Module: ReadTimeFilter

Defined in:
lib/read_time.rb

Overview

Installation: drop this into your _plugins folder Usage: page.content | read_time } Note: this requires img tags to be in the form of <img … />. If you're using this on a post listing page, make sure to markdownify the post content first.

Instance Method Summary collapse

Instance Method Details

#read_time(input) ⇒ Object 



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# File 'lib/read_time.rb', line 10

def read_time(input)
    words_per_minute = 275
    # number of seconds per image to start at, default is 12s
    img_time_max = 12
    # time per image will decrease by 1 for every image, to a minimum
    # of this time, default is 3s
    img_time_min = 3

    strings = input.split(/<img.* \/>/)

    seconds = (strings.join(" ").split.size.to_f / (words_per_minute / 60))

    # number of images minus one for correct number of iterations
    (strings.size - 2).times do |i|
        t = (img_time_max - i)
        image_time = t > img_time_min ? t : img_time_min
        seconds = seconds + image_time
    end

    minutes = (seconds / 60).ceil

    "#{minutes} min read"
end