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authorJacob Keller <jacob.keller@gmail.com>2017-02-03 20:28:33 (GMT)
committerJunio C Hamano <gitster@pobox.com>2017-02-04 06:31:47 (GMT)
commit7326451bedaa67d29afe02184b166e28d9393c91 (patch)
tree9df2ca286dfa57669523b0043c545c67556f6622 /Documentation/git-reset.txt
parent6e3a7b3398559305c7a239a42e447c21a8f39ff8 (diff)
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reset: add an example of how to split a commit into two
It is often useful to break a commit into multiple parts that are more logical separations. This can be tricky to learn how to do without the brute-force method if re-writing code or commit messages from scratch. Add a section to the git-reset documentation which shows an example process for how to use git add -p and git commit -c HEAD@{1} to interactively break a commit apart and re-use the original commit message as a starting point when making the new commit message. Signed-off-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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diff --git a/Documentation/git-reset.txt b/Documentation/git-reset.txt
index 25432d9..add6220 100644
--- a/Documentation/git-reset.txt
+++ b/Documentation/git-reset.txt
@@ -292,6 +292,44 @@ $ git reset --keep start <3>
<3> But you can use "reset --keep" to remove the unwanted commit after
you switched to "branch2".
+Split a commit into two::
++
+Suppose that you have created a commit, but later decide that you want to break
+apart the changes into two logical chunks and commit each separately. You want
+to include part of the original commit into the first commit, while including
+the remainder in a second commit. You can use git reset to rewind the history
+without changing the index, and then use git add -p to interactively select
+which hunks to put into the first commit.
++
+------------
+$ git reset HEAD^ <1>
+$ git add -p <2>
+$ git diff --cached <3>
+$ git commit -c HEAD@{1} <4>
+...
+$ git add ... <5>
+$ git diff --cached <6>
+$ git commit ... <7>
+------------
++
+<1> First, reset the history back one commit so that we remove the original
+ commit, but leave the working tree with all the changes.
+<2> Now, interactively select hunks to add to a new commit using git add -p.
+ This will ask for each hunk separately and you can use simple commands like
+ "yes, include", "no don't include" or even "edit".
+<3> Once satisfied with the hunks, you should verify that it is what you
+ expected by using git diff --cached to show all changes in the index.
+<4> Next, commit the changes stored in the index. "-c" specifies to load the
+ editor with a commit message from a previous commit so that you can re-use the
+ original commit message. HEAD@{1} is special notation to reference what
+ HEAD used to be prior to the reset command. See linkgit:git-reflog[1] for
+ more details.
+<5> Now you've created the first commit, and can repeat steps 2-4 as often as
+ you like to break the work into any number of commits. Here we show a second
+ step which simply adds the remaining changes.
+<6> Then check again that the changes are what you expected to add.
+<7> And finally commit the remaining changes.
+
DISCUSSION
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