From e061d32b3b9352253125e5a5e6bf33c9f7f30987 Mon Sep 17 00:00:00 2001
From: david <davidcrompton@duck.com>
Date: Sat, 6 Apr 2024 14:59:28 -0400
Subject: [PATCH] Update C Flake, Meson wrap fetch, cleaner deps

---
 flakes/c/flake.nix         | 124 ++++++++++++++++++-------------------
 flakes/c/mesonWrapFetch.py |  22 +++++++
 2 files changed, 84 insertions(+), 62 deletions(-)
 create mode 100644 flakes/c/mesonWrapFetch.py

diff --git a/flakes/c/flake.nix b/flakes/c/flake.nix
index f99899e..755d158 100644
--- a/flakes/c/flake.nix
+++ b/flakes/c/flake.nix
@@ -1,90 +1,90 @@
 {
-  description = "Syzygui - Cross Platform Vulkan Based GUI Framework";
+  description = "C Project Flake";
 
   inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system: let
       version = "0.0.1";
 
-      name = "PACKAGE";
+      name = "cproj";
       
       pkgs = import nixpkgs {
         inherit system;
       };
 
-      deps = (with pkgs; [
-      ]);
+      pkgs-windows = pkgs.pkgsCross.mingwW64;
+
+      # For Linux Specific Dependencies
+      linux' = pkgs.lib.optional pkgs.stdenv.isLinux;
+      # For MacOS Specific Dependencies
+      darwin' = pkgs.lib.optional pkgs.stdenv.isDarwin;
+
+      nativeBuildInputs = with pkgs; [
+        meson
+        ninja
+        pkg-config
+      ];      
+
+      bDeps = p: with p; [
+      ] ++ (linux' [
+      ]) ++ (darwin' ([
+      ] ++ (with darwin.apple_sdk.frameworks; [
+      ])));
       
-      propDeps = (with pkgs; [
+      pbDeps = p: with p; [
+      ];
 
-      ]) ++ (pkgs.lib.optionals pkgs.stdenv.isDarwin (with pkgs; [
-      ]));
-
-      project = pkgs.stdenv.mkDerivation {
+      sharedEnv = let
+        mesonWrapCache = let
+          mesonPy = pkgs.python3.withPackages (p: [p.meson]); 
+        in import (pkgs.runCommand "meson-wrap-${name}-${version}" {} ''
+          ${mesonPy}/bin/${mesonPy.executable} ${./mesonWrapFetch.py} ${./.} > $out
+        '') { inherit pkgs; };
+      in  {
         pname = name;
         inherit version;
-        src = ./.;
-
-        nativeBuildInputs = with pkgs; [
-          meson
-          ninja
-          pkg-config
-        ];
-
-        buildInputs = deps ++ (with pkgs; [
-        ]);
-
-        propagatedBuildInputs = propDeps ++ (with pkgs; [
-        ]);
-      };
-
-      # Pseudo Dev for Not Rebuilding During Development
-      project-dev = pkgs.stdenv.mkDerivation {
-        name = "${name}-dev";
-        src = ./include;
-        installPhase = ''
-          mkdir -p $out/include
-          cp -r * $out/include
+        src = self;
+        
+        inherit nativeBuildInputs;
+        
+        preConfigure = ''
+          mkdir subprojects/packagecache
+          ${builtins.concatStringsSep ";" (builtins.attrValues (builtins.mapAttrs (n: v: "cp ${v} subprojects/packagecache/${n}") mesonWrapCache))}
         '';
       };
 
-      project-examples = pkgs.stdenv.mkDerivation {
-        pname = "${name}-examples";
-        inherit version;
-        src = ./examples;
-        
-        nativeBuildInputs = with pkgs; [
-          meson
-          ninja
-          pkg-config
-        ];
+      cproj = pkgs.stdenv.mkDerivation (sharedEnv // {
+        buildInputs = bDeps pkgs;
+        propagatedBuildInputs = pbDeps pkgs;
+      });
 
-        buildInputs = deps ++ (with pkgs; [
-          "${name}"
-        ]);
+      cproj-exe = pkgs-windows.stdenv.mkDerivation ( sharedEnv // {        
+        buildInputs = bDeps pkgs-windows;
+        propagatedBuildInputs = pbDeps pkgs-windows;
+      });
+    in {
+      packages = {
+        default = cproj;
+        inherit cproj cproj-exe;
+
+        Cproj = mkImage "latest";
+        Cproj-Test = mkImage "dev";
       };
       
-    in {
-        packages = {
-          default = project;
-          examples = if (builtins.pathExists ./examples) then project-examples else pkgs.writeText "No Examples" ''
-            No "examples" in root directory, make an examples dir for examples.
-          '';
-        };
-        apps = rec {
-          default = flake-utils.lib.mkApp { drv = self.packages.${system}.default; };
-        };
+      apps = rec {
+        default = flake-utils.lib.mkApp { drv = self.packages.${system}.default; };
+      };
 
-        devShells.default = pkgs.mkShell {
-          C_INCLUDE_PATH = "./include";
-          packages = deps ++ propDeps ++ (with pkgs; [
-            project-dev
-            
+      devShells = {
+        default = pkgs.mkShell {
+          inputsFrom = [ cproj ];
+          packages = (with pkgs; [
             clang-tools
-            meson
           ]);
         };
-      }
-    );
+        inherit cproj;
+      };
+    });
 }
diff --git a/flakes/c/mesonWrapFetch.py b/flakes/c/mesonWrapFetch.py
new file mode 100644
index 0000000..40cf571
--- /dev/null
+++ b/flakes/c/mesonWrapFetch.py
@@ -0,0 +1,22 @@
+from glob import glob
+from mesonbuild.wrap.wrap import PackageDefinition
+import sys
+
+print("{ pkgs, ... }: {")
+
+for wrap in glob(f"{sys.argv[1]}/subprojects/*.wrap"):
+    wrap = PackageDefinition(wrap)
+
+    if wrap.wrap_section == "wrap-file":
+        print(f"""  "{wrap.values['source_filename']}" = pkgs.fetchurl {{
+    url = "{wrap.values['source_url']}";
+    sha256 = "{wrap.values['source_hash']}";
+  }};""")
+
+    if 'patch_url' in wrap.values:
+        print(f"""  "{wrap.values['patch_filename']}" = pkgs.fetchurl {{
+    url = "{wrap.values['patch_url']}";
+    sha256 = "{wrap.values['patch_hash']}";
+  }};""")
+
+print("}")