lisp/ol-irc.el

   1 ;;; ol-irc.el --- Links to IRC Sessions              -*- lexical-binding: t; -*-
   2 ;;
   3 ;; Copyright (C) 2008-2019 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Philip Jackson <emacs@shellarchive.co.uk>
   6 ;; Keywords: erc, irc, link, org
   7 ;;
   8 ;; This file is part of GNU Emacs.
   9 ;;
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; This file implements links to an IRC session from within Org mode.
  26 ;; Org mode loads this module by default - if this is not what you want,
  27 ;; configure the variable `org-modules'.
  28 ;;
  29 ;; Please customize the variable `org-modules' to select
  30 ;; extensions you would like to use, and to deselect those which you don't
  31 ;; want.
  32 ;;
  33 ;; Please note that at the moment only ERC is supported.  Other clients
  34 ;; shouldn't be difficult to add though.
  35 ;;
  36 ;; Then set `org-irc-link-to-logs' to non-nil if you would like a
  37 ;; file:/ type link to be created to the current line in the logs or
  38 ;; to t if you would like to create an irc:/ style link.
  39 ;;
  40 ;; Links within an org buffer might look like this:
  41 ;;
  42 ;; [[irc:/irc.freenode.net/#emacs/bob][chat with bob in #emacs on freenode]]
  43 ;; [[irc:/irc.freenode.net/#emacs][#emacs on freenode]]
  44 ;; [[irc:/irc.freenode.net/]]
  45 ;;
  46 ;; If, when the resulting link is visited, there is no connection to a
  47 ;; requested server then one will be created.
  48
  49 ;;; Code:
  50
  51 (require 'ol)
  52
  53 (declare-function erc-buffer-filter "erc" (predicate &optional proc))
  54 (declare-function erc-channel-p "erc" (channel))
  55 (declare-function erc-cmd-JOIN "erc" (channel &optional key))
  56 (declare-function erc-current-logfile "erc-log" (&optional buffer))
  57 (declare-function erc-default-target "erc" ())
  58 (declare-function erc-get-server-nickname-list "erc" ())
  59 (declare-function erc-logging-enabled "erc-log" (&optional buffer))
  60 (declare-function erc-prompt "erc" ())
  61 (declare-function erc-save-buffer-in-logs "erc-log" (&optional buffer))
  62 (declare-function erc-server-buffer "erc" ())
  63
  64 (defvar org-irc-client 'erc
  65   "The IRC client to act on.")
  66
  67 (defvar org-irc-link-to-logs nil
  68   "Non-nil will store a link to the logs, nil will store an irc: style link.")
  69
  70 (defvar erc-default-port)   ; dynamically scoped from erc.el
  71 (defvar erc-session-port)   ; dynamically scoped form erc-backend.el
  72 (defvar erc-session-server) ; dynamically scoped form erc-backend.el
  73
  74 ;; Generic functions/config (extend these for other clients)
  75
  76 (org-link-set-parameters "irc"
  77                          :follow #'org-irc-visit
  78                          :store #'org-irc-store-link
  79                          :export #'org-irc-export)
  80
  81 (defun org-irc-visit (link)
  82   "Parse LINK and dispatch to the correct function based on the client found."
  83   (let ((link (org-irc-parse-link link)))
  84     (cond
  85      ((eq org-irc-client 'erc)
  86       (org-irc-visit-erc link))
  87      (t
  88       (error "ERC only known client")))))
  89
  90 (defun org-irc-parse-link (link)
  91   "Parse an IRC LINK and return the attributes found.
  92 Parse a LINK that looks like server:port/chan/user (port, chan
  93 and user being optional) and return any of the port, channel or user
  94 attributes that are found."
  95   (let* ((parts (split-string link "/" t))
  96          (len (length parts)))
  97     (when (or (< len 1) (> len 3))
  98       (error "Failed to parse link needed 1-3 parts, got %d" len))
  99     (setcar parts (split-string (car parts) ":" t))
 100     parts))
 101
 102 ;;;###autoload
 103 (defun org-irc-store-link ()
 104   "Dispatch to the appropriate function to store a link to an IRC session."
 105   (cond
 106    ((eq major-mode 'erc-mode)
 107     (org-irc-erc-store-link))))
 108
 109 (defun org-irc-ellipsify-description (string &optional after)
 110   "Remove unnecessary white space from STRING and add ellipses if necessary.
 111 Strip starting and ending white space from STRING and replace any
 112 chars that the value AFTER with `...'"
 113   (let* ((after (number-to-string (or after 30)))
 114          (replace-map (list (cons "^[ \t]*" "")
 115                             (cons "[ \t]*$" "")
 116                             (cons (concat "^\\(.\\{" after
 117                                           "\\}\\).*") "\\1..."))))
 118     (dolist (x replace-map string)
 119       (when (string-match (car x) string)
 120         (setq string (replace-match (cdr x) nil nil string))))))
 121
 122 ;; ERC specific functions
 123
 124 (defun org-irc-erc-get-line-from-log (erc-line)
 125   "Find the best line to link to from the ERC logs given ERC-LINE as a start.
 126 If the user is on the ERC-prompt then search backward for the
 127 first non-blank line, otherwise return the current line.  The
 128 result is a cons of the filename and search string."
 129   (erc-save-buffer-in-logs)
 130   (require 'erc-log)
 131   (with-current-buffer (find-file-noselect (erc-current-logfile))
 132     (goto-char (point-max))
 133     (list
 134      (abbreviate-file-name buffer-file-name)
 135      ;; can we get a '::' part?
