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package cli
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import (
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"flag"
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"fmt"
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"strconv"
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)
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// UintFlag is a flag with type uint
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type UintFlag struct {
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Name string
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Aliases []string
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Usage string
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EnvVars []string
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FilePath string
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Required bool
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Hidden bool
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Value uint
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DefaultText string
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Destination *uint
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HasBeenSet bool
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}
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// IsSet returns whether or not the flag has been set through env or file
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func (f *UintFlag) IsSet() bool {
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return f.HasBeenSet
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}
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// String returns a readable representation of this value
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// (for usage defaults)
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func (f *UintFlag) String() string {
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return FlagStringer(f)
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}
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// Names returns the names of the flag
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func (f *UintFlag) Names() []string {
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return flagNames(f.Name, f.Aliases)
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}
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// IsRequired returns whether or not the flag is required
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func (f *UintFlag) IsRequired() bool {
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return f.Required
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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 *UintFlag) 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 *UintFlag) GetUsage() string {
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return f.Usage
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}
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// IsVisible returns true if the flag is not hidden, otherwise false
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func (f *UintFlag) IsVisible() bool {
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return !f.Hidden
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}
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// Apply populates the flag given the flag set and environment
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func (f *UintFlag) Apply(set *flag.FlagSet) error {
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if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
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if val != "" {
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valInt, err := strconv.ParseUint(val, 0, 64)
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if err != nil {
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return fmt.Errorf("could not parse %q as uint value for flag %s: %s", val, f.Name, err)
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}
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f.Value = uint(valInt)
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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.UintVar(f.Destination, name, f.Value, f.Usage)
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continue
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}
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set.Uint(name, f.Value, f.Usage)
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}
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return nil
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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 *UintFlag) GetValue() string {
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return fmt.Sprintf("%d", f.Value)
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}
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// GetDefaultText returns the default text for this flag
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func (f *UintFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return f.GetValue()
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}
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// GetEnvVars returns the env vars for this flag
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func (f *UintFlag) GetEnvVars() []string {
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return f.EnvVars
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}
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// ValueFromContext returns the flag’s value in the given Context.
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func (f *UintFlag) ValueFromContext(ctx *Context) uint {
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return ctx.Uint(f.Name)
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}
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// Uint looks up the value of a local UintFlag, returns
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// 0 if not found
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func (c *Context) Uint(name string) uint {
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if fs := c.lookupFlagSet(name); fs != nil {
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return lookupUint(name, fs)
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}
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return 0
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}
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func lookupUint(name string, set *flag.FlagSet) uint {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
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if err != nil {
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return 0
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}
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return uint(parsed)
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}
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return 0
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}
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