Make the "python" command resemble the standard Python interpreter

[Khoo Yit Phang]

Hi,

I'd like to contribute a patch to improve the "python" command by making it resemble the standard Python interpreter in behavior.

For "python" with arguments, this prints the results of expressions, e.g., "python 1 + 2" will print "3" (previously, it will not print anything).

For "python" without arguments, this uses Python's built-in interactive loop (PyRun_InteractiveLoop) so that individual statements/expressions are immediately evaluated and results of expressions are printed. It also hooks GDB's readline wrappers (command_line_input) to Python so that line editing and history editing works. Additionally, Python's standard readline module is stubbed out because it conflicts with GDB's use of readline.

This patch depends on a patch to handle SIGINT that I previously submitted (http://sourceware.org/bugzilla/show_bug.cgi?id=13265) to handle SIGINT in the interactive loop.

Thanks!

Yit
January 10, 2012

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