feature: completion for config function

lua/laravel/null_ls/completion/config.lua

@@ -0,0 +1,29 @@
+local api = require "laravel.api"
+
+return function(done, should_quote)
+  local resp = api.tinker_execute "json_encode(array_keys(Arr::dot(Config::all())));"
+  if resp:failed() then
+    return
+  end
+
+  local configs = vim.json.decode(resp:prettyContent())
+  if configs == nil then
+    return
+  end
+
+  local candidates = {}
+
+  for _, config in pairs(configs) do
+    local insert = config
+    if should_quote then
+      insert = string.format("'%s'", config)
+    end
+    table.insert(candidates, {
+      label = string.format("%s (route)", config),
+      insertText = insert,
+      kind = vim.lsp.protocol.CompletionItemKind["Value"],
+    })
+  end
+
+  done { { items = candidates, isIncomplete = false } }
+end

lua/laravel/null_ls/completion/init.lua

@@ -3,6 +3,7 @@ local M = {}
 local completions = {
   view = require "laravel.null_ls.completion.view",
   route = require "laravel.null_ls.completion.route",
+  config = require "laravel.null_ls.completion.config",
 }
 
 local function get_function_node(param_node)