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Using Git as a versioned data store in Python
Git has sometimes been described as a versioning file-system which happens to support the underlying notions of version control. And while most people do simply use Git as a version control system, it remains true that it can be used for other tasks as well.
For example, if you ever need to store mutating data in a series of snapshots, Git may be just what you need. It’s fast, efficient, and offers a large array of command-line tools for examining and mutating the resulting data store.
To support this kind of usage — for the upcoming purpose of
maintaining issue tracking data in a Git repository — I’ve created
a Python class that wraps Git as a basic shelve
object.
Diving into Git
This week I decided to convert my Ledger repository over to Git. Previously I’d been using Subversion for about 4 years, and CVS for 1 year before that. There was a brief flirt with Darcs, and Mercurial, but neither ever attracted me enough to convert the repository officially.
Why did I choose Git? Actually, I’d looked at Git before, maybe a year ago, and decided it was too complex and funky. But some recent articles — and new versions of Git — prompted me to look again. Yes, it still looks complex, but then again, UNIX is complex and I’ve never stopped loving that since I made my first terminal connection. In fact, when you look at Git in terms of the UNIX philosophy, rather than as a single application, it starts making a whole lot more sense. (It was written by a UNIX-ish kernel developer, after all).
Migrating my official repository represented a special challenge, because I decided I wanted my entire history, not just the Subversion parts of it. I mean, I wanted to pull the CVS repo out of the archives and thread it along with the Subversion repo into a nice, coherent history going all the way back to version 0.1.
With other tools — even Mercurial — I would have shied away from such an undertaking. But Git not only made it possible, it was even straightforward and rather fun to do. This article chronicles my adventures at manually pasting together a version control history, and how powerfully Git was able to handle this task — which would have been patently impossible using CVS or Subversion.
Read More...FP techniques in Lisp: Data sharing
Recently I've been porting a C++ accounting system to Common Lisp. And after only six weeks, the port is nearly complete — a feat I credit to the power of the Lisp language and the facilities it offers I'd been forced to replicate in C++.
But as the port nears completion, I find myself questioning some of the design decisions. Did C++ force me down a path where Lisp can offer a better alternative? Read More...