[JVM] How to add custom resources into output jar

kevinresol · August 28, 2021, 8:29am

Is there a compiler flag for adding static resources into the output jar?

In other words, I want to add a custom entry such as META-INF/my_file.txt to the list returned by the command: jar tf bin/Main.jar

(for those who need a workaround: jar is just a zip file so it is possible to add files to it manually via zip/unzip)

kevinresol · August 28, 2021, 8:39am

Okay, --resource META-INF/my_file.txt almost did it. Except it becomes META-x45INF/my_file.txt in the jar. Apparently that’s because the dash is being escaped:

github.com

HaxeFoundation/haxe/blob/6eb36b2aa38591203005ea30f8334e41de292111/std/haxe/io/Path.hx#L329-L332

    
      
          	private static function escape(path:String, allowSlashes:Bool = false):String {
          		var regex = allowSlashes ? ~/[^A-Za-z0-9_\/\\\.]/g : ~/[^A-Za-z0-9_\.]/g;
          		return regex.map(path, function(v) return '-x' + v.matched(0).charCodeAt(0));
          	}

github.com

HaxeFoundation/haxe/blob/6eb36b2aa38591203005ea30f8334e41de292111/src/codegen/codegen.ml#L69-L76

    
      
          let escape_res_name name allow_dirs =
          	ExtString.String.replace_chars (fun chr ->
          		if (chr >= 'a' && chr <= 'z') || (chr >= 'A' && chr <= 'Z') || (chr >= '0' && chr <= '9') || chr = '_' || chr = '.' then
          			Char.escaped chr
          		else if chr = '/' && allow_dirs then
          			"/"
          		else
          			"-x" ^ (string_of_int (Char.code chr))) name

Is there a reason why the dash has to be escaped?

RealyUniqueName · August 28, 2021, 10:43am

I guess it’s because dash is used to detect escaped sequences (-xNN)

kevinresol · August 28, 2021, 3:21pm

Can we have something like --jar-resources resources which will copy everything under the resources folder into the jar without name mangling?

kevinresol · September 2, 2021, 2:09pm

Okay, I made a maven plugin which makes maven call the haxe compiler to produce the required bytecodes. (Normally maven calls the java compiler)

In that case I am able to make use of the entire maven build tool, including resource bundling mentioned in the OP. So I would say the problem is solved for now.