add basic plugin architecture

.gitignore

@@ -0,0 +1 @@
+dist/

cmd/char/ls.go

@@ -15,20 +15,23 @@ func NewLsCommand() *cobra.Command {
 
 			r, err := register.
 				NewPluginRegisterBuilder().
-				Add("gocli", "").
+				Add("gocli", "plugins/gocli/main.go").
+				Add("rust", "plugins/rust/main.go").
 				Build(ctx)
 			if err != nil {
 				return err
 			}
+			defer r.Close()
 
 			about, err := r.About(ctx)
 			if err != nil {
 				return err
 			}
 
-			for plugin, aboutText := range about {
-				fmt.Printf("plugin: %s\n", plugin)
-				fmt.Printf("\tabout: %s\n", aboutText)
+			for _, a := range about {
+				fmt.Printf("plugin: %s\n", a.Name)
+				fmt.Printf("\tversion: %s\n", a.Version)
+				fmt.Printf("\tabout: %s\n", a.About)
 				fmt.Println()
 			}
 

examples/basic/.char/plugins/rust

@@ -0,0 +1 @@
+../../../../

examples/basic/char.yml

@@ -0,0 +1,4 @@
+registry: git.front.kjuulh.io
+plugins:
+  "kjuulh/char#plugins/gocli": {}
+  "kjuulh/char#plugins/rust": {}

examples/basic/test.sh

@@ -1,3 +1,5 @@
 #!/bin/bash
 
-go run ../../main.go ls
+go build -o char ../../main.go
+
+CHAR_DEV_MODE=true ./char ls

pkg/plugins/script/script.go

@@ -1 +0,0 @@
-package script

pkg/register/plugin.go

@@ -1,5 +1,13 @@
 package register
 
-type Plugin interface {
-	About() string
+import "context"
+
+type About struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+	About   string `json:"about"`
+}
+
+type Plugin interface {
+	About(ctx context.Context) (*About, error)
 }

pkg/register/plugin_api.go

@@ -7,6 +7,7 @@ import (
 )
 
 type PluginAPI struct {
+	path string
 	Impl Plugin
 }
 

pkg/register/plugin_builder.go

@@ -14,7 +14,7 @@ type PluginBuilder struct {
 
 func NewPluginBuilder(name string, p Plugin) *PluginBuilder {
 	logger := hclog.New(&hclog.LoggerOptions{
-		Level:      hclog.Trace,
+		Level:      hclog.Error,
 		Output:     os.Stderr,
 		JSONFormat: false,
 	})

pkg/register/plugin_client.go

@@ -1,7 +1,8 @@
 package register
 
 import (
-	"log"
+	"context"
+	"encoding/json"
 	"net/rpc"
 )
 
@@ -11,12 +12,18 @@ type PluginClient struct {
 
 var _ Plugin = &PluginClient{}
 
-func (pc *PluginClient) About() string {
+func (pc *PluginClient) About(ctx context.Context) (*About, error) {
 	var resp string
 	err := pc.client.Call("Plugin.About", new(any), &resp)
 	if err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 
-	return resp
+	var about About
+	err = json.Unmarshal([]byte(resp), &about)
+	if err != nil {
+		return nil, err
+	}
+
+	return &about, nil
 }

pkg/register/plugin_register.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log"
 	"os"
 	"os/exec"
 
@@ -23,7 +24,9 @@ func NewPluginRegisterBuilder() *PluginRegisterBuilder {
 }
 
 func (pr *PluginRegisterBuilder) Add(name, path string) *PluginRegisterBuilder {
-	pr.plugins[name] = PluginAPI{}
+	pr.plugins[name] = PluginAPI{
+		path: path,
+	}
 
 	return pr
 }
@@ -32,10 +35,38 @@ func (pr *PluginRegisterBuilder) Build(ctx context.Context) (*PluginRegister, er
 	clients := make(map[string]*pluginClientWrapper, 0)
 	errgroup, _ := errgroup.WithContext(ctx)
 
