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✏️ Editing: design.txt

eZ publish Enterprise Component: ConsoleTools, Requirements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Introduction
============

Purpose of the ConsoleTools package
-----------------------------------

The ConsoleTools package will contain several classes to support comfortable
development of console based applications. These classes shall be designed as
independant as possible from each other to let the user flexibly choose, which
ones he likes to use and which not.

Aimed features are:

- Comfortable handling of options and parameters (long, short, values,...)
- Formatting assistance for console output (placing, colors,...)
- Convenience functionality to deal with Windoze and Unix based systems

Current implementation
----------------------

Included classes
^^^^^^^^^^^^^^^^

2 classes are directly involved in the CLI handling.

eZScript
    General initiallization and shutdown script functionality. Very eZ 
    publish specific. Handles initialization of database connection for 
    example, but also some CLI related actions like shutting down every
    thing cleanly and returning an exit code.

eZCLI
    Handles general console output, formating and option parsing.

External classes
^^^^^^^^^^^^^^^^

Beside that, there are dependencies to log/debug/whatever and the following
ones.

eZTextCodec
    Base clase for drivers that convert text between different output formats.
    Currently has 1 extending class: eZCodePageCodec. Part of the I18N
    package.

General involved classes:
eZPublishSDK, eZDebug, eZINI, eZDebugSetting, eZExecution, 
eZExtension, eZDB, eZSession, eZUser, eZModule

General notes
-------------

The functionality for console handling seems to be widly spread over the
current eZ publish classes. Beside that, it is not quite feature complete and
mixed around with web handling classes.

Requirenments
=============

Design goals
------------

The command line handling classes should be redesigned completly, since it's
currently messed up with web related stuff and fully integrated with eZ
publish.

Following functionality will be included:

- General in and output handling functionality

- Output strings

- Style output (color, underline?, ...)
  - Position change
  - Error/notice/warning support

- Handling of options

- Long / short options
  - Dealing with help output
  - Optional and required stuff
  - Dependencies and exclusion of options
  
- Handling of advanced output

- Progress bars (single, keep multiple in mind)
  - Tables

All parts should be as independant as possible. Some parts depend quite hardly
on the output itself, this is ok. Option parsing and handling should _not_
depend on the output class.

Design
======

The design for this package has been splitted into 3 categories of classes:

Output
    This type of classes provide low level output functionality for console
    based applications (like styling text, line breaking,...).
Generation
    This type of classes provide more advanced outputing features (like
    generating structures of text automatically, providing advances
    tools,...). This type of classes depends on the Output classes described
    above, since they output data.
Handling
    This type of classes is independant of both above shown categories and
    provides features for handling common functions in console based
    applications. Since they do not have to output directly, there is no need
    to depend on output functionality.

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