refactoring to use config options from lua module

lua/lib/config.lua

@@ -0,0 +1,33 @@
+local api = vim.api
+
+local function get(var, fallback)
+    if vim.api.nvim_call_function('exists', { var }) == 1 then
+        return vim.api.nvim_get_var(var)
+    else
+        return fallback
+    end
+end
+
+local HAS_DEV_ICONS = api.nvim_call_function('exists', { "*WebDevIconsGetFileTypeSymbol" }) == 1
+
+local SHOW_FOLDER_ICON = get('lua_tree_show_folders', 1) == 1
+
+local SHOW_GIT_ICON = get('lua_tree_show_git_icons', 1) == 1
+
+local colors = {
+    red = get('terminal_color_1', 'Red'),
+    green = get('terminal_color_2', 'Green'),
+    yellow = get('terminal_color_3', 'Yellow'),
+    blue = get('terminal_color_4', 'Blue'),
+    purple = get('terminal_color_5', 'Purple'),
+    cyan = get('terminal_color_6', 'Cyan'),
+    orange = get('terminal_color_11', 'Orange'),
+    dark_red = get('terminal_color_9', 'DarkRed'),
+}
+return {
+    SHOW_FOLDER_ICON = SHOW_FOLDER_ICON,
+    HAS_DEV_ICONS = HAS_DEV_ICONS,
+    SHOW_GIT_ICON = SHOW_GIT_ICON,
+    colors = colors
+}
+