github.com/uhthomas/helm@v3.0.0-beta.3+incompatible/cmd/helm/require/args.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7  http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package require
    17  
    18  import (
    19  	"github.com/pkg/errors"
    20  	"github.com/spf13/cobra"
    21  )
    22  
    23  // NoArgs returns an error if any args are included.
    24  func NoArgs(cmd *cobra.Command, args []string) error {
    25  	if len(args) > 0 {
    26  		return errors.Errorf(
    27  			"%q accepts no arguments\n\nUsage:  %s",
    28  			cmd.CommandPath(),
    29  			cmd.UseLine(),
    30  		)
    31  	}
    32  	return nil
    33  }
    34  
    35  // ExactArgs returns an error if there are not exactly n args.
    36  func ExactArgs(n int) cobra.PositionalArgs {
    37  	return func(cmd *cobra.Command, args []string) error {
    38  		if len(args) != n {
    39  			return errors.Errorf(
    40  				"%q requires %d %s\n\nUsage:  %s",
    41  				cmd.CommandPath(),
    42  				n,
    43  				pluralize("argument", n),
    44  				cmd.UseLine(),
    45  			)
    46  		}
    47  		return nil
    48  	}
    49  }
    50  
    51  // MaximumNArgs returns an error if there are more than N args.
    52  func MaximumNArgs(n int) cobra.PositionalArgs {
    53  	return func(cmd *cobra.Command, args []string) error {
    54  		if len(args) > n {
    55  			return errors.Errorf(
    56  				"%q accepts at most %d %s\n\nUsage:  %s",
    57  				cmd.CommandPath(),
    58  				n,
    59  				pluralize("argument", n),
    60  				cmd.UseLine(),
    61  			)
    62  		}
    63  		return nil
    64  	}
    65  }
    66  
    67  // MinimumNArgs returns an error if there is not at least N args.
    68  func MinimumNArgs(n int) cobra.PositionalArgs {
    69  	return func(cmd *cobra.Command, args []string) error {
    70  		if len(args) < n {
    71  			return errors.Errorf(
    72  				"%q requires at least %d %s\n\nUsage:  %s",
    73  				cmd.CommandPath(),
    74  				n,
    75  				pluralize("argument", n),
    76  				cmd.UseLine(),
    77  			)
    78  		}
    79  		return nil
    80  	}
    81  }
    82  
    83  func pluralize(word string, n int) string {
    84  	if n == 1 {
    85  		return word
    86  	}
    87  	return word + "s"
    88  }