Copy over the rust tools and start on flake.nix

Mononix/.obsidian/workspace.json

@@ -33,19 +33,6 @@
               }
             }
           },
-          {
-            "id": "4d0f931be6c172b5",
-            "type": "leaf",
-            "state": {
-              "type": "markdown",
-              "state": {
-                "file": "Nix For Development.md",
-                "mode": "source",
-                "backlinks": true,
-                "source": false
-              }
-            }
-          },
           {
             "id": "bd24ffd92b4cc242",
             "type": "leaf",
@@ -192,11 +179,11 @@
   "active": "f8131571839b6055",
   "lastOpenFiles": [
     "Nix For Development.md",
+    "cargo2nix.md",
     "Index.md",
     "Nix Monorepos.md",
     "Rust build tools in Nix.md",
     "Nix should immediately make a person's time better.md",
-    "cargo2nix.md",
     "Nix Flakes.md",
     "buildRustPackage.md",
     "buildRustCrate.md",

flake.nix

@@ -0,0 +1,16 @@
+{
+  description = "Monorepo build tools for Nix";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs, ... }:
+    rust-tools = import ./rust-tools.nix {
+      inherit (pkgs.stdenv) mkDerivation;
+    };
+  in
+  {
+    rust-tools = rust-tools;
+  };
+}

rust-tools.nix

@@ -0,0 +1,44 @@
+{ mkDerivation,
+  rust,
+  system,
+  target ? system,
+}:
+let
+  normalizeCrateName = name: builtins.replaceStrings ["-"] ["_"] name;
+
+  mkDeps = path: crates:
+    builtins.concatStringsSep " " ["-L ${path} " (builtins.concatStringsSep " " (builtins.map (crate: "--extern ${crate}") crates))];
+
+  rust-system = if system == "x86_64-linux" then "x86_64-unknown-linux-gnu" else system;
+in {
+  buildRustLib = { name, src }:
+    let
+      stdDeps = mkDeps "${rust.rust-std}/lib/rustlib/${rust-system}/lib" [ "std" "core" ];
+    in mkDerivation {
+      name = name;
+      src = src;
+
+      dontUnpack = true;
+      buildPhase = ''
+        mkdir -p $out/lib
+        ${rust.rustc}/bin/rustc -o $out/lib/lib${name}.rlib ${stdDeps} --crate-type lib ${src}/src/lib.rs
+        '';
+    };
+
+  buildRustApp = { name, src, buildDependencies }:
+    let
+      stdDeps = mkDeps "${rust.rust-std}/lib/rustlib/${rust-system}/lib" [ "std" "core" ];
+      rustDeps = builtins.concatStringsSep " " (builtins.map (dep: "--extern ${normalizeCrateName dep.name}=${dep.out}/lib/lib${dep.name}.rlib") buildDependencies);
+    in mkDerivation {
+    name = name;
+    src = src;
+
+    dontUnpack = true;
+
+    buildPhase = ''
+      mkdir -p $out/bin
+      ${rust.rustc}/bin/rustc -o $out/bin/${name} ${stdDeps} ${rustDeps} ${src}/src/main.rs
+      '';
+  };
+}
+