Class: Manager

Inherits:
Object
  • Object
show all
Defined in:
lib/cless/cless.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

Commands = 
{
  "scroll_forward_line" => :scroll_forward_line,
  "scroll_backward_line" => :scroll_backward_line,
  "scroll_forward_half_screen" => :scroll_forward_half_screen,
  "scroll_backward_half_screen" => :scroll_backward_half_screen,
  "scroll_right" => :scroll_right,
  "scroll_left" => :scroll_left,
  "hide_columns" => :hide_columns_prompt,
  "unhide_columns" => :unhide_columns,
  "toggle_hide_ignored" => :toggle_hide_ignored,
  "toggle_headers" => :show_hide_headers,
  "change_headers_to_line" => :change_headers_to_line_content_prompt,
  "toggle_line_highlight" => :toggle_line_highlight,
  "toggle_column_highlight" => :toggle_column_highlight,
  "shift_line_highlight" => :shift_line_highlight,
  "shift_column_highlight" => :shift_column_highlight,
  "regexp_line_highlight" => :regexp_line_highlight_prompt,
  "column_align_left" => :column_align_left,
  "column_align_right" => :column_align_right,
  "column_align_center" => :column_align_center,
  "column_align_auto" => :column_align_auto,
  "right_align_regexp" => :right_align_regexp_prompt,
  "column_width" => :column_width_prompt,
  "forward_search" => :forward_search,
  "backward_search" => :backward_search,
  "repeat_search" => :repeat_search,
  "save_to_file" => :save_file_prompt,
  "goto_position" => :goto_position_prompt,
  "format_column" => :column_format_prompt,
  "column_start_index" => :change_column_start_prompt,
  "ignore_line" => :ignore_line_prompt,
  "remove_ignore_line" => :ignore_line_remove_prompt,
  "split_regexp" => :change_split_pattern_prompt,
  "separator_character" => :change_separator_prompt,
  "separator_padding" => :change_padding_prompt,
  "export" => :export_prompt,
  "help" => :display_help,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, display, db) ⇒ Manager

Returns a new instance of Manager.



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# File 'lib/cless/cless.rb', line 93

def initialize(data, display, db)
  @data = data
  @display = display
  @db = db
  @done = false
  @status = ""
  @prebuff = ""
  @half_screen_lines = nil
  @full_screen_lines = nil
  @scroll_columns = nil
  @interrupt = false
  @search_history = []
  @max_search_history = 100
end

Instance Attribute Details

#max_search_history ⇒ Object

Returns the value of attribute max_search_history.



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# File 'lib/cless/cless.rb', line 92

def max_search_history
  @max_search_history
end

#search_history ⇒ Object

Returns the value of attribute search_history.



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# File 'lib/cless/cless.rb', line 92

def search_history
  @search_history
end

Instance Method Details

#backward_search ⇒ Object 



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# File 'lib/cless/cless.rb', line 523

def backward_search; search_prompt(:backward); end

#change_column_start_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 661

def change_column_start_prompt
  s = prebuff
  s = @display.prompt("First column: ") unless s
  return nil unless s
  @display.col_start = s.to_i
  true
end

#change_headers_to_line(i) ⇒ Object

Raises:



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# File 'lib/cless/cless.rb', line 506

def change_headers_to_line(i)
  raise Error, "Bad line number #{i}" if i < 1
  i_bak = @data.line + 1
  @data.goto_line(i)
  @data.cache_fill(1)
  line = nil
  @data.lines(1) { |l| line = l }
  @data.goto_line(i_bak)     # Go back
  raise Error, "No such line" unless line
  raise Error, "Ignored line: can't use" if line.kind_of?(IgnoredLine)
  @display.col_headers = line.onl_at(0..-1)
  @display.col_names = true
  true
end

#change_headers_to_line_content_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 459

def change_headers_to_line_content_prompt
  i = prebuff
  if i.nil?
    i = @data.line + 1
    s = @display.prompt("Header line: ", :init => i.to_s) or return nil
    s.strip!
    return "Bad line number #{s}" unless s =~ /^\d+$/
    i = s.to_i
  end
  begin
    change_headers_to_line(i)
  rescue => e
    return e.message
  end
  true
end

#change_padding_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 784

def change_padding_prompt
  s = @display.prompt("Padding: ") or return nil
  @display.padding = s
  true
end

