ci: nodejs client acceptance-test #7706

ci: install nodejs 8 in Appveyor, Travis

provider: check node version for debug support
Resolve https://github.com/neovim/neovim/pull/7577#issuecomment-350590592 for Unix.

provider: test if nodejs in ci supports --inspect-brk

nodejs host for neovim requires nodejs 6+ to work properly.
nodejs 6.12+ or 7.6+ is required for debug support via `node --inspect-brk`.

provider: run cli.js of nodejs host directly

npm shims are useless because the user cannot set node to debug mode via
--inspect-brk. This is problematic on Windows which use batchfiles and
shell scripts to compensate for not supporting shebang.

The patch uses `npm root -g` to get the absolute path of the global npm
modules. If that fails, then the user did not install neovim npm package
globally. Use that absolute path to find `neovim/bin/cli.js`, which is
what the npm shim actually runs with node. glob() is for a simple file
check in case bin/ is removed because the npm shims are ignored now.

2 files changed, 41 insertions, 14 deletions

diff --git a/runtime/autoload/health/provider.vim b/runtime/autoload/health/provider.vim
index 0201ed8062..188b67c4c1 100644
--- a/runtime/autoload/health/provider.vim
+++ b/runtime/autoload/health/provider.vim
@@ -488,7 +488,7 @@ function! s:check_ruby() abort
 endfunction
 
 function! s:check_node() abort
-  call health#report_start('Node provider (optional)')
+  call health#report_start('Node.js provider (optional)')
 
   let loaded_var = 'g:loaded_node_provider'
   if exists(loaded_var) && !exists('*provider#node#Call')
@@ -502,7 +502,14 @@ function! s:check_node() abort
           \ ['Install Node.js and verify that `node` and `npm` commands work.'])
     return
   endif
-  call health#report_info('Node: '. s:system('node -v'))
+  let node_v = get(split(s:system('node -v'), "\n"), 0, '')
+  call health#report_info('Node.js: '. node_v)
+  if !s:shell_error && s:version_cmp(node_v[1:], '6.0.0') < 0
+    call health#report_warn('Neovim node.js host does not support '.node_v)
+  endif
+  if !provider#node#can_inspect()
+    call health#report_warn('node.js on this system does not support --inspect-brk so $NVIM_NODE_HOST_DEBUG is ignored.')
+  endif
 
   let host = provider#node#Detect()
   if empty(host)
@@ -511,7 +518,7 @@ function! s:check_node() abort
           \  'Is the npm bin directory in $PATH?'])
     return
   endif
-  call health#report_info('Host: '. host)
+  call health#report_info('Neovim node.js 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))
@@ -530,7 +537,7 @@ function! s:check_node() abort
     let latest_npm = get(get(pkg_data, 'dist-tags', {}), 'latest', 'unable to parse')
   endif
 
-  let current_npm_cmd = host .' --version'
+  let current_npm_cmd = ['node', host, '--version']
   let current_npm = s:system(current_npm_cmd)
   if s:shell_error
     call health#report_error('Failed to run: '. current_npm_cmd,
diff --git a/runtime/autoload/provider/node.vim b/runtime/autoload/provider/node.vim
index b08ad4f316..67b54c6439 100644
--- a/runtime/autoload/provider/node.vim
+++ b/runtime/autoload/provider/node.vim
@@ -5,8 +5,32 @@ let g:loaded_node_provider = 1
 
 let s:job_opts = {'rpc': v:true, 'on_stderr': function('provider#stderr_collector')}
 
+" Support for --inspect-brk requires node 6.12+ or 7.6+ or 8+
+" Return 1 if it is supported
+" Return 0 otherwise
+function! provider#node#can_inspect()
+  if !executable('node')
+    return 0
+  endif
+  let node_v = get(split(system(['node', '-v']), "\n"), 0, '')
+  if v:shell_error || node_v[0] !=# 'v'
+    return 0
+  endif
+  " [major, minor, patch]
+  let node_v = split(node_v[1:], '\.')
+  return len(node_v) == 3 && (
+  \ (node_v[0] > 7) ||
+  \ (node_v[0] == 7 && node_v[1] >= 6) ||
+  \ (node_v[0] == 6 && node_v[1] >= 12)
+  \ )
+endfunction
+
 function! provider#node#Detect() abort
-  return has('win32') ? exepath('neovim-node-host.cmd') : exepath('neovim-node-host')
+  let global_modules = get(split(system('npm root -g'), "\n"), 0, '')
+  if v:shell_error || !isdirectory(global_modules)
+    return ''
+  endif
+  return glob(global_modules . '/neovim/bin/cli.js')
 endfunction
 
 function! provider#node#Prog()
@@ -19,18 +43,14 @@ function! provider#node#Require(host) abort
     return
   endif
 
-  if has('win32')
-    let args = provider#node#Prog()
-  else
-    let args = ['node']
-
-    if !empty($NVIM_NODE_HOST_DEBUG)
-      call add(args, '--inspect-brk')
-    endif
+  let args = ['node']
 
-    call add(args , provider#node#Prog())
+  if !empty($NVIM_NODE_HOST_DEBUG) && provider#node#can_inspect()
+    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'