work correctly in JRuby manually installing the ffi-ncurses gem is the only way to get highline to operate correctly in JRuby. The ncurses library is only present on unix platforms so this is not a solution for using highline in JRuby on windows.
Windows savvy getc().
WARNING: This method ignores input and reads one character from STDIN!
![[+]](../images/find.png "show/hide quicksearch"){kind=small}
# File lib/highline/system_extensions.rb, line 37
37: def get_character( input = STDIN )
38: Win32API.new("crtdll", "_getch", [ ], "L").Call
39: end
ncurses savvy getc(). (JRuby choice.)
# File lib/highline/system_extensions.rb, line 100
100: def get_character( input = STDIN )
101: FFI::NCurses.initscr
102: FFI::NCurses.cbreak
103: begin
104: FFI::NCurses.curs_set 0
105: input.getbyte
106: ensure
107: FFI::NCurses.endwin
108: end
109: end
Unix savvy getc(). (First choice.)
WARNING: This method requires the “termios” library!
# File lib/highline/system_extensions.rb, line 72
72: def get_character( input = STDIN )
73: old_settings = Termios.getattr(input)
74:
75: new_settings = old_settings.dup
76: new_settings.c_lflag &= ~(Termios::ECHO | Termios::ICANON)
77: new_settings.c_cc[Termios::VMIN] = 1
78:
79: begin
80: Termios.setattr(input, Termios::TCSANOW, new_settings)
81: input.getbyte
82: ensure
83: Termios.setattr(input, Termios::TCSANOW, old_settings)
84: end
85: end
Unix savvy getc(). (Second choice.)
WARNING: This method requires the external “stty” program!
# File lib/highline/system_extensions.rb, line 126
126: def get_character( input = STDIN )
127: raw_no_echo_mode
128:
129: begin
130: input.getbyte
131: ensure
132: restore_mode
133: end
134: end
Switched the input mode to raw and disables echo.
WARNING: This method requires the external “stty” program!
# File lib/highline/system_extensions.rb, line 141
141: def raw_no_echo_mode
142: @state = `stty -g`
143: system "stty raw -echo -icanon isig"
144: end
Restores a previously saved input mode.
WARNING: This method requires the external “stty” program!
# File lib/highline/system_extensions.rb, line 151
151: def restore_mode
152: system "stty #{@state}"
153: end
A Windows savvy method to fetch the console columns, and rows.
# File lib/highline/system_extensions.rb, line 42
42: def terminal_size
43: m_GetStdHandle = Win32API.new( 'kernel32',
44: 'GetStdHandle',
45: ['L'],
46: 'L' )
47: m_GetConsoleScreenBufferInfo = Win32API.new(
48: 'kernel32', 'GetConsoleScreenBufferInfo', ['L', 'P'], 'L'
49: )
50:
51: format = 'SSSSSssssSS'
52: buf = ([0] * format.size).pack(format)
53: stdout_handle = m_GetStdHandle.call(0xFFFFFFF5)
54:
55: m_GetConsoleScreenBufferInfo.call(stdout_handle, buf)
56: bufx, bufy, curx, cury, wattr,
57: left, top, right, bottom, maxx, maxy = buf.unpack(format)
58: return right - left + 1, bottom - top + 1
59: end
A ncurses savvy method to fetch the console columns, and rows.
# File lib/highline/system_extensions.rb, line 160
160: def terminal_size
161: size = [80, 40]
162: FFI::NCurses.initscr
163: begin
164: size = FFI::NCurses.getmaxyx(stdscr).reverse
165: ensure
166: FFI::NCurses.endwin
167: end
168: size
169: end
A Unix savvy method using stty that to fetch the console columns, and rows. … stty does not work in JRuby
# File lib/highline/system_extensions.rb, line 173
173: def terminal_size
174: if /solaris/ =~ RUBY_PLATFORM and
175: `stty` =~ /\brows = (\d+).*\bcolumns = (\d+)/
176: [$2, $1].map { |c| x.to_i }
177: else
178: `stty size`.split.map { |x| x.to_i }.reverse
179: end
180: end
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