Class: OsCtl::Lib::Cli::OutputFormatter

Inherits:
Object
  • Object
show all
Defined in:
lib/libosctl/cli/output_formatter.rb

Overview

Format and print data in column or row view

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(objects, cols: nil, opts: {}, header: true, sort: nil, layout: nil, empty: '-', color: false) ⇒ OutputFormatter

Returns a new instance of OutputFormatter.

Parameters:

  • objects (Hash, Array)
  • cols (Array<Symbol, Hash>, nil) (defaults to: nil) —

    a list of parameter names to show

  • opts (Hash<Symbol, Hash>) (defaults to: {}) —

    column options

  • header (Boolean) (defaults to: true) —

    whether to show header

  • sort (Array<Symbol>, nil) (defaults to: nil) —

    array of parameter names to sort by

  • layout (:columns, :rows) (defaults to: nil)
  • empty (String) (defaults to: '-') —

    string used for nil values

  • color (Boolean) (defaults to: false) —

    handle color escape sequences in formatted strings



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# File 'lib/libosctl/cli/output_formatter.rb', line 27

def initialize(objects, cols: nil, opts: {}, header: true, sort: nil, layout: nil, empty: '-', color: false)
  @objects = objects
  @opts = opts
  @header = header
  @sort = sort
  @layout = layout
  @empty = empty
  @color = color

  if @layout.nil?
    @layout = if many?
                :columns

              else
                :rows
              end
  end

  if cols
    @cols = parse_cols(cols)

  elsif @objects.is_a?(::Array) # A list of items
    if @objects.count == 0
      @cols = []
    else
      @cols ||= parse_cols(@objects.first.keys)
    end

  elsif @objects.is_a?(::Hash) # Single item
    @cols ||= parse_cols(@objects.keys)

  else
    raise "unsupported type #{@objects.class}"
  end
end

Class Method Details

Format data and print to standard output



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# File 'lib/libosctl/cli/output_formatter.rb', line 14

def self.print(*, **)
  f = new(*, **)
  f.print
end

.to_s ⇒ String

Format data and return as string

Returns:

  • (String) 


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# File 'lib/libosctl/cli/output_formatter.rb', line 8

def self.to_s(*, **)
  f = new(*, **)
  f.to_s
end

Instance Method Details

#col_width(i, c) ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 261

def col_width(i, c)
  w = c[:label].to_s.length

  @str_objects.each do |o|
    len = if @color
            Rainbow::StringUtils.uncolor(o[i].to_s).length
          else
            o[i].to_s.length
          end

    w = len if len > w
  end

  w + 1
end

#columns ⇒ Object (protected)

Each object is printed on one line, it’s parameters aligned into columns.



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# File 'lib/libosctl/cli/output_formatter.rb', line 124

def columns
  # Calculate column widths
  @cols.each_with_index do |c, i|
    c[:width] = col_width(i, c)
  end

  # Print header
  if @header
    line(@cols.map.with_index do |c, i|
      fmt =
        if i == (@cols.count - 1)
          '%s'
        elsif c[:align].to_sym == :right
          "%#{c[:width]}s"
        else
          "%-#{c[:width]}s"
        end

      format(fmt, c[:label])
    end.join('  '))
  end

  # Print data
  @str_objects.each do |o|
    line(@cols.map.with_index do |c, i|
      s = o[i].to_s

      if @color
        # If there are colors in the string, they affect the string size
        # and thus sprintf formatting. sprintf is working with characters
        # that the terminal will consume and not display (escape sequences).
        # The format string needs to be changed to accomodate for those
        # unprintable characters.
        s_nocolor = Rainbow::StringUtils.uncolor(s)

        w = if s_nocolor.length == s.length
              c[:width]

            else
              c[:width] + (s.length - s_nocolor.length)
            end
      else
        w = c[:width]
      end

      fmt =
        if i == (@cols.count - 1)
          '%s'
        elsif c[:align].to_sym == :right
          "%#{w}s"
        else
          "%-#{w}s"
        end

      format(fmt, s)
    end.join('  '))
  end
end

#each_object ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 289

def each_object(&)
  if @objects.is_a?(::Array)
    @objects.each(&)

  else
    yield(@objects)
  end
end

#generate ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 106

def generate
  return if @cols.empty?

  prepare

  case @layout
  when :columns
    columns

  when :rows
    rows

  else
    raise "unsupported layout '#{@layout}'"
  end
end

#heading_width ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 277

def heading_width
  w = @cols.first[:label].to_s.length

  @cols.each do |c|
    len = c[:label].to_s.length

    w = len if len > w
  end

  w + 1
end

#line(str = '') ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 211

def line(str = '')
  if @out
    @out += "#{str}\n"

  else
    puts str
  end
end

#many? ⇒ Boolean (protected)

Returns:

  • (Boolean) 


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# File 'lib/libosctl/cli/output_formatter.rb', line 298

def many?
  @objects.is_a?(::Array) && @objects.size > 1
end

#parse_cols(cols) ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 77

def parse_cols(cols)
  ret = []

  cols.each do |c|
    base = {
      align: 'left'
    }

    if c.is_a?(::String) || c.is_a?(::Symbol)
      base.update({
        name: c,
        label: c.to_s.upcase
      })
      base.update(@opts.fetch(c, {}))
      ret << base

    elsif c.is_a?(::Hash)
      base.update(c)
      base.update(@opts.fetch(c[:name], {}))
      ret << base

    else
      raise "unsupported column type #{c.class}"
    end
  end

  ret
end

#prepare ⇒ Object (protected) 



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# File 'lib/libosctl/cli/output_formatter.rb', line 220

def prepare
  @str_objects = []

  each_object do |o|
    arr = []

    @cols.each do |c|
      v = o[c[:name]]
      str = (c[:display] ? c[:display].call(v, o) : v)
      str = @empty if !str || (str.is_a?(::String) && str.empty?)

      arr << str
    end

    @str_objects << arr
  end

  if @sort
    col_indexes = @sort.map do |s|
      i = @cols.index { |c| c[:name] == s }
      raise "unknown sort column '#{s}'" unless i

      i
    end

    @str_objects.sort! do |a, b|
      a_vals = col_indexes.map { |i| a[i] }
      b_vals = col_indexes.map { |i| b[i] }
      cmp = a_vals <=> b_vals
      next(cmp) if cmp

      next(-1) if [nil, @empty].detect { |v| a_vals.include?(v) }
      next(1) if [nil, @empty].detect { |v| b_vals.include?(v) }

      0
    end
  end

  @str_objects
end

#print ⇒ Object 



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# File 'lib/libosctl/cli/output_formatter.rb', line 70

def print
  @out = nil
  generate
end

#rows ⇒ Object (protected)

Each object is printed on multiple lines, one parameter per line.



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# File 'lib/libosctl/cli/output_formatter.rb', line 184

def rows
  w = heading_width if @header

  @str_objects.each do |o|
    @cols.each_index do |i|
      c = @cols[i]

      unless @header
        line o[i]
        next
      end

      if o[i].is_a?(::String) && o[i].index("\n")
        lines = o[i].split("\n")
        v = ([lines.first] + lines[1..].map { |l| (' ' * (w + 3)) + l }).join("\n")

      else
        v = o[i]
      end

      line format("%#{w}s:  %s", c[:label], v)
    end

    line
  end
end

#to_s ⇒ String

Returns:

  • (String) 


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# File 'lib/libosctl/cli/output_formatter.rb', line 64

def to_s
  @out = ''
  generate
  @out
end