mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-05 08:53:45 +00:00
270 lines
9.9 KiB
EmacsLisp
270 lines
9.9 KiB
EmacsLisp
;;; dabbrev.el --- dynamic abbreviation package for GNU Emacs.
|
|
|
|
;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
|
|
|
|
;; Last-Modified: 16 Mar 1992
|
|
;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
|
|
|
|
;; Maintainer: FSF
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs 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 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
; DABBREVS - "Dynamic abbreviations" hack, originally written by Don Morrison
|
|
; for Twenex Emacs. Converted to mlisp by Russ Fish. Supports the table
|
|
; feature to avoid hitting the same expansion on re-expand, and the search
|
|
; size limit variable. Bugs fixed from the Twenex version are flagged by
|
|
; comments starting with ;;; .
|
|
;
|
|
; converted to Emacs Lisp by Spencer Thomas.
|
|
; Thoroughly cleaned up by Richard Stallman.
|
|
;
|
|
; If anyone feels like hacking at it, Bob Keller (Keller@Utah-20) first
|
|
; suggested the beast, and has some good ideas for its improvement, but
|
|
; doesn't know TECO (the lucky devil...). One thing that should definitely
|
|
; be done is adding the ability to search some other buffer(s) if you can?t
|
|
; find the expansion you want in the current one.
|
|
|
|
;;; Code:
|
|
|
|
;; (defun dabbrevs-help ()
|
|
;; "Give help about dabbrevs."
|
|
;; (interactive)
|
|
;; (&info "emacs" "dabbrevs") ; Select the specific info node.
|
|
;; )
|
|
(defvar dabbrevs-limit nil
|
|
"*Limits region searched by `dabbrevs-expand' to this many chars away.")
|
|
(make-variable-buffer-local 'dabbrevs-limit)
|
|
|
|
(defvar dabbrevs-backward-only nil
|
|
"*If non-NIL, `dabbrevs-expand' only looks backwards.")
|
|
|
|
; State vars for dabbrevs-re-expand.
|
|
(defvar last-dabbrevs-table nil
|
|
"Table of expansions seen so far (local)")
|
|
(make-variable-buffer-local 'last-dabbrevs-table)
|
|
|
|
(defvar last-dabbrevs-abbreviation ""
|
|
"Last string we tried to expand (local).")
|
|
(make-variable-buffer-local 'last-dabbrevs-abbreviation)
|
|
|
|
(defvar last-dabbrevs-direction 0
|
|
"Direction of last dabbrevs search (local)")
|
|
(make-variable-buffer-local 'last-dabbrevs-direction)
|
|
|
|
(defvar last-dabbrevs-abbrev-location nil
|
|
"Location last abbreviation began (local).")
|
|
(make-variable-buffer-local 'last-dabbrevs-abbrev-location)
|
|
|
|
(defvar last-dabbrevs-expansion nil
|
|
"Last expansion of an abbreviation. (local)")
|
|
(make-variable-buffer-local 'last-dabbrevs-expansion)
|
|
|
|
(defvar last-dabbrevs-expansion-location nil
|
|
"Location the last expansion was found. (local)")
|
|
(make-variable-buffer-local 'last-dabbrevs-expansion-location)
|
|
|
|
;;;###autoload
|
|
(defun dabbrev-expand (arg)
|
|
"Expand previous word \"dynamically\".
|
|
Expands to the most recent, preceding word for which this is a prefix.
|
|
If no suitable preceding word is found, words following point are considered.
|
|
|
|
If `case-fold-search' and `case-replace' are non-nil (usually true)
|
|
then the substituted word may be case-adjusted to match the abbreviation
|
|
that you had typed. This takes place if the substituted word, as found,
|
|
is all lower case, or if it is at the beginning of a sentence and only
|
|
its first letter was upper case.
|
|
|
|
A positive prefix arg N says to take the Nth backward DISTINCT
|
|
possibility. A negative argument says search forward. The variable
|
|
`dabbrev-backward-only' may be used to limit the direction of search to
|
|
backward if set non-nil.
