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107 lines
2.1 KiB
107 lines
2.1 KiB
package kingpin
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import "fmt"
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type argGroup struct {
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args []*ArgClause
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}
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func newArgGroup() *argGroup {
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return &argGroup{}
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}
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func (a *argGroup) have() bool {
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return len(a.args) > 0
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}
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func (a *argGroup) Arg(name, help string) *ArgClause {
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arg := newArg(name, help)
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a.args = append(a.args, arg)
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return arg
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}
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func (a *argGroup) init() error {
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required := 0
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seen := map[string]struct{}{}
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previousArgMustBeLast := false
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for i, arg := range a.args {
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if previousArgMustBeLast {
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return fmt.Errorf("Args() can't be followed by another argument '%s'", arg.name)
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}
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if arg.consumesRemainder() {
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previousArgMustBeLast = true
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}
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if _, ok := seen[arg.name]; ok {
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return fmt.Errorf("duplicate argument '%s'", arg.name)
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}
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seen[arg.name] = struct{}{}
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if arg.required && required != i {
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return fmt.Errorf("required arguments found after non-required")
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}
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if arg.required {
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required++
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}
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if err := arg.init(); err != nil {
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return err
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}
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}
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return nil
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}
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type ArgClause struct {
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parserMixin
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name string
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help string
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defaultValue string
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required bool
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action Action
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preAction Action
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}
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func newArg(name, help string) *ArgClause {
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a := &ArgClause{
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name: name,
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help: help,
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}
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return a
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}
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func (a *ArgClause) consumesRemainder() bool {
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if r, ok := a.value.(remainderArg); ok {
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return r.IsCumulative()
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}
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return false
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}
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// Required arguments must be input by the user. They can not have a Default() value provided.
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func (a *ArgClause) Required() *ArgClause {
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a.required = true
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return a
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}
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// Default value for this argument. It *must* be parseable by the value of the argument.
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func (a *ArgClause) Default(value string) *ArgClause {
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a.defaultValue = value
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return a
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}
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func (a *ArgClause) Action(action Action) *ArgClause {
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a.action = action
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return a
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}
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func (a *ArgClause) PreAction(action Action) *ArgClause {
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a.preAction = action
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return a
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}
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func (a *ArgClause) init() error {
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if a.required && a.defaultValue != "" {
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return fmt.Errorf("required argument '%s' with unusable default value", a.name)
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}
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if a.value == nil {
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return fmt.Errorf("no parser defined for arg '%s'", a.name)
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}
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return nil
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}
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