如何在clojure中获得`doc`函数的输出？

Question

我试图保存doc函数的输出,例如:

user> (def doc-str-split (doc str/split))
-------------------------
clojure.string/split
([s re] [s re limit])
  Splits string on a regular expression.  Optional argument limit is
  the maximum number of splits. Not lazy. Returns vector of the splits.
#'user/doc-str-split

user> doc-str-split
nil
user> 

但是,我得到nil了doc-str-split.我试图让type与的doc输出:

user> (type (doc str/split))
-------------------------
clojure.string/split
([s re] [s re limit])
  Splits string on a regular expression.  Optional argument limit is
  the maximum number of splits. Not lazy. Returns vector of the splits.
nil

仍然得到一个nil.如何保存doc功能的输出？

Answer 1

您可以使用with-out-str捕获输出,如下所示:

user> (def doc-str-split (with-out-str (doc str/split)))
#'user/doc-str-split

user> (println doc-str-split)
-------------------------
clojure.string/split
([s re] [s re limit])
  Splits string on a regular expression.  Optional argument limit is
  the maximum number of splits. Not lazy. Returns vector of the splits.

nil

user> (type (with-out-str (doc str/split)))
java.lang.String