#change_separator_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 778

def change_separator_prompt
  s = @display.prompt("Separator: ") or return nil
  @display.separator = s
  true
end

#change_split_pattern_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 726

def change_split_pattern_prompt
  s = @display.prompt("Split regexp(/#{@data.split_regexp}/): ")
  return "Not changed" if !s
  begin
    s.gsub!(%r{^/|/$}, '')
    regexp = s.empty? ? nil : Regexp.new(s)
  rescue => e
    return "Invalid regexp /#{s}/: #{e.message}"
  end
  @data.split_regexp = regexp
  "New split regexp: /#{regexp}/"
end

#color_descr ⇒ Object 



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# File 'lib/cless/cless.rb', line 565

def color_descr
  descr = @display.attr_names
  "Color: F %s B %s A %s" % 
    [descr[:foreground] || "-", descr[:background] || "-", descr[:attribute] || "-"]
end

#column_align_auto ⇒ Object 



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# File 'lib/cless/cless.rb', line 423

def column_align_auto; column_alignment(nil); end

#column_align_center ⇒ Object 



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# File 'lib/cless/cless.rb', line 422

def column_align_center; column_alignment(:center); end

#column_align_left ⇒ Object 



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# File 'lib/cless/cless.rb', line 420

def column_align_left; column_alignment(:left); end

#column_align_right ⇒ Object 



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# File 'lib/cless/cless.rb', line 421

def column_align_right; column_alignment(:right); end

#column_alignment(align) ⇒ Object 



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# File 'lib/cless/cless.rb', line 424

def column_alignment(align)
  i = prebuff
  a = i ? [i] : range_prompt("Columns to #{align || "auto"} align: ") or return nil
  return if a.empty?
  @display.col_align(align, a)
end

#column_format(cols, fmt) ⇒ Object 



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# File 'lib/cless/cless.rb', line 645

def column_format(cols, fmt)
  inc = @display.col_start
  if cols
    cols = cols.map { |x| x.to_i - inc }
    cols.delete_if { |x| x < 0 }
    if fmt && !fmt.empty?
      @data.set_format_column(fmt, *cols)
    else
      cols.each { |c| @data.unset_format_column(c) }
    end
    @data.refresh
  end
  cols = @data.formatted_column_list.sort.collect { |x| x + inc }
  "Formatted: " + cols.join(" ")
end

#column_format_inline(str) ⇒ Object 



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# File 'lib/cless/cless.rb', line 639

def column_format_inline(str)
  cols, fmt = str.split(/:/, 2)
  cols = str_to_range(cols)
  column_format(cols, fmt)
end

#column_format_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 629

def column_format_prompt
  i = prebuff
  cols = i ? [i] : range_prompt("Format columns: ") or return nil
  fmt = @display.prompt("Format string: ") or return nil
  fmt.strip!
  column_format(cols, fmt)
rescue => e
  return e.message
end

#column_offset_end ⇒ Object 



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# File 'lib/cless/cless.rb', line 380

def column_offset_end
  if prebuff && prebuff >= @display.col_start
    @offset_column = prebuff - @display.col_start
  end
  return if @offset_column.nil?
  @display.col_offsets[@offset_column] =
    [0, @data.sizes[@offset_column] - (@display.widths[@offset_column] || @display.col_width)].max
end

#column_offset_left ⇒ Object 



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# File 'lib/cless/cless.rb', line 371

def column_offset_left; column_offset_sideways(-1); end

#column_offset_right ⇒ Object 



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# File 'lib/cless/cless.rb', line 370

def column_offset_right; column_offset_sideways(1); end

#column_offset_sideways(dir) ⇒ Object 



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# File 'lib/cless/cless.rb', line 360

def column_offset_sideways(dir)
  if prebuff && prebuff >= @display.col_start
    @offset_column = prebuff - @display.col_start
  end
  return if @offset_column.nil?
  off = @display.col_offsets[@offset_column] || 0
  off = [off + dir, 0].max
  @display.col_offsets[@offset_column] = off
end

#column_offset_start ⇒ Object 



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# File 'lib/cless/cless.rb', line 372

def column_offset_start
  if prebuff && prebuff >= @display.col_start
    @offset_column = prebuff - @display.col_start
  end
  return if @offset_column.nil?
  @display.col_offsets[@offset_column] = 0
end

