[PATCH 1 of 7] tags: extract fnode retrieval in its own function

[Ryan McElroy]

Overall series mostly looks good to me, but there are enough grammar 
changes and a few questions to be addressed that I think a v2 would be 
worth it. I'll mark as changes requested in patchwork for now.


On 3/28/17 10:51 AM, Ryan McElroy wrote:
> On 3/28/17 7:16 AM, Pierre-Yves David wrote:
>> # HG changeset patch
>> # User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
>> # Date 1490673691 -7200
>> #      Tue Mar 28 06:01:31 2017 +0200
>> # Node ID 1e77e505e7bacf59d1200714dc92e827523d7301
>> # Parent  e6fd7930cf0b37710e379de37b7d87d5c1ea5dc9
>> # EXP-Topic tags
>> tags: extract fnode retrieval in its own function
>>
>> My main goal here is to be able to reuse this logic easily. As a side 
>> effect
>> this important logic is now insulated and the code is clearer.
>>
>> diff --git a/mercurial/tags.py b/mercurial/tags.py
>> --- a/mercurial/tags.py
>> +++ b/mercurial/tags.py
>> @@ -341,15 +341,27 @@ def _readtagcache(ui, repo):
>>           # potentially expensive search.
>>           return ([], {}, valid, None, True)
>>   -    starttime = util.timer()
>>         # Now we have to lookup the .hgtags filenode for every new head.
>>       # This is the most expensive part of finding tags, so performance
>>       # depends primarily on the size of newheads.  Worst case: no cache
>>       # file, so newheads == repoheads.
>> +    cachefnode = _getfnodes(ui, repo, repoheads)
>> +
>> +    # Caller has to iterate over all heads, but can use the 
>> filenodes in
>> +    # cachefnode to get to each .hgtags revision quickly.
>> +    return (repoheads, cachefnode, valid, None, True)
>> +
>> +def _getfnodes(ui, repo, nodes):
>> +    """return fnode for .hgtags in a list of node
>
> This comment doesn't quite parse for me. Maybe it should be "return 
> list of .hgtags fnodes for tags computation"
>
>> +
>> +    return value is a {node: fnode} mapping. their will be no entry 
>> for node
>
> s/their/there
> s/node/nodes (at end of line)
>
> Capitalization nitpicks: Return and There should be capitalized I think.
>
>> +    without a '.hgtags' file.
>> +    """
>> +    starttime = util.timer()
>>       fnodescache = hgtagsfnodescache(repo.unfiltered())
>>       cachefnode = {}
>> -    for head in reversed(repoheads):
>> +    for head in reversed(nodes):
>>           fnode = fnodescache.getfnode(head)
>>           if fnode != nullid:
>>               cachefnode[head] = fnode
>> @@ -361,10 +373,7 @@ def _readtagcache(ui, repo):
>>              '%d/%d cache hits/lookups in %0.4f '
>>              'seconds\n',
>>              fnodescache.hitcount, fnodescache.lookupcount, duration)
>> -
>> -    # Caller has to iterate over all heads, but can use the 
>> filenodes in
>> -    # cachefnode to get to each .hgtags revision quickly.
>> -    return (repoheads, cachefnode, valid, None, True)
>> +    return cachefnode
>>     def _writetagcache(ui, repo, valid, cachetags):
>>       filename = _filename(repo)
>>
>
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