Hello,

Carsten Dominik <drostekirs...@gmail.com> writes:

> So:  IF YOU HAVE CUSTOMIZED any of this variables, I'd like to hear about it.
> Otherwise, I now think that the proposal is actually good and should
> move ahead.

Here is the suggested patch.


Regards,

-- 
Nicolas Goaziou
>From b7bed5ebaf41498a70f8df18a4441d1a0732a737 Mon Sep 17 00:00:00 2001
From: Nicolas Goaziou <n.goaz...@gmail.com>
Date: Tue, 29 Oct 2013 14:53:21 +0100
Subject: [PATCH] Change some defcustoms into defconsts

* lisp/org.el (org-clock-string, org-closed-string)
  (org-deadline-string, org-scheduled-string)
  (org-archive-tag, org-comment-string, org-quote-string): Turn
  variables into constants.

Also collect all syntax related constants in the same part of the
file.
---
 lisp/org.el | 343 +++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 176 insertions(+), 167 deletions(-)

diff --git a/lisp/org.el b/lisp/org.el
index 4f3bf4b..06fceb4 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -314,8 +314,181 @@ When MESSAGE is non-nil, display a message with the version."
 
 (defconst org-version (org-version))
 
-;;; Compatibility constants
+
+;;; Syntax Constants
+
+;;;; Blocks
+
+(defconst org-block-regexp
+  "^[ \t]*#\\+begin_?\\([^ \n]+\\)\\(\\([^\n]+\\)\\)?\n\\([^\000]+?\\)#\\+end_?\\1[ \t]*$"
+  "Regular expression for hiding blocks.")
+
+(defconst org-dblock-start-re
+  "^[ \t]*#\\+\\(?:BEGIN\\|begin\\):[ \t]+\\(\\S-+\\)\\([ \t]+\\(.*\\)\\)?"
+  "Matches the start line of a dynamic block, with parameters.")
+
+(defconst org-dblock-end-re "^[ \t]*#\\+\\(?:END\\|end\\)\\([: \t\r\n]\\|$\\)"
+  "Matches the end of a dynamic block.")
+
+;;;; Clock and Planning
+
+(defconst org-clock-string "CLOCK:"
+  "String used as prefix for timestamps clocking work hours on an item.")
+
+(defconst org-closed-string "CLOSED:"
+  "String used as the prefix for timestamps logging closing a TODO entry.")
+
+(defconst org-deadline-string "DEADLINE:"
+  "String to mark deadline entries.
+A deadline is this string, followed by a time stamp.  Should be a word,
+terminated by a colon.  You can insert a schedule keyword and
+a timestamp with \\[org-deadline].")
+
+(defconst org-scheduled-string "SCHEDULED:"
+  "String to mark scheduled TODO entries.
+A schedule is this string, followed by a time stamp.  Should be a word,
+terminated by a colon.  You can insert a schedule keyword and
+a timestamp with \\[org-schedule].")
+
+(defconst org-planning-or-clock-line-re
+  (concat "^[ \t]*"
+	  (regexp-opt
+	   (list org-clock-string org-closed-string org-deadline-string
+		 org-scheduled-string)
+	   t))
+  "Matches a line with planning or clock info.
+Matched keyword is in group 1.")
+
+;;;; Drawer
+
+(defconst org-property-start-re "^[ \t]*:PROPERTIES:[ \t]*$"
+  "Regular expression matching the first line of a property drawer.")
+
+(defconst org-property-end-re "^[ \t]*:END:[ \t]*$"
+  "Regular expression matching the last line of a property drawer.")
+
+(defconst org-clock-drawer-start-re "^[ \t]*:CLOCK:[ \t]*$"
+  "Regular expression matching the first line of a property drawer.")
+
+(defconst org-clock-drawer-end-re "^[ \t]*:END:[ \t]*$"
+  "Regular expression matching the first line of a property drawer.")
+
+(defconst org-property-drawer-re
+  (concat "\\(" org-property-start-re "\\)[^\000]*?\\("
+	  org-property-end-re "\\)\n?")
+  "Matches an entire property drawer.")
+
+(defconst org-clock-drawer-re
+  (concat "\\(" org-clock-drawer-start-re "\\)[^\000]*?\\("
+	  org-property-end-re "\\)\n?")
+  "Matches an entire clock drawer.")
+
+;;;; Headline
+
+(defconst org-heading-keyword-regexp-format
+  "^\\(\\*+\\)\\(?: +%s\\)\\(?: +\\(.*?\\)\\)?[ \t]*$"
+  "Printf format for a regexp matching a headline with some keyword.
+This regexp will match the headline of any node which has the
+exact keyword that is put into the format.  The keyword isn't in
+any group by default, but the stars and the body are.")
+
