Documentation: Describe other situations where -z affects git diff

diff --git a/git-rebase.sh b/git-rebase.sh
index b121f4537ccb173d9f289734f1fe2e89b28d7562..fb4fef7b1d6f7abb08fca562ecaad6e36f671768 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -34,6 +34,8 @@ set_reflog_action rebase
 require_work_tree
 cd_to_toplevel
 
+LF='
+'
 OK_TO_SKIP_PRE_REBASE=
 RESOLVEMSG="
 When you have resolved this problem run \"git rebase --continue\".
@@ -50,6 +52,7 @@ diffstat=$(git config --bool rebase.stat)
 git_am_opt=
 rebase_root=
 force_rebase=
+allow_rerere_autoupdate=
 
 continue_merge () {
        test -n "$prev_head" || die "prev_head must be defined"
@@ -82,10 +85,8 @@ continue_merge () {
                        printf "Already applied: %0${prec}d " $msgnum
                fi
        fi
-       if test -z "$GIT_QUIET"
-       then
-               git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'
-       fi
+       test -z "$GIT_QUIET" &&
+       GIT_PAGER='' git log --format=%s -1 "$cmt"
 
        prev_head=`git rev-parse HEAD^0`
        # save the resulting commit so we can read-tree on it later
@@ -118,7 +119,7 @@ call_merge () {
                return
                ;;
        1)
-               git rerere
+               git rerere $allow_rerere_autoupdate
                die "$RESOLVEMSG"
                ;;
        2)
@@ -349,6 +350,9 @@ do
        -f|--f|--fo|--for|--forc|force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase)
                force_rebase=t
                ;;
+       --rerere-autoupdate|--no-rerere-autoupdate)
+               allow_rerere_autoupdate="$1"
+               ;;
        -*)
                usage
                ;;
@@ -417,7 +421,27 @@ fi
 
 # Make sure the branch to rebase onto is valid.
 onto_name=${newbase-"$upstream_name"}
-onto=$(git rev-parse --verify "${onto_name}^0") || exit
+case "$onto_name" in
+*...*)
+       if      left=${onto_name%...*} right=${onto_name#*...} &&
+               onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
+       then
+               case "$onto" in
+               ?*"$LF"?*)
+                       die "$onto_name: there are more than one merge bases"
+                       ;;
+               '')
+                       die "$onto_name: there is no merge base"
+                       ;;
+               esac
+       else
+               die "$onto_name: there is no merge base"
+       fi
+       ;;
+*)
+       onto=$(git rev-parse --verify "${onto_name}^0") || exit
+       ;;
+esac
 
 # If a hook exists, give it a chance to interrupt
 run_pre_rebase_hook "$upstream_arg" "$@"