First minimal working version

Minimal working example with customisation variables and a way to post a
region or a buffer to twister. It's a start.

twister.el

@@ -0,0 +1,119 @@
+;;; twister.el --- A client for the twister distribute microblogging system
+
+;; Copyright (C) 2014 Marcel van der Boom <marcel@hsdev.com>
+
+;;; Commentary:
+;; The original idea for this client was to minimally implement:
+;; - make it possible to post to twister directly from Emacs;
+;; - have autocompletion for 'known users' when posting a message
+;;   (this probably means defining a 'mode'
+
+;; During the implementation of the above the following nice-to-have
+;; came to mind:
+;; - get a timeline in a buffer in emacs
+;; - allow for replies
+;; - allow for direct messages
+;; - manage follow lists
+;; - have avatars obviously. (including the checkmark, which is brilliant)
+;;
+
+;; Requirements
+;; - json-rpc : https://github.com/mrvdb/elisp-json-rpc
+;;   This repository is included as submodule
+
+;; Installation
+;; (add-to-list 'load-path "/path/to/twister.el")
+;; (require 'twister)
+;; (setq twister-user "yournick")
+;;
+;;; Credits
+;;  - The elisp-json-rpc library of Christopher Wellons <wellons@nullprogrma.com>
+;;    does the real work
+
+;;; Code:
+(add-to-list 'load-path "elisp-json-rpc")
+(require 'json-rpc)
+
+;; Configuration variables
+(defgroup twister nil
+  "Using the twister microblogging system"
+  :tag "Microblogging"
+  :group 'applications
+  )
+
+(defcustom twister-user "twister_user"
+  "The nickname you use on your twister instance. When posting messages, this will be the name used"
+  :type 'string
+  :group 'twister)
+
+(defcustom twister-rpcuser "user"
+  "The RPC username configured in the twister.conf file"
+  :type 'string
+  :group 'twister)
+
+(defcustom twister-rpcpassword "pwd"
+  "The RPC password for the `twister-rpcuser configured in the twister.conf file"
+  :type 'string
+  :group 'twitter)
+
+(defcustom twister-host "localhost"
+  "Host where the twister daemon runs"
+  :type 'string
+  :group 'twister)
+
+(defcustom twister-port 28332
+  "Port on which twister daemon runs and serves RPC commands"
+  :type 'integer
+  :group 'twister)
+
+
+;; Get a connection to the twister daemon
+(setf twisterd (json-rpc-connect
+                twister-host twister-port
+                twister-rpcuser twister-rpcpassword))
+
+;; Preliminary convention
+;; tw-* methods      -> sorta private for now, don't use directly
+;; twister-* methods -> public API
+
+(defun tw-get-last-post(user)
+  "Get the last post of a user"
+  (let (obj (json-new-object))
+    (json-rpc twisterd "getposts" 1
+              (vector (json-add-to-object obj "username" user)))))
+
+(defun tw-get-next-k(user)
+  "Get the next 'k' for a user; this is a post sequence"
+  ;; Data structure visible here: http://twister.net.co/?page_id=21
+  (+ 1 (plist-get
+   (plist-get
+    (elt (tw-get-last-post user) 0)
+    :userpost) :k)))
+
+(defun twister-post(msg)
+  "Post msg to the configured twister daemon"
+  (interactive)
+
+  (json-rpc
+   twisterd "newpostmsg"
+   twister-user
+   (tw-get-next-k twister-user) msg))
+
+
+(defun twister-post-region (begin end)
+  "Post the current region to twister"
+  (interactive "r")
+
+  (twister-post
+   (buffer-substring-no-properties begin end)))
+
+(defun twister-post-buffer()
+  "Post the current buffer to twister"
+  (interactive)
+
+  (twister-post-region
+   (point-min point-max)))
+
+
+(provide 'twister)
+;;; twister.el ends here