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- ;;!emacs
- ;;
- ;; FILE: hbut.el
- ;; SUMMARY: Hyperbole button constructs.
- ;; USAGE: GNU Emacs Lisp Library
- ;; KEYWORDS: extensions, hypermedia
- ;;
- ;; AUTHOR: Bob Weiner
- ;; ORG: Brown U.
- ;;
- ;; ORIG-DATE: 18-Sep-91 at 02:57:09
- ;; LAST-MOD: 14-Apr-95 at 16:01:20 by Bob Weiner
- ;;
- ;; This file is part of Hyperbole.
- ;; Available for use and distribution under the same terms as GNU Emacs.
- ;;
- ;; Copyright (C) 1991-1995, Free Software Foundation, Inc.
- ;; Developed with support from Motorola Inc.
- ;;
- ;; DESCRIPTION:
- ;; DESCRIP-END.
-
- ;;; ************************************************************************
- ;;; Other required Elisp libraries
- ;;; ************************************************************************
-
- (require 'hmoccur)
- (require 'hbmap)
- (require 'htz)
- (require 'hbdata)
- (require 'hact)
-
- ;;; ************************************************************************
- ;;; Public definitions
- ;;; ************************************************************************
-
- ;;; ========================================================================
- ;;; ebut class - Explicit Hyperbole buttons
- ;;; ========================================================================
-
- (defvar ebut:hattr-save t
- "*Non-nil value saves button data when button source is saved.
- Nil disables saving.")
-
- (defconst ebut:max-len 100
- "Maximum length of a hyper-button label.")
-
-
- (defun ebut:alist (&optional file)
- "Returns alist with each element a list containing a button label.
- For use as a completion table. Gets labels from optional FILE or current
- buffer."
- (mapcar 'list (ebut:list file)))
-
- (defun ebut:at-p (&optional start-delim end-delim)
- "Returns explicit Hyperbole button at point or nil.
- Assumes point is within first line of button label, if at all.
- Optional START-DELIM and END-DELIM are strings that override default
- button delimiters."
- (let ((key (ebut:label-p nil start-delim end-delim)))
- (and key (ebut:get key))))
-
- (defun ebut:create (&optional but-sym)
- "Creates Hyperbole explicit button based on optional BUT-SYM.
- Default is 'hbut:current'.
- Button should hold the following attributes (see 'hattr:set'):
- lbl-key (normalized button label string),
- loc (filename or buffer where button is located),
- dir (directory name where button is located),
- actype (action type that provides a default action for the button),
- action (optional action that overrides the default),
- args (list of arguments for action, if action takes a single
- argument of the button lbl-key, args may be nil).
-
- If successful returns any instance number to append to button label
- except when instance number would be 1, then returns t. On failure,
- returns nil.
-
- If successful, leaves point in button data buffer, so caller should use
- 'save-excursion'. Does not save button data buffer."
- (let ((lbl-instance (hbdata:write nil but-sym)))
- (run-hooks 'ebut:create-hook)
- lbl-instance))
-
- (defun ebut:delete (&optional but-sym)
- "Deletes Hyperbole explicit button based on optional BUT-SYM.
- Default is 'hbut:current'.
- Returns entry deleted (a list of attribute values) or nil."
- (if (null but-sym) (setq but-sym 'hbut:current))
- (if (ebut:is-p but-sym)
- (let* ((but-key (hattr:get but-sym 'lbl-key))
- (loc (hattr:get but-sym 'loc))
- (entry (hbdata:delete-entry but-key loc)))
- (run-hooks 'ebut:delete-hook)
- entry)))
-
- (defun ebut:get (&optional lbl-key buffer key-src)
- "Returns explicit Hyperbole button symbol given by LBL-KEY and BUFFER.
- KEY-SRC is given when retrieving global buttons and is full source pathname.
- Retrieves button data, converts into a button object and returns a symbol
- which references the button.
-
- All arguments are optional. When none are given, returns symbol for
- button that point is within or nil. BUFFER defaults to the current
- buffer."
- (hattr:clear 'hbut:current)
- (save-excursion
- (let ((key-file) (key-dir) (but-data) (actype))
- (or lbl-key (setq lbl-key (ebut:label-p)))
- (if buffer
- (if (bufferp buffer) (set-buffer buffer)
- (error "(ebut:get): Invalid buffer argument: %s" buffer)))
- (if key-src
- nil
- (if (equal lbl-key (ebut:label-p))
- nil
- (goto-char (point-min))
- (ebut:next-occurrence lbl-key))
- (if (setq key-src (ebut:key-src 'full))
- ;; 'ebut:key-src' sets current buffer to key-src buffer.
- (setq buffer (current-buffer)))
- )
- (if (and (stringp lbl-key) key-src)
- (progn
- (if (stringp key-src)
- (setq key-dir (file-name-directory key-src)
- key-file (file-name-nondirectory key-src)))
- (setq but-data (and key-src
- (hbdata:get-entry lbl-key (or key-file key-src)
- key-dir)))
- (if (null but-data)
- nil
- (hattr:set 'hbut:current 'lbl-key lbl-key)
- (hattr:set 'hbut:current 'loc key-src)
- (hattr:set 'hbut:current 'categ 'explicit)
- (hattr:set 'hbut:current 'action nil)
- (hattr:set 'hbut:current 'actype
- (intern (setq actype (hbdata:actype but-data))))
- ;; Hyperbole V1 referent compatibility
- (if (= (length actype) 2)
- (hattr:set 'hbut:current 'referent
- (hbdata:referent but-data)))
- (hattr:set 'hbut:current 'args (hbdata:args but-data))
- (hattr:set 'hbut:current 'creator (hbdata:creator but-data))
- (hattr:set 'hbut:current
- 'create-time (hbdata:create-time but-data))
- (hattr:set 'hbut:current
- 'modifier (hbdata:modifier but-data))
- (hattr:set 'hbut:current
- 'mod-time (hbdata:mod-time but-data))
- 'hbut:current)
- )))))
-
- (defun ebut:is-p (object)
- "Returns non-nil if OBJECT denotes an explicit Hyperbole button."
