TH to generate imports?

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Corentin Dupont

11 Jun 2015 11 Jun '15

5:12 a.m.

Hi guys, I wanted to know if it's possible to use TH on an "import" statement. What I want to do is to generate the names of the packages I need to import. For example: import $(genImport "MyPackage") genImport :: String -> Q TH.Exp genImport s = ... Is that possible? Thanks! Corentin

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Adam Bergmark

11 Jun 11 Jun

5:45 a.m.

https://ghc.haskell.org/trac/ghc/ticket/1475 On Thu, Jun 11, 2015 at 11:12 AM, Corentin Dupont

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wrote:

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Hi guys, I wanted to know if it's possible to use TH on an "import" statement. What I want to do is to generate the names of the packages I need to import. For example:

import $(genImport "MyPackage")

genImport :: String -> Q TH.Exp genImport s = ...

Is that possible? Thanks! Corentin

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Corentin Dupont

6:08 a.m.

Thanks! So, at the moment it's not possible? So is it possible instead to do: $(genPackage "MyPackage") import MyPackage The template Haskell expression would just create the Haskell package in a corresponding file, so we can import it. Nothing would be spliced in. On Thu, Jun 11, 2015 at 11:45 AM, Adam Bergmark wrote:

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https://ghc.haskell.org/trac/ghc/ticket/1475

On Thu, Jun 11, 2015 at 11:12 AM, Corentin Dupont < corentin.dupont@gmail.com> wrote:

...
Hi guys, I wanted to know if it's possible to use TH on an "import" statement. What I want to do is to generate the names of the packages I need to import. For example:

import $(genImport "MyPackage")

genImport :: String -> Q TH.Exp genImport s = ...

Is that possible? Thanks! Corentin

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Christopher Reichert

12:31 p.m.

On Thu, Jun 11 2015, Adam Bergmark wrote:

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https://ghc.haskell.org/trac/ghc/ticket/1475

HSpec uses the ghc -F -pgmF flags to run a custom pre-processor which generates imports before a testing. e.g. '{-# OPTIONS_GHC -F -pgmF hspec-discover #-}'. You might also find some inspiration in the 'imports' library on Hackage: http://hackage.haskell.org/package/imports-0.1.2.1. -Christopher

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On Thu, Jun 11, 2015 at 11:12 AM, Corentin Dupont
...
wrote:

...
Hi guys, I wanted to know if it's possible to use TH on an "import" statement. What I want to do is to generate the names of the packages I need to import. For example:

import $(genImport "MyPackage")

genImport :: String -> Q TH.Exp genImport s = ...

Is that possible? Thanks! Corentin

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

-- Christopher Reichert irc: creichert gpg: C81D 18C8 862A 3618 1376 FFA5 6BFC A992 9955 929B

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Adam Bergmark
Christopher Reichert
Corentin Dupont