.. _cheat_sheet:


#####################
Cheat Sheet
#####################

The ``ruffus`` module is a lightweight way to add support 
for running computational pipelines.

| Each stage or **task** in a computational pipeline is represented by a python function
| Each python function can be called in parallel to run multiple **jobs**.

================================================
1. Annotate functions with **Ruffus** decorators
================================================

******
Basic 
******
.. csv-table::
   :header: "Decorator", "Syntax"
   :widths: 100, 600,1
   
   "**@follows**  (:ref:`Manual <manual.follows>`)   
   ", "
   | :ref:`@follows <decorators.follows>` ( ``task1``, ``'task2'`` ))
   | :ref:`@follows <decorators.follows>` ( ``task1``,  :ref:`mkdir <decorators.follows.directory_name>`\ ( ``'my/directory/for/results'`` ))
   
   ", ""
   "**@files** (:ref:`Manual <manual.files>`)
   ", "
   | :ref:`@files <decorators.files>`\ ( ``parameter_list`` )
   | :ref:`@files <decorators.files>`\ ( ``parameter_generating_function`` )
   | :ref:`@files <decorators.files>` ( ``input_file``, ``output_file``, ``other_params``, ... )
   
   ", ""

******
Core
******
.. csv-table::
   :header: "Decorator", "Syntax"
   :widths: 100, 600,1

   "**@split** (:ref:`Manual <manual.split>`)   
   ", "
   :ref:`@split <decorators.split>` ( ``tasks_or_file_names``, ``output_files``, [``extra_parameters``,...] )
   ", ""
   "**@transform** (:ref:`Manual <manual.transform>`)   
   ", "
   | :ref:`@transform <decorators.transform>` ( ``tasks_or_file_names``, :ref:`suffix <decorators.transform.suffix_string>`\ *(*\ ``suffix_string``\ *)*\ , ``output_pattern``, [``extra_parameters``,...] )
   | :ref:`@transform <decorators.transform>` ( ``tasks_or_file_names``, :ref:`regex <decorators.transform.matching_regex>`\ *(*\ ``regex_pattern``\ *)*\ , ``output_pattern``, [``extra_parameters``,...] )
   
   ", ""
   "**@merge** (:ref:`Manual <manual.merge>`)   
   ", "
   :ref:`@merge <decorators.merge>` (``tasks_or_file_names``, ``output``, [``extra_parameters``,...] )
   ", ""
   "**@posttask** (:ref:`Manual <manual.posttask>`)   
   ", "
   | :ref:`@posttask <decorators.posttask>` ( ``signal_task_completion_function`` )
   | :ref:`@posttask <decorators.posttask>` (:ref:`touch_file <decorators.touch_file>`\ ( ``'task1.completed'`` ))
   
   ", ""

************************************************************************************************
See :ref:`Decorators <decorators>` for a complete list of decorators
************************************************************************************************



================================================
2. Print dependency graph if necessary
================================================

- For a graphical flowchart in ``jpg``, ``svg``, ``dot``, ``png``, ``ps``, ``gif`` formats::

        pipeline_printout_graph ( open("flowchart.svg", "w"),
                                 "svg",
                                 list_of_target_tasks)

.. comment
    
        This requires the `dot programme <http://www.graphviz.org/>`_ to be installed

- For a text printout of all jobs ::

        pipeline_printout(sys.stdout, list_of_target_tasks)


================================================
3. Run the pipeline
================================================

::

    pipeline_run(list_of_target_tasks, [list_of_tasks_forced_to_rerun, multiprocess = N_PARALLEL_JOBS])


See the :ref:`Simple Tutorial <Simple_Tutorial>` for a quick introduction on how to add support
for ruffus.


