Blame Scripts/Bash/Functions/Commons/init.sh

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#!/bin/bash
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#
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# init.sh -- This function initiates the application's command-line
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# interface.  Variables defined in this function are accesible by all
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# other functions. The cli function is the first script executed by
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# the application command-line onces invoked.
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#
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# Copyright (C) 2009, 2010, 2011, 2012 The CentOS Project
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function init {
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    # Initialize global variables.
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    local CLI_FUNCNAME=''
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    local CLI_FUNCDIRNAM=''
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    local CLI_FUNCSCRIPT=''
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    local ARGUMENTS=''
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    # Initialize default value to filter flag. The filter flag
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    # (--filter) is used mainly to reduce the number of files to
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    # process. The value of this variable is interpreted as
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    # egrep-posix regular expression.  By default, everything matches.
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    local FLAG_FILTER='.+'
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    # Initialize default value to verbosity flag. The verbosity flag
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    # (--quiet) controls whether centos-art.sh script prints messages
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    # or not. By default, all messages are printed out.
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    local FLAG_QUIET='false'
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    # Initialize default value to answer flag. The answer flag
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    # (--answer-yes) controls whether centos-art.sh script does or
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    # does not pass confirmation request points. By default, it
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    # doesn't.
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    local FLAG_ANSWER='false'
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    # Initialize default value to don't commit changes flag. The don't
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    # commit changes flag (--dont-commit-changes) controls whether
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    # centos-art.sh script syncronizes changes between the central
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    # repository and the working copy. By default, it does.
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    local FLAG_DONT_COMMIT_CHANGES='false'
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    # Initialize list of common functionalities to load.
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    local FILES=$(ls ${CLI_FUNCDIR}/Commons/*.sh)
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    # Initialize common functionalities.
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    for FILE in ${FILES};do
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        if [[ -x ${FILE} ]];then
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            . ${FILE}
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            export -f $(grep '^function ' ${FILE} | cut -d' ' -f2)
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        else
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            echo "`eval_gettext "The \\\$FILE needs to have execution rights."`"
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            exit
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        fi
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    done
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    # Trap signals in order to terminate the script execution
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    # correctly (e.g., removing all temporal files before leaving).
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    # Trapping the exit signal seems to be enough by now, since it is
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    # always present as part of the script execution flow. Each time
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    # the centos-art.sh script is executed it will inevitably end with
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    # an EXIT signal at some point of its execution, even if it is
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    # interrupted in the middle of its execution (e.g., through
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    # `Ctrl+C').
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    trap cli_terminateScriptExecution 0
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    # Redefine ARGUMENTS variable using current positional parameters. 
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    cli_parseArgumentsReDef "$@"
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    # Check function name. The function name is critical for
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    # centos-art.sh script to do something coherent. If it is not
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    # provided, execute the help functionality and end script
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    # execution.
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    if [[ ! "$1" ]] || [[ ! "$1" =~ '^[[:alpha:]]' ]];then
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        exec ${CLI_BASEDIR}/${CLI_NAME}.sh help
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        exit
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    fi
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    # Define function name (CLI_FUNCNAME) using the first argument in
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    # the command-line.
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    CLI_FUNCNAME=$(cli_getRepoName $1 -f | cut -d '-' -f 1)
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    # Define function directory. 
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    CLI_FUNCDIRNAM=$(cli_getRepoName $CLI_FUNCNAME -d)
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    # Define function file name.
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    CLI_FUNCSCRIPT=${CLI_FUNCDIR}/${CLI_FUNCDIRNAM}/${CLI_FUNCNAME}.sh
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    # Check function script execution rights.
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    cli_checkFiles "${CLI_FUNCSCRIPT}" --execution
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    # Remove the first argument passed to centos-art.sh command-line
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    # in order to build optional arguments inside functionalities. We
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    # start counting from second argument (inclusive) on.
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    shift 1
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    # Redefine ARGUMENTS using current positional parameters.
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    cli_parseArgumentsReDef "$@"
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    # Define default text editors used by centos-art.sh script.
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    if [[ ! "$EDITOR" =~ '/usr/bin/(vim|emacs|nano)' ]];then
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        EDITOR='/usr/bin/vim'
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    fi
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    # Check text editor execution rights.
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    cli_checkFiles $EDITOR --execution
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    # Go for function initialization. Keep the cli_exportFunctions
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    # function calling after all variables and arguments definitions.
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    cli_exportFunctions "${CLI_FUNCDIR}/${CLI_FUNCDIRNAM}"
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    # Execute function.
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    eval $CLI_FUNCNAME
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}