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;; -*- Mode: Emacs-Lisp -*-
;; sc-elec.el -- Version 2.3
;; ========== Introduction ==========
;; This file contains sc-electric mode for viewing reference headers.
;; It is loaded automatically by supercite.el when needed.
;; ========== Disclaimer ==========
;; This software is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor accepts
;; responsibility to anyone for the consequences of using it or for
;; whether it serves any particular purpose or works at all, unless he
;; says so in writing.
;; Some of this software was written as part of the supercite author's
;; official duty as an employee of the United States Government and is
;; thus in the public domain. You are free to use that particular
;; software as you wish, but WITHOUT ANY WARRANTY WHATSOEVER. It
;; would be nice, though if when you use any of this code, you give
;; due credit to the author.
;; Other parts of this code were written by other people. Wherever
;; possible, credit to that author, and the copy* notice supplied by
;; the author are included with that code. In all cases, the spirit,
;; if not the letter of the GNU General Public Licence applies.
;; ========== Author (unless otherwise stated) ==========
;; NAME: Barry A. Warsaw USMAIL: Century Computing, Inc.
;; TELE: (301) 593-3330 1014 West Street
;; UUCP: uunet!cen.com!bwarsaw Laurel, MD 20707
;; INET: bwarsaw@cen.com
;; Want to be on the Supercite mailing list?
;;
;; Send articles to:
;; INET: supercite@anthem.nlm.nih.gov
;; UUCP: uunet!anthem.nlm.nih.gov!supercite
;;
;; Send administrivia (additions/deletions to list, etc) to:
;; INET: supercite-request@anthem.nlm.nih.gov
;; UUCP: uunet!anthem.nlm.nih.gov!supercite-request
;;
(provide 'sc-elec)
;; ======================================================================
;; set up vars for major mode
(defconst sc-electric-bufname "*sc-erefs*"
"*Supercite's electric buffer name.")
(defvar sc-electric-mode-hook nil
"*Hook for sc-electric-mode.")
;; ======================================================================
;; sc-electric-mode
(defun sc-electric-mode (&optional arg)
"Quasi major mode for viewing supercite reference headers.
Commands are: \\{sc-electric-mode-map}
Sc-electric-mode is not intended to be run interactively, but rather
accessed through supercite's electric reference feature. See
sc-insert-reference for more details. Optional ARG is the initial
header style to use, unless not supplied or invalid, in which case
sc-preferred-header-style is used."
(let ((gal sc-gal-information)
(sc-eref-style (if arg ;; assume passed arg is okay
arg
(if (and (natnump sc-preferred-header-style)
(sc-valid-index-p sc-preferred-header-style))
sc-preferred-header-style
0))))
(get-buffer-create sc-electric-bufname)
;; set up buffer and enter command loop
(save-excursion
(save-window-excursion
(pop-to-buffer sc-electric-bufname)
(kill-all-local-variables)
(setq sc-gal-information gal
buffer-read-only t
mode-name "Supercite-Electric-References"
major-mode 'sc-electric-mode)
(use-local-map sc-electric-mode-map)
(sc-eref-show sc-eref-style)
(run-hooks 'sc-electric-mode-hook)
(recursive-edit)
))
(if sc-eref-style
(condition-case nil
(eval (nth sc-eref-style sc-rewrite-header-list))
(error nil)
))
;; now restore state
(kill-buffer sc-electric-bufname)
))
;; ======================================================================
;; functions for electric mode
(defun sc-eref-index (index)
"Check INDEX to be sure it is a valid index into sc-rewrite-header-list.
If sc-electric-circular-p is non-nil, then list is considered circular
so that movement across the ends of the list wraparound."
(let ((last (1- (length sc-rewrite-header-list))))
(cond ((sc-valid-index-p index) index)
((< index 0)
(if sc-electric-circular-p last
(progn (error "No preceding reference headers in list.") 0)))
((> index last)
(if sc-electric-circular-p 0
(progn (error "No following reference headers in list.") last)))
)
))
(defun sc-eref-show (index)
"Show reference INDEX in sc-rewrite-header-list."
(setq sc-eref-style (sc-eref-index index))
(save-excursion
(set-buffer sc-electric-bufname)
(let ((ref (nth sc-eref-style sc-rewrite-header-list))
(buffer-read-only nil))
(erase-buffer)
(goto-char (point-min))
(condition-case err
(progn
(set-mark (point-min))
(eval ref)
(message "Showing reference header %d." sc-eref-style)
(goto-char (point-max))
)
(void-function
(progn (message
"Symbol's function definition is void: %s (Header %d)"
(symbol-name (car (cdr err)))
sc-eref-style)
(beep)
))
))))
;; ======================================================================
;; interactive commands
(defun sc-eref-next ()
"Display next reference in other buffer."
(interactive)
(sc-eref-show (1+ sc-eref-style)))
(defun sc-eref-prev ()
"Display previous reference in other buffer."
(interactive)
(sc-eref-show (1- sc-eref-style)))
(defun sc-eref-setn ()
"Set reference header selected as preferred."
(interactive)
(setq sc-preferred-header-style sc-eref-style)
(message "Preferred reference style set to header %d." sc-eref-style))
(defun sc-eref-goto (refnum)
"Show reference style indexed by REFNUM.
If REFNUM is an invalid index, don't go to that reference and return
nil."
(interactive "NGoto Reference: ")
(if (sc-valid-index-p refnum)
(sc-eref-show refnum)
(error "Invalid reference: %d. (Range: [%d .. %d])"
refnum 0 (1- (length sc-rewrite-header-list)))
))
(defun sc-eref-jump ()
"Set reference header to preferred header."
(interactive)
(sc-eref-show sc-preferred-header-style))
(defun sc-eref-abort ()
"Exit from electric reference mode without inserting reference."
(interactive)
(setq sc-eref-style nil)
(exit-recursive-edit))
(defun sc-eref-exit ()
"Exit from electric reference mode and insert selected reference."
(interactive)
(exit-recursive-edit))
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