- echo "$str" | sort_patterns - $file | cmp -s - $file > /dev/null \
- || { echo "$str" | sort_patterns - $file > $file.bak \
- && mv $file.bak $file; } \
- || die "insert_sorted_if_absent $file $str: failed"
+ test -r $file || die "Error: failed to read ignore file: $file"
+ duplicate_entries=$(gitignore_entries $file | sort | uniq -d)
+ if [ "$duplicate_entries" ] ; then
+ die "Error: Duplicate entries in $file: " $duplicate_entries
+ fi
+ linesold=$(gitignore_entries $file | wc -l)
+ linesnew=$(echo "$str" | gitignore_entries - $file | sort -u | wc -l)
+ if [ $linesold != $linesnew ] ; then
+ { echo "$str" | cat - $file > $file.bak && mv $file.bak $file; } \
+ || die "insert_if_absent $file $str: failed"
+ fi