shopify script - count cart items by tag

# enumerate and count by tag

# get items matching tag "x" from cart as array[]
product_x_items = Input.cart.line_items.select do |line_item|
    product = line_item.variant.product # get product

    !product.gift_card? && product.tags.include?("x") # return boolean to selector
end

# get total number of items
match_count = product_x_items.inject(0) { |sum, p| sum + p.quantity } # https://apidock.com/rails/Enumerable/sum

puts "Items matching x:"
puts match_count # print value to the console

# ---

# enumerate and count by tags

# tags to match
DISCOUNT_TAGS = [ "discount_1", "discount_2" ]

tagged_items = Input.cart.line_items.select do |line_item|
    product = line_item.variant.product # get product

    # compare product tags and tags we're looking for, either method below works
    # https://apidock.com/ruby/Array/include%3F
    !product.gift_card? && product.tags & DISCOUNT_TAGS != [] # return boolean
    #!product.gift_card? && product.tags.any? { |i| DISCOUNT_TAGS.include?(i) } # return boolean
end

# get total number of items
tagged_items_count = tagged_items.inject(0) { |sum, p| sum + p.quantity } # https://apidock.com/rails/Enumerable/sum

puts "Tagged Items:"
puts tagged_items_count # print value to the console

Output.cart = Input.cart