added detection of rtl languages on every user based input

app/helpers/application_helper.rb

@@ -280,4 +280,8 @@ module ApplicationHelper
 
     defaults
   end
+
+  def rtl?(string)
+    return (string.cleaned_is_rtl?) ? 'rtl' : ''
+  end
 end

app/views/comments/_comment.html.haml

@@ -13,5 +13,5 @@
       %time.timeago{:datetime => comment.created_at}
         = comment.created_at ? timeago(comment.created_at) : timeago(Time.now)
 
-    %p
+    %p{ :class => rtl?(comment.text) }
       = markdownify(comment.text, :youtube_maps => comment.youtube_titles)

app/views/comments/_comment.mobile.haml

@@ -14,5 +14,6 @@
   .content
     .from
       = person_link(comment.author)
-    = markdownify(comment.text, :youtube_maps => comment[:youtube_titles])
+    %p{ :class => rtl?(comment.text) }
+      = markdownify(comment.text, :youtube_maps => comment[:youtube_titles])
 

app/views/conversations/_conversation.haml

@@ -10,7 +10,8 @@
       .message_count
         = conversation.messages.size
 
-      = conversation.subject[0..30]
+      %div{ :class => rtl?(conversation.subject) }
+        = conversation.subject[0..30]
 
     .last_author
       .timestamp

app/views/conversations/_show.haml

@@ -6,7 +6,7 @@
 .span-16.last
   .conversation_participants
     .span-9
-      %h3
+      %h3{ :class => rtl?(conversation.subject) }
         = conversation.subject
 
       .conversation_controls

app/views/messages/_message.haml

@@ -11,6 +11,6 @@
       %time.timeago{:datetime => message.created_at}
         = how_long_ago(message)
 
-    %p
+    %p{ :class => rtl?(message.text) }
       = markdownify(message.text)
 

app/views/people/_profile_sidebar.html.haml

@@ -41,12 +41,14 @@
         %li
           %h4
             =t('.bio')
-          = markdownify(person.profile.bio, :newlines => true)
+          %div{ :class => rtl?(person.profile.bio) }
+            = markdownify(person.profile.bio, :newlines => true)
       - unless person.profile.location.blank?
         %li
           %h4
             =t('.location')
-          = markdownify(person.profile.location, :newlines => true)
+          %div{ :class => rtl?(person.profile.location) }
+            = markdownify(person.profile.location, :newlines => true)
 
       %li.span-8.last
         .span-4

app/views/status_messages/_status_message.haml

@@ -14,5 +14,5 @@
         - for photo in photos[1..photos.size]
           = link_to (image_tag photo.url(:thumb_small), :class => 'thumb_small'), photo_path(photo)
 
-%p
+%p{ :class => rtl?(post.text) }
   = markdownify(post.text, :youtube_maps => post[:youtube_titles])

config/assets.yml

@@ -29,6 +29,7 @@ javascripts:
     - public/javascripts/widgets/alert.js
     - public/javascripts/widgets/embedder.js
     - public/javascripts/widgets/timeago.js
+    - public/javascripts/widgets/directionDetector.js
     - public/javascripts/view.js
     - public/javascripts/stream.js
     - public/javascripts/application.js

config/initializers/direction_detector.rb

@@ -0,0 +1,55 @@
+#   Copyright (c) 2010, Diaspora Inc.  This file is
+#   licensed under the Affero General Public License version 3 or later.  See
+#   the COPYRIGHT file.
+# Deeply inspired by https://gitorious.org/statusnet/mainline/blobs/master/plugins/DirectionDetector/DirectionDetectorPlugin.php
+
+class String
+
+  def is_rtl?
+    count = 0
+    self.strip.split(" ").each do |word|
+      if starts_with_rtl_char?(word)
+        count += 1
+      else
+        count -= 1
+      end
+    end
+    return true if count > 0 # more than half of the words are rtl words
+    return starts_with_rtl_char?(self.strip) # otherwise let the first word decide
+  end
+
+  # Diaspora specific
+  def cleaned_is_rtl?
+    string = String.new(self)
+    [ /@[^ ]+|#[^ ]+/u, # mention, tag
+      /^RT[: ]{1}| RT | RT: |[♺♻:]/u, # retweet
+      /[ \r\t\n]+/ # whitespaces 
+    ].each do |cleaner|
+      string.gsub!(cleaner, '')
+    end
+    string.is_rtl?
+  end
+
+  private
+
+  def starts_with_rtl_char?(string)
+    string = self.strip
+    return false if string.empty?
+    char = string.unpack('U*').first
+    limits = [
+      [1536, 1791], # arabic, persian, urdu, kurdish, ...
+      [65136, 65279], # arabic peresent 2
+      [64336, 65023], # arabic peresent 1
+      [1424, 1535], # hebrew
+      [64256, 64335], # hebrew peresent
+      [1792, 1871], # syriac
+      [1920, 1983], # thaana
+      [1984, 2047], # nko
+      [11568, 11647] # tifinagh
+    ]
+    limits.each do |limit|
+      return true if char >= limit[0] && char <= limit[1]
+    end
+    return false
+  end
+end

public/javascripts/application.js

@@ -25,10 +25,10 @@ $(document).ready(function() {
         .css("display", "block");
     }
     Diaspora.widgets.timeago.updateTimeAgo();
+    Diaspora.widgets.directionDetector.updateBinds();
   });
 
