193 lines
3.6 KiB
Go
193 lines
3.6 KiB
Go
package cli
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import "fmt"
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import "flag"
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import "strconv"
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import "strings"
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// Flag is a common interface related to parsing flags in cli.
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// For more advanced flag parsing techniques, it is recomended that
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// this interface be implemented.
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type Flag interface {
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fmt.Stringer
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// Apply Flag settings to the given flag set
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Apply(*flag.FlagSet)
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getName() string
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}
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func flagSet(name string, flags []Flag) *flag.FlagSet {
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set := flag.NewFlagSet(name, flag.ContinueOnError)
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for _, f := range flags {
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f.Apply(set)
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}
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return set
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}
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func eachName(longName string, fn func(string)) {
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parts := strings.Split(longName, ",")
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for _, name := range parts {
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name = strings.Trim(name, " ")
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fn(name)
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}
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}
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type StringSlice []string
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func (f *StringSlice) Set(value string) error {
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*f = append(*f, value)
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return nil
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}
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func (f *StringSlice) String() string {
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return fmt.Sprintf("%s", *f)
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}
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func (f *StringSlice) Value() []string {
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return *f
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}
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type StringSliceFlag struct {
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Name string
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Value *StringSlice
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Usage string
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}
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func (f StringSliceFlag) String() string {
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return fmt.Sprintf("%s '%v'\t%v", prefixFor(f.Name), f.Name, "-"+f.Name+" option -"+f.Name+" option", f.Usage)
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}
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func (f StringSliceFlag) Apply(set *flag.FlagSet) {
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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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}
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func (f StringSliceFlag) getName() string {
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return f.Name
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}
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type IntSlice []int
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func (f *IntSlice) Set(value string) error {
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tmp, err := strconv.Atoi(value)
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if err != nil {
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return err
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} else {
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*f = append(*f, tmp)
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}
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return nil
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}
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func (f *IntSlice) String() string {
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return fmt.Sprintf("%d", *f)
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}
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func (f *IntSlice) Value() []int {
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return *f
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}
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type IntSliceFlag struct {
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Name string
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Value *IntSlice
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Usage string
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}
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func (f IntSliceFlag) String() string {
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firstName := strings.Trim(strings.Split(f.Name, ",")[0], " ")
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pref := prefixFor(firstName)
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return fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), pref+firstName+" option "+pref+firstName+" option", f.Usage)
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}
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func (f IntSliceFlag) Apply(set *flag.FlagSet) {
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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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}
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func (f IntSliceFlag) getName() string {
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return f.Name
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}
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type BoolFlag struct {
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Name string
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Usage string
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}
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func (f BoolFlag) String() string {
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return fmt.Sprintf("%s\t%v", prefixedNames(f.Name), f.Usage)
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}
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func (f BoolFlag) Apply(set *flag.FlagSet) {
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eachName(f.Name, func(name string) {
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set.Bool(name, false, f.Usage)
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})
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}
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func (f BoolFlag) getName() string {
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return f.Name
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}
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type StringFlag struct {
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Name string
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Value string
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Usage string
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}
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func (f StringFlag) String() string {
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return fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), f.Value, f.Usage)
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}
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func (f StringFlag) Apply(set *flag.FlagSet) {
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eachName(f.Name, func(name string) {
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set.String(name, f.Value, f.Usage)
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})
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}
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func (f StringFlag) getName() string {
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return f.Name
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}
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type IntFlag struct {
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Name string
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Value int
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Usage string
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}
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func (f IntFlag) String() string {
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return fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), f.Value, f.Usage)
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}
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func (f IntFlag) Apply(set *flag.FlagSet) {
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eachName(f.Name, func(name string) {
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set.Int(name, f.Value, f.Usage)
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})
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}
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func (f IntFlag) getName() string {
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return f.Name
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}
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func prefixFor(name string) (prefix string) {
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if len(name) == 1 {
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prefix = "-"
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} else {
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prefix = "--"
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}
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return
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}
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func prefixedNames(fullName string) (prefixed string) {
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parts := strings.Split(fullName, ",")
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for i, name := range parts {
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name = strings.Trim(name, " ")
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prefixed += prefixFor(name) + name
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if i < len(parts) - 1 {
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prefixed += ", "
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}
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}
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return
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}
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