Class: Rcurses::Pane

Inherits:
Object
  • Object
show all
Includes:
Cursor, Input
Defined in:
lib/rcurses/pane.rb

Direct Known Subclasses

Popup

Constant Summary

Constants included from Cursor

Cursor::CSI, Cursor::ESC

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Input

#getchr

Methods included from Cursor

clear_char, clear_line, clear_line_after, clear_line_before, clear_screen_down, col, colget, down, hide, left, next_line, pos, prev_line, restore, right, row, rowget, save, scroll_down, scroll_up, set, show, up

Constructor Details

#initialize(x = 1, y = 1, w = 1, h = 1, fg = nil, bg = nil) ⇒ Pane 



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# File 'lib/rcurses/pane.rb', line 19

def initialize(x = 1, y = 1, w = 1, h = 1, fg = nil, bg = nil)
  @max_h, @max_w = IO.console ? IO.console.winsize : [24, 80]
  @x          = x
  @y          = y
  @w          = w
  @h          = h
  @fg, @bg    = fg, bg
  @text       = ""     # Initialize text variable
  @align      = "l"    # Default alignment
  @scroll     = true   # Enable scroll indicators
  @prompt     = ""     # Prompt for editline
  @ix         = 0      # Starting text line index
  @prev_frame = nil    # Holds the previously rendered frame (array of lines)
  @line       = 0      # For cursor tracking during editing:
  @pos        = 0      # For cursor tracking during editing:
  @record     = false  # Don't record history unless explicitly set to true
  @history    = []     # History array
  @max_history_size = 100  # Limit history to prevent memory leaks
  @scroll_fg  = nil    # Scroll indicator color (defaults to @fg)
  @multiline_buffer = []   # Buffer to store lines from multi-line paste
  @update     = true   # When false, refresh is a no-op
  @emoji      = false  # Opt-in: C-E opens emoji picker in editline
  @emoji_refresh = nil  # Optional lambda to redraw UI after emoji picker

  ObjectSpace.define_finalizer(self, self.class.finalizer_proc)
end

Instance Attribute Details

#align ⇒ Object

Returns the value of attribute align.



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# File 'lib/rcurses/pane.rb', line 11

def align
  @align
end

#bg ⇒ Object

Returns the value of attribute bg.



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# File 'lib/rcurses/pane.rb', line 10

def bg
  @bg
end

#border ⇒ Object

Returns the value of attribute border.



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# File 'lib/rcurses/pane.rb', line 11

def border
  @border
end

#emoji ⇒ Object

Returns the value of attribute emoji.



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# File 'lib/rcurses/pane.rb', line 16

def emoji
  @emoji
end

#emoji_refresh ⇒ Object

Optional callback to redraw UI after emoji picker closes



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# File 'lib/rcurses/pane.rb', line 17

def emoji_refresh
  @emoji_refresh
end

#fg ⇒ Object

Returns the value of attribute fg.



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# File 'lib/rcurses/pane.rb', line 10

def fg
  @fg
end

#h ⇒ Object

Returns the value of attribute h.



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# File 'lib/rcurses/pane.rb', line 9

def h
  @h
end

#history ⇒ Object

Returns the value of attribute history.



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# File 'lib/rcurses/pane.rb', line 13

def history
  @history
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/rcurses/pane.rb', line 11

def index
  @index
end

#ix ⇒ Object

Returns the value of attribute ix.



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# File 'lib/rcurses/pane.rb', line 11

def ix
  @ix
end

#moredown ⇒ Object

Returns the value of attribute moredown.



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# File 'lib/rcurses/pane.rb', line 12

def moredown
  @moredown
end

#moreup ⇒ Object

Returns the value of attribute moreup.



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# File 'lib/rcurses/pane.rb', line 12

def moreup
  @moreup
end

#multiline_buffer ⇒ Object

Returns the value of attribute multiline_buffer.



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# File 'lib/rcurses/pane.rb', line 14

def multiline_buffer
  @multiline_buffer
end

#prompt ⇒ Object

Returns the value of attribute prompt.



