comparison mercurial/revset.py @ 11944:df52ff0980fe

revset: predicate to avoid lookup errors

A query like

head() and (descendants("bad") and not descendants("fix"))

(testing if repo heads are affected by a bug) will abort with a
RepoLookupError if either badrev or fixrev aren't found inside
the repository, which is not very informative.

The new predicate returns an empty set for lookup errors, so

head() and (descendants(present("bad")) and not descendants(present("fix")))

will behave as wanted even if those revisions are not found.

11943:2d3cbcace897

def reverse(repo, subset, x):
    l = getset(repo, subset, x)
    l.reverse()
    return l

def sort(repo, subset, x):
    l = getargs(x, 1, 2, _("sort wants one or two arguments"))
    keys = "rev"
    if len(l) == 2:
        keys = getstring(l[1], _("sort spec must be a string"))

    "modifies": modifies,
    "outgoing": outgoing,
    "p1": p1,
    "p2": p2,
    "parents": parents,
    "removes": removes,
    "reverse": reverse,
    "roots": roots,
    "sort": sort,
    "tagged": tagged,

11944:df52ff0980fe

def reverse(repo, subset, x):
    l = getset(repo, subset, x)
    l.reverse()
    return l

def present(repo, subset, x):
    try:
        return getset(repo, subset, x)
    except error.RepoLookupError:
        return []

def sort(repo, subset, x):
    l = getargs(x, 1, 2, _("sort wants one or two arguments"))
    keys = "rev"
    if len(l) == 2:
        keys = getstring(l[1], _("sort spec must be a string"))

    "modifies": modifies,
    "outgoing": outgoing,
    "p1": p1,
    "p2": p2,
    "parents": parents,
    "present": present,
    "removes": removes,
    "reverse": reverse,
    "roots": roots,
    "sort": sort,
    "tagged": tagged,