From 8b199cb2fe5f9c2380937bfd5ea0654bdaef2918 Mon Sep 17 00:00:00 2001
From: Billy Vong <billyvg@gmail.com>
Date: Sun, 29 Oct 2017 11:06:47 -0700
Subject: [PATCH 1/3] health: add node health check

---
 runtime/autoload/health/provider.vim | 62 ++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/runtime/autoload/health/provider.vim b/runtime/autoload/health/provider.vim
index 0eaa678459..806a9d043b 100644
--- a/runtime/autoload/health/provider.vim
+++ b/runtime/autoload/health/provider.vim
@@ -487,9 +487,71 @@ function! s:check_ruby() abort
   endif
 endfunction
 
+function! s:check_node() abort
+  call health#report_start('Node provider (optional)')
+
+  let loaded_var = 'g:loaded_node_provider'
+  if exists(loaded_var) && !exists('*provider#node#Call')
+    call health#report_info('Disabled. '.loaded_var.'='.eval(loaded_var))
+    return
+  endif
+
+  if !executable('node') || !executable('npm') || !executable('yarn')
+    call health#report_warn(
+          \ '`node` and `npm` must be in $PATH.',
+          \ ['Install Node.js and verify that `node` and `npm` commands work.'])
+    return
+  endif
+  call health#report_info('Node: '. s:system('node -v'))
+
+  let host = provider#node#Detect()
+  if empty(host)
+    call health#report_warn('Missing "neovim" npm package.',
+          \ ['Run in shell: npm install -g neovim',
+          \  'Is the npm bin directory in $PATH?'])
+    return
+  endif
+  call health#report_info('Host: '. host)
+
+  let latest_npm_cmd = has('win32') ? 'cmd /c npm info neovim --json' : 'npm info neovim --json'
+  let latest_npm = s:system(split(latest_npm_cmd))
+  if s:shell_error || empty(latest_npm)
+    call health#report_error('Failed to run: '. latest_npm_cmd,
+          \ ["Make sure you're connected to the internet.",
+          \  'Are you behind a firewall or proxy?'])
+    return
+  endif
+  if !empty(latest_npm)
+    try
+      let pkg_data = json_decode(latest_npm)
+    catch /E474/
+      return 'error: '.latest_npm
+    endtry
+    let latest_npm = get(get(pkg_data, 'dist-tags', {}), 'latest', 'unable to parse')
+  endif
+
+  let current_npm_cmd = host .' --version'
+  let current_npm = s:system(current_npm_cmd)
+  if s:shell_error
+    call health#report_error('Failed to run: '. current_npm_cmd,
+          \ ['Report this issue with the output of: ', current_npm_cmd])
+    return
+  endif
+
+  if s:version_cmp(current_npm, latest_npm) == -1
+    call health#report_warn(
+          \ printf('Package "neovim" is out-of-date. Installed: %s, latest: %s',
+          \ current_npm, latest_npm),
+          \ ['Run in shell: npm update neovim'])
+  else
+    call health#report_ok('Latest "neovim" npm is installed: '. current_npm)
+  endif
+endfunction
+
 function! health#provider#check() abort
   call s:check_clipboard()
   call s:check_python(2)
   call s:check_python(3)
   call s:check_ruby()
+  call s:check_node()
 endfunction

From 7890157931a3fdfddb647a06e27346071c55564c Mon Sep 17 00:00:00 2001
From: Billy Vong <billyvg@gmail.com>
Date: Sun, 29 Oct 2017 11:10:33 -0700
Subject: [PATCH 2/3] remote: add node.js as a remote plugin provider