- (and (symbolp object)
- (eq (hattr:get object 'categ) 'explicit)))
-
- (defun ebut:key-of-label-p (key label)
- "Returns t iff KEY matches to LABEL in a case insensitive manner."
- (and (stringp key) (stringp label)
- (equal key (downcase (ebut:label-to-key label)))))
-
- (defun ebut:key-src (&optional full)
- "Return key source (usually unqualified) for current Hyperbole button.
- Also sets current buffer to key source.
- With optional FULL when source is a pathname, the full pathname is returned."
- (let ((src (cond ((hmail:mode-is-p) (current-buffer))
- ((ebut:key-src-fmt))
- ((save-excursion
- (save-restriction
- (widen)
- (if (and (search-backward hbut:source-prefix nil t)
- (or (= (preceding-char) ?\n) (= (point)
- (point-min))))
- (hbut:source full)))))
- (buffer-file-name
- (if full buffer-file-name
- (file-name-nondirectory buffer-file-name)))
- (t (current-buffer))
- )))
- (cond ((null src) nil)
- ((bufferp src)
- (set-buffer src)
- src)
- ((file-readable-p src)
- (set-buffer (find-file-noselect src))
- src)
- ((file-readable-p (setq src (hpath:symlink-referent src)))
- (set-buffer (find-file-noselect src))
- src))))
-
- (defun ebut:key-src-fmt ()
- "Returns unformatted filename associated with formatted current buffer.
- This is used to obtain the source of explicit buttons for buffers that
- represent the output of particular document formatters."
- (cond ((or (eq major-mode 'Info-mode)
- (string-match "\\.info\\(-[0-9]+\\)?$" (buffer-name)))
- (let ((src (and buffer-file-name
- (substring
- buffer-file-name
- 0 (string-match "\\.[^.]+$" buffer-file-name)))))
- (cond ((file-exists-p (concat src ".texi"))
- (concat src ".texi"))
- ((file-exists-p (concat src ".texinfo"))
- (concat src ".texinfo"))
- ((current-buffer)))))
- ))
-
- (defun ebut:key-to-label (lbl-key)
- "Unnormalizes LBL-KEY and returns a label string approximating actual label."
- (if lbl-key
- (let* ((pos 0) (len (length lbl-key)) (lbl) c)
- (while (< pos len)
- (setq c (aref lbl-key pos)
- lbl (concat lbl
- (if (= c ?_)
- (if (or (= (1+ pos) len)
- (/= (aref lbl-key (1+ pos)) ?_))
- " "
- (setq pos (1+ pos))
- "_")
- (char-to-string c)))
- pos (1+ pos)))
- lbl)))
-
- (defun ebut:label-p (&optional as-label start-delim end-delim pos-flag)
- "Returns key for Hyperbole button label that point is within.
- Returns nil if not within a label.
- Assumes point is within first line of button label, if at all.
- If optional AS-LABEL is non-nil, label is returned rather than the key
- derived from the label. Optional START-DELIM and END-DELIM are strings
- that override default button delimiters. With optional POS-FLAG non-nil,
- returns list of label-or-key, but-start-position, but-end-position.
- Positions include delimiters."
- (let ((opoint (point))
- (npoint (1+ (point)))
- (quoted "\\(^\\|[^\\{]\\)")
- (start)
- lbl-key end but-start but-end)
- (or start-delim (setq start-delim ebut:start))
- (or end-delim (setq end-delim ebut:end))
- (save-excursion
- (beginning-of-line)
- (while (and (progn
- (while (re-search-forward
- (concat quoted (regexp-quote start-delim))
- npoint t)
- (setq start t))
- start)
- (re-search-forward (concat "[^\\{]" (regexp-quote end-delim))
- npoint t))
- (setq start nil))
- (if start
- (progn
- (setq start (point)
- but-start (match-end 1))
- (if (= ?\( (char-syntax (preceding-char)))
- (condition-case ()
- (progn
- (forward-char -1)
- (forward-list)
- (forward-char -2))
- (error (goto-char (1- opoint))))
- (goto-char (1- opoint)))
- (and (< (point) (+ start ebut:max-len))
- (re-search-forward (concat quoted (regexp-quote end-delim))
- (+ start ebut:max-len) t)
- (setq but-end (point)
- end (- (point) (length end-delim))
- lbl-key (ebut:label-to-key (buffer-substring start end)))
- (cond (pos-flag
- (if as-label
- (list (ebut:key-to-label lbl-key) but-start but-end)
- (list lbl-key but-start but-end)))
- (t (if as-label (ebut:key-to-label lbl-key) lbl-key)))))))))
-
- (defun ebut:label-regexp (lbl-key &optional no-delim)
- "Unnormalizes LBL-KEY. Returns regular expr matching delimited but label.
- Optional NO-DELIM leaves off delimiters and leading and trailing space."
- (if lbl-key
- (let* ((pos 0)
- (len (length lbl-key))
- (c)
- (sep0 "[ \t\n\^M]*")
- (sep "[ \t\n\^M]+")
- (regexp (if no-delim "" (concat (regexp-quote ebut:start) sep0)))
- (case-fold-search))
- (while (< pos len)
- (setq c (aref lbl-key pos)
- regexp (concat regexp
- (if (= c ?_)
- (if (or (= (1+ pos) len)
- (/= (aref lbl-key (1+ pos)) ?_))
- sep
- (setq pos (1+ pos))
- "_")
- (regexp-quote (char-to-string c))))
- pos (1+ pos)))
- (if no-delim regexp
- (setq regexp (concat regexp sep0 (regexp-quote ebut:end)))))))
-
- (defun ebut:label-to-key (label)
- "Normalizes LABEL for use as a Hyperbole button key and returns key.
