shithub: hugo

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hugolib: Add validation for defaultContentLanguage

When `languages` are defined, then `defaultContentLanguage` must match one of those.

Fixes #4298

--- a/hugolib/config.go

+++ b/hugolib/config.go

@@ -131,6 +131,22 @@

 		}

 	}

+	defaultLang := cfg.GetString("defaultContentLanguage")

+

+	// The defaultContentLanguage is something the user has to decide, but it needs

+	// to match a language in the language definition list.

+	langExists := false

+	for _, lang := range langs {

+		if lang.Lang == defaultLang {

+			langExists = true

+			break

+		}

+	}

+

+	if !langExists {

+		return fmt.Errorf("site config value %q for defaultContentLanguage does not match any language definition", defaultLang)

+	}

+

 	cfg.Set("languagesSorted", langs)

 	cfg.Set("multilingual", len(langs) > 1)