Class: TablePrint

Inherits:
Object
  • Object
show all
Defined in:
lib/table_print.rb

Constant Summary collapse

DELIM = 
'|'

Instance Method Summary collapse

Constructor Details

#initialize(*titles) ⇒ TablePrint

Returns a new instance of TablePrint.



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# File 'lib/table_print.rb', line 18

def initialize(*titles)
  @ncols = titles.length
  @lines = [ ]
  @width = nil
  @lines << titles
  separator = [ ]
  titles.each { |title|
    separator << char_repeat(title.length, '-')
  }
  @lines << separator
end

Instance Method Details

#append(*columns) ⇒ Object 



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# File 'lib/table_print.rb', line 30

def append(*columns)
  @lines << columns
end

#calc_column(line) ⇒ Object 



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# File 'lib/table_print.rb', line 48

def calc_column(line)
  line.length / @width
end

#calc_max_widths ⇒ Object 



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# File 'lib/table_print.rb', line 78

def calc_max_widths
  maxwidth = Array.new(@ncols, 0)
  @lines.each { |line|
    line.each_with_index { |value, index|
      maxwidth[index] = [value.to_s.length, maxwidth[index]].max
    }
  }
  maxwidth
end

#char_repeat(n, char) ⇒ Object 



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# File 'lib/table_print.rb', line 6

def char_repeat(n, char)
  result = ""
  (1..n).each { |i|
    result = result + char
  }
  result
end

#fill_to_next_column(line) ⇒ Object 



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# File 'lib/table_print.rb', line 52

def fill_to_next_column(line)
  tab = @width - (line.length % @width)
  line = line + spaces(tab-1) + DELIM
end

#indent(column) ⇒ Object 



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# File 'lib/table_print.rb', line 34

def indent(column)
  if column == 0
    ""
  else
    segment = spaces(@width-1) + DELIM
    segment * column
  end
end

#next_unprinted_column(col_array, start = 0) ⇒ Object 



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# File 'lib/table_print.rb', line 71

def next_unprinted_column(col_array, start=0)
  for i in (start...col_array.length)
    return i if col_array[i]
  end
  nil
end

#print_old_staggered(maxwidth, term_width) ⇒ Object 



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# File 'lib/table_print.rb', line 135

def print_old_staggered(maxwidth, term_width)
  puts separator(term_width)
  @lines.each_with_index { |line, index|
    next if index == 1
    output = ""
    column = 0
    line.each_with_index { |value, column|
      value = value.to_s
      output = indent(column) if output.length == 0
      if value.length > (@width - 1)
        output = output + value
        println(output)
        output = ""
      else
        output = output + value + spaces(@width - value.length - 1) + DELIM
      end
      column += 1
    }
    println(output) if output.length > 0
    puts separator(term_width)
  }
end

#print_staggered(maxwidth, term_width) ⇒ Object 



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# File 'lib/table_print.rb', line 102

def print_staggered(maxwidth, term_width)
  minw = term_width
  maxwidth.each_with_index { |w, index|
    next if index == 0
    width = (term_width - w) / index
    minw = [width, minw].min
  }
  @width = minw
  puts separator(term_width)
  @lines.each_with_index { |line, lineno|
    next if lineno == 1   # skip line of separators
    output = ""
    cols_left = Array.new(@ncols, true)
    while column = next_unprinted_column(cols_left)
      output = indent(column) if output.length == 0
      while column
        value = line[column].to_s
        cols_left[column] = false   # indicate this column has been printed
        output = output + value
        output = fill_to_next_column(output)
        next_column = calc_column(output)
        column = next_unprinted_column(cols_left, next_column)
        if column && (column > next_column)
          output = output + (spaces(@width-1) + DELIM) * (column - next_column)
        end
      end
      println(output)
      output = ""
    end
    puts separator(term_width)
  }
end

#print_table ⇒ Object 



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# File 'lib/table_print.rb', line 158

def print_table
  return if @lines.nil?
  return if @ncols == 0
  if @ncols == 1
    @lines.each { |line| puts line }
    return
  end

  maxwidth = calc_max_widths
  # will lines fit in terminal
  width_needed = maxwidth.reduce(:+) + (@ncols-1) * 2
  term_width, h = Util.detect_terminal_size
  if width_needed <= term_width
    print_table_normally(maxwidth)
  else
    print_staggered(maxwidth, term_width)
  end
end

#print_table_normally(maxwidth) ⇒ Object 



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# File 'lib/table_print.rb', line 88

def print_table_normally(maxwidth)
  @lines.each { |line|
    output = ""
    line.each_with_index { |value, index|
      output = output + value.to_s + spaces(maxwidth[index] - value.to_s.length + 2)
    }
    puts output[0...-2]
  }
end

#println(line) ⇒ Object

prints a line with DELIMs following in proper columns



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# File 'lib/table_print.rb', line 58

def println(line)
  column = calc_column(line)
  if (column < @ncols)
    line = fill_to_next_column(line)
    column = calc_column(line)
  end
  if (column < @ncols)
    segment = spaces(@width-1) + DELIM
    line = line + segment * (@ncols - column)
  end
  puts strip(line)
end

#separator(width) ⇒ Object 



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# File 'lib/table_print.rb', line 98

def separator(width)
  char_repeat(width, '-')
end

#spaces(n) ⇒ Object 



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# File 'lib/table_print.rb', line 14

def spaces(n)
  char_repeat(n, ' ')
end

#strip(line) ⇒ Object 



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# File 'lib/table_print.rb', line 43

def strip(line)
  regexp = Regexp.new(' *' + Regexp.escape(DELIM) + '*\Z')
  line.sub(regexp, "")
end