- Eliminates any fill prefix in the middle of the label, replaces '_' with
- '__', removes leading and trailing whitespace and replaces each other
- whitespace sequence with '_'."
- (if (null label)
- nil
- (setq label (hbut:fill-prefix-remove label)
- ;; Remove leading and trailing space.
- label (hypb:replace-match-string "\\`[ \t\n\^M]+\\|[ \t\n\^M]+\\'"
- label "")
- label (hypb:replace-match-string "_" label "__" t))
- (hypb:replace-match-string "[ \t\n\^M]+" label "_" t)))
-
- (defun ebut:list (&optional file loc-p)
- "Returns list of button labels from given FILE or current buffer.
- Removes duplicate labels if optional LOC-P is omitted. With LOC-P, returns
- list of elements (label start end) where start and end are the buffer
- positions at which the starting button delimiter begins and ends."
- (interactive)
- (setq file (if file (and (file-exists-p file) (find-file-noselect file))
- (current-buffer)))
- (if file
- (progn
- (set-buffer file)
- (let ((buts (ebut:map (if loc-p
- (function
- (lambda (lbl start end)
- ;; Normalize label spacing
- (list (ebut:key-to-label
- (ebut:label-to-key lbl))
- start end)))
- (function
- (lambda (lbl start end)
- ;; Normalize label spacing
- (ebut:key-to-label
- (ebut:label-to-key lbl))))))))
- (if loc-p buts (nreverse (set:create buts)))))))
-
- (fset 'map-ebut 'ebut:map)
- (defun ebut:map (but-func &optional start-delim end-delim
- regexp-match include-delims)
- "Applies BUT-FUNC to buttons delimited by optional START-DELIM and END-DELIM.
- If REGEXP-MATCH is non-nil, only buttons which match this argument are
- considered.
- Maps over portion of buffer visible under any current restriction.
- BUT-FUNC must take precisely three arguments: the button label, the
- start position of the delimited button label and its end position (positions
- include delimiters when INCLUDE-DELIMS is non-nil).
- If END-DELIM is a symbol, e.g. t, then START-DELIM is taken as a regular
- expression which matches an entire button string."
- (or start-delim (setq start-delim ebut:start))
- (or end-delim (setq end-delim ebut:end))
- (let* ((regexp (symbolp end-delim))
- (end-sym (or regexp (substring end-delim -1)))
- (rtn)
- (quoted)
- start end but lbl)
- (save-excursion
- (goto-char (point-min))
- (setq include-delims (if include-delims 0 1))
- (while (re-search-forward
- (if regexp start-delim
- (concat (regexp-quote start-delim)
- "\\([^" end-sym "\"][^" end-sym "]*\\)"
- (regexp-quote end-delim)))
- nil t)
- (setq start (match-beginning include-delims)
- end (match-end include-delims)
- but (buffer-substring (match-beginning 0) (match-end 0))
- lbl (buffer-substring (match-beginning 1) (match-end 1)))
- (save-excursion
- (goto-char start)
- (if (or (= (preceding-char) ?\\) (= (preceding-char) ?\{))
- ;; Ignore matches with quoted delimiters.
- (setq quoted t)))
- (cond (quoted (setq quoted nil))
- ((or (not regexp-match)
- (string-match regexp-match but))
- (setq rtn (cons (funcall but-func lbl start end) rtn))))))
- (nreverse rtn)))
-
- (defun ebut:modify (&optional lbl-key but-sym)
- "Modifies existing Hyperbole button from optional LBL-KEY and BUT-SYM.
- Defaults are the key for any button label at point and 'hbut:current'.
- If successful, returns button's instance number except when instance
- number is 1, then returns t. On failure, as when button does not exist,
- returns nil.
-
- If successful, leaves point in button data buffer, so caller should use
- 'save-excursion'. Does not save button data buffer."
- (save-excursion
- (let ((lbl-instance (hbdata:write lbl-key but-sym)))
- (run-hooks 'ebut:modify-hook)
- lbl-instance)))
-
- (defun ebut:next-occurrence (lbl-key &optional buffer)
- "Moves point to next occurrence of button with LBL-KEY in optional BUFFER.
- BUFFER defaults to current buffer. It may be a buffer name.
- Returns non-nil iff occurrence is found.
-
- Remember to use (goto-char (point-min)) before calling this in order to
- move to the first occurrence of the button."
- (if buffer
- (if (not (or (bufferp buffer)
- (and (stringp buffer) (get-buffer buffer))))
- (error "(ebut:next-occurrence): Invalid buffer arg: %s" buffer)
- (switch-to-buffer buffer)))
- (if (re-search-forward (ebut:label-regexp lbl-key) nil t)
- (goto-char (+ (match-beginning 0) (length ebut:start)))))
-
- (defun ebut:operate (curr-label new-label)
- "Operates on a new or existing Hyperbole button given by CURR-LABEL.
- When NEW-LABEL is non-nil, this is substituted for CURR-LABEL and the
- associated button is modified. Otherwise, a new button is created.
- Returns instance string appended to label to form unique label, nil if
- label is already unique. Signals an error when no such button is found
- in the current buffer."
- (let* ((lbl-key (ebut:label-to-key curr-label))
- (lbl-regexp (ebut:label-regexp lbl-key))
- (modify new-label)
- (instance-flag))
- (or new-label (setq new-label curr-label))
- (hattr:set 'hbut:current 'lbl-key (ebut:label-to-key new-label))
- (save-excursion
- (if (setq instance-flag
- (if modify (ebut:modify lbl-key) (ebut:create)))
- (if (hmail:editor-p) (hmail:msg-narrow))))
- (if instance-flag
- (progn
- ;; Rename all occurrences of button - those with same label.
