Module: RubyCurses::Io

Included in:
ActionManager, PromptMenu, Widget, WidgetMenu
Defined in:
lib/rbcurse/core/include/io.rb

Defined Under Namespace

Classes: CMenuItem, PromptMenu

Instance Method Summary collapse

Instance Method Details

#__create_footer_window(h = 2, w = Ncurses.COLS, t = Ncurses.LINES-2, l = 0) ⇒ Object

create a 2 line window at bottom to accept user input



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# File 'lib/rbcurse/core/include/io.rb', line 18

def __create_footer_window h = 2 , w = Ncurses.COLS, t = Ncurses.LINES-2, l = 0
  ewin = VER::Window.new(h, w , t, l)
end

#clear_this(win, r, c, color, len) ⇒ Object 



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# File 'lib/rbcurse/core/include/io.rb', line 229

def clear_this win, r, c, color, len
  print_this(win, "%-*s" % [len," "], color, r, c)
end

#get_file(prompt, config = {}) ⇒ String

This is just experimental, trying out tab_completion Prompt user for a file name, allowing him to tab to complete filenames

Parameters:

  • label (String) —

    to print before field

  • max (Fixnum) —

    length of field

Returns:

  • (String) —

    filename or blank if user cancelled



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# File 'lib/rbcurse/core/include/io.rb', line 219

def get_file prompt, config={}  #:nodoc:
  maxlen = 70
  tabc = Proc.new {|str| Dir.glob(str +"*") }
  config[:tab_completion] ||= tabc
  #config[:default] = "test"
  ret, str = rbgetstr(nil,0,0, prompt, maxlen, config)
  #$log.debug " get_file returned #{ret} , #{str} "
  return "" if ret != 0
  return str
end

#print_this(win, text, color, x, y) ⇒ Object

prints given text to window, in color at x and y coordinates

Parameters:

  • window (Window) —

    to write to

  • text (String) —

    to print

  • color (int) —

    pair such as $datacolor or $promptcolor

  • x (int) —

    row

  • y (int) —

    col

See Also:

  • Window#printstring


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# File 'lib/rbcurse/core/include/io.rb', line 243

def print_this(win, text, color, x, y)
  raise "win nil in print_this" unless win
  color=Ncurses.COLOR_PAIR(color);
  win.attron(color);
  #win.mvprintw(x, y, "%-40s" % text);
  win.mvprintw(x, y, "%s" % text);
  win.attroff(color);
  win.refresh
end

#rb_getchar(prompt, config = {}) ⇒ Fixnum

get a character. unlike rb_gets allows user to enter control or alt or function character too. If default provided, then ENTER returns the default

Parameters:

  • prompt (String) —

    or label to show.

  • configuration (Hash) —

    such as default or regexp for validation

Returns:

  • (Fixnum) —

    nil if canceled, or ret value of getchar which is numeric



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# File 'lib/rbcurse/core/include/io.rb', line 165

def rb_getchar(prompt, config={}) # yield field
  begin
    win = __create_footer_window
    #form = Form.new win
    r = 0; c = 1;
    default = config[:default] 
    prompt = "#{prompt} [#{default}] " if default
    win.mvprintw(r, c, "%s: " % prompt);
    bg = Ncurses.COLORS >= 236 ? 236 : :blue
    color_pair = get_color($reversecolor, :white, bg)
    win.printstring r, c + prompt.size + 2, " ", color_pair

    win.wrefresh
    prevchar = 0
    entries = nil
    while ((ch = win.getchar()) != 999)
      return default.ord if default && (ch == 13 || ch == KEY_ENTER)
      return nil if ch == ?\C-c.getbyte(0) || ch == ?\C-g.getbyte(0)
      if ch == KEY_F1
        help_text = config[:help_text] || "No help provided. C-c/C-g aborts."
        print_status_message help_text, :wait => 7
        win.wrefresh # nevr had to do this with ncurses, but have to with ffi-ncurses ??
        next
      end
      if config[:regexp]
        reg = config[:regexp]
        if ch > 0 && ch < 256
          chs = ch.chr
          return ch if chs =~ reg
          alert "Wrong character. #{reg} "
        else
          alert "Wrong character. #{reg} "
        end
      else
        return ch
      end
      #form.handle_key ch
      win.wrefresh
    end
  rescue => err
    Ncurses.beep
    $log.error "EXC in rbgetsr #{err} "
    $log.error(err.backtrace.join("\n")) 
  ensure
    win.destroy if win
  end
  return nil
end

#rb_gets(prompt, config = {}) {|Field| ... } ⇒ String?

get a string at the bottom of the screen

help_text is displayed on F1 tab_completion is a proc which helps to complete user input

Parameters:

  • prompt (String) —

    • label to show

  • config (Hash) (defaults to: {}) —

    • :default, :display_length of Field, :help_text, :tab_completion

Yields:

  • (Field) —

    for overriding or customization

Returns:

