Add a way to disable one or more languages

This commit adds a new config setting:

```toml
disableLanguages = ["fr"]
```

If this is a multilingual site:

* No site for the French language will be created
* French content pages will be ignored/not read
* The French language configuration (menus etc.) will also be ignored

This makes it possible to start translating new languages and turn it on when you're happy etc.

Fixes #4297
Fixed #4329

1 files changed, 8 insertions, 1 deletions

diff --git a/source/sourceSpec.go b/source/sourceSpec.go
index 74a754a26..e40010162 100644
--- a/source/sourceSpec.go
+++ b/source/sourceSpec.go
@@ -35,6 +35,7 @@ type SourceSpec struct {
 
 	Languages              map[string]interface{}
 	DefaultContentLanguage string
+	DisabledLanguages      map[string]bool
 }
 
 // NewSourceSpec initializes SourceSpec using languages from a given configuration.
@@ -42,6 +43,12 @@ func NewSourceSpec(cfg config.Provider, fs *hugofs.Fs) *SourceSpec {
 	defaultLang := cfg.GetString("defaultContentLanguage")
 	languages := cfg.GetStringMap("languages")
 
+	disabledLangsSet := make(map[string]bool)
+
+	for _, disabledLang := range cfg.GetStringSlice("disableLanguages") {
+		disabledLangsSet[disabledLang] = true
+	}
+
 	if len(languages) == 0 {
 		l := helpers.NewDefaultLanguage(cfg)
 		languages[l.Lang] = l
@@ -62,7 +69,7 @@ func NewSourceSpec(cfg config.Provider, fs *hugofs.Fs) *SourceSpec {
 		}
 	}
 
-	return &SourceSpec{ignoreFilesRe: regexps, Cfg: cfg, Fs: fs, Languages: languages, DefaultContentLanguage: defaultLang}
+	return &SourceSpec{ignoreFilesRe: regexps, Cfg: cfg, Fs: fs, Languages: languages, DefaultContentLanguage: defaultLang, DisabledLanguages: disabledLangsSet}
 }
 
 func (s *SourceSpec) IgnoreFile(filename string) bool {