token accounting cleanup

term_windows.go

@@ -2,9 +2,27 @@
 
 package main
 
-import "errors"
+import (
+  "errors"
+  "os"
+  "os/exec"
+  "strconv"
+  "strings"
+)
 
-func termWidth() int { return 80 }
+func termWidth() int {
+  if w := os.Getenv("COLUMNS"); w != "" {
+    if n, err := strconv.Atoi(strings.TrimSpace(w)); err == nil && n > 0 {
+      return n
+    }
+  }
+  if out, err := exec.Command("tput", "cols").Output(); err == nil {
+    if n, err := strconv.Atoi(strings.TrimSpace(string(out))); err == nil && n > 0 {
+      return n
+    }
+  }
+  return 80
+}
 
 func isTerminal(fd int) bool { return false }