help: check early if we have a command, if not try a documentation topic

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 8ee08ff2fd4e414337f79a7e52d29ccda72377e6..a64d9d57ab5943ac4e065866ce0ccd7de5364a9a 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -475,6 +475,9 @@ do
 
                require_clean_work_tree
 
+               UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
+               test -z "$ONTO" && ONTO=$UPSTREAM
+
                if test ! -z "$2"
                then
                        output git show-ref --verify --quiet "refs/heads/$2" ||
@@ -484,12 +487,8 @@ do
                fi
 
                HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
-               UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
-
                mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 
-               test -z "$ONTO" && ONTO=$UPSTREAM
-
                : > "$DOTEST"/interactive || die "Could not mark as interactive"
                git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
                        echo "detached HEAD" > "$DOTEST"/head-name
@@ -531,9 +530,9 @@ do
 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 #
 # Commands:
-#  pick = use commit
-#  edit = use commit, but stop for amending
-#  squash = use commit, but meld into previous commit
+#  p, pick = use commit
+#  e, edit = use commit, but stop for amending
+#  s, squash = use commit, but meld into previous commit
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.