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# File 'lib/rcurses/pane.rb', line 11

def prompt
  @prompt
end

#record ⇒ Object

Returns the value of attribute record.



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# File 'lib/rcurses/pane.rb', line 13

def record
  @record
end

#scroll ⇒ Object

Returns the value of attribute scroll.



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# File 'lib/rcurses/pane.rb', line 11

def scroll
  @scroll
end

#scroll_fg ⇒ Object

Returns the value of attribute scroll_fg.



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# File 'lib/rcurses/pane.rb', line 9

def scroll_fg
  @scroll_fg
end

#text ⇒ Object

Returns the value of attribute text.



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# File 'lib/rcurses/pane.rb', line 11

def text
  @text
end

#update ⇒ Object

Returns the value of attribute update.



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# File 'lib/rcurses/pane.rb', line 15

def update
  @update
end

#w ⇒ Object

Returns the value of attribute w.



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# File 'lib/rcurses/pane.rb', line 9

def w
  @w
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/rcurses/pane.rb', line 9

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/rcurses/pane.rb', line 9

def y
  @y
end

Class Method Details

.finalizer_proc ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 109

def self.finalizer_proc
  proc do
    # Cleanup code that doesn't reference instance variables
    # since the object is already being finalized
  end
end

Instance Method Details

#ask(prompt, text) ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 73

def ask(prompt, text)
  @prompt = prompt
  @text   = text
  editline
  if @record && !@text.empty?
    @history << @text
    @history.shift while @history.size > @max_history_size
  end
  @text
end

#border_refresh ⇒ Object

Refresh only the border



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# File 'lib/rcurses/pane.rb', line 164

def border_refresh
  left_col   = @x - 1
  right_col  = @x + @w
  top_row    = @y - 1
  bottom_row = @y + @h

  if @border
    tl, tr, bl, br, h, v = border_chars

    fmt = [@fg.to_s, @bg.to_s].join(',')
    top = (tl + h * @w + tr).c(fmt)
    STDOUT.print "\e[#{top_row};#{left_col}H" + top
    (0...@h).each do |i|
      row = @y + i
      STDOUT.print "\e[#{row};#{left_col}H"  + v.c(fmt)
      STDOUT.print "\e[#{row};#{right_col}H" + v.c(fmt)
    end
    bottom = (bl + h * @w + br).c(fmt)
    STDOUT.print "\e[#{bottom_row};#{left_col}H" + bottom
  else
    STDOUT.print "\e[#{top_row};#{left_col}H" + " " * (@w + 2)
    (0...@h).each do |i|
      row = @y + i
      STDOUT.print "\e[#{row};#{left_col}H"  + " "
      STDOUT.print "\e[#{row};#{right_col}H" + " "
    end
    STDOUT.print "\e[#{bottom_row};#{left_col}H" + " " * (@w + 2)
  end
end

#bottom ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 147

def bottom
  @ix = line_count - @h
  refresh
end

#cleanup ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 100

def cleanup
  @prev_frame = nil
  @lazy_txt = nil
  @raw_txt = nil
  @cached_text = nil
  @txt = nil
  @history.clear if @history
end

#clear ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 94

def clear
  @text = ""
  @ix   = 0
  full_refresh 
end

#down ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 470

def down
  if @line == @h - 1
    @ix += 1 unless @ix + @line >= @txt.length - 1
  elsif @line + @ix + 1 < @txt.length
    @line += 1
  end
  @pos = [@pos, @txt[@ix + @line]&.length || 0].min
end

