Class: Echoes::Screen

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

Constant Summary collapse

DEC_SPECIAL = 
{
  '`' => "\u{25C6}", 'a' => "\u{2592}", 'b' => "\u{2409}", 'c' => "\u{240C}",
  'd' => "\u{240D}", 'e' => "\u{240A}", 'f' => "\u{00B0}", 'g' => "\u{00B1}",
  'h' => "\u{2424}", 'i' => "\u{240B}", 'j' => "\u{2518}", 'k' => "\u{2510}",
  'l' => "\u{250C}", 'm' => "\u{2514}", 'n' => "\u{253C}", 'o' => "\u{23BA}",
  'p' => "\u{23BB}", 'q' => "\u{2500}", 'r' => "\u{23BC}", 's' => "\u{23BD}",
  't' => "\u{251C}", 'u' => "\u{2524}", 'v' => "\u{2534}", 'w' => "\u{252C}",
  'x' => "\u{2502}", 'y' => "\u{2264}", 'z' => "\u{2265}", '{' => "\u{03C0}",
  '|' => "\u{2260}", '}' => "\u{00A3}", '~' => "\u{00B7}",
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rows: 24, cols: 80) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/echoes/screen.rb', line 16

def initialize(rows: 24, cols: 80)
  @rows = rows
  @cols = cols
  @cursor = Cursor.new
  @attrs = Cell.new
  @grid = Array.new(rows) { Array.new(cols) { Cell.new } }
  @line_wrapped = Array.new(rows, false)
  @scroll_top = 0
  @scroll_bottom = rows - 1
  @saved_cursor = nil
  @scrollback = []
  @scrollback_wrapped = []
  @cell_pixel_width = 8.0
  @cell_pixel_height = 16.0
  @application_cursor_keys = false
  @bracketed_paste_mode = false
  @focus_reporting = false
  @auto_wrap = true
  @mouse_tracking = :off   # :off, :x10, :normal, :button_event, :any_event
  @mouse_encoding = :default  # :default, :sgr
  @origin_mode = false
  @insert_mode = false
  @application_keypad = false
  @cursor_style = 0  # 0=default, 1=blinking block, 2=steady block, 3=blinking underline, 4=steady underline, 5=blinking bar, 6=steady bar
  @using_alt_screen = false
  @charset_g0 = :ascii  # :ascii or :dec_special
  @charset_g1 = :ascii
  @charset_g2 = :ascii
  @charset_g3 = :ascii
  @active_charset = 0   # 0 = G0, 1 = G1
  @single_shift = nil   # nil, 2, or 3 (for SS2/SS3)
  @tab_stops = default_tab_stops
  @main_grid = nil
  @main_cursor = nil
  @main_scroll_top = nil
  @main_scroll_bottom = nil
  @main_saved_cursor = nil
  @main_scrollback = nil
  @pending_wrap = false
  @last_char = nil
  @title_stack = []
  @dirty_rows = Set.new((0...rows).to_a)
  @bg_fills = []  # OSC 7772 ;bg-fill regions; each: {rect:[r1,c1,r2,c2], color:[r,g,b,a]}
  # OSC 133 prompt-boundary markers: each entry is a Hash with
  # :prompt_start / :input_start / :output_start / :output_end /
  # :exit_code keys, where the row values are *visual* row indices —
  # `scrollback_size + grid_row` at the moment the marker was seen.
  # When scrollback shifts off the front, mark rows decrement so
  # they keep pointing at the same content; marks that fall before
  # the scrollback floor are dropped.
  @command_marks = []
  @current_command_mark = nil
end

Instance Attribute Details

#active_charset ⇒ Object

Returns the value of attribute active_charset.



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# File 'lib/echoes/screen.rb', line 682

def active_charset
  @active_charset
end

#application_keypad ⇒ Object

Returns the value of attribute application_keypad.



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# File 'lib/echoes/screen.rb', line 682

def application_keypad
  @application_keypad
end

#background ⇒ Object

Returns the value of attribute background.



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# File 'lib/echoes/screen.rb', line 9

def background
  @background
end

#bell ⇒ Object

Returns the value of attribute bell.



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# File 'lib/echoes/screen.rb', line 682

def bell
  @bell
end

#bg_fills ⇒ Object

Returns the value of attribute bg_fills.



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# File 'lib/echoes/screen.rb', line 9

def bg_fills
  @bg_fills
end

#cell_pixel_height ⇒ Object

Returns the value of attribute cell_pixel_height.



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# File 'lib/echoes/screen.rb', line 9

def cell_pixel_height
  @cell_pixel_height
end

#cell_pixel_width ⇒ Object

Returns the value of attribute cell_pixel_width.



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# File 'lib/echoes/screen.rb', line 9

def cell_pixel_width
  @cell_pixel_width
end

#clipboard_handler ⇒ Object

Returns the value of attribute clipboard_handler.



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# File 'lib/echoes/screen.rb', line 871

def clipboard_handler
  @clipboard_handler
end

#cols ⇒ Object (readonly)

Returns the value of attribute cols.



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# File 'lib/echoes/screen.rb', line 7

def cols
  @cols
end

#command_marks ⇒ Object (readonly)

Returns the value of attribute command_marks.



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# File 'lib/echoes/screen.rb', line 7

def command_marks
  @command_marks
end

#current_directory ⇒ Object

Returns the value of attribute current_directory.



