/
args.go
73 lines (67 loc) · 1.49 KB
/
args.go
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package require
import (
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
// NoArgs returns an error if any args are included.
func NoArgs(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
return errors.Errorf(
"%q accepts no arguments\n\nUsage: %s",
cmd.CommandPath(),
cmd.UseLine(),
)
}
return nil
}
// ExactArgs returns an error if there are not exactly n args.
func ExactArgs(n int) cobra.PositionalArgs {
return func(cmd *cobra.Command, args []string) error {
if len(args) != n {
return errors.Errorf(
"%q requires %d %s\n\nUsage: %s",
cmd.CommandPath(),
n,
pluralize("argument", n),
cmd.UseLine(),
)
}
return nil
}
}
// MaximumNArgs returns an error if there are more than N args.
func MaximumNArgs(n int) cobra.PositionalArgs {
return func(cmd *cobra.Command, args []string) error {
if len(args) > n {
return errors.Errorf(
"%q accepts at most %d %s\n\nUsage: %s",
cmd.CommandPath(),
n,
pluralize("argument", n),
cmd.UseLine(),
)
}
return nil
}
}
// MinimumNArgs returns an error if there is not at least N args.
func MinimumNArgs(n int) cobra.PositionalArgs {
return func(cmd *cobra.Command, args []string) error {
if len(args) < n {
return errors.Errorf(
"%q requires at least %d %s\n\nUsage: %s",
cmd.CommandPath(),
n,
pluralize("argument", n),
cmd.UseLine(),
)
}
return nil
}
}
func pluralize(word string, n int) string {
if n == 1 {
return word
}
return word + "s"
}