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hbut.el
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;;; hbut.el --- GNU Hyperbole button constructs -*- lexical-binding: t; -*-
;;
;; Author: Bob Weiner
;;
;; Orig-Date: 18-Sep-91 at 02:57:09
;; Last-Mod: 5-Jan-25 at 11:27:31 by Bob Weiner
;;
;; SPDX-License-Identifier: GPL-3.0-or-later
;;
;; Copyright (C) 1991-2024 Free Software Foundation, Inc.
;; See the "HY-COPY" file for license information.
;;
;; This file is part of GNU Hyperbole.
;;; Commentary:
;;; Code:
;;; ************************************************************************
;;; Other required Elisp libraries
;;; ************************************************************************
(eval-and-compile (mapc #'require '(cl-lib elisp-mode help-mode hversion
hmoccur hbmap htz hbdata hact
hui-select view)))
(require 'hmouse-drv) ; For `hui--ignore-action-key-depress-prev-point'.
;;; ************************************************************************
;;; Public declarations
;;; ************************************************************************
(declare-function www-url "hsys-www" (url))
(defconst hbut:max-len 200
"Maximum length of a Hyperbole button label.
If 0, there is no limit and searches for button end delimiters can go
as far as the end of the buffer.
Use the function, (hbut:max-len), to read the proper value.")
(defsubst hbut:max-len ()
"Return the value of `hbut:max-len' if non-zero else (point-max)."
(if (zerop hbut:max-len) (point-max) hbut:max-len))
(defvar hproperty:but-face)
(defvar hproperty:ibut-face)
(defvar hywiki-org-link-type)
(declare-function hargs:delimited "hargs")
(declare-function hargs:read-match "hargs")
(declare-function hpath:find-noselect "hpath")
(declare-function hpath:find "hpath")
(declare-function hpath:substitute-var "hpath")
(declare-function hpath:symlink-referent "hpath")
(declare-function hpath:www-p "hpath")
(declare-function hpath:shorten "hpath")
(declare-function hsys-org-block-start-at-p "hsys-org")
(declare-function hsys-org-src-block-start-at-p "hsys-org")
(declare-function hui:buf-writable-err "hui")
(declare-function hui:ebut-rename "hui")
(declare-function hui:ibut-rename "hui")
(declare-function hui:key-dir "hui")
(declare-function hui:key-src "hui")
(declare-function hywiki-get-referent "hywiki")
(declare-function kbd-key:act "hib-kbd")
(declare-function kbd-key:is-p "hib-kbd")
(declare-function org-context "org")
(declare-function hpath:file-position-to-line-and-column "hpath")
(declare-function hyrolo-hdr-move-after-p "hyrolo")
(declare-function smart-eolp "hui-mouse")
;;; ************************************************************************
;;; Private variables
;;; ************************************************************************
(defvar hyperb:microsoft-os-p)
;; Move up internal defconst to appear before their use
(defconst ebut:label-start "<("
"String matching the start of a Hyperbole explicit hyper-button.")
(defconst ebut:label-end ")>"
"String matching the end of a Hyperbole explicit hyper-button.")
(defconst hbut:instance-sep ":"
"String of one character, separates an ebut label from its instance num.")
;; Move up internal defvar
(defvar hattr:filename
(if hyperb:microsoft-os-p "_hypb" ".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!")
(defvar ibut:label-separator-regexp "\\s-*[-:=|]*\\s-+"
"Regular expression that separates an implicit button name from its button text.")
(defvar ibut:label-separator " - "
"Default separator string inserted between implicit button name and its text.
See also `ibut:label-separator-regexp' for all valid characters that may be
inserted manually to separate an implicit button label from its text.")
(defconst hbut:source-prefix moccur-source-prefix
"String prefix for lines indicating the source of the matches.
It should not contain any characters needing regular expression quoting.
This expression should be followed immediately by a buffer or file name
indicating the source of any of its Hyperbole buttons.")
;;; ************************************************************************
;;; 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.")
