mirror of
https://github.com/ilyakooo0/haskell.nix.git
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66 lines
1.9 KiB
Nix
66 lines
1.9 KiB
Nix
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# This provides a package set for each snapshot in Stackage.
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#
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# It allows you to use a bare snapshot without having to invoke
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# mkStackPkgSet with a stack.yaml project.
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#
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# A particular package in a snapshot would be accessed with:
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# snapshots."lts-13.18".conduit
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{ lib, mkPkgSet, stackage }:
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with lib;
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let
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mkSnapshot = name: pkg-def: (mkPkgSet {
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inherit pkg-def;
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pkg-def-extras = pkg-def-extras name;
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}).config.hsPkgs;
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# Tests whether snapshot name is an LTS within
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# the half-open version interval [start, end).
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ltsInRange = start: end: name: let
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components = splitString "-" name;
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version = concatStringsSep "-" (drop 1 components);
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in
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assert length components >= 2;
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head components == "lts"
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&& versionAtLeast version start
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&& versionOlder version end;
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# A function to get pkg-def-extras with build fixes for certain
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# snapshots.
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pkg-def-extras = let
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fixes = {
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# Work around a mismatch between stackage metadata and the
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# libraries shipped with GHC.
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# https://github.com/commercialhaskell/stackage/issues/4466
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fix-ghc-transformers = {
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predicate = ltsInRange "12" "14";
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extra = hackage: {
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packages = {
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"transformers" = (((hackage.transformers)."0.5.6.2").revisions).default;
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"process" = (((hackage.process)."1.6.5.0").revisions).default;
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};
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};
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};
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# Add hsc2hs to the snapshot. This is a build tool for many
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# packages. Stackage does not include it in the snapshots
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# because it is expected that hsc2hs comes with ghc.
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fix-hsc2hs = {
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extra = hackage: {
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packages = {
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"hsc2hs" = (((hackage.hsc2hs)."0.68.4").revisions).default;
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};
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};
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};
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};
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applyFix = name: fix: optional ((fix.predicate or (const true)) name) fix.extra;
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in
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name: concatLists (mapAttrsToList (_: applyFix name) fixes);
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in
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mapAttrs mkSnapshot stackage
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