Replace std::strong_ordering with auto return type to not require <compare>

.cirrus.yml

@@ -34,7 +34,7 @@ linux_task:
 
 macos_task:
     macos_instance:
-        image: ventura-base
+        image: ghcr.io/cirruslabs/macos-ventura-base:latest
     matrix:
         - name: macos_clang
           clang_script: brew install llvm@11

src/buffer.hh

@@ -68,7 +68,7 @@ public:
     BufferIterator(const Buffer& buffer, BufferCoord coord) noexcept;
 
     bool operator== (const BufferIterator& iterator) const noexcept;
-    std::strong_ordering operator<=>(const BufferIterator& iterator) const noexcept;
+    auto operator<=>(const BufferIterator& iterator) const noexcept;
     bool operator== (const BufferCoord& coord) const noexcept;
 
     const char& operator* () const noexcept;

src/buffer.inl.hh

@@ -108,7 +108,7 @@ inline bool BufferIterator::operator==(const BufferIterator& iterator) const noe
     return m_coord == iterator.m_coord;
 }
 
-inline std::strong_ordering BufferIterator::operator<=>(const BufferIterator& iterator) const noexcept
+inline auto BufferIterator::operator<=>(const BufferIterator& iterator) const noexcept
 {
     kak_assert(m_buffer == iterator.m_buffer);
     return (m_coord <=> iterator.m_coord);

src/keys.hh

@@ -85,7 +85,7 @@ struct Key
     constexpr uint64_t val() const { return (uint64_t)modifiers << 32 | key; }
 
     constexpr bool operator==(Key other) const { return val() == other.val(); }
-    constexpr std::strong_ordering operator<=>(Key other) const { return val() <=> other.val(); }
+    constexpr auto operator<=>(Key other) const { return val() <=> other.val(); }
 
     constexpr DisplayCoord coord() const { return {(int)((key & 0xFFFF0000) >> 16), (int)(key & 0x0000FFFF)}; }
     constexpr MouseButton mouse_button() { return MouseButton{((int)modifiers & (int)Modifiers::MouseButtonMask) >> 6}; }

src/main.cc

@@ -1092,8 +1092,7 @@ int main(int argc, char* argv[])
 
     try
     {
-        auto show_usage = [&]()
+        auto show_usage = [&]() {
-        {
             write_stdout(format("Usage: {} [options] [file]... [+<line>[:<col>]|+:]\n\n"
                     "Options:\n"
                     "{}\n"