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

*p = val

return &stringValue{

destination: p,

trimSpace: c.TrimSpace,

}

}

func (s stringValue) ToString(val string) string {

s.destination = &val

return s.String()

}

// 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 && *s.destination != "" {

return fmt.Sprintf("%q", *s.destination)

}

return ""

}

func (cmd *Command) String(name string) string {

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

tracef("string available for flag name %[1]q with value=%[2]v (cmd=%[3]q)", name, v, cmd.Name)

return v

}

tracef("string NOT available for flag name %[1]q (cmd=%[2]q)", name, cmd.Name)

return ""

}