问在Clojure doseq函数中间暂停？

EN

;; Handler for the POST "/import" route.
(defn- post-import-page
  "Import the file(s) specified in the upload dialog. Checks the page
  title of the import file against existing pages in the database. If
  a page of the same name already exists, asks for confirmation before
  importing."
  [{{file-info "file-info"
     referer   "referer"} :multipart-params :as req}]
  (let [file-vec (if (map? file-info)
                   (conj [] file-info)
                   file-info)]
    (doseq [fm file-vec]
      (let [file-name (:filename fm)
            import-map (files/load-markdown-from-file (:tempfile fm))
            page-title (get-in import-map [:meta :title])
            id-exists? (db/title->page-id page-title)]
        (if id-exists?
          (build-response
            (layout/compose-import-existing-page-warning
              import-map file-name referer) req)
          (do-the-import import-map file-name req))))))

(defn compose-import-existing-page-warning
  "Return a page stating that a page with the same title already exists 
  in the wiki. Ask the user to proceed or cancel the import."
  [import-map file-name referer]
  (short-form-template
    [:div {:class "cwiki-form"}
     (form-to {:enctype      "multipart/form-data"
               :autocomplete "off"}
              [:post "proceed-with-import"]
              (hidden-field "import-map" import-map)
              (hidden-field "file-name" file-name)
              (hidden-field "referer" referer)
              [:p {:class "form-title"} "Page Already Exists"]
              [:div {:class "form-group"}
               [:p (str "A page with the title \"" (get-in import-map [:meta :title])
                        "\" already exists in the wiki.")]
               [:p (str "Click \"Proceed\" to delete the existing page and "
                        "replace it with the contents of the imported file.")]
               [:div {:class "button-bar-container"}
                (submit-button {:id    "proceed-with-import-button"
                                :class "form-button button-bar-item"}
                               "Proceed")
                [:input {:type      "button" :name "cancel-button"
                         :value     "Cancel"
                         :class     "form-button button-bar-item"
                         :autofocus "autofocus"
                         :onclick   "window.history.back();"}]]])]))