makepipe 0.1.0

make_*()

• Made dependencies argument to make_*() optional (#25).

• Added a force argument to make_*() (#26). This allows the user to override
  the default conditional execution logic to ensure that a given segment of the
  pipeline is run no matter what.

Segment

• Implemented Segment class to serve as the basic building block for the
  Pipeline (#28). This clarifies the link between the fundamental make_*()
  functions and the Pipeline object. In particular, each make_*() call
  constructs a Segment which is appended to the Pipeline.

• The Segment class has an execute() method, which replicates the execution
  behaviour of the make_*() functions. Hence Segment$execute() can be run to
  rebuild the targets associated with a given segment without adding a new
  segment to the Pipeline as would be done if we called make_*() again.
• The Segment holds all execution metadata (e.g. execution result, execution
  time, etc.). This is updated via the Segment$update_result() method whenever
  Segment$execute() is called.

• Added a build() method to the Pipeline class, which sorts the Segments
  topologically and then calls execute() on each in turn.

• Added a clean() method to the Pipeline class, which deletes the targets
  associated with each Segment.

• Removed the now redundant makepipe_result S3 class. All of the information
  that was held by the makepipe_result is now held by the Segment.

Bug fixes

• Fixed a minor bug in Pipeline$print() which was causing user-supplied
  annotations to be overwritten (#23).

• Fixed a minor bug in make_register() (#22). Previously, an error would be thrown
  when using make_register() outside of a makepipe segment if the user set
  quiet=TRUE. This is no longer the case.

Documentation

• Added a getting started vignette (#19).