Add support for building organic via nix.

flake.nix

@@ -0,0 +1,139 @@
+{
+  description = "Organic Org parser";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      rust-overlay,
+    }:
+    let
+      forAllSystems =
+        func:
+        builtins.listToAttrs (
+          map (system: {
+            name = system;
+            value = func system;
+          }) nixpkgs.lib.systems.flakeExposed
+        );
+    in
+    {
+      devShells = forAllSystems (
+        system:
+        let
+          overlays = [ (import rust-overlay) ];
+          pkgs = import nixpkgs {
+            inherit system overlays;
+          };
+          rustToolchain =
+            (pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml).override
+              { targets = [ "wasm32-unknown-unknown" ]; };
+        in
+        {
+          default = pkgs.mkShell {
+            nativeBuildInputs = [
+              rustToolchain
+            ];
+            buildInputs = with pkgs; [
+              wasm-bindgen-cli
+            ];
+          };
+        }
+      );
+      packages = forAllSystems (
+        system:
+        let
+          overlays = [ (import rust-overlay) ];
+          pkgs = import nixpkgs {
+            inherit system overlays;
+          };
+          build_wasm =
+            {
+              bindgenTarget ? null,
+            }:
+            (pkgs.callPackage ./nix/package.nix {
+              targetBins = [
+                "wasm"
+              ];
+              features = [ "wasm" ];
+              cargoBuildTarget = "wasm32-unknown-unknown";
+              buildType = "wasm";
+            }).overrideAttrs
+              (
+                old:
+                let
+                  bindgen_command = [
+                    "${pkgs.wasm-bindgen-cli}/bin/wasm-bindgen"
+                    "--target"
+                    bindgenTarget
+                    "--out-dir"
+                    "target/wasm32-unknown-unknown/${bindgenTarget}"
+                    "target/wasm32-unknown-unknown/wasm/wasm.wasm"
+                  ];
+                in
+                {
+                  postBuild = ''
+                    ${pkgs.lib.escapeShellArgs bindgen_command}
+                  '';
+
+                  installPhase = ''
+                    mkdir -p $out/share/${bindgenTarget}
+                    cp target/wasm32-unknown-unknown/${bindgenTarget}/* $out/share/${bindgenTarget}
+                  '';
+                }
+              );
+        in
+        rec {
+          all = pkgs.symlinkJoin {
+            name = "all";
+            paths = [
+              library
+              devTools
+              wasm_bundler
+              wasm_web
+            ];
+          };
+          library = (pkgs.callPackage ./nix/package.nix { buildLib = true; }).overrideAttrs (
+            old:
+            let
+            in
+            {
+              installPhase = ''
+                mkdir -p $out/lib
+                cp target/*/release/liborganic.rlib $out/lib/
+              '';
+            }
+          );
+          devTools = pkgs.callPackage ./nix/package.nix {
+            targetBins = [
+              "parse"
+              "compare"
+            ];
+            features = [ "compare" ];
+          };
+          wasm_bundler = build_wasm { bindgenTarget = "bundler"; };
+          wasm_web = build_wasm { bindgenTarget = "web"; };
+          docker_env = pkgs.buildEnv {
+            name = "organic";
+            paths = with pkgs; [
+              devTools
+              bash
+              uutils-coreutils-noprefix
+              # toybox # Smaller than uutils-coreutils?
+            ];
+          };
+          default = all;
+        }
+      );
+    };
+}