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# File 'lib/echoes/screen.rb', line 9

def current_directory
  @current_directory
end

#cursor ⇒ Object (readonly)

Returns the value of attribute cursor.



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# File 'lib/echoes/screen.rb', line 7

def cursor
  @cursor
end

#cursor_style ⇒ Object

Returns the value of attribute cursor_style.



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# File 'lib/echoes/screen.rb', line 682

def cursor_style
  @cursor_style
end

#dirty_rows ⇒ Object (readonly)

Returns the value of attribute dirty_rows.



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# File 'lib/echoes/screen.rb', line 7

def dirty_rows
  @dirty_rows
end

#glyph_measurer ⇒ Object

Returns the value of attribute glyph_measurer.



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# File 'lib/echoes/screen.rb', line 871

def glyph_measurer
  @glyph_measurer
end

#grid ⇒ Object (readonly)

Returns the value of attribute grid.



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# File 'lib/echoes/screen.rb', line 7

def grid
  @grid
end

#insert_mode ⇒ Object

Returns the value of attribute insert_mode.



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# File 'lib/echoes/screen.rb', line 682

def insert_mode
  @insert_mode
end

#mouse_encoding ⇒ Object

Returns the value of attribute mouse_encoding.



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# File 'lib/echoes/screen.rb', line 682

def mouse_encoding
  @mouse_encoding
end

#mouse_tracking ⇒ Object

Returns the value of attribute mouse_tracking.



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# File 'lib/echoes/screen.rb', line 682

def mouse_tracking
  @mouse_tracking
end

#palette_handler ⇒ Object

Returns the value of attribute palette_handler.



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# File 'lib/echoes/screen.rb', line 871

def palette_handler
  @palette_handler
end

#pending_wrap ⇒ Object

Returns the value of attribute pending_wrap.



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# File 'lib/echoes/screen.rb', line 9

def pending_wrap
  @pending_wrap
end

#rows ⇒ Object (readonly)

Returns the value of attribute rows.



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# File 'lib/echoes/screen.rb', line 7

def rows
  @rows
end

#scrollback ⇒ Object (readonly)

Returns the value of attribute scrollback.



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# File 'lib/echoes/screen.rb', line 7

def scrollback
  @scrollback
end

#single_shift ⇒ Object

Returns the value of attribute single_shift.



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# File 'lib/echoes/screen.rb', line 682

def single_shift
  @single_shift
end

#title ⇒ Object

Returns the value of attribute title.



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# File 'lib/echoes/screen.rb', line 9

def title
  @title
end

Class Method Details

.scrollback_limit ⇒ Object 



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# File 'lib/echoes/screen.rb', line 12

def self.scrollback_limit
  Echoes.config.scrollback_limit
end

Instance Method Details

#adjust_command_marks(delta) ⇒ Object

When scrollback shifts (oldest row dropped), every row index in now point before the scrollback floor are dropped — their content is no longer reachable.



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# File 'lib/echoes/screen.rb', line 856

def adjust_command_marks(delta)
  return if @command_marks.empty?
  @command_marks.each do |m|
    m.each_key do |k|
      next if k == :exit_code
      v = m[k]
      m[k] = v + delta if v
    end
  end
  @command_marks.reject! { |m| m[:prompt_start] && m[:prompt_start] < 0 }
  if @current_command_mark && (@current_command_mark[:prompt_start] || 0) < 0
    @current_command_mark = nil
  end
end

#application_cursor_keys=(val) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 653

def application_cursor_keys=(val)
  @application_cursor_keys = val
end

#application_cursor_keys? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 649

def application_cursor_keys?
  @application_cursor_keys
end

#apply_sgr_subparams(sub) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 580

def apply_sgr_subparams(sub)
  case sub[0]
  when 4
    # Underline style: 4:0=off, 4:1=single, 4:2=double, 4:3=curly, 4:4=dotted, 4:5=dashed
    style = sub[1] || 1
    if style == 0
      @attrs.underline = false
    else
      @attrs.underline = style
    end
  when 38
    # Foreground color with sub-parameters
    if sub[1] == 2
      # 38:2:cs:R:G:B or 38:2:R:G:B (cs = color space, often empty/omitted)
      r, g, b = extract_rgb_subparams(sub, 2)
      @attrs.fg = [r, g, b] if r && g && b
    elsif sub[1] == 5 && sub[2]
      @attrs.fg = sub[2]
    end
  when 48
    # Background color with sub-parameters
    if sub[1] == 2
      r, g, b = extract_rgb_subparams(sub, 2)
      @attrs.bg = [r, g, b] if r && g && b
    elsif sub[1] == 5 && sub[2]
      @attrs.bg = sub[2]
    end
  when 58
    # Underline color
    if sub[1] == 2
      r, g, b = extract_rgb_subparams(sub, 2)
      @attrs.underline_color = [r, g, b] if r && g && b
    elsif sub[1] == 5 && sub[2]
      @attrs.underline_color = sub[2]
    end
  when 59
    @attrs.underline_color = nil
  end
end

#auto_wrap=(val) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 677

def auto_wrap=(val)
  @auto_wrap = val
  @pending_wrap = false
end

#auto_wrap? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 673

def auto_wrap?
  @auto_wrap
end

#backspace ⇒ Object 



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# File 'lib/echoes/screen.rb', line 368

def backspace
  @pending_wrap = false
  @cursor.col = [0, @cursor.col - 1].max
end

