xsetbg_db.py

   1 #! /usr/bin/env python
   2 """XSetBg database
   3
   4 """
   5
   6 __author__ = "Oleg Broytman <phd@phdru.name>"
   7 __copyright__ = "Copyright (C) 2014, 2015 PhiloSoft Design"
   8 __license__ = "GNU GPL"
   9
  10 __all__ = ['xsetbg_db_path', 'xsetbg_db']
  11
  12 import os
  13 from sqlobject import SQLObject, connectionForURI, sqlhub, \
  14     StringCol, UnicodeCol, IntCol, BoolCol, DatabaseIndex, dberrors, \
  15     SQLObjectNotFound
  16 from xsetbg_conf import xsetbg_conf
  17
  18
  19 class SqliteSequence(SQLObject):
  20     class sqlmeta:
  21         idName = 'rowid'
  22     name = StringCol(unique=True)
  23     seq = IntCol()
  24
  25
  26 class XSetBg(SQLObject):
  27     full_name = UnicodeCol(alternateID=True)
  28     last_shown = IntCol(default=None)  # timestamp
  29     flag = BoolCol(default=None)
  30
  31     last_shown_idx = DatabaseIndex('last_shown')
  32     flag_idx = DatabaseIndex('flag')
  33
  34     def clearTable(self):
  35         super.clearTable(XSetBg, self)
  36         try:
  37             seq = SqliteSequence.byName(XSetBg.sqlmeta.table)
  38         except SQLObjectNotFound:
  39             SqliteSequence(name=XSetBg.sqlmeta.table, seq=0)
  40         else:
  41             seq.seq = 0  # Reset autoincrement counter
  42
  43
  44 def recreate_db():
  45     global xsetbg_db
  46     if xsetbg_db:
  47         xsetbg_db.clearTable()
  48     else:
  49         xsetbg_db = XSetBg
  50         xsetbg_db.createTable()
  51     return xsetbg_db
  52
  53
  54 db_dirs = []
  55 try:
  56     xsetbg_db_path = xsetbg_conf.get('xsetbg', 'database')
  57 except:
  58     xsetbg_db_path = None
  59
  60 if not xsetbg_db_path:
  61     if 'XDG_CACHE_HOME' in os.environ:
  62         db_dirs.append(os.environ['XDG_CACHE_HOME'])
  63     home_cache = os.path.expanduser('~/.cache')
  64     if home_cache not in db_dirs:
  65         db_dirs.append(home_cache)
  66     db_dirs.append(os.path.dirname(os.path.abspath(__file__)))
  67
  68     for d in db_dirs:
  69         xsetbg_db_path = os.path.join(d, 'xsetbg.sqlite')
  70         if os.path.exists(xsetbg_db_path):
  71             break
  72
  73 if xsetbg_db_path:
  74     sqlhub.processConnection = \
  75         connectionForURI('sqlite:///%s' % xsetbg_db_path)
  76     try:
  77         XSetBg.select()[0]
  78     except IndexError:
  79         xsetbg_db = XSetBg  # Table exists but is empty
  80     except dberrors.Error:
  81         xsetbg_db = None
  82     else:
  83         xsetbg_db = XSetBg
  84 else:
  85     xsetbg_db = None
  86
  87 if __name__ == '__main__':
  88     print "DB dirs:", db_dirs
  89     print "DB file:", xsetbg_db_path