Add default.nix for nix builds on MacOS

Author: tyler-dodge

default.nix

@@ -0,0 +1,120 @@
+let pkgs = import <nixpkgs> {};
+
+    thread-list = list: start: pkgs.lib.lists.foldl (acc: item: (item acc)) start list;
+
+    sdk_root = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk;
+
+    xcrun_path = /usr/bin/xcrun;
+
+    make_impure_sdk = with pkgs; { lib_path ? null, include_path ? null,  framework_path, }:
+            let lib_command = pkgs.lib.strings.concatStrings (pkgs.lib.optional (lib_path != null) ''
+if ! [ -x ${lib_path} ]; then
+  echo Cannot find command ${lib_path}
+  exit 1
+fi
+ln -s ${lib_path} $out/lib
+'');
+
+                include_command = pkgs.lib.strings.concatStrings (pkgs.lib.optional (lib_path != null) ''
+if ! [ -x ${include_path} ]; then
+  echo Cannot find command ${include_path}
+  exit 1
+fi
+ln -s ${include_path} $out/include
+'');
+
+                script = ''
+mkdir -p $out/Library/
+
+${lib_command}
+${include_command}
+if ! [ -x ${framework_path} ]; then
+  echo Cannot find command ${framework_path}
+  exit 1
+fi
+ln -s ${framework_path} $out/Library/Frameworks
+'';
+            in runCommandLocal "apple-sdk--impure-darwin" {
+                    __impureHostDeps = [lib_path framework_path framework_path];
+                    meta = {
+                            platforms = lib.platforms.darwin;
+                    };
+            } script;
+
+    mkImpureDrv = with pkgs; name: path:
+            let script = ''
+if ! [ -x ${path} ]; then
+  echo Cannot find command ${path}
+  exit 1
+fi
+
+mkdir -p $out/bin
+ln -s ${path} $out/bin/${name}
+'';
+            in runCommandLocal "${name}-impure-darwin" {
+                    __impureHostDeps = [ path ];
+                    meta = {
+                            platforms = lib.platforms.darwin;
+                    };
+            } script;
+
+    impure_apple_sdk = make_impure_sdk {
+            lib_path = sdk_root + "/usr/lib";
+            include_path = sdk_root  + "/usr/include";
+            framework_path = sdk_root + "/System/Library/Frameworks";
+    };
+
+    filter_apple_sdk = thread-list [
+            (pkgs.lib.lists.filter (it: it != null))
+            (pkgs.lib.lists.filter (it: !(pkgs.lib.strings.hasInfix "apple-framework" it.name)))
+            (pkgs.lib.lists.filter (it: !(pkgs.lib.strings.hasInfix "clang-wrapper" it.name)))
+    ];
+
+    extra_inputs = [
+            pkgs.clang_15
+            pkgs.tree-sitter
+            pkgs.giflib
+            (mkImpureDrv "xcrun" xcrun_path)
+            impure_apple_sdk
+            pkgs.source-code-pro
+            pkgs.libjpeg
+            pkgs.libtiff
+            pkgs.lcms2
+    ];
+in
+with pkgs; emacs.overrideAttrs (prevAttrs: {
+        version = "29";
+
+        SDKROOT = impure_apple_sdk;
+
+        CC = pkgs.clang_15;
+
+        preConfigure = ''
+# Manually overriding to get access to newer features and the nix version mismatches
+# the host.
+export MACOSX_DEPLOYMENT_TARGET="12.0"
+'';
+
+        patches = (prevAttrs.patches) ++ [
+                (pkgs.fetchpatch {
+                        url = "https://raw.githubusercontent.com/d12frosted/homebrew-emacs-plus/master/patches/emacs-28/fix-window-role.patch";
+                        hash = "sha256-+z/KfsBm1lvZTZNiMbxzXQGRTjkCFO4QPlEK35upjsE=";
+                })
+                (pkgs.fetchpatch {
+                        url = "https://raw.githubusercontent.com/d12frosted/homebrew-emacs-plus/master/patches/emacs-28/system-appearance.patch";
+                        hash = "sha256-oM6fXdXCWVcBnNrzXmF0ZMdp8j0pzkLE66WteeCutv8=";
+                })
+        ];
+
+        configureFlags = prevAttrs.configureFlags ++ [
+                "--with-ns"
+                "--without-libgmp"
+                "--with-tree-sitter"
+        ];
+
+        buildInputs = (filter_apple_sdk prevAttrs.buildInputs) ++ extra_inputs;
+
+        nativeBuildInputs = (filter_apple_sdk prevAttrs.nativeBuildInputs) ++ extra_inputs;
+
+        src = ./.;
+})

runbook.org

@@ -0,0 +1,8 @@
+* Nix Build :PTY:
+#+BEGIN_SRC compile-queue
+set -o errexit
+set -o pipefail
+set -o nounset
+cd {{project_root}}
+nix-build --show-trace
+#+END_SRC