6 files changed, 70 insertions, 27 deletions
diff --git a/runtime/autoload/provider/clipboard.vim b/runtime/autoload/provider/clipboard.vim
index c7cb14ded7..0f4aa78ddd 100644
--- a/runtime/autoload/provider/clipboard.vim
+++ b/runtime/autoload/provider/clipboard.vim
@@ -58,18 +58,17 @@ elseif executable('doitclient')
   let s:copy['*'] = s:copy['+']
   let s:paste['*'] = s:paste['+']
 else
-  echom 'clipboard: No clipboard tool available. See :help nvim-clipboard'
+  echom 'clipboard: No clipboard tool available. See :help clipboard'
   finish
 endif
 
 let s:clipboard = {}
 
 function! s:clipboard.get(reg)
-  let reg = a:reg == '"' ? '+' : a:reg
-  if s:selections[reg].owner > 0
-    return s:selections[reg].data
+  if s:selections[a:reg].owner > 0
+    return s:selections[a:reg].data
   end
-  return s:try_cmd(s:paste[reg])
+  return s:try_cmd(s:paste[a:reg])
 endfunction
 
 function! s:clipboard.set(lines, regtype, reg)
@@ -94,6 +93,7 @@ function! s:clipboard.set(lines, regtype, reg)
   let selection.data = [a:lines, a:regtype]
   let argv = split(s:copy[a:reg], " ")
   let selection.detach = s:cache_enabled
+  let selection.cwd = "/"
   let jobid = jobstart(argv, selection)
   if jobid <= 0
     echohl WarningMsg
diff --git a/runtime/autoload/provider/python.vim b/runtime/autoload/provider/python.vim
index cb9d5c5296..b99a046375 100644
--- a/runtime/autoload/provider/python.vim
+++ b/runtime/autoload/provider/python.vim
@@ -1,5 +1,5 @@
 " The Python provider uses a Python host to emulate an environment for running
-" python-vim plugins. See ":help nvim-provider" for more information.
+" python-vim plugins. See ":help provider".
 "
 " Associating the plugin with the Python host is the first step because plugins
 " will be passed as command-line arguments
diff --git a/runtime/autoload/provider/python3.vim b/runtime/autoload/provider/python3.vim
index f4a751e7a2..4f47a03a9b 100644
--- a/runtime/autoload/provider/python3.vim
+++ b/runtime/autoload/provider/python3.vim
@@ -1,5 +1,5 @@
 " The Python3 provider uses a Python3 host to emulate an environment for running
-" python3 plugins. See ":help nvim-provider" for more information.
+" python3 plugins. See ":help provider".
 "
 " Associating the plugin with the Python3 host is the first step because
 " plugins will be passed as command-line arguments
diff --git a/runtime/autoload/provider/pythonx.vim b/runtime/autoload/provider/pythonx.vim
index 05815a4896..0ebf00112f 100644
--- a/runtime/autoload/provider/pythonx.vim
+++ b/runtime/autoload/provider/pythonx.vim
@@ -18,9 +18,9 @@ function! provider#pythonx#Require(host) abort
   endfor
 
   try
-    let channel_id = rpcstart((ver == '2' ?
+    let channel_id = rpcstart((ver ==# '2' ?
           \ provider#python#Prog() : provider#python3#Prog()), args)
-    if rpcrequest(channel_id, 'poll') == 'ok'
+    if rpcrequest(channel_id, 'poll') ==# 'ok'
       return channel_id
     endif
   catch
@@ -70,7 +70,7 @@ endfunction
 
 function! s:check_interpreter(prog, major_ver, skip) abort
   let prog_path = exepath(a:prog)
-  if prog_path == ''
+  if prog_path ==# ''
     return [0, a:prog . ' not found in search path or not executable.']
   endif
 
