Archive for the ‘Code’ Category

Git extract folder from project with history and tags

Wednesday, November 2nd, 2016 by Jesper Rønn-Jensen

`git filter-branch` will extract a folder from a shared repository and rewrite history. This tip shows you by example. And also how to rewrite tags in the new repos.

Ruby make list minimum length

Sunday, December 13th, 2015 by Jesper Rønn-Jensen

In a Ruby on Rails app, I wanted a list to be at least of two items. This could be done in several ways. Here is a first naïve impementation: # Naïve implementation, just return whatever number I need def sum_up_a(existing) return 2 if existing == 0 return 1 if existing == 1 return 0 end […]

Change history of SVN repository

Wednesday, April 15th, 2015 by Jesper Rønn-Jensen

Somebody asked me if it’s possible to change history of an SVN repository like you can do in Git. The easiest parts to change are: commit date commit log message With this, you can easily modify time stamps if, for instance, your svn server clock is wrong. Step 1: Modify repository to accept property changes […]

Easter egg CSS circles

Sunday, March 29th, 2015 by Jesper Rønn-Jensen

Easter eggs instead of circles on your CSS. It’s easier than I thought.


Git checkout old revisions by date

Friday, November 9th, 2012 by Jesper Rønn-Jensen

I wanted to do some code stats for a repository. This line checks out old revisions by date and shows code stats: git checkout `git rev-list -n 1 –before=”2012-03-01″ master` Then, I ran cloc to count lines of code: cloc . Its really easy to register the point in time as a git branch so […]

PhantomJS 1.7 build for Linux 64 bit

Friday, September 28th, 2012 by Jesper Rønn-Jensen

At a project I work on, we needed PhantomJS to run from a Redhat Fedora 64 bit machine. Since phantomJs is just released this week, I needed to build it myself.   I post this link to the binary in case it can benefit others.   PhantomJs 1.7.0 built on Linux Redhat Fedora 64 bit […]

Forgotten Subversion Commands, Undo, Merge Branches and More

Thursday, June 28th, 2012 by Jesper Rønn-Jensen

In a current project I use a lot of Subversion (svn) from the command-line. Subversion recently has lost terrain to Git for several reasons. But actually, svn is capable of doing many of the things I love from Git. Here are some less known commands I find extremely helpful.   Undo last commit svn merge […]

GWT Developer Plugin now Works with Firefox 9

Saturday, January 28th, 2012 by Jesper Rønn-Jensen

(UPDATED) The GWT developer plugin has been updated to works with Firefox 9, a couple of days ago. Its not yet officially available, but can be downloaded directly from the codebase: prebuilt folder in here  is the gwt-dev-plugin.xpi, and it works like a charm :) Previously i wrote when the plugin was updated to […]

Batch Screenshots with webkit2png

Monday, January 23rd, 2012 by Jesper Rønn-Jensen

For projects I sometimes have lots of screenshots which I have to repeat whenever I change subtle things in the CSS or HTML. I ended up creating this little handy script based on webkit2png (download source) #!/usr/bin/env sh HOST=”http://localhost:8080/myproject/viewer” /usr/bin/python webkit2png -F -o “01dashboard” $HOST/dashboard /usr/bin/python webkit2png -F -o “02showdetail” $HOST/detail /usr/bin/python webkit2png -F -o […]

Maven mirrorOf * in settings.xml breaks the build

Friday, January 20th, 2012 by Jesper Rønn-Jensen

Using maven behind a firewall in environments with an internal repository can be troublesome, and even break the build. Here is an option to set up Maven

IntelliJ Structural Search to Convert from JUnit3 to Junit4

Wednesday, January 18th, 2012 by Jesper Rønn-Jensen

Just a quick tip for intellij users. For an old project i wanted to convert JUnit 3 testcases to JUnit4 format. Most stuff was already in place, but after the conversion, i found that some of the old “assertTrue”, “assertFalse”, and “assertEquals” statements were failing. So i ended up with some short search/replace, which are really […]

GWT Developer plugin for Firefox 7 is now Ready

Monday, October 10th, 2011 by Jesper Rønn-Jensen

UPDATED 2011-12-14: Prebuilt folder now contains Firefox 8 version of the GWT developer plugin. Since Firefox 7 was released, i have defered upgrading for one simple reason: At work I am dependent on GWT Developer plugin. Today I found the ready-to-release plugin which actually works with Firefox 7: in here  is the gwt-dev-plugin.xpi, and […]

Collection of useful Git Tips to get started

Friday, September 30th, 2011 by Jesper Rønn-Jensen

I thought it was time to collect some of my most useful findings when working with Git. These are typically from situations where I found a useful way, which I wanted to jot down. Also I have answered and asked some questions on StackOverflow. The good thing about it, is that I am always able […]

Java Friday Fun: @WTF annotations in code

Friday, September 16th, 2011 by Jesper Rønn-Jensen

Time for a little geeky gimmick. Some developers see and express a lot of “WTF??” while trying to understand code IN this spirit, i created a quick @WTF annotation for Java. Besides being completely useless (its removed at compile time), its only purpose is to give developers a new way to express themselves in code. […]

