110 lines
2.4 KiB
Go
110 lines
2.4 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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// BoolFlag is a flag with type bool
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type BoolFlag 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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Destination *bool
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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 BoolFlag) 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 BoolFlag) 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 BoolFlag) 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 BoolFlag) TakesValue() bool {
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return false
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}
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// GetUsage returns the usage string for the flag
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func (f BoolFlag) GetUsage() string {
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return f.Usage
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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 BoolFlag) GetValue() string {
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return ""
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}
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// Bool looks up the value of a local BoolFlag, returns
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// false if not found
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func (c *Context) Bool(name string) bool {
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return lookupBool(name, c.flagSet)
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}
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// GlobalBool looks up the value of a global BoolFlag, returns
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// false if not found
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func (c *Context) GlobalBool(name string) bool {
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if fs := lookupGlobalFlagSet(name, c); fs != nil {
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return lookupBool(name, fs)
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}
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return false
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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 BoolFlag) 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 BoolFlag) ApplyWithError(set *flag.FlagSet) error {
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val := false
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if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
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if envVal == "" {
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val = false
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} else {
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envValBool, err := strconv.ParseBool(envVal)
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if err != nil {
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return fmt.Errorf("could not parse %s as bool value for flag %s: %s", envVal, f.Name, err)
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}
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val = envValBool
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}
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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.BoolVar(f.Destination, name, val, f.Usage)
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return
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}
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set.Bool(name, val, f.Usage)
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})
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return nil
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}
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func lookupBool(name string, set *flag.FlagSet) bool {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := strconv.ParseBool(f.Value.String())
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if err != nil {
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return false
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}
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return parsed
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}
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return false
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}
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