- (if modify
- (let* ((but-key-and-pos (ebut:label-p nil nil nil 'pos))
- (at-but (equal (car but-key-and-pos)
- (ebut:label-to-key new-label))))
- (if at-but
- (ebut:delimit (nth 1 but-key-and-pos)
- (nth 2 but-key-and-pos)
- instance-flag))
- (cond ((ebut:map
- (function
- (lambda (lbl start end)
- (delete-region start end)
- (ebut:delimit
- (point)
- (progn (insert new-label) (point))
- instance-flag)))
- nil nil lbl-regexp 'include-delims))
- (at-but)
- ((hypb:error "(ebut:operate): No button matching: %s" curr-label))))
- ;; Add a new button.
- (let (start end buf-lbl)
- (cond ((and (marker-position (hypb:mark-marker t))
- (setq start (region-beginning)
- end (region-end)
- buf-lbl (buffer-substring start end))
- (equal buf-lbl curr-label))
- nil)
- ((looking-at (regexp-quote curr-label))
- (setq start (point)
- end (match-end 0)))
- (t (setq start (point))
- (insert curr-label)
- (setq end (point))))
- (ebut:delimit start end instance-flag))
- )
- ;; Position point
- (let ((new-key (ebut:label-to-key new-label)))
- (cond ((equal (ebut:label-p) new-key)
- (forward-char 1) (search-backward ebut:start nil t)
- (goto-char (match-end 0)))
- ((let ((regexp (ebut:label-regexp new-key)))
- (or (re-search-forward regexp nil t)
- (re-search-backward regexp nil t)))
- (goto-char (+ (match-beginning 0) (length ebut:start))))))
- ;; instance-flag might be 't which we don't want to return.
- (if (stringp instance-flag) instance-flag))
- (hypb:error
- "(ebut:operate): Operation failed. Check button attribute permissions: %s"
- hattr:filename))))
-
- (defun ebut:search (string out-buf &optional match-part)
- "Writes explicit button lines matching STRING to OUT-BUF.
- Uses Hyperbole space into which user has written buttons for the search.
- By default, only matches for whole button labels are found, optional MATCH-PART
- enables partial matches."
- (let* ((buffers (mapcar (function
- (lambda (dir)
- (expand-file-name hattr:filename dir)))
- (hbmap:dir-list)))
- (total 0)
- (firstmatch))
- (save-excursion
- (set-buffer out-buf)
- (setq buffer-read-only nil)
- (widen)
- (erase-buffer)
- (let (currbuf currfile kill-buf src-matches dir)
- (while buffers
- (setq currbuf (car buffers)
- currfile (if (stringp currbuf) currbuf)
- kill-buf (and currfile (not (get-file-buffer currfile)))
- buffers (cdr buffers))
- (if currfile
- (setq currbuf (and (file-readable-p currfile)
- (find-file-noselect currfile))
- dir (file-name-directory currfile))
- (setq currfile (buffer-file-name currbuf)))
- (and currfile currbuf
- (unwind-protect
- (setq src-matches
- (hbdata:search currbuf string match-part))
- (if kill-buf (kill-buffer currbuf))))
- (if src-matches
- (let (elt matches)
- (while src-matches
- (setq elt (car src-matches))
- (if (null elt) nil
- (setq src-matches (cdr src-matches)
- currfile (expand-file-name (car elt) dir)
- matches (cdr elt)
- currbuf (get-file-buffer currfile)
- kill-buf (not currbuf)
- currbuf (or currbuf
- (and (file-readable-p currfile)
- (find-file-noselect currfile))))
- (if (null currbuf)
- (progn (set-buffer out-buf)
- (insert "ERROR: (ebut:search): \"" currfile
- "\" is not readable.\n\n"))
- (set-buffer currbuf)
- (unwind-protect
- (save-excursion
- (widen) (goto-char 1)
- (let ((case-fold-search t)
- (regexp
- (ebut:match-regexp matches match-part)))
- (setq firstmatch t)
- (while (re-search-forward regexp nil t)
- (setq total (1+ total))
- (let* ((linenum (count-lines (point-min)
- (point)))
- (tag (format "\n%4d:" linenum))
- lns start end)
- (setq end (progn (end-of-line) (point))
- start (progn
- (goto-char (match-beginning 0))
- (beginning-of-line) (point))
- lns (buffer-substring start end))
- (goto-char end)
- (save-excursion
- (set-buffer out-buf)
- (if firstmatch
- (progn
- (insert hbut:source-prefix "\""
- currfile "\"\n")
- (setq firstmatch nil)))
- (insert tag lns))))
- (set-buffer out-buf)
- (if (not firstmatch) (insert "\n\n"))))
- (if kill-buf (kill-buffer currbuf)))))))))))
- total))
-
- ;;; ------------------------------------------------------------------------
- (defun ebut:delimit (start end instance-str)
- "Delimits button label spanning region START to END in current buffer.
- If button is already delimited or delimit fails, returns nil, else t.
- Inserts INSTANCE-STR after END, before ending delimiter."
- (goto-char start)
- (if (looking-at (regexp-quote ebut:start))
- (forward-char (length ebut:start)))
- (if (ebut:label-p)
- nil
- (if (not (stringp instance-str)) (setq instance-str ""))
- (insert ebut:start)
- (goto-char (setq end (+ end (length ebut:start))))
- (insert instance-str ebut:end)
- (setq end (+ end (length instance-str) (length ebut:end)))
- (and (fboundp 'hproperty:but-add) (hproperty:but-add start end hproperty:but))
- (hbut:comment start end)
- (goto-char end)
- t))
-
- (defun ebut:match-regexp (match-keys match-part)
- "Returns regexp to match to all explicit button keys from MATCH-KEYS."
- (setq match-part (if match-part
- (concat "[^" (substring ebut:end -1) "]*")
- "[ \t\n]*"))
- (concat
- (regexp-quote ebut:start) match-part
- "\\(" (mapconcat (function
- (lambda (key) (ebut:label-regexp key 'no-delim)))
- match-keys "\\|")
- "\\)" match-part (regexp-quote ebut:end)))
-
- (defconst ebut:start "<("
- "String matching the start of a hyper-button.")
