# HG changeset patch
# User jlahoda
# Date 1476181995 -7200
# Node ID 7fc722354621d85c2f4b55c73ac71e15b212b348
# Parent  e5ebda6a1a832f6a21d2dab2fe3d2dc358f591d4
8166890: JShell: locks forever when input is piped
Summary: Only read cursor position if connected to a terminal.
Reviewed-by: rfield, shinyafox

diff -r e5ebda6a1a83 -r 7fc722354621 jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java
--- a/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java	Tue Oct 11 12:25:54 2016 +0200
+++ b/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java	Tue Oct 11 12:33:15 2016 +0200
@@ -2339,7 +2339,7 @@
 
             Stack<Character> pushBackChar = new Stack<Character>();
 
-            if (terminal.isAnsiSupported()) {
+            if (terminal.isAnsiSupported() && System.console() != null) {
                 //detect the prompt length by reading the cursor position from the terminal
                 //the real prompt length could differ from the simple prompt length due to
                 //use of escape sequences: