GM display and animate pipe default

The proper way to specify input from a pipe in GraphicsMagick is via 
the '-' symbol.  This allows input from a pipe like:

  cat crap.miff | gm display -

It turns out that GraphicsMagick has been using a function called 
isatty() on stdin to determine if the input is from a tty (and 
therefore not a pipe).  This test is only applied when there is no 
input file parameter specified.  It used to be reasonable to use 
isatty() but it seems that Gnome's application launcher does not pass 
this test.  If the isatty() test failed, then '-' is automatically 
passed as the default parameter.

I plan to remove this default in GraphicsMagick 1.2 so that if no file 
name is provided then the GUI will still successfully display its 
default window.  Some existing scripts may require a trivial update. 
Should I do the same for GraphicsMagick 1.1.X?

Bob
======================================
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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