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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: 5.8
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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, 1996 Marco Antoniotti and Rick Busdiecker
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11 ;;; 1996 Marco Antoniotti and Rick Campbell
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12 ;;;
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13 ;;; Other authors' names for which this Copyright notice also holds
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14 ;;; may appear later in this file.
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15 ;;;
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16 ;;; Send mail to 'ilisp-request@naggum.no' to be included in the
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17 ;;; ILISP mailing list. 'ilisp@naggum.no' is the general ILISP
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18 ;;; mailing list were bugs and improvements are discussed.
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19 ;;;
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20 ;;; ILISP is freely redistributable under the terms found in the file
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21 ;;; COPYING.
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22
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23
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24 ;;;
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25 ;;; ILISP extensions to emacs lisp
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26 ;;;
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27
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28
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29
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30 ;;;%Utils
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31 ;;; This should be in emacs, but it isn't.
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32 (defun lisp-mem (item list &optional elt=)
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33 "Test to see if ITEM is equal to an item in LIST.
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34 Option comparison function ELT= defaults to equal."
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35 (let ((elt= (or elt= (function equal)))
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36 (done nil))
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37 (while (and list (not done))
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38 (if (funcall elt= item (car list))
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39 (setq done list)
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40 (setq list (cdr list))))
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41 done))
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42
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43
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44
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45 ;;;%%Misc
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46 (defun lisp-memk (item list key)
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47 "Test to see if ITEM is in LIST using KEY on each item in LIST
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48 before comparing it to ITEM."
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49 (lisp-mem item list (function (lambda (x y)
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50 (equal x (funcall key y))))))
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51
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52 ;;; This should be in emacs, but it isn't.
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53 (defun lisp-del (item list &optional test)
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54 "Delete ITEM from LIST using TEST comparison and return the result.
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55 Default test is equal."
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56 (let ((test (or test (function equal)))
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57 (element list)
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58 (prev nil)
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59 (done nil))
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60 (while (and element (not done))
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61 (if (funcall test item (car element))
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62 (progn
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63 (setq done t)
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64 (if prev
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65 (rplacd prev (cdr element))
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66 (setq list (cdr list))))
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67 (setq prev element
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68 element (cdr element))))
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69 list))
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70
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71 ;;;
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72 (defun lisp-last (list)
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73 "Return the last element of LIST."
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74 (while (cdr list)
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75 (setq list (cdr list)))
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76 (car list))
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