#edit ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 491

def edit
  begin
    STDIN.cooked!  rescue nil
    STDIN.echo = true rescue nil
    # Prepare content with visible newline markers
    content = @text.pure.gsub("\n", "¬\n")
    # Reset editing cursor state
    @ix = 0
    @line = 0
    @pos = 0
    # Initial render sets @txt internally for display and cursor math
    refresh(content)
    Rcurses::Cursor.show
    input_char = ''

    while input_char != 'ESC'
      # Move the terminal cursor to the logical text cursor
      row(@y + @line)
      # Calculate display width up to cursor position on current line
      current_line_text = @txt[@ix + @line] || ""
      display_pos = @pos > 0 ? Rcurses.display_width(current_line_text.pure[0...@pos]) : 0
      col(@x + display_pos)
      input_char = getchr(flush: false)
      case input_char
      when 'C-L'
        @align = 'l'
      when 'C-R'
        @align = 'r'
      when 'C-C'
        @align = 'c'
      when 'C-Y'
        Clipboard.copy(@text.pure)
      when 'C-S'
        content = content.gsub('¬', "\n")
        content = parse(content)
        @text = content
        input_char = 'ESC'
      when 'DEL'
        posx = calculate_posx
        content.slice!(posx)
      when 'BACK'
        if @pos > 0
          left
          posx = calculate_posx
          content.slice!(posx)
        end
      when 'WBACK'
        while @pos > 0 && content[calculate_posx - 1] != ' '
          left
          posx = calculate_posx
          content.slice!(posx)
        end
      when 'C-K'
        line_start_pos = calculate_line_start_pos
        line_length = @txt[@ix + @line]&.length || 0
        content.slice!(line_start_pos + @pos, line_length - @pos)
      when 'UP'
        up
      when 'DOWN'
        down
      when 'RIGHT'
        right
      when 'LEFT'
        left
      when 'HOME'
        @pos = 0
      when 'END'
        current_line_length = @txt[@ix + @line]&.length || 0
        @pos = current_line_length
      when 'C-HOME'
        @ix = 0; @line = 0; @pos = 0
      when 'C-END'
        total_lines = @txt.length
        @ix = [total_lines - @h, 0].max
        @line = [@h - 1, total_lines - @ix - 1].min
        current_line_length = @txt[@ix + @line]&.length || 0
        @pos = current_line_length
      when 'ENTER'
        posx = calculate_posx
        content.insert(posx, "¬\n")
        right
      when /^.$/
        posx = calculate_posx
        content.insert(posx, input_char)
        right
      end

      # Handle any buffered input (multi-line paste)
      while IO.select([$stdin], nil, nil, 0)
        input_char = $stdin.read_nonblock(1) rescue nil
        break unless input_char
        # ESC byte starts an escape sequence (arrow key, etc.)
        # Push it back for getchr to parse properly on next iteration
        if input_char == "\e"
          $stdin.ungetbyte(0x1b)
          break
        end
        posx = calculate_posx
        content.insert(posx, input_char)
        right
      end

      # Re-render without overwriting the internal @txt
      refresh(content)
      Rcurses::Cursor.show
    end
  ensure
    STDIN.raw!         rescue nil  
    STDIN.echo = false rescue nil
    while IO.select([$stdin], nil, nil, 0)
      $stdin.read_nonblock(4096) rescue break
    end
  end
  Rcurses::Cursor.hide
end

#editline ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 607

def editline
  begin
    STDIN.cooked!  rescue nil
    STDIN.echo = true rescue nil
    Rcurses::Cursor.show
    @x = [[@x, 1].max, @max_w - @w + 1].min
    @y = [[@y, 1].max, @max_h - @h + 1].min
    @scroll = false
    @ix = 0
    row(@y)
    fmt = [@fg.to_s, @bg.to_s].join(',')
    col(@x)
    print @prompt.c(fmt)
    prompt_len = @prompt.pure.length
    content_len = @w - prompt_len
    return nil if content_len < 1
    cont = @text.pure.slice(0, content_len)
    @pos = cont.length
    chr = ''
    history_index = @history.size
    @multiline_buffer = []  # Clear buffer at start of input

