Make miscutils/rr a ksh function

Making this a function available through FPATH allows me to use `rr`
with aliases and funcions defined only for interactive shells.

Makefile

@@ -1,6 +1,6 @@
 BINDIR?=${HOME}/.local/bin
 cmds=g kpick
-fns=diralias j jmod nsalias
+fns=diralias j jmod nsalias rr
 install:
 	install ${fns} $${FPATH:?FPATH not defined}
 	install ${cmds} ${BINDIR}

rr

@@ -0,0 +1,19 @@
+function rr
+{
+	(( $# == 0 )) && print "usage: $0 command ..." && return 64
+	typeset tmp1=$(mktemp $0.XXXXXXXXXX)
+	typeset tmp2=$(mktemp $0.XXXXXXXXXX)
+	trap "rm $tmp1 $tmp2; exit 0" 0 1 2 15
+	while eval "$@" >$tmp2
+	do
+		if ! diff $tmp1 $tmp2
+		then
+			cp $tmp2 $tmp1
+		else
+			print -n "."
+		fi
+		sleep 2
+	done
+	print
+	rm $tmp1 $tmp2
+}