elisp/geiser-base.el

   1 ;;; geiser-base.el --- shared bits
   2
   3 ;; Copyright (C) 2009, 2010, 2012  Jose Antonio Ortega Ruiz
   4
   5 ;; This program is free software; you can redistribute it and/or
   6 ;; modify it under the terms of the Modified BSD License. You should
   7 ;; have received a copy of the license along with this program. If
   8 ;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
   9
  10 \f
  11
  12 ;; Settings and vars shared by all geiser modules, including little
  13 ;; utilities and emacsen compatibility bits.
  14
  15 ;;; Emacs compatibility:
  16
  17 (eval-after-load "ring"
  18   '(when (not (fboundp 'ring-member))
  19      (defun ring-member (ring item)
  20        (catch 'found
  21          (dotimes (ind (ring-length ring) nil)
  22            (when (equal item (ring-ref ring ind))
  23              (throw 'found ind)))))))
  24
  25 (when (not (fboundp 'looking-at-p))
  26   (defsubst looking-at-p (regexp)
  27     (let ((inhibit-changing-match-data t))
  28       (looking-at regexp))))
  29
  30 \f
  31 ;;; Utilities:
  32
  33 (defsubst geiser--chomp (str)
  34   (if (string-match-p ".*\n$" str) (substring str 0 -1) str))
  35
  36 (defun geiser--shorten-str (str len &optional sep)
  37   (let ((str-len (length str)))
  38     (if (<= str-len len)
  39         str
  40       (let* ((sep (or sep " ... "))
  41              (sep-len (length sep))
  42              (prefix-len (/ (- str-len sep-len) 2))
  43              (prefix (substring str 0 prefix-len))
  44              (suffix (substring str (- str-len prefix-len))))
  45         (format "%s%s%s" prefix sep suffix)))))
  46
  47 (defun geiser--region-to-string (begin &optional end)
  48   (let ((end (or end (point))))
  49     (when (< begin end)
  50       (let* ((str (buffer-substring-no-properties begin end))
  51              (pieces (split-string str nil t)))
  52         (mapconcat 'identity pieces " ")))))
  53
  54 (defun geiser--insert-with-face (str face)
  55   (let ((p (point)))
  56     (insert str)
  57     (put-text-property p (point) 'face face)))
  58
  59
  60 (defmacro geiser--save-msg (&rest body)
  61   (let ((msg (make-symbol "msg")))
  62     `(let ((,msg (current-message)))
  63        ,@body
  64        (message ,msg))))
  65
  66 (put 'geiser--save-msg 'lisp-indent-function 0)
  67
  68 (defun geiser--del-dups (lst)
  69   (let (result)
  70     (dolist (e lst (nreverse result))
  71       (unless (member e result) (push e result)))))
  72
  73 (defsubst geiser--symbol-at-point ()
  74   (let ((thing (thing-at-point 'symbol)))
  75     (and thing (make-symbol thing))))
  76
  77 \f
  78 (provide 'geiser-base)