docs: document the config file

cmd/config.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"os"
+	"strings"
+
+	"github.com/0xPolygon/cdk/config"
+	"github.com/urfave/cli/v2"
+)
+
+func configCmd(*cli.Context) error {
+	// var files []config.FileData
+	// fileData := make([]config.FileData, 0)
+	// fileData = append(fileData, config.FileData{Name: "default_mandatory_vars", Content: config.DefaultMandatoryVars})
+	// fileData = append(fileData, config.FileData{Name: "default_vars", Content: config.DefaultVars})
+	// fileData = append(fileData, config.FileData{Name: "default_values", Content: config.DefaultValues})
+	// fileData = append(fileData, files...)
+	// String buffer to concatenate all the default config vars
+	defaultConfig := strings.Builder{}
+	defaultConfig.WriteString(config.DefaultMandatoryVars)
+	defaultConfig.WriteString(config.DefaultVars)
+	defaultConfig.WriteString(config.DefaultValues)
+
+	// merger := config.NewConfigRender(fileData, config.EnvVarPrefix)
+
+	// renderedCfg, err := merger.Render()
+	// if err != nil {
+	// 	return err
+	// }
+
+	_, err := os.Stdout.WriteString(defaultConfig.String())
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

cmd/main.go

@@ -62,6 +62,13 @@ var (
 		Usage:    "Allow that config-files contains deprecated fields",
 		Required: false,
 	}
+
+	extendedConfigFlag = cli.StringFlag{
+		Name:     config.FlagExtendedConfig,
+		Aliases:  []string{"e"},
+		Usage:    "Save final configuration into to the indicated path (name: cdk-node-config.toml)",
+		Required: false,
+	}
 )
 
 func main() {
@@ -90,6 +97,13 @@ func main() {
 			Action:  start,
 			Flags:   append(flags, &customNetworkFlag),
 		},
+		{
+			Name:    "config",
+			Aliases: []string{},
+			Usage:   "Output a default configuration file",
+			Action:  configCmd,
+			Flags:   []cli.Flag{&extendedConfigFlag},
+		},
 	}
 
 	err := app.Run(os.Args)

config/config.go

@@ -58,6 +58,8 @@ const (
 	FlagDisableDefaultConfigVars = "disable-default-config-vars"
 	// FlagAllowDeprecatedFields is the flag to allow deprecated fields
 	FlagAllowDeprecatedFields = "allow-deprecated-fields"
+	// FlagExtendedConfig is the flag to print extended configuration
+	FlagExtendedConfig = "extended"
 
 	deprecatedFieldSyncDB = "Aggregator.Synchronizer.DB is deprecated. Use Aggregator.Synchronizer.SQLDB instead."