text: package cli
  
  import (
  	"flag"
  	"fmt"
  	"strconv"
  )
  
  // Int64Flag is a flag with type int64
  type Int64Flag struct {
  	Name        string
  	Usage       string
  	EnvVar      string
  	FilePath    string
  	Required    bool
  	Hidden      bool
  	Value       int64
  	Destination *int64
  }
  
  // String returns a readable representation of this value
  // (for usage defaults)
  func (f Int64Flag) String() string {
  	return FlagStringer(f)
  }
  
  // GetName returns the name of the flag
  func (f Int64Flag) GetName() string {
  	return f.Name
  }
  
  // IsRequired returns whether or not the flag is required
  func (f Int64Flag) IsRequired() bool {
  	return f.Required
  }
  
  // TakesValue returns true of the flag takes a value, otherwise false
  func (f Int64Flag) TakesValue() bool {
  	return true
  }
  
  // GetUsage returns the usage string for the flag
  func (f Int64Flag) GetUsage() string {
  	return f.Usage
  }
  
  // GetValue returns the flags value as string representation and an empty
  // string if the flag takes no value at all.
  func (f Int64Flag) GetValue() string {
  	return fmt.Sprintf("%d", f.Value)
  }
  
  // Apply populates the flag given the flag set and environment
  // Ignores errors
  func (f Int64Flag) Apply(set *flag.FlagSet) {
  	_ = f.ApplyWithError(set)
  }
  
  // ApplyWithError populates the flag given the flag set and environment
  func (f Int64Flag) ApplyWithError(set *flag.FlagSet) error {
  	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
  		envValInt, err := strconv.ParseInt(envVal, 0, 64)
  		if err != nil {
  			return fmt.Errorf("could not parse %s as int value for flag %s: %s", envVal, f.Name, err)
  		}
  
  		f.Value = envValInt
  	}
  
  	eachName(f.Name, func(name string) {
  		if f.Destination != nil {
  			set.Int64Var(f.Destination, name, f.Value, f.Usage)
  			return
  		}
  		set.Int64(name, f.Value, f.Usage)
  	})
  
  	return nil
  }
  
  // Int64 looks up the value of a local Int64Flag, returns
  // 0 if not found
  func (c *Context) Int64(name string) int64 {
  	return lookupInt64(name, c.flagSet)
  }
  
  // GlobalInt64 looks up the value of a global Int64Flag, returns
  // 0 if not found
  func (c *Context) GlobalInt64(name string) int64 {
  	if fs := lookupGlobalFlagSet(name, c); fs != nil {
  		return lookupInt64(name, fs)
  	}
  	return 0
  }
  
  func lookupInt64(name string, set *flag.FlagSet) int64 {
  	f := set.Lookup(name)
  	if f != nil {
  		parsed, err := strconv.ParseInt(f.Value.String(), 0, 64)
  		if err != nil {
  			return 0
  		}
  		return parsed
  	}
  	return 0
  }
  