[Qbs] Rule.Return dynamic list for outputArtifacts

[Карелин Павел]

Hello.

I recently needed to develop a rule for a sip generator (see below). 
Basically, the rule works well, but yesterday it failed. At the output, 
sip-generator create 6 cpp-files of the following format: 
sip_corepartX.cpp (this is justified from the point of view of parallel 
compilation, cpp-file sizes can be tens of megabytes). These 6 cpp-files 
are reflected in the outputArtifacts parameter. However, yesterday I 
came across a small sip-file, and the generated cpp-files turned out to 
be not 6, but only 5. Naturally, my rule failed.

Question: how can I resolve my situation?
Of course, I can tell the sip-generator to create fewer cpp-files 
(parameter -j), but I would like to understand - are there other ways?
For example, to ignore section
{
filePath: generatedFilesDir + "/sip" + moduleSipName + "part5.cpp",
    fileTags: ["cpp"],
    cpp: {
      cxxFlags: sipCxxFlags
    }
}
if the file ("sip" + moduleSipName + "part5.cpp") does not exist

--
BR, Pavel Karelin

     Rule {
         multiplex: true
         inputs: ["sip"]
         outputFileTags: ["cpp", "hpp", "pyi"]
         outputArtifacts: {
             var baseSipFile = product.sip.baseSipFile;
             var moduleSipName = product.sip.moduleSipName
             var generatedFilesDir = product.sip.generatedFilesDir

             var baseSipName = FileInfo.baseName(baseSipFile);

             //console.info("sip_corepart: " + generatedFilesDir + 
"/sip" + moduleSipName + "part0.cpp")
             //console.info("sip 1 :")

             var sipCxxFlags = [
                 "-Wno-deprecated-declarations",
                 "-Wno-deprecated",
                 "-Wno-unused-variable",
                 "-Wno-switch",
                 //"-Wno-unused-function",
                 //"-Wno-unused-but-set-variable",
                 //"-Wno-unused-parameter",
             ]

             return [{ // sip_corepart0.cpp
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part0.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part1.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part2.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part3.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part4.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{
                 filePath: generatedFilesDir + "/sip" + moduleSipName + 
"part5.cpp",
                 fileTags: ["cpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{ // sipAPI_core.h
                 filePath: generatedFilesDir + "/sipAPI" + moduleSipName 
+ ".h",
                 fileTags: ["hpp"],
                 cpp: {
                     cxxFlags: sipCxxFlags
                 }
             },{ // core.pyi
                 filePath: project.buildDirectory + "/python/" + 
baseSipName + ".pyi",
                 fileTags: ["pyi"],
             }];
         }

         prepare: {
             var baseSipFile = product.sip.baseSipFile;
             var moduleSipName = product.sip.moduleSipName;
             var generatedFilesDir = product.sip.generatedFilesDir;

             var baseSipName = FileInfo.baseName(baseSipFile);

             // usr/bin/sip -w -e -x ANDROID -x ARM -x MOBILITY_LOCATION 
-n sip -t WS_X11 -t Qt_5_12_4 -g -o
             // -a /home/hkarel/CProjects/QGIS/build2/python/qgis.core.api
             // -n sip
             // -y 
/home/hkarel/CProjects/QGIS/build2/output/python/qgis/core.pyi
             // -j 6
             // -c /home/hkarel/CProjects/QGIS/build2/python/core
             // -I /home/hkarel/CProjects/QGIS/build2/python/core
             // -I /usr/share/sip/PyQt5
             // /home/hkarel/CProjects/QGIS/build2/python/core/core.sip

             var args = ["-w", "-e", "-g", "-o", "-j", "6", "-n", "sip"];
             args = args.concat(["-x", "ANDROID", "-x", "ARM", "-x", 
"MOBILITY_LOCATION"]);
             args = args.concat(["-t", "WS_X11", "-t", "Qt_5_12_4"])

             args.push("-c");
             args.push(generatedFilesDir);

             args.push("-I");
             args.push(generatedFilesDir);

             args.push("-I");
             args.push(project.buildDirectory + "/python");

             args.push("-I");
             args.push("/usr/share/sip/PyQt5");

             args.push("-y");
             args.push(project.buildDirectory + "/python/" + baseSipName 
+ ".pyi");

             args.push(generatedFilesDir + "/" + baseSipFile);

             //File.makePath(generatedFilesDir);
             //console.info("sip 0 : " + args)

             var cmd = new Command("/usr/bin/sip", args);
             cmd.workingDirectory = project.buildDirectory + "/python";
             cmd.description = "sip code generation";
             cmd.highlight = "codegen";
             return cmd;
         }

     }
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