env2js.go

package main

import (
	"flag"
	"fmt"
	"os"
	"strings"
	"text/template"
)

type CoreContext struct {
  PAPERMERGE__OCR__LANG_CODES string
  PAPERMERGE__OCR__DEFAULT_LANG_CODE string
  PAPERMERGE__OCR__AUTOMATIC bool
}


var (
  templateFileName = flag.String("f", "", "Template file")
)

func main() {
  flag.Parse()

  if *templateFileName == "" {
    fmt.Println("Error: empty template file")
    os.Exit(1)
  }

  templ, err := template.ParseFiles(*templateFileName)
  if err != nil {
    fmt.Printf("Error while parsing template file: %v", err)
    os.Exit(1)
  }

  data := CoreContext {
    PAPERMERGE__OCR__LANG_CODES: os.Getenv("PAPERMERGE__OCR__LANG_CODES"),
    PAPERMERGE__OCR__DEFAULT_LANG_CODE: os.Getenv("PAPERMERGE__OCR__DEFAULT_LANG_CODE"),
    PAPERMERGE__OCR__AUTOMATIC: getBoolEnv("PAPERMERGE__OCR__AUTOMATIC"),
  }

  templ.Execute(os.Stdout, data)
}


func getBoolEnv(key string) bool {
  v := os.Getenv(key)

  switch strings.ToLower(v) {
  case "", "false", "no":
    return false
  case "true", "yes":
    return true
  }

  return false
}