Loading steps

Before you can create workflows with scriptcwl, you need to load processing steps (i.e., CommandLineTools, ExpressionTools and/or (sub) Workflows). To load a directory of .cwl files, type:

from scriptcwl import WorkflowGenerator

with WorkflowGenerator() as wf:
        wf.load(steps_dir='/path/to/dir/with/cwl/steps/')

To load a single cwl file, do:

with WorkflowGenerator() as wf:
        wf.load(step_file='/path/to/workflow.cwl')

The path to the step_file can be a local file path or a url.

You can also load a list of step files and directories:

al_my_steps = ['step.cwl', 'url.cwl', '/path/to/directory/']
with WorkflowGenerator() as wf:
        wf.load(step_list=all_my_steps)

wf.load() can be called multiple times. Step files are added to the steps library one after the other. For every step that is added to the steps library, a method with the same name is added to the WorkflowGenerator object. To add a step to the workflow, this method must be called (examples below).