    while chr != 'ESC'
      row(@y)
      col(@x + prompt_len)
      # Truncate content to fit display width
      disp_w = Rcurses.display_width(cont)
      while disp_w > content_len && cont.length > 0
        cont = cont[0..-2]
        disp_w = Rcurses.display_width(cont)
      end
      @pos = cont.length if @pos > cont.length
      # Show indicator if multiline content detected
      display_cont = cont
      if @multiline_buffer && !@multiline_buffer.empty?
        lines_indicator = " [+#{@multiline_buffer.size} lines]"
        available = content_len - Rcurses.display_width(lines_indicator)
        if available > 0
          # Truncate cont to fit indicator
          trunc = cont
          while Rcurses.display_width(trunc) > available && trunc.length > 0
            trunc = trunc[0..-2]
          end
          display_cont = trunc + lines_indicator
        end
      end
      # Pad to full width using spaces (each space = 1 column)
      pad_needed = content_len - Rcurses.display_width(display_cont)
      padded = display_cont + (" " * [pad_needed, 0].max)
      print padded.c(fmt)
      # Calculate display width up to cursor position and ensure correct row
      display_pos = @pos > 0 ? Rcurses.display_width(cont[0...@pos]) : 0
      row(@y)
      col(@x + prompt_len + display_pos)
      chr = getchr(flush: false)
      case chr
      when 'LEFT'
        @pos -= 1 if @pos > 0
      when 'RIGHT'
        @pos += 1 if @pos < cont.length
      when 'HOME'
        @pos = 0
      when 'END'
        @pos = cont.length
      when 'DEL'
        cont[@pos] = '' if @pos < cont.length
      when 'BACK'
        if @pos > 0
          @pos -= 1
          cont[@pos] = ''
        end
      when 'WBACK'
        while @pos > 0 && cont[@pos - 1] != ' '
          @pos -= 1
          cont[@pos] = ''
        end
      when 'C-K'
        cont = ''
        @pos = 0
      when 'ENTER'
        # If there are lines in multiline_buffer, join all pasted lines
        if @multiline_buffer && !@multiline_buffer.empty?
          @multiline_buffer << cont.dup unless cont.empty?
          @text = @multiline_buffer.join("\n")
        else
          @text = cont
        end
        chr = 'ESC'
      when 'UP'
        if @history.any? && history_index > 0
          history_index -= 1
          cont = @history[history_index].pure.slice(0, content_len)
          @pos = cont.length
        end
      when 'DOWN'
        if history_index < @history.size - 1
          history_index += 1
          cont = @history[history_index].pure.slice(0, content_len)
          @pos = cont.length
        elsif history_index == @history.size - 1
          history_index += 1
          cont = ""
          @pos = 0
        end
      when 'C-E'
        if @emoji
          require_relative 'emoji' unless defined?(Rcurses::EmojiPicker)
          picked = Rcurses::EmojiPicker.pick(self)
          if picked
            cont.insert(@pos, picked)
            @pos += picked.length
          end
          # Redraw UI behind the overlay (full refresh to clear overlay artifacts)
          @emoji_refresh.call if @emoji_refresh
          # Redraw prompt line
          row(@y)
          col(@x)
          print @prompt.c(fmt)
        end
      when /^.$/
        if @pos < content_len
          cont.insert(@pos, chr)
          @pos += 1
        end
      end

      last_was_cr = false
      while IO.select([$stdin], nil, nil, 0)
        chr = $stdin.read_nonblock(1) rescue nil
        break unless chr
        # ESC byte starts an escape sequence (arrow key, etc.)
        # Push it back for getchr to parse properly on next iteration
        if chr == "\e"
          $stdin.ungetbyte(0x1b)
          break
        end
        # Normalize \r\n to a single newline: skip \n after \r
        if chr == "\n" && last_was_cr
          last_was_cr = false
          next
        end
        last_was_cr = (chr == "\r")
        # Handle newlines in multi-line paste (\n or \r)
        if chr == "\n" || chr == "\r"
          @multiline_buffer << cont.dup unless cont.empty?
          cont = ""
          @pos = 0
          next
        end
        if @pos < content_len
          cont.insert(@pos, chr)
          @pos += 1
        end
      end
    end
  ensure
    STDIN.raw!         rescue nil  
    STDIN.echo = false rescue nil
    while IO.select([$stdin], nil, nil, 0)
      $stdin.read_nonblock(4096) rescue break
    end
  end
  prompt_len = @prompt.pure.length
  # Calculate display width for final cursor position
  final_display_pos = @pos > 0 ? Rcurses.display_width(cont[0...(@pos - 1).clamp(0, cont.length)]) : 0
  new_col = @x + prompt_len + final_display_pos
  col(new_col)
  Rcurses::Cursor.hide
end

#full_refresh(cont = @text) ⇒ Object

full_refresh forces a complete repaint.



