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* lib/downloader: New progress bar design, with more info * Reduce progress bar update time * Clear progress bar when success only * Update progress_bar.rb * Update downloader.rb
105 lines
3.3 KiB
Ruby
105 lines
3.3 KiB
Ruby
require 'io/console'
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require_relative 'color'
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require_relative 'convert_size'
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class ProgressBar
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attr_accessor :progress_bar_showing
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def initialize (total_size)
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# character used to fill the progress bar, one of the box-drawing character in unicode
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@bar_char = "\u2501"
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# color scheme of progress bar, can be changed
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# see color.rb for more available colors
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@bar_front_color = :lightcyan
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@bar_bg_color = :gray
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# all info blocks with space taken
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@info_before_bar = { downloaded_size_in_str: 20 }
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@info_after_bar = { percentage_in_str: 4, elapsed_time_in_str: 8 }
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@percentage = @downloaded = 0
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@total_size = total_size.to_f
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@total_size_in_str = human_size(@total_size)
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trap('WINCH') do
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# reset width settings after terminal resized
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# get terminal size, calculate the width of progress bar based on it
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@terminal_h, @terminal_w = IO.console.winsize
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@bar_width = @terminal_w -
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@info_before_bar.merge(@info_after_bar).values.sum - # space that all info blocks takes
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( @info_before_bar.merge(@info_after_bar).length * 2 ) # space for separator (whitespaces) between each info
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rescue NoMethodError => e
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# fallback for non-interactive terminals
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unless $non_interactive_term_warned
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warn 'Non-interactive terminals may not be able to be queried for size.'
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$non_interactive_term_warned = true
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end
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@terminal_h, @terminal_w = [ 25, 80 ]
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end
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Process.kill('WINCH', 0) # trigger the trap above
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end
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def set_downloaded_size (downloaded_size)
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if @start_time
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@elapsed_time = (Time.now - @start_time).to_i
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else
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# record start time, used for calculating elapsed time
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@start_time = Time.now
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@elapsed_time = 0
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end
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@elapsed_time_in_str = Time.at(@elapsed_time).utc.strftime('%H:%M:%S')
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# calculate progress percentage, round to nearest 0.1
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@percentage = ( ( downloaded_size / @total_size ) * 100 ).round(1)
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@percentage_in_str = "#{@percentage.to_i}%"
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# {downloaded size}/{total size}
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@downloaded_size_in_str = "#{human_size(downloaded_size)}/#{@total_size_in_str}"
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end
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def show
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return Thread.new do
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@progress_bar_showing = true
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print "\e[?25l" # hide cursor to prevent cursor flickering
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while @progress_bar_showing
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sleep 0.15 # update progress bar after each 0.15 seconds
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completed_length = ( @bar_width * (@percentage / 100) ).to_i
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uncompleted_length = @bar_width - completed_length
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# print info and progress bar
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@info_before_bar.each_pair do |varName, width|
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printf "%*.*s ", width, width, instance_variable_get("@#{varName}")
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end
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# print progress bar with color code
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print ( @bar_char * completed_length ).send(@bar_front_color),
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( @bar_char * uncompleted_length ).send(@bar_bg_color)
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@info_after_bar.each_pair do |varName, width|
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printf " %*.*s", width, width, instance_variable_get("@#{varName}")
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end
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# stop when 100%
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if @percentage >= 100
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print "\e[2K\r" # clear previous line (progress bar)
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break
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else
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print "\r"
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end
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end
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ensure
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print "\e[?25h" # restore cursor mode since we hide it before
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end
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end
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end
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