[stringtemplate-interest] Way to merge/save changes to generated code

[Gerald Rosenberg]

XText uses a convenient strategy of external fragments, thereby avoiding 
most if not all diff/merge issues.  Empty fragments are generated iff 
the files do not exist.  The generated code just delegates to named 
fragments where customization is anticipated.

// regenerable
public class SessionFacade1 {
   public String method1(Object arg) {
     String response = SessionFacade1Fragment.method1(arg);
     if (!response.isEmpty()) return response;
     return "hello";
   }
}

// generated once
public class SessionFacade1Fragment {
   public static String method1(Object arg) {
     /* User hand-written code */
     return "";
     /* end User hand-written code */
   }
}

On 3/26/2010 2:16 PM, Richard Catlin wrote:
> I am using Antlr/StringTemplate to generate a SessionFacde class.  I 
> then need to fill in some of the methods.  Is there a way to 
> merge/save the user hand written code, if the file is regenerated.  I 
> thought using SVN would at least allow me to diff the file and cut and 
> paste the user hand written code, but was wondering if anyone has a 
> better strategy for automating.  Other tools like Acceleo have a 
> merge/lost feature.  "lost" is user code that could not be merged due 
> to a change in the generated code, such as a method deletion.
>
> For instance, a Session Facade may be:
>
> public class SessionFacade1 {
>   public String method1() {
>     /* User hand-written code */
>     return "hello";
>     /* end User hand-written code */
>   }
> }
>
> Thanks for any help.
> Richard Catlin
>
>
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