---
 runtime/autoload/provider/node.vim | 82 ++++++++++++++++++++++++++++++
 runtime/autoload/remote/host.vim   |  4 ++
 2 files changed, 86 insertions(+)
 create mode 100644 runtime/autoload/provider/node.vim

diff --git a/runtime/autoload/provider/node.vim b/runtime/autoload/provider/node.vim
new file mode 100644
index 0000000000..8a2a105bb4
--- /dev/null
+++ b/runtime/autoload/provider/node.vim
@@ -0,0 +1,82 @@
+if exists('g:loaded_node_provider')
+  finish
+endif
+let g:loaded_node_provider = 1
+
+let s:stderr = {}
+let s:job_opts = {'rpc': v:true}
+
+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
+
+function! provider#node#Detect() abort
+  return exepath('neovim-node-host')
+endfunction
+
+function! provider#node#Prog()
+  return s:prog
+endfunction
+
+function! provider#node#Require(host) abort
+  if s:err != ''
+    echoerr s:err
+    return
+  endif
+
+  let args = ['node']
+
+  if !empty($NVIM_NODE_HOST_DEBUG)
+    call add(args, '--inspect-brk')
+  endif
+
+  call add(args , provider#node#Prog())
+
+  try
+    let channel_id = jobstart(args, s:job_opts)
+    if rpcrequest(channel_id, 'poll') ==# 'ok'
+      return channel_id
+    endif
+  catch
+    echomsg v:throwpoint
+    echomsg v:exception
+    for row in get(s:stderr, channel_id, [])
+      echomsg row
+    endfor
+  endtry
+  throw remote#host#LoadErrorForHost(a:host.orig_name, '$NVIM_NODE_LOG_FILE')
+endfunction
+
+function! provider#node#Call(method, args)
+  if s:err != ''
+    echoerr s:err
+    return
+  endif
+
+  if !exists('s:host')
+    try
+      let s:host = remote#host#Require('node')
+    catch
+      let s:err = v:exception
+      echohl WarningMsg
+      echomsg v:exception
+      echohl None
+      return
+    endtry
+  endif
+  return call('rpcrequest', insert(insert(a:args, 'node_'.a:method), s:host))
+endfunction
+
+
+let s:err = ''
+let s:prog = provider#node#Detect()
+
+if empty(s:prog)
+  let s:err = 'Cannot find the "neovim" node package. Try :CheckHealth'
+endif
+
+call remote#host#RegisterPlugin('node-provider', 'node', [])
diff --git a/runtime/autoload/remote/host.vim b/runtime/autoload/remote/host.vim
index e695fb7df7..dfaab7d246 100644
--- a/runtime/autoload/remote/host.vim
+++ b/runtime/autoload/remote/host.vim
@@ -199,3 +199,7 @@ call remote#host#Register('python3', '*',
 " Ruby
 call remote#host#Register('ruby', '*.rb',
       \ function('provider#ruby#Require'))
+
+" nodejs
+call remote#host#Register('node', '*',
+      \ function('provider#node#Require'))

From eed10f7e23a7ec27e5ba147379fb6acbfcb10c20 Mon Sep 17 00:00:00 2001
From: Billy Vong <billyvg@gmail.com>
Date: Tue, 31 Oct 2017 08:35:29 -0700
Subject: [PATCH 3/3] use `provider#stderr_collector`

---
 runtime/autoload/provider/node.vim | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/runtime/autoload/provider/node.vim b/runtime/autoload/provider/node.vim
index 8a2a105bb4..ce2740e813 100644
--- a/runtime/autoload/provider/node.vim
+++ b/runtime/autoload/provider/node.vim
@@ -3,16 +3,7 @@ if exists('g:loaded_node_provider')
 endif
 let g:loaded_node_provider = 1
 
-let s:stderr = {}
-let s:job_opts = {'rpc': v:true}
-
-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#node#Detect() abort
   return exepath('neovim-node-host')
@@ -44,10 +35,13 @@ function! provider#node#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
   endtry
+  finally
+    call provider#clear_stderr(channel_id)
+  endtry
   throw remote#host#LoadErrorForHost(a:host.orig_name, '$NVIM_NODE_LOG_FILE')
 endfunction