#backward_tab(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 346

def backward_tab(n = 1)
  @pending_wrap = false
  n.times do
    prev_stop = @tab_stops.reverse.find { |s| s < @cursor.col }
    @cursor.col = prev_stop || 0
  end
end

#bracketed_paste_mode=(val) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 661

def bracketed_paste_mode=(val)
  @bracketed_paste_mode = val
end

#bracketed_paste_mode? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 657

def bracketed_paste_mode?
  @bracketed_paste_mode
end

#carriage_return ⇒ Object 



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# File 'lib/echoes/screen.rb', line 317

def carriage_return
  @pending_wrap = false
  @cursor.col = 0
end

#clear_dirty ⇒ Object 



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# File 'lib/echoes/screen.rb', line 700

def clear_dirty
  @dirty_rows = Set.new
end

#clear_tab_stop(mode = 0) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 359

def clear_tab_stop(mode = 0)
  case mode
  when 0
    @tab_stops.delete(@cursor.col)
  when 3
    @tab_stops.clear
  end
end

#clipboard_content ⇒ Object 



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# File 'lib/echoes/screen.rb', line 877

def clipboard_content
  @clipboard_handler&.call(:get, nil)
end

#decaln ⇒ Object 



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# File 'lib/echoes/screen.rb', line 1035

def decaln
  @grid.each do |row|
    row.each do |cell|
      cell.reset!
      cell.char = 'E'
    end
  end
  @cursor.row = 0
  @cursor.col = 0
  @pending_wrap = false
  mark_all_dirty
end

#delete_chars(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 431

def delete_chars(n = 1)
  @pending_wrap = false
  row = @grid[@cursor.row]
  n.times do
    row.delete_at(@cursor.col)
    row.push(Cell.new)
  end
  mark_dirty(@cursor.row)
end

#delete_lines(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 418

def delete_lines(n = 1)
  @pending_wrap = false
  return unless @cursor.row >= @scroll_top && @cursor.row <= @scroll_bottom

  n.times do
    @grid.delete_at(@cursor.row)
    @line_wrapped.delete_at(@cursor.row)
    @grid.insert(@scroll_bottom, Array.new(@cols) { Cell.new })
    @line_wrapped.insert(@scroll_bottom, false)
  end
  (@cursor.row..@scroll_bottom).each { |r| mark_dirty(r) }
end

#designate_charset(g, charset) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 881

def designate_charset(g, charset)
  case g
  when 0 then @charset_g0 = charset
  when 1 then @charset_g1 = charset
  when 2 then @charset_g2 = charset
  when 3 then @charset_g3 = charset
  end
end

#erase_chars(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 451

def erase_chars(n = 1)
  n.times do |i|
    col = @cursor.col + i
    break if col >= @cols
    @grid[@cursor.row][col].reset!
  end
  mark_dirty(@cursor.row)
end

#erase_in_display(mode = 0) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 373

def erase_in_display(mode = 0)
  @pending_wrap = false
  case mode
  when 0
    @line_wrapped[@cursor.row] = false
    erase_in_line(0)
    ((@cursor.row + 1)...@rows).each { |r| clear_row(r); @line_wrapped[r] = false; mark_dirty(r) }
  when 1
    erase_in_line(1)
    (0...@cursor.row).each { |r| clear_row(r); @line_wrapped[r] = false; mark_dirty(r) }
  when 2
    (0...@rows).each { |r| clear_row(r); @line_wrapped[r] = false }
    mark_all_dirty
  when 3
    @scrollback.clear
    @scrollback_wrapped.clear
  end
end

#erase_in_line(mode = 0) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 392

def erase_in_line(mode = 0)
  @pending_wrap = false
  mark_dirty(@cursor.row)
  case mode
  when 0
    (@cursor.col...@cols).each { |c| @grid[@cursor.row][c].reset! }
  when 1
    (0..@cursor.col).each { |c| @grid[@cursor.row][c].reset! }
  when 2
    clear_row(@cursor.row)
  end
end

#find_command_mark_at_row(abs_row) ⇒ Object

Find the command mark whose prompt+input region covers ‘abs_row`, or nil if no mark covers that row. The region runs from :prompt_start (inclusive) up to :output_start (exclusive). If a command is still running and no :output_start has been recorded yet, the region is taken as just :prompt_start itself (one row).



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# File 'lib/echoes/screen.rb', line 831

def find_command_mark_at_row(abs_row)
  @command_marks.reverse_each.find do |m|
    next false unless m[:prompt_start]
    upper = m[:output_start] || (m[:prompt_start] + 1)
    abs_row >= m[:prompt_start] && abs_row < upper
  end
end

#focus_reporting=(val) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 669

def focus_reporting=(val)
  @focus_reporting = val
end

#focus_reporting? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 665

def focus_reporting?
  @focus_reporting
end

#hide_cursor ⇒ Object 



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# File 'lib/echoes/screen.rb', line 979

def hide_cursor
  @cursor.visible = false
end

#insert_chars(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 441

def insert_chars(n = 1)
  @pending_wrap = false
  row = @grid[@cursor.row]
  n.times do
    row.pop
    row.insert(@cursor.col, Cell.new)
  end
  mark_dirty(@cursor.row)
end

#insert_lines(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 405

def insert_lines(n = 1)
  @pending_wrap = false
  return unless @cursor.row >= @scroll_top && @cursor.row <= @scroll_bottom

  n.times do
    @grid.insert(@cursor.row, Array.new(@cols) { Cell.new })
    @line_wrapped.insert(@cursor.row, false)
    @grid.delete_at(@scroll_bottom + 1)
    @line_wrapped.delete_at(@scroll_bottom + 1)
  end
  (@cursor.row..@scroll_bottom).each { |r| mark_dirty(r) }
end

#last_completed_command_mark ⇒ Object

Most recently completed command mark (D was emitted). nil if no command has finished yet on this pane.



