There's currently no easy way to see which darcs patches have been processed to
support a changelog entry, since they are scattered throughout many files in a
directory. I would like a tool that reports the following

"show me all patches that have not been changelogged"

It should support a "--from-tag" option, and ideally would already produce
output in the changelog format. For example, if the patch name was all one one
line, it would use "match: exact", while multi-line patches would output in
"match name" format. (I assume that "exact" can't be used with multi-line patches).

I started looking at this, since I probably have contributed a
great deal to the change log entry fragmentation, but I don't
have time to finish it.

In src/make_changelog.hs the patches with no matching entries
can be retrieved with something like (tested and looks like
working):

  let foo = filter (\p -> not $ any (`apply_matcher` p) allpatterns) history where allpatterns = concat $ map fst entries

This will wrongly filter out also all tags, and it doesn't stop
at any --from-foo, and it doesn't print anything. Well, "putStr
$ show $ map info foo" will print a non-human-friendly list. I
guess importing Darcs.Patch.Info( human_friendly ) might be a
good idea.

The following patch updated the status of issue705 to be resolved:

* Resolve issue705: warn about patches which are not changelogged. 
Mostly by Tommy Pettersson.