ox: Remove `comment' special value for `org-export-with-creator'

* lisp/ox.el (org-export-with-creator): Change default value.

* lisp/ox-ascii.el (org-ascii-template):
* lisp/ox-beamer.el (org-beamer-template):
* lisp/ox-latex.el (org-latex-template):
* lisp/ox-odt.el (org-odt-template):
* lisp/ox-org.el (org-org-template):
* lisp/ox-texinfo.el (org-texinfo-template): Treat
  `org-export-with-creator' as a boolean.

* testing/lisp/test-ox.el (test-org-export/parse-option-keyword):
  Update test.

* doc/org.texi (Export settings): Update allowed values in
  `org-export-with-creator'.

* etc/ORG-NEWS: Signal change.

Special `comment' value isn't meaningful for all back-ends and is not
implemented in every back-end where it makes sense anyway.

It is possible to add a comment including creator at the end of the
document using a body filter instead.

doc/org.texi

@@ -10775,8 +10775,8 @@ Toggle inclusion of CLOCK keywords (@code{org-export-with-clocks}).
 
 @item creator:
 @vindex org-export-with-creator
-Configure inclusion of creator info into exported file.  It may be set to
-@code{comment} (@code{org-export-with-creator}).
+Toggle inclusion of creator info into exported file
+(@code{org-export-with-creator}).
 
 @item d:
 @vindex org-export-with-drawers

etc/ORG-NEWS

@@ -96,6 +96,10 @@ compatibility.
 
 If you need to separate consecutive lists with blank lines, always use
 two of them, as if this option was nil (default value).
+*** ~org-export-with-creator~ is a boolean
+Special ~comment~ value is no longer allowed.  It is possible to use
+a body filter to add comments about the creator at the end of the
+document instead.
 *** Removed option =org-babel-sh-command=
 This undocumented option defaulted to the value of =shell-file-name=
 at the time of loading =ob-shell=.  The new behaviour is to use the

lisp/ox-ascii.el

@@ -1097,7 +1097,7 @@ CONTENTS is the transcoded contents string.  INFO is a plist
 holding export options."
   (let ((global-margin (plist-get info :ascii-global-margin)))
     (concat
-     ;; 1. Build title block.
+     ;; Build title block.
      (org-ascii--indent-string
       (concat (org-ascii-template--document-title info)
 	      ;; 2. Table of contents.
@@ -1107,19 +1107,18 @@ holding export options."
 		   (org-ascii--build-toc info (and (wholenump depth) depth))
 		   "\n\n\n"))))
       global-margin)
-     ;; 3. Document's body.
+     ;; Document's body.
      contents
-     ;; 4. Creator.  Ignore `comment' value as there are no comments in
-     ;;    ASCII.  Justify it to the bottom right.
-     (org-ascii--indent-string
-      (let ((creator-info (plist-get info :with-creator))
-	    (text-width (- (plist-get info :ascii-text-width) global-margin)))
-	(unless (or (not creator-info) (eq creator-info 'comment))
-	  (concat
-	   "\n\n\n"
-	   (org-ascii--fill-string
-	    (plist-get info :creator) text-width info 'right))))
-      global-margin))))
+     ;; Creator.  Justify it to the bottom right.
+     (and (plist-get info :with-creator)
+	  (org-ascii--indent-string
+	   (let ((text-width
+		  (- (plist-get info :ascii-text-width) global-margin)))
+	     (concat
+	      "\n\n\n"
+	      (org-ascii--fill-string
+	       (plist-get info :creator) text-width info 'right)))
+	   global-margin)))))
 
 (defun org-ascii--translate (s info)
   "Translate string S according to specified language and charset.

lisp/ox-beamer.el

@@ -899,12 +899,9 @@ holding export options."
      ;; 13. Document's body.
      contents
      ;; 14. Creator.
-     (let ((creator-info (plist-get info :with-creator)))
-       (cond
-	((not creator-info) "")
-	((eq creator-info 'comment)
-	 (format "%% %s\n" (plist-get info :creator)))
-	(t (concat (plist-get info :creator) "\n"))))
+     (if (plist-get info :with-creator)
+	 (concat (plist-get info :creator) "\n")
+       "")
      ;; 15. Document end.
      "\\end{document}")))
 

