Class: Brut::TUI::Terminal

Inherits:
Object
  • Object
show all
Defined in:
lib/brut/tui/terminal.rb

Overview

Stores metdata about the current temrinal in use. This should provide any metadata about the terminal that can be reliably determined.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Terminal

Returns a new instance of Terminal.



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# File 'lib/brut/tui/terminal.rb', line 9

def initialize
  trap("WINCH") do
    @winsize = IO.console.winsize
  end
end

Instance Method Details

#background_color ⇒ Object

Best attempt to guess the background color of the current terminal. This will not refresh if that color is changed, and its behavior will default to black if determining the color doesn't work or isn't supported.



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# File 'lib/brut/tui/terminal.rb', line 29

def background_color
  @bakground_color ||= begin
                         io.write "\e]11;?\a"
                         io.flush

                         result = nil

                         begin
                           # Read the reply, which should look like:
                           #   ESC ] 11 ; rgb:0000/0000/0000 BEL
                           Timeout.timeout(0.1) do
                             buf = +""
                             loop do
                               ch = stdin.getch
                               buf << ch
                               break if ch == "\a" || buf.end_with?("\e\\") # BEL or ST terminator
                             end
                             result = buf
                           end
                         rescue Timeout::Error
                           # no reply within 100ms — terminal probably doesn’t support it
                         end

                         rgb = [ 0, 0, 0 ]
                         if result
                           if result =~ /\e\]11;([^ \a\e]*)[\a\e\\]/
                             color = Regexp.last_match(1)
                             parts = color[/rgb:(.*)/, 1]&.split("/")
                             if parts

                               rgb = parts.map { it.to_i(16) / 0xffff.to_f * 256 }.map(&:to_i)
                             end
                           end
                         end
                         rgb
                       end
end

#cols ⇒ Object

Number of columns for the current terminal. Should be consistent even after a resize



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# File 'lib/brut/tui/terminal.rb', line 18

def cols = winsize[1]

#io ⇒ Object

The IO used for outputing information to the terminal. Prefer this over STDOUT.



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# File 'lib/brut/tui/terminal.rb', line 21

def io    = $stdout

#rows ⇒ Object

Number of rows for the current terminal. Should be consistent even after a resize



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# File 'lib/brut/tui/terminal.rb', line 16

def rows = winsize[0]
# Number of columns for the current terminal. Should be consistent even after a resize

#stdin ⇒ Object

The IO to use for requesting input from the user



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# File 'lib/brut/tui/terminal.rb', line 24

def stdin = $stdin