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+;;; gntp.el --- Growl Notification Protocol for Emacs -*- lexical-binding: t -*-
+
+;; Author: Engelke Eschner <tekai@gmx.li>
+;; Version: 0.1
+;; Package-Version: 20141024.1950
+;; Created: 2013-03-21
+
+;; LICENSE
+;; Copyright (c) 2013 Engelke Eschner
+;; All rights reserved.
+
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions
+;; are met:
+;;     * Redistributions of source code must retain the above copyright
+;;       notice, this list of conditions and the following disclaimer.
+;;     * Redistributions in binary form must reproduce the above
+;;       copyright notice, this list of conditions and the following
+;;       disclaimer in the documentation and/or other materials provided
+;;       with the distribution.
+;;     * Neither the name of the gntp.el nor the names of its
+;;       contributors may be used to endorse or promote products derived
+;;       from this software without specific prior written permission.
+
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
+;; HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+;; OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+;;; Commentary:
+;; This package implements the Growl Notification Protocol GNTP
+;; described at http://www.growlforwindows.com/gfw/help/gntp.aspx
+;; It is incomplete as it only lets you send but not receive
+;; notifications.
+
+;;; Code:
+
+(defgroup gntp nil
+  "GNTP, send/register growl notifications via GNTP from within emacs."
+  :group 'external)
+
+(defcustom gntp-application-name "Emacs/gntp.el"
+  "Name of the application gntp registers itself."
+  :type '(string))
+
+(defcustom gntp-application-icon nil
+  "Icon to display as the application icon.
+Either a URL or a path to a file."
+  :type '(string))
+
+(defcustom gntp-server "localhost"
+  "Default port of the server.
+Standard says can't be changed, but port-forwarding etc."
+  :type '(string))
+
+(defcustom gntp-server-port 23053
+  "Default port of the server.
+Standard says can't be changed, but port-forwarding etc."
+  :type '(integer))
+
+(defcustom gntp-register-alist nil
+  "Registration item list."
+  :type '(choice string (const nil)))
+
+(defun gntp-register (&optional notifications server  port)
+  (interactive)
+  "Register NOTIFICATIONS at SERVER:PORT.
+PORT defaults to `gntp-server-port'."
+  (let ((message (gntp-build-message-register (if notifications notifications gntp-register-alist))))
+    (gntp-send message (if server server gntp-server) port)))
+
+;;;###autoload
+(defun gntp-notify (name title text server &optional port priority icon)
+  "Send notification NAME with TITLE, TEXT, PRIORITY and ICON to SERVER:PORT.
+PORT defaults to `gntp-server-port'"
+  (let ((message (gntp-build-message-notify name title text priority icon)))
+    (gntp-send message server port)))
+
+(defun gntp-build-message-register (notifications)
+  "Build the message to register NOTIFICATIONS types."
+  (let ((lines (list "GNTP/1.0 REGISTER NONE"
+                     (format "Application-Name: %s"
+                             gntp-application-name)
+                     (format "Notifications-Count: %d"
+                             (length notifications))))
+        (icon-uri (gntp-app-icon-uri))
+        (icon-data (gntp-app-icon-data))
+        (icons (list)))
+
+    ;; append icon uri
+    (when icon-uri
+      (nconc lines (list (format "Application-Icon: %s" icon-uri)))
+      ;; and data when it exists
+      (when icon-data
+        (setq icons (cons icon-data icons))))
+
+    (dolist (notice notifications)
+      ;; "For each notification being registered:
+      ;; Each notification being registered should be seperated by a
+      ;; blank line, including the first notification
+      (nconc lines (cons "" (gntp-notification-lines notice)))
+      ;; c
+      (let ((icon (gntp-notice-icon-data notice)))
+        (when icon
+          (nconc icons (list "" icon)))))
+
+    ;; icon data must come last
+    (when icons
+      (nconc lines (cons "" icons)))
+
+    (mapconcat 'identity (remove nil lines) "\r\n")))
+
+(defun gntp-notification-lines (notice)
+  "Transform NOTICE into a list of strings."
