Fix DMG titles > 27 chars (LMMS#5741)

Workaround upstream bug LinusU/node-appdmg#48

Author: tresf

cmake/apple/CMakeLists.txt

@@ -9,6 +9,11 @@ SET(MACOSX_BUNDLE_MIMETYPE              "application/x-lmms-project")
 SET(MACOSX_BUNDLE_MIMETYPE_ICON         "project.icns")
 SET(MACOSX_BUNDLE_MIMETYPE_ID           "io.lmms")
 SET(MACOSX_BUNDLE_PROJECT_URL           "${PROJECT_URL}")
+SET(MACOSX_BUNDLE_DMG_TITLE             "${MACOSX_BUNDLE_BUNDLE_NAME} ${MACOSX_BUNDLE_LONG_VERSION_STRING}")
+
+# FIXME: appdmg won't allow volume names > 27 char
+# See also https://github.com/LinusU/node-appdmg/issues/48
+STRING(SUBSTRING "${MACOSX_BUNDLE_DMG_TITLE}" 0 27 MACOSX_BUNDLE_DMG_TITLE)
 
 CONFIGURE_FILE("lmms.plist.in"          "${CMAKE_BINARY_DIR}/Info.plist")
 CONFIGURE_FILE("install_apple.sh.in"    "${CMAKE_BINARY_DIR}/install_apple.sh" @ONLY)

cmake/apple/package_apple.json.in

@@ -1,5 +1,5 @@
 {
- "title": "@MACOSX_BUNDLE_BUNDLE_NAME@ @MACOSX_BUNDLE_LONG_VERSION_STRING@",
+ "title": "@MACOSX_BUNDLE_DMG_TITLE@",
  "background": "@CMAKE_SOURCE_DIR@/cmake/apple/dmg_branding.png",
  "icon-size": 128,
  "contents": [