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Accessing Source File Paths

Source Names and Paths​

System properties provide source file paths, separated by java.io.File.pathSeparator.

  • scala.source.names filenames without a path.
  • scala.sources full paths to source files

System property scala.source.names​

This simple script reports the script file name:

val name = sys.props("scala.source.names")
println(s"scriptName: $name")
scala-cli reportNames.sc
# scriptName: reportNames.sc

Likewise, for this .scala program:

object Main {
  def main(args: Array[String]): Unit =
    val names = sys.props("scala.source.names")
    println(names)
}
scala-cli SourceNames.scala
# SourceNames.scala

This java program prints a comma-separated list of source names:

public class NamesLister {
  public static void main(String[] args) {
    String sourceNames = System.getProperty("scala.source.names");
    String[] names = sourceNames.split(java.io.File.pathSeparator);
    String list = String.join(",", names);
    System.out.printf("%s\n", list);
  }
}

scala-cli NamesLister.java
# NamesLister.java

If multiple sources are provided, all are displayed:

scala-cli NamesLister.java reportNames.sc SourceNames.scala --main-class NamesLister
# NamesLister.java,reportNames.sc,SourceNames.scala

System property scala.sources​

public class PathsLister {
  public static void main(String[] args) {
    String paths = System.getProperty("scala.sources");
    String list = String.join(",", paths.split(java.io.File.pathSeparator));
    System.out.printf("%s\n", list);
  }
}

The property "scala.sources" displays full source file paths:

scala-cli PathsLister.java reportNames.sc SourceNames.scala --main-class PathsLister
# /tmp/workdir/PathsLister.java,/tmp/workdir/reportNames.sc,/tmp/workdir/SourceNames.scala

Other examples​

When multiple .md files with plain scala snippets are being run, names and paths can refer to '.md' files:

# Main class A
```scala
println(s"A: ${sys.props("scala.source.names")}")
```
# Main class 2
```scala
println(s"2: ${sys.props("scala.source.names")}")
```

When multiple such sources are passed as inputs, the main class has to be passed explicitly with the --main-class option.

scala-cli --power MainA.md MainB.md --main-class MainA_md
# A: MainA.md:MainB.md
1: MainA.md:MainB.md