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package hst
import (
"encoding/json"
"fmt"
"strings"
"syscall"
)
// Enablement represents an optional host service to export to the target user.
type Enablement byte
const (
EWayland Enablement = 1 << iota
EX11
EDBus
EPulse
EM
)
func (e Enablement) String() string {
switch e {
case 0:
return "(no enablements)"
case EWayland:
return "wayland"
case EX11:
return "x11"
case EDBus:
return "dbus"
case EPulse:
return "pulseaudio"
default:
buf := new(strings.Builder)
buf.Grow(32)
for i := Enablement(1); i < EM; i <<= 1 {
if e&i != 0 {
buf.WriteString(", " + i.String())
}
}
if buf.Len() == 0 {
return fmt.Sprintf("e%x", byte(e))
}
return strings.TrimPrefix(buf.String(), ", ")
}
}
// NewEnablements returns the address of [Enablement] as [Enablements].
func NewEnablements(e Enablement) *Enablements { return (*Enablements)(&e) }
// enablementsJSON is the [json] representation of the [Enablement] bit field.
type enablementsJSON struct {
Wayland bool `json:"wayland,omitempty"`
X11 bool `json:"x11,omitempty"`
DBus bool `json:"dbus,omitempty"`
Pulse bool `json:"pulse,omitempty"`
}
// Enablements is the [json] adapter for [Enablement].
type Enablements Enablement
// Unwrap returns the underlying [Enablement].
func (e *Enablements) Unwrap() Enablement {
if e == nil {
return 0
}
return Enablement(*e)
}
func (e *Enablements) MarshalJSON() ([]byte, error) {
if e == nil {
return nil, syscall.EINVAL
}
return json.Marshal(&enablementsJSON{
Wayland: Enablement(*e)&EWayland != 0,
X11: Enablement(*e)&EX11 != 0,
DBus: Enablement(*e)&EDBus != 0,
Pulse: Enablement(*e)&EPulse != 0,
})
}
func (e *Enablements) UnmarshalJSON(data []byte) error {
if e == nil {
return syscall.EINVAL
}
v := new(enablementsJSON)
if err := json.Unmarshal(data, &v); err != nil {
return err
}
var ve Enablement
if v.Wayland {
ve |= EWayland
}
if v.X11 {
ve |= EX11
}
if v.DBus {
ve |= EDBus
}
if v.Pulse {
ve |= EPulse
}
*e = Enablements(ve)
return nil
}
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