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From: Teemu Likonen <tlikonen@iki.fi>
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Subject: Pretty-printing lists (adding newlines and indent)
Date: Thu, 31 Dec 2009 17:43:55 +0200
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Is there an easy way to pretty-print lists in Emacs Lisp? I mean adding
newlines and indents like in the inferior-emacs-lisp-mode (M-x ielm):

    ELISP> '((a1 a2) (b1 (1 2 3 4 5)) (c1 c2))
    ((a1 a2)
     (b1
      (1 2 3 4 5))
     (c1 c2))    

I have a potentially big multi-level hierarchical list data which I'd
like to PRIN1 to a buffer. Having the whole list as a single line is
ugly and unreadable.