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flag_string.go

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package cli

import (

"fmt"

"strings"

)

type StringFlag = FlagBase[string, StringConfig, stringValue]

// StringConfig defines the configuration for string flags

type StringConfig struct {

// Whether to trim whitespace of parsed value

TrimSpace bool

}

// -- string Value

type stringValue struct {

destination *string

trimSpace bool

}

// Below functions are to satisfy the ValueCreator interface

func (i stringValue) Create(val string, p *string, c StringConfig) Value {

*p = val

return &stringValue{

destination: p,

trimSpace: c.TrimSpace,

}

}

func (i stringValue) ToString(b string) string {

if b == "" {

return b

}

return fmt.Sprintf("%q", b)

}

// Below functions are to satisfy the flag.Value interface

func (s *stringValue) Set(val string) error {

if s.trimSpace {

val = strings.TrimSpace(val)

}

*s.destination = val

return nil

}

func (s *stringValue) Get() any { return *s.destination }

func (s *stringValue) String() string {

if s.destination != nil {

return *s.destination

}

return ""

}

func (cCtx *Context) String(name string) string {

if v, ok := cCtx.Value(name).(string); ok {

return v

}

return ""

}