74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
"""
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Bootstrap script for IDLE as an application bundle.
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"""
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import sys, os
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# Change the current directory the user's home directory, that way we'll get
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# a more useful default location in the open/save dialogs.
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os.chdir(os.path.expanduser('~/Documents'))
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# Make sure sys.executable points to the python interpreter inside the
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# framework, instead of at the helper executable inside the application
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# bundle (the latter works, but doesn't allow access to the window server)
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#
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# .../IDLE.app/
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# Contents/
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# MacOS/
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# IDLE (a python script)
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# Python{-32} (symlink)
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# Resources/
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# idlemain.py (this module)
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# ...
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#
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# ../IDLE.app/Contents/MacOS/Python{-32} is symlinked to
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# ..Library/Frameworks/Python.framework/Versions/m.n
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# /Resources/Python.app/Contents/MacOS/Python{-32}
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# which is the Python interpreter executable
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#
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# The flow of control is as follows:
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# 1. IDLE.app is launched which starts python running the IDLE script
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# 2. IDLE script exports
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# PYTHONEXECUTABLE = .../IDLE.app/Contents/MacOS/Python{-32}
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# (the symlink to the framework python)
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# 3. IDLE script alters sys.argv and uses os.execve to replace itself with
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# idlemain.py running under the symlinked python.
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# This is the magic step.
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# 4. During interpreter initialization, because PYTHONEXECUTABLE is defined,
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# sys.executable may get set to an unuseful value.
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#
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# (Note that the IDLE script and the setting of PYTHONEXECUTABLE is
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# generated automatically by bundlebuilder in the Python 2.x build.
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# Also, IDLE invoked via command line, i.e. bin/idle, bypasses all of
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# this.)
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#
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# Now fix up the execution environment before importing idlelib.
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# Reset sys.executable to its normal value, the actual path of
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# the interpreter in the framework, by following the symlink
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# exported in PYTHONEXECUTABLE.
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pyex = os.environ['PYTHONEXECUTABLE']
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sys.executable = os.path.join(sys.prefix, 'bin', 'python%d.%d'%(sys.version_info[:2]))
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# Remove any sys.path entries for the Resources dir in the IDLE.app bundle.
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p = pyex.partition('.app')
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if p[2].startswith('/Contents/MacOS/Python'):
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sys.path = [value for value in sys.path if
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value.partition('.app') != (p[0], p[1], '/Contents/Resources')]
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# Unexport PYTHONEXECUTABLE so that the other Python processes started
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# by IDLE have a normal sys.executable.
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del os.environ['PYTHONEXECUTABLE']
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# Look for the -psn argument that the launcher adds and remove it, it will
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# only confuse the IDLE startup code.
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for idx, value in enumerate(sys.argv):
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if value.startswith('-psn_'):
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del sys.argv[idx]
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break
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# Now it is safe to import idlelib.
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from idlelib.PyShell import main
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if __name__ == '__main__':
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main()
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