Module: Canis::Io

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

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/canis/core/include/io.rb', line 26

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

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



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# File 'lib/canis/core/include/io.rb', line 256

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 (Integer) —

    length of field

Returns:

  • (String) —

    filename or blank if user cancelled

See Also:



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

def get_file prompt, config={}  #:nodoc:
  maxlen = 70
  tabc = Proc.new {|str| Dir.glob(str +"*") }
  config[:tab_completion] ||= tabc
  config[:maxlen] ||= maxlen
  #config[:default] = "test"
  #ret, str = rb_getstr(nil,0,0, prompt, maxlen, config)
  # 2014-04-25 - 12:42 removed call to deprecated method
  str = rb_gets(prompt, config)
  #$log.debug " get_file returned #{ret} , #{str} "
  str ||= ""
  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:



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# File 'lib/canis/core/include/io.rb', line 270

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 = {}) ⇒ Integer

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:

  • (Integer) —

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



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# File 'lib/canis/core/include/io.rb', line 188

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 rb_getstr #{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, :width 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/canis/core/include/io.rb', line 39

def rb_gets(prompt, config={}) # yield field
  if config.is_a? Hash
    # okay
    #
  elsif config.is_a? Array
    # an array is supplied, and tabbing helps complete from that
    # array.
    options = config
    completion_proc = Proc.new{|str| 
      options.dup.grep Regexp.new("^#{str}");
    }
    config = {}
    config[:tab_completion] = completion_proc
  elsif config == Pathname
    # we need to return a pathname TODO and prepend dirname
    # allow user to specify startdir else take current
    completion_proc = Proc.new {|str| Dir.glob(str +"*").collect { |f| File.directory?(f) ? f+"/" : f  } }
    help_text = "Enter start of filename and tab to get completion"
    config = {}
    config[:tab_completion] = completion_proc
    config[:help_text] = help_text
  elsif config == Integer
    config = {}
    config[:datatype] = 1.class
    config[:type] = :integer
  elsif config == Float
    config = {}
    v = 0.11
    config[:datatype] = v.class
    config[:type] = :float
  elsif config == :phone

    config = {}
  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[:width] || [config[:maxlen] || 999, _max].min
    maxlen = config[:maxlen] || _max
    field = LabeledField.new form, :row => r, :col => c, :maxlen => maxlen, :default => default, :label => prompt,
      :width => displen
    field.datatype(config[:datatype]) if config[:datatype]
    field.type(config[:type]) if config[:type]
    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
    require 'canis/core/include/rhistory'
    field.extend(FieldHistory)
    field.history = config[:history]

    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)
      if ch == 10 || ch == 13 || ch == KEY_ENTER
        begin
          # validate in case ranges or other validation given
          field.on_leave
          break
        rescue FieldValidationException => err # added 2011-10-2 v1.3.1 so we can rollback
          #alert err.to_s
          # unable to use alert now, since closing alert repaints root window and clears the
          # window this was on (command window in numbered menu).
          print_this(win, err.to_s, $errorcolor, 1, 0)
          form.setpos
        rescue => err
          Ncurses.beep
          break
        end
      end
      #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
      # 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
          # tab_completion
          # if previous char was not tab, execute tab_completion_proc and push first entry
          # else push the next entry
          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

      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 rb_getstr #{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

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

Deprecated.

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 NOTE : This method is now only for **backward compatibility** rb_getstr had various return codes based on whether user asked for help possibly mimicking alpine, or because i could do nothing about it. Now, rb_getstr handles that and only returns if the user cancels or enters a string, so rb_getstr does not need to return other codes.

Parameters:

  • prompt (String) —

    • label to show

  • maxlen (Integer) —

    • max length of input

  • config (Hash) (defaults to: {}) —

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



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# File 'lib/canis/core/include/io.rb', line 307

def rb_getstr(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/canis/core/include/io.rb', line 287

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