updated hseval behavior

clyx-go/clyx.go

@@ -11,6 +11,8 @@ import (
   "math/rand"
   "net"
   "os"
+  "os/exec"
+  "runtime"
   "strconv"
   "strings"
   "unicode/utf8"
@@ -474,7 +476,31 @@ func NewClyx(libfname string, libCode string) *Clyx {
     }
     c.stack = append(c.stack, sb.String())
   }
-  c.words["hseval"] = func() { fmt.Fprintln(os.Stderr, "Error: unsupported word"); os.Exit(1) }
+  c.words["hseval"] = func() {
+    cmdStr := c.pop().(string)
+    var shell, flag string
+    if runtime.GOOS == "windows" {
+      shell = "cmd"
+      flag = "/c"
+    } else {
+      shell = "sh"
+      flag = "-c"
+    }
+    cmd := exec.Command(shell, flag, cmdStr)
+    cmd.Stdout = os.Stdout
+    cmd.Stderr = os.Stderr
+    cmd.Stdin = os.Stdin
+    err := cmd.Run()
+    var exitCode int64 = 0
+    if err != nil {
+      if exitError, ok := err.(*exec.ExitError); ok {
+        exitCode = int64(exitError.ExitCode())
+      } else {
+        exitCode = -1
+      }
+    }
+    c.stack = append(c.stack, exitCode)
+  }
   c.words["chr"] = func() { c.stack = append(c.stack, string(rune(toInt(c.pop())))) }
 
   regMath := func(name string, f func(float64) float64) {