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Re: [O] links-9.0 v3


From: John Kitchin
Subject: Re: [O] links-9.0 v3
Date: Wed, 06 Jul 2016 21:55:32 -0400
User-agent: mu4e 0.9.16; emacs 25.1.50.1

I think I have addressed these. Revised commits appended and at 
https://github.com/jkitchin/org-mode/tree/link-9.0-v3.

The new org-link-set-parameters function you suggested works fine as far
as I can tell. WDYT?

commit f8bb180150514b92535506601c747001da305610
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:38:42 2016 -0400

    Update the contrib manual

diff --git a/contrib/orgmanual.org b/contrib/orgmanual.org
index e48ae97..07d9e8d 100644
--- a/contrib/orgmanual.org
+++ b/contrib/orgmanual.org
@@ -3300,12 +3300,16 @@ can define them in the file with
   ,#+LINK: google    http://www.google.com/search?q=%s
 #+end_src
 
-{{{noindent}}} In-buffer completion (see [[Completion]]) can be used after
-{{{samp([)}}} to complete link abbreviations.  You may also define a
-function ~org-PREFIX-complete-link~ that implements special (e.g.,
-completion) support for inserting such a link with {{{kbd(C-c C-l)}}}.
-Such a function should not accept any arguments, and return the full
-link with prefix.
+{{{noindent}}} In-buffer completion (see [[Completion]]) can be used
+after {{{samp([)}}} to complete link abbreviations.  You may also
+define a function that implements special (e.g., completion) support
+for inserting such a link with {{{kbd(C-c C-l)}}}.  Such a function
+should not accept any arguments, and return the full link with
+prefix.  You can set the link completion function like this:
+
+#+BEGIN_SRC emacs-lisp
+(org-link-set-parameter "type" :complete #'some-completion-function)
+#+END_SRC
 
 ** Search options
    :PROPERTIES:
@@ -16998,10 +17002,9 @@ description when the link is later inserted into an 
Org buffer with
 {{{kbd(C-c C-l)}}}.
 
 When it makes sense for your new link type, you may also define a
-function ~org-PREFIX-complete-link~ that implements special (e.g.,
-completion) support for inserting such a link with {{{kbd(C-c C-l)}}}.
-Such a function should not accept any arguments, and return the full
-link with prefix.
+function that implements special (e.g., completion) support for
+inserting such a link with {{{kbd(C-c C-l)}}}.  Such a function should
+not accept any arguments, and return the full link with prefix.
 
 ** Context-sensitive commands
    :PROPERTIES:
@@ -19181,8 +19184,8 @@ from the list of stored links.  To keep it in the list 
later use, use a
 triple {{{kbd(C-u)}}} prefix argument to {{{kbd(C-c C-l)}}}, or
 configure the option ~org-keep-stored-link-after-insertion~.
 
-[fn:37] This works by calling a special function
-~org-PREFIX-complete-link~.
+[fn:37] This works if a function has been defined in the :complete
+property of a link in ~org-link-parameters~.
 
 [fn:38] See the variable ~org-display-internal-link-with-indirect-buffer~.
 

commit d5db3a80b3e6eab98935a329d8633a85f398ee3a
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:31:30 2016 -0400

    Update NEWS with link announcement

diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 9909910..6ff7442 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -353,6 +353,8 @@ first footnote.
 *** The ~org-block~ face is inherited by ~src-blocks~
 This works also when =org-src-fontify-natively= is non-nil.  It is also
 possible to specify per-languages faces.  See the manual for details.
+*** Links are now customizable
+Links can now have custom colors, tooltips, keymaps, display behavior, etc... 
Links are now centralized in ~org-link-parameters~.
 ** New functions
 *** ~org-next-line-empty-p~
 It replaces the deprecated ~next~ argument to ~org-previous-line-empty-p~.

commit 74d6817ea942b9b20b9a15f47d259ef71ddb83a3
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:29:07 2016 -0400

    Update the texinfo for link parameters documentation

diff --git a/doc/org.texi b/doc/org.texi
index e92788f..f962a58 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -3711,11 +3711,11 @@ them with @key{up} and @key{down} (or @kbd{M-p/n}).
 valid link prefixes like @samp{http:} or @samp{ftp:}, including the prefixes
 defined through link abbreviations (@pxref{Link abbreviations}).  If you
 press @key{RET} after inserting only the @var{prefix}, Org will offer
-specific completion support for some link address@hidden works by
-calling a special function @code{org-PREFIX-complete-link}.}  For
-example, if you type @kbd{file @key{RET}}, file name completion (alternative
-access: @kbd{C-u C-c C-l}, see below) will be offered, and after @kbd{bbdb
address@hidden you can complete contact names.
+specific completion support for some link address@hidden works if a
+completion function is defined in the :complete property of a link in
address@hidden  For example, if you type @kbd{file @key{RET}},
+file name completion (alternative access: @kbd{C-u C-c C-l}, see below) will
+be offered, and after @kbd{bbdb @key{RET}} you can complete contact names.
 @orgkey C-u C-c C-l
 @cindex file name completion
 @cindex completion, of file names
@@ -3887,10 +3887,13 @@ can define them in the file with
 
 @noindent
 In-buffer completion (@pxref{Completion}) can be used after @samp{[} to
-complete link abbreviations.  You may also define a function
address@hidden that implements special (e.g., completion)
-support for inserting such a link with @kbd{C-c C-l}.  Such a function should
-not accept any arguments, and return the full link with prefix.
+complete link abbreviations.  You may also define a function that implements
+special (e.g., completion) support for inserting such a link with @kbd{C-c
+C-l}.  Such a function should not accept any arguments, and return the full
+link with prefix.  You can add a completion function to a link like this:
+
address@hidden(org-link-set-parameters ``type'' :complete #'some-function)}
+
 
 @node Search options
 @section Search options in file links
@@ -18005,9 +18008,9 @@ the link description when the link is later inserted 
into an Org
 buffer with @kbd{C-c C-l}.
 
 When it makes sense for your new link type, you may also define a function
address@hidden that implements special (e.g., completion)
-support for inserting such a link with @kbd{C-c C-l}.  Such a function should
-not accept any arguments, and return the full link with prefix.
+that implements special (e.g., completion) support for inserting such a link
+with @kbd{C-c C-l}.  Such a function should not accept any arguments, and
+return the full link with prefix.
 
