Editing Pretty-printing (section)

===Lisp pretty-printer===
An early example of pretty-printing was [[Bill Gosper]]'s "GRINDEF" (''i.e.'' 'grind function') program (''c.'' 1967), which used [[combinatorial optimization|combinatorial search]] with pruning to format [[Lisp programming language|LISP]] programs. Early versions operated on the executable (list structure) form of the Lisp program and were oblivious to the special meanings of various functions. Later versions had special read conventions for incorporating non-executable comments and also for preserving [[read macro]]s in unexpanded form. They also allowed special indentation conventions for special functions such as <code>if</code>.<ref>Ira Goldstein, "Pretty Printing : Converting List to Linear Structure", Artificial Intelligence Memo 279, Massachusetts Institute of Technology, February 1973. [http://www.softwarepreservation.org/projects/LISP/MIT/AIM-279-Goldstein-Pretty_Printing.pdf/view full text]</ref><ref>Richard C. Waters, "Using the new common Lisp pretty printer", ''ACM SIGPLAN Lisp Pointers'' '''5''':2:27-34, April–June 1992. [https://web.archive.org/web/20170706120420/ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-1102.pdf full text]</ref> The term "grind" was used in some Lisp circles as a synonym for pretty-printing.<ref>[[Jargon File]], ''s.v.'' grind</ref>