gistfile1.sh

#!/bin/bash

#Arguments
export NOVO_LOCALE="EN"

#Constants
export DEPENDS_CMD=( )
export EXIT_CODE_OK=0
export EXIT_CODE_DEPENDENCIES_FAILED=-1
export UI_HORIZONTAL_RULER="================================================================================"

#Localization

export CHECKING_DEPENDENCIES_IN_PROGRESS_RU="Проверка зависимостей..."
export CHECKING_DEPENDENCIES_IN_PROGRESS_EN="Checking dependencies..."

export DEPENDENCIES_OK_RU="Зависимости в порядке."
export DEPENDENCIES_OK_EN="Dependencies OK."

#Methods

#append to file (file name in $1)
append_from_end_of_file () {
    # Skip first argument, all next transformed into one line

    TEMP_PRINT=""
    FIRST_IN_ARRAY="yes"
    for i in "$@"
    do
        if [ ${FIRST_IN_ARRAY} == "yes" ]; then
            FIRST_IN_ARRAY="no";
        else
            TEMP_PRINT="${TEMP_PRINT}${i} ";
        fi
    done
    TEMP_PRINT="${TEMP_PRINT%?}" #remove trailing space character

    export TO_PRINT=${TEMP_PRINT}

    #Use Perl to append to the end of file
    perl -i -pe 'eof && do{chomp; print "$_ \n$ENV{TO_PRINT}\n"; exit}' ${1}
}

hr () {
    echo ${UI_HORIZONTAL_RULER}
}

p () {
    echo $1
}

#http://www.linuxjournal.com/content/return-values-bash-functions
p_ret () {
    RESULT=$2

    local  __resultvar=$1
    local  myresult=$RESULT
    if [[ "$__resultvar" ]]; then
        eval $__resultvar="'$myresult'"
    else
        echo "$myresult"
    fi
}

lp () {
    MAIN_RESULT=""
    for var in "$@"
    do
        LOCALIZED_VAR_NAME="${var}_${NOVO_LOCALE}"
        UNIVERSAL_VAR_NAME="${var}"
        RESULT="err"

        if [ -n "${!LOCALIZED_VAR_NAME}" ]; then
                p_ret RESULT "${!LOCALIZED_VAR_NAME}"
        elif [ -n "${!UNIVERSAL_VAR_NAME}" ]; then
                p_ret RESULT "${!UNIVERSAL_VAR_NAME}"
        else
                p_ret RESULT "${var}"
        fi

        MAIN_RESULT="${MAIN_RESULT} ${RESULT} "
    done
    p "${MAIN_RESULT}"
}

#http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
check_dependency () {
    if hash $1 2>/dev/null; then
        lp $1 "DEPENDENCY_FOUND"
    else
        p ${EXIT_CODE_DEPENDENCIES_FAILED}
    fi
}

check_dependencies () {
    lp "CHECKING_DEPENDENCIES_IN_PROGRESS"
    for dep in "${DEPENDS_CMD[@]}"
    do
        check_dependency "${dep}"
    done
    lp "DEPENDENCIES_OK"
}