[Bug 5410] New: Add patch-editing support to `hg record`

[bugzilla at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5410

            Bug ID: 5410
           Summary: Add patch-editing support to `hg record`
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Windows
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: record
          Assignee: bugzilla at selenic.com
          Reporter: scovich at gmail.com
                CC: mercurial-devel at selenic.com

Created attachment 1939
  --> https://bz.mercurial-scm.org/attachment.cgi?id=1939&action=edit
Augmented record.py targeting mercurial-2.8

One very nice feature of git is the ability to edit patches in place (with a
suitable patch-enlightened editor) and commit the result rather than the code
that was actually in the working directory. This makes it vastly easier to
disentangle multiple code changes into separate commits.

I am attaching two versions of the record extension that implement this
feature: the first targets mercurial-2.8 that I have been using for several
years now, and the second is a lightly tested update for mercurial-3.7 that
works around the disappearance of the `mercurial.hg.revert()` function.

The augmented extension is reasonably well documented, using `-p` to request
patch editing. 

I know of two weaknesses that cause the commit to fail with an exception throw:

- file rename or copy operations
- some input diff contains a complaint about the lack of a newline

I have not attempted to address those weaknesses because they have not been
sufficiently annoying to be worth the trouble of figuring out.

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