convert: readd --filemap To handle merges correctly, this revision adds a filemap_source class that wraps a converter_source and does the work necessary to calculate the subgraph we're interested in. The wrapped converter_source must provide a new getchangedfiles method that, given a revision rev, and an index N, returns the list of files that are different in rev and its Nth parent. The implementation depends on the ability to skip some revisions and to change the parents field of the commit objects that we returned earlier. To make the conversion restartable, we assume the revisons in the revmapfile are topologically sorted.

--- a/hgext/convert/__init__.py
+++ b/hgext/convert/__init__.py
@@ -11,6 +11,7 @@ from darcs import darcs_source
 from git import convert_git
 from hg import mercurial_source, mercurial_sink
 from subversion import convert_svn, debugsvnlog
+import filemap
 
 import os, shutil
 from mercurial import hg, ui, util, commands
@@ -378,6 +379,10 @@ def convert(ui, src, dest=None, revmapfi
             shutil.rmtree(dest, True)
         raise
 
+    fmap = opts.get('filemap')
+    if fmap:
+        srcc = filemap.filemap_source(ui, srcc, fmap)
+
     if not revmapfile:
         try:
             revmapfile = destc.revmapfile()