first commit

descriptor/descriptor.go

@@ -0,0 +1,89 @@
+package descriptor
+
+import (
+	"context"
+	"errors"
+	"sync"
+
+	"gitoa.ru/go-4devs/console/input"
+	"gitoa.ru/go-4devs/console/output"
+)
+
+var ErrDescriptorNotFound = errors.New("descriptor not found")
+
+//nolint: gochecknoglobals
+var (
+	descriptors = map[string]Descriptor{
+		"txt": &txt{},
+	}
+	descriptorMu sync.Mutex
+)
+
+type Command struct {
+	Bin         string
+	Name        string
+	Description string
+	Help        string
+	Definition  *input.Definition
+}
+
+type Commands struct {
+	Namespace  string
+	Definition *input.Definition
+	Commands   []NSCommand
+}
+
+type NSCommand struct {
+	Name     string
+	Commands []ShortCommand
+}
+
+func (n *NSCommand) Append(name, desc string) {
+	n.Commands = append(n.Commands, ShortCommand{Name: name, Description: desc})
+}
+
+type ShortCommand struct {
+	Name        string
+	Description string
+}
+
+type Descriptor interface {
+	Command(ctx context.Context, out output.Output, cmd Command) error
+	Commands(ctx context.Context, out output.Output, cmds Commands) error
+}
+
+func Find(name string) (Descriptor, error) {
+	descriptorMu.Lock()
+	defer descriptorMu.Unlock()
+
+	if d, has := descriptors[name]; has {
+		return d, nil
+	}
+
+	return nil, ErrDescriptorNotFound
+}
+
+func Descriptors() []string {
+	names := make([]string, 0, len(descriptors))
+
+	for name := range descriptors {
+		names = append(names, name)
+	}
+
+	return names
+}
+
+func Register(name string, descriptor Descriptor) {
+	descriptorMu.Lock()
+	defer descriptorMu.Unlock()
+
+	if descriptor == nil {
+		panic("console: Register descriptor is nil")
+	}
+
+	if _, has := descriptors[name]; has {
+		panic("console: Register called twice for descriptor " + name)
+	}
+
+	descriptors[name] = descriptor
+}