org-capture-server/edit_server.el

;;
;; Emacs edit-server
;;
;; This provides an edit server to respond to requests from the Chrome
;; Emacs Chrome plugin. Based on
;; http://www.emacswiki.org/emacs/EmacsEchoServer to start with.
;;
;; (C) 2009 Alex Bennee (alex@bennee.com)
;; Licensed under GPLv3
;;
;;

(defvar edit-server-port 9292
  "Port the edit server listens too")

(defvar edit-server-clients '() 
  "alist where KEY is a client process and VALUE is the string")

(defvar edit-server-current-proc 'nil
  "Network process associated with the current edit, made local when
  the edit buffer is create")

(defun edit-server-start nil
  "Start the edit server"
  (interactive)
  (unless (process-status "edit-server")
    (make-network-process
     :name "edit-server"
     :buffer "*edit-server*"
     :family 'ipv4
     :host 'local ; only listen to local connections
     :service edit-server-port
     :filter 'edit-server-filter
     :server 't) 
    (setq edit-server-clients '())))

(defun edit-server-stop nil
  "Stop the edit server"
  (interactive)
  (while edit-server-clients
    (delete-process (car (car edit-server-clients)))
    (setq edit-server-clients (cdr edit-server-clients)))
  (delete-process "edit-server"))


(defun edit-server-filter (proc string)
  "Called each time something connects to the edit server"
  (message (format "edit-server-filter: got %s" string))
  (let ((pending (assoc proc edit-server-clients))
        message
        index)
    ;;create entry if required
    (unless pending
      (setq edir-server-clients (cons (cons proc "") edit-server-clients))
      (setq pending  (assoc proc edit-server-clients)))

    ;;Get the content from the headers, we don't actually much care
    ;;about the headers for now. I suspect this would break on Windows
    (let ((content (cdr (split-string http "
\n
\n"))))
      (edit-server-create-edit-buffer proc content))))

(defun edit-server-create-edit-buffer(proc string)
  "Create an edit buffer, place content in it and setup the call
backs"
  (switch-to-buffer "edit-text-buffer")
  (insert 'string)
  (set (make-variable-buffer-local edit-server-current-proc) proc)
  (local-set-key (kbd "C-x k") 'edit-server-done)
  (local-set-key ((kbd "C-x C-s") 'edit-server-done)))

;
; HTTP/1.0 200 OK
; Server: BaseHTTP/0.3 Python/2.6.4
; Date: Fri, 18 Dec 2009 19:00:28 GMT
; 
; This is a test
; For the text
;

(defun edit-server-done()
  "Once someone is done with editing their text edit-server-done is
  called and the response is sent back to the browser"
  (interactive)
  (message "edit-server-done")
  (let (proc edit-server-current-proc)
    (process-send-string proc "HTTP/1.0 200 OK
\n")
    (process-send-string proc "Server: Emacs
\n")
    (process-send-string proc "
\n")
    (process-send-string proc (buffer-string))))
    

(defun edit-server-sentinel (proc msg)
  (delq proc edit-server-clients)
  (message (format "client %s has quit" proc)))