Blame Documentation/Models/Docbook/Tcar-ug/Scripts/Bash/cliref.docbook

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<sect1 id="scripts-bash-cliref">
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    <title>Script Command-line Interface</title>
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    <para>
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        The <command>centos-art.sh</command> script follows a
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        conventional command-line interface where there might be
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        options and non-option arguments in it. As convention, the
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        first non-option argument passed to
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        <command>centos-art.sh</command> script will be the name of
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        the specific function you want to execute (e.g.,
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        <function>render</function>, <function>locale</function>,
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        <function>help</function>, etc.).  This first argument will be
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        immediately removed from the list of arguments passed to
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        <command>centos-art.sh</command> script to leave just the
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        remaining options and non-option arguments passed to it.  At
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        this point, the <command>centos-art.sh</command> script uses
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        the <command>getopt</command> command to retrieve option
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        arguments and remove them from the list of arguments passed to
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        <command>centos-art.sh</command> script.
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    </para>
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    <para>
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        Once option arguments have been removed from list of arguments
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        passed to <command>centos-art.sh</command> script, non option
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        arguments are processed then.  Non-option arguments will
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        always be paths pointing directories inside your working copy
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        of &TCAR;. These paths can be absolute paths or relative paths
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        considering the working copy root directory as section. For
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        example, both the absolute path 
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        class="directory">/home/al/Projects/CentOS/artwork/trunk/Identity/Themes/</filename>
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        and the relative path 
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        class="directory">trunk/Identity/Themes</filename> point to
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        the same location.
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    </para>
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    <para>
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        To better understand the <command>centos-art.sh</command>
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        command-line interface, let's consider the real command shown
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        in <xref linkend="scripts-bash-cliref-cli-example1" /> as
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        section.  This command shows the entire command as a list of
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        space-separated arguments. The value of each argument can be
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        reached using special variable names based on the number of
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        arguments passed to the command-line.
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    </para>
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    <example id="scripts-bash-cliref-cli-example1">
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    <title>The command-line interface</title>
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    <screenshot>
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    <screeninfo>The command-line interface</screeninfo>
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    <mediaobject>
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    <textobject>
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<programlisting>
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   ${0}  | |${1}| |          ${2}            | |    ${3}   |
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---------|-|----|-|--------------------------|-|-----------|
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centos-art render trunk/Identity/Images/Themes --with-brands
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---------|-|----|-|--------------------------|-|-----------|
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</programlisting>
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    </textobject>
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    </mediaobject>
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    </screenshot>
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    </example>
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    <para>
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        In <xref linkend="scripts-bash-cliref-cli-example1" />, the
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        relation between special variables and arguments has the
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        following meaning:
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    </para>
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    <variablelist>
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    <varlistentry>
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    <term><varname>${0}</varname></term>
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    <listitem>
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    <para>
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        This variable contains the absolute path to the command
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        executed. In case your home directory be 
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        class="directory">/home/john</filename> the value of this
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        argument will be expanded to
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        <filename>/home/john/bin/centos-art</filename> which is a
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        symbolic link to the
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        <filename>${TCAR_WORKDIR}/trunk/Scripts/Bash/centos-art.sh</filename>
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        file.
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    </para>
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    </listitem>
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    </varlistentry>
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    <varlistentry>
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    <term><varname>${1}</varname></term>
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    <listitem>
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    <para>
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        This variable contains the first non-option argument we use to
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        determine the specific function environment we want to execute
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        (e.g., <function>render</function> in this case). The position
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        of this information in the command-line is relevant to
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        <command>centos-art.sh</command> script and must not be
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        changed. Possible values to this variable are specified in
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        <xref linkend="scripts-bash-cli-specificfuncs" />.
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    </para>
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    </listitem>
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    </varlistentry>
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    <varlistentry>
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    <term><varname>${2}</varname></term>
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    <listitem>
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    <para>
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        This variable contains a non-option argument referring a path
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        information inside the working copy of &TCAR;. The specific
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        path information you provide in this variable must be
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        recognized by specific function environment provided in
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        <varname>${1}</varname> variable. The position of path
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        information in the command-line is not relevant to
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        <command>centos-art.sh</command> script and can be changed
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        whenever it doesn't be interpreted as value to
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        <varname>${1}</varname> variable.
