Class: Clacky::UI2::LayoutManager

Inherits:
Object
  • Object
show all
Defined in:
lib/clacky/ui2/layout_manager.rb

Overview

LayoutManager coordinates the split-screen layout:

[ scrollable output area ]
[ gap / todo / input (fixed) ]

Responsibilities:

  • Own an OutputBuffer (logical source of truth for output content).

  • Translate buffer mutations into screen paints, handling:

    • Native terminal scrolling when output overflows the output area.

    • Committing scrolled lines to the buffer (so they are never repainted from the buffer again — prevents the classic “double render on scroll up” bug).

  • Keep the fixed area (gap + todo + input) pinned at the bottom of the screen, repainting it only when it is dirty.

Public API (id-based, preferred):

append(content, kind: :text) -> id     # add entry, returns id
replace_entry(id, content)              # edit entry's content
remove_entry(id)                        # drop entry

Legacy API (shims, still used by InlineInput / progress):

append_output(content) -> id            # alias for append
update_last_line(content, old_n, id: nil)  # uses id if given
remove_last_line(n, id: nil)               # uses id if given

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input_area:, todo_area: nil) ⇒ LayoutManager

Returns a new instance of LayoutManager.



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# File 'lib/clacky/ui2/layout_manager.rb', line 35

def initialize(input_area:, todo_area: nil)
  @screen       = ScreenBuffer.new
  @input_area   = input_area
  @todo_area    = todo_area
  @buffer       = OutputBuffer.new
  @render_mutex = Mutex.new

  @output_row              = 0  # Next output row to paint into
  @last_fixed_area_height  = 0
  @fullscreen_mode         = false
  @resize_pending          = false

  # Tracks the most recent append's id so the legacy
  # update_last_line / remove_last_line shims still work without the
  # caller threading an id through.
  @last_append_id          = nil

  calculate_layout
  setup_resize_handler
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

Returns the value of attribute buffer.



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# File 'lib/clacky/ui2/layout_manager.rb', line 33

def buffer
  @buffer
end

#input_area ⇒ Object (readonly)

Returns the value of attribute input_area.



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# File 'lib/clacky/ui2/layout_manager.rb', line 33

def input_area
  @input_area
end

#screen ⇒ Object (readonly)

Returns the value of attribute screen.



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# File 'lib/clacky/ui2/layout_manager.rb', line 33

def screen
  @screen
end

#todo_area ⇒ Object (readonly)

Returns the value of attribute todo_area.



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# File 'lib/clacky/ui2/layout_manager.rb', line 33

def todo_area
  @todo_area
end

Instance Method Details

#append(content, kind: :text) ⇒ Object

Append an output entry. Returns the entry id so callers can later replace_entry / remove_entry. Multi-line content is wrapped and stored as one logical entry.



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# File 'lib/clacky/ui2/layout_manager.rb', line 92

def append(content, kind: :text)
  return nil if content.nil?
  content = sanitize(content)

  @render_mutex.synchronize do
    lines = wrap_content_to_lines(content)
    id    = @buffer.append(lines, kind: kind)
    @last_append_id = id

    paint_new_lines(lines) unless @fullscreen_mode
    render_fixed_areas
    screen.flush
    id
  end
end

#append_output(content) ⇒ Object

Legacy: append, return id (callers that ignore it still work).



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# File 'lib/clacky/ui2/layout_manager.rb', line 109

def append_output(content)
  append(content)
end

#calculate_display_width(text) ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 623

def calculate_display_width(text)
  width = 0
  text.each_char { |c| width += char_display_width(c) }
  width
end

#calculate_layout ⇒ Object

Layout math



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# File 'lib/clacky/ui2/layout_manager.rb', line 60

def calculate_layout
  todo_height  = @todo_area&.height || 0
  input_height = @input_area.required_height
  gap_height   = 1

  @output_height = screen.height - gap_height - todo_height - input_height
  @output_height = [1, @output_height].max

  @gap_row   = @output_height
  @todo_row  = @gap_row + gap_height
  @input_row = @todo_row + todo_height

