split screen completion into its own file

contrib/screen

@@ -0,0 +1,47 @@
+# -*- mode: shell-script; sh-basic-offset: 8; indent-tabs-mode: t -*-
+# ex: ts=8 sw=8 noet filetype=sh
+#
+# bash completion for screen
+
+# screen(1) completion
+#
+have screen &&
+_screen()
+{
+	local cur prev preprev
+
+	COMPREPLY=()
+	cur=`_get_cword`
+	prev=${COMP_WORDS[COMP_CWORD-1]}
+
+	[ "$COMP_CWORD" -ge 2 ] && preprev=${COMP_WORDS[COMP_CWORD-2]}
+
+	if [ "$preprev" = "-d" -o "$preprev" = "-D" -a "$prev" = "-r" -o \
+	     "$prev" = "-R" ]; then
+		# list all
+		COMPREPLY=( $( command screen -ls | \
+				sed -ne 's|^['$'\t'']\+\('$cur'[0-9]\+\.[^'$'\t'']\+\).*$|\1|p' ) )
+	else
+		case "$prev" in
+		-[rR])
+			# list detached
+			COMPREPLY=( $( command screen -ls | \
+					sed -ne 's|^['$'\t'']\+\('$cur'[0-9]\+\.[^'$'\t'']\+\).*Detached.*$|\1|p' ) )
+			;;
+		-[dDx])
+			# list attached
+			COMPREPLY=( $( command screen -ls | \
+					sed -ne 's|^['$'\t'']\+\('$cur'[0-9]\+\.[^'$'\t'']\+\).*Attached.*$|\1|p' ) )
+			;;
+		-s)
+			# shells
+			COMPREPLY=( $( grep ^${cur:-[^#]} /etc/shells ) )
+			;;
+		*)
+			;;
+		esac
+	fi
+
+	return 0
+} &&
+complete -F _screen $default screen