echomsg v:exception
   endtry
-  throw 'Failed to load '. a:host.orig_name . ' host. '.
-    \ 'You can try to see what happened '.
-    \ 'by starting Neovim with the environment variable '.
-    \ '$NVIM_PYTHON_LOG_FILE set to a file and opening '.
-    \ 'the generated log file. Also, the host stderr will be available '.
-    \ 'in Neovim log, so it may contain useful information. '.
-    \ 'See also ~/.nvimlog.'
+  throw remote#host#LoadErrorForHost(a:host.orig_name,
+        \ '$NVIM_PYTHON_LOG_FILE')
 endfunction
 
 function! provider#pythonx#Detect(major_ver) abort

runtime/autoload/provider/ruby.vim

@@ -0,0 +1,34 @@
+" The Ruby provider helper
+if exists('s:loaded_ruby_provider')
+  finish
+endif
+
+let s:loaded_ruby_provider = 1
+
+function! provider#ruby#Require(host) abort
+  " Collect registered Ruby plugins into args
+  let args = []
+  let ruby_plugins = remote#host#PluginsForHost(a:host.name)
+
+  for plugin in ruby_plugins
+    call add(args, plugin.path)
+  endfor
+
+  try
+    let channel_id = rpcstart(provider#ruby#Prog(), args)
+
+    if rpcrequest(channel_id, 'poll') == 'ok'
+      return channel_id
+    endif
+  catch
+    echomsg v:throwpoint
+    echomsg v:exception
+  endtry
+
+  throw remote#host#LoadErrorForHost(a:host.orig_name,
+        \ '$NVIM_RUBY_LOG_FILE')
+endfunction
+
+function! provider#ruby#Prog() abort
+  return 'neovim-ruby-host'
+endfunction

runtime/autoload/remote/host.vim

@@ -207,6 +207,17 @@ function! remote#host#PluginsForHost(host) abort
 endfunction
 
 
+function! remote#host#LoadErrorForHost(host, log) abort
+  return 'Failed to load '. a:host . ' host. '.
+    \ 'You can try to see what happened '.
+    \ 'by starting Neovim with the environment variable '.
+    \ a:log . ' set to a file and opening the generated '.
+    \ 'log file. Also, the host stderr will be available '.
+    \ 'in Neovim log, so it may contain useful information. '.
+    \ 'See also ~/.nvimlog.'
+endfunction
+
+
 " Registration of standard hosts
 
 " Python/Python3
@@ -214,3 +225,7 @@ call remote#host#Register('python', '*',
       \ function('provider#pythonx#Require'))
 call remote#host#Register('python3', '*',
       \ function('provider#pythonx#Require'))
+
+" Ruby
+call remote#host#Register('ruby', '*.rb',
+      \ function('provider#ruby#Require'))