+	if err := os.MkdirAll(".char/plugins/", 0755); err != nil {
+		return nil, err
+	}
+
 	for name, p := range pr.plugins {
 		name, p := name, p
 
 		errgroup.Go(func() error {
+			pluginPath := fmt.Sprintf(".char/plugins/%s/dist/%s", name, name)
+
+			_, err := os.Stat(pluginPath)
+			if err != nil || os.Getenv("CHAR_DEV_MODE") == "true" {
+				log.Printf("building: %s", name)
+				cmd := exec.Command(
+					"sh",
+					"-c",
+					fmt.Sprintf(
+						"(cd .char/plugins/%s; go build -o dist/%s %s)",
+						name,
+						name,
+						p.path,
+					),
+				)
+				output, err := cmd.CombinedOutput()
+				if len(output) > 0 {
+					log.Println(string(output))
+				}
+				if err != nil {
+					return fmt.Errorf("could not build plugin: %w", err)
+				}
+			}
+
 			client := plugin.NewClient(&plugin.ClientConfig{
 				HandshakeConfig: plugin.HandshakeConfig{
 					ProtocolVersion:  1,
@@ -45,13 +76,15 @@ func (pr *PluginRegisterBuilder) Build(ctx context.Context) (*PluginRegister, er
 				Logger: hclog.New(&hclog.LoggerOptions{
 					Name:   "char",
 					Output: os.Stdout,
-					Level:  hclog.Debug,
+					Level:  hclog.Error,
 				}),
-				Cmd: exec.Command("sh", "-c", fmt.Sprintf(
-					"(cd ./.char/plugins/%s; go run plugins/%s/main.go)",
+				Cmd: exec.Command(
+					fmt.Sprintf(
+						".char/plugins/%s/dist/%s",
 						name,
 						name,
-				)),
+					),
+				),
 				Plugins: map[string]plugin.Plugin{
 					name: &p,
 				},
@@ -126,17 +159,30 @@ func (pr *PluginRegister) Close() error {
 	return nil
 }
 
-func (pr *PluginRegister) About(ctx context.Context) (map[string]string, error) {
-	list := make(map[string]string, len(pr.clients))
+type AboutItem struct {
+	Name    string
+	Version string
+	About   string
+}
+
+func (pr *PluginRegister) About(ctx context.Context) ([]AboutItem, error) {
+	list := make([]AboutItem, 0)
 
 	errgroup, ctx := errgroup.WithContext(ctx)
 
 	for n, c := range pr.clients {
 		n, c := n, c
 		errgroup.Go(func() error {
-			about := c.plugin.About()
+			about, err := c.plugin.About(ctx)
+			if err != nil {
+				return err
+			}
 
-			list[n] = about
+			list = append(list, AboutItem{
+				Name:    n,
+				Version: about.Version,
+				About:   about.About,
+			})
 			return nil
 		})
 	}

pkg/register/plugin_server.go

@@ -1,10 +1,25 @@
 package register
 
+import (
+	"context"
+	"encoding/json"
+)
+
 type PluginServer struct {
 	Impl Plugin
 }
 
 func (ps *PluginServer) About(args any, resp *string) error {
-	*resp = ps.Impl.About()
+	r, err := ps.Impl.About(context.Background())
+	if err != nil {
+		return err
+	}
+
+	respB, err := json.Marshal(r)
+	if err != nil {
+		return err
+	}
+
+	*resp = string(respB)
 	return nil
 }

plugins/gocli/main.go

@@ -10,9 +10,12 @@ import (
 type GoCliPlugin struct {
 }
 
-// About implements register.Plugin
-func (*GoCliPlugin) About() string {
-	return "gocli"
+func (*GoCliPlugin) About(ctx context.Context) (*register.About, error) {
+	return &register.About{
+		Name:    "gocli",
+		Version: "v0.0.1",
+		About:   "golang cli provides a set of actions and presets supporting golang development",
+	}, nil
 }
 
 var _ register.Plugin = &GoCliPlugin{}

plugins/rust/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"context"
+	"log"
+
+	"git.front.kjuulh.io/kjuulh/char/pkg/register"
+)
+
+type GoCliPlugin struct {
+}
+
+func (*GoCliPlugin) About(ctx context.Context) (*register.About, error) {
+	return &register.About{
+		Name:    "rust",
+		Version: "v0.0.1",
+		About:   "golang cli provides a set of actions and presets supporting golang development",
+	}, nil
+}
+
+var _ register.Plugin = &GoCliPlugin{}
+
+func main() {
+	if err := register.
+		NewPluginBuilder(
+			"rust",
+			&GoCliPlugin{},
+		).
+		Serve(context.Background()); err != nil {
+		log.Fatal(err)
+	}
+}