- (defconst ebut:end ")>"
- "String matching the end of a hyper-button.")
- (defconst ebut:instance-sep ":"
- "String of one character, separates an ebut label from its instance num.")
-
- ;;; ========================================================================
- ;;; gbut class - Global Hyperbole buttons - activated by typing label name
- ;;; ========================================================================
-
- (defvar gbut:file (expand-file-name hbmap:filename hbmap:dir-user)
- "File that stores Hyperbole buttons accessible by name, global buttons.")
-
- (defun gbut:act (label)
- "Activates Hyperbole global button with LABEL."
- (interactive (list (hargs:read-match "Activate global button labeled: "
- (mapcar 'list (gbut:lbl-list))
- nil t nil 'ebut)))
- (let* ((lbl-key (hbut:label-to-key label))
- (but (ebut:get lbl-key nil gbut:file)))
- (if but
- (hbut:act but)
- (error "(gbut:act): No global button labeled: %s" label))))
-
- (defun gbut:help (label)
- "Displays help for Hyperbole global button with LABEL."
- (interactive (list (hargs:read-match "Report on global button labeled: "
- (mapcar 'list (gbut:lbl-list))
- nil t nil 'ebut)))
- (let* ((lbl-key (hbut:label-to-key label))
- (but (ebut:get lbl-key nil gbut:file)))
- (if but
- (hbut:report but)
- (error "(gbut:help): No global button labeled: %s" label))))
-
- ;;; ------------------------------------------------------------------------
- (defun gbut:key-list ()
- "Returns list of global button label keys."
- (save-excursion
- (if (hbdata:to-entry-buf gbut:file)
- (let ((gbuts))
- (save-restriction
- (narrow-to-region (point) (if (search-forward "\^L" nil t)
- (point) (point-max)))
- (goto-char (point-min))
- (condition-case ()
- (while (setq gbuts (cons (car (read (current-buffer))) gbuts)))
- (error nil))
- gbuts)))))
-
- (defun gbut:lbl-list ()
- "Returns list of global button labels."
- (mapcar 'hbut:key-to-label (gbut:key-list)))
-
- ;;; ========================================================================
- ;;; hattr class
- ;;; ========================================================================
-
- (defun hattr:attributes (obj-symbol)
- "Returns a list of OBJ-SYMBOL's attributes as symbols."
- (if (symbolp obj-symbol)
- (let* ((attr-val-list (symbol-plist obj-symbol))
- (i -1))
- (delq nil (mapcar (function
- (lambda (elt)
- (setq i (1+ i))
- (and (= (% i 2) 0) elt)))
- attr-val-list)))))
-
- (defun hattr:clear (hbut)
- "Removes all of HBUT's attributes except `variable-documentation'."
- (let (sublist)
- (or (symbolp hbut)
- (error "(hattr:clear): Argument not a Hyperbole button: %s" hbut))
- (if (setq sublist (memq 'variable-documentation (symbol-plist hbut)))
- (progn
- (setcdr (cdr sublist) nil)
- (setplist hbut sublist))
- (setplist hbut nil)
- )))
-
- (defun hattr:copy (from-hbut to-hbut)
- "Copies attributes FROM-HBUT TO-HBUT, eliminating attributes TO-HBUT had.
- Returns TO-HBUT."
- (mapcar
- (function
- (lambda (hbut)
- (or (and hbut (symbolp hbut))
- (error "(hattr:clear): Argument not a Hyperbole button: %s" hbut))))
- (list from-hbut to-hbut))
- (unwind-protect
- nil
- (hattr:clear to-hbut)
- (setplist to-hbut (copy-sequence (symbol-plist from-hbut))))
- to-hbut)
-
- (defun hattr:get (obj-symbol attr-symbol)
- "Returns value of OBJ-SYMBOL's attribute ATTR-SYMBOL."
- (get obj-symbol attr-symbol))
-
- (defun hattr:list (obj-symbol)
- "Returns a property list of OBJ-SYMBOL's attributes.
- Each pair of elements is: <attrib-name> <attrib-value>."
- (if (symbolp obj-symbol)
- (symbol-plist obj-symbol)
- (error "(hattr:list): Argument not a symbol: %s" obj-symbol)))
-
- (defun hattr:memq (attr-symbol obj-symbol)
- "Returns t if ATTR-SYMBOL is in OBJ-SYMBOL's attribute list, else nil."
- (and (symbolp obj-symbol) (symbolp attr-symbol)
- (let* ((attr-val-list (symbol-plist obj-symbol))
- (attr-list (let ((i -1))
- (delq nil (mapcar
- (function
- (lambda (elt)
- (setq i (1+ i))
- (and (= (% i 2) 0) elt)))
- attr-val-list)))))
- (if (memq attr-symbol attr-list) t))))
-
- (defun hattr:report (attrib-list)
- "Pretty prints to standard-output attribute-value pairs from ATTRIB-LIST.
- Ignores nil valued attributes. Returns t unless no attributes are printed."
- (let ((has-attr) attr val len)
- (if (or (null attrib-list) (not (listp attrib-list))
- ;; odd number of elements?
- (= (% (length attrib-list) 2) 1))
- nil
- (while (setq attr (car attrib-list))
- (setq val (car (setq attrib-list (cdr attrib-list)))
- attrib-list (cdr attrib-list))
- (if val
- (progn
- (setq has-attr t
- attr (symbol-name attr)
- len (max (- 16 (length attr)) 1))
- (princ " ") (princ attr) (princ ":")
- (princ (make-string len ? ))
- (let (str)
- (prin1 (cond ((string-match "time" attr)
- (htz:date-unix val
- (and (>= (aref val 0) ?0)
- (<= (aref val 0) ?9)
- "GMT") htz:local))
- ((and (setq str (if (stringp val) val
- (prin1-to-string val)))
- (string-match "\\`actypes::" str))
- (intern (substring str (match-end 0))))
- (t val))))
- (terpri))))
- has-attr)))
-
- (defun hattr:save ()
- "Saves button attribute file for current directory, if modified.
