Re: [PATCH] commit: switch core.commentChar if it's found in existing commit

> If we need to use core.commentChar and it's already in the prepared
> message, find another char among a small subset. This should stop
> surprises because git strips some lines unexpectedly. Of course if
> candicate characters happen to be all out, this change does not help.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  On Fri, May 16, 2014 at 5:28 PM, Duy Nguyen <pclouds@gmail.com> wrote:
>  > But maybe git should detect that the
>  > current commit message has leading '#' and automatically switch to
>  > another character..
>
>  Something like this. Lightly tested.. I know there's a small bug..
>
>  builtin/commit.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> diff --git a/builtin/commit.c b/builtin/commit.c
> index 6ab4605..70ceb61 100644
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -593,6 +593,32 @@ static char *cut_ident_timestamp_part(char *string)
>  	return ket;
>  }
>  
> +static void adjust_comment_line_char(const struct strbuf *sb)
> +{
> +	char candidates[] = " !@#$%^&|:;~";

> +	char *candidate;
> +	const char *p;
> +	if (!sb->len)
> +		return;
> +	candidates[0] = comment_line_char;
> +	p = sb->buf;
> +	do {
> +		candidate = strchr(candidates, *p);
> +		if (candidate)
> +			*candidate = ' ';
> +		p = strchrnul(p, '\n');
> +		if (*p)
> +			p++;
> +	} while (*p);
> +	if (strchr(candidates, comment_line_char)) {
> +		p = candidates;
> +		while (*p && *p == ' ')
> +			p++;
> +		if (*p)
> +			comment_line_char = *p;
> +	}
> +}
> +
>  static int prepare_to_commit(const char *index_file, const char *prefix,
>  			     struct commit *current_head,
>  			     struct wt_status *s,
> @@ -748,6 +774,9 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
>  	if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
>  		die_errno(_("could not write commit template"));
>  
> +	if (use_editor && include_status)
> +		adjust_comment_line_char(&sb);
> +
>  	strbuf_release(&sb);
>  
>  	/* This checks if committer ident is explicitly given */