Class: Bundler::Stats::Printer

Inherits:
Object
  • Object
show all
Defined in:
lib/bundler/stats/printer.rb

Overview

this is somewhat duplicative of the table_print gem, but tbh I like that we don’t have many dependencies yet, so I’d rather keep it this way.

Constant Summary collapse

MIN_COL_SIZE = 
10
BORDERS = 
{
  on: { corner: "+", horizontal: "-", vertical: "|" },
  off: { corner: " ", horizontal: " ", vertical: " " },
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(headers: nil, data: [], borders: true) ⇒ Printer

Returns a new instance of Printer.



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# File 'lib/bundler/stats/printer.rb', line 13

def initialize(headers: nil, data: [], borders: true)
  @headers  = headers
  @data     = data
  @borders  = borders ? BORDERS[:on] : BORDERS[:off]
end

Instance Attribute Details

#borders ⇒ Object

Returns the value of attribute borders.



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# File 'lib/bundler/stats/printer.rb', line 4

def borders
  @borders
end

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/bundler/stats/printer.rb', line 4

def data
  @data
end

#headers ⇒ Object

Returns the value of attribute headers.



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# File 'lib/bundler/stats/printer.rb', line 4

def headers
  @headers
end

Instance Method Details

#column_widths(table_data) ⇒ Object 



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# File 'lib/bundler/stats/printer.rb', line 45

def column_widths(table_data)
  num_cols  = table_data.first.length
  chrome    = 2 + 2 + (num_cols - 1) * 3

  # doesn't fit at all
  if chrome + (num_cols * MIN_COL_SIZE) > terminal_width
    raise ArgumentError, "Table smooshed. Refusing to print table."
  end

  data_widths = 0.upto(num_cols - 1).map do |idx|
    max_width(table_data.map { |row| row[idx] })
  end

  # fits comfortably
  if data_widths.inject(&:+) + chrome < terminal_width
    return data_widths
  end

  free_space = terminal_width
  free_space -= chrome
  free_space -= MIN_COL_SIZE * num_cols

  # fit uncomfortably
  widths = [MIN_COL_SIZE] * num_cols
  data_widths.each_with_index do |width, idx|
    next unless width > widths[idx]

    allocated = [width, free_space].min

    if allocated > 0
      widths[idx] += allocated
      free_space  -= allocated
    end
  end

  widths
end

#terminal_width ⇒ Object 



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# File 'lib/bundler/stats/printer.rb', line 39

def terminal_width
  Integer(Kernel.send(:"`", "tput cols"))
rescue StandardError
  80
end

#to_s ⇒ Object 



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# File 'lib/bundler/stats/printer.rb', line 19

def to_s
  table_data = ([headers] + data).compact
  col_widths = column_widths(table_data)

  lines = []
  lines << separator_row(col_widths)

  if headers
    lines << aligned_row(headers, col_widths)
    lines << separator_row(col_widths)
  end

  data.each do |row|
    lines += split_rows(row, col_widths)
  end
  lines << separator_row(col_widths)

  lines.join("\n")
end