1#!/usr/bin/env ruby
2
3# browse --
4# This script generates a directory browser, which lists the working
5# directory and allow you to open files or subdirectories by
6# double-clicking.
7
8require 'tk'
9
10# Create a scrollbar on the right side of the main window and a listbox
11# on the left side.
12
13listbox = TkListbox.new(nil, 'relief'=>'sunken',
14			'width'=>20, 'height'=>20, 'setgrid'=>'yes') {|l|
15  TkScrollbar.new(nil, 'command'=>proc{|*args| l.yview *args}) {|s|
16    pack('side'=>'right', 'fill'=>'y')
17    l.yscrollcommand(proc{|first,last| s.set(first,last)})
18  }
19
20  pack('side'=>'left', 'fill'=>'both', 'expand'=>'yes')
21}
22
23root = TkRoot.new
24root.minsize(1,1)
25
26# The procedure below is invoked to open a browser on a given file;  if the
27# file is a directory then another instance of this program is invoked; if
28# the file is a regular file then the Mx editor is invoked to display
29# the file.
30
31def browse (dir, file)
32  file = dir + File::Separator + file if dir != '.'
33  type = File.ftype(file)
34  if type == 'directory'
35    system($0 + ' ' + file + ' &')
36  else
37    if type == 'file'
38      if ENV['EDITOR']
39	system(ENV['EDITOR'] + ' ' + file + ' &')
40      else
41	system('xedit ' + file + ' &')
42      end
43    else
44      STDOUT.print "\"#{file}\" isn't a directory or regular file"
45    end
46  end
47end
48
49# Fill the listbox with a list of all the files in the directory (run
50# the "ls" command to get that information).
51
52dir = ARGV[0] ?  ARGV[0] : '.'
53open("|ls -a #{dir}", 'r'){|fid| fid.readlines}.each{|fname|
54  listbox.insert('end', fname.chomp)
55}
56
57# Set up bindings for the browser.
58
59Tk.bind_all('Control-c', proc{root.destroy})
60listbox.bind('Double-Button-1',
61	     proc{TkSelection.get.each{|f| browse dir, f}})
62
63Tk.mainloop
64