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 a > a

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hg add a

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hg commit -m "test" -d "0 0"

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hg history

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hg tag -d "0 0" "bleah" 

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hg history

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echo foo >> .hgtags

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hg tag -d "0 0" "bleah2" || echo "failed" 

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