Add minimal/do, a stripped-down redo implementation in 977 bytes of sh.

This could be good for distributing with your packages, so that people who
don't have redo installed can at least build it.  Also, we could use it for
building redo itself.

Will surely need to get slightly bigger as I inevitably discover I've
forgotten a critical feature.

clean.do

@@ -1,3 +1,2 @@
 rm -f t/hello t/[by]ellow t/*.o *~ .*~ t/*~ t/.*~ *.pyc t/CC t/LD
 rm -rf .redo t/.redo
-

minimal/do

@@ -0,0 +1,54 @@
+#!/bin/sh
+#
+# A minimal alternative to djb redo that doesn't support incremental builds.
+# For the full version, visit http://github.com/apenwarr/redo
+#
+export REDO="$(dirname "$0")/$(basename "$0")"
+IFS="
+"
+
+if [ -z "$DO_BUILT" ]; then
+	export DO_BUILT="$PWD/.do_built"
+	if [ -e "$DO_BUILT" ]; then
+		echo "Removing previously built files..." >&2
+		sort "$DO_BUILT" | uniq | tee "$DO_BUILT.new" | xargs rm -f
+		mv "$DO_BUILT.new" "$DO_BUILT"
+	fi
+fi
+
+
+_do()
+{
+	TARGET="$1"
+	DOFILE="$1.do"
+	if [ ! -e "$TARGET" ]; then
+		printf '\033[32mdo  \033[1m%s\033[m\n' "$PWD/$TARGET" >&2
+		echo "$PWD/$TARGET" >>"$DO_BUILT"
+		set "$TARGET" FIXME "$TARGET.tmp"
+		( . "$PWD/$DOFILE" >"$TARGET.tmp" ) && 
+		mv "$TARGET.tmp" "$TARGET"
+	else
+		echo "$1 exists." >&2
+	fi
+}
+
+
+redo()
+{
+	for i in "$@"; do
+		D="$(dirname "$i")"
+		B="$(basename "$i")"
+		( cd "$D" && _do "$B" )
+	done
+}
+
+
+alias redo-ifchange="redo"
+alias redo-ifcreate=":"
+set -e
+
+if [ -n "$*" ]; then
+	redo "$@"
+else
+	redo all
+fi

redo.py

@@ -30,6 +30,7 @@ if not os.environ.get('REDO_BASE', ''):
             break
     os.environ['REDO_BASE'] = base
     os.environ['REDO_STARTDIR'] = os.getcwd()
+    os.environ['REDO'] = os.path.abspath(sys.argv[0])
 
     # FIXME: just wiping out all the locks is kind of cheating.  But we
     # only do this from the toplevel redo process, so unless the user

runtests.do

@@ -1,4 +1,4 @@
-. wvtest.sh
+. ./wvtest.sh
 
 redo t/all
 WVSTART "t/runtests"

t/bellow.do

@@ -1,3 +1,3 @@
 redo-ifchange LD yellow.o
-./LD bellow yellow.o
+./LD "$3" yellow.o
 ./sleep 2

t/hello.do

@@ -1,3 +1,3 @@
 redo-ifchange LD hello.o
 ./sleep 1
-./LD hello hello.o
+./LD "$3" hello.o

t/yellow.do

@@ -1,3 +1,3 @@
 redo-ifchange LD yellow.o
 ./sleep 1.5
-./LD yellow yellow.o
+./LD "$3" yellow.o

test.do

@@ -1,4 +1,2 @@
 redo-ifchange t/all
-wvtestrun redo runtests >&2
-
-
+./wvtestrun "$REDO" runtests >&2