From 7fb87fbb961fc2a082392aa90bb818ae82769670 Mon Sep 17 00:00:00 2001
From: Gregor Lohaus <lohausgregor@gmail.com>
Date: Wed, 7 Oct 2026 13:00:58 +0200
Subject: [PATCH] run on ios

---
 index.ts                                      | 22 ++++++++++++++++--
 .../app.json"                                 |  5 ++--
 template/devenv.nix                           | 23 +++++++++++++++++++
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/index.ts b/index.ts
index 2703dd2..8613f3d 100644
--- a/index.ts
+++ b/index.ts
@@ -37,6 +37,22 @@ const project = await p.group(
         ]
       })
     ,
+    bundleid: async ({ results }) => {
+      if (results.mobile !== "expo") return ""
+      // Valid as both an iOS bundle identifier and an Android package name.
+      const fallback = `com.${String(results.name).toLowerCase().replace(/[^a-z0-9]/g, "").replace(/^[0-9]+/, "") || "app"}.mobile`
+      return await p.text({
+        message: "What bundle identifier should the mobile app use?",
+        placeholder: fallback,
+        defaultValue: fallback,
+        validate: (value) => {
+          if (value && !/^[a-zA-Z][a-zA-Z0-9]*(\.[a-zA-Z][a-zA-Z0-9]*)+$/.test(value)) {
+            return "Use reverse-DNS segments of letters and digits, e.g. com.example.app"
+          }
+          return undefined
+        },
+      })
+    },
     goprefix: () =>
       p.text({
         message: "What would you like to use as a go package prefix?",
@@ -65,11 +81,13 @@ const render = createRenderer(z.object({
     name: z.string(),
     goprefix: z.string(),
     frontend: z.string(),
-    mobile: z.string()
+    mobile: z.string(),
+    bundleid: z.string()
   })
 }))
 const destDir = path.join("./", project.name);
-render(destDir, { project }, { reverseMap: true })
+// `results` in the bundleid prompt makes group() infer it as unknown.
+render(destDir, { project: { ...project, bundleid: project.bundleid as string } }, { reverseMap: true })
 
 const s = p.spinner();
 if (project.installDeps) {
diff --git "a/template/apps/<@if(eq(context.project.mobile,\"expo\"))>mobile/app.json" "b/template/apps/<@if(eq(context.project.mobile,\"expo\"))>mobile/app.json"
index f83a317..442c385 100644
--- "a/template/apps/<@if(eq(context.project.mobile,\"expo\"))>mobile/app.json"
+++ "b/template/apps/<@if(eq(context.project.mobile,\"expo\"))>mobile/app.json"
@@ -8,7 +8,8 @@
     "scheme": "mobile",
     "userInterfaceStyle": "automatic",
     "ios": {
-      "icon": "./assets/expo.icon"
+      "icon": "./assets/expo.icon",
+      "bundleIdentifier": "<@var(context.project.bundleid)>"
     },
     "android": {
       "adaptiveIcon": {
@@ -18,7 +19,7 @@
         "monochromeImage": "./assets/images/android-icon-monochrome.png"
       },
       "predictiveBackGestureEnabled": false,
-      "package": "com.gregorl.mobile"
+      "package": "<@var(context.project.bundleid)>"
     },
     "web": {
       "output": "static",
diff --git a/template/devenv.nix b/template/devenv.nix
index 3440424..39ff279 100644
--- a/template/devenv.nix
+++ b/template/devenv.nix
@@ -40,6 +40,23 @@
       echo no | avdmanager create avd -n "Pixel_5_API34" -k "system-images;android-34;google_apis_playstore;${if pkgs.stdenv.hostPlatform.isAarch64 then "arm64-v8a" else "x86_64"}" -d "pixel_5"
     fi
   '';
+  # macOS only: run on the iOS simulator when Xcode with a simulator is installed.
+  scripts.run-ios = lib.mkIf pkgs.stdenv.isDarwin {
+    exec = ''
+      # devenv points DEVELOPER_DIR at the Nix SDK, which xcode-select would echo back.
+      dev_dir="$(/usr/bin/env -u DEVELOPER_DIR /usr/bin/xcode-select -p 2>/dev/null)"
+      [ -x "$dev_dir/usr/bin/simctl" ] || dev_dir=/Applications/Xcode.app/Contents/Developer
+      if ! DEVELOPER_DIR="$dev_dir" /usr/bin/xcrun simctl list devices available 2>/dev/null | grep -q iPhone; then
+        echo "No Xcode iOS simulator found, skipping iOS."
+        exit 0
+      fi
+      # devenv's Nix Apple SDK, xcrun and compiler wrappers break xcodebuild, so build in a clean env.
+      exec /usr/bin/env -i HOME="$HOME" USER="$USER" TERM="$TERM" LANG=en_US.UTF-8 \
+        DEVELOPER_DIR="$dev_dir" \
+        PATH="${lib.makeBinPath [ pkgs.bun pkgs.nodejs_24 pkgs.cocoapods ]}:/usr/bin:/bin:/usr/sbin:/sbin" \
+        bunx expo run:ios --no-bundler "$@"
+    '';
+  };
  <@endif>
   languages.go.enable = true;
   languages.typescript.enable = true;
@@ -100,6 +117,12 @@
         on = "always";
       };
     };
+    # Reuses the Metro bundler started by expodev.
+    expoios = lib.mkIf pkgs.stdenv.isDarwin {
+      exec = "run-ios";
+      cwd = "./apps/mobile";
+      after = ["devenv:processes:expodev@started"];
+    };
     <@endif>
     sqlwatcher = {
       exec = "sqlc generate";