cabal

Is there a simple commend / option that lets you do that? I could use grep but I wonder if there is a builtin option? frmsaul We can simply do: cabal list --installed 来源： https://stackoverflow.com/questions/36953396/how-to-list-the-installed-packages-in-cabal

I'm trying to use stack to load my test-suite in ghci and have it load the QuickCheck and hspec dependency. How can I do this? I'm using the franklinchen template. https://github.com/commercialhaskell/stack-templates/blob/master/franklinchen.hsfiles I have tried stack ghci spec stack ghci test-suite stack ghci --main-is spec I modified the test-suite spec to target the main-is: LibSpec.hs file test-suite spec default-language: Haskell2010 ghc-options: -Wall type: exitcode-stdio-1.0 hs-source-dirs: test main-is: LibSpec.hs build-depends: base , chapterexercises , hspec , QuickCheck stack ghci -

Is it possible to tell Cabal to expose all modules while building a library? Right now I have to provide very long list of modules in the Exposed-modules cabal configurtion file section. The modern answer is stack + hpack instead of using explicit cabal config. It could automatically expose package modules and provides many other enhancements. You have to list all modules in the cabal configuration file. In your case, you just put the list of modules after exposed-module: . There is no simpler way to write a list of modules. Cabal cannot automatically find the files that are part of an

With the following project structure: src/FirstExecutable.hs src/SecondExecutable.hs my-amazing-project.cabal and the following cabal setup: name: my-amazing-project version: 0.1.0.0 build-type: Simple cabal-version: >=1.8 executable first-executable hs-source-dirs: src main-is: FirstExecutable.hs ghc-options: -O2 -threaded -with-rtsopts=-N build-depends: base == 4.5.* executable second-executable hs-source-dirs: src main-is: SecondExecutable.hs ghc-options: -O2 -threaded -with-rtsopts=-N build-depends: base == 4.5.* Running cabal install fails with the following output: Installing executable

I've been using Scala with SBT quite a bit lately. The REPL loop of has a handy feature: ~ COMMAND , meaning perform COMMAND for every source file change in the project. For instance: ~ test and ~ compile are terrifically useful for rapid development. I wonder, does anyone know of something similar for Haskell, a cabal shell, maybe? You can get something like this very easily using inotifywait . Just fire up a terminal in your project directory and run something like this: $ while inotifywait -qq -r -e modify .; do cabal build && ./dist/build/tests/tests; done This also works for any other

While evaluating the line "import Control.Monad.State" in a Haskell module, GHC gives me the following error: Could not find module `Control.Monad.State': it was found in multiple packages: monads-fd-0.0.0.1 mtl-1.1.0.2 Failed, modules loaded: none. How do I resolve this conflict? Reid Barton You have several options. Either: ghc-pkg hide monads-fd . This will cause GHC and GHCi to ignore the presence of the monads-fd by default until you later ghc-pkg expose monads-fd , but software installed by Cabal will still be able to build against it. Use the {-# LANGUAGE PackageImports #-} pragma, and

With respect to how packages are created, installed and used in Haskell, what is the relationship between ghc-pkg and cabal ? What are their roles - when would you use one, over the other, or use both? Are they complementary tools, competitive tools, or simply tools that do different jobs? Graphically, the dependencies are: Packages GHC can use | Are registered with "ghc-pkg register" | And (almost always) built with Cabal | With build dependencies resolved by cabal-install | From Hackage. ghc-pkg is a direct interface to GHC's package database. Cabal is a tool that provides a consistent