From ed4c150eee1c72c0cbf517099dd3dc6ff94a6dec Mon Sep 17 00:00:00 2001
From: jomae <jomae@af82e41b-90c4-0310-8c96-b1721e28e2e2>
Date: Wed, 5 Feb 2025 12:13:06 +0000
Subject: [PATCH] 1.6.1dev: use the inline style element in prefs/pygments
 panel in order to prevent many requests on page load (closes #13864)

git-svn-id: http://trac.edgewall.org/intertrac/log:/branches/1.6-stable@17878 af82e41b-90c4-0310-8c96-b1721e28e2e2
---
 trac/mimeview/pygments.py                   | 24 ++++++++++++-----
 trac/mimeview/templates/prefs_pygments.html | 29 ++++++++++-----------
 2 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/trac/mimeview/pygments.py b/trac/mimeview/pygments.py
index 290a17f9bc..c3fa038346 100644
--- a/trac/mimeview/pygments.py
+++ b/trac/mimeview/pygments.py
@@ -154,7 +154,7 @@ def get_preference_panels(self, req):
         yield 'pygments', _('Syntax Highlighting')
 
     def render_preference_panel(self, req, panel):
-        styles = list(get_all_styles())
+        styles = set(get_all_styles())
 
         if req.method == 'POST':
             style = req.args.get('style')
@@ -165,15 +165,25 @@ def render_preference_panel(self, req, panel):
             add_notice(req, _("Your preferences have been saved."))
             req.redirect(req.href.prefs(panel or None))
 
-        for style in sorted(styles):
-            add_stylesheet(req, '/pygments/%s.css' % style, title=style.title())
+        def style_defs(style):
+            cls = get_style_by_name(style)
+            selector = '.trac-pygments-%s div.code pre' % style
+            return _get_style_defs(cls, selector)
+
+        default_style = self.default_style
+        if default_style not in styles:
+            default_style = 'trac'
+        selection = req.session.get('pygments_style')
+        if selection not in styles:
+            selection = default_style
         output = self._generate('html', self.EXAMPLE)
-        add_script_data(req, default_style=self.default_style.title())
+        add_script_data(req, default_style=default_style, selection=selection)
         return 'prefs_pygments.html', {
             'output': output,
-            'selection': req.session.get('pygments_style'),
-            'default_style': self.default_style,
-            'styles': styles
+            'selection': selection,
+            'default_style': default_style,
+            'styles': sorted(styles),
+            'style_defs': style_defs,
         }
 
     # IRequestHandler methods
diff --git a/trac/mimeview/templates/prefs_pygments.html b/trac/mimeview/templates/prefs_pygments.html
index 8221a1bcdb..7794fcb2d2 100644
--- a/trac/mimeview/templates/prefs_pygments.html
+++ b/trac/mimeview/templates/prefs_pygments.html
@@ -24,22 +24,21 @@
       div.code pre { border: 1px solid #999; font-size: 90%; margin: 1em 2em;
         padding: 5px; width: 60%;
       }
+      # for style_ in styles:
+      ${- style_defs(style_)|safe}
+      # endfor
     </style>
     <script>
-      (function($){
-        window.switchStyleSheet = function(title) {
-          $('link[rel="stylesheet"][title]').each(function() {
-            this.disabled = true; // needed to force correct behavior for WebKit (see #10923)
-            this.disabled = this.getAttribute('title') != title;
-          });
-        }
-      })(jQuery);
       jQuery(function($) {
-        $("#pygment_theme").attr("autocomplete", "off").on('change keypress', function() {
-          var idx = this.selectedIndex;
-          var text = this.options[idx].text;
-          var stylesheet = idx > 0 ? text : default_style;
-          switchStyleSheet(stylesheet);
+        var selection = window.selection;
+        var default_style = window.default_style;
+        var $theme = $('#pygment_theme');
+        var $field = $theme.closest('div.field');
+        $theme.attr("autocomplete", "off").on('change keypress', function() {
+          var style = this.value || default_style;
+          $field.removeClass('trac-pygments-' + selection)
+                .addClass('trac-pygments-' + style);
+          selection = style;
         }).change();
       });
     </script>
@@ -48,12 +47,12 @@
 
   <body>
     # block prefpanel
-    <div class="field">
+    <div class="field trac-pygments-${selection}">
       <label>${_("Style:")}
         <select id="pygment_theme" name="style">
           <option value="">${_("Default: %(default)s",
                                default=default_style.title())}</option>
-          # for style in sorted(styles):
+          # for style in styles:
           <option${{'value': style,
                     'selected': selection == style
                    }|htmlattr}>${style.title()}</option>