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With this extension installed, Mercurial gains one new command: histedit. Usage
is as follows, assuming the following history::

 @  3[tip]   7c2fd3b9020c   2009-04-27 18:04 -0500   durin42
 |    Add delta
 |
 o  2   030b686bedc4   2009-04-27 18:04 -0500   durin42
 |    Add gamma
 |
 o  1   c561b4e977df   2009-04-27 18:04 -0500   durin42
 |    Add beta
 |
 o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
      Add alpha

If you were to run ``hg histedit c561b4e977df``, you would see the following
file open in your editor::

 pick c561b4e977df Add beta
 pick 030b686bedc4 Add gamma
 pick 7c2fd3b9020c Add delta

 # Edit history between c561b4e977df and 7c2fd3b9020c
 #
 # Commits are listed from least to most recent
 #
 # Commands:
 #  p, pick = use commit
 #  e, edit = use commit, but allow edits before making new commit
 #  f, fold = use commit, but combine it with the one above
 #  r, roll = like fold, but discard this commit's description and date
 #  d, drop = remove commit from history
 #  m, mess = edit commit message without changing commit content
 #  b, base = checkout changeset and apply further changesets from there
 #

In this file, lines beginning with ``#`` are ignored. You must specify a rule
for each revision in your history. For example, if you had meant to add gamma
before beta, and then wanted to add delta in the same revision as beta, you
would reorganize the file to look like this::

 pick 030b686bedc4 Add gamma
 pick c561b4e977df Add beta
 fold 7c2fd3b9020c Add delta

 # Edit history between c561b4e977df and 7c2fd3b9020c
 #
 # Commits are listed from least to most recent
 #
 # Commands:
 #  p, pick = use commit
 #  e, edit = use commit, but allow edits before making new commit
 #  f, fold = use commit, but combine it with the one above
 #  r, roll = like fold, but discard this commit's description and date
 #  d, drop = remove commit from history
 #  m, mess = edit commit message without changing commit content
 #  b, base = checkout changeset and apply further changesets from there
 #

At which point you close the editor and ``histedit`` starts working. When you
specify a ``fold`` operation, ``histedit`` will open an editor when it folds
those revisions together, offering you a chance to clean up the commit message::

 Add beta
 ***
 Add delta

Edit the commit message to your liking, then close the editor. The date used
for the commit will be the later of the two commits' dates. For this example,
let's assume that the commit message was changed to ``Add beta and delta.``
After histedit has run and had a chance to remove any old or temporary
revisions it needed, the history looks like this::

 @  2[tip]   989b4d060121   2009-04-27 18:04 -0500   durin42
 |    Add beta and delta.
 |
 o  1   081603921c3f   2009-04-27 18:04 -0500   durin42
 |    Add gamma
 |
 o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
      Add alpha

Note that ``histedit`` does *not* remove any revisions (even its own temporary
ones) until after it has completed all the editing operations, so it will
probably perform several strip operations when it's done. For the above example,
it had to run strip twice. Strip can be slow depending on a variety of factors,
so you might need to be a little patient. You can choose to keep the original
revisions by passing the ``--keep`` flag.

The ``edit`` operation will drop you back to a command prompt,
allowing you to edit files freely, or even use ``hg record`` to commit
some changes as a separate commit. When you're done, any remaining
uncommitted changes will be committed as well. When done, run ``hg
histedit --continue`` to finish this step. If there are uncommitted
changes, you'll be prompted for a new commit message, but the default
commit message will be the original message for the ``edit`` ed
revision, and the date of the original commit will be preserved.

The ``message`` operation will give you a chance to revise a commit
message without changing the contents. It's a shortcut for doing
``edit`` immediately followed by `hg histedit --continue``.

If ``histedit`` encounters a conflict when moving a revision (while
handling ``pick`` or ``fold``), it'll stop in a similar manner to
``edit`` with the difference that it won't prompt you for a commit
message when done. If you decide at this point that you don't like how
much work it will be to rearrange history, or that you made a mistake,
you can use ``hg histedit --abort`` to abandon the new changes you
have made and return to the state before you attempted to edit your
history.

