lisp/org-protocol.el

   1 ;;; org-protocol.el --- Intercept Calls from Emacsclient to Trigger Custom Actions -*- lexical-binding: t; -*-
   2 ;;
   3 ;; Copyright (C) 2008-2018 Free Software Foundation, Inc.
   4 ;;
   5 ;; Authors: Bastien Guerry <bzg@gnu.org>
   6 ;;       Daniel M German <dmg AT uvic DOT org>
   7 ;;       Sebastian Rose <sebastian_rose AT gmx DOT de>
   8 ;;       Ross Patterson <me AT rpatterson DOT net>
   9 ;; Maintainer: Sebastian Rose <sebastian_rose AT gmx DOT de>
  10 ;; Keywords: org, emacsclient, wp
  11
  12 ;; This file is part of GNU Emacs.
  13 ;;
  14 ;; GNU Emacs is free software: you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation, either version 3 of the License, or
  17 ;; (at your option) any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  26
  27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  28 ;;; Commentary:
  29 ;;
  30 ;; Intercept calls from emacsclient to trigger custom actions.
  31 ;;
  32 ;; This is done by advising `server-visit-files' to scan the list of filenames
  33 ;; for `org-protocol-the-protocol' and sub-protocols defined in
  34 ;; `org-protocol-protocol-alist' and `org-protocol-protocol-alist-default'.
  35 ;;
  36 ;; Any application that supports calling external programs with an URL
  37 ;; as argument may be used with this functionality.
  38 ;;
  39 ;;
  40 ;; Usage:
  41 ;; ------
  42 ;;
  43 ;;   1.) Add this to your init file (.emacs probably):
  44 ;;
  45 ;;       (add-to-list 'load-path "/path/to/org-protocol/")
  46 ;;       (require 'org-protocol)
  47 ;;
  48 ;;   3.) Ensure emacs-server is up and running.
  49 ;;   4.) Try this from the command line (adjust the URL as needed):
  50 ;;
  51 ;;       $ emacsclient \
  52 ;;         org-protocol://store-link?url=http:%2F%2Flocalhost%2Findex.html&title=The%20title
  53 ;;
  54 ;;   5.) Optionally add custom sub-protocols and handlers:
  55 ;;
  56 ;;       (setq org-protocol-protocol-alist
  57 ;;             '(("my-protocol"
  58 ;;                :protocol "my-protocol"
  59 ;;                :function my-protocol-handler-function)))
  60 ;;
  61 ;;       A "sub-protocol" will be found in URLs like this:
  62 ;;
  63 ;;           org-protocol://sub-protocol?key=val&key2=val2
  64 ;;
  65 ;; If it works, you can now setup other applications for using this feature.
  66 ;;
  67 ;;
  68 ;; As of March 2009 Firefox users follow the steps documented on
  69 ;; http://kb.mozillazine.org/Register_protocol, Opera setup is described here:
  70 ;; http://www.opera.com/support/kb/view/535/
  71 ;;
  72 ;;
  73 ;; Documentation
  74 ;; -------------
  75 ;;
  76 ;; org-protocol.el comes with and installs handlers to open sources of published
  77 ;; online content, store and insert the browser's URLs and cite online content
  78 ;; by clicking on a bookmark in Firefox, Opera and probably other browsers and
  79 ;; applications:
  80 ;;
  81 ;;   * `org-protocol-open-source' uses the sub-protocol \"open-source\" and maps
  82 ;;     URLs to local filenames defined in `org-protocol-project-alist'.
  83 ;;
  84 ;;   * `org-protocol-store-link' stores an Org link (if Org is present) and
  85 ;;     pushes the browsers URL to the `kill-ring' for yanking.  This handler is
  86 ;;     triggered through the sub-protocol \"store-link\".
  87 ;;
  88 ;;   * Call `org-protocol-capture' by using the sub-protocol \"capture\".  If
  89 ;;     Org is loaded, Emacs will pop-up a capture buffer and fill the
  90 ;;     template with the data provided.  I.e. the browser's URL is inserted as an
  91 ;;     Org-link of which the page title will be the description part.  If text
  92 ;;     was select in the browser, that text will be the body of the entry.
