use --preview to enable preview features

Author: sumneko

.vscode/settings.json

@@ -1,6 +1,7 @@
 // Just some comment
 {
     "Lua.misc.parameters": [
+        "--preview",
         "--develop=true",
         "--dbgport=11413",
     ]

script/config/config.lua

@@ -208,7 +208,7 @@ local Template = {
     ['Lua.hint.arrayIndex']                 = Type.Boolean >> 'Auto',
     ['Lua.window.statusBar']                = Type.Boolean >> true,
     ['Lua.window.progressBar']              = Type.Boolean >> true,
-    ['Lua.format.enable']                   = Type.Boolean >> false,
+    ['Lua.format.enable']                   = Type.Boolean >> true,
     ['Lua.IntelliSense.traceLocalSet']      = Type.Boolean >> false,
     ['Lua.IntelliSense.traceReturn']        = Type.Boolean >> false,
     ['Lua.IntelliSense.traceBeSetted']      = Type.Boolean >> false,

script/global.d.lua

@@ -33,3 +33,9 @@ FOOTPRINT = false
 ---trace rpc, use command line: --rpclog=true
 ---@type boolean
 RPCLOG = false
+
+--enable preview features.
+--
+--the current version is `formatting`
+---@type boolean
+PREVIEW = false

script/provider/provider.lua

@@ -61,6 +61,9 @@ m.attributes = {}
 function m.register(method)
     return function (attrs)
         m.attributes[method] = attrs
+        if attrs.preview and not PREVIEW then
+            return
+        end
         if attrs.capability then
             cap.filling(attrs.capability)
         end
@@ -999,6 +1002,7 @@ m.register 'textDocument/formatting' {
     capability = {
         documentFormattingProvider = true,
     },
+    preview = true,
     ---@async
     function(params)
         local uri = files.getRealUri(params.textDocument.uri)
@@ -1036,6 +1040,7 @@ m.register 'textDocument/rangeFormatting' {
     capability = {
         documentRangeFormattingProvider = true,
     },
+    preview = true,
     ---@async
     function(params)
         local uri = files.getRealUri(params.textDocument.uri)