 
-
   $("a.paginate").live("click", function() {
     $(this).css("display", "none");
 

public/javascripts/inbox.js

@@ -6,13 +6,17 @@
 $(document).ready(function(){
 
   $('a.conversation').live('click', function(){
-    $.getScript(this.href);
+    $.getScript(this.href, function() {
+      Diaspora.widgets.directionDetector.updateBinds();
+    });
     history.pushState(null, "", this.href);
     return false;
   });
 
   $(window).bind("popstate", function(){
-    $.getScript(location.href);
+    $.getScript(location.href, function() {
+      Diaspora.widgets.directionDetector.updateBinds();
+    });
     return false;
   });
 

public/javascripts/stream.js

@@ -11,6 +11,7 @@ var Stream = {
     $(".status_message_delete").tipsy({trigger: 'hover', gravity: 'n'});
 
     Diaspora.widgets.timeago.updateTimeAgo();
+    Diaspora.widgets.directionDetector.updateBinds();
     $stream.not(".show").delegate("a.show_post_comments", "click", Stream.toggleComments);
     //audio linx
     Stream.setUpAudioLinks();

public/javascripts/view.js

@@ -58,6 +58,9 @@ var View = {
     $.facebox.settings.closeImage = '/images/facebox/closelabel.png'
     $.facebox.settings.loadingImage = '/images/facebox/loading.gif'
     $('a[rel*=facebox]').facebox();
+    $(document).bind('reveal.facebox', function() {
+      Diaspora.widgets.directionDetector.updateBinds();
+    });
 
     /* facebox 'done' buttons */
     $("a[rel*=close]").live('click', function(){ $.facebox.close() });

public/javascripts/web-socket-receiver.js

@@ -126,6 +126,7 @@ var WebSocketReceiver = {
     }
 
     Diaspora.widgets.timeago.updateTimeAgo();
+    Diaspora.widgets.directionDetector.updateBinds();
   },
 
   processLike: function(postId, html) {
@@ -157,6 +158,7 @@ var WebSocketReceiver = {
         showMessage();
       }
       Diaspora.widgets.timeago.updateTimeAgo();
+      Diaspora.widgets.directionDetector.updateBinds();
     }
   },
 

public/javascripts/widgets/directionDetector.js

@@ -0,0 +1,64 @@
+/*   Copyright (c) 2010, Diaspora Inc.  This file is
+ *   licensed under the Affero General Public License version 3 or later.  See
+ *   the COPYRIGHT file.
+ */
+/* Modified version of https://gitorious.org/statusnet/mainline/blobs/master/plugins/DirectionDetector/jquery.DirectionDetector.js */
+
+Diaspora.widgets.add("directionDetector", function() {
+
+  this.start = function() {
+    Diaspora.widgets.directionDetector.updateBinds();
+  };
+
+  this.isRTL = function(str) {
+    if(typeof str != typeof "" || str.length<1)
+      return false;
+    var cc = str.charCodeAt(0);
+    if(cc>=1536 && cc<=1791) // arabic, persian, ...
+      return true;
+    if(cc>=65136 && cc<=65279) // arabic peresent 2
+      return true;
+    if(cc>=64336 && cc<=65023) // arabic peresent 1
+      return true;
+    if(cc>=1424 && cc<=1535) // hebrew
+      return true;
+    if(cc>=64256 && cc<=64335) // hebrew peresent
+      return true;
+    if(cc>=1792 && cc<=1871) // Syriac
+      return true;
+    if(cc>=1920 && cc<=1983) // Thaana
+      return true;
+    if(cc>=1984 && cc<=2047) // NKo
+      return true;
+    if(cc>=11568 && cc<=11647) // Tifinagh
+      return true;
+    return false;
+    };
+
+  this.cleaner = new RegExp('@[^ ]+|^RT[: ]{1}| RT | RT: |[♺♻:]+', 'g');
+
+  this.binds = [];
+  
+  this.updateBinds = function() {
+    $.each(Diaspora.widgets.directionDetector.binds, function(i, v) {v.unbind('keyup', Diaspora.widgets.directionDetector.updateDirection);});
+    Diaspora.widgets.directionDetector.binds = [];
+
+    $("textarea").each(Diaspora.widgets.directionDetector.bind);
+    $("input[type='text']").each(Diaspora.widgets.directionDetector.bind);
+    $("input[type='search']").each(Diaspora.widgets.directionDetector.bind);
+  };
+
+  this.bind = function() {
+    $(this).one('keyup', Diaspora.widgets.directionDetector.updateDirection);
+    Diaspora.widgets.directionDetector.binds.push($(this));
+  };
+
+  this.updateDirection = function() {
+    tArea = $(this);
+    var cleaned = tArea.val().replace(Diaspora.widgets.directionDetector.cleaner, '').replace(/^[ ]+/, '');
+    if(Diaspora.widgets.directionDetector.isRTL(cleaned))
+      tArea.css('direction', 'rtl');
+    else
+      tArea.css('direction', 'ltr');
+  };
+});

public/stylesheets/sass/application.sass

@@ -47,6 +47,10 @@ form
     :font
       :size auto
 
+.rtl
+  :direction rtl
+  :text-align right
+
 .hidden
   :display none