misc/fuel/fuel-base.el

   1 ;;; fuel-base.el --- Basic FUEL support code
   2
   3 ;; Copyright (C) 2008 Jose Antonio Ortega Ruiz
   4 ;; See http://factorcode.org/license.txt for BSD license.
   5
   6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
   7 ;; Keywords: languages
   8
   9 ;;; Commentary:
  10
  11 ;; Basic definitions likely to be used by all FUEL modules.
  12
  13 ;;; Code:
  14
  15 (defconst fuel-version "1.0")
  16
  17 ;;;###autoload
  18 (defsubst fuel-version ()
  19   "Echoes FUEL's version."
  20   (interactive)
  21   (message "FUEL %s" fuel-version))
  22
  23 \f
  24 ;;; Customization:
  25
  26 ;;;###autoload
  27 (defgroup fuel nil
  28   "Factor's Ultimate Emacs Library."
  29   :group 'languages)
  30
  31 \f
  32 ;;; Emacs compatibility:
  33
  34 (eval-after-load "ring"
  35   '(when (not (fboundp 'ring-member))
  36      (defun ring-member (ring item)
  37        (catch 'found
  38          (dotimes (ind (ring-length ring) nil)
  39            (when (equal item (ring-ref ring ind))
  40              (throw 'found ind)))))))
  41
  42 (when (not (fboundp 'completion-table-dynamic))
  43   (defun completion-table-dynamic (fun)
  44     (lexical-let ((fun fun))
  45       (lambda (string pred action)
  46         (with-current-buffer (let ((win (minibuffer-selected-window)))
  47                                (if (window-live-p win) (window-buffer win)
  48                                  (current-buffer)))
  49           (complete-with-action action (funcall fun string) string pred))))))
  50
  51 (when (not (fboundp 'looking-at-p))
  52   (defsubst looking-at-p (regexp)
  53     (let ((inhibit-changing-match-data t))
  54       (looking-at regexp))))
  55
  56 \f
  57 ;;; Utilities
  58
  59 (defun fuel--shorten-str (str len)
  60   (let ((sl (length str)))
  61     (if (<= sl len) str
  62       (let* ((sep " ... ")
  63              (sepl (length sep))
  64              (segl (/ (- len sepl) 2)))
  65         (format "%s%s%s"
  66                 (substring str 0 segl)
  67                 sep
  68                 (substring str (- sl segl)))))))
  69
  70 (defun fuel--shorten-region (begin end len)
  71   (fuel--shorten-str (mapconcat 'identity
  72                                 (split-string (buffer-substring begin end) nil t)
  73                                 " ")
  74                      len))
  75
  76 (defsubst fuel--region-to-string (begin &optional end)
  77   (let ((end (or end (point))))
  78     (if (< begin end)
  79         (mapconcat 'identity
  80                    (split-string (buffer-substring-no-properties begin end)
  81                                  nil
  82                                  t)
  83                    " ")
  84       "")))
  85
  86 (defsubst empty-string-p (str) (equal str ""))
  87
  88 (defun fuel--string-prefix-p (prefix str)
  89   (and (>= (length str) (length prefix))
  90        (string= (substring-no-properties str 0 (length prefix))
  91                 (substring-no-properties prefix))))
  92
  93 (defun fuel--respecting-message (format &rest format-args)
  94   "Display TEXT as a message, without hiding any minibuffer contents."
  95   (let ((text (format " [%s]" (apply #'format format format-args))))
  96     (if (minibuffer-window-active-p (minibuffer-window))
  97         (minibuffer-message text)
  98       (message "%s" text))))
  99
 100 (provide 'fuel-base)
 101 ;;; fuel-base.el ends here