Conditional Tasks #414
Description
In discussions at the Brainhack, the question of conditional tasks came up again, so it seems worth reviving.
I think the most comprehensive previous discussion was in nipy/nipype#2539, but I think we should probably start with desiderata and the state of the current API and see where we can get.
Desiderata
- Run-time conditions should be possible
- Build-time conditions should be detected and avoid generating unnecessary tasks
- ...
Questions
- Should conditionals be on/off, if/else, arbitrary branches (e.g. switch statements)? All of the above?
- Should it be a wrapper around a task e.g.,
wf.add(Conditonal(mytask)), or a parameter e.g.,wf.add(mytask, cond=...)? - ...