Take fullscreen screenshots using Firefox and Bash

firefox-screenshots.sh

#!/usr/bin/env bash
#
# Take fullscreen screenshots using Firefox.
#
# Author: Justin Hartman <justin@hartman.me>
# Version: 1.0.0
# Copyright (c) 2020 Justin Hartman <https://hartman.me>
#

#######################################
# Defines set of gloval variables.
# Globals:
#   None
# Arguments:
#   String Accepts url to website.
# Returns:
#   None
#######################################
globals () {
    dir='/Users/justin/Google Drive/Google Drive/Images/Screenshots/Full Screen'
    fox='/Applications/Firefox.app/Contents/MacOS/firefox'
    file=$(date +"%Y-%m-%d_%H.%M.%S.png")
    url=$1
    export dir fox file url
}

#######################################
# Navigate to the screenshot folder.
# Globals:
#   None
# Arguments:
#   None
# Returns:
#   None
#######################################
paths() {
    echo -e '📂 Navigating to screenshot directory.'
    cd "${dir}" || exit
}

#######################################
# Take screenshot using FF.
# Globals:
#   None
# Arguments:
#   None
# Returns:
#   None
#######################################
screen() {
    echo "📸 Taking screenshot for: ${url}"
    "${fox}" --screenshot "${file}" "${url}"
}

# Load the global variables.
globals "$@"

# Check if the path to Firefox is correct.
if [[ -f "${fox}" ]]; then
    # Determine if we need the URL input or not.
    if [[ $# -eq 0 ]]; then
        read -rp "🔗 Enter the URL of the website: " url
    fi

    # Run the methods.
    paths
    screen

    # Exit gracefully.
    echo "🏁 Saved screenshot as: ${file}"
    exit 0
else
    echo -e '------------------------------------------------------------------'
    echo -e 'Cannot find your Firefox binary at the following path:'
    echo -e "${fox}\n"
    echo -e 'Please update the path to Firefox in this script in order to fix'
    echo -e 'the issue and then try run this command again.'
    echo -e '------------------------------------------------------------------'

    exit 1
fi