add copybutton from cpython sources

allows toggling the input markers in source examples to allow
copy & pasting them.

Author: juliantaylor

_theme/scipy/layout.html

@@ -96,11 +96,12 @@
         HAS_SOURCE:  {{ has_source|lower }}
       };
     </script>
-    <script type="text/javascript" src="{{ pathto('_static/js/jquery.min.js', 1) }}"></script>
-    <script type="text/javascript" src="{{ pathto('_static/js/bootstrap.min.js', 1) }}"></script>
     {%- for scriptfile in script_files %}
     <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
     {%- endfor %}
+    <script type="text/javascript" src="{{ pathto('_static/js/jquery.min.js', 1) }}"></script>
+    <script type="text/javascript" src="{{ pathto('_static/js/bootstrap.min.js', 1) }}"></script>
+    <script type="text/javascript" src="{{ pathto('_static/js/copybutton.js', 1) }}"></script>
 {%- endmacro %}
 
 {%- macro css() %}

_theme/scipy/static/js/copybutton.js

@@ -0,0 +1,60 @@
+// Copyright 2014 PSF. Licensed under the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
+// File originates from the cpython source found in Doc/tools/sphinxext/static/copybutton.js
+
+$(document).ready(function() {
+    /* Add a [>>>] button on the top-right corner of code samples to hide
+     * the >>> and ... prompts and the output and thus make the code
+     * copyable. */
+    var div = $('.highlight-python .highlight,' +
+                '.highlight-python3 .highlight')
+    var pre = div.find('pre');
+
+    // get the styles from the current theme
+    pre.parent().parent().css('position', 'relative');
+    var hide_text = 'Hide the prompts and output';
+    var show_text = 'Show the prompts and output';
+    var border_width = pre.css('border-top-width');
+    var border_style = pre.css('border-top-style');
+    var border_color = pre.css('border-top-color');
+    var button_styles = {
+        'cursor':'pointer', 'position': 'absolute', 'top': '0', 'right': '0',
+        'border-color': border_color, 'border-style': border_style,
+        'border-width': border_width, 'color': border_color, 'text-size': '75%',
+        'font-family': 'monospace', 'padding-left': '0.2em', 'padding-right': '0.2em',
+        'border-radius': '0 3px 0 0'
+    }
+
+    // create and add the button to all the code blocks that contain >>>
+    div.each(function(index) {
+        var jthis = $(this);
+        if (jthis.find('.gp').length > 0) {
+            var button = $('<span class="copybutton">&gt;&gt;&gt;</span>');
+            button.css(button_styles)
+            button.attr('title', hide_text);
+            jthis.prepend(button);
+        }
+        // tracebacks (.gt) contain bare text elements that need to be
+        // wrapped in a span to work with .nextUntil() (see later)
+        jthis.find('pre:has(.gt)').contents().filter(function() {
+            return ((this.nodeType == 3) && (this.data.trim().length > 0));
+        }).wrap('<span>');
+    });
+
+    // define the behavior of the button when it's clicked
+    $('.copybutton').toggle(
+        function() {
+            var button = $(this);
+            button.parent().find('.go, .gp, .gt').hide();
+            button.next('pre').find('.gt').nextUntil('.gp, .go').css('visibility', 'hidden');
+            button.css('text-decoration', 'line-through');
+            button.attr('title', show_text);
+        },
+        function() {
+            var button = $(this);
+            button.parent().find('.go, .gp, .gt').show();
+            button.next('pre').find('.gt').nextUntil('.gp, .go').css('visibility', 'visible');
+            button.css('text-decoration', 'none');
+            button.attr('title', hide_text);
+        });
+});
+