111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
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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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)
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// Generic is a generic parseable type identified by a specific flag
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type Generic interface {
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Set(value string) error
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String() string
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}
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// GenericFlag is a flag with type Generic
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type GenericFlag 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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TakesFile bool
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Value Generic
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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 GenericFlag) 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 GenericFlag) 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 GenericFlag) 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 GenericFlag) 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 GenericFlag) 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 GenericFlag) GetValue() string {
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if f.Value != nil {
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return f.Value.String()
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}
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return ""
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}
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// Apply takes the flagset and calls Set on the generic flag with the value
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// provided by the user for parsing by the flag
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// Ignores parsing errors
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func (f GenericFlag) Apply(set *flag.FlagSet) {
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_ = f.ApplyWithError(set)
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}
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// ApplyWithError takes the flagset and calls Set on the generic flag with the value
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// provided by the user for parsing by the flag
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func (f GenericFlag) ApplyWithError(set *flag.FlagSet) error {
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val := f.Value
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if fileEnvVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
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if err := val.Set(fileEnvVal); err != nil {
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return fmt.Errorf("could not parse %s as value for flag %s: %s", fileEnvVal, f.Name, err)
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}
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}
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eachName(f.Name, func(name string) {
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set.Var(f.Value, name, f.Usage)
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})
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return nil
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}
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// Generic looks up the value of a local GenericFlag, returns
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// nil if not found
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func (c *Context) Generic(name string) interface{} {
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return lookupGeneric(name, c.flagSet)
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}
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// GlobalGeneric looks up the value of a global GenericFlag, returns
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// nil if not found
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func (c *Context) GlobalGeneric(name string) interface{} {
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if fs := lookupGlobalFlagSet(name, c); fs != nil {
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return lookupGeneric(name, fs)
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}
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return nil
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}
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func lookupGeneric(name string, set *flag.FlagSet) interface{} {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := f.Value, error(nil)
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if err != nil {
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return nil
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}
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return parsed
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}
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return nil
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}
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