  93 ;;
  94 ;; You may use the same bookmark URL for all those standard handlers and just
  95 ;; adjust the sub-protocol used:
  96 ;;
  97 ;;     location.href='org-protocol://sub-protocol?url='+
  98 ;;           encodeURIComponent(location.href)+'&title='+
  99 ;;           encodeURIComponent(document.title)+'&body='+
 100 ;;           encodeURIComponent(window.getSelection())
 101 ;;
 102 ;; The handler for the sub-protocol \"capture\" detects an optional template
 103 ;; char that, if present, triggers the use of a special template.
 104 ;; Example:
 105 ;;
 106 ;;     location.href='org-protocol://capture?template=x'+ ...
 107 ;;
 108 ;;  uses template ?x.
 109 ;;
 110 ;; Note that using double slashes is optional from org-protocol.el's point of
 111 ;; view because emacsclient squashes the slashes to one.
 112 ;;
 113 ;;
 114 ;; provides: 'org-protocol
 115 ;;
 116 ;;; Code:
 117
 118 (require 'org)
 119
 120 (declare-function org-publish-get-project-from-filename "ox-publish"
 121                   (filename &optional up))
 122 (declare-function server-edit "server" (&optional arg))
 123
 124 (defvar org-capture-link-is-already-stored)
 125
 126 (defgroup org-protocol nil
 127   "Intercept calls from emacsclient to trigger custom actions.
 128
 129 This is done by advising `server-visit-files' to scan the list of filenames
 130 for `org-protocol-the-protocol' and sub-protocols defined in
 131 `org-protocol-protocol-alist' and `org-protocol-protocol-alist-default'."
 132   :version "22.1"
 133   :group 'convenience
 134   :group 'org)
 135
 136
 137 ;;; Variables:
 138
 139 (defconst org-protocol-protocol-alist-default
 140   '(("org-capture"     :protocol "capture"     :function org-protocol-capture  :kill-client t)
 141     ("org-store-link"  :protocol "store-link"  :function org-protocol-store-link)
 142     ("org-open-source" :protocol "open-source" :function org-protocol-open-source))
 143   "Default protocols to use.
 144 See `org-protocol-protocol-alist' for a description of this variable.")
 145
 146 (defconst org-protocol-the-protocol "org-protocol"
 147   "This is the protocol to detect if org-protocol.el is loaded.
 148 `org-protocol-protocol-alist-default' and `org-protocol-protocol-alist' hold
 149 the sub-protocols that trigger the required action.  You will have to define
 150 just one protocol handler OS-wide (MS-Windows) or per application (Linux).
 151 That protocol handler should call emacsclient.")
 152
 153 ;;; User variables:
 154
 155 (defcustom org-protocol-reverse-list-of-files t
 156   "Non-nil means re-reverse the list of filenames passed on the command line.
 157 The filenames passed on the command line are passed to the emacs-server in
 158 reverse order.  Set to t (default) to re-reverse the list, i.e. use the
 159 sequence on the command line.  If nil, the sequence of the filenames is
 160 unchanged."
 161   :group 'org-protocol
 162   :type 'boolean)
 163
 164 (defcustom org-protocol-project-alist nil
 165   "Map URLs to local filenames for `org-protocol-open-source' (open-source).
 166
 167 Each element of this list must be of the form:
 168
 169   (module-name :property value property: value ...)
 170
 171 where module-name is an arbitrary name.  All the values are strings.
 172
 173 Possible properties are:
 174
 175   :online-suffix     - the suffix to strip from the published URLs
 176   :working-suffix    - the replacement for online-suffix
 177   :base-url          - the base URL, e.g. http://www.example.com/project/
 178                        Last slash required.
 179   :working-directory - the local working directory.  This is, what base-url will
 180                        be replaced with.
 181   :redirects         - A list of cons cells, each of which maps a regular
 182                        expression to match to a path relative to :working-directory.
