[patch #6107] Patch to add transparent decompression

[Reuben Thomas]

Follow-up Comment #3, patch #6107 (project grep):

After discussion on bug-grep, it seems that a generalized filter is preferred.
I have a design for this, but I have not implemented it, as it would be easy
to implement given an implementation in gnulib of the "ig" flavour of
pipe-filter, which currently does not exist. That would enable a simple and
non-invasive patch.

If pipe-filter-ig is forthcoming, I'll happily produce the patch, which would
add a --filter=PROGRAM flag which pipes all input through the given filter.
Transparent decompression is achieved by making the filter "zcat".

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