+  (let ((display-name (gntp-notice-get notice :display))
+        (enabled (gntp-notice-get notice :enabled))
+        (icon-uri (gntp-notice-icon-uri notice)))
+  (list
+   ;; Required - The name (type) of the notification being registered
+   (concat "Notification-Name: " (gntp-notice-name notice))
+   ;; Optional - The name of the notification that is displayed to
+   ;; the user (defaults to the same value as Notification-Name)
+   (when display-name
+     (concat "Notification-Display-Name: " display-name))
+   ;; Optional - Indicates if the notification should be enabled by
+   ;; default (defaults to False)
+   (when enabled
+     "Notification-Enabled: True")
+   ;; Optional - The default icon to use for notifications of this type
+   (when icon-uri
+     (concat "Notification-Icon: " icon-uri)))))
+
+(defun gntp-build-message-notify (name title text &optional priority icon)
+  "Build a message of type NAME with TITLE and TEXT."
+
+  (format
+   "GNTP/1.0 NOTIFY NONE\r\n\
+Application-Name: %s\r\n\
+Notification-Name: %s\r\n\
+Notification-Title: %s\r\n\
+Notification-Text: %s\r\n\
+Notification-Priority: %s\r\n\
+Notification-Icon: %s\r\n\
+\r\n"
+          gntp-application-name
+          (if (symbolp name) (symbol-name name) name)
+          title
+          ;; no CRLF in the text to avoid accidentel msg end
+          (replace-regexp-in-string "\r\n" "\n" text)
+          (if priority priority "0")
+          (if icon (gntp-icon-uri icon) "")))
+
+;; notice
+;;(list name ; everthing else is optional
+;;      :display "name to display"
+;;      :enabled nil
+;;      :icon "url or file")
+
+
+(defun gntp-notice-icon-uri (notice)
+  "Get the icon URI from NOTICE."
+  (gntp-icon-uri (gntp-notice-get notice :icon)))
+
+(defun gntp-notice-icon-data (notice)
+  "Get icon data from NOTICE."
+  (gntp-icon-data (gntp-notice-get notice :icon)))
+
+(defun gntp-app-icon-uri ()
+  "Return the value to be used in the Application-Icon header."
+  (gntp-icon-uri gntp-application-icon))
+
+(defun gntp-app-icon-data ()
+  "Return the value to be used in the Application-Icon header."
+  (gntp-icon-data gntp-application-icon))
+
+(defun gntp-icon-uri (icon)
+  "Get the URI of ICON."
+  (when icon
+    (cond ((string-equal (substring icon 0 7) "http://") icon)
+          ((and (file-exists-p icon) (file-readable-p icon))
+           (concat "x-growl-resource://" (md5 icon))))))
+
+(defun gntp-icon-data (icon)
+  "Get the URI of ICON."
+  (when (and icon (not (string-equal (substring icon 0 7) "http://"))
+             (file-exists-p icon) (file-readable-p icon))
+    (let ((id (md5 icon))
+          (data (gntp-file-string icon)))
+      (format "Identifier: %s\r\nLength: %d\r\n\r\n%s"
+              id (length data) data))))
+
+(defun gntp-notice-name (notice)
+  "Get the name of NOTICE.  The name must be either a symbol or string."
+  (let ((name (car notice)))
+    (if (symbolp name)
+        (symbol-name name)
+      name)))
+
+(defun gntp-notice-get (notice property)
+  "Get PROPERTY from NOTICE."
+  (plist-get (cdr notice) property))
+
+(defun gntp-send (message server &optional port)
+  "Send MESSAGE to SERVER:PORT.  PORT defaults to `gntp-server-port'."
+  (let ((proc (make-network-process
+               :name "gntp"
+               :host server
+               :server nil
+               :service (if port port gntp-server-port)
+               ;;:sentinel 'gntp-sentinel
+               :filter 'gntp-filter)))
+    ;; hmm one CRLF too much?
+    (process-send-string proc (concat message "\r\n\r\n\r\n"))))
+
+(defun gntp-filter (proc string)
+  "Filter for PROC started by `gntp-send'.
+Argument STRING reply from the server."
+  (when (string-equal "GNTP/1.0 -ERROR" (substring string 0 15))
+    (error "GNTP: Something went wrong take a look at the reply:\n %s"
+           string)))
+
+;; (defun gntp-sentinel (proc msg)
+;;   (when (string= msg "connection broken by remote peer\n")
+;;     (message (format "client %s has quit" proc))))
+
+
+(defun gntp-file-string (file)
+  "Read the contents of a FILE and return as a string."
+  (with-temp-buffer
+    (insert-file-contents-literally file)
+    (buffer-string)))
+
+(provide 'gntp)
+
+;;; gntp.el ends here