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| -rw-r--r-- | _posts/2012-10-31-virtualenv-and-checkouts.textile | 33 |
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diff --git a/_posts/2012-10-31-virtualenv-and-checkouts.textile b/_posts/2012-10-31-virtualenv-and-checkouts.textile new file mode 100644 index 0000000..ddc91b6 --- /dev/null +++ b/_posts/2012-10-31-virtualenv-and-checkouts.textile @@ -0,0 +1,33 @@ +--- +layout: post +category: python +title: Virtualenv and checkouts +--- + +I've started to do some Clojure in my spare time. The default tool adopted by the community to manage projects is "leiningen":http://leiningen.org. For those of you who don't know what @lein@ is, it's a tool to automate your Clojure project: it will boostrap a new project, install the dependencies, and there's a plugin mechanism to extend the default possibilities of the tool. + +One of the nice feature of the tool is the *checkouts/* directory. From the "FAQ":https://github.com/technomancy/leiningen/blob/preview/doc/FAQ.md : + +bq. If you create a directory named checkouts in your project root and symlink some other project roots into it, Leiningen will allow you to hack on them in parallel. + +For Python projects at "$work":http://www.saymedia.com/careers I use "virtualenvwrapper":http://virtualenvwrapper.readthedocs.org/en/latest/ to easily work on them without having to deal with conflicting dependencies. When I need to change a library that is used by one of the project, usually I go to the virtualenv directory and create a symlink so it uses the one I'm editing. + +What I really want is a mechanism similar to @lein@, where I can have a *checkouts/* directory inside the main project, where I can clone a library or create a symlink. Since @virtualenvwrapper@ provides a hook mechanism, I wrote a small hook inside @~/.virtualenvs/postactivate@: + +{% highlight bash %} +#!/bin/bash + +# move to the directory of the project +proj_name=$(echo $VIRTUAL_ENV|awk -F'/' '{print $NF}') +proj_path=/home/vagrant/src/$proj_name + +cd $proj_path + +if [ -d checkouts ]; then + for ext in $(ls checkouts); do + export PYTHONPATH=proj_path/checkouts/$ext:$PYTHONPATH + done +fi +{% endhighlight %} + +Then, when I type @workon $project_name@ in my shell, the environment is activated, I'm moved to the right directory, and the library inside the *checkouts/* directory are added to my @PYTHONPATH@. |