Break multiline text into single lines

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;;; ============================================================================
;;; CXM2T - Break MTEXT into single-line texts
;;; Version 1.0.0
;;; CADXChange LISP tools - https://cadxchange.net/resources/lisp/cxm2t
;;; 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
;;; ============================================================================

;; Break the MTEXT MT into one single-line TEXT per line, at the position each line has now.
;; DELETE = T erases the MTEXT. Returns the list of new TEXT entities.
(defun cx:m2t-run (mt delete / ed str lines n h pitch att rot top row col y local out e x just ang)
  (setq ed    (entget mt)
        str   (cx:text-plain (cx:text-get mt) T T)
        lines (cx:split-str str "\\P")
        n     (length lines)
        h     (cx:dxf 40 ed)
        pitch (* h 1.6667 (if (cx:dxf 44 ed) (cx:dxf 44 ed) 1.0))
        att   (if (cx:dxf 71 ed) (cx:dxf 71 ed) 1)
        row   (/ (1- att) 3)
        col   (rem (1- att) 3)
        ang   (cond ((cx:dxf 11 ed) (atan (cadr (cx:dxf 11 ed)) (car (cx:dxf 11 ed))))
                    ((cx:dxf 50 ed) (cx:dxf 50 ed))
                    (T 0.0))
        top   (+ (cadr (cx:dxf 10 ed)) (* (nth row (list 0.0 1.0 2.0)) 0.5 (+ (* (1- n) pitch) h)))
        out   nil)
  (setq just (nth col '(0 1 2)))
  (foreach l lines
    (setq y (- top h (* (length out) pitch))
          local (- y (cadr (cx:dxf 10 ed)))
          x (- (car (cx:dxf 10 ed)) (* local (sin ang)))
          y (+ (cadr (cx:dxf 10 ed)) (* local (cos ang))))
    (setq e
      (entmakex
        (append
          (list '(0 . "TEXT") (cons 8 (cx:dxf 8 ed)))
          (if (cx:dxf 62 ed) (list (cons 62 (cx:dxf 62 ed))))
          (list (list 10 x y (caddr (cx:dxf 10 ed))) (cons 40 h) (cons 1 l) (cons 50 ang) (cons 7 (if (cx:dxf 7 ed) (cx:dxf 7 ed) "STANDARD"))
                (cons 72 just))
          (if (> just 0) (list (list 11 x y (caddr (cx:dxf 10 ed)))))
          (list '(100 . "AcDbText") '(73 . 0)))))
    (if e (setq out (cons e out))))
  (if (and delete out) (entdel mt))
  (reverse out))

(defun c:CXM2T ( / *error* cx:sv ss del n)
  (setq *error* cx:err)
  (if (setq ss (cx:pick "\nSelect the MTEXT to break into lines: " '((0 . "MTEXT"))))
    (progn
      (setq del (= (cx:ask-kw "Erase the original MTEXT" "Yes No" "Yes") "Yes") n 0)
      (cx:start '(("CMDECHO" . 0)))
      (foreach e (cx:ss->list ss) (setq n (+ n (length (cx:m2t-run e del)))))
      (princ (strcat "\n" (itoa n) " line(s) created."))
      (cx:end)))
  (princ))


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

;; Split a TEXT (MT = nil) or MTEXT (MT = T) string into ((T . "plain") (C . "format code") ...).
;; Codes are %%c-style symbols, and in MTEXT also \P, \f...; \H...; \S...; {, } and the like.
(defun cx:fmt-tokens (str mt / out plain i n c d j k)
  (setq out nil plain "" i 1 n (strlen str))
  (while (<= i n)
    (setq c (substr str i 1) k 0)
    (cond
      ((and (= c "%") (= (substr str (1+ i) 1) "%") (< (1+ i) n))
       (setq k (if (wcmatch (substr str (+ i 2) 1) "#") 5 3)))
      ((and mt (= c "\\"))
       (setq d (substr str (1+ i) 1))
       (cond
         ((= d "") (setq k 1))
         ((member d '("P" "X" "x" "L" "l" "O" "o" "K" "k" "~" "\\" "{" "}")) (setq k 2))
         ((member d '("U" "u")) (setq k 7))
         (T
          (setq j i)
          (while (and (<= j n) (/= (substr str j 1) ";")) (setq j (1+ j)))
          (setq k (if (<= j n) (1+ (- j i)) 2)))))
      ((and mt (or (= c "{") (= c "}"))) (setq k 1)))
    (if (> k 0)
      (progn
        (if (/= plain "") (setq out (cons (cons 'T plain) out) plain ""))
        (setq out (cons (cons 'C (substr str i k)) out) i (+ i k)))
      (setq plain (strcat plain c) i (1+ i))))
  (if (/= plain "") (setq out (cons (cons 'T plain) out)))
  (reverse out))

;; The visible text of a TEXT or MTEXT string. In MTEXT, \P becomes a line break (KEEPNL = T: the two characters \P are kept).
(defun cx:text-plain (str mt keepnl / out)
  (setq out "")
  (foreach tk (cx:fmt-tokens str mt)
    (cond
      ((= (car tk) 'T) (setq out (strcat out (cdr tk))))
      ((= (cdr tk) "\\P") (setq out (strcat out (if keepnl "\\P" "\n"))))
      ((= (cdr tk) "\\~") (setq out (strcat out " ")))
      ((member (cdr tk) '("\\\\" "\\{" "\\}")) (setq out (strcat out (substr (cdr tk) 2))))))
  out)

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

;; The text of a TEXT, ATTRIB, ATTDEF or MTEXT (MTEXT keeps its codes).
(defun cx:text-get (ename / ed s)
  (setq ed (entget ename))
  (if (= (cx:dxf 0 ed) "MTEXT")
    (progn
      (setq s "")
      (foreach p ed (if (= (car p) 3) (setq s (strcat s (cdr p)))))
      (strcat s (cx:dxf 1 ed)))
    (cx:dxf 1 ed)))

;; 1-based position of SUB in STR at or after START, or nil.
(defun cx:find (str sub start / n i r)
  (setq n (strlen sub) i start r nil)
  (if (> n 0)
    (while (and (not r) (<= i (1+ (- (strlen str) n))))
      (if (= (substr str i n) sub) (setq r i))
      (setq i (1+ i))))
  r)

;; Split STR at every occurrence of the string DELIM.
(defun cx:split-str (str delim / out pos p)
  (setq out nil pos 1)
  (while (setq p (cx:find str delim pos))
    (setq out (cons (substr str pos (- p pos)) out) pos (+ p (strlen delim))))
  (reverse (cons (substr str pos) out)))

;; 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)

;; 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))

;; 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))

;; 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))

(princ "\nCXM2T loaded. Type CXM2T to start.")
(princ)

More commands: Text

• CXNUMNumber texts in sequence
• CXTXTADDAdd a prefix or suffix to many texts
• CXTXTCUTCut characters off the ends of texts
• CXTXTCASEChange the case of many texts
• CXTXTREPLFind and replace in many texts at once
• CXTXTCLEANClean up spaces and formatting in texts
• CXT2MMerge single-line texts into one multiline text
• CXTXTALIGNLine texts up with a reference text
• CXTXTSTYLEChange text style and height for many texts
• CXTXTCOUNTCount identical texts
• CXTXTSUMAdd up the numbers in texts