grep: extend functionality, add man page entry, add unit test. walkchangerevs now returns a two-tuple. Its behaviour is also extensively commented. The annotate command's getname function has been factored out to a new function, trimname, so it can be shared between annotate and grep. The behaviour of grep has been beefed up, so that it now performs a number of useful functions.

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#!/bin/sh

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hg init

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echo 123 > a

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hg add a

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hg commit -m "first" -d "0 0" a

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mkdir sub

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echo 321 > sub/b

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hg add sub/b

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hg commit -m "second" -d "0 0" sub/b

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cat sub/b

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hg co 0

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cat sub/b

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ls sub

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true