[darcs-devel] [patch1611] refactored convert darcs-2 command

[Ben Franksen]

New submission from Ben Franksen <ben.franksen at online.de>:

Author: Ben Franksen <ben.franksen at online.de>
Date:   Fri Sep 29 22:09:08 CEST 2017
  * refactored convert darcs-2 command
  
  There is no need to merge anything when converting, we can just add the
  patches to the new repo, committing our changes every 100 patches like we
  did before.
  
  To get the types right was a challenge. I added checkRepoIsNoRebase to
  Darcs.Repository.Job so as not to pollute the command implementation
with a
  host of obscure singleton types. Using foldFL_M requires two separate
  newtype wrappers (W2 and W3) because the procedures we want to fold
  simultaneously change two and three witnesses, respectively, and not just
  the last one. It may be possible to encapsulate this somehow, but I leave
  that to future refactorings. In spite of all that effort, we still need to
  coerce the repo parameter in two places, which I extensively
documented: one
  to work around the types of finalizeRepositoryChanges and
  revertRepositoryChanges (which are not precise enough) and another one to
  work around the type of withRepoLock (which is too restrictive).

----------
files: refactored-convert-darcs_2-command.dpatch
messages: 19696
nosy: bf
status: needs-screening
title: refactored convert darcs-2 command

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Darcs bug tracker <bugs at darcs.net>
<http://bugs.darcs.net/patch1611>
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