fix(remote): report on missing wait commands, typecheck lua results

Clean up lint errors, too

4 files changed, 37 insertions, 34 deletions

diff --git a/runtime/doc/remote.txt b/runtime/doc/remote.txt
index dd5d44387d..b8991be738 100644
--- a/runtime/doc/remote.txt
+++ b/runtime/doc/remote.txt
@@ -83,7 +83,7 @@ You can not put options there!
 
 
 ==============================================================================
-2. Missing functionality				*clientserver-missing*
+2. Missing functionality			*E5600* *clientserver-missing*
 
 Vim supports additional functionality in clientserver that's not yet
 implemented in Nvim. In particular, none of the 'wait' variants are supported
diff --git a/runtime/lua/vim/_editor.lua b/runtime/lua/vim/_editor.lua
index 869a2706ac..030c3b40e8 100644
--- a/runtime/lua/vim/_editor.lua
+++ b/runtime/lua/vim/_editor.lua
@@ -638,56 +638,39 @@ end
 
 function vim._cs_remote(rcid, args)
   local f_silent = false
-  local f_wait = false
   local f_tab = false
 
   local subcmd = string.sub(args[1],10)
 
-  if subcmd == '' then
-    -- no flags to set
-  elseif subcmd == 'tab' then
+  if subcmd == 'tab' then
     f_tab = true
   elseif subcmd == 'silent' then
     f_silent = true
-  elseif subcmd == 'wait' then
-    f_wait = true
-  elseif subcmd == 'wait-silent' then
-    f_wait = true
-    f_silent = true
-  elseif subcmd == 'tab-wait' then
-    f_tab = true
-    f_wait = true
+  elseif subcmd == 'wait' or subcmd == 'wait-silent' or subcmd == 'tab-wait' or subcmd == 'tab-wait-silent' then
+    return { errmsg = 'E5600: Wait commands not yet implemented in nvim' }
   elseif subcmd == 'tab-silent' then
     f_tab = true
     f_silent = true
-  elseif subcmd == 'tab-wait-silent' then
-    f_tab = true
-    f_wait = true
-    f_silent = true
   elseif subcmd == 'send' then
     if rcid == 0 then
-      vim.cmd('echoerr "E247: Remote server does not exist. Send failed."')
-      return
+      return { errmsg = 'E247: Remote server does not exist. Send failed.' }
     end
     vim.fn.rpcrequest(rcid, 'nvim_input', args[2])
     return { should_exit = true, tabbed = false }
   elseif subcmd == 'expr' then
     if rcid == 0 then
-      vim.cmd('echoerr "E247: Remote server does not exist. Send expression failed."')
-      return
+      return { errmsg = 'E247: Remote server does not exist. Send expression failed.' }
     end
-    vim.fn.rpcrequest(rcid, 'nvim_eval', args[2])
+    print(vim.fn.rpcrequest(rcid, 'nvim_eval', args[2]))
     return { should_exit = true, tabbed = false }
-  else
-    vim.cmd('echoerr "Unknown option argument: ' .. args[1] .. '"')
-    return
+  elseif subcmd ~= '' then
+    return { errmsg='Unknown option argument: ' .. args[1] }
   end
 
   if rcid == 0 then
     if not f_silent then
       vim.cmd('echohl WarningMsg | echomsg "E247: Remote server does not exist. Editing locally" | echohl None')
     end
-    should_exit = false
   else
     local command = {}
     if f_tab then table.insert(command, 'tab') end
diff --git a/src/nvim/main.c b/src/nvim/main.c
index a3588ac5df..eb60d51b9b 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -816,8 +816,10 @@ static void handle_remote_client(mparm_T *params, int remote_args,
     rvobj.type = kObjectTypeDictionary;
     CallbackReader on_data = CALLBACK_READER_INIT;
     const char *error = NULL;
-    uint64_t rc_id = server_addr == NULL ? 0 : channel_connect(false,
-                     server_addr, true, on_data, 50, &error);
+    uint64_t rc_id = 0;
+    if (server_addr != NULL) {
+      rc_id = channel_connect(false, server_addr, true, on_data, 50, &error);
+    }
 
     Boolean should_exit = true;
     Boolean tabbed;
@@ -848,17 +850,33 @@ static void handle_remote_client(mparm_T *params, int remote_args,
       rvobj.data.dictionary = o.data.dictionary;
     } else {
       mch_errmsg("vim._cs_remote returned unexpected value\n");
-      os_exit(3);
+      os_exit(2);
     }
 
     for (size_t i = 0; i < rvobj.data.dictionary.size ; i++) {
-      if (strcmp(rvobj.data.dictionary.items[i].key.data, "tabbed") == 0) {
-        // should we check items[i].value.type here?
+      if (strcmp(rvobj.data.dictionary.items[i].key.data, "errmsg") == 0) {
+        if (rvobj.data.dictionary.items[i].value.type != kObjectTypeString) {
+          mch_errmsg("vim._cs_remote returned an unexpected type for 'errmsg'\n");
+          os_exit(2);
+        }
+        mch_errmsg(rvobj.data.dictionary.items[i].value.data.string.data);
+        mch_errmsg("\n");
+        os_exit(2);
+      } else if (strcmp(rvobj.data.dictionary.items[i].key.data, "tabbed") == 0) {
+        if (rvobj.data.dictionary.items[i].value.type != kObjectTypeBoolean) {
+          mch_errmsg("vim._cs_remote returned an unexpected type for 'tabbed'\n");
+          os_exit(2);
+        }
         tabbed = rvobj.data.dictionary.items[i].value.data.boolean;
       } else if (strcmp(rvobj.data.dictionary.items[i].key.data, "should_exit") == 0) {
+        if (rvobj.data.dictionary.items[i].value.type != kObjectTypeBoolean) {
+          mch_errmsg("vim._cs_remote returned an unexpected type for 'should_exit'\n");
+          os_exit(2);
+        }
         should_exit = rvobj.data.dictionary.items[i].value.data.boolean;
       }
     }
+    api_free_object(o);
 
     if (should_exit) {
       os_exit(0);
diff --git a/test/functional/core/remote_spec.lua b/test/functional/core/remote_spec.lua
index e86d15ec69..602a5a71eb 100644
--- a/test/functional/core/remote_spec.lua
+++ b/test/functional/core/remote_spec.lua
@@ -9,7 +9,6 @@ local insert = helpers.insert
 local meths = helpers.meths
 local new_argv = helpers.new_argv
 local neq = helpers.neq
-local run = helpers.run
 local set_session = helpers.set_session
 local spawn = helpers.spawn
 local tmpname = helpers.tmpname
@@ -38,7 +37,7 @@ describe('Remote', function()
       server:close()
     end)
 
-    function run_remote(...)
+    local function run_remote(...)
       set_session(server)
       local addr = funcs.serverlist()[1]
       local client_argv = new_argv({args={'--server', addr, ...}})
@@ -121,7 +120,7 @@ describe('Remote', function()
       -- to wait for the remote instance to exit and calling jobwait blocks
       -- the event loop. If the server event loop is blocked, it can't process
       -- our incoming --remote calls.
-      local client_starter = clear()
+      clear()
       local bogus_job_id = funcs.jobstart(bogus_argv)
       eq({2}, funcs.jobwait({bogus_job_id}))
     end
@@ -136,5 +135,8 @@ describe('Remote', function()
     it('expr without server', function()
       run_and_check_exit_code('--remote-expr', 'setline(1, "Yo")')
     end)
+    it('wait subcommand', function()
+      run_and_check_exit_code('--remote-wait', fname)
+    end)
   end)
 end)