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1 ;;; -*- Mode: Emacs-Lisp -*-
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2
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3 ;;; ilisp-el.el --
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4
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5 ;;; This file is part of ILISP.
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6 ;;; Version: 5.7
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7 ;;;
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8 ;;; Copyright (C) 1990, 1991, 1992, 1993 Chris McConnell
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9 ;;; 1993, 1994 Ivan Vasquez
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10 ;;; 1994, 1995 Marco Antoniotti and Rick Busdiecker
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11 ;;;
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12 ;;; Other authors' names for which this Copyright notice also holds
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13 ;;; may appear later in this file.
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14 ;;;
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15 ;;; Send mail to 'ilisp-request@lehman.com' to be included in the
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16 ;;; ILISP mailing list. 'ilisp@lehman.com' is the general ILISP
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17 ;;; mailing list were bugs and improvements are discussed.
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18 ;;;
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19 ;;; ILISP is freely redistributable under the terms found in the file
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20 ;;; COPYING.
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21
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22
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23 ;;;
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24 ;;; ILISP extensions to emacs lisp
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25 ;;;
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26
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27
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28
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29 ;;;%Utils
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30 ;;; This should be in emacs, but it isn't.
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31 (defun lisp-mem (item list &optional elt=)
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32 "Test to see if ITEM is equal to an item in LIST.
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33 Option comparison function ELT= defaults to equal."
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34 (let ((elt= (or elt= (function equal)))
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35 (done nil))
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36 (while (and list (not done))
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37 (if (funcall elt= item (car list))
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38 (setq done list)
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39 (setq list (cdr list))))
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40 done))
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41
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42
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43
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44 ;;;%%Misc
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45 (defun lisp-memk (item list key)
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46 "Test to see if ITEM is in LIST using KEY on each item in LIST
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47 before comparing it to ITEM."
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48 (lisp-mem item list (function (lambda (x y)
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49 (equal x (funcall key y))))))
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50
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51 ;;; This should be in emacs, but it isn't.
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52 (defun lisp-del (item list &optional test)
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53 "Delete ITEM from LIST using TEST comparison and return the result.
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54 Default test is equal."
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55 (let ((test (or test (function equal)))
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56 (element list)
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57 (prev nil)
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58 (done nil))
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59 (while (and element (not done))
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60 (if (funcall test item (car element))
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61 (progn
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62 (setq done t)
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63 (if prev
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64 (rplacd prev (cdr element))
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65 (setq list (cdr list))))
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66 (setq prev element
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67 element (cdr element))))
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68 list))
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69
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70 ;;;
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71 (defun lisp-last (list)
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72 "Return the last element of LIST."
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73 (while (cdr list)
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74 (setq list (cdr list)))
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75 (car list))
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