#column_width_change(x) ⇒ Object 



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# File 'lib/cless/cless.rb', line 440

def column_width_change(x)
  if prebuff && prebuff >= @display.col_start
    @offset_column = prebuff - @display.col_start
  end
  return if @offset_column.nil?
  w = (@display.widths[@offset_column] || @display.col_width) + x
  w = 5 if w < 5
  @display.widths[@offset_column] = w
end

#column_width_decrease ⇒ Object 



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# File 'lib/cless/cless.rb', line 451

def column_width_decrease; column_width_change(-1); end

#column_width_increase ⇒ Object 



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# File 'lib/cless/cless.rb', line 450

def column_width_increase; column_width_change(1); end

#column_width_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 431

def column_width_prompt
  i = prebuff
  a = i ? [i] : range_prompt("Width of columns: ") or return nil
  return nil if a.empty?
  s = @display.prompt("Max width: ") or return nil
  s = [s.to_i, 5].max
  a.map { |x| @display.widths[x] = s }
end

#display_help ⇒ Object 



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# File 'lib/cless/cless.rb', line 790

def display_help
  Ncurses.endwin
  Help.display
  true
rescue => e
  e.message
ensure
  Ncurses.refresh
end

#done ⇒ Object 



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# File 'lib/cless/cless.rb', line 108

def done; @done = true; end

#export_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 800

def export_prompt
  format = @display.prompt("Format: ") or return nil
  s = @display.prompt("Lines: ") or return nil
  ls, le = s.split.map { |x| x.to_i }
  file = @display.prompt("File: ") or return nil
  qs = Export.questions(format)
  opts = {}
  qs && qs.each { |k, pt, init|
    s = @display.prompt(pt + ": ", :init => init) or return nil
    opts[k] = s
  }
  len = Export.export(file, format, ls..le, @data, @display, opts)
  "Wrote #{len} bytes"
rescue => e
  return "Error: #{e.message}"
end

#forward_search ⇒ Object

Return a status if an error occur, otherwise, returns nil



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# File 'lib/cless/cless.rb', line 522

def forward_search; search_prompt(:forward); end

#goto_line(l) ⇒ Object 



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# File 'lib/cless/cless.rb', line 389

def goto_line(l)
  if l == 0
    return @data.goto_start ? "" : "Start of file"
  elsif l < 0
      @display.start_active_status("Skipping to end of file")
      return @data.goto_end ? "" : "End of file"
  else
    @display.start_active_status("Skipping to line #{l}")
    @data.goto_line(prebuff)
  end
  true
ensure
  @display.end_active_status
end

#goto_percent ⇒ Object 



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# File 'lib/cless/cless.rb', line 596

def goto_percent
  percent = prebuff or return true
  @data.goto_percent(percent)
end

#goto_position_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 601

def goto_position_prompt
  s = prebuff || @display.prompt("Goto: ") or return nil
  s = s.to_s.strip

  case s[-1]
  when "p", "%"
    s.slice!(-1)
    f = s.to_f
    return "Invalid percentage" if f <= 0.0 || f > 100.0
    @display.start_active_status("Goto %d%%" % f.round)
    @data.goto_percent(f)
  when "o"
    s.slice!(-1)
    i = s.to_i
    return "Invalid offset" if i < 0
    @display.start_active_status("Goto offset #{i}")
    @data.goto_offset(i)
  else
    i = s.to_i
    return "Invalid line number" if i <= 0
    @display.start_active_status("Goto line #{i}")
    @data.goto_line(i)
  end
  true
ensure
  @display.end_active_status
end

#hide_columns_prompt(show = false) ⇒ Object 



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# File 'lib/cless/cless.rb', line 405

def hide_columns_prompt(show = false)
  i = prebuff
  a = i ? [i] : range_prompt(show ? "Show: " : "Hide: ") or return nil
  if a.empty?
    @display.col_hide_clear
  else
    show ? @display.col_show(*a) : @display.col_hide(*a)
  end
  "Hidden: #{@display.col_hidden.join(" ")}"
rescue => e
  return e.message
end

#ignore_line(str) ⇒ Object 



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# File 'lib/cless/cless.rb', line 698

def ignore_line(str)
  ignore_line_list_each(str) do |spat, opat|
    if opat.nil? || !@data.add_ignore(opat)
      return "Bad pattern #{spat}"
    end
  end
  @data.refresh
  "Ignored: " + ignore_line_list_display(@data.ignore_pattern_list).join(" ")
end

