HBASE-2710. Shell should have default terminal width when detection fails

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@953529 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -381,6 +381,8 @@ Release 0.21.0 - Unreleased
    HBASE-2684  TestMasterWrongRS flaky in trunk
    HBASE-2691  LeaseStillHeldException totally ignored by RS, wrongly named
    HBASE-2703  ui not working in distributed context
+   HBASE-2710  Shell should use default terminal width when autodetection fails
+               (Kannan Muthukkaruppan via Todd Lipcon)
 
   IMPROVEMENTS
    HBASE-1760  Cleanup TODOs in HTable

src/main/ruby/shell/formatter.rb

@@ -31,6 +31,12 @@ module Shell
 
       def refresh_width()
         @max_width = Java::jline.Terminal.getTerminal().getTerminalWidth()
+
+        # the above doesn't work in some terminals
+        # (such as shell running within emacs)
+        if @max_width == 0
+          @max_width = 100
+        end
       end
 
       # Takes an output stream and a print width.