source: Cache language config

```
benchmark                                                                                                                     old ns/op     new ns/op     delta
BenchmarkSiteBuilding/frontmatter=YAML|num_root_sections=1|num_pages=5000|tags_per_page=0|shortcodes=false|render=false-4     552742744     501838152     -9.21%

benchmark                                                                                                                     old allocs     new allocs     delta
BenchmarkSiteBuilding/frontmatter=YAML|num_root_sections=1|num_pages=5000|tags_per_page=0|shortcodes=false|render=false-4     3047393        2957378        -2.95%

benchmark                                                                                                                     old bytes     new bytes     delta
BenchmarkSiteBuilding/frontmatter=YAML|num_root_sections=1|num_pages=5000|tags_per_page=0|shortcodes=false|render=false-4     356533864     354291924     -0.63%
```

diff --git a/source/file.go b/source/file.go
index 1dff9ac0bde4fafb6387e1dbc40e94f52e487800..13352429e8ca144bbd636c0cf49ce0f29e99b3d8 100644 (file)
--- a/source/file.go
+++ b/source/file.go
@@ -27,10 +27,15 @@ import (
 type SourceSpec struct {
        Cfg config.Provider
        Fs  *hugofs.Fs
+
+       languages              map[string]interface{}
+       defaultContentLanguage string
 }
 
 func NewSourceSpec(cfg config.Provider, fs *hugofs.Fs) SourceSpec {
-       return SourceSpec{Cfg: cfg, Fs: fs}
+       defaultLang := cfg.GetString("defaultContentLanguage")
+       languages := cfg.GetStringMap("languages")
+       return SourceSpec{Cfg: cfg, Fs: fs, languages: languages, defaultContentLanguage: defaultLang}
 }
 
 // File represents a source content file.
@@ -139,8 +144,8 @@ func (sp SourceSpec) NewFile(relpath string) *File {
        f.baseName = helpers.Filename(f.LogicalName())
 
        lang := strings.TrimPrefix(filepath.Ext(f.baseName), ".")
-       if _, ok := sp.Cfg.GetStringMap("languages")[lang]; lang == "" || !ok {
-               f.lang = sp.Cfg.GetString("defaultContentLanguage")
+       if _, ok := sp.languages[lang]; lang == "" || !ok {
+               f.lang = sp.defaultContentLanguage
                f.translationBaseName = f.baseName
        } else {
                f.lang = lang