(defun ebut:act (&optional ebut)
"Perform action for optional explicit Hyperbole button symbol EBUT.
Default is the symbol hbut:current."
(interactive (list (hbut:get (hargs:read-match "Activate labeled Hyperbole button: "
(ebut:alist)
nil t nil 'ebut))))
(unless ebut
(setq ebut 'hbut:current))
(if (ebut:is-p ebut)
(hbut:act ebut)
(hypb:error "(ebut:act): Expected an ebut, instead given: `%s'" ebut)))
(defun ebut:act-label (label)
"Activate Hyperbole explicit button with LABEL from the current buffer."
(interactive (list (hargs:read-match "Activate explicit button labeled: "
(ebut:alist)
nil t nil 'ebut)))
(let* ((lbl-key (hbut:label-to-key label))
(but (ebut:get lbl-key)))
(if but
(hbut:act but)
(hypb:error "(ebut:act-label): No explicit button labeled: `%s'" label))))
(defun ebut:alist (&optional file)
"Return alist of ebuts in FILE or the current buffer.
Each element is a list of just an explicit button label. For use
as a completion table."
(mapcar #'list (ebut:list file)))
(defun ebut:at-p (&optional start-delim end-delim)
"Return explicit Hyperbole button at point or nil.
Assume point is within first line of button label, if at all.
Optional START-DELIM and END-DELIM are strings that override default
button delimiters."
(ebut:get nil nil nil start-delim end-delim))
(defun ebut:create (&optional but-sym)
"Create Hyperbole explicit button based on optional BUT-SYM.
Default is the symbol 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, return any instance number to append to button label
except when instance number would be \"1\", then return t. On failure,
return nil.
If successful, leave 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)
"Delete Hyperbole explicit button based on optional BUT-SYM.
Default is the symbol hbut:current.
Return entry deleted (a list of attribute values) or nil."
(unless but-sym
(setq but-sym (ebut:at-p)))
(when (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:edit (&optional lbl-key but-sym new-lbl-key)
"Edit explicit Hyperbole button from optional LBL-KEY and BUT-SYM.
Defaults are the key for any button label at point and `hbut:current'.
If successful, return button's instance number, except when instance
number is 1, then return t. On failure, as when button does not exist,
return nil.
Do not save button data buffer."
(save-excursion
(let ((lbl-instance (hbdata:write lbl-key but-sym new-lbl-key)))
(run-hooks 'ebut-edit-hook)
lbl-instance)))
(defun ebut:get (&optional lbl-key buffer key-src start-delim end-delim)
"Return explicit Hyperbole button symbol given by LBL-KEY and BUFFER.
KEY-SRC is given when retrieving global buttons and is the full
source pathname. START-DELIM and END-DELIM are strings that
override default button delimiters.
Retrieve button data, convert into a button object and return a symbol
which references the button.
All arguments are optional. When none are given, return a symbol for
the button that point is within. BUFFER defaults to the current
buffer.
Return nil if no matching button is found."
(hattr:clear 'hbut:current)
(save-excursion
(let (but-data
key-dir
key-file
lbl-end
lbl-key-and-pos
lbl-start)
(unless lbl-key
(setq lbl-key-and-pos (ebut:label-p nil start-delim end-delim t)
lbl-key (nth 0 lbl-key-and-pos)
lbl-start (nth 1 lbl-key-and-pos)
lbl-end (nth 2 lbl-key-and-pos)))
(when buffer
(if (bufferp buffer)
(set-buffer buffer)
(error "(ebut:get): Invalid buffer argument: %s" buffer)))
(when (not key-src)
(when (not (equal lbl-key (ebut:label-p nil start-delim end-delim)))
(goto-char (point-min))
(ebut:next-occurrence lbl-key))
(when (setq key-src (ebut:to-key-src 'full))
;; `ebut:to-key-src' sets current buffer to key-src buffer.
