From a2f3490aca4588a171f4f82e6d12d7d60cb2a6bc Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 13 Oct 2016 09:58:00 +0530
Subject: [PATCH] Edit Book: Add a tool to download external resources
 (images/stylesheets/etc) that are not included in the book. Fixes #1620058
 [[Enhancement] External image
 links](https://bugs.launchpad.net/calibre/+bug/1620058)

---
 src/calibre/gui2/tweak_book/boss.py | 19 +++++++++++++++++++
 src/calibre/gui2/tweak_book/ui.py   |  5 ++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 86136a05ae..41d850d194 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -583,6 +583,25 @@ class Boss(QObject):
             return
         self.show_current_diff()
 
+    def get_external_resources(self):
+        if not self.ensure_book(_('You must first open a book in order to transform styles.')):
+            return
+        from calibre.gui2.tweak_book.download import DownloadResources
+        with BusyCursor():
+            self.add_savepoint(_('Before get external resources'))
+        try:
+            d = DownloadResources(self.gui)
+            d.exec_()
+        except Exception:
+            self.rewind_savepoint()
+            raise
+        if d.resources_replaced:
+            self.apply_container_update_to_gui()
+            if d.show_diff:
+                self.show_current_diff()
+        else:
+            self.rewind_savepoint()
+
     def manage_fonts(self):
         self.commit_all_editors_to_container()
         self.gui.manage_fonts.display()
diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index 74f03c251c..5e48630376 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -399,7 +399,9 @@ class Main(MainWindow):
             'Check external links in the book'))
         self.action_compress_images = treg('compress-image.png', _('Compress &images losslessly'), self.boss.compress_images, 'compress-images', (), _(
             'Compress images losslessly'))
-        self.action_transform_styles = treg('wizard.png', _('Transform &styles'), self.boss.transform_styles, 'transform-styles', (), _(
+        self.action_transform_styles = treg('wizard.png', _('Transform &styles'), self.boss.transform_styles, 'get-external-resources', (), _(
+            'Download external resources in the book (images/stylesheets/etc/ that are not included in the book)'))
+        self.action_get_ext_resources = treg('download-metadata.png', _('Get external &resources'), self.boss.get_external_resources, 'transform-styles', (), _(
             'Transform styles used in the book'))
 
         def ereg(icon, text, target, sid, keys, description):
@@ -564,6 +566,7 @@ class Main(MainWindow):
         e.addAction(self.action_filter_css)
         e.addAction(self.action_spell_check_book)
         e.addAction(self.action_check_external_links)
+        e.addAction(self.action_get_ext_resources)
         e.addAction(self.action_check_book)
         e.addAction(self.action_reports)