[issue2018] Implement FSL to select files in hg convert extension

[Olemis Lang]

New submission from Olemis Lang <olemis+hg at gmail.com>:

Use FSL syntax [1]_ to specify the files to (consider | ignore) while using `hg 
convert` extension. This will allow fine grained selection, more flexibility and 
readability.

.. [1] File Selection Language Reference
        (http://www.cs.helsinki.fi/u/hkovaska/fsl/language.html)

PS: Probably some rules (e.g. `age`, `date`, `extract`, `now`, `size`) are not 
useful but it's up to you to determine what could be helpful or not, at least it 
is more easy, less error prone and more flexible to describe the target files 
this way.

----------
messages: 11580
nosy: olemis
priority: wish
status: unread
title: Implement FSL to select files in hg convert extension
topic: convert

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