Re: [PATCH] clean: improve -n and -f implementation and documentation

> What -n actually does in addition to its documented behavior is
> ignoring of configuration variable clean.requireForce, that makes
> sense provided -n prevents files removal anyway.
> 
> So, first, document this in the manual, and then modify implementation
> to make this more explicit in the code.
> 
> Improved implementation also stops to share single internal variable
> 'force' between command-line -f option and configuration variable
> clean.requireForce, resulting in more clear logic.
> 
> The error messages now do not mention -n as well, as it seems
> unnecessary and does not reflect clarified implementation.
> 
> Signed-off-by: Sergey Organov <sorganov@gmail.com>
> ---
>  Documentation/git-clean.txt |  2 ++
>  builtin/clean.c             | 26 +++++++++++++-------------
>  2 files changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/Documentation/git-clean.txt b/Documentation/git-clean.txt
> index 69331e3f05a1..662eebb85207 100644
> --- a/Documentation/git-clean.txt
> +++ b/Documentation/git-clean.txt
> @@ -49,6 +49,8 @@ OPTIONS
>  -n::
>  --dry-run::
>  	Don't actually remove anything, just show what would be done.
> +	Configuration variable clean.requireForce is ignored, as
> +	nothing will be deleted anyway.

>  
>  -q::
>  --quiet::
> diff --git a/builtin/clean.c b/builtin/clean.c
> index d90766cad3a0..fcc50d08ee9b 100644
> --- a/builtin/clean.c
> +++ b/builtin/clean.c
> @@ -25,7 +25,7 @@
>  #include "help.h"
>  #include "prompt.h"
>  
> -static int force = -1; /* unset */
> +static int require_force = -1; /* unset */
>  static int interactive;
>  static struct string_list del_list = STRING_LIST_INIT_DUP;
>  static unsigned int colopts;
> @@ -128,7 +128,7 @@ static int git_clean_config(const char *var, const char *value,
>  	}
>  
>  	if (!strcmp(var, "clean.requireforce")) {
> -		force = !git_config_bool(var, value);
> +		require_force = git_config_bool(var, value);
>  		return 0;
>  	}
>  
> @@ -920,7 +920,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
>  {
>  	int i, res;
>  	int dry_run = 0, remove_directories = 0, quiet = 0, ignored = 0;
> -	int ignored_only = 0, config_set = 0, errors = 0, gone = 1;
> +	int ignored_only = 0, force = 0, errors = 0, gone = 1;
>  	int rm_flags = REMOVE_DIR_KEEP_NESTED_GIT;
>  	struct strbuf abs_path = STRBUF_INIT;
>  	struct dir_struct dir = DIR_INIT;
> @@ -946,21 +946,21 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
>  	};
>  
>  	git_config(git_clean_config, NULL);
> -	if (force < 0)
> -		force = 0;
> -	else
> -		config_set = 1;
>  
>  	argc = parse_options(argc, argv, prefix, options, builtin_clean_usage,
>  			     0);
>  
> -	if (!interactive && !dry_run && !force) {
> -		if (config_set)
> -			die(_("clean.requireForce set to true and neither -i, -n, nor -f given; "
> +	/* Dry run won't remove anything, so requiring force makes no sense */
> +	if(dry_run)
> +		require_force = 0;
> +
> +	if (!force && !interactive) {
> +		if (require_force > 0)
> +			die(_("clean.requireForce set to true and neither -f, nor -i given; "
> +				  "refusing to clean"));
> +		else if (require_force < 0)
> +			die(_("clean.requireForce defaults to true and neither -f, nor -i given; "
>  				  "refusing to clean"));
> -		else
> -			die(_("clean.requireForce defaults to true and neither -i, -n, nor -f given;"
> -				  " refusing to clean"));
>  	}
>