Add a button to update the archive list. Also display the last update time.

html/General/Settings-section-Archives.html

@@ -1,5 +1,6 @@
 <div class="warning" #{if Conf['404 Redirect'] then 'hidden' else ''}><code>404 Redirect</code> is disabled.</div>
 <p>Disabled selections indicate that only one archive is available for that board and redirection type.</p>
+<p><button>Update now</button> Last updated: <time></time></p>
 <table>
   <caption>Archived boards</caption>
   <thead>

src/Archive/Redirect.coffee

@@ -34,7 +34,7 @@ Redirect =
           Redirect.file[boardID] = archive
     return
 
-  update: ->
+  update: (cb) ->
     $.get 'lastarchivecheck', 0, ({lastarchivecheck}) ->
       now = Date.now()
       # Update the list of archives every 4 days.
@@ -46,6 +46,7 @@ Redirect =
         $.set
           lastarchivecheck: now
           archives: Conf['archives']
+        cb now if cb
 
   to: (dest, data) ->
     archive = (if dest is 'search' then Redirect.thread else Redirect[dest])[data.boardID]

src/General/Settings.coffee

@@ -399,6 +399,20 @@ Settings =
     <%= grunt.file.read('html/General/Settings-section-Archives.html').replace(/>\s+</g, '><').trim() %>
     """
 
+    showLastUpdateTime = (time) ->
+      $('time', section).textContent = new Date(time).toLocaleString()
+
+    button = $ 'button', section
+    $.on button, 'click', ->
+      $.delete 'lastarchivecheck'
+      button.textContent = '...'
+      button.disabled = true
+      Redirect.update (time) ->
+        button.textContent = 'Updated'
+        showLastUpdateTime time
+
+    $.get 'lastarchivecheck', 0, ({lastarchivecheck}) -> showLastUpdateTime lastarchivecheck
+
     boards = {}
     for archive in Conf['archives']
       for boardID in archive.boards