toml-merge.go

package main

import (
	"encoding/json"
	"flag"
	"log"
	"os"
	"path"

	"github.com/BurntSushi/toml"
)

var (
	flagOutputJSON  = false
	flagShowVersion = false
	version         = "99.99-local"
)

func init() {
	log.SetFlags(0)

	flag.BoolVar(&flagOutputJSON, "output-json", flagOutputJSON, "Output JSON instead of TOML")
	flag.BoolVar(&flagShowVersion, "version", flagShowVersion, "Show version")

	flag.Usage = usage
	flag.Parse()
}

func usage() {
	log.Printf("Usage: %s toml-file [ toml-file ... ]\n", path.Base(os.Args[0]))
	flag.PrintDefaults()

	os.Exit(1)
}

func main() {
	if flagShowVersion {
		log.Printf("toml-merge version %s\n", version)
		os.Exit(0)
	}

	if flag.NArg() < 1 {
		flag.Usage()
	}
	var output = make(map[string]interface{})
	output["__autogenerated_do_not_modify__"] =
		"This file was automatically generated. Please do not modify."

	for _, f := range flag.Args() {
		var tmp map[string]interface{}
		_, err := toml.DecodeFile(f, &tmp)
		if err != nil {
			log.Fatalf("Error in '%s': %s", f, err)
		}
		for k, v := range tmp {
			output[k] = v
		}
	}

	if flagOutputJSON {
		jsonwrt := json.NewEncoder(os.Stdout)
		jsonwrt.SetIndent("", "  ")
		jsonwrt.Encode(output)
	} else {
		tomlrt := toml.NewEncoder(os.Stdout)
		tomlrt.Encode(output)
	}
}