Content server: Book details view: Make calibre://show-book and calibre://view-book URLs in the comments work

src/pyj/book_list/book_details.pyj

@@ -14,7 +14,7 @@ from book_list.library_data import (
     current_virtual_library, download_url, library_data, load_status,
     set_book_metadata, download_data_file_url
 )
-from book_list.router import back, home, open_book, report_a_load_failure, show_note
+from book_list.router import back, home, open_book, report_a_load_failure, show_note, open_book_url_in_library
 from book_list.theme import (
     color_scheme, get_color, get_color_as_rgba, get_font_size
 )
@@ -155,6 +155,49 @@ def add_stars_to(stars, val, allow_half_stars):
 if window?:
     window.addEventListener('resize', debounce(adjust_all_iframes, 250))
 
+
+def replace_calibre_links_to_books(html):
+    parser = v'new DOMParser()'
+    dom = parser.parseFromString(html, 'text/html')
+    changed = False
+    dom.body.querySelectorAll('a[href]').forEach(def (link):
+        nonlocal changed
+        if not link.href:
+            return
+        if link.href.startswith('calibre://'):
+            url = v'new URL(link.href, window.location.origin)'
+            if url.hostname is not 'show-book' and url.hostname is not 'view-book':
+                return
+            path = url.pathname
+            parts = str.split(path, '/')
+            lib, book_id = parts[1], parts[2]
+            try:
+                book_id = int(book_id)
+            except:
+                return
+            if lib.startswith('_hex_-'):
+                lib = lib[6:]
+                v'const uint8Array = new Uint8Array(lib.match(/.{1,2}/g).map(byte => parseInt(byte, 16)));'
+                v'lib = new TextDecoder("utf-8").decode(uint8Array);'
+            if url.hostname is 'show-book':
+                new_href = query_as_href({'book_id': book_id + '', 'library_id': lib}, 'book_details')
+            else:
+                fmt = parts[3]
+                extra_query = {}
+                url.searchParams.forEach(def(val, key):
+                    extra_query[key] = val
+                )
+                new_href = open_book_url_in_library(lib, book_id, fmt, extra_query)
+                if url.search:
+                    new_href
+            link.href = new_href
+            changed = True
+    )
+    if not changed:
+        return html
+    return v'new XMLSerializer().serializeToString(dom);'
+
+
 def adjusting_sandboxed_html(html, extra_css):
     color = get_color_as_rgba('window-foreground')
     css =  f'\n\n:root {{ color-scheme: {color_scheme()} }}\n\nhtml, body {{ overflow: hidden; color: rgba({color[0]}, {color[1]}, {color[2]}, {color[3]}) }}'
@@ -445,7 +488,7 @@ def render_metadata(mi, table, book_id, iframe_css):  # {{{
                 name = fm.name or field
                 all_html += f'<h3>{name}</h3>'
             all_html += comment
-    iframe = adjusting_sandboxed_html(all_html, iframe_css)
+    iframe = adjusting_sandboxed_html(replace_calibre_links_to_books(all_html), iframe_css)
     iframe.style.marginTop = '2ex'
     table.parentNode.appendChild(iframe)
 # }}}

src/pyj/book_list/router.pyj

@@ -76,17 +76,20 @@ def open_book(book_id, fmt, library_id=None, replace=False, extra_query=None):
     push_state(q, replace=replace, mode=read_book_mode)
 
 
-def open_book_url(book_id, fmt, extra_query):
-    lid = current_library_id()
+def open_book_url_in_library(library_id, book_id, fmt, extra_query):
     ans = absolute_path('')
     q = {'book_id':book_id, 'fmt':fmt, 'mode': read_book_mode}
-    if lid:
-        q.library_id = lid
+    if library_id:
+        q.library_id = library_id
     if extra_query:
         Object.assign(q, extra_query)
     return ans + encode_query(q, '#')
 
 
+def open_book_url(book_id, fmt, extra_query):
+    return open_book_url_in_library(current_library_id(), book_id, fmt, extra_query)
+
+
 def show_note(field, item_id, item_value, replace=False, library_id=None, close_action='back', panel='show_note'):
     lid = library_id or current_library_id()
     q = {'field': field, 'item':item_value + '', 'item_id': (item_id or '')+ '', 'panel': panel}