 @node Adding export back-ends
 @section Adding export back-ends

commit c8301849750a3f6590fe3f7bc9ddf79e835b9d1c
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 16:11:08 2016 -0400

    Update the "id" link with org-link-set-parameters
    
    * lisp/org-id.el:

diff --git a/lisp/org-id.el b/lisp/org-id.el
index 2646c80..5ad7f00 100644
--- a/lisp/org-id.el
+++ b/lisp/org-id.el
@@ -675,7 +675,7 @@ optional argument MARKERP, return the position as a new 
marker."
     (move-marker m nil)
     (org-show-context)))
 
-(org-add-link-type "id" 'org-id-open)
+(org-link-set-parameters "id" :follow #'org-id-open)
 
 (provide 'org-id)
 

commit ee4a5b043b0fedcdb1c47fdd2c4b20ccab499faf
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:28:38 2016 -0400

    Update w3m link definition
    
    * lisp/org-w3m.el ("w3m"):
    Update to use org-link-set-parameters.

diff --git a/lisp/org-w3m.el b/lisp/org-w3m.el
index 57ecafe..28bc492 100644
--- a/lisp/org-w3m.el
+++ b/lisp/org-w3m.el
@@ -46,7 +46,7 @@
 (defvar w3m-current-url)
 (defvar w3m-current-title)
 
-(add-hook 'org-store-link-functions 'org-w3m-store-link)
+(org-link-set-parameters "w3m" :store #'org-w3m-store-link)
 (defun org-w3m-store-link ()
   "Store a link to a w3m buffer."
   (when (eq major-mode 'w3m-mode)

commit f5af65a2cd9fe352014e4badf20bee89b79882e8
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:28:09 2016 -0400

    Update rmail link definition
    
    * lisp/org-rmail.el ("rmail"):
    Use org-link-set-parameters to define link.

diff --git a/lisp/org-rmail.el b/lisp/org-rmail.el
index 0bf44b8..35bf073 100644
--- a/lisp/org-rmail.el
+++ b/lisp/org-rmail.el
@@ -43,8 +43,7 @@
 (defvar rmail-file-name)        ; From rmail.el
 
 ;; Install the link type
-(org-add-link-type "rmail" 'org-rmail-open)
-(add-hook 'org-store-link-functions 'org-rmail-store-link)
+(org-link-set-parameters "rmail" :follow #'org-rmail-open :store 
#'org-rmail-store-link)
 
 ;; Implementation
 (defun org-rmail-store-link ()

commit dc902d132a2a05a44f98e454681f9030464713a1
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:27:55 2016 -0400

    Update mhe link definition.
    
    * lisp/org-mhe.el ("mhe"):
    Define link with org-link-set-parameters.

diff --git a/lisp/org-mhe.el b/lisp/org-mhe.el
index 2ee21de..c793eed 100644
--- a/lisp/org-mhe.el
+++ b/lisp/org-mhe.el
@@ -74,8 +74,7 @@ supported by MH-E."
 (defvar mh-search-regexp-builder)
 
 ;; Install the link type
-(org-add-link-type "mhe" 'org-mhe-open)
-(add-hook 'org-store-link-functions 'org-mhe-store-link)
+(org-link-set-parameters "mhe" :follow #'org-mhe-open :store 
#'org-mhe-store-link)
 
 ;; Implementation
 (defun org-mhe-store-link ()

commit a27489a2ae414399730ca76ae8703c8ae1971623
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:27:45 2016 -0400

    Update irc link definition
    
    * lisp/org-irc.el ("irc"):
    Define link with org-link-set-parameters.

diff --git a/lisp/org-irc.el b/lisp/org-irc.el
index 81d0296..5b9c839 100644
--- a/lisp/org-irc.el
+++ b/lisp/org-irc.el
@@ -71,9 +71,7 @@
 
 ;; Generic functions/config (extend these for other clients)
 
-(add-to-list 'org-store-link-functions 'org-irc-store-link)
-
-(org-add-link-type "irc" 'org-irc-visit nil)
+(org-link-set-parameters "irc" :follow #'org-irc-visit :store 
#'org-irc-store-link)
 
 (defun org-irc-visit (link)
   "Parse LINK and dispatch to the correct function based on the client found."

commit 4f07b7d6beb8b79b2f73ce3aa074b9efa88725c5
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:27:32 2016 -0400

    Update info link definition
    
    * lisp/org-info.el ("info"):
    Update link definition with org-link-set-parameters and change a doc string 
to
    point to org-link-parameters.

diff --git a/lisp/org-info.el b/lisp/org-info.el
index 9e8fde0..8765c53 100644
--- a/lisp/org-info.el
+++ b/lisp/org-info.el
@@ -40,8 +40,10 @@
 (defvar Info-current-node)
 
 ;; Install the link type
-(org-add-link-type "info" 'org-info-open 'org-info-export)
-(add-hook 'org-store-link-functions 'org-info-store-link)
+(org-link-set-parameters "info"
+                        :follow #'org-info-open
+                        :export #'org-info-export
+                        :store #'org-info-store-link)
 
 ;; Implementation
 (defun org-info-store-link ()
@@ -113,7 +115,7 @@ emacs related documents. See 
`org-info-official-gnu-document' and
 
 (defun org-info-export (path desc format)
   "Export an info link.
-See `org-add-link-type' for details about PATH, DESC and FORMAT."
+See `org-link-parameters' for details about PATH, DESC and FORMAT."
   (when (eq format 'html)
     (or (string-match "\\(.*\\)[#:]:?\\(.*\\)" path)
        (string-match "\\(.*\\)" path))

commit fbcd5a394f42ebdf2b322d0ddb62fd269cdfff7a
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:27:14 2016 -0400

    Update gnus link definition
    
    * lisp/org-gnus.el ("gnus"):
    Update link definition with org-link-set-parameters.

diff --git a/lisp/org-gnus.el b/lisp/org-gnus.el
index 386d6dc..13e28cc 100644
--- a/lisp/org-gnus.el
+++ b/lisp/org-gnus.el
@@ -74,8 +74,7 @@ this variable to t."
   :type 'boolean)
 
 ;; Install the link type
-(org-add-link-type "gnus" 'org-gnus-open)
-(add-hook 'org-store-link-functions 'org-gnus-store-link)
+(org-link-set-parameters "gnus" :follow #'org-gnus-open :store 
#'org-gnus-store-link)
 
 ;; Implementation
 

commit e20a185f461f53391368812a152efe0ecc2d53a7
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:27:03 2016 -0400

    Update eshell link definition
    
    * lisp/org-eshell.el ("eshell"):
    
    Update to use org-link-set-parameters.

diff --git a/lisp/org-eshell.el b/lisp/org-eshell.el
index 1919f6d..6f9a18a 100644
--- a/lisp/org-eshell.el
+++ b/lisp/org-eshell.el
@@ -27,8 +27,9 @@
 (require 'eshell)
 (require 'esh-mode)
 
