Allow per-buffer setting of org-link-descriptive via #+STARTUP options

* lisp/org.el (org-startup-options): Add new startup options to set
`org-link-descriptive'.
(org-mode): Move #+startup keyword parsing before setting up link
visibility.
* doc/org-manual.org (Link Format):
(Summary of In-Buffer Settings): Document the new startup option.
* etc/ORG-NEWS (~org-link-descriptive~ can now be set per-buffer via
=#+STARTUP= options): Announce the new feature.

Link: https://orgmode.org/list/87bkst1nfl.fsf@ucl.ac.uk

doc/org-manual.org

@@ -3172,7 +3172,8 @@ precise behavior depends on how point arrived there---see
 incomplete and the internals are again displayed as plain text.
 Inserting the missing bracket hides the link internals again.  To show
 the internal structure of all links, use the menu: Org \rarr
-Hyperlinks \rarr Literal links.
+Hyperlinks \rarr Literal links, customize ~org-link-descriptive~, or use
+=literallinks= [[*Summary of In-Buffer Settings][startup option]].
 
 ** Internal Links
 :PROPERTIES:
@@ -20272,6 +20273,17 @@ changes.
   | =inlineimages=   | Show inline images.                   |
   | =noinlineimages= | Do not show inline images on startup. |
 
+  #+vindex: org-link-descriptive
+  Bracket links in Org buffers are displayed hiding the link path and
+  brackets.  For example, =[[https://orgmode.org][Org Website]]= is,
+  by default, displayed as "Org Website", hiding the link itself and
+  just displaying its description.  Alternatively, the links can be
+  displayed in full.  The corresponding variable is
+ ~org-link-descriptive~.
+
+  | =descriptivelinks= | Hide path and brackets in links. |
+  | =literallinks=     | Do not hide anything.            |
+
   #+vindex: org-log-done
   #+vindex: org-log-note-clock-out
   #+vindex: org-log-repeat

etc/ORG-NEWS

@@ -371,6 +371,14 @@ The change is breaking when ~org-use-property-inheritance~ is set to ~t~.
 
 The =TEST= parameter is better served by Emacs debugging tools.
 ** New and changed options
+*** ~org-link-descriptive~ can now be set per-buffer via =#+STARTUP= options
+
+In addition to ~org-link-descriptive~ custom option, link display can
+now be controlled per-buffer as:
+
+: #+STARTUP: literallinks
+: #+STARTUP: descriptivelinks
+
 *** New option ~org-fast-tag-selection-maximum-tags~
 
 You can now limit the total number of tags displayed in the fast tag

lisp/org.el

@@ -4080,6 +4080,8 @@ After a match, the following groups carry important information:
     ("align" org-startup-align-all-tables t)
     ("noalign" org-startup-align-all-tables nil)
     ("shrink" org-startup-shrink-all-tables t)
+    ("descriptivelinks" org-link-descriptive t)
+    ("literallinks" org-link-descriptive nil)
     ("inlineimages" org-startup-with-inline-images t)
     ("noinlineimages" org-startup-with-inline-images nil)
     ("latexpreview" org-startup-with-latex-preview t)
@@ -4866,6 +4868,17 @@ The following commands are available:
   (org-load-modules-maybe)
   (when org-agenda-file-menu-enabled
     (org-install-agenda-files-menu))
+  (setq-local outline-regexp org-outline-regexp)
+  (setq-local outline-level 'org-outline-level)
+  ;; Initialize cache.
+  (org-element-cache-reset)
+  (when (and org-element-cache-persistent
+             org-element-use-cache)
+    (org-persist-load
+     `((elisp org-element--cache) (version ,org-element-cache-version))
+     (current-buffer)
+     'match-hash :read-related t))
+  (org-set-regexps-and-options)
   (when (and org-link-descriptive
              (eq org-fold-core-style 'overlays))
     (add-to-invisibility-spec '(org-link)))
@@ -4876,8 +4889,6 @@ The following commands are available:
   (if org-link-descriptive
       (org-fold-core-set-folding-spec-property (car org-link--link-folding-spec) :visible nil)
     (org-fold-core-set-folding-spec-property (car org-link--link-folding-spec) :visible t))
-  (setq-local outline-regexp org-outline-regexp)
-  (setq-local outline-level 'org-outline-level)
   (when (and (stringp org-ellipsis) (not (equal "" org-ellipsis)))
     (unless org-display-table
       (setq org-display-table (make-display-table)))
@@ -4886,15 +4897,6 @@ The following commands are available:
      (vconcat (mapcar (lambda (c) (make-glyph-code c 'org-ellipsis))
 		      org-ellipsis)))
     (setq buffer-display-table org-display-table))
-  ;; Initialize cache.
-  (org-element-cache-reset)
-  (when (and org-element-cache-persistent
-             org-element-use-cache)
-    (org-persist-load
-     `((elisp org-element--cache) (version ,org-element-cache-version))
-     (current-buffer)
-     'match-hash :read-related t))
-  (org-set-regexps-and-options)
   (org-set-font-lock-defaults)
   (when (and org-tag-faces (not org-tags-special-faces-re))
     ;; tag faces set outside customize.... force initialization.