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# File 'lib/echoes/screen.rb', line 813

def last_completed_command_mark
  @command_marks.reverse_each.find { |m| m[:output_end] }
end

#line_feed ⇒ Object 



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# File 'lib/echoes/screen.rb', line 322

def line_feed
  @pending_wrap = false
  if @cursor.row == @scroll_bottom
    scroll_up(1)
  else
    @cursor.row = [@cursor.row + 1, @rows - 1].min
  end
end

#mark_all_dirty ⇒ Object 



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# File 'lib/echoes/screen.rb', line 696

def mark_all_dirty
  @dirty_rows = Set.new((0...@rows).to_a)
end

#mark_dirty(row) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 692

def mark_dirty(row)
  @dirty_rows << row
end

#move_cursor(row, col) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 271

def move_cursor(row, col)
  @pending_wrap = false
  if @origin_mode
    @cursor.row = (row + @scroll_top).clamp(@scroll_top, @scroll_bottom)
  else
    @cursor.row = clamp_row(row)
  end
  @cursor.col = clamp_col(col)
end

#move_cursor_backward(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 312

def move_cursor_backward(n = 1)
  @pending_wrap = false
  @cursor.col = [0, @cursor.col - n].max
end

#move_cursor_down(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 287

def move_cursor_down(n = 1)
  @pending_wrap = false
  bottom = @cursor.row <= @scroll_bottom ? @scroll_bottom : @rows - 1
  @cursor.row = [bottom, @cursor.row + n].min
end

#move_cursor_forward(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 307

def move_cursor_forward(n = 1)
  @pending_wrap = false
  @cursor.col = [@cols - 1, @cursor.col + n].min
end

#move_cursor_next_line(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 293

def move_cursor_next_line(n = 1)
  @pending_wrap = false
  bottom = @cursor.row <= @scroll_bottom ? @scroll_bottom : @rows - 1
  @cursor.row = [bottom, @cursor.row + n].min
  @cursor.col = 0
end

#move_cursor_prev_line(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 300

def move_cursor_prev_line(n = 1)
  @pending_wrap = false
  top = @cursor.row >= @scroll_top ? @scroll_top : 0
  @cursor.row = [top, @cursor.row - n].max
  @cursor.col = 0
end

#move_cursor_up(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 281

def move_cursor_up(n = 1)
  @pending_wrap = false
  top = @cursor.row >= @scroll_top ? @scroll_top : 0
  @cursor.row = [top, @cursor.row - n].max
end

#origin_mode=(val) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 894

def origin_mode=(val)
  @origin_mode = val
  @pending_wrap = false
  if val
    @cursor.row = @scroll_top
    @cursor.col = 0
  end
end

#origin_mode? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 890

def origin_mode?
  @origin_mode
end

#osc133_mark(kind, exit_code: nil) ⇒ Object

OSC 133 prompt boundary marker. ‘kind` is one of:

:prompt_start  — OSC 133 ; A — beginning of a fresh prompt block
:prompt_end    — OSC 133 ; B — end of prompt / start of input
:command_start — OSC 133 ; C — start of command output
:command_end   — OSC 133 ; D — end of command output (with optional exit code)

Marks are stored as visual rows (scrollback rows + grid rows from 0). ‘:prompt_start` opens a new mark; subsequent kinds populate it.



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# File 'lib/echoes/screen.rb', line 765

def osc133_mark(kind, exit_code: nil)
  row = @scrollback.size + @cursor.row
  case kind
  when :prompt_start
    @current_command_mark = {
      prompt_start: row, input_start: nil,
      output_start: nil, output_end: nil, exit_code: nil,
    }
    @command_marks << @current_command_mark
  when :prompt_end
    @current_command_mark ||= {prompt_start: row, input_start: nil,
                               output_start: nil, output_end: nil, exit_code: nil}
    @command_marks << @current_command_mark unless @command_marks.last.equal?(@current_command_mark)
    @current_command_mark[:input_start] = row
  when :command_start
    return unless @current_command_mark
    @current_command_mark[:output_start] = row
  when :command_end
    return unless @current_command_mark
    @current_command_mark[:output_end] = row
    @current_command_mark[:exit_code] = exit_code
  end
end

#output_region_for_row(abs_row) ⇒ Object

Find the command mark whose output region covers ‘abs_row` and return [start_row, end_row] (both inclusive) so callers like the GUI’s triple-click can highlight or copy that whole region. nil if no completed mark covers the row.