-(org-add-link-type "eshell" 'org-eshell-open)
-(add-hook 'org-store-link-functions 'org-eshell-store-link)
+(org-link-set-parameters "eshell"
+                        :follow #'org-eshell-open
+                        :store #'org-eshell-store-link)
 
 (defun org-eshell-open (link)
   "Switch to am eshell buffer and execute a command line.

commit d00ff860b602287eedf4ba573fae6df494476ce6
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:26:28 2016 -0400

    Update docview link definition
    
    * lisp/org-docview.el ("docview"):
    
    Update link definition with org-link-set-parameters.

diff --git a/lisp/org-docview.el b/lisp/org-docview.el
index fbc5551..3d4df40 100644
--- a/lisp/org-docview.el
+++ b/lisp/org-docview.el
@@ -49,8 +49,10 @@
 (declare-function doc-view-goto-page "doc-view" (page))
 (declare-function image-mode-window-get "image-mode" (prop &optional winprops))
 
-(org-add-link-type "docview" 'org-docview-open 'org-docview-export)
-(add-hook 'org-store-link-functions 'org-docview-store-link)
+(org-link-set-parameters "docview"
+                        :follow #'org-docview-open
+                        :export #'org-docview-export
+                        :store #'org-docview-store-link)
 
 (defun org-docview-export (link description format)
   "Export a docview link from Org files."

commit dfae434d21995d36d69aea3c5bec2a2d4ae72b05
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:26:04 2016 -0400

    Update bibtex link definition
    
    * lisp/org-bibtex.el ("bibtex"):
    
    Change link definition to use org-link-set-parameters

diff --git a/lisp/org-bibtex.el b/lisp/org-bibtex.el
index 74e32f7..e740353 100644
--- a/lisp/org-bibtex.el
+++ b/lisp/org-bibtex.el
@@ -452,8 +452,9 @@ With optional argument OPTIONAL, also prompt for optional 
fields."
 
 
 ;;; Bibtex link functions
-(org-add-link-type "bibtex" 'org-bibtex-open)
-(add-hook 'org-store-link-functions 'org-bibtex-store-link)
+(org-link-set-parameters "bibtex"
+                        :follow #'org-bibtex-open
+                        :store #'org-bibtex-store-link)
 
 (defun org-bibtex-open (path)
   "Visit the bibliography entry on PATH."

commit a35516ec1a10bcaa85a9d02846ed69ed1eb86ba8
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:25:39 2016 -0400

    Update bbdb link definition
    
    * lisp/org-bbdb.el ("bbdb"):
    
    Change link definition to org-link-set-parameters

diff --git a/lisp/org-bbdb.el b/lisp/org-bbdb.el
index 8d886cd..5f3971b 100644
--- a/lisp/org-bbdb.el
+++ b/lisp/org-bbdb.el
@@ -194,10 +194,12 @@ date year)."
   :group 'org-bbdb-anniversaries
   :require 'bbdb)
 
-
 ;; Install the link type
-(org-add-link-type "bbdb" 'org-bbdb-open 'org-bbdb-export)
-(add-hook 'org-store-link-functions 'org-bbdb-store-link)
+(org-link-set-parameters "bbdb"
+                        :follow #'org-bbdb-open
+                        :export #'org-bbdb-export
+                        :complete #'org-bbdb-complete-link
+                        :store #'org-bbdb-store-link)
 
 ;; Implementation
 (defun org-bbdb-store-link ()

commit 60ee24064afad1c054fd4c50ddecef9f58eb19c6
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:22:24 2016 -0400

    Make plain and bracketed link properties stick
    
    * lisp/org.el (org-set-font-lock-defaults): If t is after the face, than
      org-link clobbers everything from the activation functions.

diff --git a/lisp/org.el b/lisp/org.el
index 9340b87..d7bb5fc 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -6520,8 +6520,8 @@ needs to be inserted at a specific position in the 
font-lock sequence.")
           ;; Links
           (when (memq 'tag lk) '(org-activate-tags (1 'org-tag prepend)))
           (when (memq 'angle lk) '(org-activate-angle-links (0 'org-link t)))
-          (when (memq 'plain lk) '(org-activate-plain-links (0 'org-link t)))
-          (when (memq 'bracket lk) '(org-activate-bracket-links (0 'org-link 
t)))
+          (when (memq 'plain lk) '(org-activate-plain-links (0 'org-link)))
+          (when (memq 'bracket lk) '(org-activate-bracket-links (0 'org-link)))
           (when (memq 'radio lk) '(org-activate-target-links (1 'org-link t)))
           (when (memq 'date lk) '(org-activate-dates (0 'org-date t)))
           (when (memq 'footnote lk) '(org-activate-footnote-links))

commit 7d764309e1d00fd5e0092f5c5ea264fe1e7929a2
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:21:50 2016 -0400

    Update `org-activate-bracket-links'
    
    * lisp/org.el (org-activate-bracket-links): Use `org-link-parameters' to
      build link properties.

diff --git a/lisp/org.el b/lisp/org.el
index 760db41..9340b87 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -6167,14 +6167,67 @@ by a #."
   (when (and (re-search-forward org-bracket-link-regexp limit t)
             (not (org-in-src-block-p)))
     (let* ((hl (match-string-no-properties 1))
-          (help (concat "LINK: " (save-match-data (org-link-unescape hl))))
-          (ip (list 'invisible 'org-link
-                    'keymap org-mouse-map 'mouse-face 'highlight
-                    'font-lock-multiline t 'help-echo help
-                    'htmlize-link `(:uri ,hl)))
-          (vp (list 'keymap org-mouse-map 'mouse-face 'highlight
-                    'font-lock-multiline t 'help-echo help
-                    'htmlize-link `(:uri ,hl))))
+          (type (save-match-data
+                  (and (string-match org-plain-link-re hl)
+                       (match-string-no-properties 1 hl))))
+          (path (save-match-data
+                  (and (string-match org-plain-link-re hl)
+                       (match-string-no-properties 2 hl))))
+          (link-start (match-beginning 0))
+          (link-end (match-end 0))
+          (bracketp t)
+          (help-echo (org-link-get-parameter type :help-echo))
+          (help (cond
+                 ((stringp help-echo)
+                  help-echo)
+                 ((functionp help-echo)
+                  help-echo)
+                 (t
+                  (concat "LINK: "
+                          (save-match-data
+                            (org-link-unescape hl))))))
+          (link-face (org-link-get-parameter type :face))
+          (face (cond
+                 ;; A function that returns a face
+                 ((functionp link-face)
+                  (funcall link-face path))
+                 ;; a face
+                 ((facep link-face)
+                  link-face)
+                 ;; An anonymous face
+                 ((consp link-face)
+                  link-face)
+                 ;; default
+                 (t
+                  'org-link)))
+          (keymap (or (org-link-get-parameter type :keymap)
+                      org-mouse-map))
+          (mouse-face (or (org-link-get-parameter type :mouse-face)
+                          'highlight))
+          (htmlize (org-link-get-parameter type :htmlize-link))
+          (htmlize-link (cond
+                         ((functionp htmlize)
+                          (funcall htmlize))
+                         (t
+                          `(:uri ,(format "%s:%s" type path)))))
+          (activate-func (org-link-get-parameter type :activate-func))
+          ;; invisible part
+          (ip (list 'invisible (or
+                                (org-link-get-parameter type :display)
+                                'org-link)
+                    'face face
+                    'keymap keymap
+                    'mouse-face mouse-face
+                    'font-lock-multiline t
+                    'help-echo help
+                    'htmlize-link htmlize-link))
+          ;; visible part
+          (vp (list 'keymap keymap
+                    'face face
+                    'mouse-face mouse-face
+                    'font-lock-multiline t
+                    'help-echo help
+                    'htmlize-link htmlize-link)))
       ;; We need to remove the invisible property here.  Table narrowing
       ;; may have made some of this invisible.
       (org-remove-flyspell-overlays-in (match-beginning 0) (match-end 0))
@@ -6194,6 +6247,8 @@ by a #."
        (org-rear-nonsticky-at (match-end 1))
        (add-text-properties (match-end 1) (match-end 0) ip)
        (org-rear-nonsticky-at (match-end 0)))
+      (when activate-func
+       (funcall activate-func link-start link-end path bracketp))
       t)))
 
