forked from docker/app
/
renderer.go
63 lines (57 loc) · 1.43 KB
/
renderer.go
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package renderer
import (
"sort"
"sync"
"github.com/docker/app/internal/renderer/driver"
"github.com/pkg/errors"
)
var (
driversMu sync.RWMutex
drivers = map[string]driver.Driver{}
)
// Register makes a renderer available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, driver driver.Driver) {
driversMu.Lock()
defer driversMu.Unlock()
if driver == nil {
panic("renderer: Register driver is nil")
}
if _, dup := drivers[name]; dup {
panic("renderer: Register called twice for driver " + name)
}
drivers[name] = driver
}
// Apply applies the specified render to the specified string with the specified settings.
// If the render is not present is the registered ones, it errors out.
func Apply(s string, settings map[string]interface{}, renderers ...string) (string, error) {
var err error
for _, r := range renderers {
if r == "none" {
continue
}
driversMu.RLock()
d, present := drivers[r]
driversMu.RUnlock()
if !present {
return "", errors.Errorf("unknown renderer %s", r)
}
s, err = d.Apply(s, settings)
if err != nil {
return "", err
}
}
return s, nil
}
// Drivers returns a sorted list of the names of the registered drivers.
func Drivers() []string {
list := []string{"none"}
driversMu.RLock()
for name := range drivers {
list = append(list, name)
}
driversMu.RUnlock()
sort.Strings(list)
return list
}