@subsection Goals

The @file{trunk/Scripts/Bash} directory exists to organize the trunk

development line of @file{centos-art.sh} automation script.  The

@file{centos-art.sh} script standardizes frequent tasks inside your

working copy of CentOS Artwork Repository.

@subsection Description

The best way to understand @file{centos-art.sh} automation script is

studying its source code. The @file{centos-art.sh} script is splited

in several configuration and function files which are loaded when the

@file{centos-art.sh} script is executed. This section describes the

order in which @file{centos-art.sh} loads its configuration and

function files.

When you type the @command{centos-art} command in your terminal, the

operating system trys to execute that command. In order to execute the

command, the operating system needs to know where it is, so the

operating system uses the @var{PATH} environment variable to look for

that command's location. If your system was prepared to use CentOS

Artwork Repository correctly (@pxref{trunk Scripts Bash Functions

Verify}), you should have a symbolic link inside @file{~/bin/}

directory that points to the @file{centos-art.sh} script file. As

@file{~/bin/} directory is, by default, inside @var{PATH} environment

variable, the execution of @command{centos-art} command runs the

@file{centos-art.sh} script.

When @file{centos-art.sh} script is executed, the first it does is

executing the @file{trunk/Scripts/Bash/initFunctions.sh} script to

initialize global variables (e.g., @command{gettext}'s variables) and

global function scripts.  Global function scripts are located inside

@file{trunk/Scripts/Bash/Functions} directory and their file names

begin with @samp{cli}. Global function scripts provide common

functionalities that can be used anywhere inside @file{centos-art.sh}

script execution environment.

Once global variables and function scripts have been loaded,

@file{centos-art.sh} script executes the @command{cli} global function

from @file{cli.sh} function script to retrive command-line arguments

and define some default values that may be used later by specific

function scripts (@pxref{trunk Scripts Bash Functions}).

As convenction, the @file{centos-art.sh} command-line arguments have

the following format:

@verbatim

centos-art arg1 --arg2=val2 --arg3=val3

@end verbatim

In the above example, @samp{centos-art} is the command you use to

invoke @file{centos-art.sh} script. The @samp{arg1} represents the

action you want to do (e.g., @option{verify}, @option{render},

@option{locale}, @option{help}, etc.). The remaining arguments are

modifiers to @option{arg1}. The @option{--arg2} definition is

required.  The @option{--arg3} is optional. For example, if you want

to render all anaconda progress slides, for all major releases of

CentOS distribution, for all languages availabe using TreeFlower motif

as background, you use the following command:

@verbatim

centos-art render --entry=trunk/Identity/Themes/Motifs/TreeFlower/Distro/Anaconda/Progress

@end verbatim

Now, if you only want to render anaconda progress

@file{01-welcome.png} slide, for CentOS distribution major release 5,

in English language, you need to add the third argument as follows:

@verbatim

centos-art render --entry=trunk/Identity/Themes/Motifs/TreeFlower/Distro/Anaconda/Progress --filter=5/en/01-welcome

@end verbatim

Once command-line arguments have been retrived, the

@file{centos-art.sh} script loads specific functions using the

@file{cli_getActions.sh} function script.  For example, if you run the

command @command{centos-art render --entry}, the @file{centos-art.sh}

script will look for @file{trunk/Scripts/Bash/Functions/Render}

directory and will load the @command{render} function from

@file{render.sh} function script; this, in order to achive the

rendering task as it defines.

@float Figure,fig:trunk/Scripts/Bash:Initialization

@verbatim

+------------------------------------------------------------------+

| [centos@host]$ centos-art action 'path/to/dir' --option='value'  |

+------------------------------------------------------------------+

| ~/bin/centos-art --> ~/artwork/trunk/Scripts/Bash/centos-art.sh  |

+---v-----------------------------------------v--------------------+

    | centos-art.sh                           |

    +---v---------------------------------v---+

    .   | initFunctions.sh                |   .

    .   +---------------------------------+   .

    .   | cli $@                          |   .

    .   +---v-------------------------v---+   .

    .   .   | cli_getActions          |   .   .

    .   .   +---v-----------------v---+   .   .

    .   .   .   | function call 1 |   .   .   .

    .   .   .   | function call 2 |   .   .   .

    .   .   .   | function call n |   .   .   .

    .   .   .   +-----------------+   .   .   .

    .   .   ...........................   .   .

    .   ...................................   .

    ...........................................

@end verbatim

@caption{The @file{centos-art.sh} initialization environment.}

@end float

@subsection Usage

The @file{centos-art.sh} script usage information is described inside

each specific function documentation (@pxref{trunk Scripts Bash

Functions}).

@subsection See also

@menu

* trunk Scripts::

* trunk Scripts Bash Functions::

* trunk Scripts Bash Locale::

@end menu