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histedit /

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histedit

Interactive history editing for Mercurial.

Warning: histedit alters history! It probably won't destroy your data, but that chance exists. You should never edit already-published history. Caveat Emptor. (You may want to use the --outgoing option to prevent editing unpushed history, though the changes may already be in another repository.)

Warning 2: If you drop a change, it's gone forever (unless you passed --keep). You've been warned!

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 633536316234 and 7c2fd3b9020c
#
# Commands:
#  p, pick = use commit
#  e, edit = use commit, but stop for amending
#  f, fold = use commit, but fold into previous commit
#  d, drop = remove commit from history
#
0 files updated, 0 files merged, 0 files removed, 0 files unresolved

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 633536316234 and 7c2fd3b9020c
#
# Commands:
#  p, pick = use commit
#  e, edit = use commit, but stop for amending
#  f, fold = use commit, but fold into previous commit
#  d, drop = remove commit from history
#
0 files updated, 0 files merged, 0 files removed, 0 files unresolved

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. 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. You'll be prompted for a new commit message, but the default commit message will be the original message for the edit ed revision.

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.

--outgoing

Interactive history editing only pushed changes.

If we clone the example repository above and add three 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.