Re: [PATCH v2] rebase -i: avoid 'git reset' when possible

> +# skip picking commits whose parents are unchanged
> +skip_unnecessary_picks () {
> +	fd=3
> +	while read command sha1 rest
> +	do
> +		# fd=3 means we skip the command
> +		case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
> +		3,pick,"$ONTO"*|t,p,"$ONTO"*)

> +			# pick a commit whose parent is current $ONTO -> skip
> +			ONTO=$sha1
> +			;;
> +		3,#*|3,,*)
> +			# copy comments
> +			;;
> +		*)
> +			fd=1
> +			;;
> +		esac
> +		echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
> +	done < "$TODO" > "$TODO.new" 3>> "$DONE" &&
> +	mv -f "$TODO".new "$TODO" ||
> +	die "Could not skip unnecessary pick commands"
> +}