 183
 184 Example:
 185
 186    (setq org-protocol-project-alist
 187        \\='((\"https://orgmode.org/worg/\"
 188           :online-suffix \".php\"
 189           :working-suffix \".org\"
 190           :base-url \"https://orgmode.org/worg/\"
 191           :working-directory \"/home/user/org/Worg/\")
 192          (\"http://localhost/org-notes/\"
 193           :online-suffix \".html\"
 194           :working-suffix \".org\"
 195           :base-url \"http://localhost/org/\"
 196           :working-directory \"/home/user/org/\"
 197           :rewrites ((\"org/?$\" . \"index.php\")))
 198          (\"Hugo based blog\"
 199           :base-url \"https://www.site.com/\"
 200           :working-directory \"~/site/content/post/\"
 201           :online-suffix \".html\"
 202           :working-suffix \".md\"
 203           :rewrites ((\"\\(https://site.com/[0-9]+/[0-9]+/[0-9]+/\\)\" . \".md\")))))
 204
 205
 206    The last line tells `org-protocol-open-source' to open
 207    /home/user/org/index.php, if the URL cannot be mapped to an existing
 208    file, and ends with either \"org\" or \"org/\".
 209
 210 Consider using the interactive functions `org-protocol-create' and
 211 `org-protocol-create-for-org' to help you filling this variable with valid contents."
 212   :group 'org-protocol
 213   :type 'alist)
 214
 215 (defcustom org-protocol-protocol-alist nil
 216   "Register custom handlers for org-protocol.
 217
 218 Each element of this list must be of the form:
 219
 220   (module-name :protocol protocol :function func :kill-client nil)
 221
 222 protocol - protocol to detect in a filename without trailing
 223            colon and slashes.  See rfc1738 section 2.1 for more
 224            on this.  If you define a protocol \"my-protocol\",
 225            `org-protocol-check-filename-for-protocol' will search
 226            filenames for \"org-protocol:/my-protocol\" and
 227            trigger your action for every match.  `org-protocol'
 228            is defined in `org-protocol-the-protocol'.  Double and
 229            triple slashes are compressed to one by emacsclient.
 230
 231 function - function that handles requests with protocol and takes
 232            one argument.  If a new-style link (key=val&key2=val2)
 233            is given, the argument will be a property list with
 234            the values from the link.  If an old-style link is
 235            given (val1/val2), the argument will be the filename
 236            with all protocols stripped.
 237
 238            If the function returns nil, emacsclient and -server
 239            do nothing.  Any non-nil return value is considered a
 240            valid filename and thus passed to the server.
 241
 242            `org-protocol.el' provides some support for handling
 243            old-style filenames, if you follow the conventions
 244            used for the standard handlers in
 245            `org-protocol-protocol-alist-default'.  See
 246            `org-protocol-parse-parameters'.
 247
 248 kill-client - If t, kill the client immediately, once the sub-protocol is
 249            detected.  This is necessary for actions that can be interrupted by
 250            `C-g' to avoid dangling emacsclients.  Note that all other command
 251            line arguments but the this one will be discarded.  Greedy handlers
 252            still receive the whole list of arguments though.
 253
 254 Here is an example:
 255
 256   (setq org-protocol-protocol-alist
 257       \\='((\"my-protocol\"
 258          :protocol \"my-protocol\"
 259          :function my-protocol-handler-function)
 260         (\"your-protocol\"
 261          :protocol \"your-protocol\"
 262          :function your-protocol-handler-function)))"
 263   :group 'org-protocol
 264   :type '(alist))
 265
 266 (defcustom org-protocol-default-template-key nil
 267   "The default template key to use.
 268 This is usually a single character string but can also be a
 269 string with two characters."
 270   :group 'org-protocol
 271   :type '(choice (const nil) (string)))
 272
 273 (defcustom org-protocol-data-separator "/+\\|\\?"
 274   "The default data separator to use.
 275 This should be a single regexp string."
 276   :group 'org-protocol
 277   :version "24.4"
 278   :package-version '(Org . "8.0")
 279   :type 'string)
 280
 281 ;;; Helper functions:
 282
 283 (defun org-protocol-sanitize-uri (uri)
 284   "Sanitize slashes to double-slashes in URI.