(setq buffer (current-buffer))))
(when (and (stringp lbl-key) key-src)
(when (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)))
(when but-data
(hattr:set 'hbut:current 'lbl-key lbl-key)
(when lbl-start
(hattr:set 'hbut:current 'lbl-start lbl-start))
(when lbl-end
(hattr:set 'hbut:current 'lbl-end lbl-end))
(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 (hbdata:actype 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)
"Return non-nil if OBJECT is a symbol representing an explicit Hyperbole button."
(and (symbolp object)
(eq (hattr:get object 'categ) 'explicit)))
(defun ebut:key (ebut)
"Return the key for Hyperbole explicit button symbol EBUT."
(if (ebut:is-p ebut)
(hattr:get ebut 'lbl-key)
(error "(ebut:key): Argument is not a Hyperbole explicit button symbol, `%s'"
ebut)))
(defun ebut:key-of-label-p (key label)
"Return t iff KEY matches to LABEL in a case insensitive manner."
(and (stringp key) (stringp label)
(equal key (downcase (ebut:label-to-key label)))))
(defalias 'ebut:to-key-src #'hbut:to-key-src)
(defalias 'ebut:key-src-set-buffer #'hbut:key-src-set-buffer)
(defalias 'ebut:key-src-fmt #'hbut:key-src-fmt)
(defalias 'ebut:key-to-label #'hbut:key-to-label)
(defvar hbut:max-len)
(defun ebut:label-p (&optional as-label start-delim end-delim pos-flag two-lines-flag)
"Return key for the explicit button label that point is within, else nil.
This is the normalized key form of the explicit button's label.
Assume point is within the first line of any button label. All
following arguments are optional. If AS-LABEL is non-nil, return
label rather than the key derived from the label. START-DELIM
and END-DELIM are strings that override default button
delimiters. With POS-FLAG non-nil, return the list of label-or-key,
but-start-position, but-end-position. Positions include
delimiters. With TWO-LINES-FLAG non-nil, constrain label search
to two lines."
(let ((opoint (point))
(quoted "\\(^\\|[^\\{$]\\)")
;; For <> delimited action buttons which can be long
;; sexpressions, don't enforce the normal, short button length
;; limit. Setting this to 0 means unlimited length, assuming
;; the TWO-LINES-FLAG is nil.
(hbut:max-len
(if (and (string-equal start-delim "<")
(string-equal end-delim ">"))
0
hbut:max-len))
npoint start lbl-key end but-start but-end start-regexp end-regexp)
(unless start-delim (setq start-delim ebut:label-start))
(unless end-delim (setq end-delim ebut:label-end))
(setq npoint (+ opoint (length start-delim))
start-regexp (regexp-quote start-delim)
end-regexp (regexp-quote end-delim))
;; Ensure label is not blank and point is within matching delimiters
(save-excursion
(forward-line 0)
(while (and (progn
(while (and (< (point) npoint)
(re-search-forward (concat quoted start-regexp) npoint t))
(setq start t))
start)
;; Handle expressions like:
;; { M-x shell RET M-> (cd ${hyperb:dir}) RET }
(save-excursion
(when (eq ?\( (char-syntax (preceding-char)))
(ignore-errors (forward-char -1) (forward-list)))
(< (point) opoint))
(re-search-forward (concat "[^\\{]" end-regexp) opoint t))
(setq start nil))
(when start
(setq start (point)
but-start (match-end 1))
(if (eq ?\( (char-syntax (preceding-char)))
(condition-case ()
(progn
(forward-char -1)
(forward-list)
(forward-char -2))
(error (goto-char (max (1- opoint) start))))
(goto-char (max (1- opoint) start)))
(when two-lines-flag
(save-excursion
(forward-line 2)
(setq hbut:max-len (- (point) start))))
(and (< (point) (+ start (hbut:max-len)))
(re-search-forward (concat quoted end-regexp) (+ start (hbut:max-len)) t)
(setq but-end (point)
end (- (point) (length end-delim))
lbl-key (ebut:label-to-key (buffer-substring-no-properties 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))))))))
(defalias 'ebut:label-regexp #'hbut:label-regexp)
(defalias 'ebut:label-instances-regexp #'hbut:label-instances-regexp)
(defalias 'ebut:label-to-key #'hbut:label-to-key)
(defun ebut:list (&optional file loc-p)
"Return list of explicit button labels from in FILE or the current buffer.
