Format Your Output in Terminal with Ruby

If we want to output content in the command line, generally speaking, Ruby basic methods are enough, such as puts, print, and sprintf; but if we want to output color in the terminal, table, and progress bar, etc., it will be more difficult to achieve.

Here, I want to share gems that I feel good using in this situation:

Color output (based on ANSI): rainbow
Table output: terminal-table
Large composite (contains color, table, and progress bar): formatador

Rainbow

The underlying mechanism for outputting colored text in the console comes from ANSI escape sequences, e.g. to output the word Red in red, it should be "\e[31mRed\e[0m".

puts "\e[31mRed\e[0m"
=> Red

It's too much trouble to organize this escape sequence by ourselves, but fortunately rainbow can help us do this, using other is also very simple (as follows), foreground color, background color, underline and other formats are supported, and more features refer to his README rainbow

Rainbow("hello").red
# => "\e[31mhello\e[0m" ("hello" if not on TTY)
Rainbow("hola!").blue.bright.underline
# => "\e[34m\e[1m\e[4mhola!\e[0m"

Terminal-table

The use of terminal-table is also fairly simple and straightforward, and adding table headers and setting alignment is easy: ``

require 'terminal-table'

rows = []
rows << ['One', 1]
rows << ['Two', 2]
rows << ['Three', 3]

table = Terminal::Table.new :headings => ['Word', 'Number'], :rows => rows

# > puts table
#
# +-------+--------+
# | Word | Number |
# +-------+--------+
# | One | 1 |
# | Two | 2 |
# | Three | 3 |
# +-------+--------+

formatador

formatador seems to me to be a large and comprehensive formatting tool, and is straightforward to use.

Color output

Formatador.display_line('[green]Hello World[/]')

Table

table_data = [
  { :name => "Joe", :food => "Burger" }
  { :name => "Bill", :food => "French fries" }
]
Formatador.display_table(table_data)

#=> +------+--------------+
# | name | food |
# +------+--------------+
# | Joe | Burger |
# +------+--------------+
# | Bill | French fries |
# +------+--------------+

Progress bar

total = 1000
progress = Formatador::ProgressBar.new(total)

1000.times do
  sleep 0.01
  progress.increment
end

#=> 978/1000 | ************************************************* |

Hegwin.Me