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#!/usr/bin/env python
"""
Simple script to quickly change the symbolic link to your nipy source branch.
When you build your source branch, perform an inplace build::
cd trunk-lp # directory containing 'nipy' package directory
python setup.py build_ext --inplace
Then ``mynipy`` will update the symlink in your site-packages directory
to point to the branch you specify. This allows you to quickly switch
your working version of nipy without having to reinstall to your
site-packages or modify your PYTHONPATH.
Install
-------
We don't have a proper installer yet, simply copy this into a bin
directory and make sure it's permissions are executable. For instance,
I installed mynipy in my local bin directory::
$HOME/local/bin/mynipy
Usage
-----
From your nipy-repo, which has several nipy branches as
subdirectories like this::
nipy-repo/trunk-lp
nipy-repo/trunk-dev
nipy-repo/trunk-mbrett
This will make the 'trunk-mbrett' my current nipy package::
$ mynipy trunk-mbrett
"""
import os
from os.path import join as pjoin, split as psplit, \
isdir, isfile, abspath
import sys
import subprocess
cwd = os.getcwd()
try:
nipypath = abspath(sys.argv[1])
except IndexError: # default, current directory
nipypath = cwd
nipy_pkg_path = pjoin(nipypath, 'nipy')
if not isdir(nipy_pkg_path):
raise OSError('No nipy path in input path ' + nipypath)
print "Changing 'nipy' path to: \n ", nipy_pkg_path, "\n"
# Find where nipy is now. If we're in a source branch directory, the
# 'import nipy' below would give us the source dir, not the
# site-packages directory, so we ..
if isdir('nipy') and isfile(pjoin('nipy', '__init__.py')):
if cwd in sys.path:
sys.path.remove(cwd)
os.chdir('..')
try:
import nipy
site_pkgs, nipy_ln = psplit(nipy.__path__[0])
except ImportError:
# first time this script is run, we'll place it where numpy is installed
try:
import numpy
except ImportError:
raise ImportError('Unable to determine where to install nipy.')
else:
print 'First developer install of nipy,'
print '\t installing nipy link with numpy is installed.'
site_pkgs, numpy_ln = psplit(numpy.__path__[0])
site_pkgs = pjoin(site_pkgs, 'nipy')
cmd = 'ln -sf %s %s' % (nipy_pkg_path, site_pkgs)
print cmd
subprocess.call(cmd, shell=True)
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