Re: [GSOC PATCH 1/2] environment: remove the global variable 'merge_log_config'

[Phillip Wood <phillip.wood123@gmail.com>]

Hi Ayush

On 29/07/2025 17:19, Ayush Chandekar wrote:
> 
> @@ -26,14 +26,7 @@ static struct string_list suppress_dest_patterns = STRING_LIST_INIT_DUP;
>   int fmt_merge_msg_config(const char *key, const char *value,
>   			 const struct config_context *ctx, void *cb)
>   {
> -	if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
> -		int is_bool;
> -		merge_log_config = git_config_bool_or_int(key, value, ctx->kvi, &is_bool);
> -		if (!is_bool && merge_log_config < 0)
> -			return error("%s: negative length %s", key, value);
> -		if (is_bool && merge_log_config)
> -			merge_log_config = DEFAULT_MERGE_LOG_LEN;
> -	} else if (!strcmp(key, "merge.branchdesc")) {

In the old code if both "merge.log" and "merge.summary" are set in the 
config file the last one wins

> +void adjust_shortlog_len(struct repository *r, int *shortlog_len)
> +{
> +	const char *keys[] = { "merge.log", "merge.summary", NULL};
> +	
> +	if (*shortlog_len >= 0)
> +		return;
> +
> +	for (const char **key = keys; *key; ++key) {
> +		int is_bool, value;
> +		if (!repo_config_get_bool_or_int(r, *key, &is_bool, &value)) {
> +			if (!is_bool && value < 0) {
> +				error("%s: negative length %d", *key, value);
> +				return;
> +			}
> +			*shortlog_len = (is_bool && value) ? DEFAULT_MERGE_LOG_LEN : value;
> +			return;

In the new code "merge.log" is always used in preference to 
"merge.summary" even if "merge.summary" appears later in the config 
file. When you have two keys setting the same variable I think the only 
way to preserve the last one wins behavior is to keep using a callback 
that updates the value as the config files are parsed.

Thanks

Phillip