120 lines
2.5 KiB
Go
120 lines
2.5 KiB
Go
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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// StringFlag is a flag with type string
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type StringFlag 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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TakesFile bool
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Value string
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DefaultText string
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Destination *string
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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 *StringFlag) 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 *StringFlag) 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 *StringFlag) 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 *StringFlag) 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 *StringFlag) 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 *StringFlag) 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 *StringFlag) GetValue() string {
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return f.Value
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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 *StringFlag) IsVisible() bool {
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return !f.Hidden
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}
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// GetDefaultText returns the default text for this flag
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func (f *StringFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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if f.Value == "" {
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return f.Value
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}
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return fmt.Sprintf("%q", f.Value)
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}
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// GetEnvVars returns the env vars for this flag
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func (f *StringFlag) GetEnvVars() []string {
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return f.EnvVars
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}
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// Apply populates the flag given the flag set and environment
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func (f *StringFlag) Apply(set *flag.FlagSet) error {
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if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
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f.Value = val
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f.HasBeenSet = true
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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.StringVar(f.Destination, name, f.Value, f.Usage)
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continue
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}
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set.String(name, f.Value, f.Usage)
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}
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return nil
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}
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// String looks up the value of a local StringFlag, returns
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// "" if not found
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func (c *Context) String(name string) string {
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if fs := c.lookupFlagSet(name); fs != nil {
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return lookupString(name, fs)
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}
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return ""
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}
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func lookupString(name string, set *flag.FlagSet) string {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := f.Value.String(), error(nil)
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if err != nil {
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return ""
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}
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return parsed
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}
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return ""
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}
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