Speed up import of device plugins

src/calibre/devices/apple/driver.py

@@ -8,21 +8,29 @@ __docformat__ = 'restructuredtext en'
 import cStringIO, ctypes, datetime, os, re, shutil, sys, tempfile, time
 
 from calibre.constants import __appname__, __version__, DEBUG
-from calibre import fit_image, confirm_config_name
+from calibre import fit_image, confirm_config_name, strftime as _strftime
 from calibre.constants import isosx, iswindows
 from calibre.devices.errors import OpenFeedback, UserFeedback
 from calibre.devices.usbms.deviceconfig import DeviceConfig
 from calibre.devices.interface import DevicePlugin
-from calibre.ebooks.BeautifulSoup import BeautifulSoup
 from calibre.ebooks.metadata import authors_to_string, MetaInformation, title_sort
 from calibre.ebooks.metadata.book.base import Metadata
-from calibre.ebooks.metadata.epub import set_metadata
-from calibre.library.server.utils import strftime
 from calibre.utils.config import config_dir, dynamic, prefs
 from calibre.utils.date import now, parse_date
 from calibre.utils.logging import Log
 from calibre.utils.zipfile import ZipFile
 
+def strftime(fmt='%Y/%m/%d %H:%M:%S', dt=None):
+
+    if not hasattr(dt, 'timetuple'):
+        dt = now()
+    dt = dt.timetuple()
+    try:
+        return _strftime(fmt, dt)
+    except:
+        return _strftime(fmt, now().timetuple())
+
+
 
 class AppleOpenFeedback(OpenFeedback):
 
@@ -1675,6 +1683,8 @@ class ITUNES(DriverBase):
     def _dump_epub_metadata(self, fpath):
         '''
         '''
+        from calibre.ebooks.BeautifulSoup import BeautifulSoup
+
         self.log.info(" ITUNES.__get_epub_metadata()")
         title = None
         author = None
@@ -2648,6 +2658,8 @@ class ITUNES(DriverBase):
     def _update_epub_metadata(self, fpath, metadata):
         '''
         '''
+        from calibre.ebooks.metadata.epub import set_metadata
+
         if DEBUG:
             self.log.info(" ITUNES._update_epub_metadata()")
 

src/calibre/devices/bambook/libbambookcore.py

@@ -8,7 +8,7 @@ __docformat__ = 'restructuredtext en'
 Sanda library wrapper
 '''
 
-import ctypes, uuid, hashlib, os, sys
+import ctypes, hashlib, os, sys
 from threading import Event, Lock
 from calibre.constants import iswindows
 from calibre import load_library
@@ -350,6 +350,7 @@ class Bambook:
         return None
 
     def SendFile(self, fileName, guid = None):
+        import uuid
         if self.handle:
             taskID = job.NewJob()
             if guid:

src/calibre/devices/kindle/apnx.py

@@ -9,7 +9,6 @@ Generates and writes an APNX page mapping file.
 '''
 
 import struct
-import uuid
 
 from calibre.ebooks.mobi.reader import MobiReader
 from calibre.ebooks.pdb.header import PdbHeaderReader
@@ -51,6 +50,7 @@ class APNXBuilder(object):
             apnxf.write(apnx)
 
     def generate_apnx(self, pages):
+        import uuid
         apnx = ''
 
         content_vals = {

src/calibre/devices/kindle/driver.py

@@ -10,10 +10,8 @@ Device driver for Amazon's Kindle
 
 import datetime, os, re, sys, json, hashlib
 
-from calibre.devices.kindle.apnx import APNXBuilder
 from calibre.devices.kindle.bookmark import Bookmark
 from calibre.devices.usbms.driver import USBMS
-from calibre.ebooks.metadata import MetaInformation
 from calibre import strftime
 
 '''
@@ -152,6 +150,7 @@ class KINDLE(USBMS):
         path_map, book_ext = resolve_bookmark_paths(storage, path_map)
 
         bookmarked_books = {}
+
         for id in path_map:
             bookmark_ext = path_map[id].rpartition('.')[2]
             myBookmark = Bookmark(path_map[id], id, book_ext[id], bookmark_ext)
@@ -236,6 +235,8 @@ class KINDLE(USBMS):
 
     def add_annotation_to_library(self, db, db_id, annotation):
         from calibre.ebooks.BeautifulSoup import Tag
+        from calibre.ebooks.metadata import MetaInformation
+
         bm = annotation
         ignore_tags = set(['Catalog', 'Clippings'])
 
@@ -363,6 +364,8 @@ class KINDLE2(KINDLE):
         '''
         Hijacking this function to write the apnx file.
         '''
+        from calibre.devices.kindle.apnx import APNXBuilder
+
         opts = self.settings()
         if not opts.extra_customization[self.OPT_APNX]:
             return

src/calibre/devices/prs505/sony_cache.py

@@ -7,8 +7,6 @@ __docformat__ = 'restructuredtext en'
 
 import os, time
 from base64 import b64decode
-from uuid import uuid4
-from lxml import etree
 from datetime import date
 
 from calibre import prints, guess_type, isbytestring
@@ -78,6 +76,7 @@ def strftime(epoch, zone=time.localtime):
     return ' '.join(src)
 
 def uuid():
+    from uuid import uuid4
     return str(uuid4()).replace('-', '', 1).upper()
 
 # }}}
@@ -85,6 +84,8 @@ def uuid():
 class XMLCache(object):
 
     def __init__(self, paths, ext_paths, prefixes, use_author_sort):
+        from lxml import etree
+
         if DEBUG:
             debug_print('Building XMLCache...', paths)
         self.paths = paths
@@ -714,6 +715,8 @@ class XMLCache(object):
 
 
     def write(self):
+        from lxml import etree
+
         for i, path in self.paths.items():
             self.move_playlists_to_bottom()
             self.cleanup_whitespace(i)

src/calibre/devices/usbms/driver.py

@@ -10,7 +10,7 @@ driver. It is intended to be subclassed with the relevant parts implemented
 for a particular device.
 '''
 
-import os, re, time, json, uuid, functools, shutil
+import os, re, time, json, functools, shutil
 from itertools import cycle
 
 from calibre.constants import numeric_version
@@ -58,6 +58,7 @@ class USBMS(CLI, Device):
     SCAN_FROM_ROOT = False
 
     def _update_driveinfo_record(self, dinfo, prefix, location_code, name=None):
+        import uuid
         if not isinstance(dinfo, dict):
             dinfo = {}
         if dinfo.get('device_store_uuid', None) is None: