add getLang() to parse language

comitium.go

@@ -13,11 +13,17 @@ import (
 	"path/filepath"
 
 	"github.com/mitchellh/go-homedir"
+	"golang.nytpu.com/comitium/localizations"
+	"golang.org/x/text/language"
 
 	"golang.nytpu.com/comitium/core"
 	"golang.nytpu.com/comitium/fetch"
 )
 
+var supportedLangs = []language.Tag{
+	language.AmericanEnglish, // en-US (fallback)
+}
+
 func main() {
 	argCheck(os.Args, 2, true, "Please provide a command.")
 
@@ -41,6 +47,9 @@ func main() {
 	c.AddFlagSet(globalFs)
 	c.Parse(os.Args[2:])
 
+	// figure out what language to use
+	localizer := getLang()
+
 	// dataPath is the location where all the data (list of subs, cached hashes,
 	// etcetera) are stored
 	dataPath := getDataPath()
@@ -152,6 +161,18 @@ func getDataPath() string {
 	return verifyPath("comitium")
 }
 
+// getLang will return the localizer for the user's lang
+func getLang() *localizations.Localizer {
+	matcher := language.NewMatcher(supportedLangs)
+	var lang language.Tag
+	if *langFlag != "" {
+		lang, _ = language.MatchStrings(matcher, *langFlag)
+	} else if env := os.Getenv("LANG"); env != "" {
+		lang, _ = language.MatchStrings(matcher, env)
+	}
+	return localizations.New(lang.String(), supportedLangs[0].String())
+}
+
 func usage() {
 	fmt.Fprintf(os.Stderr, "Usage:\n")
 	fmt.Fprintf(os.Stderr, "  %v <command> [FLAGS] [ARGUMENTS]\n\n", os.Args[0])