Do not export TODO's and unused sections to PDF

README.org

@@ -1346,7 +1346,7 @@ print(payload := f"org-protocol://store-link?{parameters}")
 execvp("emacsclient", ("-n", payload))
 #+end_src
 
-** TODO Look into: org-protocol handling with other browser on Darwin
+** TODO Org-protocol handling with other browser on Darwin         :noexport:
 :PROPERTIES:
 :CUSTOM_ID: sec:org-protocol-darwin
 :END:
@@ -1635,14 +1635,6 @@ completion function [[info:elisp#Minibuffer Completion][completing-read]].  List
   (keymap-global-set "M-y" #'consult-yank-pop))
 #+end_src
 
-*** TODO Explore ~org-goto~ versus ~consult-org-heading~
-:PROPERTIES:
-:CUSTOM_ID: sec:todo-org-goto
-:END:
-
-Explore in particular ~auto-isearch~ (looks powerfull) and ~org-occur~ (looks
-mysterious) in the ~org-goto~ user interface.
-
 ** [[https://company-mode.github.io/][Company (info)]]
 :PROPERTIES:
 :CUSTOM_ID: sec:company-setup
@@ -1658,15 +1650,15 @@ configures =company= after ensuring the =company= installation.
 (when (ensure-package-installation 'company)
   ;; https://github.com/purcell/emacs.d/issues/778
   (setopt company-transformers '(company-sort-by-occurrence))
-  (dolist (hook '(LaTeX-mode-hook
-                  org-mode-hook
-                  emacs-lisp-mode-hook
-                  lisp-interaction-mode-hook
-                  lisp-mode-hook
-                  python-mode-hook
-                  ielm-mode-hook
-                  sly-mrepl-mode-hook))
-    (add-hook hook #'company-mode)))
+  (dolist (symbol '(LaTeX-mode-hook
+                    org-mode-hook
+                    emacs-lisp-mode-hook
+                    lisp-interaction-mode-hook
+                    lisp-mode-hook
+                    python-mode-hook
+                    ielm-mode-hook
+                    sly-mrepl-mode-hook))
+    (add-hook symbol #'company-mode)))
 #+end_src
 
 * [[info:emacs#Search][Search and replace (info)]]
@@ -2182,13 +2174,6 @@ configuration objectives:
                                LaTeX-section-label)))
 #+end_src
 
-*** TODO Improve the AUCTeX configuration slowly
-:PROPERTIES:
-:CUSTOM_ID: sec:setup-auctex-slowly
-:END:
-
-[[https://github.com/thisirs/dotemacs/blob/master/lisp/init-auctex.el][AUCTeX setup of an experienced user]]
-
 ** Writing [[https://www.markdownguide.org/][Markdown]] files
 :PROPERTIES:
 :CUSTOM_ID: sec:writing-markdown-files
@@ -2243,22 +2228,23 @@ list detailing and motivating each listing:
    "org-lint")}.
 5. Listing [[lst:set-org-link-options]] handles [[https://orgmode.org/][Org-mode]] options specific to
    [[info:org#Hyperlinks][hyperlinks (info)]].
-6. Listing [[lst:setup-org-mode-map-1]] and [[lst:setup-org-mode-map-2]] extend the
+6. Listing [[lst:looking-at-org-id]] enables recent ~org-id~ features.
+7. Listing [[lst:setup-org-mode-map-1]] and [[lst:setup-org-mode-map-2]] extend the
  =org-mode-map= with useful key-bindings.
-7. Listing [[lst:setup-org-src]] facilitates [[info:org#Editing Source Code][editing source code blocks]], and it
+8. Listing [[lst:setup-org-src]] facilitates [[info:org#Editing Source Code][editing source code blocks]], and it
    provides functions to change the indentation of all =org-src-mode= blocks.
-8. Listing [[lst:setup-ob-python]] allows to pretty-print Python session source
+9. Listing [[lst:setup-ob-python]] allows to pretty-print Python session source
    block values with [[https://github.com/psf/black#readme][black]] instead of [[https://docs.python.org/3/library/pprint.html][pprint]].  This snippet may break in the
    future, because it sets =org-babel-python--def-format-value= which is a
    constant declared "private" by two dashes in its name!
-9. Listing [[lst:set-org-export-options]] selects the =non-intrusive= expert user
-   interface for export dispatching.
-10. Listing [[lst:setup-org-for-lualatex-export]] and
+10. Listing [[lst:set-org-export-options]] selects the =non-intrusive= expert user
+    interface for export dispatching.
+11. Listing [[lst:setup-org-for-lualatex-export]] and
     [[lst:set-ox-latex-options-for-lualatex-export]] configure [[https://orgmode.org/][Org-mode]] to generate
     output for the LuaLaTeX compiler.
-11. Listing [[lst:setup-org-latex-classes]] defines [[info:org#LaTeXspecificexportsettings][org-latex-classes (info)]] for
-    backward compatibility.  Type {{{kbd(C-h v org-latex-classes)}}} for an
-    explanation of the code in listing [[lst:setup-org-latex-classes]].
+12. Listing [[lst:setup-org-latex-classes]] defines [[info:org#LaTeXspecificexportsettings][org-latex-classes (info)]] for
+    backward compatibility.  For an explanation of the code in listing
+    [[lst:setup-org-latex-classes]], type {{{kbd(C-h v org-latex-classes)}}}.
 