Windows delete all tmp files command

Tuesday, July 12th, 2011 by Jesper Rønn-Jensen

Just a quick note to self about this tip i found. It is a Windows (XP) helpful command line snippet that removes all your temporary files. Delete all files in temp folder: DEL /F /S /Q %TEMP% Taken from the “A-Z Index of the Windows CMD command line”

Windows SVN pre-commit-hook

Thursday, June 10th, 2010 by Jesper Rønn-Jensen

At a current project I work on, we use a Windows server to run our subversion repository. I wanted to set up the pre-commit hook so that commits with empty comment are automatically rejected. All commit-hook example files that go with Subversion are written in bash (as unix servers tend to be the normal). Here […]

Seeding Rails App With RESTful Address Data

Wednesday, April 28th, 2010 by Jesper Rønn-Jensen

Grabbing data from Restful webservices has never been easier. I use this code in the Rails /db/seeds.rb file to grab data from the Danish webservice with addresses, municipalities, regions, etc. I decided to import the data into a local database to ensure it could work offline. Code from /db/seeds.rb file: Now I can access municipalities […]

Groovy for Hudson console

Tuesday, April 20th, 2010 by Jesper Rønn-Jensen

Hudson continuous integration server has a console which is good for testing scripts and access to commands that your Hudson jobs need. The hudson console only let’s you run Groovy script. To run commands on the machine, Groovy has the method “string”.execute() . So now I can use this snippet to test versions of Ruby, […]

How To Recover Deleted Subversion Branch

Wednesday, December 9th, 2009 by Jesper Rønn-Jensen

I recently deleted a branch from our (svn) code repository. Did you know that it’s the general recommendation to delete a branch after a merge to ensure that nobody commits to it. (see svnmerge wiki for more on that advice) Svn checkout, svn info, etc. all fail when you try to access the deleted branch […]

How to make Git ignore files that already exist in your project

Monday, December 7th, 2009 by Jesper Rønn-Jensen

For a project I’m working on, I had to change some files with personal settings, and the files kept showing up with a git status . Adding files to .gitignore that are already tracked does not work. (and it’s actually pretty well documented in the documentation). In stead, it’s possible to use this command: git […]

Run Tiny Webserver From Any Directory

Tuesday, December 1st, 2009 by Jesper Rønn-Jensen

There are alternatives to Resolve Symlinks When Copying Files With Rsync . How about firing up a (tiny) webserver that starts up quickly. Yehuda Katz suggested this some years ago: Just drop this file in any directory, run the script, and it serves the files. I use this frequently for instance when I need to […]

How to Remove Trailing Space from source files

Thursday, November 26th, 2009 by Jesper Rønn-Jensen

When it comes to source code, i am a perfectionist. I cant stand to see trailing whitespace, interchanged tabs/spaces, etc. This Stackoverflow user asked How To Remove Trailing Whitespace Of All Files Recursively. This reply helped me to work around the fact that \s and \t are not supported in the mac version of sed: […]

Script identifying CSS shorthand possibilities

Wednesday, October 21st, 2009 by Jesper Rønn-Jensen

For my own convenience I created this script to identify css files where colors like #aaaaaa can be rewritten in the short form #aaa (saves bandwith, but can also make it easier to identify similar colors) grep -nE ‘#([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3’ **/*.css output from a random project: css/actions.css:19: color: #000000; css/actions.css:38: color: #000000 !important; css/actions.css:53: color: #ffffff […]

Resolve Symlinks When Copying Files With Rsync

Thursday, October 15th, 2009 by Jesper Rønn-Jensen

In a project I’m working on there is a structure where images and css are common for some of the subprojects. One folder has static pages for testing HTML + CSS layout. This folder has some symlinks to the /css folder and /images folder. Now, on my Mac during normal development, this works perfectly. But […]

Extract HTML Structure From Page With Simple Script

Monday, October 5th, 2009 by Jesper Rønn-Jensen

I often want to extract parts of HTML page. Often I find myself parsing a doc with Nokogiri and extracting it with a CSS selector. It’s pretty straight-forward from scratch. To follow the Don’t Repeat Yourself principle, I created a script to make it a one-liner. Just run ruby parsepage.rb [url] [css_selector] Feel free to […]

Spoken Git Commit Log — Another Annoyance at the Office

Wednesday, September 30th, 2009 by Jesper Rønn-Jensen

Here is a short one-liner that really annoyed my colleagues today. I set my mac to read aloud all changes in the repository since yesterday: git log –pretty=format:”%an commit %s, %ad.” –date=relative –since=yesterday |say if you remove the “say” command in the end it’s actually pretty readable: pagerbak commit VA17, 34 minutes ago. pagerbak commit […]

Print CSS Background Logo Hack

Tuesday, September 29th, 2009 by Jesper Rønn-Jensen

I learned this nice little hack to bypass the standard browser setting that normally prevents background images from being printed. The hack makes use of converting the background-image to a list item with an image. /* Hack, to trick the browser to print another logo Unfortunetaly, Firefox on Windows doesn’t show logo on print — […]

