[Feature] add linter support (#982)

lua/core/linter.lua

@@ -0,0 +1,33 @@
+local M = {}
+
+M.setup = function()
+  if O.lint_on_save then
+    require("lv-utils").define_augroups {
+      autolint = {
+        {
+          "BufWritePost",
+          "<buffer>",
+          ":silent lua require('lint').try_lint()",
+        },
+        {
+          "BufEnter",
+          "<buffer>",
+          ":silent lua require('lint').try_lint()",
+        },
+      },
+    }
+  end
+end
+
+local status_ok, linter = pcall(require, "lint")
+if not status_ok then
+  return
+end
+
+if not O.lint_on_save then
+  vim.cmd [[if exists('#autolint#BufWritePost')
+	:autocmd! autolint
+	endif]]
+end
+
+return M