E-book viewer: When exporting highlights, add a new Markdown export type, where the date of the highlight becomes a link to open the book in calibre showing the highlight

src/calibre/gui2/library/annotations.py

@@ -7,11 +7,13 @@ import json
 import os
 from functools import partial
 from PyQt5.Qt import (
-    QApplication, QCheckBox, QComboBox, QCursor, QDateTime, QFont, QFormLayout, QDialog,
+    QAbstractItemView, QApplication, QCheckBox, QComboBox, QCursor, QDateTime,
-    QHBoxLayout, QIcon, QKeySequence, QLabel, QMenu, QPalette, QPlainTextEdit, QSize,
+    QDialog, QDialogButtonBox, QFont, QFormLayout, QFrame, QHBoxLayout, QIcon,
-    QSplitter, Qt, QTextBrowser, QTimer, QToolButton, QTreeWidget, QTreeWidgetItem, QFrame,
+    QKeySequence, QLabel, QMenu, QPalette, QPlainTextEdit, QSize, QSplitter, Qt,
-    QVBoxLayout, QWidget, pyqtSignal, QAbstractItemView, QDialogButtonBox
+    QTextBrowser, QTimer, QToolButton, QTreeWidget, QTreeWidgetItem, QVBoxLayout,
+    QWidget, pyqtSignal
 )
+from urllib.parse import quote
 
 from calibre import prepare_string_for_xml
 from calibre.ebooks.metadata import authors_to_string, fmt_sidx
@@ -22,25 +24,40 @@ from calibre.gui2.widgets2 import Dialog
 
 
 # rendering {{{
-def render_highlight_as_text(hl, lines):
+
+def render_highlight_as_text(hl, lines, as_markdown=False, link_prefix=None):
     lines.append(hl['highlighted_text'])
     date = QDateTime.fromString(hl['timestamp'], Qt.DateFormat.ISODate).toLocalTime().toString(Qt.DateFormat.SystemLocaleShortDate)
+    if as_markdown and link_prefix:
+        cfi = hl['start_cfi']
+        spine_index = (1 + hl['spine_index']) * 2
+        link = (link_prefix + quote(f'epubcfi(/{spine_index}{cfi})')).replace(')', '%29')
+        date = f'[{date}]({link})'
     lines.append(date)
     notes = hl.get('notes')
     if notes:
         lines.append('')
         lines.append(notes)
     lines.append('')
-    lines.append('───')
+    if as_markdown:
+        lines.append('-' * 20)
+    else:
+        lines.append('───')
     lines.append('')
 
 
-def render_bookmark_as_text(b, lines):
+def render_bookmark_as_text(b, lines, as_markdown=False, link_prefix=None):
     lines.append(b['title'])
     date = QDateTime.fromString(b['timestamp'], Qt.DateFormat.ISODate).toLocalTime().toString(Qt.DateFormat.SystemLocaleShortDate)
+    if as_markdown and link_prefix and b['pos_type'] == 'epubcfi':
+        link = (link_prefix + quote(b['pos'])).replace(')', '%29')
+        date = f'[{date}]({link})'
     lines.append(date)
     lines.append('')
-    lines.append('───')
+    if as_markdown:
+        lines.append('-' * 20)
+    else:
+        lines.append('───')
     lines.append('')
 
 
@@ -115,6 +132,7 @@ class Export(Dialog):  # {{{
         self.l = l = QFormLayout(self)
         self.export_format = ef = QComboBox(self)
         ef.addItem(_('Plain text'), 'txt')
+        ef.addItem(_('Markdown'), 'md')
         ef.addItem(*self.file_type_data())
         idx = ef.findData(self.prefs[self.pref_name])
         if idx > -1:
@@ -151,7 +169,8 @@ class Export(Dialog):  # {{{
             self.accept()
 
     def exported_data(self):
-        if self.export_format.currentData() == 'calibre_annotation_collection':
+        fmt = self.export_format.currentData()
+        if fmt == 'calibre_annotation_collection':
             return json.dumps({
                 'version': 1,
                 'type': 'calibre_annotation_collection',
@@ -160,6 +179,10 @@ class Export(Dialog):  # {{{
         lines = []
         db = current_db()
         bid_groups = {}
+        as_markdown = fmt == 'md'
+        library_id = getattr(db, 'server_library_id', None)
+        if library_id:
+            library_id = '_hex_-' + library_id.encode('utf-8').hex()
         for a in self.annotations:
             bid_groups.setdefault(a['book_id'], []).append(a)
         for book_id, group in bid_groups.items():
@@ -167,10 +190,14 @@ class Export(Dialog):  # {{{
             lines.append('')
             for a in group:
                 atype = a['type']
+                if library_id:
+                    link_prefix = f'calibre://show-book/{library_id}/{book_id}/{a["format"]}?open_at='
+                else:
+                    link_prefix = None
                 if atype == 'highlight':
-                    render_highlight_as_text(a, lines)
+                    render_highlight_as_text(a, lines, as_markdown=as_markdown, link_prefix=link_prefix)
                 elif atype == 'bookmark':
-                    render_bookmark_as_text(a, lines)
+                    render_bookmark_as_text(a, lines, as_markdown=as_markdown, link_prefix=link_prefix)
             lines.append('')
         return '\n'.join(lines).strip()
 # }}}

src/calibre/gui2/viewer/__init__.py

@@ -3,3 +3,7 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
+def get_current_book_data(set_val=False):
+    if set_val is not False:
+        setattr(get_current_book_data, 'ans', set_val)
+    return getattr(get_current_book_data, 'ans', {})