#ignore_line_list_display(a) ⇒ Object 



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# File 'lib/cless/cless.rb', line 687

def ignore_line_list_display(a)
  a.collect { |x|
    o = case x
        when Range; (x.begin + 1)..(x.end + 1)
        when Integer; x + 1
        else x
        end
    o.inspect
  }
end

#ignore_line_list_each(str) ⇒ Object 



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# File 'lib/cless/cless.rb', line 675

def ignore_line_list_each(str)
  a = str.split_with_quotes('\s', '\/')
  a.each do |spat|
    opat = case spat
           when /^(\d+)(?:\.{2}|-)(\d+)$/; ($1.to_i - 1)..($2.to_i - 1)
           when /^(\d+)$/; $1.to_i - 1
           else Regexp.new(spat) rescue nil
           end
    yield(spat, opat)
  end
end

#ignore_line_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 669

def ignore_line_prompt
  s = @display.prompt("Ignore: ") or return nil
  s.strip!
  ignore_line(s)
end

#ignore_line_remove(str) ⇒ Object 



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# File 'lib/cless/cless.rb', line 714

def ignore_line_remove(str)
  if !str || str.empty?
    @data.remove_ignore(nil)
  else
    ignore_line_list_each(str) do |spat, opat|
      opat && @data.remove_ignore(opat)
    end
  end
  @data.refresh
  "Ignored: " + ignore_line_list_display(@data.ignore_pattern_list).join(" ")
end

#ignore_line_remove_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 708

def ignore_line_remove_prompt
  s = @display.prompt("Remove ignore: ") or return nil
  s.strip!
  ignore_line_remove(s)
end

#interrupt_reset ⇒ Object 



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# File 'lib/cless/cless.rb', line 110

def interrupt_reset; i, @interrupt = @interrupt, false; i; end

#interrupt_set ⇒ Object 



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# File 'lib/cless/cless.rb', line 109

def interrupt_set; @interrupt = true; end

#load_history(file) ⇒ Object 



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# File 'lib/cless/cless.rb', line 123

def load_history(file)
  tty = ttyname
  history = File.open(file, "r") { |fd|
    fd.flock(File::LOCK_SH)
    YAML::load(fd)
  }
  history = {} unless Hash === history
  history["tty"] = {} unless Hash === history["tty"]
  tty_history = history["tty"][tty] || history["tty"][history["recent_tty"]] || {}
  @search_history = tty_history["search"] || []
rescue Errno::EACCES
rescue Errno::ENOENT
end

#long_command ⇒ Object

This is a little odd. Does it belong to display more?



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# File 'lib/cless/cless.rb', line 267

def long_command
  sub = CommandSubWindow.new(Commands.keys.map { |s| s.size }.max)
  old_prompt_line = ""
  sub.new_list(Commands.keys.sort)
  extra = proc {
    if old_prompt_line != @display.prompt_line
      old_prompt_line = @display.prompt_line.dup
      reg = Regexp.new(Regexp.quote(old_prompt_line))
      sub.new_list(Commands.keys.grep(reg).sort)
      Ncurses.refresh
    end
  }
  other = proc { |ch|
    r = true
    case ch
    when NC::KEY_DOWN, C::CTRL_N; sub.next_item
    when NC::KEY_UP, C::CTRL_P; sub.previous_item
    else r = false
    end
    Ncurses.refresh if r
  }
  s = @display.prompt("Filter: ", :extra => extra, :other => other)
  sub.destroy
  @display.refresh
  self.__send__(Commands[sub.item]) if s
end

#main_loop ⇒ Object 



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# File 'lib/cless/cless.rb', line 158

def main_loop
  if @status.empty?
    @status = "Help? Press ~ or F1"
  end
  while !@done do
    @data.cache_fill(@display.nb_lines)
    @display.refresh
    wait_for_key or break
  end
end

#prebuff ⇒ Object 



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# File 'lib/cless/cless.rb', line 169

def prebuff; @prebuff.empty? ? nil : @prebuff.to_i; end

#range_prompt(prompt) ⇒ Object 



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# File 'lib/cless/cless.rb', line 306

def range_prompt(prompt)
  s = @display.prompt(prompt) or return nil
  str_to_range(s)
end

