Add tcp feature (#985)

* Add tcp feature

* Update doc

* Update async.vim embed

* Update doc

autoload/lsp.vim

@@ -412,6 +412,16 @@ function! s:ensure_start(buf, server_name, cb) abort
         return
     endif
 
+    if has_key(l:server_info, 'tcp')
+        let l:tcp = l:server_info['tcp'](l:server_info)
+        let l:lsp_id = lsp#client#start({
+            \ 'tcp': l:tcp,
+            \ 'on_stderr': function('s:on_stderr', [a:server_name]),
+            \ 'on_exit': function('s:on_exit', [a:server_name]),
+            \ 'on_notification': function('s:on_notification', [a:server_name]),
+            \ 'on_request': function('s:on_request', [a:server_name]),
+            \ })
+    elseif has_key(l:server_info, 'cmd')
         let l:cmd_type = type(l:server_info['cmd'])
         if l:cmd_type == v:t_list
             let l:cmd = l:server_info['cmd']
@@ -435,6 +445,7 @@ function! s:ensure_start(buf, server_name, cb) abort
             \ 'on_notification': function('s:on_notification', [a:server_name]),
             \ 'on_request': function('s:on_request', [a:server_name]),
             \ })
+    endif
 
     if l:lsp_id > 0
         let l:server['lsp_id'] = l:lsp_id

autoload/lsp/client.vim

@@ -183,15 +183,21 @@ function! s:on_exit(id, status, event) abort
 endfunction
 
 function! s:lsp_start(opts) abort
-    if !has_key(a:opts, 'cmd')
-        return -1
-    endif
-
+    if has_key(a:opts, 'cmd')
         let l:client_id = lsp#utils#job#start(a:opts.cmd, {
             \ 'on_stdout': function('s:on_stdout'),
             \ 'on_stderr': function('s:on_stderr'),
             \ 'on_exit': function('s:on_exit'),
             \ })
+    elseif has_key(a:opts, 'tcp')
+        let l:client_id = lsp#utils#job#connect(a:opts.tcp, {
+            \ 'on_stdout': function('s:on_stdout'),
+            \ 'on_stderr': function('s:on_stderr'),
+            \ 'on_exit': function('s:on_exit'),
+            \ })
+    else
+        return -1
+    endif
 
     let l:ctx = s:create_context(l:client_id, a:opts)
     let l:ctx['id'] = l:client_id

autoload/lsp/utils/job.vim

@@ -1,4 +1,4 @@
-" https://github.com/prabirshrestha/async.vim#d15123af3483350e235397116b554cb37e705130 (dirty)
+" https://github.com/prabirshrestha/async.vim#236debf1a68d69a74f1f6647c273b0477e1ec1bf (dirty)
 "    :AsyncEmbed path=./autoload/lsp/utils/job.vim namespace=lsp#utils#job
 
 " Author: Prabir Shrestha <mail at prabir dot me>
@@ -195,7 +195,11 @@ function! s:job_stop(jobid) abort
               " silently for 'E900: Invalid job id' exception
             endtry
         elseif l:jobinfo.type == s:job_type_vimjob
+            if type(s:jobs[a:jobid].job) == v:t_job
                 call job_stop(s:jobs[a:jobid].job)
+            elseif type(s:jobs[a:jobid].job) == v:t_channel
+                call ch_close(s:jobs[a:jobid].job)
+            endif
         endif
     endif
 endfunction
@@ -306,6 +310,21 @@ function! s:job_pid(jobid) abort
     return 0
 endfunction
 
+function! s:callback_cb(jobid, opts, ch, data) abort
+    if has_key(a:opts, 'on_stdout')
+        call a:opts.on_stdout(a:jobid, split(a:data, "\n", 1), 'stdout')
+    endif
+endfunction
+
+function! s:close_cb(jobid, opts, ch) abort
+    if has_key(a:opts, 'on_exit')
+        call a:opts.on_exit(a:jobid, 'closed', 'exit')
+    endif
+    if has_key(s:jobs, a:jobid)
+        call remove(s:jobs, a:jobid)
+    endif
+endfunction
+
 " public apis {{{
 function! lsp#utils#job#start(cmd, opts) abort
     return s:job_start(a:cmd, a:opts)
@@ -328,6 +347,33 @@ endfunction
 function! lsp#utils#job#pid(jobid) abort
     return s:job_pid(a:jobid)
 endfunction
+
+function! lsp#utils#job#connect(addr, opts) abort
+    let s:jobidseq = s:jobidseq + 1
+    let l:jobid = s:jobidseq
+    let l:retry = 0
+    while l:retry < 5
+        let l:ch = ch_open(a:addr, {'waittime': 1000})
+        call ch_setoptions(l:ch, {
+            \ 'callback': function('s:callback_cb', [l:jobid, a:opts]),
+            \ 'close_cb': function('s:close_cb', [l:jobid, a:opts]),
+            \ 'mode': 'raw',
+        \})
+        if ch_status(l:ch) ==# 'open'
+            break
+        endif
+        sleep 100m
+        let l:retry += 1
+    endwhile
+    let s:jobs[l:jobid] = {
+        \ 'type': s:job_type_vimjob,
+        \ 'opts': a:opts,
+        \ 'job': l:ch,
+        \ 'channel': l:ch,
+        \ 'buffer': ''
+    \}
+    return l:jobid
+endfunction
 " }}}
 
 let &cpo = s:save_cpo

doc/vim-lsp.txt

@@ -220,15 +220,14 @@ on pyls (https://github.com/palantir/python-language-server)
        augroup END
 <
 TCP SERVERS						*vim-lsp-tcp*
-You can use netcat to connect to LSP servers that don't support stdio, but do
-support TCP. Set your cmd to use your netcat executable (`nc` on unix-likes),
-localhost, and your server's port. The Godot game engine uses 6008 as its LSP
-port and godot ftplugins define gdscript or gdscript3 filetype: >
+You can use tcp to connect to LSP servers that don't support stdio. Set host
+and port to tcp. The Godot game engine uses 6008 as its LSP port and godot
+ftplugins define gdscript or gdscript3 filetype: >
 
 	au User lsp_setup 
 	    \ call lsp#register_server({
 	    \     'name': 'godot',
-	    \     'cmd': ["nc", "localhost", "6008"],
+	    \     'tcp': "localhost:6008",
 	    \     'allowlist': ['gdscript3', 'gdscript']
 	    \ })
 >