src/calibre/gui2/viewer/highlights.py

@@ -23,6 +23,7 @@ from calibre.gui2.dialogs.confirm_delete import confirm
 from calibre.gui2.library.annotations import (
     Details, Export as ExportBase, render_highlight_as_text, render_notes
 )
+from calibre.gui2.viewer import get_current_book_data
 from calibre.gui2.viewer.config import vprefs
 from calibre.gui2.viewer.search import SearchInput
 from calibre.gui2.viewer.shortcuts import get_shortcut_for, index_to_key_sequence
@@ -130,15 +131,31 @@ class Export(ExportBase):
         return _('highlights')
 
     def exported_data(self):
-        if self.export_format.currentData() == 'calibre_highlights':
+        cbd = get_current_book_data()
+        link_prefix = library_id = None
+        if 'calibre_library_id' in cbd:
+            library_id = cbd['calibre_library_id']
+            book_id = cbd['calibre_book_id']
+            book_fmt = cbd['calibre_book_fmt']
+        elif cbd.get('book_library_details'):
+            bld = cbd['book_library_details']
+            book_id = bld['book_id']
+            book_fmt = bld['fmt'].upper()
+            library_id = bld['library_id']
+        if library_id:
+            library_id = '_hex_-' + library_id.encode('utf-8').hex()
+            link_prefix = f'calibre://show-book/{library_id}/{book_id}/{book_fmt}?open_at='
+        fmt = self.export_format.currentData()
+        if fmt == 'calibre_highlights':
             return json.dumps({
                 'version': 1,
                 'type': 'calibre_highlights',
                 'highlights': self.annotations,
             }, ensure_ascii=False, sort_keys=True, indent=2)
         lines = []
+        as_markdown = fmt == 'md'
         for hl in self.annotations:
-            render_highlight_as_text(hl, lines)
+            render_highlight_as_text(hl, lines, as_markdown=as_markdown, link_prefix=link_prefix)
         return '\n'.join(lines).strip()
 
 

src/calibre/gui2/viewer/integration.py

@@ -7,6 +7,7 @@ import re
 
 
 def get_book_library_details(absolute_path_to_ebook):
+    from calibre.srv.library_broker import correct_case_of_last_path_component, library_id_from_path
     absolute_path_to_ebook = os.path.abspath(os.path.expanduser(absolute_path_to_ebook))
     base = os.path.dirname(absolute_path_to_ebook)
     m = re.search(r' \((\d+)\)$', os.path.basename(base))
@@ -14,11 +15,13 @@ def get_book_library_details(absolute_path_to_ebook):
         return
     book_id = int(m.group(1))
     library_dir = os.path.dirname(os.path.dirname(base))
+    corrected_path = correct_case_of_last_path_component(library_dir)
+    library_id = library_id_from_path(corrected_path)
     dbpath = os.path.join(library_dir, 'metadata.db')
     dbpath = os.environ.get('CALIBRE_OVERRIDE_DATABASE_PATH') or dbpath
     if not os.path.exists(dbpath):
         return
-    return {'dbpath': dbpath, 'book_id': book_id, 'fmt': absolute_path_to_ebook.rpartition('.')[-1].upper()}
+    return {'dbpath': dbpath, 'book_id': book_id, 'fmt': absolute_path_to_ebook.rpartition('.')[-1].upper(), 'library_id': library_id}
 
 
 def database_has_annotations_support(cursor):

src/calibre/gui2/viewer/ui.py

@@ -9,12 +9,12 @@ import re
 import sys
 from collections import defaultdict, namedtuple
 from hashlib import sha256
-from threading import Thread
-
 from PyQt5.Qt import (
-    QApplication, QCursor, QDockWidget, QEvent, QMenu, QMimeData, QModelIndex,
+    QApplication, QCursor, QDockWidget, QEvent, QMainWindow, QMenu, QMimeData,
-    QPixmap, Qt, QTimer, QToolBar, QUrl, QVBoxLayout, QWidget, pyqtSignal, QMainWindow
+    QModelIndex, QPixmap, Qt, QTimer, QToolBar, QUrl, QVBoxLayout, QWidget,
+    pyqtSignal
 )
+from threading import Thread
 
 from calibre import prints
 from calibre.constants import DEBUG
@@ -24,6 +24,7 @@ from calibre.gui2 import choose_files, error_dialog
 from calibre.gui2.dialogs.drm_error import DRMErrorMessage
 from calibre.gui2.image_popup import ImagePopup
 from calibre.gui2.main_window import MainWindow
+from calibre.gui2.viewer import get_current_book_data
 from calibre.gui2.viewer.annotations import (
     AnnotationsSaveWorker, annotations_dir, parse_annotations
 )
@@ -109,6 +110,7 @@ class EbookViewer(MainWindow):
         except EnvironmentError:
             pass
         self.current_book_data = {}
+        get_current_book_data(self.current_book_data)
         self.book_prepared.connect(self.load_finished, type=Qt.ConnectionType.QueuedConnection)
         self.dock_defs = dock_defs()
 
@@ -457,6 +459,7 @@ class EbookViewer(MainWindow):
         self.loading_overlay(_('Loading book, please wait'))
         self.save_annotations()
         self.current_book_data = {}
+        get_current_book_data(self.current_book_data)
         self.search_widget.clear_searches()
         t = Thread(name='LoadBook', target=self._load_ebook_worker, args=(pathtoebook, open_at, reload_book or self.force_reload))
         t.daemon = True
@@ -513,6 +516,7 @@ class EbookViewer(MainWindow):
             self.load_ebook(data['pathtoebook'], open_at=data['open_at'], reload_book=True)
             return
         self.current_book_data = data
+        get_current_book_data(self.current_book_data)
         self.current_book_data['annotations_map'] = defaultdict(list)
         self.current_book_data['annotations_path_key'] = path_key(data['pathtoebook']) + '.json'
         self.load_book_data(cbd)