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sclass ProgramPackager {
  File jarFile;
  S mainProgramID;
  S mainClassName;
  Set<S> excludeSnippets;
  Cl<S> extraSnippets;
  
  VF1<ZipOutputStream> copyAdditionalFiles = voidfunc(ZipOutputStream jar) {
    file2zip(jar, programFile("gazelle-concepts.zip"));
  };
  
  *(File *jarFile, S *mainProgramID, S *mainClassName) {}
  
  *(File *jarFile, S *mainProgramID) {
    assertNotNull("Please set mainClassName in " + mainProgramID,
      mainClassName = tok_mainClassNameFromJavaXSnippet(mainProgramID));
  }
  
  Set<S> snippetIDs;
  Map<S, Collection<S>> trace;

  void go ctex {
    Pair<File, S> programJarAndSrc = CompilerBot.compileSnippet2(mainProgramID);
    
    if (snippetIDs == null) {
      temp IProgressShower p = tempProgressBar("Collecting dependencies", 100);
      
      trace = new Map;
      snippetIDs = recursivelyCollectSnippetIDsFromTranspiled(
        itemPlusList(mainProgramID, extraSnippets),
        trace_out := minimalNotifyingMap(trace, r {
          p.setValue(l(trace));
        }),
        exclude := excludeSnippets);
    }
    
    temp IProgressShower p = tempProgressBar("JAR", or_nonZeroLong(fileSize(jarFile), megabytes(30)));
    {
      temp ZipOutputStream jar = zipOutputStream(jarFile);
      temp tempShowFileSizeProgress(p, jarFile);
      
      makeManifestWithMainClass(jar, mainClassName);
      
      zip2zip_exceptManifest2(programJarAndSrc.a, jar,
        // exclude those:
        litset("main.java"));
      
      zip_addTextFile(jar, "back-references.txt", 
        renderMap_colon_lines(reverseMultiMap_tree(pseudoToRealMultiMap(trace)).data));
        
      SS titles = getSnippetTitles_cached(snippetIDs);
      zip_addTextFile(jar, "snippet-titles.struct", struct(titles));
      new TreeMap<S, Int> types;
    
      for (S snippetID : snippetIDs) {
        continue if isPseudoSnippetID(snippetID);
        int type = getSnippetType(snippetID);
        types.put(snippetID, type);
        if (type == snippetType_image()) {
          File img = loadLibrary(snippetID);
          addFileToZip(jar, img, psI(snippetID) + "." + (isGIF(img) ? "gif" : "png"));
        } else if (type == snippetType_data())
          addFileToZip(jar, loadLibrary(snippetID), psI(snippetID) + ".bin");
        else pcall {
          S text = loadSnippet(snippetID);
          if (text != null)
            zip_addTextFile(jar, psI(snippetID) + ".text", text);
          if (isJavaxCompilableSnippetTypeExceptInclude(type))
            zip_addTextFile(jar, psI(snippetID) + ".transpiled", getServerTranspiled2(snippetID));
        }
      }
      
      zip_addTextFile(jar, "snippet-types.struct", struct(types));
      
      File javaxJar = pathToJavaxJar();
      print("Copying: " + javaxJar);
      zip2zip_exceptManifest2(javaxJar, jar,
        // exclude those:
        litset("transpilationDate"));
      
      callF(copyAdditionalFiles, jar);
    } // jar close
    
    makeExecutable(jarFile);
    fileSavedInfoBox(jarFile);
  }
}