notebook

Python: changing the class of an instance

2008-12-08T12:53:00.003+11:00

So it happens often that i while i’m in ipython, i want to edit the display methods and test them without reloading the data.I tried pickling the data but pickle complained about it for somereason, so my only option was to edit the methods in place and whileipython is great, i prefer my editor, besides i want to store the codein case it, you know, works.So i type reload Module then foo.__class__ = Module.Foo and voila!all the methods change but the instance variables remain the same so idon’t have to reload the data!!

Source.

print the content of the clipboard as text (Windows)

2008-03-18T15:04:00.001+11:00

getclip.cpp

Ruby and VIM

2008-01-31T13:22:00.000+11:00

Article, documentation.

I had only one problem (on Windows). gVim comes with Ruby support, but the included console version of Vi doesn't. The solition is on hasno.info.

Windows Freeware Diff/Merge application

2007-04-23T11:07:00.001+10:00

I started a discussion about Diff/Merge tools on reddit.

I collected together the candidates on this list:

http://www.listible.com/list/windows-freeware-diff2Fmerge-application

The only one which was able to handle long lines is the CS-Diff. A few supports word wrapping, but none of them are flawless:

KDiff3 have the functionality, but breaks the lines randomly, useless.
WinMerge does the word wrapping good, but turning it on breaks keyboard navigation, and no word wrapping in the DiffPane.

Processing Tag files with Ruby

2007-04-18T11:49:00.000+10:00

#!/usr/bin/env ruby def proctag(tagline) # {tagname}<Tab>{tagfile}<Tab>{tagaddress}[;"<Tab>{tagfield}..] # "A tagfield has a name, a colon, and a value: "name:value". # The name of the "kind:" field can be omitted. A program reading the # tags file can recognize the "kind:" field by the missing ':'. ret = Array.new # tagname idxb = 0 idxe = tagline.index("\t") ret[0] = tagline[idxb..idxe-1] # tagfile idxb = idxe+1 idxe = tagline.index("\t",idxb) ret[1] = tagline[idxb..idxe-1] # tagaddress idxb = idxe+1 idxe = tagline.index(";\"",idxb) idxe = -1 if idxe == nil ret[2] = tagline[idxb..idxe-1] # tagfields ret[3] = nil ret[4] = nil if idxe != -1 fldlst = tagline[idxe+1..-1].strip.split("\t") for act in fldlst # handle kind if !act.include?(':') ret[3] = act else ret[4] = Hash.new if ret[4] == nil hm = act.split(':') ret[4][hm[0]]=hm[1] ret[3] = hm[1] if hm[0] == 'kind' end end end return ret end while gets next if $_[0] == ?! m = proctag($_.chomp) print m[3]," ",m[0],"\n" end

Mercurial - status produces wrong slashes on Windows

2007-03-02T15:39:00.001+11:00

If you don't like it, then a quick fix (for 0.9.3):

Line 768 in C:\Python24\Lib\site-packages\mercurial\util.py:

def localpath(path):

return path.replace('/', '\\')

Replace it with:

def localpath(path):

return path

Mercurial - kdiff3 - hgmerge

2007-03-01T17:31:00.001+11:00

Context: Windows, MSYS, Mercurial installed from source

Problem: hgmerge will use "merge" to merge even if kdiff3 is present

Solution: edit x:/Python24/Scripts/hgmerge and remove the following line (and the corresponding fi should be eliminated too):

if [ -n "$DISPLAY" ]; then

bzrvss

2007-02-19T12:06:00.001+11:00

I am using Mercurial since a month, so I abandoned my bzrvss project.

Mercurial + kdiff3 + qct + some custom python scripts are doing the job for me well enough.

SPE - python ide download link

2007-02-19T12:02:00.001+11:00

It's not so easy to find it, so here is the project page's link: http://developer.berlios.de/projects/python

bazaar merge plugin: extmerge

2007-01-16T14:28:00.001+11:00

http://erik.bagfors.nu/bzr-plugins/extmerge/index.html

Makes my life much easier, really cool.

bazaar, Mercurial, darcs

2007-01-15T12:25:00.001+11:00

Update 16/01:

bazaar: merge problem solved, see the next post.
Mercurial: found a way to query changes.

_____________________________________________

I played with Mercurial and darcs on the weekend. Environment: win32, python 2.5, console + sh from MSYS.

