comparison mercurial/metadata.py @ 45667:0303fc1f43f8

changing-files: add clean computation of changed files for linear changesets

The `files` field is not reliable, so we need to compute things from scratch. We
deal with the second simplest case, linear changesets. We diff the current
manifest with the parent manifest. This reveal the file added, changed and
removed.

Differential Revision: https://phab.mercurial-scm.org/D9127

45666:f6811e5bd994

    """compute the files changed by a revision"""
    p1 = ctx.p1()
    p2 = ctx.p2()
    if p1.rev() == node.nullrev and p2.rev() == node.nullrev:
        return _process_root(ctx)
    filescopies = computechangesetcopies(ctx)
    filesadded = computechangesetfilesadded(ctx)
    filesremoved = computechangesetfilesremoved(ctx)
    filesmerged = computechangesetfilesmerged(ctx)
    files = ChangingFiles()

    # Simple, there was nothing before it, so everything is added.
    md = ChangingFiles()
    manifest = ctx.manifest()
    for filename in manifest:
        md.mark_added(filename)
    return md


def computechangesetfilesadded(ctx):
    """return the list of files added in a changeset

45667:0303fc1f43f8

    """compute the files changed by a revision"""
    p1 = ctx.p1()
    p2 = ctx.p2()
    if p1.rev() == node.nullrev and p2.rev() == node.nullrev:
        return _process_root(ctx)
    elif p1.rev() != node.nullrev and p2.rev() == node.nullrev:
        return _process_linear(p1, ctx)
    elif p1.rev() == node.nullrev and p2.rev() != node.nullrev:
        # In the wild, one can encounter changeset where p1 is null but p2 is not
        return _process_linear(p1, ctx, parent=2)
    elif p1.rev() == p2.rev():
        # In the wild, one can encounter such "non-merge"
        return _process_linear(p1, ctx)
    filescopies = computechangesetcopies(ctx)
    filesadded = computechangesetfilesadded(ctx)
    filesremoved = computechangesetfilesremoved(ctx)
    filesmerged = computechangesetfilesmerged(ctx)
    files = ChangingFiles()

    # Simple, there was nothing before it, so everything is added.
    md = ChangingFiles()
    manifest = ctx.manifest()
    for filename in manifest:
        md.mark_added(filename)
    return md


def _process_linear(parent_ctx, children_ctx, parent=1):
    """compute the appropriate changed files for a changeset with a single parent
    """
    md = ChangingFiles()
    parent_manifest = parent_ctx.manifest()
    children_manifest = children_ctx.manifest()

    copies_candidate = []

    for filename, d in parent_manifest.diff(children_manifest).items():
        if d[1][0] is None:
            # no filenode for the "new" value, file is absent
            md.mark_removed(filename)
        else:
            copies_candidate.append(filename)
            if d[0][0] is None:
                # not filenode for the "old" value file was absent
                md.mark_added(filename)
            else:
                # filenode for both "old" and "new"
                md.mark_touched(filename)

    if parent == 1:
        copied = md.mark_copied_from_p1
    elif parent == 2:
        copied = md.mark_copied_from_p2
    else:
        assert False, "bad parent value %d" % parent

    for filename in copies_candidate:
        copy_info = children_ctx[filename].renamed()
        if copy_info:
            source, srcnode = copy_info
            copied(source, filename)

    return md


def computechangesetfilesadded(ctx):
    """return the list of files added in a changeset