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# File 'lib/echoes/screen.rb', line 843

def output_region_for_row(abs_row)
  mark = @command_marks.reverse_each.find do |m|
    next false unless m[:output_start] && m[:output_end]
    abs_row >= m[:output_start] && abs_row < m[:output_end]
  end
  return nil unless mark
  [mark[:output_start], mark[:output_end] - 1]
end

#pop_title ⇒ Object 



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# File 'lib/echoes/screen.rb', line 688

def pop_title
  @title = @title_stack.pop if @title_stack.any?
end

#push_title ⇒ Object 



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# File 'lib/echoes/screen.rb', line 684

def push_title
  @title_stack.push(@title)
end

#put_char(c) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 81

def put_char(c)
  if c.bytesize == 1
    if @single_shift
      cs = @single_shift == 2 ? @charset_g2 : @charset_g3
      @single_shift = nil
    else
      cs = @active_charset == 0 ? @charset_g0 : @charset_g1
    end
    if cs == :dec_special
      c = DEC_SPECIAL.fetch(c, c)
    end
  end

  # Combining characters: append to previous cell
  if combining?(c)
    col = @pending_wrap ? @cursor.col : [0, @cursor.col - 1].max
    col -= 1 if col > 0 && @grid[@cursor.row][col].width == 0
    @grid[@cursor.row][col].char += c
    @last_char = @grid[@cursor.row][col].char
    return
  end

  w = char_width(c)

  if @auto_wrap
    # Deferred wrap: if the previous character set the flag, wrap now
    if @pending_wrap
      @pending_wrap = false
      @line_wrapped[@cursor.row] = true
      @cursor.col = 0
      line_feed
    end

    # Wide char at last column: doesn't fit, wrap first
    if w == 2 && @cursor.col == @cols - 1
      @grid[@cursor.row][@cursor.col].reset!
      @line_wrapped[@cursor.row] = true
      @cursor.col = 0
      line_feed
    end
  else
    # No wrap: clamp cursor to last column
    if w == 2 && @cursor.col >= @cols - 1
      @cursor.col = @cols - 2
    elsif @cursor.col >= @cols
      @cursor.col = @cols - 1
    end
  end

  erase_multicell_at(@cursor.row, @cursor.col)

  if @insert_mode
    row = @grid[@cursor.row]
    w.times { row.pop; row.insert(@cursor.col, Cell.new) }
  end

  cell = @grid[@cursor.row][@cursor.col]
  cell.copy_from(@attrs)
  cell.char = c
  cell.width = w

  if w == 2 && @cursor.col + 1 < @cols
    # Mark the next cell as a continuation (width 0)
    next_cell = @grid[@cursor.row][@cursor.col + 1]
    next_cell.reset!
    next_cell.width = 0
  end

  mark_dirty(@cursor.row)

  @cursor.col += w
  if @cursor.col >= @cols
    @cursor.col = @cols - 1
    @pending_wrap = true if @auto_wrap
  end

  @last_char = c
end

#put_multicell(text, scale:, width:, frac_n:, frac_d:, valign:, halign:, family: nil) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 166

def put_multicell(text, scale:, width:, frac_n:, frac_d:, valign:, halign:, family: nil)
  mc_rows = scale

  if width > 0
    # Explicit width: entire text in one block of scale*width cols × scale rows
    place_multicell_block(text, scale * width, mc_rows, scale, frac_n, frac_d, valign, halign, family)
  elsif halign != 0
    # h= is set: render the whole string as one block of
    # `scale × source_chars` cells, so the renderer's halign math
    # has room to center / right-align the glyphs. The spec only
    # mandates h= when the glyphs are smaller than the block
    # (fractional n<d), but extending it to non-fractional /
    # proportional text is a natural superset — other terminals
    # just ignore the attribute. With a proportional family we
    # widen the block to `max(scale × source_chars, measured)` so
    # the text never overflows but still gets visible side
    # margins for centering.
    source_chars = text.each_grapheme_cluster.sum { |g| char_width(g) }
    mc_cols = scale * source_chars
    if family && @glyph_measurer && @cell_pixel_width && @cell_pixel_width > 0
      measured_px = @glyph_measurer.call(text, family, scale, frac_n, frac_d).to_f
      measured_cells = (measured_px / @cell_pixel_width).ceil
      mc_cols = [mc_cols, measured_cells].max
    end
    mc_cols = [mc_cols, 1].max
    place_multicell_block(text, mc_cols, mc_rows, scale, frac_n, frac_d, valign, halign, family)
  elsif family && @glyph_measurer && @cell_pixel_width && @cell_pixel_width > 0
    # Proportional fonts have variable glyph widths, so reserving
    # `char_width(grapheme) * scale` cells per grapheme leaves big
    # letters (Noto Serif "H" at 2×) overflowing into the next
    # cell and small letters ("l") under-filling theirs. Ask the
    # host to measure the whole text in the requested font and
    # reserve enough cells for the entire block, drawn as one
    # unit by the renderer's existing string-draw path.
    measured_px = @glyph_measurer.call(text, family, scale, frac_n, frac_d).to_f
    mc_cols = (measured_px / @cell_pixel_width).ceil
    mc_cols = [mc_cols, 1].max
    place_multicell_block(text, mc_cols, mc_rows, scale, frac_n, frac_d, valign, halign, family)
  else
    # Auto width: each grapheme gets its own block (monospace
    # assumption — fine for the configured terminal font).
    text.each_grapheme_cluster do |grapheme|
      cw = char_width(grapheme)
      mc_cols = scale * cw
      place_multicell_block(grapheme, mc_cols, mc_rows, scale, frac_n, frac_d, valign, halign, family)
    end
  end
end

