Blockattribute ein- oder ausblenden

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;;; ============================================================================
;;; CXATTVIS - Show or hide block attributes
;;; Version 1.0.0
;;; CADXChange LISP tools - https://cadxchange.net/resources/lisp/cxattvis
;;; Tested in: AutoCAD (full version). Other programs that run AutoLISP may work but are not tested.
;;; Copyright (c) CADXChange. Free for personal and commercial use; do not resell or
;;; republish it as a collection. Terms: https://cadxchange.net/legal/lisp-terms
;;; ============================================================================

;; Show or hide attributes of the block references in NAMES. TAG is a tag name or "*" for every attribute.
;; SHOW = T shows, nil hides. Returns how many attributes were changed.
(defun cx:attvis-run (names tag show / n flags)
  (setq n 0)
  (foreach e names
    (foreach a (cx:attribs e)
      (if (or (= tag "*") (= (strcase (cx:dxf 2 (entget a))) (strcase tag)))
        (progn
          (setq flags (cx:dxf 70 (entget a)))
          (cx:upd a 70 (if show (boole 1 flags -2) (boole 7 flags 1)))
          (setq n (1+ n)))))
    (entupd e))
  n)

(defun c:CXATTVIS ( / *error* cx:sv ss names tags tag act n)
  (setq *error* cx:err)
  (if (setq ss (cx:pick "\nSelect blocks with attributes: " '((0 . "INSERT") (66 . 1))))
    (progn
      (setq names (cx:ss->list ss)
            tags  (cx:tags names))
      (princ (strcat "\nAttributes in the selection: " (cx:join tags ", ")))
      (setq act (cx:ask-kw "Attributes" "Show Hide" "Hide")
            tag (cx:ask-str "Attribute tag (* for all)" "*"))
      (cx:start '(("CMDECHO" . 0)))
      (setq n (cx:attvis-run names tag (= act "Show")))
      (princ (strcat "\n" (itoa n) " attribute(s) " (if (= act "Show") "shown" "hidden") "."))
      (cx:end)))
  (princ))


;;; ---- Shared helpers (used by the command above; identical in every CADXChange tool) ----

(defun cx:dxf (code ed)
  (cdr (assoc code ed)))

;; The ATTRIB entities of a block reference, in order.
(defun cx:attribs (ins / e out)
  (setq e (entnext ins))
  (while (and e (= (cx:dxf 0 (entget e)) "ATTRIB"))
    (setq out (cons e out) e (entnext e)))
  (reverse out))

;; Change one group of an entity: (cx:upd ename 8 "LAYER1"); the group is added when missing.
(defun cx:upd (ename code value / ed old)
  (setq ed (entget ename) old (assoc code ed))
  (entmod (if old (subst (cons code value) old ed) (append ed (list (cons code value)))))
  (entupd ename))

;; Close the undo step and put the system variables back.
(defun cx:end ()
  (foreach v cx:sv (setvar (car v) (cdr v)))
  (command "_.UNDO" "_End")
  (setq cx:sv nil)
  (princ))

;; Error handler: restores everything, stays quiet on Esc.
(defun cx:err (msg)
  (if (> (getvar "CMDACTIVE") 0) (command))
  (cx:end)
  (if (and msg (not (wcmatch (strcase msg) "*BREAK*,*CANCEL*,*EXIT*")))
    (princ (strcat "\nError: " msg)))
  (princ))

;; Use the objects already selected, or ask the user to select; FILTER is an ssget filter list or nil.
(defun cx:pick (msg filter / ss)
  (setq ss (if filter (ssget "_I" filter) (ssget "_I")))
  (if (null ss)
    (progn
      (princ msg)
      (setq ss (if filter (ssget filter) (ssget)))))
  ss)

;; Selection set to a list of entity names.
(defun cx:ss->list (ss / i out)
  (setq i 0)
  (if ss
    (repeat (sslength ss)
      (setq out (cons (ssname ss i) out)
            i   (1+ i))))
  (reverse out))

;; The attribute tags found in a list of block references, each once, in order of appearance.
(defun cx:tags (names / out)
  (foreach e names
    (foreach a (cx:attribs e)
      (if (not (member (strcase (cx:dxf 2 (entget a))) (mapcar 'strcase out)))
        (setq out (append out (list (cx:dxf 2 (entget a))))))))
  out)

(defun cx:join (lst delim / out)
  (setq out "")
  (foreach s lst
    (setq out (if (= out "") s (strcat out delim s))))
  (if lst out ""))

;; Replace every OLD in STR by NEW (case sensitive).
(defun cx:replace (str old new / n out pos)
  (setq n (strlen old) out "" pos 1)
  (if (= n 0)
    str
    (progn
      (while (<= pos (1+ (- (strlen str) n)))
        (if (= (substr str pos n) old)
          (setq out (strcat out new) pos (+ pos n))
          (setq out (strcat out (substr str pos 1)) pos (1+ pos))))
      (strcat out (substr str pos)))))

;; Ask for one of the keywords in BITS ("Yes No"), default DEF; returns the keyword.
(defun cx:ask-kw (msg bits def / v)
  (initget 0 bits)
  (setq v (getkword (strcat "\n" msg " [" (cx:replace bits " " "/") "] <" def ">: ")))
  (if v v def))

;; Ask for a string (spaces allowed) with a default; "-" means an empty string.
(defun cx:ask-str (msg def / v)
  (setq v (getstring T (strcat "\n" msg " <" def ">: ")))
  (cond ((= v "") def) ((= v "-") "") (T v)))

;; Save the system variables in VARS ((name . value) ...), set them, and open one undo step.
;; The caller declares cx:sv as a local so the saved values live exactly as long as the command.
(defun cx:start (vars)
  (setq cx:sv (mapcar (function (lambda (v) (cons (car v) (getvar (car v))))) vars))
  (command "_.UNDO" "_Begin")
  (foreach v vars (setvar (car v) (cdr v)))
  (princ))

(princ "\nCXATTVIS loaded. Type CXATTVIS to start.")
(princ)

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