This new version of the patch resolves issue #1241.
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Hello,

thanks for the solution !

Your patch didn't applied cleanly, there was a problem with hunk 2 of mercurial_adapter.rb.
Here is your patch with a few modifications :
* use of @to_s@ in @cmd << " -r " + (identifier ? identifier.to_s : "tip")@ (I think this line caused your patch to not apply).
* use of the same trick for cat and annotate, to be able to see files at a specific revision.

I tested on a Linux machine with Mercurial 1.0.
Could you test it again with both versions of Mercurial and on Windows ?

Patch apply to r1441 and also to r1420.
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This patch applies cleanly on the latest code. But it breaks this unit test: @test_fetch_changesets_from_scratch(RepositoryMercurialTest)@.
It looks like the commit message is truncated to the first line. I'm running hg 1.0 on win32.
Any idea?

Also I think that @MercurialAdapter.template_path@ is not accurate.
Here is my output of hg --version:

<pre>
Mercurial Distributed SCM (version 1e4ddc9ac9f7+20080325)

Copyright (C) 2005-2008 Matt Mackall <mpm@selenic.com> and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
</pre>

Maybe we could choose the 1.0 template if it doesn't match something like: @/version (\d+(\.\d+)*)/@ ?

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here is my output for hg --version. First is for .9.5, second is for 1.0. System is debianish, .9.5 is provided by distro repository, 1.0 is built from hg sources.

<pre> Mercurial Distributed SCM (version 0.9.5)</pre>
<pre> Mercurial Distributed SCM (version 1.0)</pre>

Jean Philippe, how did you get your copy of HG ?

By the way, a fallback as suggested is probably safe.
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The binary package of Mercurial for Windows is built from a snapshot and not from an official release. As a result, the version number provided by hg --version is the revision id of the compiled source.
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Here is a new patch that passes unit tests. In fact, all the commit messages where truncated.

Is there a way to obtain the repositories used for unit testing ?

I modified the behaviour for the template selection. If the version number is not a version number (ie it's not an official release), then the template1.0 is used. I asked the Mercurial packager for Windows why he don't use official releases.
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Pierre, the repository used for unit and functionnal tests can be found in @test/fixtures/repositories@.
Extract it into @tmp/test@ as documented in source:/trunk/doc/RUNNING_TESTS :

gunzip < test/fixtures/repositories/mercurial_repository.tar.gz | tar -xv -C tmp/test

I did not do a full review of your patch but tests are OK. Do you think it's ready for commit ?
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I made a new patch with a bit more unit tests. I think it can be commited now. The piece of code is in use for some days in our Redmine instance.
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Patch committed in r1499.
I made a small change in order to move the templates from @/extra@ to @/lib/redmine/scm/adapters/mercurial@ since the adapter depends on these files.
Thanks for your work.
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relates,Closed,1241,Mercurial : Don't browse latest version after a 'hg push'