compat: Add simplified merge sort implementation from glibc

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 47581ced5a862a8d21f09d096fe9b20507e27274..402ff3782c0aaa472a2013ff3a9bef44a6cd8550 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -73,14 +73,19 @@ comment_for_reflog () {
        esac
 }
 
+last_count=
 mark_action_done () {
        sed -e 1q < "$TODO" >> "$DONE"
        sed -e 1d < "$TODO" >> "$TODO".new
        mv -f "$TODO".new "$TODO"
        count=$(($(grep -ve '^$' -e '^#' < "$DONE" | wc -l)))
        total=$(($count+$(grep -ve '^$' -e '^#' < "$TODO" | wc -l)))
-       printf "Rebasing (%d/%d)\r" $count $total
-       test -z "$VERBOSE" || echo
+       if test "$last_count" != "$count"
+       then
+               last_count=$count
+               printf "Rebasing (%d/%d)\r" $count $total
+               test -z "$VERBOSE" || echo
+       fi
 }
 
 make_patch () {
@@ -215,15 +220,17 @@ make_squash_message () {
                COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
                        < "$SQUASH_MSG" | tail -n 1)+1))
                echo "# This is a combination of $COUNT commits."
-               sed -n "2,\$p" < "$SQUASH_MSG"
+               sed -e 1d -e '2,/^./{
+                       /^$/d
+               }' <"$SQUASH_MSG"
        else
                COUNT=2
                echo "# This is a combination of two commits."
                echo "# The first commit's message is:"
                echo
                git cat-file commit HEAD | sed -e '1,/^$/d'
-               echo
        fi
+       echo
        echo "# This is the $(nth_string $COUNT) commit message:"
        echo
        git cat-file commit $1 | sed -e '1,/^$/d'
@@ -363,17 +370,28 @@ do
 
                test -d "$DOTEST" || die "No interactive rebase running"
 
-               # commit if necessary
-               git rev-parse --verify HEAD > /dev/null &&
-               git update-index --refresh &&
-               git diff-files --quiet &&
-               ! git diff-index --cached --quiet HEAD -- &&
-               . "$DOTEST"/author-script && {
-                       test ! -f "$DOTEST"/amend || git reset --soft HEAD^
-               } &&
-               export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
-               git commit --no-verify -F "$DOTEST"/message -e ||
+               # Sanity check
+               git rev-parse --verify HEAD >/dev/null ||
+                       die "Cannot read HEAD"
+               git update-index --refresh && git diff-files --quiet ||
+                       die "Working tree is dirty"
+
+               # do we have anything to commit?
+               if git diff-index --cached --quiet HEAD --
+               then
+                       : Nothing to commit -- skip this
+               else
+                       . "$DOTEST"/author-script ||
+                               die "Cannot find the author identity"
+                       if test -f "$DOTEST"/amend
+                       then
+                               git reset --soft HEAD^ ||
+                               die "Cannot rewind the HEAD"
+                       fi
+                       export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
+                       git commit --no-verify -F "$DOTEST"/message -e ||
                        die "Could not commit staged changes."
+               fi
 
                require_clean_work_tree
                do_rest