revset: optimize 'or' operation of trivial revisions to a list As seen in issue4565 and issue4624, GUI wrappers and automated scripts are likely to generate a long query that just has numeric revisions joined by 'or'. One reason why is that they allows users to choose arbitrary revisions from a list. Because this use case isn't handled well by smartset, let's optimize it to a plain old list. Benchmarks: 1) reduce nesting of chained 'or' operations 2) optimize to a list (this patch) revset #0: 0 + 1 + 2 + ... + 1000 1) wall 0.483341 comb 0.480000 user 0.480000 sys 0.000000 (best of 20) 2) wall 0.025393 comb 0.020000 user 0.020000 sys 0.000000 (best of 107) revset #1: sort(0 + 1 + 2 + ... + 1000) 1) wall 0.035240 comb 0.040000 user 0.040000 sys 0.000000 (best of 100) 2) wall 0.026432 comb 0.030000 user 0.030000 sys 0.000000 (best of 102) revset #2: first(0 + 1 + 2 + ... + 1000) 1) wall 0.028949 comb 0.030000 user 0.030000 sys 0.000000 (best of 100) 2) wall 0.025503 comb 0.030000 user 0.030000 sys 0.000000 (best of 106)

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# A dummy extension that installs an hgweb command that throws an Exception.

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from mercurial.hgweb import webcommands

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def raiseerror(web, req, tmpl):

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    '''Dummy web command that raises an uncaught Exception.'''

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    # Simulate an error after partial response.

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    if 'partialresponse' in req.form:

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        req.respond(200, 'text/plain')

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        req.write('partial content\n')

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    raise AttributeError('I am an uncaught error!')

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def extsetup(ui):

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    setattr(webcommands, 'raiseerror', raiseerror)

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    webcommands.__all__.append('raiseerror')