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75 lines
2.9 KiB
75 lines
2.9 KiB
9 years ago
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#!/usr/bin/python
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# (c) 2015 Taeyeon Mori
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# A simple script to make ln -s less painful
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#
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# Because of how symbolic links work (they're just a pathname that the OS reads and follows),
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# the link target path must always be relative to the symlink's containing directory, OR
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# an absolute path altogether. Unfortunately, ln -s does not automatically solve this issue
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# which makes it painful to create a relative symlink somewhere outside the current working
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# directory (It screws up shell completion for instance)
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# This script performs the path transformation before creating the link and can therefore be
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# used without worries of creating broken symlinks because one forgot to apply the correct
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# relative adjustment to the target path
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#
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# ex:
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# $ lns -v some-file dir/some-link
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# ln -s '../some-file' 'dir/some-link'
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# $ lns -v file ../derp/link # inside a directory called 'herp'
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# ln -s '../herp/file' '../derp/link'
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import os
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import argparse
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def transport_relpath(path, old_anchor, new_anchor):
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"""
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:brief: Transport a relative path from one anchor to another
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Anchors must both be absolute paths, path must be relative (to old_anchor)
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"""
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return os.path.relpath(os.path.normpath(os.path.join(old_anchor, path)), new_anchor)
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def verbose_symlink(target, dest):
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print("ln -s '%s' '%s'" % (target, dest))
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return os.symlink(target, dest)
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def main(argv):
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# Command line interface to make_symlink()
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parser = argparse.ArgumentParser(prog=argv[0],
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description="A 'ln -s' command that automatically translates relative target paths to be relative to the resulting symlink's containing directory when necessary.")
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parser.add_argument("target", help="The file(s) to create symlink(s) to", nargs="+")
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parser.add_argument("destination", help="The path of the symbolic link(s) to create")
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parser.add_argument("-v", "--verbose", help="Print every operation",
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dest="symlink", const=verbose_symlink, action="store_const", default=os.symlink)
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args = parser.parse_args(argv[1:])
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# Multiple
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if len(args.target) > 1:
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if not os.path.isdir(args.destination):
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print("Destination must be an existing directory when multiple targets are passed!")
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for target in args.target:
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dest = os.path.join(args.destination, os.path.basename(target))
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args.symlink(target if os.path.isabs(target) else transport_relpath(target, os.curdir, args.destination), dest)
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# One
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else:
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target = args.target[0]
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dest = ldir = args.destination
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if os.path.isdir(dest):
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dest = os.path.join(dest, os.path.basename(target))
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else:
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ldir = os.path.dirname(dest)
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args.symlink(target if os.path.isabs(target) else transport_relpath(target, os.curdir, ldir), dest)
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return 0
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if __name__ == "__main__":
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import sys
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sys.exit(main(sys.argv))
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