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fix(doctor): detect missing Swift macro plugins on CLT-only hosts (#174) #414

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fix(doctor): detect missing Swift macro plugins on CLT-only hosts (#174) #414

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6 changes: 5 additions & 1 deletion README.md
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Expand Up @@ -94,7 +94,11 @@ another Mac or redistributed.
### Source-build requirements

- macOS 26 or later
- Xcode 26, or matching Command Line Tools with the macOS 26 SDK
- Xcode 26 — full `Xcode.app`, not Command Line Tools alone. RepoPrompt CE and
its dependencies use the `@Entry` and `#Preview` Swift macros, whose plugins
(`SwiftUIMacros`, `PreviewsMacros`) ship only with `Xcode.app`. Its bundled
macOS 26 SDK satisfies the SDK requirement. Run `./Scripts/doctor.sh` to
verify your toolchain before building.

### Develop in Xcode

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22 changes: 22 additions & 0 deletions Scripts/doctor.sh
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Expand Up @@ -104,6 +104,28 @@ SWIFT
ARCH="$(uname -m)"
run xcrun swiftc -typecheck -parse-as-library -target "${ARCH}-apple-macos14.0" "$TMP/GlassProbe.swift"
log "OK: toolchain can compile SwiftUI Liquid Glass symbols."
phase "Compiling Swift macro plugin probe"
cat > "$TMP/MacroProbe.swift" <<'SWIFT'
import SwiftUI

// Mirrors real RepoPrompt CE usage: `@Entry` (SwiftUIMacros) in an
// EnvironmentValues extension, plus `#Preview` (PreviewsMacros) carried by
// dependencies such as KeyboardShortcuts. Both macro plugins ship only with
// full Xcode.app; Command Line Tools alone cannot expand them, so a typecheck
// (which runs macro expansion) is enough to detect their absence.
extension EnvironmentValues {
@Entry var repoPromptDoctorMacroProbe: Bool = false
}

#Preview("doctor macro probe") {
Text("OK")
}
SWIFT
if ! xcrun swiftc -typecheck -parse-as-library -target "${ARCH}-apple-macos14.0" "$TMP/MacroProbe.swift" 2>"$TMP/MacroProbe.err"; then
(( quiet )) || cat "$TMP/MacroProbe.err" >&2
fail "Swift macro plugins unavailable (SwiftUIMacros / PreviewsMacros). RepoPrompt CE uses the @Entry and #Preview macros, whose plugins ship only with full Xcode.app — Command Line Tools alone cannot build it. Install Xcode 26 and select it: sudo xcode-select -s /Applications/Xcode.app"
fi
log "OK: toolchain provides Swift macro plugins (@Entry, #Preview)."
if (( install_debug_cli )); then
phase "Installing debug CLI"
run "$ROOT_DIR/Scripts/install_debug_cli.sh" install --build
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