caps: Move most capability-handling types into the caps package

irc/caps/values.go

@@ -0,0 +1,42 @@
+package caps
+
+import "sync"
+
+// Values holds capability values.
+type Values struct {
+	sync.RWMutex
+	// values holds our actual capability values.
+	values map[Capability]string
+}
+
+// NewValues returns a new Values.
+func NewValues() *Values {
+	return &Values{
+		values: make(map[Capability]string),
+	}
+}
+
+// Set sets the value for the given capability.
+func (v *Values) Set(capab Capability, value string) {
+	v.Lock()
+	defer v.Unlock()
+
+	v.values[capab] = value
+}
+
+// Unset removes the value for the given capability, if it exists.
+func (v *Values) Unset(capab Capability) {
+	v.Lock()
+	defer v.Unlock()
+
+	delete(v.values, capab)
+}
+
+// Get returns the value of the given capability, and whether one exists.
+func (v *Values) Get(capab Capability) (string, bool) {
+	v.RLock()
+	defer v.RUnlock()
+
+	value, exists := v.values[capab]
+	return value, exists
+}