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Convert a Name metadata value to a .egg-link name, by applying
the same substitution as pkg_resources's safe_name function.
Note: we cannot use canonicalize_name because it has a different logic.
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Look for a .egg-link file for project name, by walking sys.path.
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Return the path for the .egg-link file if it exists, otherwise, None.
There's 3 scenarios:
1) not in a virtualenv
try to find in site.USER_SITE, then site_packages
2) in a no-global virtualenv
try to find in site_packages
3) in a yes-global virtualenv
try to find in site_packages, then site.USER_SITE
(don't look in global location)
For #1 and #3, there could be odd cases, where there's an egg-link in 2
locations.
This method will just return the first one found.
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