 (defun org-activate-dates (limit)

commit 8567e2e2ef7e3ba53dda05aaa134e3636524b4a0
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:21:08 2016 -0400

    Update `org-activate-plain-links'
    
    * lisp/org.el (org-activate-plain-links): Use `org-link-parameters' to
      create the link properties.

diff --git a/lisp/org.el b/lisp/org.el
index 85af56b..760db41 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -5927,17 +5927,57 @@ prompted for."
   "Add link properties for plain links."
   (when (and (re-search-forward org-plain-link-re limit t)
             (not (org-in-src-block-p)))
-    (let ((face (get-text-property (max (1- (match-beginning 0)) (point-min))
-                                  'face))
-         (link (match-string-no-properties 0)))
+
+    (let* ((face (get-text-property (max (1- (match-beginning 0)) (point-min))
+                                   'face))
+          (link (match-string-no-properties 0))
+          (type (match-string-no-properties 1))
+          (path (match-string-no-properties 2))
+          (link-start (match-beginning 0))
+          (link-end (match-end 0))
+          (link-face (org-link-get-parameter type :face))
+          (help-echo (org-link-get-parameter type :help-echo))    
+          (htmlize-link (org-link-get-parameter type :htmlize-link))
+          (activate-func (org-link-get-parameter type :activate-func)))
       (unless (if (consp face) (memq 'org-tag face) (eq 'org-tag face))
        (org-remove-flyspell-overlays-in (match-beginning 0) (match-end 0))
        (add-text-properties (match-beginning 0) (match-end 0)
-                            (list 'mouse-face 'highlight
-                                  'face 'org-link
-                                  'htmlize-link `(:uri ,link)
-                                  'keymap org-mouse-map))
+                            (list
+                             'mouse-face (or (org-link-get-parameter type 
:mouse-face)
+                                             'highlight)
+                             'face (cond
+                                    ;; A function that returns a face
+                                    ((functionp link-face)
+                                     (funcall link-face path))
+                                    ;; a face
+                                    ((facep link-face)
+                                     link-face)
+                                    ;; An anonymous face
+                                    ((consp link-face)
+                                     link-face)
+                                    ;; default
+                                    (t
+                                     'org-link))
+                             'help-echo (cond
+                                         ((stringp help-echo)
+                                          help-echo)
+                                         ((functionp help-echo)
+                                          help-echo)
+                                         (t
+                                          (concat "LINK: "
+                                                  (save-match-data
+                                                    (org-link-unescape 
link)))))
+                             'htmlize-link (cond
+                                            ((functionp htmlize-link)
+                                             (funcall htmlize-link path))
+                                            (t
+                                             `(:uri ,link)))
+                             'keymap (or (org-link-get-parameter type :keymap)
+                                         org-mouse-map)
+                             'org-link-start (match-beginning 0)))
        (org-rear-nonsticky-at (match-end 0))
+       (when activate-func
+         (funcall activate-func link-start link-end path nil))
        t))))
 
 (defun org-activate-code (limit)

commit 81c5b375315166f14a3c2bf73d07621bc655ab02
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:20:23 2016 -0400

    Get the complete function from `org-link-parameters'
    
    * lisp/org.el (org-link-try-special-completion):
    Get the follow function from `org-link-parameters'
    
    Only follow when a function is defined.
    
    * lisp/org.el (org-open-at-point): Some links don't have a :follow
      function, so we should not call nil in that case.

diff --git a/lisp/org.el b/lisp/org.el
index 9660856..85af56b 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -10464,7 +10464,7 @@ Use TAB to complete link prefixes, then RET for 
type-specific completion support
 
 (defun org-link-try-special-completion (type)
   "If there is completion support for link type TYPE, offer it."
-  (let ((fun (intern (concat "org-" type "-complete-link"))))
+  (let ((fun (org-link-get-parameter type :complete)))
     (if (functionp fun)
        (funcall fun)
       (read-string "Link (no completion support): " (concat type ":")))))

commit f9d0ca3244570d7289742bc2976a10b00e7d7fbd
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:16:38 2016 -0400

    Remove `org-link-protocols'
    
    * lisp/org.el (org-link-protocols): Remove variable org-link-protocols.
    The data in this variable is now retrieved with org-link-get-parameter.

