72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
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#
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# Copyright 2014 Jon Wayne Parrott, [proppy], Michael R. Bernstein
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Notes:
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# - Imported from https://github.com/jonparrott/Darth-Vendor/.
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# - Added license header.
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# - Renamed `darth.vendor` to `vendor.add` to match upcoming SDK interface.
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# - Renamed `position` param to `index` to match upcoming SDK interface.
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# - Removed funny arworks docstring.
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import site
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import os.path
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import sys
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def add(folder, index=1):
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"""
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Adds the given folder to the python path. Supports namespaced packages.
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By default, packages in the given folder take precedence over site-packages
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and any previous path manipulations.
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Args:
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folder: Path to the folder containing packages, relative to ``os.getcwd()``
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position: Where in ``sys.path`` to insert the vendor packages. By default
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this is set to 1. It is inadvisable to set it to 0 as it will override
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any modules in the current working directory.
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"""
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# Check if the path contains a virtualenv.
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site_dir = os.path.join(folder, 'lib', 'python' + sys.version[:3], 'site-packages')
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if os.path.exists(site_dir):
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folder = site_dir
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# Otherwise it's just a normal path, make it absolute.
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else:
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folder = os.path.join(os.path.dirname(__file__), folder)
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# Use site.addsitedir() because it appropriately reads .pth
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# files for namespaced packages. Unfortunately, there's not an
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# option to choose where addsitedir() puts its paths in sys.path
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# so we have to do a little bit of magic to make it play along.
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# We're going to grab the current sys.path and split it up into
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# the first entry and then the rest. Essentially turning
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# ['.', '/site-packages/x', 'site-packages/y']
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# into
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# ['.'] and ['/site-packages/x', 'site-packages/y']
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# The reason for this is we want '.' to remain at the top of the
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# list but we want our vendor files to override everything else.
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sys.path, remainder = sys.path[:1], sys.path[1:]
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# Now we call addsitedir which will append our vendor directories
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# to sys.path (which was truncated by the last step.)
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site.addsitedir(folder)
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# Finally, we'll add the paths we removed back.
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# The final product is something like this:
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# ['.', '/vendor-folder', /site-packages/x', 'site-packages/y']
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sys.path.extend(remainder)
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