#put_sixel(data, params) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 215

def put_sixel(data, params)
  decoder = SixelDecoder.new(params).decode(data)
  return if decoder.width == 0 || decoder.height == 0

  mc_cols = (decoder.width / @cell_pixel_width).ceil
  mc_rows = (decoder.height / @cell_pixel_height).ceil

  return if mc_cols > @cols || mc_rows > @rows

  # Wrap if it doesn't fit on current line
  if @cursor.col + mc_cols > @cols
    @cursor.col = 0
    line_feed
  end

  # Scroll if block doesn't fit vertically
  while @cursor.row + mc_rows > @rows
    scroll_up(1)
    @cursor.row = [@cursor.row - 1, 0].max
  end

  anchor_row = @cursor.row
  anchor_col = @cursor.col

  # Erase existing cells in the block area
  mc_rows.times do |dr|
    mc_cols.times do |dc|
      erase_multicell_at(anchor_row + dr, anchor_col + dc)
    end
  end

  # Set anchor cell with sixel data
  anchor = @grid[anchor_row][anchor_col]
  anchor.reset!
  anchor.char = " "
  anchor.width = 1
  anchor.multicell = {
    cols: mc_cols, rows: mc_rows, scale: 1,
    frac_n: 0, frac_d: 0, valign: 0, halign: 0,
    sixel: { width: decoder.width, height: decoder.height, rgba: decoder.to_rgba }
  }

  # Mark continuation cells
  mc_rows.times do |dr|
    mc_cols.times do |dc|
      next if dr == 0 && dc == 0
      cont = @grid[anchor_row + dr][anchor_col + dc]
      cont.reset!
      cont.multicell = :cont
    end
  end

  @cursor.col = 0
  @cursor.row = [anchor_row + mc_rows, @rows - 1].min
end

#put_styled_segments(segments) ⇒ Object

Write a sequence of styled prompt segments directly into the cell grid, bypassing the ANSI SGR parser. Each segment is a ‘fg:, bg:, bold:, italic:, underline:, inverse:` Hash (see `Rubish::REPL#prompt_segments`). Color values follow rubish’s encoding: nil = default, 0..255 = palette index, ‘[:rgb, r, g, b]` = true color (translated to `[r, g, b]` for this Screen’s storage convention).

Existing ‘@attrs` is snapshotted and restored so any in-flight SGR state from prior parser-driven rendering is preserved.



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# File 'lib/echoes/screen.rb', line 718

def put_styled_segments(segments)
  saved_fg        = @attrs.fg
  saved_bg        = @attrs.bg
  saved_bold      = @attrs.bold
  saved_italic    = @attrs.italic
  saved_underline = @attrs.underline
  saved_inverse   = @attrs.inverse
  begin
    segments.each do |seg|
      @attrs.fg        = translate_segment_color(seg[:fg])
      @attrs.bg        = translate_segment_color(seg[:bg])
      @attrs.bold      = !!seg[:bold]
      @attrs.italic    = !!seg[:italic]
      @attrs.underline = !!seg[:underline]
      @attrs.inverse   = !!seg[:inverse]
      (seg[:text] || '').each_char { |c| put_char(c) }
    end
  ensure
    @attrs.fg        = saved_fg
    @attrs.bg        = saved_bg
    @attrs.bold      = saved_bold
    @attrs.italic    = saved_italic
    @attrs.underline = saved_underline
    @attrs.inverse   = saved_inverse
  end
end

#repeat_char(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 160

def repeat_char(n = 1)
  return unless @last_char

  n.times { put_char(@last_char) }
end

#reset ⇒ Object 



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# File 'lib/echoes/screen.rb', line 1048

def reset
  @cursor = Cursor.new
  @attrs = Cell.new
  @grid = Array.new(@rows) { Array.new(@cols) { Cell.new } }
  @line_wrapped = Array.new(@rows, false)
  @scroll_top = 0
  @scroll_bottom = @rows - 1
  @saved_cursor = nil
  @scrollback = []
  @scrollback_wrapped = []
  @tab_stops = default_tab_stops
  @pending_wrap = false
  mark_all_dirty
end

#resize(new_rows, new_cols) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 1063

def resize(new_rows, new_cols)
  old_cols = @cols
  @rows = new_rows
  @cols = new_cols

  if new_cols != old_cols
    reflow(new_rows, new_cols, old_cols)
  else
    # Only row count changed — simple add/remove
    if new_rows > @grid.size
      (new_rows - @grid.size).times do
        @grid.push(Array.new(new_cols) { Cell.new })
        @line_wrapped.push(false)
      end
    elsif new_rows < @grid.size
      @grid.slice!(new_rows..)
      @line_wrapped.slice!(new_rows..)
    end
  end

  @scroll_top = 0
  @scroll_bottom = new_rows - 1
  @cursor.row = clamp_row(@cursor.row)
  @cursor.col = clamp_col(@cursor.col)
  @pending_wrap = false
end

#restore_cursor ⇒ Object 



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# File 'lib/echoes/screen.rb', line 635

def restore_cursor
  if @saved_cursor
    @cursor.row = @saved_cursor[:row]
    @cursor.col = @saved_cursor[:col]
    @attrs.copy_from(@saved_cursor[:attrs])
    @origin_mode = @saved_cursor[:origin_mode]
    @auto_wrap = @saved_cursor[:auto_wrap]
    @charset_g0 = @saved_cursor[:charset_g0]
    @charset_g1 = @saved_cursor[:charset_g1]
    @active_charset = @saved_cursor[:active_charset]
    @pending_wrap = @saved_cursor[:pending_wrap] || false
  end
end

#reverse_index ⇒ Object 



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# File 'lib/echoes/screen.rb', line 331

def reverse_index
  @pending_wrap = false
  if @cursor.row == @scroll_top
    scroll_down(1)
  else
    @cursor.row = [0, @cursor.row - 1].max
  end
end

