On Understanding Data Abstraction, Revisited

I’m not in the habit of posting links, but this essay by Willam R. Cook on the difference between ADTs and objects made such an excellent and humbling read... Humbling because in my arrogance I had assumed that I knew the difference – after all this is basic stuff. Excellent because despite the humbling experience, it’s a very enjoyable read.

Enjoy.

Technorati: ADT,objects,data abstraction

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How to get hg-git working with Mercurial without installing Python on Windows

Sorry for the horrendous search keyword-driven title, but I’ve been trying to get this to work for ages.

Here’s a step by step guide, along with some potential pitfalls.

1) Download TortoiseHg. I used 0.9.1.1. with Mercurial 1.4.1. Do not use the windows Mercurial command line only distribution – we’ll need to modify a zip file later and for some reason the zip file with the command line distribution cannot be modified with either WinRar, Winzip or 7-zip.

2) Install TortoiseHg as usual.

3) Download dulwich 0.4.0.

4) Add the directory called ‘dulwich’ inside the dulwich download (the one with the file __init__.py in it) to the library.zip file in the TortoiseHg folder (normally just C: \Program Files\TortoiseHg) using your favorite zip utility.

5) Download the tip of an up to date hg-git fork. I used http://bitbucket.org/gwik/hg-git/.

6) Put the hg-git directory in the TortoiseHg directory.

7) Add the following lines to your Mercurial.ini file:

bookmarks =

hggit = C:\Program Files\TortoiseHg\hg-git\hggit

That’s it. I finally managed to clone the ClojureClr repository with the above install:

> hg clone git://github.com/richhickey/clojure-clr.git
destination directory: clojure-clr.git
importing Hg objects into Git
Counting objects: 4001, done.
Compressing objects: 100% (1816/1816), done.
Total 4001 (delta 3153), reused 2774 (delta 2148)
importing Git objects into Hg
at:   0/307
at: 100/307
at: 200/307
at: 300/307
updating to branch default
313 files updated, 0 files merged, 0 files removed, 0 files unresolved

And with this we’re back to functional programming languages ;)

I didn’t test this any further.

Good luck!

Technorati: mercurial, hg, hg-git, git

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