googleapis
diff --git a/‎cmd/root.go‎
Lines changed: 5 additions & 1 deletion b/‎cmd/root.go‎
Lines changed: 5 additions & 1 deletion
diff --git a/‎docs/en/getting-started/configure.md‎
Lines changed: 5 additions & 0 deletions b/‎docs/en/getting-started/configure.md‎
Lines changed: 5 additions & 0 deletions
@@ -265,8 +265,9 @@ type ToolsFile struct {
 }
 
 // parseEnv replaces environment variables ${ENV_NAME} with their values.
+// also support ${ENV_NAME:default_value}.
 func parseEnv(input string) (string, error) {
- re := regexp.MustCompile(`\$\{(\w+)\}`)
+ re := regexp.MustCompile(`\$\{(\w+)(:(\w+))?\}`)
 
  var err error
  output := re.ReplaceAllStringFunc(input, func(match string) string {
@@ -277,6 +278,9 @@ func parseEnv(input string) (string, error) {
  if value, found := os.LookupEnv(variableName); found {
  return value
 		}
+ if len(parts) == 4 {
+ return parts[3]
+		}
  err = fmt.Errorf("environment variable not found: %q", variableName)
  return ""
 	})
 
@@ -22,6 +22,11 @@ etc., you could use environment variables instead with the format `${ENV_NAME}`.
  user: ${USER_NAME}
  password: ${PASSWORD}
 ```
+A default value can be specified like `${ENV_NAME:default}`.
+
+```yaml
+  port: ${DB_PORT:3306}
+```
 
 ### Sources