Re: [PATCH v3 06/38] sequencer (rebase -i): implement the 'edit' command

> +static int make_patch(struct commit *commit, struct replay_opts *opts)
> +{
> +	struct strbuf buf = STRBUF_INIT;
> +	struct rev_info log_tree_opt;
> +	const char *subject, *p;
> +	int res = 0;
> +
> +	p = short_commit_name(commit);
> +	if (write_message(p, strlen(p), rebase_path_stopped_sha(), 1) < 0)
> +		return -1;
> +
> +	strbuf_addf(&buf, "%s/patch", get_dir(opts));
> +	memset(&log_tree_opt, 0, sizeof(log_tree_opt));
> +	init_revisions(&log_tree_opt, NULL);
> +	log_tree_opt.abbrev = 0;
> +	log_tree_opt.diff = 1;
> +	log_tree_opt.diffopt.output_format = DIFF_FORMAT_PATCH;
> +	log_tree_opt.disable_stdin = 1;
> +	log_tree_opt.no_commit_id = 1;
> +	log_tree_opt.diffopt.file = fopen(buf.buf, "w");
> +	log_tree_opt.diffopt.use_color = GIT_COLOR_NEVER;
> +	if (!log_tree_opt.diffopt.file)
> +		res |= error_errno(_("could not open '%s'"), buf.buf);
> +	else {
> +		res |= log_tree_commit(&log_tree_opt, commit);
> +		fclose(log_tree_opt.diffopt.file);
> +	}
> +	strbuf_reset(&buf);
> +
> +	strbuf_addf(&buf, "%s/message", get_dir(opts));
> +	if (!file_exists(buf.buf)) {
> +		const char *commit_buffer = get_commit_buffer(commit, NULL);
> +		find_commit_subject(commit_buffer, &subject);
> +		res |= write_message(subject, strlen(subject), buf.buf, 1);
> +		unuse_commit_buffer(commit, commit_buffer);
> +	}
> +	strbuf_release(&buf);
> +
> +	return res;
> +}