Selection Groups in Rails made less cumbersome

Tuesday, September 1st, 2009 by Jesper Rønn-Jensen

I made this addition today after (once again) struggling with option groups for a nested Rails model. My solution: create a new tag for FormOptionsHelper: grouped_select

How to add Git Pull Shortcut to Different Github Branches

Sunday, August 23rd, 2009 by Jesper Rønn-Jensen

UPDATE 9 hours later: Changed to “remote = origin” to the specific branch “remote = dean” which works! Short explanation on how to pull changes from different Git repositories into your local Git repository. Last week I worked with three different Github forks of a project. Now for standard, when you clone a Github repository, […]

Importing Existing Git repository into SVN

Wednesday, July 8th, 2009 by Jesper Rønn-Jensen

Many of my colleagues know svn but are in general not (yet) ready jump over to using Git for bigger projects. Today I had to import my existing Git repository into SVN. I had been working locally with a Git repos and wanted to keep my history before giving access to my colleagues. The guide […]

Using Git for SVN Repositories Workflow

Monday, March 9th, 2009 by Jesper Rønn-Jensen

For the last months I have been using Git to work with my Subversion repositories. Besides from reducing disk usage, Git also makes my work slightly faster and independent of network access — I can make commits to repository which is sync’ed later when I get online. One challenge though: Using branches I ran into […]

Using Local File-based Git — Server Laziness

Saturday, February 21st, 2009 by Jesper Rønn-Jensen

My problem this week: I wanted to share some work with a colleague. Unfortunately we have not yet setup our caplab environment with git server. Nor did i want to push this particular project to GitHub or Unfuddle. My alternative was a file-based setup: Each developer’s machine has it’s own Git repository. On my machine […]

Git Side Benefit: Reducing Disk Usage

Saturday, January 17th, 2009 by Jesper Rønn-Jensen

A side benefit of switching from Subversion to Git for source control is that Git does not use shadow files and directories to find out what has changed. I created two checkouts of a svn project — one using traditional svn and one using git (which can actually clone a svn repos — see explanation […]

Plugin for Rails’s Resource Controller

Friday, November 7th, 2008 by Jesper Rønn-Jensen

If you’re using Resource Controller for Ruby on Rails, you may want to look atthe plugin I just created. From the readme file: ResouceControllerRespondTo ========================== Extends ResourceController plugin for Rails to make it respond_to .xml and .json formats Based on code by Florent Piteau and Joe Fiorini… Jesper merely provided the glue and packed as […]

Adding Deprecation Warning in JavaScript Console

Thursday, July 17th, 2008 by Jesper Rønn-Jensen

I used this quick trick today to help me clean up and refactor some javascript functions today: if (“console” in window) console.warn(‘DEPRECATED function call to ‘+ arguments.callee +’\nCalled by:\n’+ arguments.callee.caller ); Which results in a fine deprecation warning in the console: There is plenty of space for improvement here. Feel free to use or tamper […]

Don’t Repeat Yourself (Unless Reading Book)

Monday, June 23rd, 2008 by Jesper Rønn-Jensen

After reading Pragmatic Programmer at my recent vacation, I immediately found an urge to repeat myself and read it again.

Ironic that one of the most popular tips from it is “Don’t repeat yourself”.

Public Danish Data REST Interface

Wednesday, May 28th, 2008 by Jesper Rønn-Jensen

Christian Dalager and I did an internal Capgemini SmartLunch presentation about REST interfaces in the public Danish sector. REST interface is great news for those in favor of easy-to-integrate, scalable SOA interfaces, and REST services is actually used more than SOAP, XMLRPC, etc. in companies offering multiple interfaces to their data (Amazon, Yahoo, Google, Ebay, […]

Converting UTF-8 Data to Outlook Compatible Charset

Wednesday, November 21st, 2007 by Jesper Rønn-Jensen

A problem in a current Rails app just found a decent solution, as Danish letters like æøå did not show up decently. It turned out (surprise) that Outlook had a problem accepting UTF-8 charset. On the Meeting model in the Rails app I want to save to calendar in an Outlook compatible format. We solved […]

How to Run JavaScript From Watir Scripts

Tuesday, November 20th, 2007 by Jesper Rønn-Jensen

What’s Watir? Read “Watir: Another sweetspot for Enterprise Ruby” Is it possible to run JavaScript functions or execute code from within your Watir test scripts? As a matter of fact it is, but I had a hard time finding the proper documentation for it. Here is what to do and how: Call JavaScript Functions from […]

Powerful Text Editor Released

Wednesday, August 8th, 2007 by Jesper Rønn-Jensen

E-texteditor just got out of beta. I have actively contributed with improvement suggestions and error reports, as this editor has all needed features for rapid web devlopment, and has potential to become even better. I suggest you check out the inspiring screencast and perhaps buy a trial if you like it. More info: E-Texteditor website: […]