Go: Write RPC-Connected Plugins

Plugins are Go’s system for developing shared-libraries. However, this is backed by a general system that can also have alternative implementations. In this case, you can write a plugin in Go that runs from one system and load that plugin in Go, on the fly, from a million other systems. Courtesy of Hashicorp.

https://github.com/hashicorp/go-plugin

 

 

Python: Command-Line Completion for argparse

argcomplete provides very useful functionality that you will basically get for free with just a couple of steps.

Implementation

Put some markup below the shebang of your frontend script in the form of a comment:

#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK

The BASH-completion script argcomplete will basically identify and scan any script with a Python shebang that is used with BASH-completion. This entails actually running the script. In order to minimize how much time is spent loading scripts that don’t actually use argcomplete, the completion script will ignore anything that does not have this comment directly following the shebang.

Next, add and import for the argcomplete package and run argcomplete.autocomplete(parser) after you have configured your command-line parameters but before your call to parser.parse_args() (where parser is an instance of argparse.ArgumentParser). This function will produce command-line configuration metadata and then terminate.

That is it. Note that it is not practical to assume that everyone who uses your script will have argcomplete installed. They may not be using BASH (BASH is the only well-supported shell at this time), they may not be using a supported OS, and/or any commercial environments that adopt your tools may be server environments that have no use for command-line completion and refuse to support it. Therefore, you should wrap the import with a try-except for ImportError and then only call argcomplete.autocomplete if you were able to import the package.

Installation

To install autocomplete, the simplest route is to merely do a “sudo pip install argcomplete” and then call “activate-global-python-argcomplete” (this is a physical script likely installed to /usr/local/bin. This only has to be done once and will install a non-project-specific script that will work for any script that is equipped to use argcomplete. For other configuration and semantics, see the project page.

Discussion of Trying to Make GCC Work With LLVM in the Pre-Clang Days

From back in 2005:

On the positive side, LLVM has a lot more experience in managing whole program compilation, and it is a much cleaner software base. It would be a good to find some mechanism to take advantage of that experience. Trying to make the hippo dance is not really a lot of fun.

Re: LLVM/GCC Integration Proposal