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