* Look at stdout instead of stdin for determining whether output is going

to a tty or not.  Now you can do something like:

     ompi_info -all | grep btl_portals

  and get the full line for each btl_portals parameter.
* For the case where stdout is a tty, we have my current nomination for
  Today's Useless OMPI Feature.  Autodetect the width of the terminal, so
  people with really wide terminals will get less wrapping

This commit was SVN r6722.

ompi/tools/ompi_info/output.cc

@@ -22,6 +22,15 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+#ifndef TIOCGWINSZ
+#include <sys/ioctl.h>
+#endif
 
 #include "tools/ompi_info/ompi_info.h"
 
@@ -32,7 +41,7 @@ using namespace ompi_info;
 
 
 //
-// Private variables
+// Private variables - set some reasonable screen size defaults
 //
 
 static int centerpoint = 24;
@@ -48,12 +57,20 @@ void ompi_info::out(const string& pretty_message, const string &plain_message,
 #ifdef HAVE_ISATTY
   // If we have isatty(), if this is not a tty, then disable
   // wrapping for grep-friendly behavior
-
-  if (0 == isatty(0)) {
+  if (0 == isatty(STDOUT_FILENO)) {
       screen_width = INT_MAX;
   }
 #endif
 
+#ifdef TIOCGWINSZ
+  if (screen_width < INT_MAX) {
+      struct winsize size;
+      if (ioctl(STDOUT_FILENO, TIOCGWINSZ, (char*) &size) >= 0) {
+          screen_width = size.ws_col;
+      }
+  }
+#endif
+
   if (pretty) {
     string::size_type pos, max_value_width;
     string spaces;