mirror of
https://github.com/vbatts/go-mtree.git
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124 lines
2.7 KiB
Go
124 lines
2.7 KiB
Go
package cli
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import (
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"flag"
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"fmt"
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)
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// Generic is a generic parseable type identified by a specific flag
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type Generic interface {
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Set(value string) error
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String() string
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}
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type stringGeneric struct {
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value string
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}
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func (s *stringGeneric) Set(value string) error {
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s.value = value
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return nil
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}
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func (s *stringGeneric) String() string {
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return s.value
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}
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// TakesValue returns true of the flag takes a value, otherwise false
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func (f *GenericFlag) TakesValue() bool {
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return true
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}
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// GetUsage returns the usage string for the flag
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func (f *GenericFlag) GetUsage() string {
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return f.Usage
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}
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// GetCategory returns the category for the flag
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func (f *GenericFlag) GetCategory() string {
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return f.Category
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}
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// GetValue returns the flags value as string representation and an empty
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// string if the flag takes no value at all.
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func (f *GenericFlag) GetValue() string {
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if f.Value != nil {
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return f.Value.String()
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}
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return ""
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}
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// GetDefaultText returns the default text for this flag
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func (f *GenericFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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if f.defaultValue != nil {
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return f.defaultValue.String()
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}
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return ""
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}
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// GetEnvVars returns the env vars for this flag
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func (f *GenericFlag) GetEnvVars() []string {
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return f.EnvVars
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}
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// Apply takes the flagset and calls Set on the generic flag with the value
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// provided by the user for parsing by the flag
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func (f *GenericFlag) Apply(set *flag.FlagSet) error {
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// set default value so that environment wont be able to overwrite it
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if f.Value != nil {
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f.defaultValue = &stringGeneric{value: f.Value.String()}
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}
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if val, source, found := flagFromEnvOrFile(f.EnvVars, f.FilePath); found {
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if val != "" {
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if err := f.Value.Set(val); err != nil {
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return fmt.Errorf("could not parse %q from %s as value for flag %s: %s", val, source, f.Name, err)
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}
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f.HasBeenSet = true
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}
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}
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for _, name := range f.Names() {
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if f.Destination != nil {
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set.Var(f.Destination, name, f.Usage)
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continue
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}
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set.Var(f.Value, name, f.Usage)
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}
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return nil
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}
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// Get returns the flag’s value in the given Context.
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func (f *GenericFlag) Get(ctx *Context) interface{} {
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return ctx.Generic(f.Name)
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}
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// RunAction executes flag action if set
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func (f *GenericFlag) RunAction(c *Context) error {
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if f.Action != nil {
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return f.Action(c, c.Generic(f.Name))
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}
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return nil
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}
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// Generic looks up the value of a local GenericFlag, returns
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// nil if not found
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func (cCtx *Context) Generic(name string) interface{} {
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if fs := cCtx.lookupFlagSet(name); fs != nil {
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return lookupGeneric(name, fs)
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}
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return nil
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}
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func lookupGeneric(name string, set *flag.FlagSet) interface{} {
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if f := set.Lookup(name); f != nil {
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return f.Value
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}
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return nil
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}
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