templatefile/cmd/templater/main.go

package main

import (
	"fmt"
	"os"

	"forge.cadoles.com/pcaseiro/templatefile/api"
	"forge.cadoles.com/pcaseiro/templatefile/pkg/templater"
	"github.com/alexflint/go-arg"
	"github.com/gin-gonic/gin"
)

func Daemon(port int) (err error) {
	r := gin.Default()

	r.POST("/generate", api.Generate)

	err = r.Run(fmt.Sprintf("0.0.0.0:%d", port)) // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
	if err != nil {
		return (err)
	}
	return nil
}

func main() {

	var args struct {
		Daemon bool   `arg:"-d,--daemon,env:TEMPLATER_DAEMON" default:"false" help:"Enable api server"`
		Port   int    `arg:"-p,--port,env:TEMPLATER_PORT" default:"8080" help:"Listening port for the api server"`
		Type   string `arg:"-t,--type,env:TEMPLATE_TYPE" default:"hcl" help:"Template type (go/template or hcl)"`
		Output string `arg:"-o,--output,env:TEMPLATER_OUTPUT" default:"stdout" help:"Destination of the result (stdout or file path)"`
		Config string `arg:"-c,--config,env:TEMPLATE_CONFIG" help:"Configuration values"`
		File   string `arg:"-f,--template-file,env:TEMPLATE_FILE" help:"Template file path"`
	}

	arg.MustParse(&args)

	if args.Daemon {
		err := Daemon(args.Port)
		if err != nil {
			panic(err)
		}
	} else {
		var config []byte
		templateType := args.Type
		templateFile := args.File
		output := args.Output

		if _, err := os.Stat(args.Config); err == nil {
			config, err = os.ReadFile(args.Config)
			if err != nil {
				panic(err)
			}
		} else {
			config = []byte(args.Config)
		}

		var file templater.ConfigFile
		file.Source = templateFile
		file.TemplateType = templateType

		result, err := file.ProcessTemplate(templateFile, config)
		if err != nil {
			panic(err)
		}
		if output == "stdout" {
			fmt.Printf("%s", result)
		} else {
			err := os.WriteFile(output, []byte(result), 0644)
			if err != nil {
				panic(err)
			}
		}
	}

}