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print the name of the env var when a required var is missing #131

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print the name of the env var when a required var is missing #131

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13 changes: 11 additions & 2 deletions cleanenv.go
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Original file line number Diff line number Diff line change
Expand Up @@ -429,9 +429,18 @@ func readEnvVars(cfg interface{}, update bool) error {
}

if rawValue == nil && meta.required && meta.isFieldValueZero() {
if len(meta.envList) == 0 {
return fmt.Errorf("env list for field %q is empty but is set as required", meta.fieldName)
}
if len(meta.envList) == 1 {
return fmt.Errorf(
"environment variable %q is required but the value is not provided",
meta.envList[0],
)
}
return fmt.Errorf(
"field %q is required but the value is not provided",
meta.fieldName,
"environment variable %q (aliases=%v) is required but the value is not provided",
meta.envList[0], meta.envList[1:],
)
}

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