Fix: do not require lspkind if not configured

lua/outline/symbols.lua

@@ -45,23 +45,10 @@ for k, v in pairs(M.kinds) do
   M.str_to_kind[v] = k
 end
 
----@return table
-local function get_lspkind()
-    local has_lspkind, lspkind = pcall(require, 'lspkind')
-    if has_lspkind then
-      return lspkind
-    end
-    vim.notify(
-      '[outline]: icon_source set to lspkind but failed to require lspkind!',
-      vim.log.levels.ERROR
-    )
-    -- return lspkind stub
-    return {
-      symbolic = function(kind, opts) return '' end
-    }
-end
-
-local lspkind = get_lspkind()
+-- use a stub if lspkind is missing or not configured
+local lspkind = {
+  symbolic = function(kind, opts) return '' end
+}
 
 ---@param kind string|integer
 ---@param bufnr integer
@@ -83,14 +70,26 @@ function M.icon_from_kind(kind, bufnr)
     end
   end
 
-  if cfg.o.symbols.icon_source == 'lspkind' then
-    local icon = lspkind.symbolic(kindstr, { with_text = false })
-    if icon and icon ~= '' then
-      return icon
-    end
+  local icon = lspkind.symbolic(kindstr, { with_text = false })
+  if icon and icon ~= '' then
+    return icon
   end
 
   return cfg.o.symbols.icons[kindstr].icon
 end
 
+function M.setup()
+  if cfg.o.symbols.icon_source == 'lspkind' then
+    local has_lspkind, _lspkind = pcall(require, 'lspkind')
+    if has_lspkind then
+      lspkind = _lspkind
+    else
+      vim.notify(
+        '[outline]: icon_source set to lspkind but failed to require lspkind!',
+        vim.log.levels.ERROR
+      )
+    end
+  end
+end
+
 return M