installer.go

package installer

import (
	"sort"
)

type Installer interface {
	// target == "" means latest
	Install(path, name string, target string) (installed string, err error)
	ListVersions(snapshot bool) (versions []string, err error)
}

var Installers = make(map[string]Installer, 10)

func Get(name string) (installer Installer, ok bool) {
	installer, ok = Installers[name]
	return
}

func GetInstallerNames() (installers []string) {
	installers = make([]string, 0, len(Installers))
	for name, _ := range Installers {
		installers = append(installers, name)
	}
	sort.Strings(installers)
	return
}

type VersionNotFoundErr struct {
	Version string
}

func (e *VersionNotFoundErr) Error() string {
	return "Version " + e.Version + " not found"
}

type AssetNotFoundErr struct {
	Version string
	Asset   string
}

func (e *AssetNotFoundErr) Error() string {
	return "Asset " + e.Asset + " is not found in version " + e.Version
}