X(), for low level debugging
X() is my function for low level ad hoc debug messages.
It takes a message and optional format arguments for use with %.
It is presented here in its own module for reuse.
It normally writes directly to sys.stderr but accepts an optional
keyword argument file to specify a different filelike object.
If file is not specified, its behaviour is further tweaked with
the globals X_discard, X_logger and X_via_tty:
if X_logger then log a warning to that logger;
otherwise if X_via_tty then open /dev/tty and write the message to it;
otherwise if X_discard then discard the message;
otherwise write the message to sys.stderr.
X_discard's default value is not sys.stderr.isatty().
Function X(msg, *args, **kw)
Unconditionally write the message msg.
If there are positional arguments after msg,
format msg using %-expansion with those arguments.
Keyword arguments:
file: optional keyword argument specifying the output file.colour: optional text colour. If specified, surround the message with ANSI escape sequences to render the text in that colour.
If file is not None, write to it unconditionally;
otherwise if X_logger then log a warning to that logger;
otherwise if X_via_tty then open /dev/tty and write the message to it;
otherwise if X_discard then discard the message;
otherwise write the message to sys.stderr.
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Release files for cs.x 20181231
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