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Diffstat (limited to 'sample/curses/view2.rb')
-rw-r--r-- | sample/curses/view2.rb | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/sample/curses/view2.rb b/sample/curses/view2.rb deleted file mode 100644 index 037771a226..0000000000 --- a/sample/curses/view2.rb +++ /dev/null @@ -1,149 +0,0 @@ -#!/usr/local/bin/ruby - -require "curses" - - -# A curses based file viewer -class FileViewer - - # Create a new fileviewer, and view the file. - def initialize(filename) - @data_lines = [] - @screen = nil - @top = nil - init_curses - load_file(filename) - interact - end - - # Perform the curses setup - def init_curses - # signal(SIGINT, finish) - - Curses.init_screen - Curses.nonl - Curses.cbreak - Curses.noecho - - @screen = Curses.stdscr - - @screen.scrollok(true) - #$screen.keypad(true) - end - - # Load the file into memory, and put - # the first part on the curses display. - def load_file(filename) - fp = open(filename, "r") do |fp| - # slurp the file - fp.each_line { |l| - @data_lines.push(l.chop) - } - end - @top = 0 - @data_lines[0..@screen.maxy-1].each_with_index{|line, idx| - @screen.setpos(idx, 0) - @screen.addstr(line) - } - @screen.setpos(0,0) - @screen.refresh - rescue - raise "cannot open file '#{filename}' for reading" - end - - - # Scroll the display up by one line - def scroll_up - if( @top > 0 ) - @screen.scrl(-1) - @top -= 1 - str = @data_lines[@top] - if( str ) - @screen.setpos(0, 0) - @screen.addstr(str) - end - return true - else - return false - end - end - - # Scroll the display down by one line - def scroll_down - if( @top + @screen.maxy < @data_lines.length ) - @screen.scrl(1) - @top += 1 - str = @data_lines[@top + @screen.maxy - 1] - if( str ) - @screen.setpos(@screen.maxy - 1, 0) - @screen.addstr(str) - end - return true - else - return false - end - end - - # Allow the user to interact with the display. - # This uses EMACS-like keybindings, and also - # vi-like keybindings as well, except that left - # and right move to the beginning and end of the - # file, respectively. - def interact - while true - result = true - c = Curses.getch - case c - when Curses::KEY_DOWN, Curses::KEY_CTRL_N, ?j - result = scroll_down - when Curses::KEY_UP, Curses::KEY_CTRL_P, ?k - result = scroll_up - when Curses::KEY_NPAGE, ?\s # white space - for i in 0..(@screen.maxy - 2) - if( ! scroll_down ) - if( i == 0 ) - result = false - end - break - end - end - when Curses::KEY_PPAGE - for i in 0..(@screen.maxy - 2) - if( ! scroll_up ) - if( i == 0 ) - result = false - end - break - end - end - when Curses::KEY_LEFT, Curses::KEY_CTRL_T, ?h - while( scroll_up ) - end - when Curses::KEY_RIGHT, Curses::KEY_CTRL_B, ?l - while( scroll_down ) - end - when ?q - break - else - @screen.setpos(0,0) - @screen.addstr("[unknown key `#{Curses.keyname(c)}'=#{c}] ") - end - if( !result ) - Curses.beep - end - @screen.setpos(0,0) - end - Curses.close_screen - end -end - - -# If we are being run as a main program... -if __FILE__ == $0 - if ARGV.size != 1 then - printf("usage: #{$0} file\n"); - exit - end - - viewer = FileViewer.new(ARGV[0]) -end |