@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