diff - Python watchdog: what is the 'empty' directory snapshot? -

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watchdog pretty awesome @ letting take recursive snapshots of particular directory. lets compare snapshots function called directorysnapshotdiff.

my program watches directory evolves in real-time, , has been made consume output of function. reasonable.

let's take snapshots s1, s2... of file system @ arbitrary times. compare last snapshot latest 1 create difference objects.

        d1    d2           # detected differences (my app eats these up)      s1 -> s2 -> s3        # evolving states (snapshots taken) of file system.  t=0 -------------------> time

omnomnomnom. that's great.

but, first time run app, need know current state. want pretend there null state s0, transitions s1; can diff format. i.e.

     d0                # want create 'bootstrapping' difference set (s0) -> s1             # assume s0 empty snapshot: reports addition

how do that?

the motivation behind is: love functional programming. instead of writing code consume snapshots , snapshot diffs (both considerable work) keep reuse high , code minimal.

for versions of python >= 2.6 watchdog uses it's orderedset.

modify fatuhoku's paths function follows;

@property def paths(self):     if sys.version_info >= (2, 6, 0):         return watchdog.utils.bricks.orderedset()     return set()

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