  @input_area.row = @input_row
end

#char_display_width(char) ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 602

def char_display_width(char)
  code = char.ord
  if (code >= 0x1100 && code <= 0x115F) ||
     (code >= 0x2329 && code <= 0x232A) ||
     (code >= 0x2E80 && code <= 0x303E) ||
     (code >= 0x3040 && code <= 0xA4CF) ||
     (code >= 0xAC00 && code <= 0xD7A3) ||
     (code >= 0xF900 && code <= 0xFAFF) ||
     (code >= 0xFE10 && code <= 0xFE19) ||
     (code >= 0xFE30 && code <= 0xFE6F) ||
     (code >= 0xFF00 && code <= 0xFF60) ||
     (code >= 0xFFE0 && code <= 0xFFE6) ||
     (code >= 0x1F300 && code <= 0x1F9FF) ||
     (code >= 0x20000 && code <= 0x2FFFD) ||
     (code >= 0x30000 && code <= 0x3FFFD)
    2
  else
    1
  end
end

#cleanup_screen ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 369

def cleanup_screen
  @render_mutex.synchronize do
    fixed_start = fixed_area_start_row
    (fixed_start...screen.height).each do |row|
      screen.move_cursor(row, 0)
      screen.clear_line
    end
    screen.move_cursor([@output_row, 0].max, 0)
    print "\r"
    screen.show_cursor
    screen.flush
  end
end

#clear_output ⇒ Object

/clear: wipe output area + buffer, keep fixed area.



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# File 'lib/clacky/ui2/layout_manager.rb', line 384

def clear_output
  @render_mutex.synchronize do
    max_row = fixed_area_start_row
    (0...max_row).each do |row|
      screen.move_cursor(row, 0)
      screen.clear_line
    end
    @output_row     = 0
    @last_append_id = nil
    @buffer.clear
    render_fixed_areas
    screen.flush
  end
end

#enter_fullscreen(lines, hint: "Press Ctrl+O to return") ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 682

def enter_fullscreen(lines, hint: "Press Ctrl+O to return")
  @render_mutex.synchronize do
    return if @fullscreen_mode
    @fullscreen_mode = true
    @fullscreen_hint = hint

    # Switch to alternate screen, clear it, position top-left.
    print "\e[?1049h\e[2J\e[H"
    $stdout.flush
    render_fullscreen_content(lines)
  end
end

#exit_fullscreen ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 703

def exit_fullscreen
  @render_mutex.synchronize do
    return unless @fullscreen_mode
    @fullscreen_mode = false
    @fullscreen_hint = nil
    print "\e[?1049l"
    $stdout.flush
  end
end

#fixed_area_height ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 75

def fixed_area_height
  todo_h  = @todo_area&.height || 0
  input_h = @input_area.required_height
  1 + todo_h + input_h
end

#fixed_area_start_row ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 81

def fixed_area_start_row
  screen.height - fixed_area_height
end

#fullscreen_mode? ⇒ Boolean

Fullscreen (alternate screen buffer)

Returns:

  • (Boolean) 


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# File 'lib/clacky/ui2/layout_manager.rb', line 678

def fullscreen_mode?
  @fullscreen_mode
end

#initialize_screen ⇒ Object

Lifecycle + layout



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# File 'lib/clacky/ui2/layout_manager.rb', line 362

def initialize_screen
  screen.clear_screen
  screen.hide_cursor
  @output_row = 0
  render_all
end

#live_entry?(id) ⇒ Boolean

Is this id still a live (not yet committed to scrollback) entry? Cheap probe callers use before deciding between replace vs append.

Returns:

  • (Boolean) 


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# File 'lib/clacky/ui2/layout_manager.rb', line 157

def live_entry?(id)
  return false if id.nil?
  @buffer.live?(id)
end

#position_inline_input_cursor(inline_input) ⇒ Object

Position cursor for inline input in output area.