#save_cursor ⇒ Object 



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# File 'lib/echoes/screen.rb', line 620

def save_cursor
  saved_attrs = Cell.new
  saved_attrs.copy_from(@attrs)
  @saved_cursor = {
    row: @cursor.row, col: @cursor.col,
    attrs: saved_attrs,
    origin_mode: @origin_mode,
    auto_wrap: @auto_wrap,
    charset_g0: @charset_g0,
    charset_g1: @charset_g1,
    active_charset: @active_charset,
    pending_wrap: @pending_wrap,
  }
end

#scroll_down(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 481

def scroll_down(n = 1)
  @pending_wrap = false
  n.times do
    @grid.delete_at(@scroll_bottom)
    @line_wrapped.delete_at(@scroll_bottom)
    @grid.insert(@scroll_top, Array.new(@cols) { Cell.new })
    @line_wrapped.insert(@scroll_top, false)
  end
  (@scroll_top..@scroll_bottom).each { |r| mark_dirty(r) }
end

#scroll_up(n = 1) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 460

def scroll_up(n = 1)
  @pending_wrap = false
  n.times do
    if @scroll_top == 0
      row = @grid[@scroll_top]
      @scrollback << row.map { |cell| c = Cell.new; c.copy_from(cell); c.width = cell.width; c.multicell = cell.multicell; c }
      @scrollback_wrapped << @line_wrapped[@scroll_top]
      if @scrollback.size > self.class.scrollback_limit
        @scrollback.shift
        adjust_command_marks(-1)
      end
      @scrollback_wrapped.shift if @scrollback_wrapped.size > self.class.scrollback_limit
    end
    @grid.delete_at(@scroll_top)
    @line_wrapped.delete_at(@scroll_top)
    @grid.insert(@scroll_bottom, Array.new(@cols) { Cell.new })
    @line_wrapped.insert(@scroll_bottom, false)
  end
  (@scroll_top..@scroll_bottom).each { |r| mark_dirty(r) }
end

#selected_text(sr, sc, er, ec) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 987

def selected_text(sr, sc, er, ec)
  lines = []
  (sr..er).each do |r|
    from = (r == sr) ? sc : 0
    to = (r == er) ? ec : @cols - 1
    lines << @grid[r][from..to].map { |cell| cell.char }.join.rstrip
  end
  lines.join("\n")
end

#set_clipboard(text) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 873

def set_clipboard(text)
  @clipboard_handler&.call(:set, text)
end

#set_current_command_text(text) ⇒ Object

Attach the literal command text to the most recently opened mark. The host calls this at submit time (between OSC 133 ;B and ;C) so click-to-rerun can recover the command text from a clicked prompt row long after submission.



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# File 'lib/echoes/screen.rb', line 821

def set_current_command_text(text)
  return unless @current_command_mark
  @current_command_mark[:command_text] = text
end

#set_graphics(params) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 500

def set_graphics(params)
  params = [0] if params.empty?
  i = 0
  while i < params.length
    p = params[i]

    # Handle colon sub-parameter arrays (e.g. [38, 2, nil, R, G, B])
    if p.is_a?(Array)
      apply_sgr_subparams(p)
      i += 1
      next
    end

    case p
    when 0, nil
      @attrs.reset!
    when 1
      @attrs.bold = true
    when 2
      @attrs.faint = true
    when 3
      @attrs.italic = true
    when 4
      @attrs.underline = true
    when 7
      @attrs.inverse = true
    when 5, 6
      @attrs.blink = true
    when 8
      @attrs.concealed = true
    when 9
      @attrs.strikethrough = true
    when 22
      @attrs.bold = false
      @attrs.faint = false
    when 23
      @attrs.italic = false
    when 24
      @attrs.underline = false
    when 27
      @attrs.inverse = false
    when 25
      @attrs.blink = false
    when 28
      @attrs.concealed = false
    when 29
      @attrs.strikethrough = false
    when 30..37
      @attrs.fg = p - 30
    when 38
      if params[i + 1] == 2 && params[i + 2] && params[i + 3] && params[i + 4]
        @attrs.fg = [params[i + 2], params[i + 3], params[i + 4]]
        i += 4
      elsif params[i + 1] == 5 && params[i + 2]
        @attrs.fg = params[i + 2]
        i += 2
      end
    when 39
      @attrs.fg = nil
    when 40..47
      @attrs.bg = p - 40
    when 48
      if params[i + 1] == 2 && params[i + 2] && params[i + 3] && params[i + 4]
        @attrs.bg = [params[i + 2], params[i + 3], params[i + 4]]
        i += 4
      elsif params[i + 1] == 5 && params[i + 2]
        @attrs.bg = params[i + 2]
        i += 2
      end
    when 49
      @attrs.bg = nil
    when 90..97
      @attrs.fg = p - 90 + 8
    when 100..107
      @attrs.bg = p - 100 + 8
    end
    i += 1
  end
end

#set_hyperlink(uri) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 704

def set_hyperlink(uri)
  @attrs.hyperlink = uri
end

#set_scroll_region(top, bottom) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 492

def set_scroll_region(top, bottom)
  @pending_wrap = false
  @scroll_top = clamp_row(top)
  @scroll_bottom = clamp_row(bottom)
  @cursor.row = 0
  @cursor.col = 0
end

