forward() will restart top process if necessary

it issues a warning if so

1 files changed, 13 insertions, 4 deletions

diff --git a/twopane.bash b/twopane.bash
index ed9b83c..45b9739 100755
--- a/twopane.bash
+++ b/twopane.bash
@@ -57,9 +57,14 @@ screen -ln -t "$BOT_TITLE" 0 bash --noprofile --rcfile "$TWOPANE"/bashrc -i
 layout save 0
 .
 
+check_top()
+{
+        screen -p1 -Q info >/dev/null
+}
+
 kill_top()
 {
-        while screen -p1 -Q info >/dev/null
+        while check_top
         do
                 screen -p1 -X kill
         done
@@ -67,7 +72,7 @@ kill_top()
 
 start_top()
 {
-        if screen -p1 -Q info >/dev/null
+        if check_top
         then
                 return
         fi
@@ -197,8 +202,11 @@ forward()
 
 forward_input()
 {
-        old_stty=$(stty -g)
-        exec 100<&0 101>&1
+        if ! check_top
+        then
+                echo "$0: Warning: Nothing to forward.  Starting anew." >&2
+                background "$@"
+        fi
         focus top
         socat FD:100,cfmakeraw!!STDOUT - <&$stdin |
         tee >(output_filter | soft_cursor >&101) >&$stdout
@@ -279,6 +287,7 @@ our_bashrc_main()
 }
 
 save_file bashrc <<.
+BASH_ARGV0=twopane
 ${TOP_CMD@A}
 ${BOT_CMD@A}
 ${TOP_TITLE@A}