 285 Emacsclient compresses double and triple slashes."
 286   (when (string-match "^\\([a-z]+\\):/" uri)
 287     (let* ((splitparts (split-string uri "/+")))
 288       (setq uri (concat (car splitparts) "//" (mapconcat 'identity (cdr splitparts) "/")))))
 289   uri)
 290
 291 (defun org-protocol-split-data (data &optional unhexify separator)
 292   "Split the DATA argument for an org-protocol handler function.
 293 If UNHEXIFY is non-nil, hex-decode each split part.  If UNHEXIFY
 294 is a function, use that function to decode each split part.  The
 295 string is split at each occurrence of SEPARATOR (regexp).  If no
 296 SEPARATOR is specified or SEPARATOR is nil, assume \"/+\".  The
 297 results of that splitting are returned as a list."
 298   (let* ((sep (or separator "/+\\|\\?"))
 299          (split-parts (split-string data sep)))
 300     (if unhexify
 301         (if (fboundp unhexify)
 302             (mapcar unhexify split-parts)
 303           (mapcar 'org-link-unescape split-parts))
 304       split-parts)))
 305
 306 (defun org-protocol-flatten-greedy (param-list &optional strip-path replacement)
 307   "Transform PARAM-LIST into a flat list for greedy handlers.
 308
 309 Greedy handlers might receive a list like this from emacsclient:
 310 \((\"/dir/org-protocol:/greedy:/~/path1\" (23 . 12)) (\"/dir/param\"))
 311 where \"/dir/\" is the absolute path to emacsclient's working directory.  This
 312 function transforms it into a flat list using `org-protocol-flatten' and
 313 transforms the elements of that list as follows:
 314
 315 If STRIP-PATH is non-nil, remove the \"/dir/\" prefix from all members of
 316 param-list.
 317
 318 If REPLACEMENT is string, replace the \"/dir/\" prefix with it.
 319
 320 The first parameter, the one that contains the protocols, is always changed.
 321 Everything up to the end of the protocols is stripped.
 322
 323 Note, that this function will always behave as if
 324 `org-protocol-reverse-list-of-files' was set to t and the returned list will
 325 reflect that.  emacsclient's first parameter will be the first one in the
 326 returned list."
 327   (let* ((l (org-protocol-flatten (if org-protocol-reverse-list-of-files
 328                                       param-list
 329                                     (reverse param-list))))
 330          (trigger (car l))
 331          (len 0)
 332          dir
 333          ret)
 334     (when (string-match "^\\(.*\\)\\(org-protocol:/+[a-zA-z0-9][-_a-zA-z0-9]*:/+\\)\\(.*\\)" trigger)
 335       (setq dir (match-string 1 trigger))
 336       (setq len (length dir))
 337       (setcar l (concat dir (match-string 3 trigger))))
 338     (if strip-path
 339         (progn
 340           (dolist (e l ret)
 341             (setq ret
 342                   (append ret
 343                           (list
 344                            (if (stringp e)
 345                                (if (stringp replacement)
 346                                    (setq e (concat replacement (substring e len)))
 347                                  (setq e (substring e len)))
 348                              e)))))
 349           ret)
 350       l)))
 351
 352 (defun org-protocol-flatten (list)
 353   "Transform LIST into a flat list.
 354
 355 Greedy handlers might receive a list like this from emacsclient:
 356 \((\"/dir/org-protocol:/greedy:/~/path1\" (23 . 12)) (\"/dir/param\"))
 357 where \"/dir/\" is the absolute path to emacsclients working directory.
 358 This function transforms it into a flat list."
 359   (if (null list) ()
 360     (if (listp list)
 361         (append (org-protocol-flatten (car list)) (org-protocol-flatten (cdr list)))
 362       (list list))))
 363
 364 (defun org-protocol-parse-parameters (info &optional new-style default-order)
 365   "Return a property list of parameters from INFO.
