99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
package cobra
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import (
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"fmt"
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)
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type PositionalArgs func(cmd *Command, args []string) error
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// Legacy arg validation has the following behaviour:
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// - root commands with no subcommands can take arbitrary arguments
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// - root commands with subcommands will do subcommand validity checking
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// - subcommands will always accept arbitrary arguments
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func legacyArgs(cmd *Command, args []string) error {
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// no subcommand, always take args
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if !cmd.HasSubCommands() {
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return nil
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}
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// root command with subcommands, do subcommand checking
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if !cmd.HasParent() && len(args) > 0 {
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return fmt.Errorf("unknown command %q for %q%s", args[0], cmd.CommandPath(), cmd.findSuggestions(args[0]))
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}
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return nil
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}
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// NoArgs returns an error if any args are included
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func NoArgs(cmd *Command, args []string) error {
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if len(args) > 0 {
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return fmt.Errorf("unknown command %q for %q", args[0], cmd.CommandPath())
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}
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return nil
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}
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// OnlyValidArgs returns an error if any args are not in the list of ValidArgs
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func OnlyValidArgs(cmd *Command, args []string) error {
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if len(cmd.ValidArgs) > 0 {
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for _, v := range args {
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if !stringInSlice(v, cmd.ValidArgs) {
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return fmt.Errorf("invalid argument %q for %q%s", v, cmd.CommandPath(), cmd.findSuggestions(args[0]))
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}
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}
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}
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return nil
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}
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func stringInSlice(a string, list []string) bool {
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for _, b := range list {
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if b == a {
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return true
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}
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}
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return false
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}
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// ArbitraryArgs never returns an error
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func ArbitraryArgs(cmd *Command, args []string) error {
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return nil
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}
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// MinimumNArgs returns an error if there is not at least N args
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func MinimumNArgs(n int) PositionalArgs {
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return func(cmd *Command, args []string) error {
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if len(args) < n {
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return fmt.Errorf("requires at least %d arg(s), only received %d", n, len(args))
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}
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return nil
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}
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}
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// MaximumNArgs returns an error if there are more than N args
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func MaximumNArgs(n int) PositionalArgs {
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return func(cmd *Command, args []string) error {
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if len(args) > n {
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return fmt.Errorf("accepts at most %d arg(s), received %d", n, len(args))
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}
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return nil
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}
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}
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// ExactArgs returns an error if there are not exactly n args
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func ExactArgs(n int) PositionalArgs {
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return func(cmd *Command, args []string) error {
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if len(args) != n {
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return fmt.Errorf("accepts %d arg(s), received %d", n, len(args))
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}
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return nil
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}
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}
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// RangeArgs returns an error if the number of args is not within the expected range
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func RangeArgs(min int, max int) PositionalArgs {
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return func(cmd *Command, args []string) error {
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if len(args) < min || len(args) > max {
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return fmt.Errorf("accepts between %d and %d arg(s), received %d", min, max, len(args))
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}
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return nil
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}
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}
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