Fix #1076 add more documentation on bash and bat script configuration (…

…#1077)

src/sphinx/archetypes/java_app/customize.rst

@@ -9,12 +9,53 @@ There are generally two types of configurations:
 * Configuring the JVM and the process
 * Configuring the application itself
 
-You have three options to define your runtime and application configurations.
+You have two options to define your runtime and application configurations.
+
+Configuration file
+^^^^^^^^^^^^^^^^^^
+
+The start scripts provided by the ``BatStartScriptPlugin`` and ``BashStartScriptPlugin`` can both load an external
+configuration file during execution. You can define the configuration file location for both with these two settings.
+
+
+  ``bashScriptConfigLocation``
+    The location of the bash script on the target system.
+
+    **Default** ``${app_home}/../conf/application.ini``
+
+  ``batScriptConfigLocation``
+    The location of the bat script on the target system.
+
+    **Default** ``%APP_HOME%\conf\application.ini``
+
+
+The configuration path is the path on the **target** system. This means that native-packager needs to process this path
+to create a valid ``universal:mapping``s entry.
+
+* ``${app_home}/../`` is removed
+* ``%APP_HOME%`` is removed and ``\`` is being replaced with ``/``
+
+This means you can either
+
+1. Create a configuration path relative to the application directory (recommended)
+2. Create an absolute path that has to match your target **and** build system
+
+**Example**
+
+.. code-block:: scala
+
+    // configure two different files for bash and bat
+    bashScriptConfigLocation := Some("${app_home}/../conf/jvmopts-bash")
+    batScriptConfigLocation  := Some("%APP_HOME%\\conf\\jvmopts-bat")
+
+
+Now we know how to configure the location of our configuration file. The next step is to learn how to provide content
+for the configuration file.
 
 Via build.sbt
-^^^^^^^^^^^^^
+"""""""""""""
 
-First, you can specify your options via the ``build.sbt``.
+You can specify your options via the ``build.sbt``.
 
 .. code-block:: scala
 
@@ -34,8 +75,11 @@ First, you can specify your options via the ``build.sbt``.
 For the ``-X`` settings you need to add a suffix ``-J`` so the start script will
 recognize these as vm config parameters.
 
+When you use the  ``javaOptions in Universal`` sbt-native-packager will generate configuration files
+if you haven't set the ``batScriptConfigLocation`` and/or ``bashScriptConfigLocation`` to ``None``.
+
 Via Application.ini
-^^^^^^^^^^^^^^^^^^^
+"""""""""""""""""""
 
 The second option is to create ``src/universal/conf/application.ini`` with the following template
 
@@ -77,13 +121,27 @@ The default configuration looks like this
 .. code-block:: scala
 
     bashScriptConfigLocation := Some("${app_home}/../conf/application.ini")
+    batScriptConfigLocation := Some("%APP_HOME%\\conf\\application.ini")
+
+
+Add code to the start scripts
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The second option is to add code to the generated start scripts via these settings.
+
+  ``bashScriptExtraDefines``
+    A list of extra definitions that should be written to the bash file template.
+
+  ``batScriptExtraDefines``
+    A list of extra definitions that should be written to the bat file template.
+
 
 .. _bash-script-defines:
 
 BashScript defines
-^^^^^^^^^^^^^^^^^^
+""""""""""""""""""
 
-The last option is to use the ``bashScriptExtraDefines``. Generally you can add arbitrary
+The bash script accepts extra commands via ``bashScriptExtraDefines``. Generally you can add arbitrary
 bash commands here, but for configurations you have two methods to add jvm and app parameters.
 
 .. code-block:: scala
@@ -105,9 +163,9 @@ bash commands here, but for configurations you have two methods to add jvm and a
 .. _bat-script-defines:
 
 BatScript defines
-^^^^^^^^^^^^^^^^^
+"""""""""""""""""
 
-The Windows batch script accepts extra commands in ``batScriptExtraDefines``. It offers
+The Windows batch script accepts extra commands via ``batScriptExtraDefines``. It offers
 two methods to add jvm and app parameters using similar syntax to the BASH script.
 
 .. code-block:: scala

src/sphinx/archetypes/java_app/index.rst

@@ -95,6 +95,14 @@ have sensible defaults.
   ``batScriptTemplateLocation``
     The location of the bat script template.
 
+  ``bashScriptConfigLocation``
+    The location of the bash script on the target system.
+    **Default** ``${app_home}/../conf/application.ini``
+
+  ``batScriptConfigLocation``
+    The location of the bat script on the target system.
+    **Default** ``%APP_HOME%\conf\application.ini``
+
   ``bashScriptExtraDefines``
     A list of extra definitions that should be written to the bash file template.