def diff(suffix, resources, **switch):
"""
Iterates over 101diff input using the incremental101 library and calls the
given callbacks when appropriate. This handles changes in primary and
relevant derived resources incrementally.
Parameters
----------
suffix : string or list of string
Suffix(es) of the resources to be derived.
resources : list of resource
Resources that the current module depends on.
switch : dict of function(**kwargs)
A dict with callbacks with the keys "A", "M" and "D", for added,
modified and deleted files respecitvely. In practice, these are onfile
and ondelete in Deriver and Phase.
"""
primary = set()
derived = set()
for op, path in incremental101.eachdiff():
relative, kind = torelative(path, resources)
if not relative:
continue
todo_primary = relative not in primary
todo_derived = relative not in derived
if kind == PRIMARY:
if todo_primary and (op == "D" or todo_derived):
if op in switch:
handlepath(suffix, switch[op], relative)
primary.add(relative)
elif kind == DERIVED:
if todo_primary and todo_derived:
if "M" in switch:
handlepath(suffix, switch["M"], relative)
derived.add(relative)
from TAP.Simple import *
import incremental101 as inc
plan(2)
# we don't test nextdiff here
def monkeypatch():
global counter
counter -= 1 # Python doesn't have counter--,
return counter + 1 # so this hack will have to do.
inc.nextdiff = monkeypatch
counter = 5
values = [diff for diff in inc.eachdiff()]
eq_ok(values, [5, 4, 3, 2, 1], "eachdiff iterates over nextdiff's values")
counter = 0
values = [diff for diff in inc.eachdiff()]
eq_ok(values, [], "eachdiff with no values yields no values")
