Haskell: Difference between revisions
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To remove the additional latency overhead of a nix-shell, add GHC to <code>environment.systemPackages</code> and call <code>runghc</code> in the shebang.<syntaxhighlight lang="nix"> | To remove the additional latency overhead of a nix-shell, add GHC to <code>environment.systemPackages</code> and call <code>runghc</code> in the shebang.<syntaxhighlight lang="nix"> | ||
environment.systemPackages = with pkgs; [ | |||
... | |||
(ghc.withPackages (hsPkgs: with hsPkgs; [ | |||
turtle # Faster startup time with all external shell commands | |||
shh # Piping operators and other goodies | |||
shh-extras # Try shh as an interactive shell | |||
... # ...anything else you want! | |||
]) | |||
]; | |||
</syntaxhighlight>Here's a basic example using the Shh module rather than Turtle, so it can use the pipe operator:<syntaxhighlight lang="haskell"> | </syntaxhighlight>Here's a basic example using the Shh module rather than Turtle, so it can use the pipe operator:<syntaxhighlight lang="haskell"> | ||
#!/usr/bin/env runghc | #!/usr/bin/env runghc | ||
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For instance you can define your various projects in subfolders <code>./frontend</code> and <code>./backend</code> (you can use cabal init to create the content in each folder), then create a file <code>cabal.project</code> containing: | For instance you can define your various projects in subfolders <code>./frontend</code> and <code>./backend</code> (you can use cabal init to create the content in each folder), then create a file <code>cabal.project</code> containing: | ||
{{file|cabal.project| | {{file|cabal.project|haskell| | ||
<nowiki> | <nowiki> | ||
packages: | packages: | ||