#regexp_line_highlight_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 739

def regexp_line_highlight_prompt
  s = @display.prompt("Highlight regexp(/#{@data.split_regexp}/): ")
  s.strip! if s
  if !s || s.empty?
    @data.highlight_regexp = nil
    return "No line highlight by regexp"
  end
  begin
    s.gsub!(%r{^/|/$}, '')
    regexp = s.empty? ? nil : Regexp.new(s)
  rescue => e
    return "Invalid regexp /#{s}/: #{e.message}"
  end
  @data.highlight_regexp = regexp
  "New highlight regexp: /#{regexp}/"
end

#repeat_search(reverse = false) ⇒ Object

Return a status if an error occur, otherwise, returns nil



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# File 'lib/cless/cless.rb', line 554

def repeat_search(reverse = false)
  return "No pattern" if !@data.pattern
  dir = if reverse 
          (@search_dir == :forward) ? :backward : :forward
        else 
          @search_dir
        end
  @data.repeat_search(dir) or return "Pattern not found!"
  true
end

#right_align_regexp_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 756

def right_align_regexp_prompt
  current = @display.right_align_re == LineDisplay::ISNUM ? "number" : @display.right_align_re.to_s
  s = @display.prompt("Right align regexp(/#{current}/): ")
  s.strip! if s
  if s.nil? || s.empty?
    @display.right_align_re = LineDisplay::ISNUM
    return "Automatic right alignment of numbers"
  elsif s == "//"
    @display.right_align_re = nil
    return "No automatic right alignment"
  end

  begin
    s.gsub!(%r{^/|/$}, '')
    regexp = Regexp.new(s)
  rescue => e
    return "Invalid regexp /#{s}/: #{e.message}"
  end
  @display.right_align_re = regexp
  "Automatic right alignment regexp: /#{regexp}/"
end

#save_file_prompt ⇒ Object 



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# File 'lib/cless/cless.rb', line 571

def save_file_prompt
  s = @display.prompt("Save to: ")
  return nil if !s || s.empty?
  if @data.file_path
    begin
      File.link(@data.file_path, s)
      return "Hard linked"
    rescue Errno::EXDEV => e
    rescue Exception => e
      return "Error: #{e.message}"
    end
  end

  # Got here, hard link failed. Copy by hand.
  nb_bytes = nil
  begin
    File.open(s, File::WRONLY|File::CREAT|File::EXCL) do |fd|
      nb_bytes = @data.write_to(fd)
    end
  rescue Exception => e
    return "Error: #{e.message}"
  end
  "Wrote #{nb_bytes} bytes"
end

#save_history(file) ⇒ Object 



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# File 'lib/cless/cless.rb', line 137

def save_history(file)
  tty = ttyname
  File.open(file, File::RDWR|File::CREAT, 0644) { |fd|
    fd.flock(File::LOCK_EX)

    history = YAML::load(fd)
    history = {} unless Hash === history
    history["tty"] = {} unless Hash === history["tty"]
    history["tty"][tty] = {} unless Hash === history["tty"][tty]
    history["tty"][tty]["search"] = @search_history
    history["recent_tty"] = tty

    fd.rewind
    fd.print(history.to_yaml)
    fd.flush
    fd.truncate(fd.pos)
  }
rescue Errno::EACCES
rescue Errno::ENOENT
end

#scroll_backward_full_screen(save = false) ⇒ Object 



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# File 'lib/cless/cless.rb', line 339

def scroll_backward_full_screen(save = false)
  @full_screen_lines = prebuff if save && prebuff
  @data.scroll(-(prebuff || @full_screen_lines || (@display.nb_lines - 1)))
  true
end

#scroll_backward_half_screen(save = false) ⇒ Object 



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# File 'lib/cless/cless.rb', line 327

def scroll_backward_half_screen(save = false)
  @half_screen_lines = prebuff if save && prebuff
  @data.scroll(-(prebuff || @half_screen_lines || (@display.nb_lines / 2)))
  true
end

#scroll_backward_line ⇒ Object 



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# File 'lib/cless/cless.rb', line 316

def scroll_backward_line
  @data.scroll(-(prebuff || 1))
  true
end

#scroll_forward_full_screen(save = false) ⇒ Object 



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# File 'lib/cless/cless.rb', line 333

def scroll_forward_full_screen(save = false)
  @full_screen_lines = prebuff if save && prebuff
  @data.scroll(prebuff || @full_screen_lines || (@display.nb_lines - 1))
  true
end

