From mboxrd@z Thu Jan  1 00:00:00 1970
From: ericbavier@openmailbox.org
Subject: Re: [PATCH] gnu: Add ghc-regex-tdfa-rc.
Date: Thu, 22 Oct 2015 03:47:40 -0500
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To: guix-devel@gnu.org, Paul van der Walt <paul@denknerd.org>

From: Eric Bavier <ericbavier@openmailbox.org>

> * gnu/packages/haskell.scm (ghc-regex-tdfa-rc): New variable.
> ---
>  gnu/packages/haskell.scm | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
> index be37c5a..810dfb1 100644
> --- a/gnu/packages/haskell.scm
> +++ b/gnu/packages/haskell.scm
> @@ -1132,6 +1132,34 @@ Both IPv4 and IPv6 are supported.")
>       "Interface API for regex-posix, pcre, parsec, tdfa, dfa.")
>      (license bsd-3)))
>  
> +(define-public ghc-regex-tdfa-rc
> +  (package
> +    (name "ghc-regex-tdfa-rc")
> +    (version "1.1.8.3")
> +    (source
> +     (origin
> +       (method url-fetch)
> +       (uri (string-append
> +             "http://hackage.haskell.org/package/regex-tdfa-rc/regex-tdfa-rc-"
> +             version
> +             ".tar.gz"))
> +       (sha256
> +        (base32
> +         "1vi11i23gkkjg6193ak90g55akj69bhahy542frkwb68haky4pp3"))))
> +    (build-system haskell-build-system)
> +    (propagated-inputs
> +     `(("ghc-regex-base" ,ghc-regex-base)
> +       ("ghc-parsec" ,ghc-parsec)))
> +    (inputs
> +     `(("ghc-mtl" ,ghc-mtl)))

I would be surprised if this did not also need to be propagated, but I confess
I do not know of a reliable way to check.

> +    (home-page
> +     "http://hackage.haskell.org/package/regex-tdfa")
> +    (synopsis "Replaces/Enhances Text.Regex")

How about: "Tagged DFA regex engine for Haskell"

`~Eric