Code to get categories as JSON

src/calibre/srv/code.py

@@ -13,7 +13,7 @@ from calibre import prepare_string_for_xml, as_unicode
 from calibre.db.view import sanitize_sort_field_name
 from calibre.srv.ajax import get_db, search_result
 from calibre.srv.errors import HTTPNotFound, HTTPBadRequest
-from calibre.srv.metadata import book_as_json
+from calibre.srv.metadata import book_as_json, categories_as_json
 from calibre.srv.routes import endpoint, json
 from calibre.utils.icu import sort_key
 from calibre.utils.search_query_parser import ParseException
@@ -118,7 +118,7 @@ def interface_data(ctx, rd):
             sanitize_sort_field_name(db.field_metadata, k), v) for k, v in sf.iteritems()),
                                         key=lambda (field, name):sort_key(name))
         ans['field_metadata'] = db.field_metadata.all_metadata()
-        # ans['categories'] = ctx.get_categories(rd, db)
+        ans['categories'] = categories_as_json(ctx.get_categories(rd, db))
         mdata = ans['metadata'] = {}
         for book_id in ans['search_result']['book_ids']:
             data = book_as_json(db, book_id)

src/calibre/srv/metadata.py

@@ -7,6 +7,7 @@ from __future__ import (unicode_literals, division, absolute_import,
 from datetime import datetime, time
 
 from calibre.utils.date import isoformat, UNDEFINED_DATE, local_tz
+from calibre.utils.icu import sort_key, collation_order
 
 IGNORED_FIELDS = frozenset('cover ondevice path marked id au_map'.split())
 
@@ -41,3 +42,25 @@ def book_as_json(db, book_id):
             if field not in IGNORED_FIELDS:
                 add_field(field, db, book_id, ans, fm[field])
     return ans
+
+def category_item_as_json(x):
+    sname = x.sort or x.name
+    ans = {'sort_key': tuple(bytearray(sort_key(sname))), 'first_letter_sort_key': collation_order(icu_upper(sname or ' '))}
+    for k in x.__slots__:
+        if k != 'state':
+            val = getattr(x, k)
+            if isinstance(val, set):
+                val = tuple(val)
+            if val is not None:
+                ans[k] = val
+    if ans.get('sort', False) == ans['name']:
+        del ans['sort']
+    return ans
+
+def categories_as_json(categories):
+    ans = []
+    f = category_item_as_json
+    for category in sorted(categories, key=sort_key):
+        items = tuple(f(x) for x in categories[category])
+        ans.append((category, items))
+    return ans