On 31 Oct, 2012, at 13:38, Daniel Holth <dho...@gmail.com> wrote:
> On Wed, Oct 24, 2012 at 7:04 AM, Ronald Oussoren <ronaldousso...@mac.com>
> wrote:
>>
>> On 18 Oct, 2012, at 19:29, Daniel Holth <dho...@gmail.com> wrote:
>>
>>> I'd like to submit the Wheel PEPs 425 (filename metadata), 426
>>> (Metadata 1.3), and 427 (wheel itself) for acceptance. The format has
>>> been stable since May and we are preparing a patch to support it in
>>> pip, but we need to earn consensus before including it in the most
>>> widely used installer.
>>
>> PEP 425:
>>
>> * "The version is py_version_nodot. CPython gets away with no dot, but if
>> one is needed the underscore _ is used instead"
>>
>> I don't particularly like replacing dots by underscores. That needed
>> because you use the dot character in compressed tag sets, but why not use a
>> comma to separate items in the compressed tag set?
>>
>> * "The platform tag is simply distutils.util.get_platform() with all hyphens
>> - and periods . replaced with underscore _."
>>
>> Why the replacement? The need for replacement could be avoided by using a
>> different separator between elements of a tag (for example "~" or "+"), and
>> furthermore the platform tag is at a know
>> location, and hence the use of hyphens in the platform tag is harmless
>> (use "python_tag, abi_tag, platform_tag = tag.split('-', 2)" to split the
>> tag into its elements.
>>
>> * "compressed tag sets"
>>
>> Using '"," instead of "." to separate elements of the tag set takes away
>> the need to replace dots in tag elements, and seems more natural to me
>> (you'd also use comma to separate the elements
>> when you write them down in prose or python code.
>
> I can't get excited about changing the convention. The
> hyphen-to-underscore folding and - separated file parts is the same as
> what setuptools uses. _ folding for . as well in the compat tags? It
> may not be beautiful but it is very unlikely to cause ambiguity.
Beauty is also important.
BTW. Setuptools does not fold '-' to underscore in the tag:
xs_image-1.0-py2.7-linux-x86_64.egg
This would be "xs_image-1.0-cp27-cp27-linux_x86_64.whl" in your scheme (a
binary package for CPython 2.7, platform is Linux x86_64). Replacing characters
is especially ugly on OSX, compare "xs_image-1.0-cp27-cp27-macosx_10_3_fat.whl"
and "xs_image-1.0-cp27-cp27-macosx-10.3-fat.whl".
As I've written before, it is not necessary to replace characters in the
platform tag because it is the last part of the filename anyway.
Ronald
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