Re: [PATCH 11/11] config-batch: add unset v1 command

>
> Signed-off-by: Derrick Stolee <stolee@gmail.com>
> ---
>  Documentation/git-config-batch.adoc | 28 ++++++++
>  builtin/config-batch.c              | 99 +++++++++++++++++++++++++++++
>  t/t1312-config-batch.sh             | 61 ++++++++++++++++--
>  3 files changed, 181 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/git-config-batch.adoc
> b/Documentation/git-config-batch.adoc
> index feec85c4ef..bdfd872d65 100644
> --- a/Documentation/git-config-batch.adoc
> +++ b/Documentation/git-config-batch.adoc
> @@ -135,6 +135,34 @@ set 1 success <scope> <key> <value>
>  set 1 failed <scope> <key> <value>
>  ------------
>
> +`unset` version 1::
> +	The `unset` command removes a single value from a config file.
> +	It specifies which file by a `<scope>` parameter from among
> +	`system`, `global`, `local`, and `worktree`. The `<key>` is the
> +	next positional argument. There could be two additional
> +	arguments used to match specific config values, where the first
> +	is either `arg:regex` or `arg:fixed-value` to specify the type
> +	of match.
> ++
> +------------
> +unset 1 <scope> <key>
> +unset 1 <scope> <key> arg:regex <value-pattern>
> +unset 1 <scope> <key> arg:fixed-value <value>
> +------------
> ++
> +These uses will match the behavior of `git config --unset --<scope> <key>`

> +with the additional arguments of `<value-pattern>` if `arg:regex` is
> +given or `--fixed-value <value>` if `arg:fixed-value` is given.
> ++
> +The response of these commands will include a `success` message
> +if matched values are found and removed as expected or `failed` if an
> +unexpected failure occurs:
> ++
> +------------
> +unset 1 success <scope> <key>
> +unset 1 failed <scope> <key>
> +------------
> +
>  NUL-Terminated Format
>  ~~~~~~~~~~~~~~~~~~~~~
>
> diff --git a/builtin/config-batch.c b/builtin/config-batch.c
> index 373b0cad47..25a942ba61 100644
> --- a/builtin/config-batch.c
> +++ b/builtin/config-batch.c
> @@ -17,6 +17,7 @@ static int zformat = 0;
>  #define HELP_COMMAND "help"
>  #define GET_COMMAND "get"
>  #define SET_COMMAND "set"
> +#define UNSET_COMMAND "unset"
>  #define COMMAND_PARSE_ERROR "command_parse_error"
>
>  static void print_word(const char *word, int start)
> @@ -445,6 +446,99 @@ cleanup:
>  	return res;
>  }
>
> +/**
> + * 'unset' command, version 1.
> + *
> + * Positional arguments should be of the form:
> + *
> + * [0] scope ("system", "global", "local", or "worktree")
> + * [1] config key
> + * [2] config value
> + * [3*] match ("regex", "fixed-value")
> + * [4*] value regex OR value string
> + *
> + * [N*] indicates optional parameters that are not needed.
> + */
> +static int unset_command_1(struct repository *repo,
> +			 const char *prefix,
> +			 char *data,
> +			 size_t data_len)
> +{
> +	int res = 0, err = 0, flags = 0;
> +	enum config_scope scope = CONFIG_SCOPE_UNKNOWN;
> +	char *token = NULL, *key = NULL, *value_pattern = NULL;
> +	size_t token_len;
> +	struct config_location_options locopts = CONFIG_LOCATION_OPTIONS_INIT;
> +
> +	if (!parse_token(&data, &data_len, &token, &err) || err)
> +		goto parse_error;
> +
> +	if (parse_scope(token, &scope) ||
> +	    scope == CONFIG_SCOPE_UNKNOWN ||
> +	    scope == CONFIG_SCOPE_SUBMODULE ||
> +	    scope == CONFIG_SCOPE_COMMAND)
> +		goto parse_error;