- Suitable for use as part of 'write-file-hooks'."
- (let* ((bd-file (expand-file-name hattr:filename default-directory))
- (buf (and (stringp default-directory)
- (get-file-buffer bd-file))))
- (if (and ebut:hattr-save buf (not (eq buf (current-buffer))))
- (let ((ebut:hattr-save));; Prevents 'write-file-hooks' looping.
- (and (buffer-modified-p buf)
- (save-excursion
- (set-buffer buf) (save-buffer)
- ;; Unlock button attribute file; kill buffer so user is
- ;; never holding a buffer which is out of sync with file,
- ;; due to some other user's edits.
- ;; Maybe this should be user or site configurable.
- (or (buffer-modified-p buf) (kill-buffer buf))
- )))))
- ;; Must return nil, so can be used as part of write-file-hooks.
- nil)
-
- (defun hattr:set (obj-symbol attr-symbol attr-value)
- "Sets OBJ-SYMBOL's attribute ATTR-SYMBOL to ATTR-VALUE."
- (put obj-symbol attr-symbol attr-value))
-
- (fset 'hattr:summarize 'hattr:report)
-
- (defvar hattr:filename ".hypb"
- "Per directory file name in which explicit button attributes are stored.
- If you change its value, you will be unable to use buttons created by
- others who use a different value!")
-
- ;;; ========================================================================
- ;;; hbut class - abstract
- ;;; ========================================================================
-
- (defun hbut:act (hbut)
- "Performs action for explicit or implicit Hyperbole button symbol HBUT."
- (and hbut (apply 'actype:act (hattr:get hbut 'actype)
- (hattr:get hbut 'args))))
-
- (defun hbut:action (hbut)
- "Returns appropriate action for Hyperbole button symbol HBUT."
- (let ((categ (hattr:get hbut 'categ)) (atype) (action))
- (if (eq categ 'explicit)
- (progn (setq action (hattr:get hbut 'action)
- atype (hattr:get hbut 'actype))
- (if (= (length (symbol-name atype)) 2)
- atype
- (or action (actype:action atype))))
- ;; Must be an implicit button.
- (if (fboundp atype) atype))))
-
- (defun hbut:at-p ()
- "Returns symbol for explicit or implicit Hyperbole button at point or nil."
- (or (ebut:at-p) (ibut:at-p)))
-
-
- (defun hbut:comment (start end)
- "Comment button label spanning region START to END in current buffer.
- Use buffer commenting grammar, if any, otherwise don't comment."
- (save-excursion
- (if comment-start
- (if (or (equal comment-end "")
- (null comment-end))
- (progn
- (beginning-of-line)
- (if (search-forward comment-start start t)
- nil
- (goto-char start)
- (insert comment-start)
- (if (/= (preceding-char) ? )
- (insert ? ))))
- ;; Comments have both start and end delimiters
- (if (and (re-search-backward
- (concat (regexp-quote comment-start) "\\|"
- (regexp-quote comment-end))
- nil t)
- (looking-at (regexp-quote comment-start)))
- nil
- (goto-char start)
- (insert comment-start)
- (if (/= (preceding-char) ? )
- (insert ? ))
- (goto-char (+ (point) (- end start)))
- (if (/= (following-char) ? )
- (insert ? ))
- (insert comment-end)
- )))))
-
- ;;; Regexps derived in part from "filladapt.el" under the GPL, Copyright
- ;;; 1989 Kyle E. Jones.
- (defvar hbut:fill-prefix-regexps
- '(
- ;; Included text in news or mail messages
- "\n[ \t]*\\([:|<>]+ *\\)+"
- ;; Included text generated by SUPERCITE. We can't hope to match all
- ;; the possible variations.
- "\n[ \t]*[^'`\"< \t]*> *"
- ;; Lisp comments
- "\n[ \t]*\\(;+[ \t]*\\)+"
- ;; UNIX shell comments
- "\n[ \t]*\\(#+[ \t]*\\)+"
- ;; C++ comments
- "\n[ \t]*//[/ \t]+"
- ;; C or Pascal comments, one open and close per line, so match close
- ;; then open.
- "\\*+[/\)][ \t]*\n+[ \t]*[/\(]\\*+"
- "}[ \t]*\n+[ \t]*{"
- ;; Eiffel or Sather comments
- "\n[ \t]*--[ \t]+"
- ;; Fortran comments
- "\n[Cc][ \t]+"
- ;; Postscript comments
- "\n[ \t]*\\(%+[ \t]*\\)+"
- )
- "List of regexps of fill prefixes to remove from the middle of buttons.")
-
- (defun hbut:fill-prefix-remove (label)
- "Removes any recognized fill prefix from within LABEL.
- 'hbut:fill-prefix-regexps' is a list of fill prefixes to recognize."
- (if (string-match "\n" label)
- (mapcar
- (function
- (lambda (fill-prefix)
- (and (string-match "\n" label)
- (setq label
- (hypb:replace-match-string fill-prefix label " " t)))))
- hbut:fill-prefix-regexps))
- label)
-
- (defun hbut:is-p (object)
- "Returns non-nil if object denotes a Hyperbole button."
- (and (symbolp object) (hattr:get object 'categ)))
-
- (fset 'hbut:key-src 'ebut:key-src)
- (fset 'hbut:key-to-label 'ebut:key-to-label)
-
- (defun hbut:label (hbut)
- "Returns the label for Hyperbole button symbol HBUT."