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# File 'lib/rcurses/pane.rb', line 158

def full_refresh(cont = @text)
  @prev_frame = nil
  refresh(cont)
end

#left ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 445

def left
  if @pos == 0
    if @line == 0
      unless @ix == 0
        @ix -= 1
        @pos = @txt[@ix + @line].length
      end
    else
      @line -= 1
      @pos = @txt[@ix + @line].length
    end
  else
    @pos -= 1
  end
end

#line_count ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 69

def line_count
  @line_count ||= @text.to_s.count("\n") + 1
end

#linedown ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 122

def linedown
  @ix += 1
  @ix = line_count - 1 if @ix > line_count - 1
  refresh
end

#lineup ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 128

def lineup
  @ix -= 1
  @ix = 0 if @ix < 0
  refresh
end

#move(dx, dy) ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 116

def move(dx, dy)
  @x += dx
  @y += dy
  refresh
end

#pagedown ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 134

def pagedown
  @ix = @ix + @h - 1
  max = line_count - @h
  @ix = max if @ix > max
  refresh
end

#pageup ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 141

def pageup
  @ix = @ix - @h + 1
  @ix = 0 if @ix < 0
  refresh
end

#parse(cont) ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 479

def parse(cont)
  cont.gsub!(/\*(.+?)\*/, '\1'.bd)
  cont.gsub!(/\/(.+?)\//, '\1'.it)
  cont.gsub!(/_(.+?)_/, '\1'.ul)
  cont.gsub!(/#(.+?)#/, '\1'.rv)
  cont.gsub!(/<([^|]+)\|([^>]+)>/) do
    text = $2; codes = $1
    text.c(codes)
  end
  cont
end

#refresh(cont = @text) ⇒ Object

Diff-based refresh that minimizes flicker. In this updated version we lazily process only the raw lines required to fill the pane.



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# File 'lib/rcurses/pane.rb', line 196

def refresh(cont = @text)
  return @prev_frame&.join("\n") || "" unless @update
  begin
    @max_h, @max_w = IO.console.winsize
  rescue => e
    # Fallback to reasonable defaults if terminal size can't be determined
    @max_h, @max_w = 24, 80
  end

  # Ensure minimum viable dimensions
  @max_h = [[@max_h, 3].max, 1000].min  # Between 3 and 1000 rows
  @max_w = [[@max_w, 10].max, 1000].min  # Between 10 and 1000 columns
  
  # Ensure pane dimensions are reasonable
  @w = [[@w, 1].max, @max_w].min
  @h = [[@h, 1].max, @max_h].min

  if @border
    @w = @max_w - 2 if @w > @max_w - 2
    @h = @max_h - 2 if @h > @max_h - 2
    @x = [[2, @x].max, @max_w - @w].min
    @y = [[2, @y].max, @max_h - @h].min
  else
    @w = @max_w if @w > @max_w
    @h = @max_h if @h > @max_h
    @x = [[1, @x].max, @max_w - @w + 1].min
    @y = [[1, @y].max, @max_h - @h + 1].min
  end

  # Save cursor with ANSI save (no stdin read needed)
  # Hide cursor, disable auto-wrap, reset all SGR and scroll margins
  STDOUT.print "\e7\e[?25l\e[?7l\e[0m\e[r"

  fmt = [@fg.to_s, @bg.to_s].join(',')
  