@@ -83,8 +83,8 @@ function! s:check_interpreter(prog, major_ver, skip) abort
   " Try to load neovim module, and output Python version.
   " Return codes:
   "   0  Neovim module can be loaded.
-  "   1  Something else went wrong.
   "   2  Neovim module cannot be loaded.
+  "   Otherwise something else went wrong (e.g. 1 or 127).
   let prog_ver = system([ a:prog , '-c' ,
         \ 'import sys; ' .
         \ 'sys.path.remove(""); ' .
@@ -93,7 +93,8 @@ function! s:check_interpreter(prog, major_ver, skip) abort
         \ 'exit(2*int(pkgutil.get_loader("neovim") is None))'
         \ ])
 
-  if prog_ver
+  if v:shell_error == 2 || v:shell_error == 0
+    " Check version only for expected return codes.
     if prog_ver !~ '^' . a:major_ver
       return [0, prog_path . ' is Python ' . prog_ver . ' and cannot provide Python '
             \ . a:major_ver . '.']
@@ -103,12 +104,16 @@ function! s:check_interpreter(prog, major_ver, skip) abort
     endif
   endif
 
-  if v:shell_error == 1
+  if v:shell_error == 2
+    return [0, prog_path . ' does not have the neovim module installed. '
+          \ . 'See ":help provider-python".']
+  elseif v:shell_error == 127
+    " This can happen with pyenv's shims.
+    return [0, prog_path . ' does not exist: ' . prog_ver]
+  elseif v:shell_error
     return [0, 'Checking ' . prog_path . ' caused an unknown error. '
-          \ . 'Please report this at github.com/neovim/neovim.']
-  elseif v:shell_error == 2
-    return [0, prog_path . ' does have not have the neovim module installed. '
-          \ . 'See ":help nvim-python".']
+          \ . '(' . v:shell_error . ', output: ' . prog_ver . ')'
+          \ . ' Please report this at github.com/neovim/neovim.']
   endif
 
   return [1, '']
diff --git a/runtime/autoload/provider/ruby.vim b/runtime/autoload/provider/ruby.vim
index aad8c09d28..e9130b98c1 100644
--- a/runtime/autoload/provider/ruby.vim
+++ b/runtime/autoload/provider/ruby.vim
@@ -1,12 +1,18 @@
 " The Ruby provider helper
-if exists('s:loaded_ruby_provider')
+if exists('g:loaded_ruby_provider')
   finish
 endif
+let g:loaded_ruby_provider = 1
 
-let s:loaded_ruby_provider = 1
+function! provider#ruby#Detect() abort
+  return exepath('neovim-ruby-host')
+endfunction
+
+function! provider#ruby#Prog()
+  return s:prog
+endfunction
 
 function! provider#ruby#Require(host) abort
-  " Collect registered Ruby plugins into args
   let args = []
   let ruby_plugins = remote#host#PluginsForHost(a:host.name)
 
@@ -16,19 +22,43 @@ function! provider#ruby#Require(host) abort
 
   try
     let channel_id = rpcstart(provider#ruby#Prog(), args)
-
-    if rpcrequest(channel_id, 'poll') == 'ok'
+    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,
-        \ '$NVIM_RUBY_LOG_FILE')
+  throw remote#host#LoadErrorForHost(a:host.orig_name, '$NVIM_RUBY_LOG_FILE')
 endfunction
 
-function! provider#ruby#Prog() abort
-  return 'neovim-ruby-host'
+function! provider#ruby#Call(method, args)
+  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))
 endfunction
+
+let s:err = ''
+let s:prog = provider#ruby#Detect()
+let s:plugin_path = expand('<sfile>:p:h') . '/script_host.rb'
+
+if empty(s:prog)
+  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, [])
diff --git a/runtime/autoload/provider/script_host.rb b/runtime/autoload/provider/script_host.rb
new file mode 100644
index 0000000000..1dade766c7
--- /dev/null
+++ b/runtime/autoload/provider/script_host.rb
@@ -0,0 +1,8 @@
+begin
+  require "neovim/ruby_provider"
+rescue LoadError
+  warn(
+    "Your neovim RubyGem is missing or out of date. " +
+    "Install the latest version using `gem install neovim`."
+  )
+end