Elisp utilities (mostly imported from FUEL).

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+;;; geiser-base.el --- shared bits
+
+;; Copyright (C) 2009  Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Keywords: languages, tools
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Settings and vars shared by all geiser modules, including little
+;; utilities and emacsen compatibility bits.
+
+;;; Code:
+
+
+;;; Versioning:
+
+(defconst geiser-version-major 0
+  "Geiser's major version number.")
+(defconst geiser-version-minor 1
+  "Geiser's minor version number.")
+
+(defun geiser-version-string ()
+  "Geiser's version as a string."
+  (format "%s.%s" geiser-version-major geiser-version-minor))
+
+(defun geiser-version ()
+  "Echoes Geiser's version."
+  (interactive)
+  (message "Geiser %s" (geiser-version-string)))
+
+
+;;; Customization group:
+
+(defgroup geiser nil
+  "Geiser framework for Guile-Emacs interaction."
+  :group 'languages)
+
+
+;;; Emacs compatibility:
+
+(eval-after-load "ring"
+  '(when (not (fboundp 'ring-member))
+     (defun ring-member (ring item)
+       (catch 'found
+         (dotimes (ind (ring-length ring) nil)
+           (when (equal item (ring-ref ring ind))
+             (throw 'found ind)))))))
+
+(when (not (fboundp 'completion-table-dynamic))
+  (defun completion-table-dynamic (fun)
+    (lexical-let ((fun fun))
+      (lambda (string pred action)
+        (with-current-buffer (let ((win (minibuffer-selected-window)))
+                               (if (window-live-p win) (window-buffer win)
+                                 (current-buffer)))
+          (complete-with-action action (funcall fun string) string pred))))))
+
+(when (not (fboundp 'looking-at-p))
+  (defsubst looking-at-p (regexp)
+    (let ((inhibit-changing-match-data t))
+      (looking-at regexp))))
+
+
+;;; Utilities:
+
+(defun geiser--shorten-str (str len &optional sep)
+  (let ((str-len (length str)))
+    (if (<= str-len len)
+        str
+      (let* ((sep (or sep " ... "))
+             (sep-len (length sep))
+             (prefix-len (/ (- str-len sep-len) 2))
+             (prefix (substring str 0 prefix-len))
+             (suffix (substring str (- str-len prefix-len))))
+        (format "%s%s%s" prefix sep suffix)))))
+
+(defun geiser--region-to-string (begin &optional end)
+  (let ((end (or end (point))))
+    (when (< begin end)
+      (let* ((str (buffer-substring-no-properties begin end))
+             (pieces (split-string str nil t)))
+        (mapconcat 'identity pieces " ")))))
+
+(provide 'geiser-base)
+;;; geiser-base.el ends here