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;;; hbmap.el --- GNU Hyperbole button map maintenance for queries and lookups. -*- lexical-binding: t; -*-
;;
;; Author: Bob Weiner
;;
;; Orig-Date: 6-Oct-91 at 06:34:05
;; Last-Mod: 7-Oct-22 at 23:18:45 by Mats Lidell
;;
;; SPDX-License-Identifier: GPL-3.0-or-later
;;
;; Copyright (C) 1991-2021 Free Software Foundation, Inc.
;; See the "HY-COPY" file for license information.
;;
;; This file is part of GNU Hyperbole.
;;; Commentary:
;;; Code:
;;; ************************************************************************
;;; Public variables
;;; ************************************************************************
(defvar hbmap:filename "HYPB"
"*Filename used for quick access button files.")
;;; ************************************************************************
;;; Public functions
;;; ************************************************************************
(defun hbmap:dir-add (dir-name &optional no-save)
"Add DIR-NAME to map of all directories in which user has written buttons.
Returns t iff DIR-NAME is not already in map, nil if it is, and some
other value when cannot read or write map.
Optional NO-SAVE disables saving of the map after an add."
(hbmap:dir-operate (lambda (dir) (not (hbmap:dir-member dir)))
dir-name
`(progn (prin1 (list ,dir-name) (current-buffer))
(terpri (current-buffer)))
no-save))
(defun hbmap:dir-list ()
"Return list of all directories in which user has written buttons."
(save-excursion
(let ((buf (unless (and (file-exists-p hbmap:dir-filename)
(not (file-readable-p hbmap:dir-filename)))
(find-file-noselect hbmap:dir-filename)))
dirs)
(when buf
(set-buffer buf)
(goto-char (point-min))
(condition-case ()
(while (setq dirs (cons (car (read (current-buffer)))
dirs)))
(error t))
dirs))))
(defun hbmap:dir-remove (dir-name &optional no-save)
"Remove DIR-NAME from map of all dirs in which user has written buttons.
Returns t iff DIR-NAME is in the map and is successfully removed, nil if it
is not, and some other value when the map is not readable or writable.
Optional NO-SAVE disables saving of the map after a removal."
(hbmap:dir-operate 'hbmap:dir-member dir-name
'(delete-region (point) (progn (forward-line 1) (point)))
no-save))
(defun hbmap:dir-member (dir-name)
"Return t iff DIR-NAME is a member of user's Hyperbole map, else nil.
If t, point is left at the start of the matching map entry. If nil,
point is left in a position appropriate for insertion of a new entry."
(let ((obuf (current-buffer))
(buf (and (file-exists-p hbmap:dir-filename)
(find-file-noselect hbmap:dir-filename)))
rtn)
(if buf
(progn (set-buffer buf) (widen) (goto-char 1)
(if (search-forward (concat "\n(\"" dir-name "\"") nil t)
(progn (beginning-of-line) (setq rtn t))
(goto-char 1)
(or (= (forward-line 1) 0) (insert "\n")))
(set-buffer obuf)))
rtn))
;;; ************************************************************************
;;; Private functions
;;; ************************************************************************
(defun hbmap:dir-operate (pred dir-name form &optional no-save)
"If PRED called on DIR-NAME is non-nil, evaluate FORM.
Return t if PRED evaluation is successful and nil when not, except when
hbmap is not readable or writable, in which case return a symbol indicating
the error. Optional NO-SAVE disables saving of the map after operation."
(save-excursion
(let ((buf (unless (and (file-exists-p hbmap:dir-filename)
(not (file-readable-p hbmap:dir-filename)))
(find-file-noselect hbmap:dir-filename))))
(if buf
(progn (set-buffer buf)
(when (funcall pred dir-name)
(setq buffer-read-only nil)
(eval form)
(cond (no-save
t)
((file-writable-p buffer-file-name)
(save-buffer)
t)
(t 'hbmap-not-writable))))
'hbmap-not-readable))))
;;; ************************************************************************
;;; Private variables
;;; ************************************************************************
(defvar hbmap:dir-user
(if (and hyperb:microsoft-os-p
(not (getenv "HOME")))
"c:/_hyperb/" "~/.hyperb/")
"Per user directory in which to store top level Hyperbole map data.
Must end with a directory separator.
Hyperbole will try to create it whenever `hyperb:init' is called.")
(defvar hbmap:dir-filename
(expand-file-name "HBMAP" hbmap:dir-user)
"Name of a file that lists all dirs to which a user has written buttons.
See also `hbmap:dir-user'.
If you change its value, you will be unable to search for buttons created by
others who use a different value!")
(provide 'hbmap)
;;; hbmap.el ends here
|
