[PATCH 01 of 10] contrib: have import-checker work mostly with native strings for mod names

[Augie Fackler]

> On Aug 28, 2017, at 02:55, Martin von Zweigbergk <martinvonz at google.com> wrote:
> 
> On Wed, Aug 23, 2017 at 7:55 AM, Augie Fackler <raf at durin42.com> wrote:
>> # HG changeset patch
>> # User Augie Fackler <raf at durin42.com>
>> # Date 1503421161 14400
>> #      Tue Aug 22 12:59:21 2017 -0400
>> # Node ID e915b9703f675b2f76c512347ddff0f6c65a9748
>> # Parent  edf503e5dfd408f900f3bad0a6923573813e276b
>> contrib: have import-checker work mostly with native strings for mod names
>> 
>> Module names are a bit awkward to deal with portably otherwise.
>> 
>> diff --git a/contrib/import-checker.py b/contrib/import-checker.py
>> --- a/contrib/import-checker.py
>> +++ b/contrib/import-checker.py
>> @@ -147,6 +147,8 @@ def fromlocalfunc(modulename, localmods)
>>>>> fromlocal2('bar', 2)
>>     ('foo.bar', 'foo.bar.__init__', True)
>>     """
>> +    if not isinstance(modulename, str):
>> +        modulename = modulename.decode('ascii')
> 
> Should this be 'if isinstance(modulename, bytes)' instead? That seems
> clearer to me.

Clearer, but wrong, because str == bytes on Python 2 and you'd end up decoding to a unicode rather than to a native string.

> Also, 'abc'.decode('ascii') seems to fail on Py3. Is
> that a concern?

No, because 'abc' is instance str, so you wouldn't evaluate the body of the if statement.

> 
>>     prefix = '.'.join(modulename.split('.')[:-1])
>>     if prefix:
>>         prefix += '.'
>> @@ -406,6 +408,8 @@ def verify_modern_convention(module, roo
>>     * Certain modules must be aliased to alternate names to avoid aliasing
>>       and readability problems. See `requirealias`.
>>     """
>> +    if not isinstance(module, str):
>> +        module = module.decode('ascii')
>>     topmodule = module.split('.')[0]
>>     fromlocal = fromlocalfunc(module, localmods)
>> 
>> @@ -724,6 +728,9 @@ def main(argv):
>>         localmodpaths[modname] = source_path
>>     localmods = populateextmods(localmodpaths)
>>     for localmodname, source_path in sorted(localmodpaths.items()):
>> +        if not isinstance(localmodname, bytes):
>> +            # This is only safe because all hg's files are ascii
>> +            localmodname = localmodname.encode('ascii')
>>         for src, modname, name, line in sources(source_path, localmodname):
>>             try:
>>                 used_imports[modname] = sorted(
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