#scroll_forward_half_screen(save = false) ⇒ Object 



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# File 'lib/cless/cless.rb', line 321

def scroll_forward_half_screen(save = false)
  @half_screen_lines = prebuff if save && prebuff
  @data.scroll(prebuff || @half_screen_lines || (@display.nb_lines / 2))
  true
end

#scroll_forward_line ⇒ Object 



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# File 'lib/cless/cless.rb', line 311

def scroll_forward_line
  @data.scroll(prebuff || 1)
  true
end

#scroll_left ⇒ Object 



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# File 'lib/cless/cless.rb', line 357

def scroll_left; scroll_sideways(-1); end

#scroll_right ⇒ Object 



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# File 'lib/cless/cless.rb', line 358

def scroll_right; scroll_sideways(1); end

#scroll_sideways(dir) ⇒ Object 



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# File 'lib/cless/cless.rb', line 345

def scroll_sideways(dir)
  @scroll_columns = prebuff if prebuff
  to_scroll = @scroll_columns || 1
  st_col = @display.st_col
  to_scroll.times { |i|
    st_col += dir
    redo if @display.col_hidden(false).index(st_col)
  }
  @display.st_col = st_col
  true
end

#search_prompt(dir = :forward) ⇒ Object 



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# File 'lib/cless/cless.rb', line 524

def search_prompt(dir = :forward)
  s = @display.prompt("%s Search: " % 
                        [(dir == :forward) ? "Forward" : "Backward"],
                      { :history => @search_history })
  s or return nil
  if s =~ /^\s*$/
    @data.search_clear
  else
    begin
      @display.start_active_status("Searching '#{s}'")

      hist_index = @search_history.index(s)
      @search_history.slice!(hist_index) if hist_index
      @search_history.unshift(s)
      @search_history = @search_history[0, @max_search_history]
      begin
        @search_dir = dir
        pattern = Regexp.new(s)
        @data.search(pattern, dir) or return "Pattern not found!"
      rescue RegexpError => e
      return "Bad attr_reader :egexp: #{e.message}"
      end
    ensure
      @display.end_active_status
    end
  end
  true
end

#shift_column_highlight ⇒ Object 



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# File 'lib/cless/cless.rb', line 498

def shift_column_highlight
  if i = prebuff
    @display.col_highlight_shift = i
  else
    @display.col_highlight_shift += 1
  end
end

#shift_line_highlight ⇒ Object 



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# File 'lib/cless/cless.rb', line 490

def shift_line_highlight
  if i = prebuff
    @display.line_highlight_shift = i
  else
    @display.line_highlight_shift += 1
  end
end

#show_hide_headers ⇒ Object 



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# File 'lib/cless/cless.rb', line 453

def show_hide_headers
  return "No names defined" if !@display.col_names && !@display.col_headers
  @display.col_names = !@display.col_names
  true
end

#str_to_range(str) ⇒ Object 



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# File 'lib/cless/cless.rb', line 294

def str_to_range(str)
  str.split_with_quotes().map { |r|
    case r
    when /^(\d+)$/
      $1.to_i
    when /^(\d+)(?:\.{2,3}|-)(\d+)$/
      (($1.to_i)..($2.to_i)).to_a
    else raise "Invalid range: #{r}"
    end
  }.flatten
end

#toggle_column_highlight ⇒ Object 



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# File 'lib/cless/cless.rb', line 483

def toggle_column_highlight
  i = prebuff
  @display.col_highlight = !@display.col_highlight
  @display.col_highlight_period = i if i
  true
end

#toggle_hide_ignored ⇒ Object 



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# File 'lib/cless/cless.rb', line 418

def toggle_hide_ignored; @display.hide_ignored = !@display.hide_ignored; end

#toggle_line_highlight ⇒ Object 



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# File 'lib/cless/cless.rb', line 476

def toggle_line_highlight
  i = prebuff
  @display.line_highlight = !@display.line_highlight
  @display.line_highlight_period = i if i
  true
end

#ttyname ⇒ Object 



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# File 'lib/cless/cless.rb', line 112

def ttyname
  [Proc.new { File.readlink("/proc/self/fd/0") },
   Proc.new { `tty`.chomp }].each { |m|
    begin
      return m.call
    rescue Errno::ENOENT
    end
  }
  return "/dev/unknown"
end

