From 3eac27984266416a1a75622b6474ac137eb73002 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 04:56:18 +0000
Subject: [PATCH 1/4] Initial plan


From f0f0f9a6eac929528c1271714868730643f9974f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 05:05:48 +0000
Subject: [PATCH 2/4] Update flake.nix for macOS 26 and add GitHub Actions
 build workflow

Co-authored-by: koalazub <7111524+koalazub@users.noreply.github.com>
---
 .github/workflows/build_publish.yml | 32 +++++++++++++++++++++++++++++
 flake.nix                           | 17 +++++++++++----
 2 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/build_publish.yml b/.github/workflows/build_publish.yml
index 8b13789..8f2ab1e 100644
--- a/.github/workflows/build_publish.yml
+++ b/.github/workflows/build_publish.yml
@@ -1 +1,33 @@
+name: Build and Test
 
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: macos-15
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Show Swift version
+        run: |
+          swift --version
+          xcodebuild -version
+
+      - name: Build with swiftc
+        run: |
+          xcrun swiftc -o WhoseDefaultBrowser main.swift
+
+      - name: Verify binary exists
+        run: |
+          test -f WhoseDefaultBrowser && echo "Build successful!" || exit 1
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: WhoseDefaultBrowser
+          path: WhoseDefaultBrowser
diff --git a/flake.nix b/flake.nix
index 4ae1a3d..387b05d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -31,10 +31,19 @@
             };
             buildInputs = [ pkgs.darwin.apple_sdk.frameworks.CoreServices ];
             buildPhase = ''
-              export PATH=$PATH:/usr/bin:/usr/local/bin
-              export SDKROOT=$(xcrun --show-sdk-path)
-              export MACOSX_DEPLOYMENT_TARGET=10.15
-              xcrun swiftc -o WhoseDefaultBrowser main.swift
+              export PATH="/usr/bin:/usr/local/bin:$PATH"
+
+              # Use the latest SDK and Swift from the system's Xcode
+              export SDKROOT=$(/usr/bin/xcrun --sdk macosx --show-sdk-path)
+              export DEVELOPER_DIR=$(/usr/bin/xcode-select -p)
+              export MACOSX_DEPLOYMENT_TARGET=15.0
+
+              # Use xcodebuild for compilation (compatible with macOS 26+ Xcode)
+              /usr/bin/xcrun --sdk macosx swiftc \
+                -o WhoseDefaultBrowser \
+                -sdk "$SDKROOT" \
+                -target ${if system == "aarch64-darwin" then "arm64" else "x86_64"}-apple-macosx15.0 \
+                main.swift
             '';
             installPhase = ''
               mkdir -p $out/bin

From 45721f809aaeb2ffbf7916c38f5f29b98a282d7e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 05:11:24 +0000
Subject: [PATCH 3/4] Add explicit permissions to GitHub Actions workflow

Co-authored-by: koalazub <7111524+koalazub@users.noreply.github.com>
---
 .github/workflows/build_publish.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.github/workflows/build_publish.yml b/.github/workflows/build_publish.yml
index 8f2ab1e..d6dedb4 100644
--- a/.github/workflows/build_publish.yml
+++ b/.github/workflows/build_publish.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: macos-15

From 9c6a2b8db7df2be2e4b8ab9ccded65e647fa93a6 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 12:09:43 +0000
Subject: [PATCH 4/4] Use nix build in GitHub Actions instead of direct swiftc
 commands

Co-authored-by: koalazub <7111524+koalazub@users.noreply.github.com>
---
 .github/workflows/build_publish.yml | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/build_publish.yml b/.github/workflows/build_publish.yml
index d6dedb4..f227a63 100644
--- a/.github/workflows/build_publish.yml
+++ b/.github/workflows/build_publish.yml
@@ -16,21 +16,24 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
       - name: Show Swift version
         run: |
           swift --version
           xcodebuild -version
 
-      - name: Build with swiftc
+      - name: Build with Nix
         run: |
-          xcrun swiftc -o WhoseDefaultBrowser main.swift
+          nix build .#default --print-build-logs
 
       - name: Verify binary exists
         run: |
-          test -f WhoseDefaultBrowser && echo "Build successful!" || exit 1
+          test -f result/bin/WhoseDefaultBrowser && echo "Build successful!" || exit 1
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
           name: WhoseDefaultBrowser
-          path: WhoseDefaultBrowser
+          path: result/bin/WhoseDefaultBrowser