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# $Id: install-new.mk,v 1.3 2012/03/24 18:25:49 sjg Exp $
#
# @(#) Copyright (c) 2009, Simon J. Gerraty
#
# This file is provided in the hope that it will
# be of use. There is absolutely NO WARRANTY.
# Permission to copy, redistribute or otherwise
# use this file is hereby granted provided that
# the above copyright notice and this notice are
# left intact.
#
# Please send copies of changes and bug-fixes to:
# sjg@crufty.net
#
.if !defined(InstallNew)
# copy if src and target are different making a backup if desired
CmpCp= CmpCp() { \
src=$$1 target=$$2 _bak=$$3; \
if ! test -s $$target || ! cmp -s $$target $$src; then \
trap "" 1 2 3 15; \
if test -s $$target; then \
if test "x$$_bak" != x; then \
rm -f $$target$$_bak; \
mv $$target $$target$$_bak; \
else \
rm -f $$target; \
fi; \
fi; \
cp $$src $$target; \
fi; }
# If the .new file is different, we want it.
# Note: this function will work as is for *.new$RANDOM"
InstallNew= ${CmpCp}; InstallNew() { \
_t=-e; _bak=; \
while :; do \
case "$$1" in \
-?) _t=$$1; shift;; \
--bak) _bak=$$2; shift 2;; \
*) break;; \
esac; \
done; \
for new in "$$@"; do \
if test $$_t $$new; then \
target=`expr $$new : '\(.*\).new'`; \
CmpCp $$new $$target $$_bak; \
fi; \
rm -f $$new; \
done; :; }
.endif
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