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@samuelorji
Last active December 22, 2019 23:31
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build with config file
lazy val fetchConfFile = taskKey[File]("fetch Config file")
fetchConfFile := {
//simulate fetching a remote file
sLog.value.info("fetching file ...... ")
Thread.sleep(1000)
new java.io.File("/tmp/application.conf").createNewFile()
val configFile : File = new java.io.File("/tmp/application.conf")
sLog.value.info("done fetching file .... ")
configFile
}
lazy val zip = taskKey[Unit]("zip files")
zip := {
val logger = sLog.value
val fromZip: File = srcFile.value
val toZip: File = baseDirectory.value / "build_and_config.zip"
// we expect this to be run before the `fetchConfFile task
// but this is actually run after
logger.info(s"zipping files from ${fromZip.absolutePath}")
//1.) calling .value actually executes this task
//2.) sbt figures that the `zip task depends on the `fetchConfFile task
// so sbt actually runs the `fetchConfFile task before running the actual `zip task
val configFile: File = fetchConfFile.value
val filesToZip = List(configFile, fromZip)
val fos = new FileOutputStream(toZip)
// zip function
filesToZip.foldLeft(new ZipOutputStream(fos)){
case (zs, file) =>
val fis = new FileInputStream(file)
val zipEntry = new ZipEntry(file.getName)
zs.putNextEntry(zipEntry)
@scala.annotation.tailrec
def readAgain(c: Int): Int = {
if (c < 0) {
-1
} else {
zs.write(c)
readAgain(fis.read())
}
}
readAgain(fis.read())
fis.close()
zs
}.close()
logger.info(s"zipped files to ${toZip.absolutePath}")
}
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