 136      (if (string= erc-line (erc-prompt))
 137          (progn
 138            (goto-char (point-at-bol))
 139            (when (search-backward-regexp "^[^   ]" nil t)
 140              (buffer-substring-no-properties (point-at-bol)
 141                                              (point-at-eol))))
 142        (when (search-backward erc-line nil t)
 143          (buffer-substring-no-properties (point-at-bol)
 144                                          (point-at-eol)))))))
 145
 146 (defun org-irc-erc-store-link ()
 147   "Store a link to the IRC log file or the session itself.
 148 Depending on the variable `org-irc-link-to-logs' store either a
 149 link to the log file for the current session or an irc: link to
 150 the session itself."
 151   (require 'erc-log)
 152   (if org-irc-link-to-logs
 153       (let* ((erc-line (buffer-substring-no-properties
 154                         (point-at-bol) (point-at-eol)))
 155              (parsed-line (org-irc-erc-get-line-from-log erc-line)))
 156         (if (erc-logging-enabled nil)
 157             (progn
 158               (org-link-store-props
 159                :type "file"
 160                :description (concat "'" (org-irc-ellipsify-description
 161                                          (cadr parsed-line) 20)
 162                                     "' from an IRC conversation")
 163                :link (concat "file:" (car parsed-line) "::"
 164                              (cadr parsed-line)))
 165               t)
 166           (error "This ERC session is not being logged")))
 167     (let* ((link-text (org-irc-get-erc-link))
 168            (link (org-irc-parse-link link-text)))
 169       (if link-text
 170           (progn
 171             (org-link-store-props
 172              :type "irc"
 173              :link (concat "irc:/" link-text)
 174              :description (concat "irc session `" link-text "'")
 175              :server (car (car link))
 176              :port (or (string-to-number (cadr (pop link))) erc-default-port)
 177              :nick (pop link))
 178             t)
 179         (error "Failed to create ('irc:/' style) ERC link")))))
 180
 181 (defun org-irc-get-erc-link ()
 182   "Return an org compatible irc:/ link from an ERC buffer."
 183   (let* ((session-port (if (numberp erc-session-port)
 184                            (number-to-string erc-session-port)
 185                          erc-session-port))
 186          (link (concat erc-session-server ":" session-port)))
 187     (concat link "/"
 188             (if (and (erc-default-target)
 189                      (erc-channel-p (erc-default-target))
 190                      (car (get-text-property (point) 'erc-data)))
 191                 ;; we can get a nick
 192                 (let ((nick (car (get-text-property (point) 'erc-data))))
 193                   (concat (erc-default-target) "/" nick))
 194               (erc-default-target)))))
 195
 196 (defun org-irc-get-current-erc-port ()
 197   "Return the current port as a number.
 198 Return the current port number or, if none is set, return the ERC
 199 default."
 200   (cond
 201    ((stringp erc-session-port)
 202     (string-to-number erc-session-port))
 203    ((numberp erc-session-port)
 204     erc-session-port)
 205    (t
 206     erc-default-port)))
 207
 208 (defun org-irc-visit-erc (link)
 209   "Visit an ERC buffer based on criteria found in LINK."
 210   (require 'erc)
 211   (require 'erc-log)
 212   (let* ((server (car (car link)))
 213          (port (let ((p (cadr (pop link))))
 214                  (if p (string-to-number p) erc-default-port)))
 215          (server-buffer)
 216          (buffer-list
 217           (erc-buffer-filter
 218            (lambda nil
 219              (let ((tmp-server-buf (erc-server-buffer)))
 220                (and tmp-server-buf
 221                     (with-current-buffer tmp-server-buf
 222                       (and
 223                        (eq (org-irc-get-current-erc-port) port)
 224                        (string= erc-session-server server)
 225                        (setq server-buffer tmp-server-buf)))))))))
 226     (if buffer-list
 227         (let ((chan-name (pop link)))
 228           ;; if we got a channel name then switch to it or join it
 229           (if chan-name
 230               (let ((chan-buf (catch 'found
 231                                 (dolist (x buffer-list)
 232                                   (if (string= (buffer-name x) chan-name)
 233                                       (throw 'found x))))))
 234                 (if chan-buf
 235                     (progn
 236                       (pop-to-buffer-same-window chan-buf)
 237                       ;; if we got a nick, and they're in the chan,
 238                       ;; then start a chat with them
 239                       (let ((nick (pop link)))
 240                         (when nick
 241                           (if (member nick (erc-get-server-nickname-list))
 242                               (progn
 243                                 (goto-char (point-max))
 244                                 (insert (concat nick ": ")))
 245                             (error "%s not found in %s" nick chan-name)))))
 246                   (progn
 247                     (pop-to-buffer-same-window server-buffer)
 248                     (erc-cmd-JOIN chan-name))))
 249             (pop-to-buffer-same-window server-buffer)))
 250       ;; no server match, make new connection
 251       (erc-select :server server :port port))))
 252
 253 (defun org-irc-export (link description format)
 254   "Export an IRC link.
 255 See `org-link-parameters' for details about LINK, DESCRIPTION and
 256 FORMAT."
 257   (let ((desc (or description link)))
 258     (pcase format
 259       (`html (format "<a href=\"irc:%s\">%s</a>" link desc))
 260       (`md (format "[%s](irc:%s)" desc link))
 261       (_ nil))))
 262
 263 (provide 'ol-irc)
 264
 265 ;; Local variables:
 266 ;; generated-autoload-file: "org-loaddefs.el"
 267 ;; End:
 268
 269 ;;; ol-irc.el ends here