Remove duplicate labels if optional LOC-P is omitted. With LOC-P, return
list of elements (label start end) where start and end are the buffer
positions at which the button delimiter begins and ends."
(interactive)
(setq file (if file
(when (file-exists-p file)
(find-file-noselect file))
(current-buffer)))
(when file
(set-buffer file)
(let ((buts (ebut:map (if loc-p
(lambda (lbl start end)
;; Normalize label spacing
(list (ebut:key-to-label (ebut:label-to-key lbl))
start end))
(lambda (lbl _start _end)
;; Normalize label spacing
(ebut:key-to-label (ebut:label-to-key lbl)))))))
(if loc-p buts (when buts (apply #'set:create buts))))))
(defalias 'map-ebut #'ebut:map)
(defun ebut:map (but-func &optional regexp-match include-delims)
"Apply BUT-FUNC to the explicit buttons in the visible part of current buffer.
If REGEXP-MATCH is non-nil, only buttons which match this argument are
considered.
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)."
(hbut:map-type but-func ebut:label-start ebut:label-end regexp-match include-delims))
(defun ebut:next-occurrence (lbl-key &optional buffer)
"Move point to next occurrence of button with LBL-KEY in optional BUFFER.
BUFFER defaults to current buffer. It may be a buffer name.
Return 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:label-start)))))
(defun ebut:operate (curr-label new-label)
"Create an in-buffer ebutton named CURR-LABEL. Modify if NEW-LABEL is given.
If CURR-LABEL is nil, the text in the active region is used as the
button label, if any, otherwise, an error is signaled.
Return instance string appended to label to form a per-buffer unique
label; nil if label is already unique. Signal 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))
(new-lbl-key (ebut:label-to-key new-label))
(modify new-label)
(new-instance-flag))
(when (and new-label (or (not (stringp new-label)) (string-empty-p new-label)))
(hypb:error "(ebut:operate): 'new-label' value must be a non-empty string, not: '%s'"
new-label))
(when (and (null curr-label) (not (use-region-p)))
(hypb:error "(ebut:operate): region must be active when 'curr-label' is nil"))
;; Error when on a read-only part of a buffer's text
(when (plist-member (text-properties-at (point)) 'read-only)
(hypb:error "(ebut:operate): Point must not be on a read-only Org element"))
;; Error when on an implicit button
(when (or (eq (hattr:get 'hbut:current 'categ) 'implicit)
(string-prefix-p "ibtypes::" (symbol-name (hattr:get 'hbut:current 'categ))))
(hypb:error "(ebut:operate): Point must not be on an implicit button: %s"
(ibut:label-to-key (hattr:get 'hbut:current 'lbl-key))))
;; Error when on an Emacs push-button
(when (plist-member (text-properties-at (point)) 'button)
(hypb:error "(ebut:operate): Point must not be on an Emacs push-button: %s"
(button-label (button-at (point)))))
;; Error when in read-only contexts of an Org file
(when (hsys-org-at-read-only-p)
(hypb:error "(ebut:operate): Point must not be in a read-only Org context"))
(unless new-label
(setq new-label curr-label))
(hattr:set 'hbut:current 'lbl-key (ebut:label-to-key new-label))
(save-excursion
(when (setq new-instance-flag
(if modify (ebut:edit lbl-key nil new-lbl-key) (ebut:create)))
(when (hmail:editor-p)
(hmail:msg-narrow))))
(cond (modify
;; Rename all occurrences of button - those with same label
(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))))
(when at-but
(ebut:delimit (nth 1 but-key-and-pos)
(nth 2 but-key-and-pos)
new-instance-flag))
(cond ((ebut:map
(lambda (_lbl start end)
(delete-region start end)
(ebut:delimit
(point)
(progn (insert new-label) (point))
new-instance-flag))