 366 If NEW-STYLE is non-nil, treat INFO as a query string (ex:
 367 url=URL&title=TITLE).  If old-style links are used (ex:
 368 org-protocol://store-link/url/title), assign them to attributes
 369 following DEFAULT-ORDER.
 370
 371 If no DEFAULT-ORDER is specified, return the list of values.
 372
 373 If INFO is already a property list, return it unchanged."
 374   (if (listp info)
 375       info
 376     (if new-style
 377         (let ((data (org-protocol-convert-query-to-plist info))
 378               result)
 379           (while data
 380             (setq result
 381                   (append
 382                    result
 383                    (list
 384                     (pop data)
 385                     (org-link-unescape (pop data))))))
 386           result)
 387       (let ((data (org-protocol-split-data info t org-protocol-data-separator)))
 388         (if default-order
 389             (org-protocol-assign-parameters data default-order)
 390           data)))))
 391
 392 (defun org-protocol-assign-parameters (data default-order)
 393   "Return a property list of parameters from DATA.
 394 Key names are taken from DEFAULT-ORDER, which should be a list of
 395 symbols.  If DEFAULT-ORDER is shorter than the number of values
 396 specified, the rest of the values are treated as :key value pairs."
 397   (let (result)
 398     (while default-order
 399       (setq result
 400             (append result
 401                     (list (pop default-order)
 402                           (pop data)))))
 403     (while data
 404       (setq result
 405             (append result
 406                     (list (intern (concat ":" (pop data)))
 407                           (pop data)))))
 408     result))
 409
 410 ;;; Standard protocol handlers:
 411
 412 (defun org-protocol-store-link (fname)
 413   "Process an org-protocol://store-link style url.
 414 Additionally store a browser URL as an org link.  Also pushes the
 415 link's URL to the `kill-ring'.
 416
 417 Parameters: url, title (optional), body (optional)
 418
 419 Old-style links such as org-protocol://store-link://URL/TITLE are
 420 also recognized.
 421
 422 The location for a browser's bookmark has to look like this:
 423
 424   javascript:location.href = \\
 425       \\='org-protocol://store-link?url=\\=' + \\
 426       encodeURIComponent(location.href) + \\='&title=\\=' + \\
 427       encodeURIComponent(document.title);
 428
 429 Don't use `escape()'!  Use `encodeURIComponent()' instead.  The
 430 title of the page could contain slashes and the location
 431 definitely will.
 432
 433 The sub-protocol used to reach this function is set in
 434 `org-protocol-protocol-alist'.
 435
 436 FNAME should be a property list.  If not, an old-style link of the
 437 form URL/TITLE can also be used."
 438   (let* ((splitparts (org-protocol-parse-parameters fname nil '(:url :title)))
 439          (uri (org-protocol-sanitize-uri (plist-get splitparts :url)))
 440          (title (plist-get splitparts :title)))
 441     (when (boundp 'org-stored-links)
 442       (push (list uri title) org-stored-links))
 443     (kill-new uri)
 444     (message "`%s' to insert new org-link, `%s' to insert `%s'"
 445              (substitute-command-keys "`\\[org-insert-link]'")
 446              (substitute-command-keys "`\\[yank]'")
 447              uri))
 448   nil)
 449
 450 (defun org-protocol-capture (info)
 451   "Process an org-protocol://capture style url with INFO.
 452
 453 The sub-protocol used to reach this function is set in
 454 `org-protocol-protocol-alist'.
 455
 456 This function detects an URL, title and optional text, separated
 457 by `/'.  The location for a browser's bookmark looks like this:
 458
 459   javascript:location.href = \\='org-protocol://capture?url=\\='+ \\
 460         encodeURIComponent(location.href) + \\='&title=\\=' \\
 461         encodeURIComponent(document.title) + \\='&body=\\=' + \\
 462         encodeURIComponent(window.getSelection())
 463
 464 By default, it uses the character `org-protocol-default-template-key',
 465 which should be associated with a template in `org-capture-templates'.
 466 You may specify the template with a template= query parameter, like this:
 467
 468   javascript:location.href = \\='org-protocol://capture?template=b\\='+ ...
