Add plugin init. Update plugin signature.

v3/internal/plugins/plugins.go

@@ -0,0 +1,36 @@
+package plugins
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+
+	"github.com/wailsapp/wails/v3/internal/flags"
+
+	"github.com/leaanthony/gosod"
+
+	"github.com/samber/lo"
+)
+
+//go:embed template
+var pluginTemplate embed.FS
+
+type TemplateOptions struct {
+	*flags.PluginInit
+}
+
+func Install(options *flags.PluginInit) error {
+
+	if options.OutputDir == "." || options.OutputDir == "" {
+		options.OutputDir = filepath.Join(lo.Must(os.Getwd()), options.Name)
+	}
+	fmt.Printf("Creating plugin '%s' into '%s'\n", options.Name, options.OutputDir)
+	tfs, err := fs.Sub(pluginTemplate, "template")
+	if err != nil {
+		return err
+	}
+
+	return gosod.New(tfs).Extract(options.OutputDir, options)
+}