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opener: introduce tryread helper This makes it easier to follow the common pattern "read a file or give an empty string if it's missing".
author Matt Mackall <mpm@selenic.com>
date Tue, 17 Apr 2012 11:11:59 -0500
parents 659f34b833b9
children 73e4a02e6d23
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16454:92c7e917b647 16455:154219f3a6a4