Updated version of [ 558544 ] cmd.py: add instance-specific stdin/out

This patch adds stdin, stdout as optional arguments to the cmd.Cmd
constructor (defaulting to sys.stdin, sys.stdout), and changes the Cmd
methods throughout to use self.stdout.write() and self.stdin.foo for
output and input. This allows much greater flexibility for using cmd -
for instance, hooking it into a telnet server.

Patch for library module and for documentation.

1 files changed, 11 insertions, 5 deletions

diff --git a/Doc/lib/libcmd.tex b/Doc/lib/libcmd.tex
index 59d573f..4b2af91 100644
--- a/Doc/lib/libcmd.tex
+++ b/Doc/lib/libcmd.tex
@@ -11,17 +11,23 @@ line-oriented command interpreters.  These are often useful for
 test harnesses, administrative tools, and prototypes that will
 later be wrapped in a more sophisticated interface.
 
-\begin{classdesc}{Cmd}{\optional{completekey}}
+\begin{classdesc}{Cmd}{\optional{completekey},\optional{stdin},\optional{stdout}}
 A \class{Cmd} instance or subclass instance is a line-oriented
 interpreter framework.  There is no good reason to instantiate
 \class{Cmd} itself; rather, it's useful as a superclass of an
 interpreter class you define yourself in order to inherit
 \class{Cmd}'s methods and encapsulate action methods.
 
-The optional argument is the \refmodule{readline} name of a completion
-key; it defaults to \kbd{Tab}. If \var{completekey} is not \code{None}
-and \module{readline} is available, command completion is done
-automatically.
+The optional argument \var{completekey} is the \refmodule{readline} name
+of a completion key; it defaults to \kbd{Tab}. If \var{completekey} is
+not \code{None} and \module{readline} is available, command completion
+is done automatically.
+
+The optional arguments \var{stdin} and \var{stdout} specify the 
+input and output file objects that the Cmd instance or subclass 
+instance will use for input and output. If not specified, they
+will default to \var{sys.stdin} and \var{sys.stdout}.
+
 \end{classdesc}
 
 \subsection{Cmd Objects}