Add simple tty check

oracle · May 3, 2022 · 2c83410 · 2c83410
1 parent 169251c
commit 2c83410
Showing 1 changed file with 3 additions and 5 deletions.
diff --git a/src/launcher/java/org/truffleruby/launcher/RubyLauncher.java b/src/launcher/java/org/truffleruby/launcher/RubyLauncher.java
@@ -181,10 +181,9 @@ protected boolean runLauncherAction() {
         // non-empty value, and the standard input and output are tty, `--help`
         // option shows the help message via the pager designated by the value.
 
-        // String value = System.getenv(name);
-        // if (value != null) {
-        //     value = value.strip();
-        //     if (value.length() != 0) {
+        if (System.console() == null) {
+            return super.runLauncherAction();
+        }
 
         String pager = System.getenv("RUBY_PAGER");
         if (pager == null) {
@@ -199,7 +198,6 @@ protected boolean runLauncherAction() {
             return super.runLauncherAction();
         }
 
-
         try {
             Process process = new ProcessBuilder(pager)
                     .redirectOutput(Redirect.INHERIT)