|
|
|
|
If the cursor has not moved from the end of the previous expansion and
|
|
no argument is given, replace the previously-made expansion
|
|
with the next possible expansion not yet tried."
|
|
(interactive "*P")
|
|
(let (abbrev expansion old which loc n pattern
|
|
(do-case (and case-fold-search case-replace)))
|
|
;; abbrev -- the abbrev to expand
|
|
;; expansion -- the expansion found (eventually) or nil until then
|
|
;; old -- the text currently in the buffer
|
|
;; (the abbrev, or the previously-made expansion)
|
|
;; loc -- place where expansion is found
|
|
;; (to start search there for next expansion if requested later)
|
|
;; do-case -- non-nil if should transform case when substituting.
|
|
(save-excursion
|
|
(if (and (null arg)
|
|
(eq last-command this-command)
|
|
last-dabbrevs-abbrev-location)
|
|
(progn
|
|
(setq abbrev last-dabbrevs-abbreviation)
|
|
(setq old last-dabbrevs-expansion)
|
|
(setq which last-dabbrevs-direction))
|
|
(setq which (if (null arg)
|
|
(if dabbrevs-backward-only 1 0)
|
|
(prefix-numeric-value arg)))
|
|
(setq loc (point))
|
|
(forward-word -1)
|
|
(setq last-dabbrevs-abbrev-location (point)) ; Original location.
|
|
(setq abbrev (buffer-substring (point) loc))
|
|
(setq old abbrev)
|
|
(setq last-dabbrevs-expansion-location nil)
|
|
(setq last-dabbrev-table nil)) ; Clear table of things seen.
|
|
|
|
(setq pattern (concat "\\b" (regexp-quote abbrev) "\\(\\sw\\|\\s_\\)+"))
|
|
;; Try looking backward unless inhibited.
|
|
(if (>= which 0)
|
|
(progn
|
|
(setq n (max 1 which))
|
|
(if last-dabbrevs-expansion-location
|
|
(goto-char last-dabbrevs-expansion-location))
|
|
(while (and (> n 0)
|
|
(setq expansion (dabbrevs-search pattern t do-case)))
|
|
(setq loc (point-marker))
|
|
(setq last-dabbrev-table (cons expansion last-dabbrev-table))
|
|
(setq n (1- n)))
|
|
(or expansion
|
|
(setq last-dabbrevs-expansion-location nil))
|
|
(setq last-dabbrevs-direction (min 1 which))))
|
|
|
|
(if (and (<= which 0) (not expansion)) ; Then look forward.
|
|
(progn
|
|
(setq n (max 1 (- which)))
|
|
(if last-dabbrevs-expansion-location
|
|
(goto-char last-dabbrevs-expansion-location))
|
|
(while (and (> n 0)
|
|
(setq expansion (dabbrevs-search pattern nil do-case)))
|
|
(setq loc (point-marker))
|
|
(setq last-dabbrev-table (cons expansion last-dabbrev-table))
|
|
(setq n (1- n)))
|
|
(setq last-dabbrevs-direction -1))))
|
|
|
|
(if (not expansion)
|
|
(let ((first (string= abbrev old)))
|
|
(setq last-dabbrevs-abbrev-location nil)
|
|
(if (not first)
|
|
(progn (undo-boundary)
|
|
(delete-backward-char (length old))
|
|
(insert abbrev)))
|
|
(error (if first
|
|
"No dynamic expansion for \"%s\" found."
|
|
"No further dynamic expansions for \"%s\" found.")
|
|
abbrev))
|
|
;; Success: stick it in and return.
|
|
(undo-boundary)
|
|
(search-backward old)
|
|
;; Make case of replacement conform to case of abbreviation
|
|
;; provided (1) that kind of thing is enabled in this buffer
|
|
;; and (2) the replacement itself is all lower case.