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    </para>
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    </listitem>
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    </varlistentry>
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    <varlistentry>
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    <term><varname>${3}</varname></term>
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    <listitem>
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    <para>
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        This variable contains an option argument. The specific option
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        information you provide in this variable must be recognized by
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        specific function environment provided in
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        <varname>${1}</varname> variable. The position of options in
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        the command-line is not relevant to
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        <command>centos-art.sh</command> script and can be changed
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        whenever it doesn't be interpreted as value to
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        <varname>${1}</varname> variable.
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    </para>
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    </listitem>
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    </varlistentry>
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    </variablelist>
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    <sect2 id="scripts-bash-cli-commonoptions">
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    <title>Common Options</title>
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    <para>
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        As convention, all function specific environments should
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        provide support for the following common options: 
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    </para>
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    <variablelist>
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    <varlistentry>
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    <term><option>-h</option> | <option>--help</option></term>
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    <listitem>
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    <para>
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        This option makes <command>centos-art.sh</command> script to
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        shows information about the specific function environment
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        (e.g., how to execute it, available options, etc.) set as
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        first non-option argument. For example, if you provide the
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        <command>centos-art render --help</command>, the
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        <command>centos-art.sh</command> script will display to you
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        the information related to the 
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        class="directory">trunk/Scripts/Bash/Functions/Render</filename>
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        directory.
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    </para>
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    <para>
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        This information is retrived from <quote>The CentOS Artwork
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        Repository File System (tcar-fs)</quote> documentation manual.
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        This manual is written in Texinfo format and provides a quick
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        way for you to read and browse documentation related to each
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        directory inside &TCAR; as you work with it from a text
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        terminal.
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    </para>
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    </listitem>
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    </varlistentry>
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    <varlistentry>
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    <term><option>-q</option> | <option>--quiet</option></term>
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    <listitem>
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    <para>
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        This option makes the <command>centos-art.sh</command> script
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        to suppress messages sent to standard output. This option
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        doesn't suppress error messages, nor questions related to
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        script execution.
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    </para>
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    </listitem>
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    </varlistentry>
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    </variablelist>
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    </sect2>
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    <sect2 id="scripts-bash-cli-specificoptions">
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    <title>Specific Options</title>
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    <para>
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        The specific options used by specific and common function
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        environments are described in their respective sections. See
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        <xref linkend="scripts-bash-cli-specificfuncs" /> and 
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        linkend="scripts-bash-cli-commonfuncs" /> to know which these
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        sections are.
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    </para>
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    <title>Specific Function Environments</title>
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    <tgroup cols="2" align="left">
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        <row>
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            <entry>Name</entry>
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            <entry>Description</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-prepare" /></entry>
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            <entry>Standardize configuration tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-render" /></entry>
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            <entry>Standardize rendition tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-locale" /></entry>
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            <entry>Standardize localization tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-help" /></entry>
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            <entry>Standardize documentation tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-pack" /></entry>
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            <entry>Standardize packing tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-tuneup" /></entry>
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            <entry>Standardize maintainance tasks inside &TCAR;</entry>
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        </row>
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        <row>
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            <entry><xref linkend="scripts-bash-svn" /></entry>
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            <entry>Standardize version control tasks inside &TCAR;</entry>
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        </row>
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    </tgroup>
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    <title>Common Function Environments</title>
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    <tgroup cols="2" align="left">
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        <row>
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            <entry>Name</entry>
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            <entry>Description</entry>
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        </row>
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        <row>
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            <entry><literal>cli_checkFiles</literal></entry>
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            <entry>...</entry>
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        </row>
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    </tgroup>
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    </sect2>
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    <sect2 id="scripts-bash-cliref-implementation">
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        <title>Implementation</title>
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        <para>
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            When a new function is created to
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            <command>centos-art.sh</command> script, it is necessary
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            to consider whether it will use arguments or not. When the
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            function doesn't need arguments (e.g., it exists to
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            redefine values related to global variables only) there is
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            no need to consider a parsing feature for it.  However,
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            when the function does use arguments it is very important
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            to parse them appropriately (e.g., by using a parsing feature like
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            that provided by <command>getopt</command> command).
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        </para>
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        <para>
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            In this section will describe how to parse arguments (both
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            option and non-option) inside the
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            <command>centos-art.sh</command> script.  This information
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            must be used as section whenever you need to create a
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            new function for <command>centos-art.sh</command> script.
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        </para>
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    </sect2>
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</sect1>