Class: Formatter

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

Constant Summary collapse

COLORS = 
{
  'FG' => {
    'black'  => '30',
    'red'    => '31',
    'green'  => '32',
    'yellow' => '33',
    'blue'   => '34',
    'violet' => '35',
    'cyan'   => '36',
    'white'  => '37',
  },
  'BG' => {
    'black'  => '40',
    'red'    => '41',
    'green'  => '42',
    'yellow' => '43',
    'blue'   => '44',
    'violet' => '45',
    'cyan'   => '46',
    'white'  => '47',
  }
}
DULL = 
'0'
BRIGHT = 
'1'
NULL = 
'00'
ESC = 
"\e"
RESET = 
"#{ESC}[00;0;00m"
SEVERITY_TO_TAG_MAP =

example: 033[40;0;37m white text on black background

{'DEBUG'=>'meh',   'INFO'=>'fyi',   'WARN'=>'hmm',    'ERROR'=>'wtf', 'FATAL'=>'omg', 'UNKNOWN'=>'???'}
SEVERITY_TO_COLOR_MAP = 
{'DEBUG'=>'white', 'INFO'=>'green', 'WARN'=>'yellow', 'ERROR'=>'red', 'FATAL'=>'red', 'UNKNOWN'=>'white'}

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Formatter

Returns a new instance of Formatter.


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# File 'lib/federation_logger.rb', line 44

def initialize
  @colors_enabled = true
end

Instance Method Details

#bg(name) ⇒ Object 


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# File 'lib/federation_logger.rb', line 60

def bg name
  COLORS['BG'][name]
end

#call(severity, time, progname, msg) ⇒ Object 


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# File 'lib/federation_logger.rb', line 72

def call(severity, time, progname, msg)
  fmt_prefix = pretty_prefix(severity, time)
  fmt_msg    = pretty_message(msg)

  "#{fmt_prefix} #{fmt_msg}\n"
end

#colorize(message, c_fg = 'white', c_bg = 'black', strong = 0) ⇒ Object 


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# File 'lib/federation_logger.rb', line 64

def colorize(message, c_fg='white', c_bg='black', strong=0)
  if colors?
    "#{ESC}[#{fg(c_fg)};#{bg(c_bg)};#{strong==0 ? DULL : BRIGHT}m#{message}#{RESET}"
  else
    message
  end
end

#colors? ⇒ Boolean

Returns:

  • (Boolean) 

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

def colors?
  @colors_enabled
end

#fg(name) ⇒ Object 


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# File 'lib/federation_logger.rb', line 56

def fg name
  COLORS['FG'][name]
end

#pretty_message(msg) ⇒ Object 


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

def pretty_message msg
  w = 130
  txt_w = (w - Rails.env.size - 3)

  # get the prefix without colors, just for the length
  @colors_enabled = false
  prefix = pretty_prefix("DEBUG", Time.now).size + 1
  @colors_enabled = true # restore value

  if (msg.size <= (w-prefix))
    msg
  else
    output = msg.strip.scan(/.{1,#{txt_w}}/).flatten.map { |line| sprintf("%#{w}s", sprintf("%-#{txt_w}s", line)) }.join("\n")
    "\n#{output}"
  end
end

#pretty_prefix(severity, time) ⇒ Object 


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# File 'lib/federation_logger.rb', line 79

def pretty_prefix(severity, time)
  color = SEVERITY_TO_COLOR_MAP[severity]
  fmt_severity = colorize(sprintf("%-3s","#{SEVERITY_TO_TAG_MAP[severity]}"), color, 'black', 1)
  fmt_time     = colorize(time.strftime("%s.%L"))
  fmt_env      = colorize(Rails.env, random, 'black', 1)

  "#{fmt_env} - #{fmt_time} [#{fmt_severity}] (pid:#{$$})"
end

#random ⇒ Object 


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

def random
  @random ||= COLORS['FG'].keys[3]
end