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completion.go
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completion.go
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package zsh
import (
"bytes"
"fmt"
"html/template"
"strings"
"github.com/urfave/cli"
)
func longName(name string) string {
// "If s does not contain sep and sep is not empty, Split returns a slice of length 1 whose only element is s."
// from https://golang.org/pkg/strings/#Split
return strings.TrimSpace(strings.Split(name, ",")[0])
}
func formatFlag(name, usage string) string {
return fmt.Sprintf("--%s[%s]", longName(name), usage)
}
func formatFlagFunc() func(cli.Flag) (string, error) {
return func(f cli.Flag) (string, error) {
switch ft := f.(type) {
case cli.BoolFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.Float64Flag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.GenericFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.Int64Flag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.Int64SliceFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.IntFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.IntSliceFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.StringFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.StringSliceFlag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.Uint64Flag:
return formatFlag(ft.Name, ft.Usage), nil
case cli.UintFlag:
return formatFlag(ft.Name, ft.Usage), nil
default:
return "", fmt.Errorf("unknown type: '%T'", f)
}
}
}
// GetCompletion returns a zsh completion script
func GetCompletion(a *cli.App) (string, error) {
tplFuncs := template.FuncMap{
"formatFlag": formatFlagFunc(),
}
tpl, err := template.New("zsh").Funcs(tplFuncs).Parse(zshTemplate)
if err != nil {
return "", err
}
buf := &bytes.Buffer{}
if err := tpl.Execute(buf, a); err != nil {
return "", err
}
return buf.String(), nil
}