Qt Creator Plugin Wizard: Add custom target to run Qt Creator

This commit will add the CMake boilerplate code that will just allow the
resulted plugin project to "Run".

A custom CMake target named "RunQtCreator" will be created. The Qt
Creator executable referenced by the Qt Creator "Devel" package will be
used as command whth the '-pluginpath' of the newely created plugin.

Change-Id: I503a2bc5004ab2c890032e0af0cb1f4bbfcd4326
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

share/qtcreator/templates/wizards/qtcreatorplugin/CMakeLists.txt

@@ -55,3 +55,21 @@ add_qtc_plugin(%{PluginName}
     %{ConstantsHdrFileName}
     %{TrHdrFileName}
 )
+
+# Enable the Run button in Qt Creator
+get_target_property(QtCreatorCorePath QtCreator::Core LOCATION)
+find_program(QtCreatorExecutable
+  NAMES
+    qtcreator "Qt Creator"
+  PATHS
+    "${QtCreatorCorePath}/../../../bin"
+    "${QtCreatorCorePath}/../../../MacOS"
+  NO_DEFAULT_PATH
+)
+if (QtCreatorExecutable)
+  add_custom_target(RunQtCreator
+    COMMAND ${QtCreatorExecutable} -pluginpath $<TARGET_FILE_DIR:%{PluginName}>
+    DEPENDS %{PluginName}
+  )
+  set_target_properties(RunQtCreator PROPERTIES FOLDER "qtc_runnable")
+endif()

share/qtcreator/templates/wizards/qtcreatorplugin/README.md

@@ -14,7 +14,12 @@ relative or absolute path to this plugin directory.
 
 ## How to Run
 
-Run a compatible Qt Creator with the additional command line argument
+From the command line run
+
+    cmake --build . --target RunQtCreator
+
+`RunQtCreator` is a custom CMake target that will use the <path to qtcreator> referenced above to
+start the Qt Creator executable with the following parameters
 
     -pluginpath <path_to_plugin>
 
@@ -24,13 +29,3 @@ where `<path_to_plugin>` is the path to the resulting plugin library in the buil
 
 You might want to add `-temporarycleansettings` (or `-tcs`) to ensure that the opened Qt Creator
 instance cannot mess with your user-global Qt Creator settings.
-
-When building and running the plugin from Qt Creator, you can use
-
-    -pluginpath "%{buildDir}/lib/qtcreator/plugins" -tcs
-
-on Windows and Linux, or
-
-    -pluginpath "%{buildDir}/Qt Creator.app/Contents/PlugIns" -tcs
-
-for the `Command line arguments` field in the run settings.