Close #933.

CHANGELOG.md

@@ -1,3 +1,4 @@
+- **New feature**: `Announcement Hiding`, enabled by default.
 - Fix support for www.4chan.org/frames on Chrome.
 - Fix quote features not working on dead quotelinks in inlined posts.
 - Fix resurrecting dead quotelinks on HTTP.

css/style.css

@@ -370,6 +370,11 @@ a[href="javascript:;"] {
   overflow: hidden;
 }
 
+/* Announcement Hiding */
+:root.hide-announcement #globalMessage {
+  display: none;
+}
+
 /* Unread */
 #unread-line {
   margin: 0;

src/config.coffee

@@ -3,6 +3,7 @@ Config =
     'Miscellaneous':
       'Enable 4chan\'s Extension':    [false, 'Compatibility between <%= meta.name %> and 4chan\'s inline extension is NOT guaranteed.']
       'Custom Board Navigation':      [true,  'Show custom links instead of the full board list']
+      'Announcement Hiding':          [true,  'Add button to hide 4chan announcements.']
       '404 Redirect':                 [true,  'Redirect dead threads and images.']
       'Keybinds':                     [true,  'Bind actions to keyboard shortcuts.']
       'Time Formatting':              [true,  'Localize and format timestamps.']

src/features.coffee

@@ -783,6 +783,55 @@ Settings =
     @value = key
     $.cb.value.call @
 
+PSAHiding =
+  init: ->
+    return if !Conf['Announcement Hiding']
+
+    $.addClass doc, 'hide-announcement'
+
+    $.on d, '4chanXInitFinished', @setup
+  setup: ->
+    $.off d, '4chanXInitFinished', PSAHiding.setup
+
+    unless psa = $.id 'globalMessage'
+      $.rmClass doc, 'hide-announcement'
+      return
+
+    PSAHiding.btn = btn = $.el 'a',
+      title: 'Toggle announcement.'
+      href: 'javascript:;'
+    $.on btn, 'click', PSAHiding.toggle
+
+    text = PSAHiding.trim psa
+    $.get 'hiddenPSAs', [], (item) ->
+      PSAHiding.sync item['hiddenPSAs']
+      $.before psa, btn
+      $.rmClass doc, 'hide-announcement'
+
+    $.sync 'hiddenPSAs', PSAHiding.sync
+  toggle: (e) ->
+    hide = $.hasClass @, 'hide-announcement'
+    text = PSAHiding.trim $.id 'globalMessage'
+    $.get 'hiddenPSAs', [], (item) ->
+      {hiddenPSAs} = item
+      if hide
+        hiddenPSAs.push text
+      else
+        i = hiddenPSAs.indexOf text
+        hiddenPSAs.splice i, 1
+      hiddenPSAs = hiddenPSAs[-5..]
+      PSAHiding.sync hiddenPSAs
+      $.set 'hiddenPSAs', hiddenPSAs
+  sync: (hiddenPSAs) ->
+    {btn} = PSAHiding
+    psa   = $.id 'globalMessage'
+    [psa.hidden, btn.innerHTML, btn.className] = if PSAHiding.trim(psa) in hiddenPSAs
+      [true,  '[ + ]', 'show-announcement']
+    else
+      [false, '[ - ]', 'hide-announcement']
+  trim: (psa) ->
+    psa.textContent.replace(/\W+/g, '').toLowerCase()
+
 Fourchan =
   init: ->
     return if g.VIEW is 'catalog'

src/main.coffee

@@ -346,6 +346,7 @@ Main =
     initFeature 'Polyfill',                 Polyfill
     initFeature 'Header',                   Header
     initFeature 'Settings',                 Settings
+    initFeature 'Announcement Hiding',      PSAHiding
     initFeature 'Fourchan thingies',        Fourchan
     initFeature 'Custom CSS',               CustomCSS
     initFeature 'Resurrect Quotes',         Quotify