rebase -i: teach --onto A...B syntax

diff --git a/git-rebase.sh b/git-rebase.sh
index 18bc6946cfa592c11cf7499b1c1ff9a6cb378b26..9bd89746ab6ab6999aeead41a59ca0f4c9b3a61a 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\".
@@ -333,6 +335,9 @@ do
                        ;;
                esac
                ;;
+       --ignore-whitespace)
+               git_am_opt="$git_am_opt $1"
+               ;;
        --committer-date-is-author-date|--ignore-date)
                git_am_opt="$git_am_opt $1"
                force_rebase=t
@@ -382,8 +387,10 @@ else
 fi
 
 # The tree must be really really clean.
-if ! git update-index --ignore-submodules --refresh; then
-       die "cannot rebase: you have unstaged changes"
+if ! git update-index --ignore-submodules --refresh > /dev/null; then
+       echo >&2 "cannot rebase: you have unstaged changes"
+       git diff-files --name-status -r --ignore-submodules -- >&2
+       exit 1
 fi
 diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 case "$diff" in
@@ -412,7 +419,27 @@ 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 "$upstream_arg" "$@"