From 19a0d9c2724695c9e05fe0b85bbbdf03ebeeec5b Mon Sep 17 00:00:00 2001
From: Minijackson <minijackson@riseup.net>
Date: Sun, 12 Jan 2020 13:23:58 +0100
Subject: nix: add proper derivation

---
 default.nix    | 10 ++++++++++
 derivation.nix | 27 +++++++++++++++++++++++++++
 nix-wrapper.sh |  8 ++++++++
 overlay.nix    |  5 +++++
 4 files changed, 50 insertions(+)
 create mode 100644 default.nix
 create mode 100644 derivation.nix
 create mode 100644 nix-wrapper.sh
 create mode 100644 overlay.nix

diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..20ee7ac
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,10 @@
+{ nixpkgs ? import <nixpkgs>, ... }:
+
+let
+  pkgs = nixpkgs {
+    config = {};
+    overlays = [
+      (import ./overlay.nix)
+    ];
+  };
+in pkgs.poseidoc
diff --git a/derivation.nix b/derivation.nix
new file mode 100644
index 0000000..e877c04
--- /dev/null
+++ b/derivation.nix
@@ -0,0 +1,27 @@
+{ stdenv, rustPlatform, llvm, libclang, clang, runtimeShell }:
+
+rustPlatform.buildRustPackage {
+  pname = "poseidoc";
+  version = "0.1";
+
+  src = ./.;
+
+  buildInputs = [ llvm libclang ];
+  LIBCLANG_PATH = "${libclang}/lib";
+
+  cargoSha256 = "0hrqzfzirq8xx32l969367xznlr6wf606xnwkqzknxdc2lxs7k40";
+
+  postFixup = ''
+    shell=${runtimeShell}
+    wrapped='.poseidoc-wrapped'
+    libc_includes='-idirafter "${clang.libc_dev}/include"'
+    cxx_stdlib_flags='$(echo -n "${clang.default_cxx_stdlib_compile}")'
+    resource_dir_flags='-resource-dir=${clang}/resource-root'
+
+    export shell wrapped libc_includes cxx_stdlib_flags resource_dir_flags
+
+    mv $out/bin/poseidoc $out/bin/$wrapped
+    substituteAll ${./nix-wrapper.sh} $out/bin/poseidoc
+    chmod --reference=$out/bin/$wrapped $out/bin/poseidoc
+  '';
+}
diff --git a/nix-wrapper.sh b/nix-wrapper.sh
new file mode 100644
index 0000000..451bdbb
--- /dev/null
+++ b/nix-wrapper.sh
@@ -0,0 +1,8 @@
+#! @shell@ -eu
+
+exec -a "$0" @out@/bin/@wrapped@ \
+	--clang-extra-args="@libc_includes@" \
+	--clang-extra-args="@cxx_stdlib_flags@" \
+	--clang-extra-args="@resource_dir_flags@" \
+	--clang-extra-args="${NIX_CFLAGS_COMPILE-}" \
+	"$@"
diff --git a/overlay.nix b/overlay.nix
new file mode 100644
index 0000000..20b3313
--- /dev/null
+++ b/overlay.nix
@@ -0,0 +1,5 @@
+self: super: {
+  poseidoc = self.callPackage ./derivation.nix {
+    inherit (self.llvmPackages) llvm libclang clang;
+  };
+}
-- 
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