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|
#!/bin/sh
# usage: ifchange target temporary
# Used in generating revision.h via Makefiles.
help() {
cat <<HELP
usage: $0 [options] target new-file
options:
--timestamp[=file] touch timestamp file. (default: prefixed with ".time".
under the directory of the target)
--keep[=suffix] keep old file with suffix. (default: '.old')
--empty assume unchanged if the new file is empty.
--color[=always|auto|never] colorize output.
HELP
}
set -e
timestamp=
keepsuffix=
empty=
color=auto
until [ $# -eq 0 ]; do
case "$1" in
--)
shift
break;
;;
--timestamp)
timestamp=.
;;
--timestamp=*)
timestamp=`expr \( "$1" : '[^=]*=\(.*\)' \)`
;;
--keep)
keepsuffix=.old
;;
--keep=*)
keepsuffix=`expr \( "$1" : '[^=]*=\(.*\)' \)`
;;
--empty)
empty=yes
;;
--color)
color=always
;;
--color=*)
color=`expr \( "$1" : '[^=]*=\(.*\)' \)`
;;
--debug)
set -x
;;
--help)
help
exit
;;
--*)
echo "$0: unknown option: $1" 1>&2
exit 1
;;
*)
break
;;
esac
shift
done
if [ "$#" != 2 ]; then
help
exit 1
fi
target="$1"
temp="$2"
if [ "$temp" = - ]; then
temp="tmpdata$$.tmp~"
cat > "$temp"
trap 'rm -f "$temp"' 0
fi
msg_begin= msg_unchanged= msg_updated= msg_reset=
if [ "$color" = always -o \( "$color" = auto -a -t 1 \) ]; then
msg_begin="["
case "`tput smso 2>/dev/null`" in
"$msg_begin"*m)
if [ ${TEST_COLORS:+set} ]; then
msg_unchanged=`expr ":$TEST_COLORS:" : ".*:pass=\([^:]*\):"` || :
msg_updated=`expr ":$TEST_COLORS:" : ".*:fail=\([^:]*\):"` || :
fi
msg_unchanged="${msg_begin}${msg_unchanged:-32}m"
msg_updated="${msg_begin}${msg_updated:-31;1}m"
msg_reset="${msg_begin}m"
;;
esac
unset msg_begin
fi
targetdir=
case "$target" in */*) targetdir=`dirname "$target"`;; esac
if [ -f "$target" -a ! -${empty:+f}${empty:-s} "$temp" ] || cmp "$target" "$temp" >/dev/null 2>&1; then
echo "$target ${msg_unchanged}unchanged${msg_reset}"
rm -f "$temp"
else
echo "$target ${msg_updated}updated${msg_reset}"
[ x"${targetdir}" = x -o -d "${targetdir}" ] || mkdir -p "${targetdir}"
[ x"${keepsuffix}" != x -a -f "$target" ] && mv -f "$target" "${target}${keepsuffix}"
mv -f "$temp" "$target"
fi
if [ -n "${timestamp}" ]; then
if [ x"${timestamp}" = x. ]; then
if [ x"$targetdir" = x ]; then
timestamp=.time."$target"
else
timestamp="$targetdir"/.time.`basename "$target"`
fi
fi
: > "$timestamp"
fi
|
