up-to-date bash can choose a new fd automatically!

1 files changed, 4 insertions, 7 deletions

diff --git a/twopane.bash b/twopane.bash
index 2a530db..0001f60 100755
--- a/twopane.bash
+++ b/twopane.bash
@@ -119,15 +119,12 @@ connect()
                         return 1
                         ;;
         esac
-        std0=${1:-200}
-        std1=${2:-201}
         if ! [ "${SOCAT[0]}" ]
         then
-                disconnect $std0 $std1
                 coproc SOCAT { socat_connect; }
         fi
         pid=${SOCAT_PID}
-        eval "exec ${std0}<&${SOCAT[0]} ${std1}>&${SOCAT[1]}"
+        eval "exec {std0}<&${SOCAT[0]} {std1}>&${SOCAT[1]}"
 }
 
 sendc()
@@ -144,7 +141,7 @@ send()
 
 disconnect()
 {
-        eval "exec ${1:-200}<&- ${2:-201}>&-"
+        [ "$1" -a "$2" ] && eval "exec $1<&- $2>&-"
         wait -f "$SOCAT_PID" 2>/dev/null
 }
 
@@ -215,7 +212,7 @@ focus()
 
 output_filter()
 {
-        exec 15> >(exec cat -v)
+        exec {OUTPUT_FILTER}> >(exec cat -v)
         while read -r -N1
         do
                 case "$REPLY" in
@@ -228,7 +225,7 @@ output_filter()
                 then
                         printf '%s' "$REPLY"
                 else
-                        printf '%s' "$REPLY" >&15
+                        printf '%s' "$REPLY" >&${OUTPUT_FILTER}
                 fi
         done
 }