+(defconst org-heading-keyword-maybe-regexp-format
+  "^\\(\\*+\\)\\(?: +%s\\)?\\(?: +\\(.*?\\)\\)?[ \t]*$"
+  "Printf format for a regexp matching a headline, possibly with some keyword.
+This regexp can match any headline with the specified keyword, or
+without a keyword.  The keyword isn't in any group by default,
+but the stars and the body are.")
+
+(defconst org-archive-tag "ARCHIVE"
+  "The tag that marks a subtree as archived.
+An archived subtree does not open during visibility cycling, and does
+not contribute to the agenda listings.")
+
+(defconst org-comment-string "COMMENT"
+  "Entries starting with this keyword will never be exported.
+An entry can be toggled between COMMENT and normal with
+\\[org-toggle-comment].")
+
+(defconst org-quote-string "QUOTE"
+  "Entries starting with this keyword will be exported in fixed-width font.
+Quoting applies only to the text in the entry following the headline, and does
+not extend beyond the next headline, even if that is lower level.
+An entry can be toggled between QUOTE and normal with
+\\[org-toggle-fixed-width-section].")
+
+;;;; Table
+
+(defconst org-table-any-line-regexp "^[ \t]*\\(|\\|\\+-[-+]\\)"
+  "Detect an org-type or table-type table.")
+
+(defconst org-table-line-regexp "^[ \t]*|"
+  "Detect an org-type table line.")
+
+(defconst org-table-dataline-regexp "^[ \t]*|[^-]"
+  "Detect an org-type table line.")
+
+(defconst org-table-hline-regexp "^[ \t]*|-"
+  "Detect an org-type table hline.")
+
+(defconst org-table1-hline-regexp "^[ \t]*\\+-[-+]"
+  "Detect a table-type table hline.")
+
+(defconst org-table-any-border-regexp "^[ \t]*[^|+ \t]"
+  "Detect the first line outside a table when searching from within it.
+This works for both table types.")
+
+(defconst org-TBLFM-regexp "^[ \t]*#\\+TBLFM: "
+  "Detect a #+TBLFM line.")
+
+;;;; Timestamp
+
+(defconst org-ts-regexp "<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^\r\n>]*?\\)>"
+  "Regular expression for fast time stamp matching.")
+
+(defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?\\)[]>]"
+  "Regular expression for fast time stamp matching.")
+
+(defconst org-ts-regexp0
+  "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\)\\( +[^]+0-9>\r\n -]+\\)?\\( +\\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+  "Regular expression matching time strings for analysis.
+This one does not require the space after the date, so it can be used
+on a string that terminates immediately after the date.")
+
+(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+  "Regular expression matching time strings for analysis.")
+
+(defconst org-ts-regexp2 (concat "<" org-ts-regexp1 "[^>\n]\\{0,16\\}>")
+  "Regular expression matching time stamps, with groups.")
+
+(defconst org-ts-regexp3 (concat "[[<]" org-ts-regexp1 "[^]>\n]\\{0,16\\}[]>]")
+  "Regular expression matching time stamps (also [..]), with groups.")
+
+(defconst org-tr-regexp (concat org-ts-regexp "--?-?" org-ts-regexp)
+  "Regular expression matching a time stamp range.")
+
+(defconst org-tr-regexp-both
+  (concat org-ts-regexp-both "--?-?" org-ts-regexp-both)
+  "Regular expression matching a time stamp range.")
+
+(defconst org-tsr-regexp (concat org-ts-regexp "\\(--?-?"
+				 org-ts-regexp "\\)?")
+  "Regular expression matching a time stamp or time stamp range.")
+
+(defconst org-tsr-regexp-both
+  (concat org-ts-regexp-both "\\(--?-?"
+	  org-ts-regexp-both "\\)?")
+  "Regular expression matching a time stamp or time stamp range.
+The time stamps may be either active or inactive.")
+
+(defconst org-repeat-re
+  "<[0-9]\\{4\\}-[0-9][0-9]-[0-9][0-9] [^>\n]*?\\([.+]?\\+[0-9]+[hdwmy]\\(/[0-9]+[hdwmy]\\)?\\)"
+  "Regular expression for specifying repeated events.
+After a match, group 1 contains the repeat expression.")
+
+(defconst org-time-stamp-formats '("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")
+  "Formats for `format-time-string' which are used for time stamps.")
 