diff --git a/lisp/org.el b/lisp/org.el
index 6f3e931..9660856 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -10742,7 +10742,7 @@ link in a property drawer line."
               ((equal type "file")
                (if (string-match "[*?{]" (file-name-nondirectory path))
                    (dired path)
-                 ;; Look into `org-link-protocols' in order to find
+                 ;; Look into `org-link-parameters' in order to find
                  ;; a DEDICATED-FUNCTION to open file.  The function
                  ;; will be applied on raw link instead of parsed
                  ;; link due to the limitation in `org-add-link-type'
@@ -10756,7 +10756,7 @@ link in a property drawer line."
                  (let* ((option (org-element-property :search-option link))
                         (app (org-element-property :application link))
                         (dedicated-function
-                         (nth 1 (assoc app org-link-protocols))))
+                         (org-link-get-parameter type :follow)))
                    (if dedicated-function
                        (funcall dedicated-function
                                 (concat path
@@ -10771,8 +10771,8 @@ link in a property drawer line."
                                    (list (string-to-number option)))
                                   (t (list nil
                                            (org-link-unescape option)))))))))
-              ((assoc type org-link-protocols)
-               (funcall (nth 1 (assoc type org-link-protocols)) path))
+              ((functionp (org-link-get-parameter type :follow))
+               (funcall (org-link-get-parameter type :follow) path))
               ((equal type "help")
                (let ((f-or-v (intern path)))
                  (cond ((fboundp f-or-v) (describe-function f-or-v))
@@ -10821,7 +10821,7 @@ link in a property drawer line."
                    (user-error "Abort"))))
               ((equal type "id")
                (require 'org-id)
-               (funcall (nth 1 (assoc "id" org-link-protocols)) path))
+               (funcall (org-link-get-parameter type :follow) path))
               ((member type '("coderef" "custom-id" "fuzzy" "radio"))
                (unless (run-hook-with-args-until-success
                         'org-open-link-functions path)
diff --git a/lisp/ox.el b/lisp/ox.el
index 3986ec3..8472e9d 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -4116,7 +4116,7 @@ The function ignores links with an implicit type (e.g.,
   (let ((type (org-element-property :type link)))
     (unless (or (member type '("coderef" "custom-id" "fuzzy" "radio"))
                (not backend))
-      (let ((protocol (nth 2 (assoc type org-link-protocols))))
+      (let ((protocol (org-link-get-parameter type :export)))
        (and (functionp protocol)
             (funcall protocol
                      (org-link-unescape (org-element-property :path link))

commit 838bbb08082170042867682444c771b546498d70
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:07:10 2016 -0400

    Remove `org-link-types' variable
    
    * lisp/org.el (org-link-types): Remove this variable.
    
    * lisp/org.el: The `org-link-types' variable was replaced with the
      `org-link-types' function everywhere.

diff --git a/lisp/org-element.el b/lisp/org-element.el
index 269bc7d..9452641 100644
--- a/lisp/org-element.el
+++ b/lisp/org-element.el
@@ -185,7 +185,7 @@ specially in `org-element--object-lex'.")
                "\\)\\)")
        org-element--object-regexp
        (mapconcat #'identity
-                  (let ((link-types (regexp-opt org-link-types)))
+                  (let ((link-types (regexp-opt (org-link-types))))
                     (list
                      ;; Sub/superscript.
                      "\\(?:[_^][-{(*+.,[:alnum:]]\\)"
@@ -3108,7 +3108,7 @@ Assume point is at the beginning of the link."
              (string-match "\\`\\.\\.?/" raw-link))
          (setq type "file")
          (setq path raw-link))
-        ;; Explicit type (http, irc, bbdb...).  See `org-link-types'.
+        ;; Explicit type (http, irc, bbdb...).  
         ((string-match org-link-types-re raw-link)
          (setq type (match-string 1 raw-link))
          (setq path (substring raw-link (match-end 0))))
diff --git a/lisp/org.el b/lisp/org.el
index 5fbffd0..6f3e931 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -1802,10 +1802,11 @@ activation.  The function must accept (link-start 
link-end path bracketp)
 as arguments."
   :group 'org-link
   :type '(alist :tag "Link display paramters"
-               :value-type (plist)))
+               :value-type plist))
 
 (defun org-link-get-parameter (type key)
-  "Get TYPE link property for KEY."
+  "Get TYPE link property for KEY.
+TYPE is a string and KEY is a plist keyword."
   (plist-get
    (cdr (assoc type org-link-parameters))
    key))
@@ -1814,11 +1815,7 @@ as arguments."
   "Set link TYPE properties to PARAMETERS.
   PARAMETERS should be :key val pairs."
   (let ((data (assoc type org-link-parameters)))
-    (if data
-       (cl-loop for (key val) on parameters by #'cddr
-                do
-                (setf (cl-getf (cdr data) key)
-                      val))
+    (if data (setcdr data (org-combine-plists (cdr data) parameters))
       (push (cons type parameters) org-link-parameters)
       (org-make-link-regexps)
       (org-element-update-syntax))))
@@ -5727,9 +5724,6 @@ the rounding returns a past time."
 (require 'font-lock)
 
 (defconst org-non-link-chars "]\t\n\r<>")
-(defvar org-link-types '("http" "https" "ftp" "mailto" "file" "file+emacs"
-                        "file+sys" "news" "shell" "elisp" "doi" "message"
-                        "help"))
 (defvar org-link-types-re nil
   "Matches a link that has a url-like prefix like \"http:\"")
 (defvar org-link-re-with-space nil
@@ -5796,8 +5790,8 @@ stacked delimiters is N.  Escaping delimiters is not 
possible."
 
 (defun org-make-link-regexps ()
   "Update the link regular expressions.
-This should be called after the variable `org-link-types' has changed."
-  (let ((types-re (regexp-opt org-link-types t)))
+This should be called after the variable `org-link-parameters' has changed."
+  (let ((types-re (regexp-opt (org-link-types) t)))
     (setq org-link-types-re
          (concat "\\`" types-re ":")
          org-link-re-with-space
@@ -5835,7 +5829,7 @@ This should be called after the variable `org-link-types' 
has changed."
          org-bracket-link-analytic-regexp++
          (concat
           "\\[\\["
-          "\\(" (regexp-opt (cons "coderef" org-link-types) t) ":\\)?"
+          "\\(" (regexp-opt (cons "coderef" (org-link-types)) t) ":\\)?"
           "\\([^]]+\\)"
           "\\]"
           "\\(\\[" "\\([^]]+\\)" "\\]\\)?"
@@ -10366,7 +10360,7 @@ Use TAB to complete link prefixes, then RET for 
type-specific completion support
        (and (window-live-p cw) (select-window cw)))
       (setq all-prefixes (append (mapcar 'car abbrevs)
                                 (mapcar 'car org-link-abbrev-alist)
-                                org-link-types))
+                                (org-link-types)))
       (unwind-protect
          ;; Fake a link history, containing the stored links.
          (let ((org--links-history

commit 28f43b0ba61db603bb0db39ac5c281fc8bcdf61e
Author: John Kitchin <address@hidden>
Date:   Tue Jul 5 10:08:14 2016 -0400

    Add `org-link-parameters' variable and functions
    
    * lisp/org.el (org-link-parameters): Add new centralized link variable.
    
    (org-link-get-parameter): A getter function to get link parameters.
    
    (org-link-set-parameters): A setter function to set link parameters or
    add new ones.
    
    (org-link-types): A function to return a list of link types.
    
    * lisp/org.el org-add-link-type: deprecated and now calls
      `org-link-set-parameters'. `org-link-add-type' was moved to
      org-compat.el
    
    * lisp/org.el (org-store-link-functions):
       Add `org-store-link-functions'  to return list of store functions.
    