 #+caption[Set basic =Org= options]:
 #+caption: Set basic =Org= options.
@@ -2382,6 +2368,22 @@ Watch out for completion `visit-tags-table' prompts."
           org-link-search-must-match-exact-headline nil))
 #+end_src
 
+#+caption[Looking at =org-id=]:
+#+caption: Looking at =org-id=.
+#+name: lst:looking-at-org-id
+#+begin_src emacs-lisp -n :results silent
+(with-eval-after-load 'org-id
+  (setopt org-id-link-to-org-use-id t
+          org-id-track-globally t)
+  ;; https://stackoverflow.com/a/16247032 answers
+  ;; "How to assign IDs to all entries in a buffer."
+  (defun org-id-add-ids-to-headlines-in-buffer ()
+    "Add slowly ID properties to all headlines without such an ID property.
+Undo this by means of `org-delete-property-globally'."
+    (interactive)
+    (org-map-entries #'org-id-get-create)))
+#+end_src
+
 #+caption[Setup =org-mode-map= 1]:
 #+caption: Setup =org-mode-map= 1.
 #+name: lst:setup-org-mode-map-1
@@ -6405,9 +6407,6 @@ configures =code-cells=.
       (keymap-set map "C-c C-c" #'code-cells-eval))))
 #+end_src
 
-*** TODO Look into: editing facilities
-1. [[https://github.com/douglasdavis/numpydoc.el/blob/main/numpydoc.el][Emacs extension to insert numpy style docstrings in function definitions]]
-
 * [[https://github.com/emacs-tw/awesome-emacs#library][Libraries]]
 :PROPERTIES:
 :CUSTOM_ID: sec:libraries
@@ -6970,9 +6969,10 @@ sets the =webjump-sites= option.
                                         "www.woorden.org/woord/" ""])))))
 #+end_src
 
-** [[info:gnus#Top][Reading News and Mail (info)]]
+** [[info:gnus#Top][Reading News and Mail (info)]]                                    :noexport:
 :PROPERTIES:
 :CUSTOM_ID: sec:reading-news-mail
+:header-args:emacs-lisp: :tangle no
 :END:
 
 Reading news and mail:
@@ -7020,9 +7020,10 @@ Password management:
   (setopt gnus-thread-hide-subtree t))
 #+end_src
 
-** [[info:emacs#Sending Mail][Sending Mail (info)]]
+** [[info:emacs#Sending Mail][Sending Mail (info)]]                                             :noexport:
 :PROPERTIES:
 :CUSTOM_ID: sec:sending-mail
+:header-args:emacs-lisp: :tangle no
 :END:
 
 1. [[https://macowners.club/posts/email-emacs-mu4e-macos/][Email setup in Emacs with Mu4e on macOS]]