git-am: suggest what to do with superfluous patches

[git.git] / git-am.sh

diff --git a/git-am.sh b/git-am.sh
index 50a292a7da58aab3b5ce62347b02dee35395da2a..43ea52c15c3031bd12e86df4016fb35efaf05e5d 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -593,6 +593,7 @@ do
                        echo "Patch is empty.  Was it split wrong?"
                        stop_here $this
                }
+               rm -f "$dotest/original-commit"
                if test -f "$dotest/rebasing" &&
                        commit=$(sed -e 's/^From \([0-9a-f]*\) .*/\1/' \
                                -e q "$dotest/$msgnum") &&
@@ -600,6 +601,7 @@ do
                then
                        git cat-file commit "$commit" |
                        sed -e '1,/^$/d' >"$dotest/msg-clean"
+                       echo "$commit" > "$dotest/original-commit"
                else
                        {
                                sed -n '/^Subject/ s/Subject: //p' "$dotest/info"
@@ -724,6 +726,8 @@ do
                resolved=
                git diff-index --quiet --cached HEAD -- && {
                        echo "No changes - did you forget to use 'git add'?"
+                       echo "If there is nothing left to stage, chances are that something else"
+                       echo "already introduced the same changes; you might want to skip this patch."
                        stop_here_user_resolve $this
                }
                unmerged=$(git ls-files -u)
@@ -738,7 +742,7 @@ do
                ;;
        esac
 
-       if test $apply_status = 1 && test "$threeway" = t
+       if test $apply_status != 0 && test "$threeway" = t
        then
                if (fall_back_3way)
                then
@@ -783,6 +787,10 @@ do
        git update-ref -m "$GIT_REFLOG_ACTION: $FIRSTLINE" HEAD $commit $parent ||
        stop_here $this
 
+       if test -f "$dotest/original-commit"; then
+               echo "$(cat "$dotest/original-commit") $commit" >> "$dotest/rewritten"
+       fi
+
        if test -x "$GIT_DIR"/hooks/post-applypatch
        then
                "$GIT_DIR"/hooks/post-applypatch
@@ -791,5 +799,12 @@ do
        go_next
 done
 
+if test -s "$dotest"/rewritten; then
+    git notes copy --for-rewrite=rebase < "$dotest"/rewritten
+    if test -x "$GIT_DIR"/hooks/post-rewrite; then
+       "$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
+    fi
+fi
+
 rm -fr "$dotest"
 git gc --auto