Add pkgs.haskell.lib.readDirectory
utility
This adds a `readDirectory` utility that can be used to "slurp" a directory full of `cabal2nix`-generated files and transform them into a Haskell package override set. The main use of this is so that users don't have to write: ``` { overrides = self: super: { foo = self.callPackage ./path/to/foo.nix { }; bar = self.callPackage ./path/to/bar.nix { }; ... }; } ``` Instead, they can write: ``` { overrides = pkgs.haskell.lib.readDirectory ./path/to; } ``` This is a an alternative to `packageSourceOverrides` which primarily addresses the following use cases: * The desired package is not yet available in `all-cabal-hashes` (perhaps the user is pinned to an older revision of `nixpkgs`) * The default `cabal2nix` invocation used by `packageSourceOverrides` does not use the desired `cabal2nix` flags * The user wants to avoid the use of import-from-derivation
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@ -382,4 +382,23 @@ rec {
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allPkgconfigDepends;
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};
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# Utility to convert a directory full of `cabal2nix`-generated files into a
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# package override set
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#
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# readDirectory : Directory -> HaskellPackageOverrideSet
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readDirectory =
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directory:
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self: super:
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let
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haskellPaths = builtins.attrNames (builtins.readDir directory);
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toKeyVal = file: {
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name = builtins.replaceStrings [ ".nix" ] [ "" ] file;
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value = self.callPackage (directory + "/${file}") { };
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};
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in
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builtins.listToAttrs (map toKeyVal haskellPaths);
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}
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