 469
 470 Now template ?b will be used."
 471   (when (and (boundp 'org-stored-links)
 472              (org-protocol-do-capture info))
 473     (message "Item captured."))
 474   nil)
 475
 476 (defun org-protocol-convert-query-to-plist (query)
 477   "Convert QUERY key=value pairs in the URL to a property list."
 478   (when query
 479     (apply 'append (mapcar (lambda (x)
 480                              (let ((c (split-string x "=")))
 481                                (list (intern (concat ":" (car c))) (cadr c))))
 482                            (split-string query "&")))))
 483
 484 (defvar org-capture-templates)
 485 (defun org-protocol-do-capture (info)
 486   "Perform the actual capture based on INFO."
 487   (let* ((temp-parts (org-protocol-parse-parameters info))
 488          (parts
 489           (cond
 490            ((and (listp info) (symbolp (car info))) info)
 491            ((= (length (car temp-parts)) 1) ;; First parameter is exactly one character long
 492             (org-protocol-assign-parameters temp-parts '(:template :url :title :body)))
 493            (t
 494             (org-protocol-assign-parameters temp-parts '(:url :title :body)))))
 495          (template (or (plist-get parts :template)
 496                        org-protocol-default-template-key))
 497          (url (and (plist-get parts :url) (org-protocol-sanitize-uri (plist-get parts :url))))
 498          (type (and url (string-match "^\\([a-z]+\\):" url) (match-string 1 url)))
 499          (title (or (plist-get parts :title) ""))
 500          (region (or (plist-get parts :body) ""))
 501          (orglink (if url
 502                       (org-make-link-string
 503                        url (if (string-match "[^[:space:]]" title) title url))
 504                     title))
 505          (org-capture-link-is-already-stored t)) ;; avoid call to org-store-link
 506     (setq org-stored-links
 507           (cons (list url title) org-stored-links))
 508     (org-store-link-props :type type
 509                           :link url
 510                           :description title
 511                           :annotation orglink
 512                           :initial region
 513                           :query parts)
 514     (raise-frame)
 515     (funcall 'org-capture nil template)))
 516
 517 (defun org-protocol-open-source (fname)
 518   "Process an org-protocol://open-source?url= style URL with FNAME.
 519
 520 Change a filename by mapping URLs to local filenames as set
 521 in `org-protocol-project-alist'.
 522
 523 The location for a browser's bookmark should look like this:
 524
 525   javascript:location.href = \\='org-protocol://open-source?url=\\=' + \\
 526         encodeURIComponent(location.href)"
 527   ;; As we enter this function for a match on our protocol, the return value
 528   ;; defaults to nil.
 529   (let ((result nil)
 530         (f (org-protocol-sanitize-uri
 531             (plist-get (org-protocol-parse-parameters fname nil '(:url))
 532                        :url))))
 533     (catch 'result
 534       (dolist (prolist org-protocol-project-alist)
 535         (let* ((base-url (plist-get (cdr prolist) :base-url))
 536                (wsearch (regexp-quote base-url)))
 537
 538           (when (string-match wsearch f)
 539             (let* ((wdir (plist-get (cdr prolist) :working-directory))
 540                    (strip-suffix (plist-get (cdr prolist) :online-suffix))
 541                    (add-suffix (plist-get (cdr prolist) :working-suffix))
 542                    ;; Strip "[?#].*$" if `f' is a redirect with another
 543                    ;; ending than strip-suffix here:
 544                    (f1 (substring f 0 (string-match "\\([\\?#].*\\)?$" f)))
 545                    (start-pos (+ (string-match wsearch f1) (length base-url)))
 546                    (end-pos (string-match
 547                              (regexp-quote strip-suffix) f1))
 548                    ;; We have to compare redirects without suffix below:
 549                    (f2 (concat wdir (substring f1 start-pos end-pos)))
 550                    (the-file (concat f2 add-suffix)))
 551
 552               ;; Note: the-file may still contain `%C3' et al here because browsers
 553               ;; tend to encode `&auml;' in URLs to `%25C3' - `%25' being `%'.