lbl-regexp 'include-delims))
(at-but)
((hypb:error "(ebut:operate): No button matching: %s" curr-label)))))
(new-instance-flag
;; Add a new button recording its start and end positions
(let (start end mark prev-point buf-lbl)
(cond ((not curr-label)
(setq start (point))
(insert new-label)
(setq end (point)))
((and (hmouse-use-region-p)
(if (hyperb:stack-frame
'(hui:ebut-create hui:ebut-edit hui:ebut-edit-region
hui:ebut-link-create hui:gbut-create
hui:gbut-edit ebut:program
hui:ibut-create hui:ibut-edit
hui:ibut-link-create ibut:program))
;; Ignore action-key-depress-prev-point
(progn (setq mark (marker-position (mark-marker))
start (region-beginning)
end (region-end)
buf-lbl (buffer-substring-no-properties start end))
(equal buf-lbl curr-label))
;; Utilize any action-key-depress-prev-point
(setq mark (marker-position (mark-marker)))
(setq prev-point (and action-key-depress-prev-point
(marker-position action-key-depress-prev-point)))
(setq start (if (and prev-point mark (<= prev-point mark))
prev-point
(region-beginning))
end (if (and prev-point mark (> prev-point mark))
prev-point
(region-end))
buf-lbl (buffer-substring-no-properties start end))
(equal buf-lbl curr-label)))
nil)
((progn (when start (goto-char start))
(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 new-instance-flag)
(goto-char start)))
(t (hypb:error
"(ebut:operate): Operation failed. Check button attribute permissions: %s"
hattr:filename)))
;; Append any new-instance-flag string to the button label
(when (stringp new-instance-flag)
(setq new-label (concat new-label new-instance-flag))
(hattr:set 'hbut:current 'lbl-key (ebut:label-to-key new-label)))
;; Position point
(let ((new-key (ebut:label-to-key new-label)))
(cond ((equal (ebut:label-p) new-key)
;; In case right before the start of the desired
;; button's delimiters.
(forward-char 2) (search-backward ebut:label-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:label-start))))))
(when (or (not (hypb:buffer-file-name)) (hmail:editor-p) (hmail:reader-p))
(widen)
(hmail:msg-narrow))
;; new-instance-flag might be 't which we don't want to return.
(when (stringp new-instance-flag) new-instance-flag)))
(defun ebut:program (label actype &rest args)
"Programmatically create an explicit Hyperbole button at point.
Create button from LABEL, ACTYPE (action type), and optional actype ARGS.
Insert LABEL text at point surrounded by <( )> delimiters, adding any
necessary instance number of the button after the LABEL. ACTYPE may
be a Hyperbole action type name (from defact) or an Emacs Lisp
function, followed by a list of arguments for the actype, aside from
the button LABEL which is automatically provided as the first argument.
For interactive creation, use `hui:ebut-create' instead."
(save-excursion
(let ((but-buf (current-buffer))
(actype-sym (actype:action actype)))
(hui:buf-writable-err but-buf "ebut-create")
(condition-case err
(progn
(hattr:clear 'hbut:current)
(hattr:set 'hbut:current 'categ 'explicit)
(hattr:set 'hbut:current 'loc (hui:key-src but-buf))
(hattr:set 'hbut:current 'dir (hui:key-dir but-buf))
(if (or (and actype-sym (fboundp actype-sym))
(functionp actype))
(hattr:set 'hbut:current 'actype actype)
(error "(%s)" actype))
(hattr:set 'hbut:current 'args args)
(ebut:operate label nil))
(error (hattr:clear 'hbut:current)
(if (and (listp (cdr err)) (= (length (cdr err)) 1))
(error "(ebut:program): actype arg must be a bound symbol (not a string): %S" actype)
(error "(ebut:program): %S" err)))))))
(defun ebut:search (string out-buf &optional match-part)
"Write explicit button lines matching STRING to OUT-BUF.
