implement metadata viewing/editing and basic PDF image extraction

dlibrary.py

@@ -150,7 +150,18 @@ def collate(args):
     con.close()
 
 def link_pdf(src, dest):
-    print(f'PDF support not yet implemented, skipping {src}')
+    with fitz.open(src) as pdf:
+        images_by_page = [page.get_images() for page in pdf]
+        if all(len(images) == 1 for images in images_by_page):
+            dest.mkdir(parents=True)
+            for (idx, images) in enumerate(images_by_page):
+                xref = images[0][0]
+                image = pdf.extract_image(xref)
+                file_path = dest / f'{idx:04d}.{image["ext"]}'
+                with open(file_path, 'wb') as f:
+                    f.write(image["image"])
+        else:
+            print(f'Support for weirder PDFs not yet implemented, skipping {src}')
 
 def complete_prefix_number_ordering(entries):
     matches = reversed(list(NUMBER_REGEX.finditer(entries[0].name)))
@@ -182,7 +193,32 @@ def link_ordered_files(ordering, dest):
         link_path.symlink_to(relpath(src_path, dest))
 
 def metadata(args):
-    pass
+    con = sqlite3.connect(args.destdir / 'meta.db')
+    cur = con.cursor()
+
+    if args.virtual is not None:
+        cur.execute("UPDATE works SET virtual = ? WHERE id = ?", (1 if args.virtual else 0, args.work_id))
+        con.commit()
+
+    res = cur.execute(
+        "SELECT title, circle, date, description, series, virtual FROM works WHERE id = ?",
+        (args.work_id,),
+    ).fetchone()
+
+    if res is None:
+        print(f'Work id {args.work_id} not found!')
+        return
+
+    (title, circle, date, description, series, virtual) = res
+    print(f'Work ID:     {args.work_id}')
+    print(f'Title:       {title}')
+    print(f'Circle:      {circle}')
+    print(f'Pub date:    {date}')
+    print(f'Description: {description}')
+    print(f'Series:      {series}')
+    print(f'Virtual:     {"Yes" if virtual == 1 else "No"}')
+
+    con.close()
 
 def publish(args):
     pass