rebase -i: Introduce a constant AMEND

Add a constant AMEND holding the filename of the $DOTEST/amend file,
and document how this temporary file is used.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 17641d444ef536f96a342299846a78e4399c2648..31f9b3b038c5f535d4deaf2a507d336d128caa4d 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -80,6 +80,14 @@ DROPPED="$DOTEST"/dropped
 # being rebased.
 AUTHOR_SCRIPT="$DOTEST"/author-script
 
+# When an "edit" rebase command is being processed, the SHA1 of the
+# commit to be edited is recorded in this file.  When "git rebase
+# --continue" is executed, if there are any staged changes then they
+# will be amended to the HEAD commit, but only provided the HEAD
+# commit is still the commit to be edited.  When any other rebase
+# command is processed, this file is deleted.
+AMEND="$DOTEST"/amend
+
 PRESERVE_MERGES=
 STRATEGY=
 ONTO=
@@ -381,7 +389,7 @@ peek_next_command () {
 }
 
 do_next () {
-       rm -f "$MSG" "$AUTHOR_SCRIPT" "$DOTEST"/amend || exit
+       rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
        read command sha1 rest < "$TODO"
        case "$command" in
        '#'*|''|noop)
@@ -409,7 +417,7 @@ do_next () {
                pick_one $sha1 ||
                        die_with_patch $sha1 "Could not apply $sha1... $rest"
                make_patch $sha1
-               git rev-parse --verify HEAD > "$DOTEST"/amend
+               git rev-parse --verify HEAD > "$AMEND"
                warn "Stopped at $sha1... $rest"
                warn "You can amend the commit now, with"
                warn
@@ -587,10 +595,10 @@ do
                        . "$AUTHOR_SCRIPT" ||
                                die "Cannot find the author identity"
                        amend=
-                       if test -f "$DOTEST"/amend
+                       if test -f "$AMEND"
                        then
                                amend=$(git rev-parse --verify HEAD)
-                               test "$amend" = $(cat "$DOTEST"/amend) ||
+                               test "$amend" = $(cat "$AMEND") ||
                                die "\
 You have uncommitted changes in your working tree. Please, commit them
 first and then run 'git rebase --continue' again."