 554               ;; So the results may vary.
 555
 556               ;; -- start redirects --
 557               (unless (file-exists-p the-file)
 558                 (message "File %s does not exist.\nTesting for rewritten URLs." the-file)
 559                 (let ((rewrites (plist-get (cdr prolist) :rewrites)))
 560                   (when rewrites
 561                     (message "Rewrites found: %S" rewrites)
 562                     (dolist (rewrite rewrites)
 563                       ;; Try to match a rewritten URL and map it to
 564                       ;; a real file.  Compare redirects without
 565                       ;; suffix.
 566                       (when (string-match (car rewrite) f1)
 567                         (let ((replacement
 568                                (concat (directory-file-name
 569                                         (replace-match "" nil nil f1 1))
 570                                        (cdr rewrite))))
 571                           (throw 'result (concat wdir replacement))))))))
 572               ;; -- end of redirects --
 573
 574               (if (file-readable-p the-file)
 575                   (throw 'result the-file))
 576               (if (file-exists-p the-file)
 577                   (message "%s: permission denied!" the-file)
 578                 (message "%s: no such file or directory." the-file))))))
 579       result)))
 580
 581
 582 ;;; Core functions:
 583
 584 (defun org-protocol-check-filename-for-protocol (fname restoffiles _client)
 585   "Check if `org-protocol-the-protocol' and a valid protocol are used in FNAME.
 586 Sub-protocols are registered in `org-protocol-protocol-alist' and
 587 `org-protocol-protocol-alist-default'.  This is how the matching is done:
 588
 589   (string-match \"protocol:/+sub-protocol\\\\(://\\\\|\\\\?\\\\)\" ...)
 590
 591 protocol and sub-protocol are regexp-quoted.
 592
 593 Old-style links such as \"protocol://sub-protocol://param1/param2\" are
 594 also recognized.
 595
 596 If a matching protocol is found, the protocol is stripped from
 597 fname and the result is passed to the protocol function as the
 598 first parameter.  The second parameter will be non-nil if FNAME
 599 uses key=val&key2=val2-type arguments, or nil if FNAME uses
 600 val/val2-type arguments.  If the function returns nil, the
 601 filename is removed from the list of filenames passed from
 602 emacsclient to the server.  If the function returns a non-nil
 603 value, that value is passed to the server as filename.
 604
 605 If the handler function is greedy, RESTOFFILES will also be passed to it.
 606
 607 CLIENT is ignored."
 608   (let ((sub-protocols (append org-protocol-protocol-alist
 609                                org-protocol-protocol-alist-default)))
 610     (catch 'fname
 611       (let ((the-protocol (concat (regexp-quote org-protocol-the-protocol)
 612                                   ":/+")))
 613         (when (string-match the-protocol fname)
 614           (dolist (prolist sub-protocols)
 615             (let ((proto
 616                    (concat the-protocol
 617                            (regexp-quote (plist-get (cdr prolist) :protocol))
 618                            "\\(:/+\\|\\?\\)")))
 619               (when (string-match proto fname)
 620                 (let* ((func (plist-get (cdr prolist) :function))
 621                        (greedy (plist-get (cdr prolist) :greedy))
 622                        (split (split-string fname proto))
 623                        (result (if greedy restoffiles (cadr split)))
 624                        (new-style (string= (match-string 1 fname) "?")))
 625                   (when (plist-get (cdr prolist) :kill-client)
 626                     (message "Greedy org-protocol handler.  Killing client.")
 627                     (server-edit))
 628                   (when (fboundp func)
 629                     (unless greedy
 630                       (throw 'fname
 631                              (if new-style
 632                                  (funcall func (org-protocol-parse-parameters
 633                                                 result new-style))
 634                                (warn "Please update your Org Protocol handler \
 635 to deal with new-style links.")
 636                                (funcall func result))))
 637                     ;; Greedy protocol handlers are responsible for
 638                     ;; parsing their own filenames.
