1 files changed, 82 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/agda/default.nix b/nixpkgs/pkgs/build-support/agda/default.nix
new file mode 100644
index 000000000000..3c973e8cc0ac
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/agda/default.nix
@@ -0,0 +1,82 @@
+# Builder for Agda packages.
+
+{ stdenv, lib, self, Agda, runCommandNoCC, makeWrapper, writeText, mkShell, ghcWithPackages }:
+
+with lib.strings;
+
+let
+  withPackages' = {
+    pkgs,
+    ghc ? ghcWithPackages (p: with p; [ ieee ])
+  }: let
+    pkgs' = if builtins.isList pkgs then pkgs else pkgs self;
+    library-file = writeText "libraries" ''
+      ${(concatMapStringsSep "\n" (p: "${p}/${p.libraryFile}") pkgs')}
+    '';
+    pname = "agdaWithPackages";
+    version = Agda.version;
+  in runCommandNoCC "${pname}-${version}" {
+    inherit pname version;
+    nativeBuildInputs = [ makeWrapper ];
+    passthru.unwrapped = Agda;
+  } ''
+    mkdir -p $out/bin
+    makeWrapper ${Agda}/bin/agda $out/bin/agda \
+      --add-flags "--with-compiler=${ghc}/bin/ghc" \
+      --add-flags "--library-file=${library-file}" \
+      --add-flags "--local-interfaces"
+    makeWrapper ${Agda}/bin/agda-mode $out/bin/agda-mode
+    ''; # Local interfaces has been added for now: See https://github.com/agda/agda/issues/4526
+
+  withPackages = arg: if builtins.isAttrs arg then withPackages' arg else withPackages' { pkgs = arg; };
+
+  extensions = [
+    "agda"
+    "agda-lib"
+    "agdai"
+    "lagda"
+    "lagda.md"
+    "lagda.org"
+    "lagda.rst"
+    "lagda.tex"
+  ];
+
+  defaults =
+    { pname
+    , buildInputs ? []
+    , everythingFile ? "./Everything.agda"
+    , libraryName ? pname
+    , libraryFile ? "${libraryName}.agda-lib"
+    , buildPhase ? null
+    , installPhase ? null
+    , extraExtensions ? []
+    , ...
+    }: let
+      agdaWithArgs = withPackages (builtins.filter (p: p ? isAgdaDerivation) buildInputs);
+    in
+      {
+        inherit libraryName libraryFile;
+
+        isAgdaDerivation = true;
+
+        buildInputs = buildInputs ++ [ agdaWithArgs ];
+
+        buildPhase = if buildPhase != null then buildPhase else ''
+          runHook preBuild
+          agda -i ${dirOf everythingFile} ${everythingFile}
+          runHook postBuild
+        '';
+
+        installPhase = if installPhase != null then installPhase else ''
+          runHook preInstall
+          mkdir -p $out
+          find \( ${concatMapStringsSep " -or " (p: "-name '*.${p}'") (extensions ++ extraExtensions)} \) -exec cp -p --parents -t "$out" {} +
+          runHook postInstall
+        '';
+      };
+in
+{
+  mkDerivation = args: stdenv.mkDerivation (args // defaults args);
+
+  inherit withPackages withPackages';
+}