My observations:

darcs

Pros:

I really liked the interactive style of workflow.
It gave me enough informations about what I needed.
Merging was easy.
I's really cool.

Cons:

They were too creative during the command naming. Almost totally new command set is not a deal breaker, but uncool.
I's strange that the latest available windows binary is not the latest stable version. However It is possible to download the latest binary from an external site.
Hard to extend.

What makes it totally unusable for me: WindowsConsoles

During the evaluation I got several error messages complaining about my console being out of sync.
I will try to overcome on this somehow. Maybe disabling the interactive features makes it possible to use it, or just use the cmd.exe.

Mercurial

It is similar to bazaar.

Pros:

More fine grained control than in bazaar (pull/update/merge are separate steps).
Merge is more easy than in bazaar (easy to configure external diffs).
Written in python, easy to extend.

Cons:

Installation from the sources is working well, but the windows binary installer is trying to install the msvcrt71.dll into the windows/system32. This is totally unacceptable.

What makes it totally unusable for me: ~~I weren't able to query file status changes between two branches.~~ If I would like to see what changes I have made, I have to query the changes from the upstream's repository and specify my working branch in a parameter. It's logical but not practical.

bazaar

Pros:

Written in python, easy to extend.
Provides every information what I need. Easy to query changes between branches.
Easy to install, working well with my my console.

Cons:

~~Merging is not too user friendly. On conflict it just put the 3 versions to the filesystem, and you have to do the merging manually. (darcs and mercurial provides nice way to define a merge tool)~~

bzr-gtk

2006-12-21T14:37:00.001+11:00

I tried out the bzr-gtk gui for Bazaar, but it took too long time to get it working, and it doesn't do too much. I am thinking on a wxPython based gui for it. I think it would be much more widely usable than a pygtk app.

It actually have nice features, but I would prefer to have a wxPython version. It could work on OSX too, and it is much easier to install.

I used WinCvs for a long time and then SmartCVS. They are really good programs and made my life a lot easier.

What I miss from bzr-gtk:

file level informations (I just would like to see the history of a file.)
the file listing window doesn't have a column header, it is not possible to order by status
flat view: view all files recursively in a directory
visual diff (or to be able to use an external one)
I really like the visualization but no it would be nice to show the changed file list too

Bazzar in practice, WinMerge patch, bzr-gtk

2006-12-20T16:30:00.001+11:00

I am now using Bazaar to store my working copy. I didn't have the opportunity to try out the syncing (no commits for today).

In the same time I made a little modification on my favorite merge application (WinMerge) and I used Bazaar to create the patch. It was a good mini learning project. I had only one problem. The diff on the console looked good, but when I redirected the output to a file there were extra line breaks in it. I don't know why this happens, I weren't able to avoid it, but I had to remove them with tr.

I made a mistake. I created a branch and then moved the directory. It worked well till I tried to do a pull. I got a nice exception. The exception came from a filename converting function, and the filename was empty. I moved on because the merge operation worked, and didn't have time to bother with it, but today I checked the .brv directory for any kind of easy solution, and it was there. There is a file called parent which contained something like this: ../../../. I moved the directory one level up, so I just had to remove a ../ and everything became fine.

I tried out the bzr-gtk gui for Bazaar, but it took too long time to get it working, and it doesn't do too much. I am thinking on a wxPython based gui for it. I think it would be much more widely usable than a pygtk app.

VSS -> Bazaar

2006-12-08T16:31:00.001+11:00

I hate MS Visual SourceSafe, but must use it, so it is time to do something.

The idea: use bazaar as a proxy between me and VSS.

Goals:

keep my working source up2date without too much effort
use branches to separate independent tasks and to be able to track them
I don't want to commit into VSS through bazaar, I will merge changes manually back, but I need help to check-out the required files

Workflow:

import project from VSS into Bazaar
check-out, create branch, work on it, commit, add new files, remove files ...
if it is needed update from VSS [vss get latest version, commit changes into bazaar]
merge back manually to VSS [need a good report about the changes, vss check-out, manual merge, compile, commit, update bazaar main branch]

The corresponding doc from the bazaar homepage: http://bazaar-vcs.org/TrackingUpstream

Initial post

2006-11-08T16:36:00.000+11:00

I decided to start an english development blog, mainly because I would like to practice the language.

My interests: c, c++, python, php, html, js, win, linux