  • (String, nil) —

    String if entered, nil if canceled



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# File 'lib/rbcurse/core/include/io.rb', line 54

def rb_gets(prompt, config={}) # yield field
  if config.is_a? Array
    options = config
    completion_proc = Proc.new{|str| 
      options.dup.grep Regexp.new("^#{str}");
    }
    config = {}
    config[:tab_completion] = completion_proc
  end
  begin
    win = __create_footer_window
    form = Form.new win
    r = 0; c = 1;
    default = config[:default] || ""
    prompt = "#{prompt} [#{default}]:" if default.size > 0
    _max = FFI::NCurses.COLS-1-prompt.size-4
    displen = config[:display_length] || [config[:maxlen] || 999, _max].min
    maxlen = config[:maxlen] || _max
    field = Field.new form, :row => r, :col => c, :maxlen => maxlen, :default => default, :label => prompt,
      :display_length => displen
    bg = Ncurses.COLORS >= 236 ? 233 : :blue
    field.bgcolor = bg
    field.cursor_end if default.size > 0
    def field.default=(x); default(x);end

    # if user wishes to use the yield and say "field.history = [x,y,z] then
    # we should alredy have extended this, so lets make it permanent
    #if config[:history]
    #raise ArgumentError, "Field history must be an array" unless config[:history].is_a? Array
    require 'rbcurse/core/include/rhistory'
    field.extend(FieldHistory)
    #field.history_config :row => 
    field.history = config[:history]
    #end

    yield field if block_given?
    form.repaint
    win.wrefresh
    prevchar = 0
    entries = nil
    oldstr = nil # for tab completion, origal word entered by user
    while ((ch = win.getchar()) != 999)
      break if ch == 10 || ch == 13 || ch == KEY_ENTER
      #return -1, nil if ch == ?\C-c.getbyte(0) || ch == ?\C-g.getbyte(0)
      return nil if ch == ?\C-c.getbyte(0) || ch == ?\C-g.getbyte(0)
      #if ch == ?\M-h.getbyte(0) #                            HELP KEY
      #help_text = config[:help_text] || "No help provided"
      #color = $datacolor
      #print_help(win, r, c, color, help_text)
      ## this will come over our text
      #end
      # TODO tab completion and help_text print on F1
      # that field objects can extend, same for tab completion and gmail completion
      if ch == KEY_TAB
        if config
          str = field.text
          if prevchar == KEY_TAB
            if !entries.nil? && !entries.empty?
              str = entries.delete_at(0)
            else
              str = oldstr if oldstr
              prevchar = ch = nil # so it can start again completing
            end
          else
            tabc = config[:tab_completion] unless tabc
            next unless tabc
            oldstr = str.dup
            entries = tabc.call(str).dup
            $log.debug " tab got #{entries} for str=#{str}"
            str = entries.delete_at(0) unless entries.nil? || entries.empty?
            str = str.to_s.dup
          end
          if str
            field.text = str
            field.cursor_end
            field.set_form_col # shit why are we doign this, text sets curpos to 0
          end
          form.repaint
          win.wrefresh
        end

        # tab_completion
        # if previous char was not tab, execute tab_completion_proc and push first entry
        # else push the next entry
      elsif ch == KEY_F1
        help_text = config[:help_text] || "No help provided. C-c/C-g aborts. <TAB> completion. Alt-h history. C-a/e"
        print_status_message help_text, :wait => 7
      else
        form.handle_key ch
      end
      prevchar = ch
      win.wrefresh
    end
  rescue => err
    Ncurses.beep
    textdialog [err.to_s, *err.backtrace], :title => "Exception"
    $log.error "EXC in rbgetsr #{err} "
    $log.error(err.backtrace.join("\n")) 
  ensure
    win.destroy if win
  end
  config[:history] << field.text if config[:history] && field.text
  return field.text
end

#rbgetstr(nolongerused, r, c, prompt, maxlen, config = {}) ⇒ Object

routine to get a string at bottom of window. The first 3 params are no longer required since we create a window of our own. help_text is displayed on F1 tab_completion is a proc which helps to complete user input This method is now only for backward compatibility rbgetstr had various return codes based on whether user asked for help possibly mimicking alpine, or because i could do nothing about it. Now, rbgets handles that and only returns if the user cancels or enters a string, so rbgets does not need to return other codes.

Parameters:

  • prompt (String) —

    • label to show

  • maxlen (Fixnum) —

    • max length of input

  • config (Hash) (defaults to: {}) —

    • :default, :display_length of Field, :help_text, :tab_completion



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# File 'lib/rbcurse/core/include/io.rb', line 36

def rbgetstr(nolongerused, r, c, prompt, maxlen, config={})
  config[:maxlen] = maxlen
  str = rb_gets(prompt, config)
  if str
    return 0, str
  else
    return -1, nil
  end
end

#warn(string) ⇒ Object

warn user: currently flashes and places error in log file experimental, may change interface later it does not say anything on screen

Parameters:

  • text (String) —

    of error/warning to put in log

Since:

  • 1.1.5



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# File 'lib/rbcurse/core/include/io.rb', line 260

def warn string
  $log.warn string
  Ncurses.beep
end