better connection close handling

Depending on how the webapp was started up and whether the user clicked on
any links in it, window.close() may be disallowed by browser security
policy. Also if that fails, display a modal dialog that nicely blackens out
the webapp.

TODO: avoid Escape closing it. Bootstrap's docs are unclear about how to do
that.

Assistant/Threads/WebApp.hs

@@ -115,6 +115,7 @@ instance Yesod WebApp where
 			addStylesheet $ StaticR css_bootstrap_responsive_css
 			addScript $ StaticR jquery_full_js
 			addScript $ StaticR js_bootstrap_dropdown_js
+			addScript $ StaticR js_bootstrap_modal_js
 			$(widgetFile "page")
 		hamletToRepHtml $(hamletFile $ hamletTemplate "bootstrap")
 

static/js/bootstrap-modal.js

@@ -0,0 +1,210 @@
+/* =========================================================
+ * bootstrap-modal.js v2.0.2
+ * http://twitter.github.com/bootstrap/javascript.html#modals
+ * =========================================================
+ * Copyright 2012 Twitter, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ========================================================= */
+
+
+!function( $ ){
+
+  "use strict"
+
+ /* MODAL CLASS DEFINITION
+  * ====================== */
+
+  var Modal = function ( content, options ) {
+    this.options = options
+    this.$element = $(content)
+      .delegate('[data-dismiss="modal"]', 'click.dismiss.modal', $.proxy(this.hide, this))
+  }
+
+  Modal.prototype = {
+
+      constructor: Modal
+
+    , toggle: function () {
+        return this[!this.isShown ? 'show' : 'hide']()
+      }
+
+    , show: function () {
+        var that = this
+
+        if (this.isShown) return
+
+        $('body').addClass('modal-open')
+
+        this.isShown = true
+        this.$element.trigger('show')
+
+        escape.call(this)
+        backdrop.call(this, function () {
+          var transition = $.support.transition && that.$element.hasClass('fade')
+
+          !that.$element.parent().length && that.$element.appendTo(document.body) //don't move modals dom position
+
+          that.$element
+            .show()
+
+          if (transition) {
+            that.$element[0].offsetWidth // force reflow
+          }
+
+          that.$element.addClass('in')
+
+          transition ?
+            that.$element.one($.support.transition.end, function () { that.$element.trigger('shown') }) :
+            that.$element.trigger('shown')
+
+        })
+      }
+
+    , hide: function ( e ) {
+        e && e.preventDefault()
+
+        if (!this.isShown) return
+
+        var that = this
+        this.isShown = false
+
+        $('body').removeClass('modal-open')
+
+        escape.call(this)
+
+        this.$element
+          .trigger('hide')
+          .removeClass('in')
+
+        $.support.transition && this.$element.hasClass('fade') ?
+          hideWithTransition.call(this) :
+          hideModal.call(this)
+      }
+
+  }
+
+
+ /* MODAL PRIVATE METHODS
+  * ===================== */
+
+  function hideWithTransition() {
+    var that = this
+      , timeout = setTimeout(function () {
+          that.$element.off($.support.transition.end)
+          hideModal.call(that)
+        }, 500)
+
+    this.$element.one($.support.transition.end, function () {
+      clearTimeout(timeout)
+      hideModal.call(that)
+    })
+  }
+
+  function hideModal( that ) {
+    this.$element
+      .hide()
+      .trigger('hidden')
+
+    backdrop.call(this)
+  }
+
+  function backdrop( callback ) {
+    var that = this
+      , animate = this.$element.hasClass('fade') ? 'fade' : ''
+
+    if (this.isShown && this.options.backdrop) {
+      var doAnimate = $.support.transition && animate
+
+      this.$backdrop = $('<div class="modal-backdrop ' + animate + '" />')
+        .appendTo(document.body)
+
+      if (this.options.backdrop != 'static') {
+        this.$backdrop.click($.proxy(this.hide, this))
+      }
+
+      if (doAnimate) this.$backdrop[0].offsetWidth // force reflow
+
+      this.$backdrop.addClass('in')
+
+      doAnimate ?
+        this.$backdrop.one($.support.transition.end, callback) :
+        callback()
+
+    } else if (!this.isShown && this.$backdrop) {
+      this.$backdrop.removeClass('in')
+
+      $.support.transition && this.$element.hasClass('fade')?
+        this.$backdrop.one($.support.transition.end, $.proxy(removeBackdrop, this)) :
+        removeBackdrop.call(this)
+
+    } else if (callback) {
+      callback()
+    }
+  }
+
+  function removeBackdrop() {
+    this.$backdrop.remove()
+    this.$backdrop = null
+  }
+
+  function escape() {
+    var that = this
+    if (this.isShown && this.options.keyboard) {
+      $(document).on('keyup.dismiss.modal', function ( e ) {
+        e.which == 27 && that.hide()
+      })
+    } else if (!this.isShown) {
+      $(document).off('keyup.dismiss.modal')
+    }
+  }
+
+
+ /* MODAL PLUGIN DEFINITION
+  * ======================= */
+
+  $.fn.modal = function ( option ) {
+    return this.each(function () {
+      var $this = $(this)
+        , data = $this.data('modal')
+        , options = $.extend({}, $.fn.modal.defaults, $this.data(), typeof option == 'object' && option)
+      if (!data) $this.data('modal', (data = new Modal(this, options)))
+      if (typeof option == 'string') data[option]()
+      else if (options.show) data.show()
+    })
+  }
+
+  $.fn.modal.defaults = {
+      backdrop: true
+    , keyboard: true
+    , show: true
+  }
+
+  $.fn.modal.Constructor = Modal
+
+
+ /* MODAL DATA-API
+  * ============== */
+
+  $(function () {
+    $('body').on('click.modal.data-api', '[data-toggle="modal"]', function ( e ) {
+      var $this = $(this), href
+        , $target = $($this.attr('data-target') || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
+        , option = $target.data('modal') ? 'toggle' : $.extend({}, $target.data(), $this.data())
+
+      e.preventDefault()
+      $target.modal(option)
+    })
+  })
+
+}( window.jQuery );

templates/longpolling.julius

@@ -5,9 +5,9 @@
 // Maximum update frequency is controlled by #{startdelay}
 // and #{delay}, both in milliseconds.
 
-(function( $ ) {
+$dead=0;
 
-numerrs=0;
+(function( $ ) {
 
 $.LongPoll#{ident} = (function() {
 	return {
@@ -21,12 +21,11 @@ $.LongPoll#{ident} = (function() {
 					numerrs=0;
 				},
 				'error': function(jqxhr, msg, e) {
-					numerrs=numerrs+1;
-					if (numerrs > 3) {
+					if (! $dead) {
+						$dead=1;
+						// blocked by many browsers
 						window.close();
-					}
-					else {
-						setTimeout($.LongPoll#{ident}.send, #{show delay});
+						$('#lostconnection').modal('show');
 					}
 				},
 			});

templates/page.hamlet

@@ -21,3 +21,10 @@
 <div .container-fluid>
   <div .row-fluid>
     ^{content}
+<div #lostconnection .modal .fade>
+  <div .modal-header>
+     <h3>
+       git-annex has shut down
+     <div .modal-body>
+       <p>
+         You can now close this browser window.