+
 ;;; The custom variables
 
 (defgroup org nil
@@ -824,34 +997,6 @@ effective."
   :tag "Org Keywords"
   :group 'org)
 
-(defcustom org-deadline-string "DEADLINE:"
-  "String to mark deadline entries.
-A deadline is this string, followed by a time stamp.  Should be a word,
-terminated by a colon.  You can insert a schedule keyword and
-a timestamp with \\[org-deadline].
-Changes become only effective after restarting Emacs."
-  :group 'org-keywords
-  :type 'string)
-
-(defcustom org-scheduled-string "SCHEDULED:"
-  "String to mark scheduled TODO entries.
-A schedule is this string, followed by a time stamp.  Should be a word,
-terminated by a colon.  You can insert a schedule keyword and
-a timestamp with \\[org-schedule].
-Changes become only effective after restarting Emacs."
-  :group 'org-keywords
-  :type 'string)
-
-(defcustom org-closed-string "CLOSED:"
-  "String used as the prefix for timestamps logging closing a TODO entry."
-  :group 'org-keywords
-  :type 'string)
-
-(defcustom org-clock-string "CLOCK:"
-  "String used as prefix for timestamps clocking work hours on an item."
-  :group 'org-keywords
-  :type 'string)
-
 (defcustom org-closed-keep-when-no-todo nil
   "Remove CLOSED: time-stamp when switching back to a non-todo state?"
   :group 'org-todo
@@ -860,35 +1005,6 @@ Changes become only effective after restarting Emacs."
   :package-version '(Org . "8.0")
   :type 'boolean)
 
-(defconst org-planning-or-clock-line-re (concat "^[ \t]*\\("
-						org-scheduled-string "\\|"
-						org-deadline-string "\\|"
-						org-closed-string "\\|"
-						org-clock-string "\\)")
-  "Matches a line with planning or clock info.")
-
-(defcustom org-comment-string "COMMENT"
-  "Entries starting with this keyword will never be exported.
-An entry can be toggled between COMMENT and normal with
-\\[org-toggle-comment].
-Changes become only effective after restarting Emacs."
-  :group 'org-keywords
-  :type 'string)
-
-(defcustom org-quote-string "QUOTE"
-  "Entries starting with this keyword will be exported in fixed-width font.
-Quoting applies only to the text in the entry following the headline, and does
-not extend beyond the next headline, even if that is lower level.
-An entry can be toggled between QUOTE and normal with
-\\[org-toggle-fixed-width-section]."
-  :group 'org-keywords
-  :type 'string)
-
-(defconst org-repeat-re
-  "<[0-9]\\{4\\}-[0-9][0-9]-[0-9][0-9] [^>\n]*?\\([.+]?\\+[0-9]+[hdwmy]\\(/[0-9]+[hdwmy]\\)?\\)"
-  "Regular expression for specifying repeated events.
-After a match, group 1 contains the repeat expression.")
-
 (defgroup org-structure nil
   "Options concerning the general structure of Org-mode files."
   :tag "Org Structure"
@@ -2851,10 +2967,6 @@ the time stamp will always be forced into the second line."
   :group 'org-time
   :type 'boolean)
 
-(defconst org-time-stamp-formats '("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")
-  "Formats for `format-time-string' which are used for time stamps.
-It is not recommended to change this constant.")
-
 (defcustom org-time-stamp-rounding-minutes '(0 5)
   "Number of minutes to round time stamps to.
 These are two values, the first applies when first creating a time stamp.
@@ -4228,32 +4340,13 @@ Normal means, no org-mode-specific context."
 