  # Skip color application if fg and bg are both nil or empty
  @skip_colors = (@fg.nil? && @bg.nil?) || (fmt == ",")
  

  # Lazy evaluation: If the content or pane width has changed, reinitialize the lazy cache.
  if !defined?(@cached_text) || @cached_text != cont || @cached_w != @w
    begin
      @raw_txt   = (cont || "").split(/\r?\n|\r/).map { |line| line }
      @lazy_txt  = []   # This will hold the processed (wrapped) lines as needed.
      @lazy_index = 0   # Pointer to the next raw line to process.
      @cached_text = (cont || "").dup
      @cached_w = @w
    rescue => e
      # Fallback if content processing fails
      @raw_txt = [""]
      @lazy_txt = []
      @lazy_index = 0
      @cached_text = ""
      @cached_w = @w
    end
  end

  content_rows = @h
  # Ensure we have processed enough lines for the current scroll position + visible area.
  # Dynamically process more lines as needed when scrolling through large lists
  required_lines = @ix + content_rows + 100  # Larger buffer for smoother scrolling
  
  # Safety limit to prevent excessive memory usage (but still very generous)
  max_allowed = 100000  # Allow up to 100k lines which should handle any reasonable directory
  
  # Process lines on demand as we scroll
  while @lazy_txt.size < required_lines && @lazy_index < @raw_txt.size
    # Safety check to prevent runaway memory usage
    break if @lazy_txt.size > max_allowed
    
    raw_line = @raw_txt[@lazy_index]
    # If the raw line is short, no wrapping is needed.
    if raw_line.respond_to?(:pure) && Rcurses.display_width(raw_line.pure) <= @w
      processed = [raw_line]
    else
      processed = split_line_with_ansi(raw_line, @w)
    end
    @lazy_txt.concat(processed)
    @lazy_index += 1
  end
  
  # Simplified: just limit max processing, don't trim existing cache
  # This avoids expensive array operations during scrolling
  
  @txt = @lazy_txt

  @ix = @txt.length - 1 if @ix > @txt.length - 1
  @ix = 0 if @ix < 0

  new_frame = []

  content_rows.times do |i|
    line_str = ""
    l = @ix + i
    if @txt[l].to_s != ""
      pl = @w - Rcurses.display_width(@txt[l].pure)
      pl = 0 if pl < 0
      hl = pl / 2
      
      # Check if text has ANSI background colors (48;5;N or 48;2;R;G;B)
      has_bg_color = @txt[l] =~ /\e\[[\d;]*48;[25];/
      
      if @skip_colors || (@txt[l].include?("\e[") && !@bg)
        # No pane colors to apply, or text has ANSI but pane has no bg
        case @align
        when "l"
          line_str = @txt[l] + " " * pl
        when "r"
          line_str = " " * pl + @txt[l]
        when "c"
          line_str = " " * hl + @txt[l] + " " * (pl - hl)
        end
      elsif @txt[l].include?("\e[") && @bg && !has_bg_color
        # Text has ANSI codes but no bg color - apply pane fg and bg to text and padding
        case @align
        when "l"
          line_str = @txt[l].c(fmt) + " ".c(fmt) * pl
        when "r"
          line_str = " ".c(fmt) * pl + @txt[l].c(fmt)
        when "c"
          line_str = " ".c(fmt) * hl + @txt[l].c(fmt) + " ".c(fmt) * (pl - hl)
        end
      elsif @txt[l].include?("\e[") && has_bg_color
        # Text has its own bg color - preserve it, only apply pane bg to padding
        case @align
        when "l"
          line_str = @txt[l] + " ".c(fmt) * pl
        when "r"
          line_str = " ".c(fmt) * pl + @txt[l]
        when "c"
          line_str = " ".c(fmt) * hl + @txt[l] + " ".c(fmt) * (pl - hl)
        end
      else
        # No ANSI codes - apply pane colors normally
        case @align
        when "l"
          line_str = @txt[l].c(fmt) + " ".c(fmt) * pl
        when "r"
          line_str = " ".c(fmt) * pl + @txt[l].c(fmt)
        when "c"
          line_str = " ".c(fmt) * hl + @txt[l].c(fmt) + " ".c(fmt) * (pl - hl)
        end
      end
    else
      # Empty line
      line_str = @skip_colors ? " " * @w : " ".c(fmt) * @w
    end

    # Strip non-SGR ANSI sequences (cursor movement, clear, etc.)
    # Keep only SGR sequences (ending in 'm') for colors/styles
    line_str = line_str.gsub(ANSI_CSI_RE, '')
    # Strip any raw control characters (except tab and ANSI ESC sequences)
    line_str = line_str.gsub(/[\x00-\x08\x0b-\x1a\x7f]/, '?')

