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cal.go
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cal.go
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// Package cal enables control over arbitrary 3rd party calendars. It implements
// a standardized interface through which Google Calendar, Outlook and more can
// be supported. It's up to individual drivers to add support for each of these
// calendars.
//
// This design is similar to golang.org/pkg/database/sql which defines an
// interface and has drivers which implement that interface for various
// databases.
package cal
import (
"database/sql/driver"
"sort"
"sync"
)
var driversMu sync.RWMutex
var drivers = make(map[string]driver.Driver)
// Register makes a calendar driver available by the provided name. If Register
// is called twice with the same name or if driver is nill, it panics.
func Register(name string, driver driver.Driver) {
driversMu.Lock()
defer driversMu.Unlock()
if driver == nil {
panic("cal: Register driver is nil")
}
if _, dup := drivers[name]; dup {
panic("cal: Register called twice for driver " + name)
}
drivers[name] = driver
}
// Drivers returns a sorted list of the names of the registered drivers.
func Drivers() []string {
driversMu.RLock()
defer driversMu.RUnlock()
var list []string
for name := range drivers {
list = append(list, name)
}
sort.Strings(list)
return list
}