Use $SHELL -c for the {{sh}} template helper

adapter/handlebars/handlebars_test.go

@@ -158,6 +158,9 @@ func TestShellHelper(t *testing.T) {
 		nil,
 		"Hello, world!",
 	)
+
+	// using pipes
+	testString(t, `{{sh "echo hello | tr '[:lower:]' '[:upper:]'"}}`, nil, "HELLO")
 }
 
 func TestStyleHelper(t *testing.T) {

adapter/handlebars/helpers/shell.go

@@ -1,12 +1,11 @@
 package helpers
 
 import (
-	"os/exec"
 	"strings"
 
 	"github.com/aymerick/raymond"
-	"github.com/kballard/go-shellquote"
 	"github.com/mickael-menu/zk/util"
+	"github.com/mickael-menu/zk/util/exec"
 )
 
 // RegisterShell registers the {{sh}} template helper, which runs shell commands.
@@ -15,17 +14,8 @@ import (
 // {{sh "echo 'Hello, world!'"}} -> Hello, world!
 func RegisterShell(logger util.Logger) {
 	raymond.RegisterHelper("sh", func(arg string, options *raymond.Options) string {
-		args, err := shellquote.Split(arg)
-		if err != nil {
-			logger.Printf("{{sh}} failed to parse command: %v: %v", arg, err)
-			return ""
-		}
-		if len(args) == 0 {
-			logger.Printf("{{sh}} expects a valid shell command, received: %v", arg)
-			return ""
-		}
+		cmd := exec.CommandFromString(arg)
 
-		cmd := exec.Command(args[0], args[1:]...)
 		// Feed any block content as piped input
 		cmd.Stdin = strings.NewReader(options.Fn())