view tests/test-lrucachedict.py @ 36200:deb851914fd7

dirstate: drop explicit files that shouldn't match (BC) (issue4679)

Before, wctx.walk() could include files excluded by -X pattern, which
disagrees with wctx.matches() and ctx.walk()/matches() behavior. This patch
fixes the problem by testing stat results against the matcher if the matcher
may contain false paths.

I have no idea if the fix should be made before the workaround for case-
insensitive filesystems, but that shouldn't matter since match.anypats()
means 'not match.isexact()'.

This patch also makes narrow and sparse extensions to not exclude explicit
paths on walk() because they appear to depend on the buggy behavior.

More detailed analysis about this issue by Martin von Zweigbergk:

"I think it's just an unintended consequence of how the dirstate walk works,
but I'm not sure. The exception for explicit files also bothered me when I
was working on the matcher code a year or so ago. I actually added the
exception to the matcher code because I thought it was always working like
that (not just for dirstate) in a83a7d27911e (match: handle excludes using
new differencematcher, 2017-05-16). It was only recently that Yuya realized
that it used to be inconsistent and that I probably made it consistently bad
because I didn't realize it was inconsistent to start with, see 821d8a5ab4ff
(match: do not weirdly include explicit files excluded by -X option,
2018-01-16)."

.. bc::

   Working-directory commands now respect ``-X PATTERN`` no matter if PATTERN
   matches explicitly-specified FILEs. For example, ``hg add foo -X foo`` no
   longer add the file ``foo``.

from __future__ import absolute_import, print_function

from mercurial import (
    util,
)

def printifpresent(d, xs, name='d'):
    for x in xs:
        present = x in d
        print("'%s' in %s: %s" % (x, name, present))
        if present:
            print("%s['%s']: %s" % (name, x, d[x]))

def test_lrucachedict():
    d = util.lrucachedict(4)
    d['a'] = 'va'
    d['b'] = 'vb'
    d['c'] = 'vc'
    d['d'] = 'vd'

    # all of these should be present
    printifpresent(d, ['a', 'b', 'c', 'd'])

    # 'a' should be dropped because it was least recently used
    d['e'] = 've'
    printifpresent(d, ['a', 'b', 'c', 'd', 'e'])

    assert d.get('a') is None
    assert d.get('e') == 've'

    # touch entries in some order (get or set).
    d['e']
    d['c'] = 'vc2'
    d['d']
    d['b'] = 'vb2'

    # 'e' should be dropped now
    d['f'] = 'vf'
    printifpresent(d, ['b', 'c', 'd', 'e', 'f'])

    d.clear()
    printifpresent(d, ['b', 'c', 'd', 'e', 'f'])

    # Now test dicts that aren't full.
    d = util.lrucachedict(4)
    d['a'] = 1
    d['b'] = 2
    d['a']
    d['b']
    printifpresent(d, ['a', 'b'])

    # test copy method
    d = util.lrucachedict(4)
    d['a'] = 'va3'
    d['b'] = 'vb3'
    d['c'] = 'vc3'
    d['d'] = 'vd3'

    dc = d.copy()

    # all of these should be present
    print("\nAll of these should be present:")
    printifpresent(dc, ['a', 'b', 'c', 'd'], 'dc')

    # 'a' should be dropped because it was least recently used
    print("\nAll of these except 'a' should be present:")
    dc['e'] = 've3'
    printifpresent(dc, ['a', 'b', 'c', 'd', 'e'], 'dc')

    # contents and order of original dict should remain unchanged
    print("\nThese should be in reverse alphabetical order and read 'v?3':")
    dc['b'] = 'vb3_new'
    for k in list(iter(d)):
        print("d['%s']: %s" % (k, d[k]))

if __name__ == '__main__':
    test_lrucachedict()