allwpilib/shared/resources.gradle

ext.createGenerateResourcesTask = { name, prefix, namespace, project ->
    def generatedOutputDir = file("$buildDir/generated/$name/cpp")

    def inputDir = file("$projectDir/src/$name/native/resources")

    if (!prefix.isEmpty()) prefix += '_'

    def task = project.tasks.create("generateResources-$name") {
        outputs.dir generatedOutputDir
        inputs.dir inputDir

        doLast {
            generatedOutputDir.mkdirs()
            inputDir.eachFile { inputFile ->
                if (inputFile.name.startsWith('.')) return
                    def fileBytes = inputFile.bytes
                def outputFile = file("$generatedOutputDir/${inputFile.name}.cpp")
                def funcName = "GetResource_" + inputFile.name.replaceAll('[^a-zA-Z0-9]', '_')
                outputFile.withWriter { out ->
                    def inputBytes = inputFile.bytes
                    out.print '''#include <stddef.h>
#include <string_view>
extern "C" {
static const unsigned char contents[] = { '''

                    for (int i = 0; i < fileBytes.size(); i++) {
                        out.print String.format('0x%02x', (int) fileBytes[i] & 0xff)
                        out.print ', '
                    }
                    out.println """};
const unsigned char* ${prefix}${funcName}(size_t* len) {
  *len = ${fileBytes.size()};
  return contents;
}
}"""
                    if (!namespace.isEmpty()) {
                        out.println "namespace ${namespace} {"
                    }
                    out.println """std::string_view ${funcName}() {
  return std::string_view(reinterpret_cast<const char*>(contents), ${fileBytes.size()});
}"""
                    if (!namespace.isEmpty()) {
                        out.println '}'
                    }
                }
            }
        }
    }
    return task
}