#set_tab_stop ⇒ Object 



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# File 'lib/echoes/screen.rb', line 354

def set_tab_stop
  @tab_stops << @cursor.col unless @tab_stops.include?(@cursor.col)
  @tab_stops.sort!
end

#show_cursor ⇒ Object 



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# File 'lib/echoes/screen.rb', line 975

def show_cursor
  @cursor.visible = true
end

#soft_reset ⇒ Object 



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# File 'lib/echoes/screen.rb', line 1012

def soft_reset
  @attrs = Cell.new
  @cursor.visible = true
  @saved_cursor = nil
  @origin_mode = false
  @auto_wrap = true
  @insert_mode = false
  @application_cursor_keys = false
  @bracketed_paste_mode = false
  @focus_reporting = false
  @charset_g0 = :ascii
  @charset_g1 = :ascii
  @charset_g2 = :ascii
  @charset_g3 = :ascii
  @active_charset = 0
  @single_shift = nil
  @cursor_style = 0
  @tab_stops = default_tab_stops
  @scroll_top = 0
  @scroll_bottom = @rows - 1
  @pending_wrap = false
end

#switch_to_alt_screen ⇒ Object 



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# File 'lib/echoes/screen.rb', line 907

def switch_to_alt_screen
  return if @using_alt_screen

  @main_grid = @grid
  @main_line_wrapped = @line_wrapped
  @main_cursor = [@cursor.row, @cursor.col, @cursor.visible]
  @main_scroll_top = @scroll_top
  @main_scroll_bottom = @scroll_bottom
  @main_saved_cursor = @saved_cursor
  @main_scrollback = @scrollback
  @main_scrollback_wrapped = @scrollback_wrapped
  @main_rows = @rows
  @main_cols = @cols

  @grid = Array.new(@rows) { Array.new(@cols) { Cell.new } }
  @line_wrapped = Array.new(@rows, false)
  @cursor = Cursor.new
  @attrs = Cell.new
  @scroll_top = 0
  @scroll_bottom = @rows - 1
  @saved_cursor = nil
  @scrollback = []
  @scrollback_wrapped = []
  @pending_wrap = false
  @using_alt_screen = true
  mark_all_dirty
end

#switch_to_main_screen ⇒ Object 



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# File 'lib/echoes/screen.rb', line 935

def switch_to_main_screen
  return unless @using_alt_screen

  current_rows = @rows
  current_cols = @cols

  @grid = @main_grid
  @line_wrapped = @main_line_wrapped
  @cursor = Cursor.new
  @cursor.row, @cursor.col, @cursor.visible = @main_cursor
  @scroll_top = @main_scroll_top
  @scroll_bottom = @main_scroll_bottom
  @saved_cursor = @main_saved_cursor
  @scrollback = @main_scrollback
  @scrollback_wrapped = @main_scrollback_wrapped
  @rows = @main_rows
  @cols = @main_cols
  @attrs = Cell.new

  @main_grid = nil
  @main_line_wrapped = nil
  @main_cursor = nil
  @main_scroll_top = nil
  @main_scroll_bottom = nil
  @main_saved_cursor = nil
  @main_scrollback = nil
  @main_scrollback_wrapped = nil
  @main_rows = nil
  @main_cols = nil
  @pending_wrap = false
  @using_alt_screen = false

  # If terminal was resized while in alt screen, adjust the restored main grid
  if current_rows != @rows || current_cols != @cols
    resize(current_rows, current_cols)
  end

  mark_all_dirty
end

#tab ⇒ Object 



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# File 'lib/echoes/screen.rb', line 340

def tab
  @pending_wrap = false
  next_stop = @tab_stops.find { |s| s > @cursor.col }
  @cursor.col = next_stop ? [next_stop, @cols - 1].min : @cols - 1
end

#text_for_command_output(mark) ⇒ Object

Extract the visible text of a command’s output region. ‘mark` is one of the entries from `@command_marks`. Rows that have scrolled off the front of the scrollback are silently skipped — the text is no longer recoverable. Returns “” when the mark is incomplete (no :output_start or :output_end yet).



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# File 'lib/echoes/screen.rb', line 794

def text_for_command_output(mark)
  return '' unless mark && mark[:output_start] && mark[:output_end]
  from = mark[:output_start]
  to   = mark[:output_end]
  return '' if to <= from
  sb_size = @scrollback.size
  lines = []
  (from...to).each do |abs_row|
    row = abs_row < 0 ? nil :
          abs_row < sb_size ? @scrollback[abs_row] :
          @grid[abs_row - sb_size]
    next unless row
    lines << row.map { |c| c.char || ' ' }.join.rstrip
  end
  lines.join("\n")
end

#to_text ⇒ Object 



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# File 'lib/echoes/screen.rb', line 983

def to_text
  @grid.map { |row| row.map { |cell| cell.char }.join.rstrip }.join("\n").rstrip
end

#using_alt_screen? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/echoes/screen.rb', line 903

def using_alt_screen?
  @using_alt_screen
end

#word_boundaries_at(row, col) ⇒ Object 



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# File 'lib/echoes/screen.rb', line 997

def word_boundaries_at(row, col)
  return nil if row < 0 || row >= @rows || col < 0 || col >= @cols

  line = @grid[row]
  cls = char_class(line[col].char)

  start_col = col
  start_col -= 1 while start_col > 0 && char_class(line[start_col - 1].char) == cls

  end_col = col
  end_col += 1 while end_col < @cols - 1 && char_class(line[end_col + 1].char) == cls

  [start_col, end_col]
end