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|
#! /bin/bash
# fai-sed, call sed with diff before writing
#
# (c) Thomas Lange 2019-2025 lange@debian.org
#
# idempotent sed. Execute sed command on a file
# but do not overwrite file if nothing has changed
dryrun=0
showchanged=0
while getopts nE opt ; do
case "$opt" in
E) showchanged=1 ;;
n) dryrun=1 ;;
esac
done
shift $((OPTIND - 1))
cmd=$1
shift
filename=$1
shift
if [ -z "$cmd" ] || [ -z "$filename" ]; then
printf "Please add filename and sed command\n"
exit 3
fi
# do not allow more than one file
if [ -n "$1" ]; then
printf "Aborting. Too many arguments.\n"
exit 5
fi
if [ -n "$target" ]; then
filename="$target$filename"
fi
if [ ! -f $filename ]; then
printf "WARNING: $filename does not exists. Skipping\n"
exit 0
fi
tmp=$(mktemp)
trap "rm $tmp" EXIT
printf "sed -e $cmd $filename: "
# cp file so we can use sed -i, otherwise the new file created by sed has different chmod, owner
cp -p $filename $tmp
sed -i -e "$cmd" $tmp
res=$?
if [ $res -ne 0 ]; then
printf "sed error $res\n"
exit $res
fi
cmp -s $filename $tmp
res=$?
if [ $res -eq 0 ]; then
printf " No changes.\n"
exit 0
fi
if [ $res -eq 1 ]; then
if [ $dryrun -eq 1 ]; then
printf " Dry-run. Changes not applied.\n"
exit 0
fi
mv $tmp $filename
printf " File changed.\n"
trap '' EXIT
if [ $showchanged -eq 1 ]; then
exit 9
fi
exit 0
fi
if [ $res -eq 2 ]; then
printf " diff error $res. No changes made to $filename\n"
exit 2
fi
|