lisp/ox-latex.el

@@ -1325,12 +1325,8 @@ holding export options."
      ;; Document's body.
      contents
      ;; Creator.
-     (let ((creator-info (plist-get info :with-creator)))
-       (cond
-	((not creator-info) "")
-	((eq creator-info 'comment)
-	 (format "%% %s\n" (plist-get info :creator)))
-	(t (concat (plist-get info :creator) "\n"))))
+     (and (plist-get info :with-creator)
+	  (concat (plist-get info :creator) "\n"))
      ;; Document end.
      "\\end{document}")))
 

lisp/ox-odt.el

@@ -1360,7 +1360,8 @@ original parsed data.  INFO is a plist holding export options."
 		     iso-date)))))
       (format "<meta:generator>%s</meta:generator>\n"
 	      (if (plist-get info :with-creator)
-		  (plist-get info :creator) ""))
+		  (plist-get info :creator)
+		""))
       (format "<meta:keyword>%s</meta:keyword>\n" keywords)
       (format "<dc:subject>%s</dc:subject>\n" description)
       (format "<dc:title>%s</dc:title>\n" title)

lisp/ox-org.el

@@ -178,17 +178,14 @@ as a communication channel."
 	(let ((email (org-export-data (plist-get info :email) info)))
 	  (and (org-string-nw-p email)
 	       (format "#+EMAIL: %s\n" email))))
-   (and (eq (plist-get info :with-creator) t)
+   (and (plist-get info :with-creator)
 	(org-string-nw-p (plist-get info :creator))
 	(format "#+CREATOR: %s\n" (plist-get info :creator)))
    (and (org-string-nw-p (plist-get info :keywords))
 	(format "#+KEYWORDS: %s\n" (plist-get info :keywords)))
    (and (org-string-nw-p (plist-get info :description))
 	(format "#+DESCRIPTION: %s\n" (plist-get info :description)))
-   contents
-   (and (eq (plist-get info :with-creator) 'comment)
-	(org-string-nw-p (plist-get info :creator))
-	(format "\n# %s\n" (plist-get info :creator)))))
+   contents))
 
 (defun org-org-section (section contents info)
   "Transcode SECTION element back into Org syntax.

lisp/ox-texinfo.el

@@ -608,10 +608,8 @@ holding export options."
      ;; Document's body.
      contents "\n"
      ;; Creator.
-     (case (plist-get info :with-creator)
-       ((nil) nil)
-       (comment (format "@c %s\n" (plist-get info :creator)))
-       (otherwise (concat (plist-get info :creator) "\n")))
+     (and (plist-get info :with-creator)
+	  (concat (plist-get info :creator) "\n"))
      ;; Document end.
      "@bye")))
 

lisp/ox.el

@@ -370,18 +370,18 @@ e.g. \"c:t\"."
   :group 'org-export-general
   :type 'boolean)
 
-(defcustom org-export-with-creator 'comment
+(defcustom org-export-with-creator nil
   "Non-nil means the postamble should contain a creator sentence.
 
-The sentence can be set in `org-export-creator-string' and
-defaults to \"Generated by Org mode XX in Emacs XXX.\".
+The sentence can be set in `org-export-creator-string', which
+see.
 
-If the value is `comment' insert it as a comment."
+This option can also be set with the OPTIONS keyword, e.g.,
+\"creator:t\"."
   :group 'org-export-general
-  :type '(choice
-	  (const :tag "No creator sentence" nil)
-	  (const :tag "Sentence as a comment" comment)
-	  (const :tag "Insert the sentence" t)))
+  :version "25.1"
+  :package-version '(Org . "8.3")
+  :type 'boolean)
 
 (defcustom org-export-with-date t
   "Non-nil means insert date in the exported document.

testing/lisp/test-ox.el

@@ -124,13 +124,12 @@ variable, and communication channel under `info'."
   (should
    (equal
     (org-export--parse-option-keyword
-     "arch:headline creator:comment d:(\"TEST\")
- ^:{} toc:1 tags:not-in-toc tasks:todo num:2 <:active")
+     "arch:headline d:(\"TEST\") ^:{} toc:1 tags:not-in-toc tasks:todo num:2 <:active")
     '( :section-numbers
        2
-       :with-archived-trees headline :with-creator comment
-       :with-drawers ("TEST") :with-sub-superscript {} :with-toc 1
-       :with-tags not-in-toc :with-tasks todo :with-timestamps active))))
+       :with-archived-trees headline :with-drawers ("TEST")
+       :with-sub-superscript {} :with-toc 1 :with-tags not-in-toc
+       :with-tasks todo :with-timestamps active))))
 
 (ert-deftest test-org-export/get-inbuffer-options ()
   "Test reading all standard export keywords."