Change definitions of $1,$2,$3 to match djb's redo.

If you use "redo --old-args", it will switch back to the old
(apenwarr-style) arguments for now, to give you time to update your .do
scripts.  This option will go away eventually.

Note: minimal/do doesn't understand the --old-args option.  If you're using
minimal/do in your project, keep using the old one until you update your use
of $1/$2, and then update to the new one.

apenwarr-style default.o.do:
   $1      foo
   $2      .o
   $3      whatever.tmp

djb-style default.o.do:
   $1      foo.o
   $2      foo
   $3      whatever.tmp

apenwarr-style foo.o.do:
   $1      foo.o
   $2      ""
   $3      whatever.tmp

djb-style foo.o.do:
   $1      foo.o
   $2      foo.o  (I think?)
   $3      whatever.tmp

t/curse/default.n1.do

@@ -1,3 +1,3 @@
 DEPS=$(./seq 100 | sed 's/$/.n2/')
 redo-ifchange $DEPS
-echo n1-$1
+echo n1-$2

t/curse/default.n2.do

@@ -1,6 +1,6 @@
-echo n2-$1
-echo $1 >>$1.count
-echo $1 >>in.countall
+echo n2-$2
+echo $2 >>$2.count
+echo $2 >>in.countall
 
 # we deliberately use 'redo' here instead of redo-ifchange, because this *heavily*
 # stresses redo's locking when building in parallel.  We end up with 100

t/default.args.do

@@ -1,3 +1,3 @@
-[ "$1" = "test" ]
-[ "$2" = ".args" ]
+[ "$1" = "test.args" ]
+[ "$2" = "test" ]
 [ "$3" != "test.args" ]

t/defaults-flat/c.do

@@ -1,3 +1,3 @@
-redo-ifchange $1$2.c
+redo-ifchange $1.c
 echo c.do
-cat $1$2.c
+cat $1.c

t/defaults-flat/default.b.do

@@ -1,10 +1,10 @@
-if [ -e "$1$2.a" -o -e "default$2.a" ]; then
-	redo-ifchange "$1$2.a"
+if [ -e "$1.a" -o -e "default${1#$2}.a" ]; then
+	redo-ifchange "$1.a"
 	echo a-to-b
-	cat "$1$2.a"
+	cat "$1.a"
 else
-	redo-ifchange "$1$2.b"
+	redo-ifchange "$1.b"
 	echo b-to-b
-	cat "$1$2.b"
+	cat "$1.b"
 fi
 ../sleep 1.1

t/defaults-flat/default.c.c.do

@@ -1,4 +1,4 @@
-redo-ifchange $1$2.b
+redo-ifchange $1.b
 echo b-to-cc
-cat $1$2.b
+cat $1.b
 ../sleep 1.2

t/defaults-flat/default.c.do

@@ -1,4 +1,4 @@
-redo-ifchange $1$2.c
+redo-ifchange $1.c
 echo c-to-c
-cat $1$2.c
+cat $1.c
 ../sleep 1.3

t/defaults-nested/a/b/default.y.z.do

@@ -1 +1 @@
-echo default.y.z $1 $2
+echo default.y.z $2 ${1#$2}

t/defaults-nested/a/b/file.x.y.z.do

@@ -1 +1 @@
-echo file $1 $2
+echo file $2 ${1#$2}

t/defaults-nested/a/d/default.do

@@ -1 +1 @@
-echo default $1 $2
+echo default $2 ${1#$2}

t/defaults-nested/a/default.x.y.z.do

@@ -1,2 +1,2 @@
-echo default.x.y.z $1 $2
+echo default.x.y.z $2 ${1#$2}
 

t/defaults-nested/a/default.z.do

@@ -1 +1 @@
-echo default.z $1 $2
+echo default.z $2 ${1#$2}

t/defaults-nested/default.do

@@ -1 +1 @@
-echo root $1 $2 "$(dirname $3)"
+echo root $2 ${1#$2} "$(dirname $3)"

t/deps/basic/default.out.do

@@ -1,3 +1,3 @@
-redo-ifchange $1.in
+redo-ifchange $2.in
 echo $$
-echo $$ >>$1.log
+echo $$ >>$2.log

t/example/CC.do

@@ -2,8 +2,8 @@ redo-ifchange config.sh
 . ./config.sh
 exec >$3
 cat <<-EOF
-	redo-ifchange \$1.c
-	gcc $CFLAGS -MD -MF \$3.deps -o \$3 -c \$1.c
+	redo-ifchange \$2.c
+	gcc $CFLAGS -MD -MF \$3.deps -o \$3 -c \$2.c
 	read DEPS <\$3.deps
 	rm -f \$3.deps
 	redo-ifchange \${DEPS#*:}

t/test2.args.do

@@ -1,3 +1,3 @@
 [ "$1" = "test2.args" ]
-[ "$2" = "" ]
+[ "$2" = "test2.args" ]
 [ "$3" != "test2.args" ]