 ;;; Autoload and prepare some org modules
 
-;; Some table stuff that needs to be defined here, because it is used
-;; by the functions setting up org-mode or checking for table context.
-
-(defconst org-table-any-line-regexp "^[ \t]*\\(|\\|\\+-[-+]\\)"
-  "Detect an org-type or table-type table.")
-(defconst org-table-line-regexp "^[ \t]*|"
-  "Detect an org-type table line.")
-(defconst org-table-dataline-regexp "^[ \t]*|[^-]"
-  "Detect an org-type table line.")
-(defconst org-table-hline-regexp "^[ \t]*|-"
-  "Detect an org-type table hline.")
-(defconst org-table1-hline-regexp "^[ \t]*\\+-[-+]"
-  "Detect a table-type table hline.")
-(defconst org-table-any-border-regexp "^[ \t]*[^|+ \t]"
-  "Detect the first line outside a table when searching from within it.
-This works for both table types.")
-
-;; Autoload the functions in org-table.el that are needed by functions here.
+;;;; Autoload the functions in org-table.el that are needed by
+;;;; functions here.
 
 (eval-and-compile
   (org-autoload "org-table"
 		'(org-table-begin org-table-blank-field org-table-end)))
 
-(defconst org-TBLFM-regexp "^[ \t]*#\\+TBLFM: "
-  "Detect a #+TBLFM line.")
-
 ;;;###autoload
 (defun turn-on-orgtbl ()
   "Unconditionally turn on `orgtbl-mode'."
@@ -4461,16 +4554,6 @@ the hierarchy, it will be used."
   :group 'org-archive
   :type 'string)
 
-(defcustom org-archive-tag "ARCHIVE"
-  "The tag that marks a subtree as archived.
-An archived subtree does not open during visibility cycling, and does
-not contribute to the agenda listings.
-After changing this, font-lock must be restarted in the relevant buffers to
-get the proper fontification."
-  :group 'org-archive
-  :group 'org-keywords
-  :type 'string)
-
 (defcustom org-agenda-skip-archived-trees t
   "Non-nil means the agenda will skip any items located in archived trees.
 An archived tree is a tree marked with the tag ARCHIVE.  The use of this
@@ -4784,22 +4867,6 @@ means to push this value onto the list in the variable.")
 	(cons (cons key (if previous (concat previous " " val) val)) remainder)
       (cons (cons key val) remainder))))
 
-(defconst org-block-regexp
-  "^[ \t]*#\\+begin_?\\([^ \n]+\\)\\(\\([^\n]+\\)\\)?\n\\([^\000]+?\\)#\\+end_?\\1[ \t]*$"
-  "Regular expression for hiding blocks.")
-(defconst org-heading-keyword-regexp-format
-  "^\\(\\*+\\)\\(?: +%s\\)\\(?: +\\(.*?\\)\\)?[ \t]*$"
-  "Printf format for a regexp matching a headline with some keyword.
-This regexp will match the headline of any node which has the
-exact keyword that is put into the format.  The keyword isn't in
-any group by default, but the stars and the body are.")
-(defconst org-heading-keyword-maybe-regexp-format
-  "^\\(\\*+\\)\\(?: +%s\\)?\\(?: +\\(.*?\\)\\)?[ \t]*$"
-  "Printf format for a regexp matching a headline, possibly with some keyword.
-This regexp can match any headline with the specified keyword, or
-without a keyword.  The keyword isn't in any group by default,
-but the stars and the body are.")
-
 (defcustom org-group-tags t
   "When non-nil (the default), use group tags.
 This can be turned on/off through `org-toggle-tags-groups'."
@@ -5662,35 +5729,6 @@ This should be called after the variable `org-link-types' has changed."
 