 639                     (funcall func result)
 640                     (throw 'fname t))))))))
 641       fname)))
 642
 643 (defadvice server-visit-files (before org-protocol-detect-protocol-server activate)
 644   "Advice server-visit-flist to call `org-protocol-modify-filename-for-protocol'."
 645   (let ((flist (if org-protocol-reverse-list-of-files
 646                    (reverse  (ad-get-arg 0))
 647                  (ad-get-arg 0)))
 648         (client (ad-get-arg 1)))
 649     (catch 'greedy
 650       (dolist (var flist)
 651         ;; `\' to `/' on windows.  FIXME: could this be done any better?
 652         (let ((fname  (expand-file-name (car var))))
 653           (setq fname (org-protocol-check-filename-for-protocol
 654                        fname (member var flist)  client))
 655           (if (eq fname t) ;; greedy? We need the t return value.
 656               (progn
 657                 (ad-set-arg 0 nil)
 658                 (throw 'greedy t))
 659             (if (stringp fname) ;; probably filename
 660                 (setcar var fname)
 661               (ad-set-arg 0 (delq var (ad-get-arg 0))))))))))
 662
 663 ;;; Org specific functions:
 664
 665 (defun org-protocol-create-for-org ()
 666   "Create an Org protocol project for the current file's project.
 667 The visited file needs to be part of a publishing project in
 668 `org-publish-project-alist' for this to work.  The function
 669 delegates most of the work to `org-protocol-create'."
 670   (interactive)
 671   (require 'ox-publish)
 672   (let ((all (or (org-publish-get-project-from-filename buffer-file-name))))
 673     (if all (org-protocol-create (cdr all))
 674       (message "%s"
 675                (substitute-command-keys
 676                 "Not in an Org project.  \
 677 Did you mean `\\[org-protocol-create]'?")))))
 678
 679 (defun org-protocol-create (&optional project-plist)
 680   "Create a new org-protocol project interactively.
 681 An org-protocol project is an entry in
 682 `org-protocol-project-alist' which is used by
 683 `org-protocol-open-source'.  Optionally use PROJECT-PLIST to
 684 initialize the defaults for this project.  If PROJECT-PLIST is
 685 the cdr of an element in `org-publish-project-alist', reuse
 686 :base-directory, :html-extension and :base-extension."
 687   (interactive)
 688   (let ((working-dir (expand-file-name
 689                       (or (plist-get project-plist :base-directory)
 690                           default-directory)))
 691         (base-url "https://orgmode.org/worg/")
 692         (strip-suffix (or (plist-get project-plist :html-extension) ".html"))
 693         (working-suffix (if (plist-get project-plist :base-extension)
 694                             (concat "." (plist-get project-plist :base-extension))
 695                           ".org"))
 696         (insert-default-directory t)
 697         (minibuffer-allow-text-properties nil))
 698
 699     (setq base-url (read-string "Base URL of published content: " base-url nil base-url t))
 700     (or (string-suffix-p "/" base-url)
 701         (setq base-url (concat base-url "/")))
 702
 703     (setq working-dir
 704           (expand-file-name
 705            (read-directory-name "Local working directory: " working-dir working-dir t)))
 706     (or (string-suffix-p "/" working-dir)
 707         (setq working-dir (concat working-dir "/")))
 708
 709     (setq strip-suffix
 710           (read-string
 711            (concat "Extension to strip from published URLs (" strip-suffix "): ")
 712            strip-suffix nil strip-suffix t))
 713
 714     (setq working-suffix
 715           (read-string
 716            (concat "Extension of editable files (" working-suffix "): ")
 717            working-suffix nil working-suffix t))
 718
 719     (when (yes-or-no-p "Save the new org-protocol-project to your init file? ")
 720       (setq org-protocol-project-alist
 721             (cons `(,base-url . (:base-url ,base-url
 722                                            :working-directory ,working-dir
 723                                            :online-suffix ,strip-suffix
 724                                            :working-suffix ,working-suffix))
 725                   org-protocol-project-alist))
 726       (customize-save-variable 'org-protocol-project-alist org-protocol-project-alist))))
 727
 728 (provide 'org-protocol)
 729
 730 ;;; org-protocol.el ends here