- (if (hbut:is-p hbut)
- (hbut:key-to-label (hattr:get hbut 'lbl-key))
- (error "(hbut:label): Argument is not a Hyperbole button symbol, '%s'"
- hbut)))
-
- (fset 'hbut:label-p 'ebut:label-p)
- (fset 'hbut:label-to-key 'ebut:label-to-key)
-
- (defun hbut:report (&optional arg)
- "Pretty prints the attributes of a button or buttons.
-
- Takes an optional ARG interpreted as follows:
- a button symbol - report on that button;
- nil - report on button at point, if any;
- integer > 0 - report on all explicit buttons in buffer, alphabetize;
- integer < 1 - report on all explicit buttons in occurrence order;
-
- Returns number of buttons reported on or nil if none."
- (setq arg (cond ((or (integerp arg) (symbolp arg)) arg)
- ((listp arg)
- (if (integerp (setq arg (car arg))) arg 1))
- (t 1)))
- (let* ((but (if (and arg (symbolp arg)) arg (hbut:at-p)))
- (curr-key (and but (hattr:get but 'lbl-key)))
- (key-src (or (and but (hattr:get but 'loc)) (hbut:key-src)))
- (lbl-lst (cond ((not arg)
- (if curr-key (list (ebut:key-to-label curr-key))))
- ((symbolp arg) (if curr-key
- (list (hbut:key-to-label
- (hattr:get arg 'lbl-key)))))
- ((< arg 1) (ebut:list))
- (t (sort (ebut:list)
- (function
- (lambda (s1 s2)
- (string< (downcase s1) (downcase s2))))))))
- (key-buf (current-buffer))
- (buf-name (hypb:help-buf-name))
- (attribs))
- (if lbl-lst
- (progn
- (with-output-to-temp-buffer buf-name
- (princ hbut:source-prefix)
- (prin1 key-src)
- (terpri)
- (terpri)
- (mapcar
- (function
- (lambda (lbl)
- (if (setq but
- (cond ((or (null arg) (symbolp arg)) but)
- (t (ebut:get (ebut:label-to-key lbl) key-buf)))
- attribs (hattr:list but))
- (progn
- (princ (if (ibut:is-p but)
- lbl
- (concat ebut:start lbl ebut:end)))
- (terpri)
- (let ((doc (actype:doc but (= 1 (length lbl-lst)))))
- (if doc
- (progn
- (princ " ")
- (princ doc)
- (terpri))))
- (hattr:report
- ;; (if (eq (car (cdr (memq 'categ attribs))) 'explicit)
- ;; (memq 'action attribs)
- ;; (memq 'categ attribs))
- attribs)
- (terpri))
- )))
- lbl-lst))
- (length lbl-lst)))))
-
- (defun hbut:source (&optional full)
- "Returns Hyperbole source buffer or file given at point.
- If a file, always returns a full path if optional FULL is non-nil."
- (goto-char (match-end 0))
- (cond ((looking-at "#<buffer \\([^ \n]+\\)>")
- (get-buffer (buffer-substring (match-beginning 1)
- (match-end 1))))
- ((looking-at "\".+\"")
- (let* ((file (buffer-substring (1+ (match-beginning 0))
- (1- (match-end 0))))
- (absolute (file-name-absolute-p file)))
- (if (and full (not absolute))
- (expand-file-name file default-directory)
- file)))))
-
- (fset 'hbut:summarize 'hbut:report)
-
- (defvar hbut:current nil
- "Currently selected Hyperbole button.
- Available to action routines.")
-
- (defconst hbut:source-prefix moccur-source-prefix
- "String found at start of a buffer containing only a hyper-button menu.
- This expression should be followed immediately by a file-name indicating the
- source file for the buttons in the menu, if any.")
-
- ;;; ========================================================================
- ;;; htype class - Hyperbole Types, e.g. action and implicit button types
- ;;; ========================================================================
-
- (require 'set)
-
- (defun htype:body (htype-sym)
- "Return body for HTYPE-SYM. If HTYPE-SYM is nil, return nil."
- (and htype-sym (hypb:indirect-function htype-sym)))
-
- (defun htype:category (type-category)
- "Return list of symbols in Hyperbole TYPE-CATEGORY in priority order.
- Symbols contain category component.
- TYPE-CATEGORY should be 'actypes, 'ibtypes or nil for all."
- (let ((types (symset:get type-category 'symbols))
- (categ-name (symbol-name type-category)))
- (mapcar (function
- (lambda (type)
- (intern (concat categ-name "::" (symbol-name type)))))
- types)))
-
- ;; Thanks to JWZ for help on this.
- (defmacro htype:create (type type-category doc params body property-list)
- "Create a new Hyperbole TYPE within TYPE-CATEGORY (both unquoted symbols).
- Third arg DOC is a string describing the type.
- Fourth arg PARAMS is a list of parameters to send to the fifth arg BODY,
- which is a list of forms executed when the type is evaluated.
- Sixth arg PROPERTY-LIST is attached to the new type's symbol.
-
- This symbol is returned."
- (let* ((sym (htype:symbol type type-category))
- (action (nconc (list 'defun sym params doc) body)))
- (` (progn
- (, action)
- (setplist '(, sym) (, property-list))
- (symset:add '(, type) '(, type-category) 'symbols)
- (run-hooks 'htype:create-hook)
- '(, sym)))))
-
- (defun htype:delete (type type-category)
- "Delete a Hyperbole TYPE derived from TYPE-CATEGORY (both symbols).
- Return the Hyperbole symbol for the TYPE if it existed, else nil."
- (let* ((sym (htype:symbol type type-category))
- (exists (fboundp 'sym)))
- (setplist sym nil)
- (symset:delete type type-category 'symbols)
- (fmakunbound sym)
- (run-hooks 'htype:delete-hook)
- (and exists sym)))
-
- (defun htype:doc (type)
- "Return documentation for Hyperbole TYPE, a symbol."
- (documentation type))
-
- (defun htype:names (type-category &optional sym)
- "Return list of current names for Hyperbole TYPE-CATEGORY in priority order.