 (org-make-link-regexps)
 
-(defconst org-ts-regexp "<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^\r\n>]*?\\)>"
-  "Regular expression for fast time stamp matching.")
-(defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?\\)[]>]"
-  "Regular expression for fast time stamp matching.")
-(defconst org-ts-regexp0
-  "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\)\\( +[^]+0-9>\r\n -]+\\)?\\( +\\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
-  "Regular expression matching time strings for analysis.
-This one does not require the space after the date, so it can be used
-on a string that terminates immediately after the date.")
-(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
-  "Regular expression matching time strings for analysis.")
-(defconst org-ts-regexp2 (concat "<" org-ts-regexp1 "[^>\n]\\{0,16\\}>")
-  "Regular expression matching time stamps, with groups.")
-(defconst org-ts-regexp3 (concat "[[<]" org-ts-regexp1 "[^]>\n]\\{0,16\\}[]>]")
-  "Regular expression matching time stamps (also [..]), with groups.")
-(defconst org-tr-regexp (concat org-ts-regexp "--?-?" org-ts-regexp)
-  "Regular expression matching a time stamp range.")
-(defconst org-tr-regexp-both
-  (concat org-ts-regexp-both "--?-?" org-ts-regexp-both)
-  "Regular expression matching a time stamp range.")
-(defconst org-tsr-regexp (concat org-ts-regexp "\\(--?-?"
-				 org-ts-regexp "\\)?")
-  "Regular expression matching a time stamp or time stamp range.")
-(defconst org-tsr-regexp-both
-  (concat org-ts-regexp-both "\\(--?-?"
-	  org-ts-regexp-both "\\)?")
-  "Regular expression matching a time stamp or time stamp range.
-The time stamps may be either active or inactive.")
-
 (defvar org-emph-face nil)
 
 (defun org-do-emphasis-faces (limit)
@@ -11834,13 +11872,6 @@ If not found, stay at current position and return nil."
     (if pos (goto-char pos))
     pos))
 
-(defconst org-dblock-start-re
-  "^[ \t]*#\\+\\(?:BEGIN\\|begin\\):[ \t]+\\(\\S-+\\)\\([ \t]+\\(.*\\)\\)?"
-  "Matches the start line of a dynamic block, with parameters.")
-
-(defconst org-dblock-end-re "^[ \t]*#\\+\\(?:END\\|end\\)\\([: \t\r\n]\\|$\\)"
-  "Matches the end of a dynamic block.")
-
 (defun org-create-dblock (plist)
   "Create a dynamic block section, with parameters taken from PLIST.
 PLIST must contain a :name entry which is used as name of the block."
@@ -15036,28 +15067,6 @@ but in some other way.")
   "Some properties that are used by Org-mode for various purposes.
 Being in this list makes sure that they are offered for completion.")
 
-(defconst org-property-start-re "^[ \t]*:PROPERTIES:[ \t]*$"
-  "Regular expression matching the first line of a property drawer.")
-
-(defconst org-property-end-re "^[ \t]*:END:[ \t]*$"
-  "Regular expression matching the last line of a property drawer.")
-
-(defconst org-clock-drawer-start-re "^[ \t]*:CLOCK:[ \t]*$"
-  "Regular expression matching the first line of a property drawer.")
-
-(defconst org-clock-drawer-end-re "^[ \t]*:END:[ \t]*$"
-  "Regular expression matching the first line of a property drawer.")
-
-(defconst org-property-drawer-re
-  (concat "\\(" org-property-start-re "\\)[^\000]*?\\("
-	  org-property-end-re "\\)\n?")
-  "Matches an entire property drawer.")
-
-(defconst org-clock-drawer-re
-  (concat "\\(" org-clock-drawer-start-re "\\)[^\000]*?\\("
-	  org-property-end-re "\\)\n?")
-  "Matches an entire clock drawer.")
-
 (defun org-property-action ()
   "Do an action on properties."
   (interactive)
-- 
1.8.4.2

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