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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mkfifo p

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hg serve --stdio < p &

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P=$!

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(echo lock; echo addchangegroup; sleep 5) > p &

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Q=$!

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sleep 1

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kill -HUP $P

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sleep 1

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ls .hg

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