Improve macOS DMG drag installation

cmake/acecode_desktop.cmake

@@ -104,10 +104,30 @@ endif()
 
 if(APPLE)
     set(ACECODE_MACOS_ICON "${CMAKE_SOURCE_DIR}/assets/macos/acecode.icns")
+    set(ACECODE_MACOS_INSTALLER_ICON_SOURCE
+        "${CMAKE_SOURCE_DIR}/assets/macos/acecode-installer.svg")
+    set(ACECODE_MACOS_INSTALLER_ICON
+        "${CMAKE_BINARY_DIR}/generated/macos/acecode-installer.icns")
+    add_custom_command(
+        OUTPUT "${ACECODE_MACOS_INSTALLER_ICON}"
+        COMMAND /bin/bash
+            "${CMAKE_SOURCE_DIR}/scripts/macos_generate_icns.sh"
+            --source "${ACECODE_MACOS_INSTALLER_ICON_SOURCE}"
+            --output "${ACECODE_MACOS_INSTALLER_ICON}"
+        DEPENDS
+            "${ACECODE_MACOS_INSTALLER_ICON_SOURCE}"
+            "${CMAKE_SOURCE_DIR}/scripts/macos_generate_icns.sh"
+        COMMENT "Generating ACECode current-user installer icon"
+        VERBATIM
+    )
     target_sources(acecode-desktop PRIVATE "${ACECODE_MACOS_ICON}")
     set_source_files_properties("${ACECODE_MACOS_ICON}" PROPERTIES
         MACOSX_PACKAGE_LOCATION "Resources"
     )
+    set_source_files_properties("${ACECODE_MACOS_INSTALLER_ICON}" PROPERTIES
+        GENERATED TRUE
+        MACOSX_PACKAGE_LOCATION "Resources"
+    )
     set_target_properties(acecode-desktop PROPERTIES
         # Keep the app bundle user-facing while avoiding a case-insensitive
         # collision with the bundled daemon binary copied below.
@@ -141,7 +161,7 @@ if(APPLE)
         ${CMAKE_SOURCE_DIR}/src/macos_installer/main.mm
         ${CMAKE_SOURCE_DIR}/src/desktop/user_install_policy.cpp
         ${CMAKE_SOURCE_DIR}/src/desktop/user_install_policy.hpp
-        ${ACECODE_MACOS_ICON}
+        ${ACECODE_MACOS_INSTALLER_ICON}
     )
     target_include_directories(acecode-user-installer PRIVATE
         ${CMAKE_SOURCE_DIR}/src
@@ -153,7 +173,7 @@ if(APPLE)
     set_target_properties(acecode-user-installer PROPERTIES
         RUNTIME_OUTPUT_NAME "Install ACECode"
         MACOSX_BUNDLE_BUNDLE_NAME "Install ACECode"
-        MACOSX_BUNDLE_ICON_FILE "acecode.icns"
+        MACOSX_BUNDLE_ICON_FILE "acecode-installer.icns"
         MACOSX_BUNDLE_GUI_IDENTIFIER "dev.acecode.installer"
         MACOSX_BUNDLE_INFO_PLIST
             "${CMAKE_SOURCE_DIR}/cmake/macos/ACECodeUserInstallerInfo.plist.in"

cmake/macos/ACECodeUserInstallerInfo.plist.in

@@ -5,6 +5,25 @@
 <dict>
   <key>CFBundleDevelopmentRegion</key>
   <string>en</string>
+  <key>CFBundleDocumentTypes</key>
+  <array>
+    <dict>
+      <key>CFBundleTypeExtensions</key>
+      <array>
+        <string>app</string>
+      </array>
+      <key>CFBundleTypeName</key>
+      <string>ACECode Application Bundle</string>
+      <key>CFBundleTypeRole</key>
+      <string>Viewer</string>
+      <key>LSHandlerRank</key>
+      <string>Alternate</string>
+      <key>LSItemContentTypes</key>
+      <array>
+        <string>com.apple.application-bundle</string>
+      </array>
+    </dict>
+  </array>
   <key>CFBundleDisplayName</key>
   <string>${MACOSX_BUNDLE_BUNDLE_NAME}</string>
   <key>CFBundleExecutable</key>