Allow using relative URLs in comments type metadata. The relative URLs are interpreted relative to the book folder in the calibre library

src/calibre/gui2/book_details.py

@@ -3,6 +3,7 @@
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
 import cPickle
+import os
 import re
 from binascii import unhexlify
 from collections import namedtuple
@@ -38,6 +39,18 @@ _css = None
 InternetSearch = namedtuple('InternetSearch', 'author where')
 
 
+def set_html(mi, html, web_view):
+    from calibre.gui2.ui import get_gui
+    gui = get_gui()
+    book_id = getattr(mi, 'id', None)
+    if gui and book_id is not None:
+        path = gui.current_db.abspath(book_id, index_is_id=True)
+        if path:
+            web_view.setHtml(html, QUrl.fromLocalFile(os.path.join(path, 'metadata.html')))
+            return
+    web_view.setHtml(html)
+
+
 def css():
     global _css
     if _css is None:
@@ -603,7 +616,7 @@ class BookInfo(QWebView):
 
     def show_data(self, mi):
         html = render_html(mi, css(), self.vertical, self.parent())
-        self.setHtml(html)
+        set_html(mi, html, self)
 
     def mouseDoubleClickEvent(self, ev):
         swidth = self.page().mainFrame().scrollBarGeometry(Qt.Vertical).width()

src/calibre/gui2/comments_editor.py

@@ -72,6 +72,7 @@ class EditorWidget(QWebView):  # {{{
 
     def __init__(self, parent=None):
         QWebView.__init__(self, parent)
+        self.base_url = None
         self._parent = weakref.ref(parent)
         self.readonly = False
 
@@ -370,10 +371,17 @@ class EditorWidget(QWebView):  # {{{
             return ans
 
         def fset(self, val):
+            if self.base_url is None:
                 self.setHtml(val)
+            else:
+                self.setHtml(val, self.base_url)
             self.set_font_style()
         return property(fget=fget, fset=fset)
 
+    def set_base_url(self, qurl):
+        self.base_url = qurl
+        self.setHtml('', self.base_url)
+
     def set_html(self, val, allow_undo=True):
         if not allow_undo or self.readonly:
             self.html = val
@@ -650,6 +658,7 @@ class Editor(QWidget):  # {{{
             t = getattr(self, 'toolbar%d'%i)
             t.setIconSize(QSize(18, 18))
         self.editor = EditorWidget(self)
+        self.set_base_url = self.editor.set_base_url
         self.set_html = self.editor.set_html
         self.tabs = QTabWidget(self)
         self.tabs.setTabPosition(self.tabs.South)

src/calibre/gui2/custom_column_widgets.py

@@ -5,10 +5,11 @@ __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
+import os
 from functools import partial
 
 from PyQt5.Qt import (QComboBox, QLabel, QSpinBox, QDoubleSpinBox, QDateTimeEdit,
-        QDateTime, QGroupBox, QVBoxLayout, QSizePolicy, QGridLayout,
+        QDateTime, QGroupBox, QVBoxLayout, QSizePolicy, QGridLayout, QUrl,
         QSpacerItem, QIcon, QCheckBox, QWidget, QHBoxLayout, QLineEdit,
         QPushButton, QMessageBox, QToolButton, Qt, QPlainTextEdit)
 
@@ -315,6 +316,12 @@ class Comments(Base):
         self._box.setLayout(self._layout)
         self.widgets = [self._box]
 
+    def initialize(self, book_id):
+        path = self.db.abspath(book_id, index_is_id=True)
+        if path:
+            self._tb.set_base_url(QUrl.fromLocalFile(os.path.join(path, 'metadata.html')))
+        return Base.initialize(self, book_id)
+
     def setter(self, val):
         if not val or not val.strip():
             val = ''

src/calibre/gui2/dialogs/book_info.py

@@ -14,7 +14,7 @@ from PyQt5.QtWebKitWidgets import QWebView
 
 from calibre import fit_image
 from calibre.gui2 import NO_URL_FORMATTING, gprefs
-from calibre.gui2.book_details import css, details_context_menu_event, render_html
+from calibre.gui2.book_details import css, details_context_menu_event, render_html, set_html
 from calibre.gui2.ui import get_gui
 from calibre.gui2.widgets import CoverView
 from calibre.gui2.widgets2 import Dialog
@@ -275,7 +275,7 @@ class BookInfo(QDialog):
         self.cover_pixmap.setDevicePixelRatio(dpr)
         self.resize_cover()
         html = render_html(mi, self.css, True, self, pref_name='popup_book_display_fields')
-        self.details.setHtml(html)
+        set_html(mi, html, self.details)
         self.marked = mi.marked
         self.cover.setBackgroundBrush(self.marked_brush if mi.marked else self.normal_brush)
         self.update_cover_tooltip()

src/calibre/gui2/metadata/basic_widgets.py

@@ -15,7 +15,7 @@ from PyQt5.Qt import (
     QLabel, QGridLayout, QApplication, QDoubleSpinBox, QListWidgetItem, QSize,
     QPixmap, QDialog, QMenu, QLineEdit, QSizePolicy, QKeySequence,
     QDialogButtonBox, QAction, QCalendarWidget, QDate, QDateTime, QUndoCommand,
-    QUndoStack, QVBoxLayout, QPlainTextEdit)
+    QUndoStack, QVBoxLayout, QPlainTextEdit, QUrl)
 
 from calibre.gui2.widgets import EnLineEdit, FormatList as _FormatList, ImageView
 from calibre.gui2.widgets2 import access_key, populate_standard_spinbox_context_menu, RightClickButton, Dialog, RatingEditor
@@ -1247,6 +1247,9 @@ class CommentsEdit(Editor, ToMetadataMixin):  # {{{
         return property(fget=fget, fset=fset)
 
     def initialize(self, db, id_):
+        path = db.abspath(id_, index_is_id=True)
+        if path:
+            self.set_base_url(QUrl.fromLocalFile(os.path.join(path, 'metadata.html')))
         self.current_val = db.comments(id_, index_is_id=True)
         self.original_val = self.current_val