    * lisp/org.el: Replace the variable `org-store-link-functions' with a
      function `org-store-link-functions'.
    
    * lisp/ox.el: change reference in a comment.
    
    * testing/lisp/test-ox.el (test-org-export/custom-protocol-maybe):
    Remove references to org-link-types and use org-link-set-parameters instead.

diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index 92fdb1c..a856ff7 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -374,6 +374,37 @@ Implements `define-error' for older emacsen."
     (put name 'error-conditions
         (copy-sequence (cons name (get 'error 'error-conditions))))))
 
+(defun org-add-link-type (type &optional follow export)
+  "Add a new TYPE link.
+FOLLOW and EXPORT are two functions.
+
+FOLLOW should take the link path as the single argument and do whatever
+is necessary to follow the link, for example find a file or display
+a mail message.
+
+EXPORT should format the link path for export to one of the export formats.
+It should be a function accepting three arguments:
+
+  path    the path of the link, the text after the prefix (like \"http:\")
+  desc    the description of the link, if any
+  format  the export format, a symbol like `html' or `latex' or `ascii'.
+
+The function may use the FORMAT information to return different values
+depending on the format.  The return value will be put literally into
+the exported file.  If the return value is nil, this means Org should
+do what it normally does with links which do not have EXPORT defined.
+
+Org mode has a built-in default for exporting links.  If you are happy with
+this default, there is no need to define an export function for the link
+type.  For a simple example of an export function, see `org-bbdb.el'.
+
+If TYPE already exists, update it with the arguments.
+See `org-link-parameters' for documentation on the other parameters."
+  (org-link-add type :follow follow :export export) 
+  (message "Created %s link." type))
+
+(make-obsolete 'org-add-link-type "org-link-add." "Org 9.0")
+
 (provide 'org-compat)
 
 ;;; org-compat.el ends here
diff --git a/lisp/org.el b/lisp/org.el
index 2202d41..5fbffd0 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -1758,6 +1758,75 @@ calls `table-recognize-table'."
   "Buffer-local version of `org-link-abbrev-alist', which see.
 The value of this is taken from the #+LINK lines.")
 
+(defcustom org-link-parameters
+  '(("http") ("https") ("ftp") ("mailto")
+    ("file" :complete 'org-file-complete-link)
+    ("file+emacs") ("file+sys")
+    ("news") ("shell") ("elisp")
+    ("doi") ("message") ("help"))
+  "An alist of properties that defines all the links in Org mode.
+The key in each association is a string of the link type.
+Subsequent optional elements make up a p-list of link properties.
+
+:follow - A function that takes the link path as an argument.
+
+:export - A function that takes the link path, description and
+export-backend as arguments.
+
+:store - A function responsible for storing the link.  See the
+variable `org-store-link-functions'.
+
+:complete - A function that inserts a link with completion.  The
+function takes one optional prefix arg.
+
+:face - A face for the link, or a function that returns a face.
+The function takes one argument which is the link path.  The
+default face is `org-link'.
+
+:mouse-face - The mouse-face. The default is `highlight'.
+
+:display - `full' will not fold the link in descriptive
+display.  Default is `org-link'.
+
+:help-echo - A string or function that takes (window object position)
+as args and returns a string.
+
+:keymap - A keymap that is active on the link.  The default is
+`org-mouse-map'.
+
+:htmlize-link - A function for the htmlize-link.  Defaults
+to (list :uri \"type:path\")
+
+:activate-func - A function to run at the end of font-lock
+activation.  The function must accept (link-start link-end path bracketp) 
+as arguments."
+  :group 'org-link
+  :type '(alist :tag "Link display paramters"
+               :value-type (plist)))
+
+(defun org-link-get-parameter (type key)
+  "Get TYPE link property for KEY."
+  (plist-get
+   (cdr (assoc type org-link-parameters))
+   key))
+
+(defun org-link-set-parameters (type &rest parameters)
+  "Set link TYPE properties to PARAMETERS.
+  PARAMETERS should be :key val pairs."
+  (let ((data (assoc type org-link-parameters)))
+    (if data
+       (cl-loop for (key val) on parameters by #'cddr
+                do
+                (setf (cl-getf (cdr data) key)
+                      val))
+      (push (cons type parameters) org-link-parameters)
+      (org-make-link-regexps)
+      (org-element-update-syntax))))
+
+(defun org-link-types ()
+  "Returns a list of known link types."
+  (mapcar #'car org-link-parameters))
+
 (defcustom org-link-abbrev-alist nil
   "Alist of link abbreviations.
 The car of each element is a string, to be replaced at the start of a link.
@@ -5490,7 +5559,7 @@ The following commands are available:
      org-display-table 4
      (vconcat (mapcar
               (lambda (c) (make-glyph-code c (and (not (stringp org-ellipsis))
-                                             org-ellipsis)))
+                                                  org-ellipsis)))
               (if (stringp org-ellipsis) org-ellipsis "..."))))
     (setq buffer-display-table org-display-table))
   (org-set-regexps-and-options)
@@ -7393,7 +7462,7 @@ a block.  Return a non-nil value when toggling is 
successful."
 ;; Remove overlays when changing major mode
 (add-hook 'org-mode-hook
          (lambda () (add-hook 'change-major-mode-hook
-                         'org-show-block-all 'append 'local)))
+                              'org-show-block-all 'append 'local)))
 
 ;;; Org-goto
 
@@ -9666,60 +9735,32 @@ The refresh happens only for the current tree (not 
subtree)."
 (defvar org-store-link-plist nil
   "Plist with info about the most recently link created with 
`org-store-link'.")
 
-(defvar org-link-protocols nil
-  "Link protocols added to Org-mode using `org-add-link-type'.")
+(defun org-store-link-functions ()
+  "Returns a list of functions that are called to create and store a link.
+The functions defined in the :store property of
+`org-link-parameters'.
 
-(defvar org-store-link-functions nil
-  "List of functions that are called to create and store a link.
 Each function will be called in turn until one returns a non-nil
-value.  Each function should check if it is responsible for creating
-this link (for example by looking at the major mode).
-If not, it must exit and return nil.
-If yes, it should return a non-nil value after a calling
-`org-store-link-props' with a list of properties and values.
-Special properties are:
+value.  Each function should check if it is responsible for
+creating this link (for example by looking at the major mode).  If
+not, it must exit and return nil.  If yes, it should return a
+non-nil value after a calling `org-store-link-props' with a list
+of properties and values. Special properties are:
 
 :type         The link prefix, like \"http\".  This must be given.
 :link         The link, like \"http://www.astro.uva.nl/~dominik\";.
               This is obligatory as well.
 :description  Optional default description for the second pair
               of brackets in an Org-mode link.  The user can still change
-              this when inserting this link into an Org-mode buffer.
+              this when inserting this link into an Org mode buffer.
 