#unhide_columns ⇒ Object 



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# File 'lib/cless/cless.rb', line 404

def unhide_columns; hide_columns_prompt(true); end

#wait_for_key ⇒ Object 



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# File 'lib/cless/cless.rb', line 171

def wait_for_key
  status = nil
  esc = false
  while !@done do
    nc = false        # Set to true if no data change
    data_fd = @data.select_fd(@display.nb_lines)
    prompt = data_fd ? "+:" : ":"
    @display.wait_status(@status, prompt + @prebuff)
    if data_fd
      @display.flush
      in_fds = select([$stdin, data_fd])
      if in_fds[0].include?(data_fd)
        status = :more
        nc = true
        break
      end
    end

    k = Ncurses.getch
    status = 
      case k
      when NC::KEY_DOWN, NC::KEY_ENTER, C::CTRL_N, ?e.ord, C::CTRL_E, ?j.ord, C::CTRL_J, ?\n.ord, ?\r.ord
        scroll_forward_line
      when NC::KEY_UP, ?y.ord, C::CTRL_Y, C::CTRL_P, ?k.ord, C::CTRL_K
        scroll_backward_line
      when ?d.ord, C::CTRL_D; scroll_forward_half_screen(true)
      when ?u.ord, C::CTRL_U; scroll_backward_half_screen(true)
      when C::SPACE, NC::KEY_NPAGE, C::CTRL_V, ?f.ord, C::CTRL_F; scroll_forward_full_screen
      when ?z.ord; scroll_forward_full_screen(true)
      when NC::KEY_PPAGE, ?b.ord, C::CTRL_B; scroll_backward_full_screen
      when ?w.ord; scroll_backward_full_screen(true)
      when NC::KEY_HOME, ?g.ord, ?<.ord; goto_line(0)
      when NC::KEY_END, ?G.ord, ?>.ord; goto_line(-1)
      when NC::KEY_LEFT; scroll_left
      when NC::KEY_RIGHT; scroll_right
      when ?+.ord; @display.col_space += 1; true
      when ?-.ord; @display.col_space -= 1; true
      when ?F.ord; goto_position_prompt
      when ?v.ord; column_format_prompt
      when ?i.ord; ignore_line_prompt
      when ?I.ord; ignore_line_remove_prompt
      when ?o.ord; toggle_line_highlight
      when ?O.ord; toggle_column_highlight
      when ?m.ord; shift_line_highlight
      when ?M.ord; shift_column_highlight
      when ?c.ord; @display.column = !@display.column; true
      when ?l.ord; @display.line = !@display.line; true
      when ?L.ord; @display.line_offset = !@display.line_offset; true
      when ?h.ord; hide_columns_prompt
      when ?H.ord; hide_columns_prompt(:show)
      when ?A.ord; column_alignment(:right)
      when ?a.ord; column_alignment(:left)
      when ?`.ord; change_column_start_prompt
      when ?).ord; esc ? scroll_right : column_width_increase
      when ?(.ord; esc ? scroll_left : column_width_decrease
      when ?/.ord; search_prompt(:forward)
      when ??.ord; search_prompt(:backward)
      when ?n.ord; repeat_search
      when ?N.ord; repeat_search(true)
      when ?s.ord; save_file_prompt
      when ?S.ord; change_split_pattern_prompt
      when ?E.ord; export_prompt
      when ?t.ord; show_hide_headers
      when ?p.ord, ?%.ord; goto_percent
      when ?|.ord; change_separator_prompt
      when ?\\.ord; change_padding_prompt
      when ?^.ord; change_headers_to_line_content_prompt
      when ?r.ord, ?R.ord, C::CTRL_R, C::CTRL_L; @data.clear_cache; NC::endwin; NC::doupdate
      when NC::KEY_RESIZE; nc = true # Will break to refresh display
      when NC::KEY_F1, ?~.ord; display_help
      when (?0.ord)..(?9.ord); @prebuff += k.chr; next
      when NC::KEY_BACKSPACE, ?\b.ord; esc ? @prebuff = "" : @prebuff.chop!; next
      when ?:.ord; long_command
      when ?q.ord; return nil
      when C::ESC; esc = true; next
      when NC::KEY_SLEFT, ?[.ord; column_offset_left
      when NC::KEY_SRIGHT, ?].ord; column_offset_right
      when ?{.ord; column_offset_start
      when ?}.ord; column_offset_end
      else next
      end
    break
  end
  
  @prebuff = "" unless nc
  @status = 
    case status
    when String; status
    when nil; "Cancelled"
    when :more; @status
    else ""
    end
  return true
end