Search across all files into which the user has previously saved
explicit buttons. By default, find matches for whole button
labels only; optional MATCH-PART enables partial matches."
(let* ((buffers (mapcar (lambda (dir)
(expand-file-name hattr:filename dir))
(hbmap:dir-list)))
(total 0)
(firstmatch))
(with-current-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 (hypb: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 (line-end-position)
start (progn
(goto-char (match-beginning 0))
(line-beginning-position))
lns (buffer-substring start end))
(goto-char end)
(with-current-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:to (lbl-key)
"Find the nearest explicit button with LBL-KEY (a label or label key).
Search within the visible portion of the current buffer. Leave
point inside the button label. Return the symbol for the button,
else nil.
When LBL-KEY is nil, return the ebutton at point or nil if none."
(if lbl-key
(hbut:funcall (lambda (lbl-key _buffer _key-src)
;; Handle a label given rather than a label key
(if (string-match-p "\\s-" lbl-key)
(setq lbl-key (ebut:label-to-key lbl-key)))
(let ((regexp (hbut:label-regexp lbl-key t))
pos
found)
(save-excursion
;; Since point might be in the middle of the matching button,
;; move to the start of line to ensure don't miss it when
;; searching forward.
(forward-line 0)
;; re-search forward
(while (and (not found) (re-search-forward regexp nil t))
(setq pos (match-beginning 0)
found (equal (ebut:label-p nil nil nil nil t) lbl-key)))
;; re-search backward
(while (and (not found) (re-search-backward regexp nil t))
(setq pos (match-beginning 0)
found (equal (ebut:label-p nil nil nil nil t) lbl-key))))
(when found
(goto-char pos)
(ebut:at-p))))
lbl-key
(current-buffer))
(ebut:at-p)))
;;; ------------------------------------------------------------------------
(defun ebut:delimit (start end instance-flag)
"Delimit explicit button label spanning region START to END in current buffer.
If button is already delimited or delimit fails, return nil, else t.
Insert INSTANCE-FLAG after END, before ending delimiter."
(goto-char start)
(when (looking-at (regexp-quote ebut:label-start))
(forward-char (length ebut:label-start)))
(unless (ebut:label-p)
(setq start (move-marker (make-marker) start)
end (move-marker (make-marker) end))
(set-marker-insertion-type end t)
;; instance-flag may be 't to indicate don't add an instance number
(unless (stringp instance-flag)
(setq instance-flag ""))
(insert ebut:label-start)
(goto-char end)
(insert instance-flag ebut:label-end)
;; Insert any comment delimiter before the start marker.
(set-marker-insertion-type start t)
(hbut:comment start end)
(when (fboundp 'hproperty:but-add)
(hproperty:but-add start end hproperty:but-face))
(goto-char end)
(move-marker start nil)
(move-marker end nil)
t))
(defun ebut:match-regexp (match-keys match-part)
"Return regexp to match to all explicit button keys from MATCH-KEYS."
(setq match-part (if match-part
(concat "[^" (substring ebut:label-end -1) "]*")
"[ \t\n\r]*"))
(concat
(regexp-quote ebut:label-start) match-part
"\\(" (mapconcat (lambda (key) (ebut:label-regexp key 'no-delim))
match-keys "\\|")
"\\)" match-part (regexp-quote ebut:label-end)))
;;; ========================================================================
;;; gbut class - Global Hyperbole buttons - activated by typing label name
;;; ========================================================================
(defun gbut:act (label)
"Activate Hyperbole global button with LABEL."
(interactive (list (hargs:read-match "Activate global button labeled: "
(mapcar #'list (gbut:label-list))
nil t nil 'gbut)))
(cond ((null label)
(error "(gbut:act): You have not created any global buttons"))
((equal label "")
(error "(gbut:act): Please try again and type ? for a list of existing global button names"))
(t (let* ((lbl-key (hbut:label-to-key label))
(but (gbut:get lbl-key)))
(if but
(progn
;; Ensure gbut is activated with current-buffer as
;; the context, not the gbut's source buffer.