|
|
;; First put back the original abbreviation with its original
|
|
;; case pattern.
|
|
(save-excursion
|
|
(replace-match abbrev t 'literal))
|
|
(search-forward abbrev)
|
|
(let ((do-case (and do-case
|
|
(string= (substring expansion 1)
|
|
(downcase (substring expansion 1))))))
|
|
;; First put back the original abbreviation with its original
|
|
;; case pattern.
|
|
(save-excursion
|
|
(replace-match abbrev t 'literal))
|
|
(search-forward abbrev)
|
|
(replace-match (if do-case (downcase expansion) expansion)
|
|
(not do-case)
|
|
'literal))
|
|
;; Save state for re-expand.
|
|
(setq last-dabbrevs-abbreviation abbrev)
|
|
(setq last-dabbrevs-expansion expansion)
|
|
(setq last-dabbrevs-expansion-location loc))))
|
|
|
|
;;;###autoload
|
|
(define-key esc-map "/" 'dabbrev-expand)
|
|
|
|
|
|
;; Search function used by dabbrevs library.
|
|
;; First arg is string to find as prefix of word. Second arg is
|
|
;; t for reverse search, nil for forward. Variable dabbrevs-limit
|
|
;; controls the maximum search region size.
|
|
|
|
;; Table of expansions already seen is examined in buffer last-dabbrev-table,
|
|
;; so that only distinct possibilities are found by dabbrevs-re-expand.
|
|
;; Note that to prevent finding the abbrev itself it must have been
|
|
;; entered in the table.
|
|
|
|
;; IGNORE-CASE non-nil means treat case as insignificant while
|
|
;; looking for a match and when comparing with previous matches.
|
|
;; Also if that's non-nil and the match is found at the beginning of a sentence
|
|
;; and is in lower case except for the initial
|
|
;; then it is converted to all lower case for return.
|
|
|
|
;; Value is the expansion, or nil if not found. After a successful
|
|
;; search, point is left right after the expansion found.
|
|
|
|
(defun dabbrevs-search (pattern reverse ignore-case)
|
|
(let (missing result (case-fold-search ignore-case))
|
|
(save-restriction ; Uses restriction for limited searches.
|
|
(if dabbrevs-limit
|
|
(narrow-to-region last-dabbrevs-abbrev-location
|
|
(+ (point)
|
|
(* dabbrevs-limit (if reverse -1 1)))))
|
|
;; Keep looking for a distinct expansion.
|
|
(setq result nil)
|
|
(setq missing nil)
|
|
(while (and (not result) (not missing))
|
|
; Look for it, leave loop if search fails.
|
|
(setq missing
|
|
(not (if reverse
|
|
(re-search-backward pattern nil t)
|
|
(re-search-forward pattern nil t))))
|
|
|
|
(if (not missing)
|
|
(progn
|
|
(setq result (buffer-substring (match-beginning 0)
|
|
(match-end 0)))
|
|
(let* ((test last-dabbrev-table))
|
|
(while (and test
|
|
(not
|
|
(if ignore-case
|
|
(string= (downcase (car test))
|
|
(downcase result))
|
|
(string= (car test) result))))
|
|
(setq test (cdr test)))
|
|
(if test (setq result nil)))))) ; if already in table, ignore
|
|
(if result
|
|
(save-excursion
|
|
(let ((beg (match-beginning 0)))
|
|
(goto-char beg)
|
|
(and ignore-case
|
|
(string= (substring result 1)
|
|
(downcase (substring result 1)))
|
|
(if (string= paragraph-start
|
|
(concat "^$\\|" page-delimiter))
|
|
(and (re-search-backward sentence-end nil t)
|
|
(= (match-end 0) beg))
|
|
(forward-char 1)
|
|
(backward-sentence)
|
|
(= (point) beg))
|
|
(setq result (downcase result))))))
|
|
result)))
|
|
|
|
(provide 'dabbrev)
|
|
|
|
;;; dabbrev.el ends here
|