 In addition to these, any additional properties can be specified
-and then used in capture templates.")
-
-(defun org-add-link-type (type &optional follow export)
-  "Add TYPE to the list of `org-link-types'.
-Re-compute all regular expressions depending on `org-link-types'
-
-FOLLOW and EXPORT are two functions.
-
-FOLLOW should take the link path as the single argument and do whatever
-is necessary to follow the link, for example find a file or display
-a mail message.
-
-EXPORT should format the link path for export to one of the export formats.
-It should be a function accepting three arguments:
-
-  path    the path of the link, the text after the prefix (like \"http:\")
-  desc    the description of the link, if any
-  format  the export format, a symbol like `html' or `latex' or `ascii'.
-
-The function may use the FORMAT information to return different values
-depending on the format.  The return value will be put literally into
-the exported file.  If the return value is nil, this means Org should
-do what it normally does with links which do not have EXPORT defined.
-
-Org mode has a built-in default for exporting links.  If you are happy with
-this default, there is no need to define an export function for the link
-type.  For a simple example of an export function, see `org-bbdb.el'."
-  (add-to-list 'org-link-types type t)
-  (org-make-link-regexps)
-  (org-element-update-syntax)
-  (if (assoc type org-link-protocols)
-      (setcdr (assoc type org-link-protocols) (list follow export))
-    (push (list type follow export) org-link-protocols)))
+and then used in capture templates."
+  (cl-loop for link in org-link-parameters
+          with store-func
+          do (setq store-func (org-link-get-parameter (car link) :store))
+          if store-func
+          collect store-func))
 
 (defvar org-agenda-buffer-name) ; Defined in org-agenda.el
 (defvar org-id-link-to-org-use-id) ; Defined in org-id.el
@@ -9764,7 +9805,7 @@ active region."
                    (delq
                     nil (mapcar (lambda (f)
                                   (let (fs) (if (funcall f) (push f fs))))
-                                org-store-link-functions))
+                                (org-store-link-functions)))
                    sfunsn (mapcar (lambda (fu) (symbol-name (car fu))) sfuns))
              (or (and (cdr sfuns)
                       (funcall (intern
diff --git a/lisp/ox.el b/lisp/ox.el
index da985f3..3986ec3 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -4073,7 +4073,7 @@ meant to be translated with `org-export-data' or alike."
 ;;;; For Links
 ;;
 ;; `org-export-custom-protocol-maybe' handles custom protocol defined
-;; with `org-add-link-type', which see.
+;; in `org-link-parameters'.
 ;;
 ;; `org-export-get-coderef-format' returns an appropriate format
 ;; string for coderefs.
diff --git a/testing/lisp/test-ox.el b/testing/lisp/test-ox.el
index 8b07cca..09d2e2a 100644
--- a/testing/lisp/test-ox.el
+++ b/testing/lisp/test-ox.el
@@ -2571,8 +2571,8 @@ Para2"
   (should
    (string-match
     "success"
-    (let ((org-link-types (copy-sequence org-link-types)))
-      (org-add-link-type "foo" nil (lambda (p d f) "success"))
+    (progn
+      (org-link-set-parameters "foo" :export (lambda (p d f) "success"))
       (org-export-string-as
        "[[foo:path]]"
        (org-export-create-backend
@@ -2586,9 +2586,9 @@ Para2"
   (should-not
    (string-match
     "success"
-    (let ((org-link-types (copy-sequence org-link-types)))
-      (org-add-link-type
-       "foo" nil (lambda (p d f) (and (eq f 'test) "success")))
+    (progn
+      (org-link-set-parameters
+       "foo" :export (lambda (p d f) (and (eq f 'test) "success")))
       (org-export-string-as
        "[[foo:path]]"
        (org-export-create-backend
@@ -2603,9 +2603,9 @@ Para2"
   (should-not
    (string-match
     "success"
-    (let ((org-link-types (copy-sequence org-link-types)))
-      (org-add-link-type
-       "foo" nil (lambda (p d f) (and (eq f 'test) "success")))
+    (progn
+      (org-link-set-parameters
+       "foo" :export (lambda (p d f) (and (eq f 'test) "success")))
       (org-export-string-as
        "[[foo:path]]"
        (org-export-create-backend


Nicolas Goaziou writes:

