shell.nix: init

1 files changed, 52 insertions, 0 deletions

diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..8887d3e
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,52 @@
+{ compiler ? "default" }: let
+
+  stockholm = import <stockholm>;
+
+  inherit (stockholm.systems.${lib.krops.getHostName}) config pkgs;
+  inherit (stockholm) lib;
+
+  haskellPackages =
+    if compiler == "default"
+      then pkgs.haskellPackages
+      else pkgs.haskell.packages.${compiler};
+
+  drv = haskellPackages.callPackage (import ./.) {};
+
+  exeName = "Reaktor";
+in
+
+  lib.overrideDerivation drv.env (oldAttrs: {
+    shellHook = ''
+      pname=${lib.shell.escape (lib.baseNameOf (toString ./.))}
+
+      WORKDIR=${toString ./.}
+      CACHEDIR=$HOME/tmp/$pname
+      HISTFILE=$CACHEDIR/bash_history
+
+      mkdir -p "$CACHEDIR"
+
+      main=$CACHEDIR/main-${lib.currentSystem}
+
+      build() {(
+        set -efu
+        cd "$WORKDIR"
+        options=$(
+          ${pkgs.cabal-read}/bin/ghc-options "$WORKDIR/$pname.cabal" ${exeName}
+        )
+        ghc $options \
+            -odir "$CACHEDIR" \
+            -hidir "$CACHEDIR" \
+            -o "$main" \
+            -isrc \
+            src/main.hs
+      )}
+
+      run() {(
+        set -efu
+        cd "$WORKDIR"
+        exec "$main" "$@"
+      )}
+
+      cd "$WORKDIR"
+    '';
+  })