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{ stdenv, lib, haskellPackages, haskell, removeReferencesTo }:
let
# Since pandoc 3.0 the pandoc binary resides in the pandoc-cli package.
static = haskell.lib.compose.justStaticExecutables haskellPackages.pandoc-cli;
in
(haskell.lib.compose.overrideCabal (drv: {
# pandoc-cli's pandoc executable report the libraries version via --version, match that,
inherit (static.scope.pandoc) version;
# but prevent haskellPackages.mkDerivation from recomputing the src tarball based on that.
inherit (static) src;
# Make it possible to recover the cli version if necessary.
passthru = drv.passthru or {} // {
cliVersion = static.version;
};
configureFlags = drv.configureFlags or [] ++ ["-fembed_data_files"];
buildDepends = drv.buildDepends or [] ++ [haskellPackages.file-embed];
buildTools = (drv.buildTools or []) ++ [ removeReferencesTo ];
# Normally, the static linked executable shouldn't refer to any library or the compiler.
# This is not always the case when the dependency has Paths_* module generated by Cabal,
# where bindir, datadir, and libdir contain the path to the library, and thus make the
# executable indirectly refer to GHC. However, most Haskell programs only use Paths_*.version for
# getting the version at runtime, so it's safe to remove the references to them.
# This is true so far for pandoc-types and warp.
# For details see: https://github.com/NixOS/nixpkgs/issues/34376
postInstall = drv.postInstall or "" + ''
remove-references-to \
-t ${haskellPackages.pandoc-types} \
$out/bin/pandoc
remove-references-to \
-t ${haskellPackages.warp} \
$out/bin/pandoc
remove-references-to \
-t ${haskellPackages.pandoc_3_1_8} \
$out/bin/pandoc
'' + lib.optionalString (stdenv.buildPlatform == stdenv.hostPlatform) ''
mkdir -p $out/share/bash-completion/completions
$out/bin/pandoc --bash-completion > $out/share/bash-completion/completions/pandoc
'';
}) static).overrideAttrs (drv: {
# These libraries are still referenced, because they generate
# a `Paths_*` module for figuring out their version.
# The `Paths_*` module is generated by Cabal, and contains the
# version, but also paths to e.g. the data directories, which
# lead to a transitive runtime dependency on the whole GHC distribution.
# This should ideally be fixed in haskellPackages (or even Cabal),
# but a minimal pandoc is important enough to patch it manually.
disallowedReferences = [ haskellPackages.pandoc-types haskellPackages.warp haskellPackages.pandoc_3_1_8 ];
})
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