(hattr:set but 'loc (current-buffer))
(hbut:act but))
(error "(gbut:act): No global button found for label: %s" label))))))
(defun gbut:delete (&optional lbl-key)
"Delete Hyperbole global button based on optional LBL-KEY or button at point.
Return entry deleted (a list of attribute values) or nil."
(hbut:delete lbl-key nil (gbut:file)))
(defun gbut:ebut-program (label actype &rest args)
"Programmatically create a global explicit Hyperbole button at point.
Create button from LABEL, ACTYPE (action type), and optional actype ARGS.
Insert LABEL text at the end of the personal/global button file
surrounded by <( )> delimiters, adding any necessary instance
number of the button after the LABEL. ACTYPE may be a Hyperbole
action type name (from defact) or an Emacs Lisp function,
followed by a list of arguments for the actype, aside from the
button LABEL which is automatically provided as the first
argument.
For interactive creation, use `hui:gbut-create' instead."
(save-excursion
(with-current-buffer (hpath:find-noselect (expand-file-name hbmap:filename hbmap:dir-user))
(save-excursion
(goto-char (point-max))
(when (not (bolp))
(insert "\n"))
(eval `(ebut:program ',label ',actype ,@args))))))
(defun gbut:file ()
"Return the absolute path for the global button (those accessed by name) file."
(expand-file-name hbmap:filename hbmap:dir-user))
(defun gbut:get (&optional lbl-key)
"Return global button symbol given by optional LBL-KEY if found in (gbut:file).
Retrieve any button data, convert into a button object and return a symbol
which references the button.
All arguments are optional. When none are given, return a symbol for
the button that point is within.
Return nil if no matching button is found."
(hbut:get lbl-key nil (gbut:file)))
(defun gbut:help (label)
"Display help for Hyperbole global button with LABEL."
(interactive (list (hargs:read-match "Report on global button labeled: "
(mapcar #'list (gbut:label-list))
nil t nil 'hbut)))
(let* ((lbl-key (hbut:label-to-key label))
(but (hbut:get lbl-key nil (gbut:file))))
(if but
(hbut:report but)
(error "(gbut:help): No global button labeled: %s" label))))
(defun gbut:label-list ()
"Return list of global button labels."
(mapcar #'hbut:key-to-label (gbut:key-list)))
(defun gbut:label-p (&optional as-label start-delim end-delim pos-flag two-lines-flag)
"Return key for the Hyperbole global button label that point is within, else nil.
This is the normalized key form of the explicit button's label.
Assume point is within the first line of any button label. All
following arguments are optional. If AS-LABEL is non-nil, return
label rather than the key derived from the label. START-DELIM
and END-DELIM are strings that override default button
delimiters. With POS-FLAG non-nil, return the list of label-or-key,
but-start-position, but-end-position. Positions include
delimiters. With TWO-LINES-FLAG non-nil, constrain label search
to two lines."
(when (equal (hypb:buffer-file-name) (gbut:file))
(hbut:label-p as-label start-delim end-delim pos-flag two-lines-flag)))
(defun gbut:save-buffer ()
"Save global button file after an edit."
(with-current-buffer (find-file-noselect (gbut:file))
(save-buffer)))
(defun gbut:to (lbl-key)
"Find the global button with LBL-KEY (a label or label key).
Find it within the visible portion of the global button file.
Leave point inside the button label, if it has one.
Return the symbol for the button when found, else nil."
(when (file-readable-p (gbut:file))
(let ((obuf (current-buffer))
(opoint (point))
found)
(set-buffer (find-file-noselect (gbut:file)))
(setq found (hbut:to lbl-key))
(if found
(hpath:display-buffer (current-buffer) 'this-window)
(set-buffer obuf)
(goto-char opoint))
found)))
;;; ------------------------------------------------------------------------
(defun gbut:key-list ()
"Return list of global button label keys."
(nconc (gbut:ebut-key-list) (gbut:ibut-key-list)))
(defun gbut:ebut-key-list ()
"Return a list of explicit button label keys from the global button file."
