Add Twitter layer

layers/+fun/twitter/README.org

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+#+TITLE: Twitter contribution layer for Spacemacs
+[[file:img/twitter.png]]
+* Table of Contents                                                     :TOC:
+ - [[#description][Description]]
+ - [[#features][Features]]
+ - [[#install][Install]]
+     - [[#layer][Layer]]
+ - [[#key-bindings][Key Bindings]]
+
+* Description
+This layer adds Twitter support to Spacemacs via the package =twittering-mode=,
+do not hesitate to check the original package README [[https://github.com/hayamiz/twittering-mode][here]].
+
+* Features
+- Activities on Twitter
+  - Viewing various timelines
+    - Home timeline
+    - Replies
+    - User's timeline
+    - Public timeline
+    - Favorites timeline
+    - Retweets timeline
+    - Merged timeline
+    - Timeline without tweets satisfying a condition
+  - Posting tweets
+    - Direct message
+    - ReTweet
+    - Hash tag
+    - Signature
+  - Following and removing users
+  - Marking tweets as favorites
+- HTTP Proxy support
+- Secure connection via HTTPS (cURL, GNU Wget, OpenSSL or GnuTLS is required)
+
+* Install
+** Layer
+#+begin_src emacs-lisp
+  (setq-default dotspacemacs-configuration-layers '(twitter))
+#+end_src
+
+* Key Bindings
+
+Check out the original package doc [[https://github.com/hayamiz/twittering-mode/blob/master/README.markdown#usage][here]] as the key bindings =feel= evil enough :).

layers/+fun/twitter/packages.el

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+;;; packages.el --- twitter Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;; List of all packages to install and/or initialize. Built-in packages
+;; which require an initialization must be listed explicitly in the list.
+(setq twitter-packages
+    '(twittering-mode))
+
+(defun twitter/init-twittering-mode ()
+  (use-package twittering-mode
+    :commands twit
+    :init
+    (evil-leader/set-key
+      "at" 'twit)
+    (when (configuration-layer/package-usedp 'flyspell)
+      (add-hook 'twittering-edit-mode-hook (lambda () (flyspell-mode 1))))
+    (push 'twittering-edit-mode evil-insert-state-modes)
+    :config
+    (setq twitter-images-directory
+          (expand-file-name
+           (concat spacemacs-cache-directory "twitter-images")))
+    (unless (file-exists-p twitter-images-directory)
+      (make-directory twitter-images-directory))
+    (setq twittering-icon-mode t)
+    (setq twittering-url-show-status nil)
+    (setq twittering-use-master-password t)
+    (setq twittering-use-icon-storage 1)))