mirror of https://github.com/vbatts/tar-split.git
107 lines
2.3 KiB
Go
107 lines
2.3 KiB
Go
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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Usage string
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EnvVar 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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Destination *uint
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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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// GetName returns the name of the flag
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func (f UintFlag) GetName() string {
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return f.Name
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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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// Apply populates the flag given the flag set and environment
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// Ignores errors
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func (f UintFlag) Apply(set *flag.FlagSet) {
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_ = f.ApplyWithError(set)
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}
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// ApplyWithError populates the flag given the flag set and environment
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func (f UintFlag) ApplyWithError(set *flag.FlagSet) error {
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if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
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envValInt, err := strconv.ParseUint(envVal, 0, 64)
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if err != nil {
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return fmt.Errorf("could not parse %s as uint value for flag %s: %s", envVal, f.Name, err)
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}
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f.Value = uint(envValInt)
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}
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eachName(f.Name, func(name string) {
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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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return
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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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// 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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return lookupUint(name, c.flagSet)
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}
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// GlobalUint looks up the value of a global UintFlag, returns
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// 0 if not found
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func (c *Context) GlobalUint(name string) uint {
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if fs := lookupGlobalFlagSet(name, c); 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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