rework(preview): Ask providers for hover info

Now lsp checks if client supports hover
Addresses #82

lua/symbols-outline/providers/init.lua

@@ -1,34 +1,35 @@
 local M = {}
 
 local providers = {
-    'symbols-outline/providers/nvim-lsp',
-    'symbols-outline/providers/coc',
-    'symbols-outline/providers/markdown'
+	"symbols-outline/providers/nvim-lsp",
+	"symbols-outline/providers/coc",
+	"symbols-outline/providers/markdown",
 }
 
-local current_provider;
+_G._symbols_outline_current_provider = nil
 
 function M.has_provider()
-    local ret = false;
-    for _, value in ipairs(providers) do
-       local provider = require(value)
-       if provider.should_use_provider(0) then
-           ret = true;
-           break
-       end
-    end
-    return ret
+	local ret = false
+	for _, value in ipairs(providers) do
+		local provider = require(value)
+		if provider.should_use_provider(0) then
+			ret = true
+			break
+		end
+	end
+	return ret
 end
 
 ---@param on_symbols function
 function M.request_symbols(on_symbols)
-   for _, value in ipairs(providers) do
-       local provider = require(value)
-       if provider.should_use_provider(0) then
-           provider.request_symbols(on_symbols)
-           break
-       end
-    end
+	for _, value in ipairs(providers) do
+		local provider = require(value)
+		if provider.should_use_provider(0) then
+			_G._symbols_outline_current_provider = provider
+			provider.request_symbols(on_symbols)
+			break
+		end
+	end
 end
 
 return M