fileset: add a lightweight file filtering language This patch was inspired by one that Jun Wu authored for the fb-experimental repo, to avoid using matcher for efficiency[1]. We want a way to specify what files will be converted to LFS at commit time. And per discussion, we also want to specify what files to skip, text diff, or merge in another config option. The current `lfs.threshold` config option could not satisfy complex needs. I'm putting it in a core package because Augie floated the idea of also using it for narrow and sparse. Yuya suggested farming out to fileset.parse(), which added support for more symbols. The only fileset element not supported here is 'negate'. (List isn't supported by filesets either.) I also changed the 'always' token to the 'all()' predicate for consistency, and introduced 'none()' to improve readability in a future tracked file based config. The extension operator was changed from '.' to '**', to match how recursive path globs are specified. Finally, I changed the path matcher from '/' to 'path:' at Yuya's suggestion, for consistency with matcher. Unfortunately, ':' is currently reserved in filesets, so this has to be quoted to be processed as a string instead of a symbol[2]. We should probably revisit that, because it's seriously ugly. But it's only used by an experimental extension, and I think using a file based config for LFS may drive some more tweaks, so I'm settling for this for now. I reserved all of the glob characters in fileset except '.' and '_' for the extension test because those are likely valid extension characters. Sample filter settings: all() # everything size(">20MB") # larger than 20MB !**.txt # except for .txt files **.zip | **.tar.gz | **.7z # some types of compressed files "path:bin" # files under "bin" in the project root [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-December/109387.html [2] https://www.mercurial-scm.org/pipermail/mercurial-devel/2018-January/109729.html

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#!/usr/bin/env python

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"""

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Tests the behavior of filelog w.r.t. data starting with '\1\n'

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"""

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from __future__ import absolute_import, print_function

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from mercurial.node import (

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    hex,

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    nullid,

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)

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from mercurial import (

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    hg,

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    ui as uimod,

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)

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myui = uimod.ui.load()

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repo = hg.repository(myui, path='.', create=True)

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fl = repo.file('foobar')

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def addrev(text, renamed=False):

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    if renamed:

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        # data doesn't matter. Just make sure filelog.renamed() returns True

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        meta = {'copyrev': hex(nullid), 'copy': 'bar'}

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    else:

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        meta = {}

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    lock = t = None

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    try:

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        lock = repo.lock()

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        t = repo.transaction('commit')

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        node = fl.add(text, meta, t, 0, nullid, nullid)

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        return node

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    finally:

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        if t:

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            t.close()

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        if lock:

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            lock.release()

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def error(text):

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    print('ERROR: ' + text)

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textwith = '\1\nfoo'

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without = 'foo'

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node = addrev(textwith)

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if not textwith == fl.read(node):

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    error('filelog.read for data starting with \\1\\n')

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if fl.cmp(node, textwith) or not fl.cmp(node, without):

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    error('filelog.cmp for data starting with \\1\\n')

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if fl.size(0) != len(textwith):

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    error('FIXME: This is a known failure of filelog.size for data starting '

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        'with \\1\\n')

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node = addrev(textwith, renamed=True)

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if not textwith == fl.read(node):

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    error('filelog.read for a renaming + data starting with \\1\\n')

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if fl.cmp(node, textwith) or not fl.cmp(node, without):

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    error('filelog.cmp for a renaming + data starting with \\1\\n')

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if fl.size(1) != len(textwith):

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    error('filelog.size for a renaming + data starting with \\1\\n')

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print('OK.')