From 66817dde5b3e8a2c846e111e4032c71c86bfd51b Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 23 Aug 2022 09:36:18 -0700
Subject: [PATCH] template for zig compiler dev

---
 flake.nix                         |  6 ++++
 templates/compiler-dev/.envrc     |  4 +++
 templates/compiler-dev/flake.lock | 60 +++++++++++++++++++++++++++++++
 templates/compiler-dev/flake.nix  | 39 ++++++++++++++++++++
 templates/compiler-dev/shell.nix  |  9 +++++
 5 files changed, 118 insertions(+)
 create mode 100644 templates/compiler-dev/.envrc
 create mode 100644 templates/compiler-dev/flake.lock
 create mode 100644 templates/compiler-dev/flake.nix
 create mode 100644 templates/compiler-dev/shell.nix

diff --git a/flake.nix b/flake.nix
index eecee7e..3b30b06 100644
--- a/flake.nix
+++ b/flake.nix
@@ -41,5 +41,11 @@
       overlays.default = final: prev: {
         zigpkgs = outputs.packages.${prev.system};
       };
+
+      # Templates for use with zig flake init
+      templates.compiler-dev = {
+        path = ./templates/compiler-dev;
+        description = "A development environment for Zig compiler development.";
+      };
     };
 }
diff --git a/templates/compiler-dev/.envrc b/templates/compiler-dev/.envrc
new file mode 100644
index 0000000..9384ad6
--- /dev/null
+++ b/templates/compiler-dev/.envrc
@@ -0,0 +1,4 @@
+# use nix shell if nix is available
+if has nix; then
+  use nix
+fi
diff --git a/templates/compiler-dev/flake.lock b/templates/compiler-dev/flake.lock
new file mode 100644
index 0000000..b00ec3d
--- /dev/null
+++ b/templates/compiler-dev/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1661239106,
+        "narHash": "sha256-C5OCLnrv2c4CHs9DMEtYKkjJmGL7ySAZ1PqPkHBonxQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "963d27a0767422be9b8686a8493dcade6acee992",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/templates/compiler-dev/flake.nix b/templates/compiler-dev/flake.nix
new file mode 100644
index 0000000..d48fe65
--- /dev/null
+++ b/templates/compiler-dev/flake.nix
@@ -0,0 +1,39 @@
+{
+  description = "Zig compiler development.";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    # Used for shell.nix
+    flake-compat = { url = github:edolstra/flake-compat; flake = false; };
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs  = import nixpkgs { inherit system; };
+      in {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            cmake
+            gdb
+            libxml2
+            ninja
+            qemu
+            wasmtime
+            zlib
+          ] ++ (with llvmPackages_14; [
+            clang
+            clang-unwrapped
+            lld
+            llvm
+          ]);
+
+          hardeningDisable = [ "all" ];
+        };
+
+        # For compatibility with older versions of the `nix` binary
+        devShell = self.devShells.${system}.default;
+      }
+  );
+}
diff --git a/templates/compiler-dev/shell.nix b/templates/compiler-dev/shell.nix
new file mode 100644
index 0000000..7e231b7
--- /dev/null
+++ b/templates/compiler-dev/shell.nix
@@ -0,0 +1,9 @@
+(import
+  (
+    let flake-compat = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat; in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${flake-compat.locked.rev}.tar.gz";
+      sha256 = flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }).shellNix