3 files changed, 30 insertions, 19 deletions
diff --git a/runtime/autoload/provider.vim b/runtime/autoload/provider.vim
new file mode 100644
index 0000000000..a4d5241b57
--- /dev/null
+++ b/runtime/autoload/provider.vim
@@ -0,0 +1,18 @@
+" Common functionality for providers
+
+let s:stderr = {}
+
+function! provider#stderr_collector(chan_id, data, event) dict
+   let stderr = get(s:stderr, a:chan_id, [''])
+   let stderr[-1] .= a:data[0]
+   call extend(stderr, a:data[1:])
+   let s:stderr[a:chan_id] = stderr
+endfunction
+
+function! provider#clear_stderr(chan_id)
+   silent! call delete(s:stderr, a:chan_id)
+endfunction
+
+function! provider#get_stderr(chan_id)
+   return get(s:stderr, a:chan_id, [])
+endfunction
diff --git a/runtime/autoload/provider/clipboard.vim b/runtime/autoload/provider/clipboard.vim
index 86006497d9..8eb694e9fa 100644
--- a/runtime/autoload/provider/clipboard.vim
+++ b/runtime/autoload/provider/clipboard.vim
@@ -6,7 +6,7 @@ let s:paste = {}
 
 " When caching is enabled, store the jobid of the xclip/xsel process keeping
 " ownership of the selection, so we know how long the cache is valid.
-let s:selection = { 'owner': 0, 'data': [] }
+let s:selection = { 'owner': 0, 'data': [], 'on_stderr': function('provider#stderr_collector') }
 
 function! s:selection.on_exit(jobid, data, event) abort
   " At this point this nvim instance might already have launched
@@ -14,12 +14,13 @@ function! s:selection.on_exit(jobid, data, event) abort
   if self.owner == a:jobid
     let self.owner = 0
   endif
-endfunction
-
-function! s:selection.on_stderr(jobid, data, event) abort
-  echohl WarningMsg
-  echomsg 'clipboard: error invoking '.get(self.argv, 0, '?').': '.join(a:data)
-  echohl None
+  if a:data != 0
+    let stderr = provider#get_stderr(a:jobid)
+    echohl WarningMsg
+    echomsg 'clipboard: error invoking '.get(self.argv, 0, '?').': '.join(stderr)
+    echohl None
+  endif
+  call provider#clear_stderr(a:jobid)
 endfunction
 
 let s:selections = { '*': s:selection, '+': copy(s:selection)}
diff --git a/runtime/autoload/provider/pythonx.vim b/runtime/autoload/provider/pythonx.vim
index 2f64c22c71..7285ed43ea 100644
--- a/runtime/autoload/provider/pythonx.vim
+++ b/runtime/autoload/provider/pythonx.vim
@@ -5,17 +5,7 @@ endif
 
 let s:loaded_pythonx_provider = 1
 
-let s:stderr = {}
-let s:job_opts = {'rpc': v:true}
-
-" TODO(bfredl): this logic is common and should be builtin
-function! s:job_opts.on_stderr(chan_id, data, event)
-  let stderr = get(s:stderr, a:chan_id, [''])
-  let last = remove(stderr, -1)
-  let a:data[0] = last.a:data[0]
-  call extend(stderr, a:data)
-  let s:stderr[a:chan_id] = stderr
-endfunction
+let s:job_opts = {'rpc': v:true, 'on_stderr': function('provider#stderr_collector')}
 
 function! provider#pythonx#Require(host) abort
   let ver = (a:host.orig_name ==# 'python') ? 2 : 3
@@ -38,9 +28,11 @@ function! provider#pythonx#Require(host) abort
   catch
     echomsg v:throwpoint
     echomsg v:exception
-    for row in get(s:stderr, channel_id, [])
+    for row in provider#get_stderr(channel_id)
       echomsg row
     endfor
+  finally
+    call provider#clear_stderr(channel_id)
   endtry
   throw remote#host#LoadErrorForHost(a:host.orig_name,
         \ '$NVIM_PYTHON_LOG_FILE')