    # Hard-clip line to pane width to prevent overflow into adjacent panes
    visible_w = Rcurses.display_width(line_str.respond_to?(:pure) ? line_str.pure : line_str.gsub(ANSI_RE, ''))
    if visible_w > @w
      line_str = line_str.respond_to?(:shorten) ? line_str.shorten(@w) : line_str[0, @w]
    end

    new_frame << line_str
  end

  diff_buf = ""
  new_frame.each_with_index do |line, i|
    row_num = @y + i
    col_num = @x
    if @prev_frame.nil? || @prev_frame[i] != line
      diff_buf << "\e[#{row_num};#{col_num}H" << line
    end
  end

  # Restore cursor, reset SGR and scroll-region (keep auto-wrap disabled)
  diff_buf << "\e8\e[0m\e[r"
  begin
    print diff_buf
  rescue StandardError
    begin
      print "\e[0m\e[?25h"
    rescue StandardError
    end
  end
  @prev_frame = new_frame

  # Draw scroll markers after printing the frame.
  if @scroll
    marker_col = @x + @w - 1
    sfmt = @scroll_fg ? [(@scroll_fg).to_s, @bg.to_s].join(',') : fmt
    if @ix > 0
      print "\e[#{@y};#{marker_col}H" + "∆".c(sfmt)
    end
    # If there are more processed lines than fit in the pane
    # OR there remain raw lines to process, show the down marker.
    if (@txt.length - @ix) > @h || (@lazy_index < @raw_txt.size)
      print "\e[#{@y + @h - 1};#{marker_col}H" + "∇".c(sfmt)
    end
  end

  if @border
    tl, tr, bl, br, h, v = border_chars

    # top
    print "\e[#{@y - 1};#{@x - 1}H" + (tl + h * @w + tr).c(fmt)
    # sides
    (0...@h).each do |i|
      print "\e[#{@y + i};#{@x - 1}H"  + v.c(fmt)
      print "\e[#{@y + i};#{@x + @w}H" + v.c(fmt)
    end
    # bottom
    print "\e[#{@y + @h};#{@x - 1}H" + (bl + h * @w + br).c(fmt)
  end

  new_frame.join("\n")
end

#right ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 423

def right
  if @pos < @txt[@ix + @line].length
    @pos += 1
    if @pos == @w
      @pos = 0
      if @line == @h - 1
        @ix += 1
      else
        @line += 1
      end
    end
  else
    if @line == @h - 1
      @ix += 1 unless @ix >= @txt.length - @h
      @pos = 0
    elsif @line + @ix + 1 < @txt.length
      @line += 1
      @pos = 0
    end
  end
end

#say(text) ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 84

def say(text)
  if @record && !text.empty?
    @history << text
    @history.shift while @history.size > @max_history_size
  end
  @text = text
  @ix   = 0
  refresh 
end

#textformat(cont) ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 411

def textformat(cont)
  # This method is no longer used in refresh since we process lazily,
  # but is kept here if needed elsewhere.
  lines = cont.split("\n")
  result = []
  lines.each do |line|
    split_lines = split_line_with_ansi(line, @w)
    result.concat(split_lines)
  end
  result
end

#top ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 152

def top
  @ix = 0
  refresh
end

#up ⇒ Object 



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# File 'lib/rcurses/pane.rb', line 461

def up
  if @line == 0
    @ix -= 1 unless @ix == 0
  else
    @line -= 1
  end
  @pos = [@pos, @txt[@ix + @line]&.length || 0].min
end