> Hello,
>
> John Kitchin <address@hidden> writes:
>
>> Your version doesn't let you add properties to links with no
>> existing properties, e.g. ("http")
>
> There was a typo (spurious `cdr'), the correct version is
>
>   (defun org-link-set-parameters (type &rest parameters)
>     "Set link TYPE properties to PARAMETERS.
>   PARAMETERS should be :key val pairs."
>     (let ((data (assoc type org-link-parameters)))
>       (if data (setcdr data (org-combine-plists (cdr data) parameters))
>         (push (cons type parameters) org-link-parameters)
>         (org-make-link-regexps)
>         (org-element-update-syntax))))
>
>> and it also didn't work as expected to set properties to nil.
>
> Not sure to understand what you mean here. Could you give an example?
>
>> I think I have squashed everything together that makes sense. Let me
>> know if you have further thoughts.
>
> OK. Some comments follow.
>
>> +{{{noindent}}} In-buffer completion (see [[Completion]]) can be used
>> +after {{{samp([)}}} to complete link abbreviations.  You may also
>> +define a function that implements special (e.g., completion) support
>> +for inserting such a link with {{{kbd(C-c C-l)}}}.  Such a function
>> +should not accept any arguments, and return the full link with
>> +prefix. You can set the link completion function like this:
>
> Mind the spaces after sentences.
>
> In any case, updating contrib manual is not top priority, since many
> section needs to be updated anyway.
>
>> +[fn:37] This works if a function has been defined in the :complete
>> +property of a link in org-link-parameters.
>
> ~org-link-parameters~
>
>> -(org-add-link-type "id" 'org-id-open)
>> +(org-link-set-parameters "id" :follow 'org-id-open)
>
> Nitpick: #'org-id-open
>
>> -(add-hook 'org-store-link-functions 'org-w3m-store-link)
>> +(org-link-set-parameters "w3m" :store 'org-w3m-store-link)
>
> #'org-w3m-store-link
>
> You get the idea, I will not comment the other occurrences.
>
>> +       (type (save-match-data
>> +               (if (string-match org-plain-link-re hl)
>> +                   (match-string-no-properties 1 hl)
>> +                 nil)))
>
> Nitpick
>
>   (save-match-data
>     (and (string-match org-plain-link-re hl)
>          (match-string-no-properties 1 hl)))
>
>> +       (path (save-match-data
>> +               (if (string-match org-plain-link-re hl)
>> +                   (match-string-no-properties 2 hl)
>> +                 nil)))
>
> Ditto.
>
>> -           ((assoc type org-link-parameters)
>> +           ((and (assoc type org-link-parameters)
>> +                 (functionp (org-link-get-parameter type :follow)))
>
> I think (functionp ...) is sufficient, no need for the `and' and 
> (assoc type org-link-parameters), which `org-link-get-parameters'
> already takes case of.  So
>
>   ((functionp (org-link-get-parameters type :follow)
>    ...)
>
>>     * lisp/org.el: Replace the variable `org-store-link-functions' with a
>>       function by the same name.
>
> You need to add the name of the function being modified.
>
>>     Update org-add-link-type
>>     
>>     * lisp/org.el org-add-link-type: deprecated and now calls
>>       `org-link-add'.
>>     
>>     Create a new `org-link-add' function for making links.
>
> You probably mean `org-link-set-parameters', since `org-link-add' would
> be but a lesser version of the former.
>
>> +  (org-link-add type :follow follow :export export)
>
> See above.
>
>> +(defun org-store-link-functions ()
>> +  "Returns a list of functions that are called to create and store a link.
>> +The functions in the variable `org-store-link-functions' come
>> +first. These may be user-defined for different contexts. Then
>> +comes the functions defined in the :store property of
>> +org-link-parameters.
>> +
>> +Each function will be called in turn until one returns a non-nil
>> +value. Each function should check if it is responsible for
>> +creating this link (for example by looking at the major mode). If
>> +not, it must exit and return nil. If yes, it should return a
>> +non-nil value after a calling `org-store-link-props' with a list
>> +of properties and values. Special properties are:
>
> Mind the spaces between sentences.
>
> I don't understand why we need to both preserve
> `org-store-link-functions' and use :store property. Wouldn't one
> location be enough?
>
>> +:type         The link prefix, like \"http\".  This must be given.
>> +:link         The link, like \"http://www.astro.uva.nl/~dominik\";.
>> +              This is obligatory as well.
>> +:description  Optional default description for the second pair
>> +              of brackets in an Org-mode link.  The user can still change
>> +              this when inserting this link into an Org-mode buffer.
>
> Org-mode -> Org mode
>
>> +In addition to these, any additional properties can be specified
>> +and then used in capture templates."
>> +  (append
>> +   org-store-link-functions
>> +   (cl-loop for link in org-link-parameters
>> +        with store-func
>> +        do (setq store-func (org-link-get-parameter (car link) :store))
>> +        if store-func
>> +        collect store-func)))
>
> The above looks dubious. You seem to be collection :store values for
> every link type, in addition to user-defined functions. It doesn't make
> sense to run unrelated store functions.
>
>> -           ((assoc type org-link-protocols)
>> -            (funcall (nth 1 (assoc type org-link-protocols)) path))
>> +           ((assoc type org-link-parameters)
>> +            (funcall (org-link-get-parameter type :follow) path))
>
> (assoc type org-link-parameters) -> (functionp (org-link-get-parameter type 
> :follow))
>
>> +(defcustom org-link-parameters
>> +  '(("http") ("https") ("ftp") ("mailto")
>> +    ("file" :complete 'org-file-complete-link)
>> +    ("file+emacs") ("file+sys")
>> +    ("news") ("shell") ("elisp")
>> +    ("doi") ("message") ("help"))
>> +  "An alist of properties that defines all the links in Org mode.
>> +The key in each association is a string of the link type.
>> +Subsequent optional elements make up a p-list of link properties.
>> +
>> +:follow - A function that takes the link path as an argument.
>> +
>> +:export - A function that takes the link path, description and
>> +export-backend as arguments.
>> +
>> +:store - A function responsible for storing the link.  See the
>> +variable `org-store-link-functions'.
>> +
>> +:complete - A function that inserts a link with completion.  The
>> +function takes one optional prefix arg.
>> +
>> +:face - A face for the link, or a function that returns a face.
>> +The function takes one argument which is the link path.  The
>> +default face is `org-link'.
>> +
>> +:mouse-face - The mouse-face. The default is `highlight'.
>> +
>> +:display - `full' will not fold the link in descriptive
>> +display.  Default is `org-link'.
>> +
>> +:help-echo - A string or function that takes (window object position)
>> +as args and returns a string.
>> +
>> +:keymap - A keymap that is active on the link.  The default is
>> +`org-mouse-map'.
>> +
>> +:htmlize-link - A function for the htmlize-link.  Defaults
>> +to (list :uri \"type:path\")
>> +
>> +:activate-func - A function to run at the end of font-lock
>> +activation. The function must accept (link-start link-end path bracketp) 
>              ^^^
>              
>> +as arguments."
>> +  :group 'org-link
>> +  :type '(alist :tag "Link display paramters"
>> +            :value-type (plist)))
>
> Isn't it plist instead of (plist)?
>
>> +(defun org-link-get-parameter (type key)
>> +  "Get TYPE link property for KEY."
>
> We could add that TYPE is string and KEY a keyword.
>
>> +(defun org-link-set-parameters (type &rest parameters)
>> +  "Set link TYPE properties to PARAMETERS.
>> +  PARAMETERS should be :key val pairs."
>> +  (let ((data (assoc type org-link-parameters)))
>> +    (if data
>> +    (cl-loop for (key val) on parameters by #'cddr
>> +       do
>> +       (setf (cl-getf (cdr data) key)
>> +             val))
>> +      (push (cons type parameters) org-link-parameters)
>> +      (org-make-link-regexps)
>> +      (org-element-update-syntax))))
>
> See at the beginning of the message, I didn't give up yet ;)
>
>> commit a4b9ed7783437838f909f3516fb53f32598e803e
>> Author: John Kitchin <address@hidden>
>> Date:   Tue Jul 5 10:07:10 2016 -0400
>>
>>     Remove org-link-types
>>     
>>     * lisp/org.el (org-link-types): Remove this variable.
>>     
>>     * testing/lisp/test-ox.el (test-org-export/custom-protocol-maybe):
>>     
>>     Remove copy-sequence in the tests. Actually it seems like the let
>>     statement is no longer needed. I guess it was around to protect the list
>>     from extra links getting defined. A downside of this is the links may
>>     get added during tests. That does not seem like a big deal if those are
>>     run in batch mode.
>
> The copy-sequence was used to prevent modifying `org-link-types' by
> side-effect. It is not needed anymore since (org-link-types) generates
> a new list every time.
>
> I think we're almost there, barring my stubbornness about
> `org-link-set-parameters'. Thank you for this work.
>
> Regards,


-- 
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



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