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registry.go
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registry.go
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package template
import (
"fmt"
"strings"
"sync"
"github.com/mandelsoft/goutils/errors"
"github.com/mandelsoft/vfs/pkg/vfs"
"github.com/open-component-model/ocm/pkg/utils"
)
const KIND_TEMPLATER = "templater"
type TemplaterFactory func(system vfs.FileSystem) Templater
type Registry interface {
Register(name string, fac TemplaterFactory, desc string)
Create(name string, fs vfs.FileSystem) (Templater, error)
Describe(name string) (string, error)
KnownTypeNames() []string
}
type templaterInfo struct {
templater TemplaterFactory
description string
}
type registry struct {
lock sync.RWMutex
templaters map[string]templaterInfo
}
func NewRegistry() Registry {
return ®istry{
templaters: map[string]templaterInfo{},
}
}
func (r *registry) Register(name string, fac TemplaterFactory, desc string) {
r.lock.Lock()
defer r.lock.Unlock()
r.templaters[name] = templaterInfo{
templater: fac,
description: desc,
}
}
func (r *registry) Create(name string, fs vfs.FileSystem) (Templater, error) {
r.lock.RLock()
defer r.lock.RUnlock()
t, ok := r.templaters[name]
if !ok {
return nil, errors.ErrNotSupported(KIND_TEMPLATER, name)
}
return t.templater(fs), nil
}
func (r *registry) Describe(name string) (string, error) {
r.lock.RLock()
defer r.lock.RUnlock()
t, ok := r.templaters[name]
if !ok {
return "", errors.ErrNotSupported(KIND_TEMPLATER, name)
}
return t.description, nil
}
func (r *registry) KnownTypeNames() []string {
r.lock.RLock()
defer r.lock.RUnlock()
return utils.StringMapKeys(r.templaters)
}
func Usage(scheme Registry) string {
s := `
There are several templaters that can be selected by the <code>--templater</code> option:
`
for _, t := range scheme.KnownTypeNames() {
desc, err := scheme.Describe(t)
if err == nil {
var title string
idx := strings.Index(desc, "\n")
if idx >= 0 {
title = desc[:idx]
desc = desc[idx+1:]
}
if strings.TrimSpace(desc) == "" {
s = fmt.Sprintf("%s- <code>%s</code> %s\n\n", s, t, title)
} else {
s = fmt.Sprintf("%s- <code>%s</code> %s\n\n%s", s, t, title, utils.IndentLines(desc, " "))
}
if !strings.HasSuffix(s, "\n") {
s += "\n"
}
}
}
return s
}
var _registry = NewRegistry()
func Register(name string, fac TemplaterFactory, desc string) {
_registry.Register(name, fac, desc)
}
func DefaultRegistry() Registry {
return _registry
}