github.com/olljanat/moby@v1.13.1/cli/required.go (about)

     1  package cli
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  
     7  	"github.com/spf13/cobra"
     8  )
     9  
    10  // NoArgs validates args and returns an error if there are any args
    11  func NoArgs(cmd *cobra.Command, args []string) error {
    12  	if len(args) == 0 {
    13  		return nil
    14  	}
    15  
    16  	if cmd.HasSubCommands() {
    17  		return fmt.Errorf("\n" + strings.TrimRight(cmd.UsageString(), "\n"))
    18  	}
    19  
    20  	return fmt.Errorf(
    21  		"\"%s\" accepts no argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
    22  		cmd.CommandPath(),
    23  		cmd.CommandPath(),
    24  		cmd.UseLine(),
    25  		cmd.Short,
    26  	)
    27  }
    28  
    29  // RequiresMinArgs returns an error if there is not at least min args
    30  func RequiresMinArgs(min int) cobra.PositionalArgs {
    31  	return func(cmd *cobra.Command, args []string) error {
    32  		if len(args) >= min {
    33  			return nil
    34  		}
    35  		return fmt.Errorf(
    36  			"\"%s\" requires at least %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
    37  			cmd.CommandPath(),
    38  			min,
    39  			cmd.CommandPath(),
    40  			cmd.UseLine(),
    41  			cmd.Short,
    42  		)
    43  	}
    44  }
    45  
    46  // RequiresMaxArgs returns an error if there is not at most max args
    47  func RequiresMaxArgs(max int) cobra.PositionalArgs {
    48  	return func(cmd *cobra.Command, args []string) error {
    49  		if len(args) <= max {
    50  			return nil
    51  		}
    52  		return fmt.Errorf(
    53  			"\"%s\" requires at most %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
    54  			cmd.CommandPath(),
    55  			max,
    56  			cmd.CommandPath(),
    57  			cmd.UseLine(),
    58  			cmd.Short,
    59  		)
    60  	}
    61  }
    62  
    63  // RequiresRangeArgs returns an error if there is not at least min args and at most max args
    64  func RequiresRangeArgs(min int, max int) cobra.PositionalArgs {
    65  	return func(cmd *cobra.Command, args []string) error {
    66  		if len(args) >= min && len(args) <= max {
    67  			return nil
    68  		}
    69  		return fmt.Errorf(
    70  			"\"%s\" requires at least %d and at most %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
    71  			cmd.CommandPath(),
    72  			min,
    73  			max,
    74  			cmd.CommandPath(),
    75  			cmd.UseLine(),
    76  			cmd.Short,
    77  		)
    78  	}
    79  }
    80  
    81  // ExactArgs returns an error if there is not the exact number of args
    82  func ExactArgs(number int) cobra.PositionalArgs {
    83  	return func(cmd *cobra.Command, args []string) error {
    84  		if len(args) == number {
    85  			return nil
    86  		}
    87  		return fmt.Errorf(
    88  			"\"%s\" requires exactly %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
    89  			cmd.CommandPath(),
    90  			number,
    91  			cmd.CommandPath(),
    92  			cmd.UseLine(),
    93  			cmd.Short,
    94  		)
    95  	}
    96  }