--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext3rd/fastimport/__init__.py	Mon Jan 18 23:04:05 2021 +0000
@@ -0,0 +1,80 @@
+''' import Git fast-import streams '''
+from __future__ import absolute_import
+
+from mercurial import (
+    commands,
+    encoding,
+    error,
+    pycompat,
+)
+
+from mercurial.i18n import _
+
+from hgext.convert import (
+    convcmd,
+    hg,
+)
+
+from .hgimport import fastimport_source
+
+testedwith = b'5.6.1'
+minimumhgversion = b'4.1'
+
+cmdtable = {}
+try:
+    from mercurial import registrar
+    command = registrar.command(cmdtable)
+except (ImportError, AttributeError):
+    from mercurial import cmdutil
+    command = cmdutil.command(cmdtable)
+
+@command(b'fastimport',
+         [(b'', b'branchsort', None, _(b'try to sort changesets by branches')),
+          (b'', b'datesort', None, _(b'try to sort changesets by date')),
+          (b'', b'sourcesort', None, _(b'preserve source changesets order'))],
+         _(b'hg fastimport SOURCE ...'),
+          norepo=False)
+
+def fastimport(ui, repo, *sources, **opts):
+    '''Convert a git fastimport dump into Mercurial changesets.
+
+    Reads a series of SOURCE fastimport dumps and adds the resulting
+    changes to the current Mercurial repository.
+    '''
+    # Would be nice to just call hgext.convert.convcmd.convert() and let
+    # it take care of things.  But syntax and semantics are just a
+    # little mismatched:
+    #   - fastimport takes multiple source paths (mainly because cvs2git
+    #     produces 2 dump files)
+    #   - fastimport's dest is implicitly the current repo
+    #
+    # So for the time being, I have copied bits of convert() over here.
+    # Boo, hiss.
+
+    if not sources:
+        sources = (b'-')
+
+    # assume fastimport metadata (usernames, commit messages) are
+    # encoded UTF-8
+    convcmd.orig_encoding = encoding.encoding
+    encoding.encoding = b'UTF-8'
+
+    # sink is the current repo, src is the list of fastimport streams
+    destc = hg.mercurial_sink(ui, b'hg', repo.root)
+    srcc = fastimport_source(ui, b'fastimport', repo, sources)
+
+    opts = pycompat.byteskwargs(opts)
+    defaultsort = b'branchsort'          # for efficiency and consistency
+    sortmodes = (b'branchsort', b'datesort', b'sourcesort')
+    sortmode = [m for m in sortmodes if opts.get(m)]
+    if len(sortmode) > 1:
+        raise error.Abort(_(b'more than one sort mode specified'))
+    if sortmode:
+        sortmode = sortmode[0]
+    else:
+        sortmode = defaultsort
+
+    # not implemented: filemap, revmapfile
+    revmapfile = destc.revmapfile()
+    c = convcmd.converter(ui, srcc, destc, revmapfile, opts)
+    c.convert(sortmode)