Merge branch 'cm/rebase-i'

"rebase -i" is getting cleaned up and also enhanced.

* cm/rebase-i:
  doc/git-rebase: add documentation for fixup [-C|-c] options
  rebase -i: teach --autosquash to work with amend!
  t3437: test script for fixup [-C|-c] options in interactive rebase
  rebase -i: add fixup [-C | -c] command
  sequencer: use const variable for commit message comments
  sequencer: pass todo_item to do_pick_commit()
  rebase -i: comment out squash!/fixup! subjects from squash message
  sequencer: factor out code to append squash message
  rebase -i: only write fixup-message when it's needed

2 files changed, 72 insertions, 0 deletions

diff --git a/t/t3437/expected-combined-message b/t/t3437/expected-combined-message
new file mode 100644
index 0000000000..a26cfb2fa9
--- /dev/null
+++ b/t/t3437/expected-combined-message
@@ -0,0 +1,21 @@
+# This is a combination of 4 commits.
+# This is the 1st commit message:
+
+B
+
+# This is the commit message #2:
+
+# amend! B
+
+new subject
+
+new
+body
+
+# The commit message #3 will be skipped:
+
+# A2
+
+# This is the commit message #4:
+
+A3
diff --git a/t/t3437/expected-squash-message b/t/t3437/expected-squash-message
new file mode 100644
index 0000000000..ab2434f90e
--- /dev/null
+++ b/t/t3437/expected-squash-message
@@ -0,0 +1,51 @@
+# This is a combination of 6 commits.
+# The 1st commit message will be skipped:
+
+# B
+#
+# Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# The commit message #2 will be skipped:
+
+# fixup! B
+
+# The commit message #3 will be skipped:
+
+# amend! B
+#
+# B
+#
+# edited 1
+#
+# Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# This is the commit message #4:
+
+# amend! amend! B
+
+B
+
+edited 1
+
+edited 2
+
+Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# This is the commit message #5:
+
+# squash! amend! amend! B
+
+edited squash
+
+# This is the commit message #6:
+
+# amend! amend! amend! B
+
+B
+
+edited 1
+
+edited 2
+
+edited 3
+squashed