[GROOVY-3692] specify encoding for File's combinient methods (eachLine,..) - ASF JIRA

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In File's some convenient methods like File#eachLine(), File#splitEachLine() and others, there is no way to specify the encoding for reading.

For example, there is no 'File#eachLine(String charSet, Closure c)' method.

Of cource, we can write:

new InputStreamReader(new FileInputStream(new File("file_to_read.txt")), charSet).eachLine {
  ..
}

but this is not so groovy.

My proposal is, to add encoding() method to java.io.File as a GDK enhancement method, which can be used like:

new File(args[0]).encoding("utf-8").eachLine {
  println it
}

As reference, if write it by EMC, the definition of method encoding is like:

File.metaClass.encoding = { cs ->
  new InputStreamReader(new FileInputStream(delegate), cs)
}

GDK of java.io.InputStreamReader has equivalents each* methods, this is enough.