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{ runCommand, haskellPackages, lib, all-cabal-hashes, writeShellScript }:
let
# Checks if the version looks like a Haskell PVP version which is the format
# Hackage enforces. This will return false if the version strings is empty or
# we've overridden the package to ship an unstable version of the package
# (sadly there's no good way to show something useful on hackage in this case).
isPvpVersion = v: builtins.match "([0-9]+)(\\.[0-9]+)*" v != null;
pkgLine = name: pkg:
let
version = pkg.version or "";
in
if isPvpVersion version then
''"${name}","${version}","http://hydra.nixos.org/job/nixpkgs/trunk/haskellPackages.${name}.x86_64-linux"''
else "";
all-haskellPackages = builtins.toFile "all-haskellPackages" (lib.concatStringsSep "\n" (lib.filter (x: x != "") (lib.mapAttrsToList pkgLine haskellPackages)));
in
runCommand "hackage-package-list" { }
# This command will make a join between all packages on hackage and haskellPackages.*.
# It creates a valid csv file which can be uploaded to hackage.haskell.org.
# The call is wrapped in echo $(...) to trim trailing newline, which hackage requires.
''
mkdir -p $out/bin
echo -n "$(tar -t -f ${all-cabal-hashes} | sed 's![^/]*/\([^/]*\)/.*!"\1"!' | sort -u | join -t , - ${all-haskellPackages})" > $out/nixos-hackage-packages.csv
''
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