`class XTerm`

XTerm style terminal output.

Definitions

`COLORS`

XTerm color codes.

Implementation

COLORS = {
	black: 0,
	red: 1,
	green: 2,
	yellow: 3,
	blue: 4,
	magenta: 5,
	cyan: 6,
	white: 7,
	default: 9,
}.freeze

`ATTRIBUTES`

XTerm attribute codes.

Implementation

ATTRIBUTES = {
	normal: 0,
	bold: 1,
	bright: 1,
	faint: 2,
	italic: 3,
	underline: 4,
	blink: 5,
	reverse: 7,
	hidden: 8,
}.freeze

`def colors?`

Whether the terminal supports colors.

Implementation

def colors?
	true
end

`def size`

The size of the terminal.

Implementation

def size
	@stream.winsize
rescue Errno::ENOTTY
	# Fake it...
	[24, 80]
end

`def width`

The width of the terminal.

Implementation

def width
	size.last
end

`def style(foreground, background = nil, *attributes)`

Apply the given style to the output.

Signature

parameter　foreground　Symbol: The foreground color.
parameter　background　Symbol: The background color.
parameter　attributes　Array(Symbol): The attributes to apply.
returns　String: The style code.

Implementation

def style(foreground, background = nil, *attributes)
	tokens = []
	
	if foreground
		tokens << 30 + COLORS.fetch(foreground)
	end
	
	if background
		tokens << 40 + COLORS.fetch(background)
	end
	
	attributes.each do |attribute|
		tokens << ATTRIBUTES.fetch(attribute){attribute.to_i}
	end
	
	return "\e[#{tokens.join(';')}m"
end

`def reset`

Reset the style.

Signature

returns　String: The reset code.

Implementation

def reset
	"\e[0m"
end