feat: add -s (silent) support for read builtin

interp/builtin.go

@@ -14,7 +14,9 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"syscall"
 
+	"golang.org/x/term"
 	"mvdan.cc/sh/v3/expand"
 	"mvdan.cc/sh/v3/syntax"
 )
@@ -560,9 +562,12 @@ func (r *Runner) builtinCode(ctx context.Context, pos syntax.Pos, name string, a
 	case "read":
 		var prompt string
 		raw := false
+		silent := false
 		fp := flagParser{remaining: args}
 		for fp.more() {
 			switch flag := fp.flag(); flag {
+			case "-s":
+				silent = true
 			case "-r":
 				raw = true
 			case "-p":
@@ -589,7 +594,14 @@ func (r *Runner) builtinCode(ctx context.Context, pos syntax.Pos, name string, a
 			r.out(prompt)
 		}
 
-		line, err := r.readLine(raw)
+		var line []byte
+		var err error
+		if silent {
+			line, err = term.ReadPassword(int(syscall.Stdin))
+		} else {
+			line, err = r.readLine(raw)
+		}
+
 		if err != nil {
 			return 1
 		}