| GNU General Public License for more details.                          |

|                                                                       |

| You should have received a copy of the GNU General Public License     |

| along with this program.  If not, see <http://www.gnu.org/licenses/>. |

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

EOF

}

# Set-up colours for message printing if we're not piping and terminal is

# capable of outputting the colors.

_color_terminal=$(tput colors 2>&1)

    _text_bold=$(tput bold)

    _text_white=$(tput setaf 7)

    _text_blue=$(tput setaf 6)

    _text_green=$(tput setaf 2)

    _text_yellow=$(tput setaf 3)

    _text_red=$(tput setaf 1)

    _text_reset=$(tput sgr0)

else

    _text_bold=""

    _text_white=""

    _text_blue=""

    _text_green=""

        V) virtualenv="$OPTARG";;

        q) quiet=1;;

        d) debug=1;;

        v) version

           exit "$SUCCESS";;

        h) usage

           exit "$SUCCESS";;

        *) usage

           exit "$ERROR_ARGUMENTS";;

    esac

done

i=$OPTIND

if [[ ${#@} == 0 ]]; then

    error "Must pass configuration directory."

    usage

    exit "$ERROR_ARGUMENTS"

fi

# Verify positional arguments.

config_dir="$1"

if [[ ! -d $config_dir ]]; then

    error "No such directory: $config_dir"

    exit "$ERROR_ARGUMENTS"

fi

# Make sure virtual environment exists.

if [[ -n $virtualenv && ! -f $virtualenv/bin/activate ]]; then

    error "Invalid virtual environment specified: $virtualenv"

    exit "$ERROR_ARGUMENTS"

fi

# Activate the virtual environment if it was specified.

[[ -n $virtualenv ]] && source "$virtualenv/bin/activate"

# Verify pip-compile is available.

if ! which pip-compile >/dev/null 2>&1; then

    error "Could not find command pip-compile from packagep pip-tools. Package might not be available in the virtual environment."

    exit "$ERROR_PIP_TOOLS_MISSING"

fi

# Process each environment.

for environment in "$config_dir"/*; do

    # Empty directory.

    if [[ ! -e $environment ]]; then

        )

        # Calculate up-to-date requirements.

        if ! new=$("${pip_compile_invocation[@]}"); then

            error "Failed while running pip-compile command against (see error stack trace above): $req_in"

            continue

        fi

        # Clean up the new requirements to contain only package

        # versioning information.

        new=$(echo "$new" | sed -e 's/[[:blank:]]*#.*//' | grep -v "^$" | sort -u)

        # Run diff, storing the output and result.

        # This is using Bash process substitution, which helps avoid

        # creating and keeping track of temporary files (since diff

        # must be fed with two input files). E.g. the <() will

        # essentially be path to a Bash-created/managed temporary

        # file.

        diff=$(diff -u <(echo "$current") <(echo "$new"))

        result="$?"

        # Show warning about available updates.

        if [[ $result == 0 ]]; then