add .luarc.json for lua-language-server and fix a couple of nits (#1296)

Author: alex-courtis

.luarc.json

@@ -0,0 +1,13 @@
+{
+	"$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
+	"diagnostics": {
+		"globals": {
+			"vim": true
+		},
+		"disable": {
+			"lowercase-global": true,
+			"missing-parameter": true
+		}
+	}
+}
+

lua/nvim-tree/diagnostics.lua

@@ -92,7 +92,7 @@ local function from_coc()
 
   for bufname, severity_list in pairs(diagnostics) do
     if not buffer_severity[bufname] then
-      local severity = math.min(unpack(severity_list))
+      local severity = math.min(table.unpack(severity_list))
       buffer_severity[bufname] = severity
     end
   end

lua/nvim-tree/explorer/explore.lua

@@ -32,11 +32,11 @@ local function populate_children(handle, cwd, node, status)
     then
       local child = nil
       if t == "directory" and uv.fs_access(abs, "R") then
-        child = builders.folder(node, abs, name, status, node_ignored)
+        child = builders.folder(node, abs, name)
       elseif t == "file" then
-        child = builders.file(node, abs, name, status, node_ignored)
+        child = builders.file(node, abs, name)
       elseif t == "link" then
-        local link = builders.link(node, abs, name, status, node_ignored)
+        local link = builders.link(node, abs, name)
         if link.link_to ~= nil then
           child = link
         end

lua/nvim-tree/explorer/reload.lua

@@ -48,11 +48,11 @@ function M.reload(node, status)
       child_names[abs] = true
       if not nodes_by_path[abs] then
         if t == "directory" and uv.fs_access(abs, "R") then
-          table.insert(node.nodes, builders.folder(node, abs, name, status, node_ignored))
+          table.insert(node.nodes, builders.folder(node, abs, name))
         elseif t == "file" then
-          table.insert(node.nodes, builders.file(node, abs, name, status, node_ignored))
+          table.insert(node.nodes, builders.file(node, abs, name))
         elseif t == "link" then
-          local link = builders.link(node, abs, name, status, node_ignored)
+          local link = builders.link(node, abs, name)
           if link.link_to ~= nil then
             table.insert(node.nodes, link)
           end