zeroinstall/cmd/whatchanged.py

   1 """
   2 The B{0install whatchanged} command-line interface.
   3 """
   4
   5 # Copyright (C) 2012, Thomas Leonard
   6 # See the README file for details, or visit http://0install.net.
   7
   8 from __future__ import print_function
   9
  10 import os
  11
  12 from zeroinstall import _, SafeException
  13 from zeroinstall.cmd import UsageError
  14
  15 syntax = "APP-NAME"
  16
  17 def add_options(parser):
  18         parser.add_option("", "--full", help=_("show diff of the XML"), action='store_true')
  19
  20 def handle(config, options, args):
  21         if len(args) != 1:
  22                 raise UsageError()
  23
  24         name = args[0]
  25         app = config.app_mgr.lookup_app(name, missing_ok = False)
  26         history = app.get_history()
  27
  28         if not history:
  29                 raise SafeException(_("Invalid application: no selections found! Try '0install destroy {name}'").format(name = name))
  30
  31         import time
  32
  33         last_checked = app.get_last_checked()
  34         if last_checked is not None:
  35                 print(_("Last checked    : {date}").format(date = time.ctime(last_checked)))
  36
  37         last_attempt = app.get_last_check_attempt()
  38         if last_attempt is not None:
  39                 print(_("Last attempted update: {date}").format(date = time.ctime(last_attempt)))
  40
  41         print(_("Last update     : {date}").format(date = history[0]))
  42         current_sels = app.get_selections(snapshot_date = history[0])
  43
  44         if len(history) == 1:
  45                 print(_("No previous history to compare against."))
  46                 print(_("Use '0install select {name}' to see the current selections.").format(name = name))
  47                 return
  48
  49         print(_("Previous update : {date}").format(date = history[1]))
  50
  51         def get_selections_path(date):
  52                 return os.path.join(app.path, 'selections-{date}.xml'.format(date = date))
  53
  54         print()
  55
  56         if options.full:
  57                 import difflib, sys
  58                 def load_lines(date):
  59                         with open(get_selections_path(date), 'r') as stream:
  60                                 return stream.readlines()
  61                 old_lines = load_lines(history[1])
  62                 new_lines = load_lines(history[0])
  63                 for line in difflib.unified_diff(old_lines, new_lines, fromfile = history[1], tofile = history[0]):
  64                         sys.stdout.write(line)
  65         else:
  66                 changes = show_changes(app.get_selections(snapshot_date = history[1]).selections, current_sels.selections)
  67                 if not changes:
  68                         print(_("No changes to versions (use --full to see all changes)."))
  69
  70         print()
  71         print(_("To run using the previous selections, use:"))
  72         print("0install run {path}".format(path = get_selections_path(history[1])))
  73
  74 def show_changes(old_selections, new_selections):
  75         changes = False
  76
  77         for iface, old_sel in old_selections.items():
  78                 new_sel = new_selections.get(iface, None)
  79                 if new_sel is None:
  80                         print(_("No longer used: %s") % iface)
  81                         changes = True
  82                 elif old_sel.version != new_sel.version:
  83                         print(_("%s: %s -> %s") % (iface, old_sel.version, new_sel.version))
  84                         changes = True
  85
  86         for iface, new_sel in new_selections.items():
  87                 if iface not in old_selections:
  88                         print(_("%s: new -> %s") % (iface, new_sel.version))
  89                         changes = True
  90
  91         return changes