Re: [PATCH 3/4] git-commit: only append a newline to -m mesg if necessary

[Jonathan Nieder <jrnieder@gmail.com>]

Brandon Casey wrote:

> Currently, git will append two newlines to every message supplied via
> the -m switch.  The purpose of this is to allow -m to be supplied
> multiple times and have each supplied string become a paragraph in the
> resulting commit message.
>
> Normally, this does not cause a problem since any trailing newlines will
> be removed by the cleanup operation.  If cleanup=verbatim for example,
> then the trailing newlines will not be removed and will survive into the
> resulting commit message.
>
> Instead, let's ensure that the string supplied to -m is newline terminated,
> but only append a second newline when appending additional messages.
[...]
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -124,8 +124,10 @@ static int opt_parse_m(const struct option *opt, const char *arg, int unset)
>  	if (unset)
>  		strbuf_setlen(buf, 0);
>  	else {
> +		if (buf->len)
> +			strbuf_addch(buf, '\n');
>  		strbuf_addstr(buf, arg);
> -		strbuf_addstr(buf, "\n\n");
> +		strbuf_complete_line(buf);

As long as 'message' always consists of complete lines, this will
append 'arg' as a new paragraph, as desired.  And no other code path
touches 'message', so it always consists of complete lines.

Thanks for a clear patch and explanation.

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>

(rest of patch kept unsnipped for reference)

>  	}
>  	return 0;
>  }
> diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
> index 39e55f8..292bc08 100755
> --- a/t/t7502-commit.sh
> +++ b/t/t7502-commit.sh
> @@ -204,7 +204,7 @@ test_expect_success 'cleanup commit messages (verbatim option,-F)' '
>  
>  '
>  
> -test_expect_failure 'cleanup commit messages (verbatim option,-m)' '
> +test_expect_success 'cleanup commit messages (verbatim option,-m)' '
>  
>  	echo >>negative &&
>  	git commit --cleanup=verbatim -m "$mesg_with_comment_and_newlines" -a &&
> --