Revert "Modifiable lang from env (#8)"

This reverts commit 8f68a8e.

README.md

@@ -59,29 +59,6 @@ You can download executable binaries from the release page.
 
 > [Latest Release](https://github.com/sheepla/fzwiki/releases/latest)
 
-## Configuration
-
-You can change the default language by setting a value in the environment variable `FZWIKI_LANG` .
-
-```bash
-FZWIKI_LANG="ja" fzwiki ... # --> search from ja.wikipedia.org instead of en.wikipedia.org
-```
-
-If you want to make the setting persistent,
-add the following line to your rc file of the shell.
-
-- **bash** (`~/.bashrc`) or **zsh** (~/.zshrc):
-
-```bash
-export FZWIKI_LANG="ja"
-```
-
-- **fish** (`~/.config/fish/config.fish`):
-
-```fish
-set -Ux FZWIKI_LANG ja
-```
-
 ## LICENSE
 
 [MIT](./LICENSE)

main.go

@@ -18,9 +18,8 @@ import (
 )
 
 const (
-	appVersion  = "0.0.4"
-	appName     = "fzwiki"
-	envNameLang = "FZWIKI_LANG"
+	appVersion = "0.0.4"
+	appName    = "fzwiki"
 )
 
 type options struct {
@@ -70,15 +69,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	var lang string
-	if opts.Language == "" {
-		lang = os.Getenv(envNameLang)
-	} else {
-		lang = opts.Language
-	}
-
-	result := searchArticles(strings.Join(args, " "), lang)
-
+	result := searchArticles(strings.Join(args, " "), opts.Language)
 	for i := 0; i < len(result.Query.Search); i++ {
 		if t, err := html2text(result.Query.Search[i].Title); err == nil {
 			result.Query.Search[i].Title = t
@@ -111,7 +102,7 @@ func main() {
 	}
 
 	for _, idx := range choices {
-		url := createPageURL(result.Query.Search[idx].Title, lang)
+		url := createPageURL(result.Query.Search[idx].Title, opts.Language)
 		if opts.Open {
 			if err := webbrowser.Open(url); err != nil {
 				log.Fatal(err)