Subject: Re: [PATCH v5 4/4] git-rebase: add keep_empty flag

From: Clemens Buchacher <[email-masked]>
Date: Sun, 15 Apr 2012 11:33:03 +0200

On Fri, Apr 13, 2012 at 02:45:07PM -0400, Neil Horman wrote:
>
> Add a command line switch to git-rebase to allow a user the ability to specify
> that they want to keep any commits in a series that are empty.

Thanks. That should be useful.

> +is_empty_commit() {
> +     ptree=$(git rev-parse "$1"^{tree})
> +     pptree=$(git rev-parse "$1"^^{tree})
> +     return $(test "$ptree" = "$pptree")
> +}
> +

What's the extra leading 'p' for? Any reason not to use 'tree' and
'ptree'?

>  pick_one () {
>  	ff=--ff
> +
> +	if is_empty_commit $@
> +	then
> +		empty_args="--allow-empty"
> +	fi
> +
>  	case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac

You do not handle the case where pick_one is called with -n. I think you
need to move the case statement in front and then call is_empty_commit
$sha1.

Not that it matters after this change, but in general using $@ without
quotes looks wrong to my eyes.

> @@ -780,9 +792,17 @@ git rev-list $merges_option --pretty=oneline --abbrev-commit \
>  	sed -n "s/^>//p" |
>  while read -r shortsha1 rest
>  do
> +
> +	if test -z "$keep_empty" && is_empty_commit $shortsha1
> +	then
> +		comment_out="# pick"
> +	else
> +		comment_out="pick"
> +	fi
> +
>  	if test t != "$preserve_merges"
>  	then
> -		printf '%s\n' "pick $shortsha1 $rest" >> "$todo"
> +		printf '%s\n' "$comment_out $shortsha1 $rest" >> "$todo"

How about setting comment_out="# " or comment_out="" instead and then

 printf '%s%s\n' "$comment_out" "pick $shortsha1 $rest" >> "$todo"

That would read more natural to me.