Added basic env var substitution in config for from-file load #201

cmd/from-file.go

@@ -9,6 +9,9 @@ package cmd
 import (
  "io/ioutil"
  "log"
+ "os"
+ "regexp"
+ "strings"
 
  "github.com/spf13/cobra"
  "github.com/yyyar/gobetween/config"
@@ -42,10 +45,15 @@ var FromFileCmd = &cobra.Command{
  }
 
  var cfg config.Config
- if err = codec.Decode(string(data), &cfg, format); err != nil {
+
+ datastr := mapEnvVars(string(data))
+
+ if err = codec.Decode(datastr, &cfg, format); err != nil {
  log.Fatal(err)
  }
 
+ log.Println(cfg)
+
  info.Configuration = struct {
  Kind string `json:"kind"`
  Path string `json:"path"`
@@ -54,3 +62,17 @@ var FromFileCmd = &cobra.Command{
  start(&cfg)
  },
 }
+
+//
+// mapEnvVars replaces placeholders ${...} with env var value
+//
+func mapEnvVars(data string) string {
+
+ var re = regexp.MustCompile(`\${.*?}`)
+
+ vars := re.FindAllString(data, -1)
+ for _, v := range vars {
+ data = strings.ReplaceAll(data, v, os.Getenv(v[2:len(v)-1]))
+ }
+ return data
+}