- Names do not contain category component.
- TYPE-CATEGORY should be 'actypes, 'ibtypes or nil for all.
- When optional SYM is given, return the name for that symbol only, if any."
- (let ((types (symset:get type-category 'symbols))
- (sym-name (and sym (symbol-name sym))))
- (if sym-name
- ;; Strip category from sym-name before looking for a match.
- (progn (if (string-match "::" sym-name)
- (setq sym (intern (substring sym-name (match-end 0)))))
- (if (memq sym types) (symbol-name sym)))
- (mapcar 'symbol-name types))))
-
- ;;; ------------------------------------------------------------------------
-
- (defun htype:symbol (type type-category)
- "Return Hyperbole type symbol composed from TYPE and TYPE-CATEGORY (both symbols)."
- (intern (concat (symbol-name type-category) "::"
- (symbol-name type))))
-
- ;;; ========================================================================
- ;;; ibut class - Implicit Hyperbole Buttons
- ;;; ========================================================================
-
- (defun ibut:at-p (&optional key-only)
- "Returns symbol for implicit button at point, else nil.
- With optional KEY-ONLY, returns only the label key for button."
- (let ((types (htype:category 'ibtypes))
- ;; Global var used in (hact) function, don't delete.
- (hrule:action 'actype:identity)
- (itype)
- (args)
- (is-type))
- (or key-only (hattr:clear 'hbut:current))
- (while (and (not is-type) types)
- (setq itype (car types))
- (if (setq args (funcall itype))
- (setq is-type itype)
- (setq types (cdr types))))
- (if is-type
- (if key-only
- (hattr:get 'hbut:current 'lbl-key)
- (hattr:set 'hbut:current 'loc (save-excursion
- (hbut:key-src 'full)))
- (hattr:set 'hbut:current 'categ is-type)
- (or (hattr:get 'hbut:current 'args)
- (not (listp args))
- (progn
- (hattr:set 'hbut:current 'actype
- (or
- ;; Hyperbole action type
- (intern-soft (concat "actypes::"
- (symbol-name (car args))))
- ;; Regular Emacs Lisp function symbol
- (car args)
- ))
- (hattr:set 'hbut:current 'args (cdr args))))
- 'hbut:current))))
-
- (defun ibut:is-p (object)
- "Returns non-nil if object denotes an implicit Hyperbole button."
- (if (symbolp object)
- (let ((categ (hattr:get object 'categ)))
- (and categ (string-match "^ibtypes::" (symbol-name categ))))))
-
- (defun ibut:label-p ()
- "Returns key for Hyperbole implicit button label that point is on or nil."
- (ibut:at-p 'key-only))
-
- (defun ibut:label-set (label &optional start end)
- "Sets current implicit button attributes from LABEL and START, END position.
- START and END are OPTIONAL.
- If LABEL is a list, it is assumed to contain all arguments."
- (cond ((stringp label)
- (hattr:set 'hbut:current 'lbl-key (hbut:label-to-key label))
- (and start (hattr:set 'hbut:current 'lbl-start start))
- (and end (hattr:set 'hbut:current 'lbl-end end)))
- ((and label (listp label))
- (hattr:set 'hbut:current 'lbl-key (hbut:label-to-key (car label)))
- (hattr:set 'hbut:current 'lbl-start (nth 1 label))
- (hattr:set 'hbut:current 'lbl-end (nth 2 label)))
- (t (error "(ibut:label-set): Invalid label arg: '%s'" label)))
- t)
-
- ;;; ========================================================================
- ;;; ibtype class - Implicit button types
- ;;; ========================================================================
-
- (fset 'defib 'ibtype:create)
- (put 'ibtype:create 'lisp-indent-function 'defun)
- (defmacro ibtype:create (type params doc at-p &optional to-p style)
- "Creates implicit button TYPE (unquoted sym) with PARAMS, described by DOC.
- PARAMS are presently ignored.
-
- AT-P is a boolean form of no arguments which determines whether or not point
- is within a button of this type.
- Optional TO-P is a boolean form which moves point immediately after the next
- button of this type within the current buffer and returns a list of (button-
- label start-pos end-pos), or nil when none is found.
- Optional STYLE is a display style specification to use when highlighting
- buttons of this type; most useful when TO-P is also given.
-
- Returns symbol created when successful, else nil. Nil indicates that action
- type for ibtype is presently undefined."
- (if type
- (let ((to-func (if to-p (action:create nil (list to-p))))
- (at-func (list at-p)))
- (` (htype:create (, type) ibtypes (, doc) nil (, at-func)
- (list 'to-p (, to-func) 'style (, style)))))))
-
- (defun ibtype:delete (type)
- "Deletes an implicit button TYPE (a symbol).
- Returns TYPE's symbol if it existed, else nil."
- (htype:delete type 'ibtypes))
-
- ;;; ========================================================================
- ;;; symset class - Hyperbole internal symbol set maintenance
- ;;; ========================================================================
-
- (require 'set)
-
- (defun symset:add (elt symbol prop)
- "Adds ELT to SYMBOL's PROP set.
- Returns nil iff ELT is already in SET. Uses 'eq' for comparison."
- (let* ((set (get symbol prop))
- (set:equal-op 'eq)
- (new-set (set:add elt set)))
- (and new-set (put symbol prop new-set))))
-
- (fset 'symset:delete 'symset:remove)
-
- (defun symset:get (symbol prop)
- "Returns SYMBOL's PROP set."
- (get symbol prop))
-
- (defun symset:remove (elt symbol prop)
- "Removes ELT from SYMBOL's PROP set and returns the new set.
- Assumes PROP is a valid set. Uses 'eq' for comparison."
- (let ((set (get symbol prop))
- (set:equal-op 'eq))
- (put symbol prop (set:remove elt set))))
-
-
- (provide 'hbut)
-