Make location of redoconf scripts definable

redoconf/configure.sh

@@ -12,25 +12,25 @@ if [ -e "configure" ] || [ -e "rc.sh" ]; then
 	exit 99
 fi
 
-S="$(dirname "$0")"
+: ${REDOCONF:="$S/redoconf"}
 rm -f src Makefile
-echo "$S" >src
+printf "%s\n%s\n" "$S" "$REDOCONF" >src
 
 # Don't regenerate these files unless they're missing.  Otherwise redo
 # will treat it as a changed dependency and rebuild a bunch of files
 # unnecessarily.
 [ -e redoconf.rc ] || cat >redoconf.rc <<-EOF
 	# Automatically generated by $0
-	read -r S <src
-	. "\$S/redoconf/rc.sh"
+	{ read -r S ; read -r REDOCONF ; } <src
+	. "\$REDOCONF/rc.sh"
 EOF
 
 # Instead of a symlink, we could make this a script like redoconf.rc,
 # except then we would have to redi-ifchange default.do.sh, which would
 # greatly increase the number of calls to redo-ifchange in the fast path.
 # That turns out to slow things down quite a bit.  So let redo follow
 # the symlink and note the dependency internally, which is faster.
-[ -e default.do ] || ln -sf "$S/redoconf/default.do.sh" default.do
+[ -e default.do ] || ln -sf "$REDOCONF/default.do.sh" default.do
 
 cat >Makefile <<'EOF'
 # A wrapper for people who like to type 'make' instead of 'redo'
@@ -41,7 +41,7 @@ EOF
 
 # Don't include rc.sh here, because that might call redo-ifchange,
 # and we're not ready for that yet.
-. "$S/redoconf/utils.sh"
+. "$REDOCONF/utils.sh"
 
 usage() {
 	exec >&2

redoconf/default.do.sh

@@ -1,6 +1,5 @@
 # This script starts with $PWD=output dir, $S=input dir.
-read -r S <src
-REDOCONF="$S/redoconf"
+{ read -r S ; read -r REDOCONF ; } <src
 if [ ! -d "$S" ] || [ ! -f "$REDOCONF/default.do.sh" ]; then
 	echo "default.do.sh: \$S is not set correctly." >&2
 	exit 99

redoconf/rc.sh

@@ -1,5 +1,4 @@
 # This script starts with $PWD=output dir, $S=input dir.
-REDOCONF="$S/redoconf"
 if [ ! -d "$S" ] || [ ! -f "$REDOCONF/default.do.sh" ]; then
 	echo "default.do.sh: \$S is not set correctly." >&2
 	exit 99