(save-excursion
(save-restriction
(when (hbdata:to-entry-in-file (gbut:file))
(let (gbuts)
(save-restriction
(narrow-to-region (point) (if (search-forward "\f" nil t)
(point) (point-max)))
(goto-char (point-min))
(ignore-errors
(while (setq gbuts (cons (car (read (current-buffer))) gbuts))))
gbuts))))))
(defun gbut:ibut-key-list ()
"Return a list of implicit button label keys from the global button file."
(when (file-readable-p (gbut:file))
(save-excursion
(with-current-buffer (find-file-noselect (gbut:file))
(save-restriction
(widen)
(ibut:label-map (lambda (label _start _end) (ibut:label-to-key label))))))))
;;; ========================================================================
;;; hattr class
;;; ========================================================================
(defun hattr:attributes (obj-symbol)
"Return a list of OBJ-SYMBOL's attributes as symbols."
(when (symbolp obj-symbol)
(let* ((attr-val-list (symbol-plist obj-symbol))
(i -1))
(delq nil (mapcar (lambda (elt)
(setq i (1+ i))
(and (zerop (% i 2)) elt))
attr-val-list)))))
(defun hattr:clear (hbut)
"Remove 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)
"Copy attributes FROM-HBUT TO-HBUT, overwriting TO-HBUT attribute values.
Return TO-HBUT."
(mapc (lambda (hbut)
(or (and hbut (symbolp hbut))
(error "(hattr:clear): Argument not a Hyperbole button: %s" hbut)))
(list from-hbut to-hbut))
(hattr:clear to-hbut)
(setplist to-hbut (copy-sequence (symbol-plist from-hbut)))
to-hbut)
(defun hattr:emacs-button-attributes (button)
"Return a property list of an Emacs BUTTON."
(if (markerp button)
;; If on a text property button, button-at will
;; return a marker pointing to the button, not a
;; button with attributes.
(with-current-buffer (marker-buffer button)
(when (get-text-property button 'button)
(text-properties-at (point))))
(let ((category (hattr:emacs-button-is-p button)))
(when category
(symbol-plist category)))))
(defun hattr:emacs-button-is-p (button)
"If BUTTON is a valid Emacs button, return its category, else return nil."
(let* ((type (when (or (overlayp button) (markerp button))
(button-get button 'type)))
(category (when type (get type 'button-category-symbol))))
category))
(defun hattr:get (obj-symbol attr-symbol)
"Return value of OBJ-SYMBOL's attribute ATTR-SYMBOL."
(get obj-symbol attr-symbol))
(defun hattr:list (obj)
"Return a property list of OBJ's attributes.
Each pair of elements is: <attrib-name> <attrib-value>."
(cond ((hattr:emacs-button-attributes obj))
((symbolp obj)
(symbol-plist obj))
(t (error "(hattr:list): Argument not a symbol: %s" obj))))
(defun hattr:memq (attr-symbol obj-symbol)
"Return 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
(lambda (elt)
(setq i (1+ i))
(and (zerop (% i 2)) elt))
attr-val-list)))))
(when (memq attr-symbol attr-list) t))))
(defun hattr:report (attrib-list)
"Pretty print to `standard-output' attribute-value pairs from ATTRIB-LIST.
Ignore nil valued attributes. Return t unless no attributes are printed."
(let ((has-attr) attr val len)
(unless (or (null attrib-list) (not (listp attrib-list))
;; odd number of elements?
(= (% (length attrib-list) 2) 1))
(while (setq attr (car attrib-list))
(setq val (car (cdr attrib-list))
attrib-list (cdr (cdr attrib-list)))
(when val
(setq has-attr t
attr (symbol-name attr)
len (number-to-string (max (- 16 (length attr)) 1)))
(princ (format (concat " %s:%" len "s%S\n") attr " "
(let (str)
(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)))))))
has-attr)))
(defun hattr:save ()
"Save button attribute file for current directory, if modified.
Suitable for use as part of `write-file-functions'."