How to save a Pharo Smalltalk package to disk in Tonel format?

Question

I would like to write Pharo Smalltalk scripts that load and save Smalltalk packages to disk in tonel format but I don't understand the API for saving packages.

Loading from Tonel on disk into the image works like this:

(TonelReader on: aRepositoryDirectory fileName: packageName)
    version load.

but what is the inverse operation that saves a package onto disk? (assuming that the package name and target directory are supplied.)

(I explicitly want to avoid using advanced tools like Metacello and Iceberg here. I want to either use the Tonel library directly or else Monticello without depending on any previous repository configuration.)

Answer 1

Perhaps unsurprisingly, it looks like the inverse of TonelReader is implemented by TonelWriter:

[[[ TonelWriter on: ('someDirectory' asFileReference ensureCreateDirectory) ]]]

Here is a full example courtesy Luke:

[ :packageName :directory |
      TonelWriter fileOut:  packageName asPackage mcWorkingCopy on: directory.
] value: 'BaselineOfTonel' value: '/tmp/tonel-test'