If we clone the histedit-ed example repository above and add four more
changes, such that we have the following history::

   @  6[tip]   038383181893   2009-04-27 18:04 -0500   stefan
   |    Add theta
   |
   o  5   140988835471   2009-04-27 18:04 -0500   stefan
   |    Add eta
   |
   o  4   122930637314   2009-04-27 18:04 -0500   stefan
   |    Add zeta
   |
   o  3   836302820282   2009-04-27 18:04 -0500   stefan
   |    Add epsilon
   |
   o  2   989b4d060121   2009-04-27 18:04 -0500   durin42
   |    Add beta and delta.
   |
   o  1   081603921c3f   2009-04-27 18:04 -0500   durin42
   |    Add gamma
   |
   o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
        Add alpha

If you run ``hg histedit --outgoing`` on the clone then it is the same
as running ``hg histedit 836302820282``. If you need plan to push to a
repository that Mercurial does not detect to be related to the source
repo, you can add a ``--force`` option.

Config
------

Histedit rule lines are truncated to 80 characters by default. You
can customize this behavior by setting a different length in your
configuration file::

  [histedit]
  linelen = 120      # truncate rule lines at 120 characters

The summary of a change can be customized as well::

  [histedit]
  summary-template = '{rev} {bookmarks} {desc|firstline}'

The customized summary should be kept short enough that rule lines
will fit in the configured line length. See above if that requires
customization.

``hg histedit`` attempts to automatically choose an appropriate base
revision to use. To change which base revision is used, define a
revset in your configuration file::

  [histedit]
  defaultrev = only(.) & draft()

By default each edited revision needs to be present in histedit commands.
To remove revision you need to use ``drop`` operation. You can configure
the drop to be implicit for missing commits by adding::

  [histedit]
  dropmissing = True

By default, histedit will close the transaction after each action. For
performance purposes, you can configure histedit to use a single transaction
across the entire histedit. WARNING: This setting introduces a significant risk
of losing the work you've done in a histedit if the histedit aborts
unexpectedly::

  [histedit]
  singletransaction = True

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      included in destination. (See :hg:`help config.paths.default-push`)

    - Otherwise, the value from the "histedit.defaultrev" config option
      is used as a revset to select the base revision when ANCESTOR is not
      specified. The first revision returned by the revset is used. By
      default, this selects the editable history that is unique to the
      ancestry of the working directory.

    .. container:: verbose

       If you use --outgoing, this command will abort if there are ambiguous
       outgoing revisions. For example, if there are multiple branches
       containing outgoing revisions.

       Use "min(outgoing() and ::.)" or similar revset specification
       instead of --outgoing to specify edit target revision exactly in
       such ambiguous situation. See :hg:`help revsets` for detail about
       selecting revisions.

    .. container:: verbose

       Examples:

         - A number of changes have been made.
           Revision 3 is no longer needed.

           Start history editing from revision 3::

             hg histedit -r 3

           An editor opens, containing the list of revisions,
           with specific actions specified::

             pick 5339bf82f0ca 3 Zworgle the foobar
             pick 8ef592ce7cc4 4 Bedazzle the zerlog
             pick 0a9639fcda9d 5 Morgify the cromulancy

           Additional information about the possible actions
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           To remove revision 3 from the history,
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             drop 5339bf82f0ca 3 Zworgle the foobar
             pick 8ef592ce7cc4 4 Bedazzle the zerlog
             pick 0a9639fcda9d 5 Morgify the cromulancy

         - A number of changes have been made.
           Revision 2 and 4 need to be swapped.

           Start history editing from revision 2::

             hg histedit -r 2

           An editor opens, containing the list of revisions,
           with specific actions specified::

             pick 252a1af424ad 2 Blorb a morgwazzle
             pick 5339bf82f0ca 3 Zworgle the foobar
             pick 8ef592ce7cc4 4 Bedazzle the zerlog

           To swap revision 2 and 4, its lines are swapped
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             pick 8ef592ce7cc4 4 Bedazzle the zerlog
             pick 5339bf82f0ca 3 Zworgle the foobar
             pick 252a1af424ad 2 Blorb a morgwazzle

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