Check if the terminal supports UTF-8 before outputting unicode symbols

adapter/handlebars/handlebars.go

@@ -12,10 +12,10 @@ import (
 	"github.com/mickael-menu/zk/util/errors"
 )
 
-func Init(lang string, logger util.Logger, styler style.Styler) {
+func Init(lang string, supportsUTF8 bool, logger util.Logger, styler style.Styler) {
 	helpers.RegisterConcat()
 	helpers.RegisterDate(logger)
-	helpers.RegisterList()
+	helpers.RegisterList(supportsUTF8)
 	helpers.RegisterPrepend(logger)
 	helpers.RegisterShell(logger)
 	helpers.RegisterSlug(lang, logger)

adapter/handlebars/helpers/list.go

@@ -8,10 +8,15 @@ import (
 
 // RegisterList registers a {{list}} template helper which formats a slice of
 // strings into a bulleted list.
-func RegisterList() {
+func RegisterList(supportsUTF8 bool) {
 	itemify := func(text string) string {
+		bullet := "-"
+		if supportsUTF8 {
+			bullet = "‣"
+		}
+
 		lines := strings.SplitAfter(strings.TrimRight(text, "\n"), "\n")
-		return "  ‣ " + strings.Join(lines, "    ")
+		return "  " + bullet + " " + strings.Join(lines, "    ")
 	}
 
 	raymond.RegisterHelper("list", func(items []string) string {

adapter/term/term.go

@@ -2,6 +2,7 @@ package term
 
 import (
 	"os"
+	"strings"
 
 	"github.com/mattn/go-isatty"
 )
@@ -25,3 +26,10 @@ func (t *Terminal) IsInteractive() bool {
 func (t *Terminal) IsTTY() bool {
 	return isatty.IsTerminal(os.Stdin.Fd())
 }
+
+// SupportsUTF8 returns whether the computer is configured to support UTF-8.
+func (t *Terminal) SupportsUTF8() bool {
+	lang := strings.ToUpper(os.Getenv("LANG"))
+	lc := strings.ToUpper(os.Getenv("LC_ALL"))
+	return strings.Contains(lang, "UTF") || strings.Contains(lc, "UTF")
+}

cmd/container.go

@@ -51,7 +51,7 @@ func (c *Container) OpenZk() (*zk.Zk, error) {
 
 func (c *Container) TemplateLoader(lang string) *handlebars.Loader {
 	if c.templateLoader == nil {
-		handlebars.Init(lang, c.Logger, c.Terminal)
+		handlebars.Init(lang, c.Terminal.SupportsUTF8(), c.Logger, c.Terminal)
 		c.templateLoader = handlebars.NewLoader()
 	}
 	return c.templateLoader