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# File 'lib/clacky/ui2/layout_manager.rb', line 462

def position_inline_input_cursor(inline_input)
  return unless inline_input
  width = screen.width
  wrap_row, wrap_col = inline_input.cursor_position_for_display(width)
  line_count = inline_input.line_count(width)

  cursor_row = @output_row - line_count + wrap_row
  cursor_col = wrap_col
  screen.move_cursor(cursor_row, cursor_col)
  screen.flush
end

#process_pending_resize ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 661

def process_pending_resize
  return unless @resize_pending
  @resize_pending = false
  handle_resize_safely
end

#recalculate_layout ⇒ Object

Recalculate layout after input height changed. If the layout moved, clear the old fixed area rows and re-render at the new position.



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# File 'lib/clacky/ui2/layout_manager.rb', line 401

def recalculate_layout
  @render_mutex.synchronize do
    old_gap_row   = @gap_row
    old_input_row = @input_row

    calculate_layout

    if @input_row != old_input_row
      ([old_gap_row, 0].max...screen.height).each do |row|
        screen.move_cursor(row, 0)
        screen.clear_line
      end

      if input_area.paused?
        # Input paused (InlineInput active) — fixed area shrank, so the
        # cleared rows are now part of the output area. Repaint from
        # buffer to fill them in.
        render_output_from_buffer
      else
        render_fixed_areas
      end
      screen.flush
    end
  end
end

#refresh_fullscreen(lines) ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 695

def refresh_fullscreen(lines)
  @render_mutex.synchronize do
    return unless @fullscreen_mode
    print "\e[2J\e[H"
    render_fullscreen_content(lines)
  end
end

#remove_entry(id) ⇒ Object

Remove an entry. If it’s the last live entry, the screen area it occupied is cleared and the output cursor rolls back.



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# File 'lib/clacky/ui2/layout_manager.rb', line 164

def remove_entry(id)
  return if id.nil?

  @render_mutex.synchronize do
    entry = @buffer.entry_by_id(id)
    return if entry.nil? || entry.committed

    height = entry.height
    # Check whether this entry is the tail of live entries. Only tail
    # removal is cheap — mid-buffer removal would require a full
    # output repaint. In practice only the progress / inline-input
    # entries are removed, and they are always the tail.
    is_tail = @buffer.live_entries.last&.id == id

    @buffer.remove(id)
    @last_append_id = nil if @last_append_id == id

    unless @fullscreen_mode
      if is_tail
        clear_tail_rows(height)
      else
        # Non-tail removal: rebuild the entire output area from buffer
        render_output_from_buffer
      end
    end

    render_fixed_areas
    screen.flush
  end
end

#remove_last_line(line_count = 1, id: nil) ⇒ Object

Remove the most recently appended entry (or the given id).



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# File 'lib/clacky/ui2/layout_manager.rb', line 208

def remove_last_line(line_count = 1, id: nil)
  target = id || @last_append_id
  remove_entry(target) if target
end

#render_all ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 427

def render_all
  @render_mutex.synchronize { render_all_internal }
end

#render_fixed_areas(skip_buffer_rerender: false) ⇒ Object

Repaint gap + todo + input at the bottom of the screen.

Parameters:

  • skip_buffer_rerender (Boolean) (defaults to: false) —

    When true, skip repainting the output area from the buffer even if the fixed-area height changed. Used by the scroll path in paint_new_lines — the caller has just written the correct content directly; a full buffer repaint would duplicate it in terminal scrollback.



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# File 'lib/clacky/ui2/layout_manager.rb', line 511

def render_fixed_areas(skip_buffer_rerender: false)
  # When input is paused (InlineInput active), the "input area" is
  # rendered inline with output. Nothing to paint down here.
  return if input_area.paused?
  return if @fullscreen_mode

  current_fixed_height = fixed_area_height
  start_row            = fixed_area_start_row
  gap_row              = start_row
  todo_row             = gap_row + 1

  # Fixed-area height changed (e.g. multi-line input appeared or
  # command-suggestions popped) → repaint the output from buffer so
  # nothing is hidden.
  if !skip_buffer_rerender &&
     @last_fixed_area_height > 0 &&
     @last_fixed_area_height != current_fixed_height
    render_output_from_buffer
  end
  @last_fixed_area_height = current_fixed_height

  # gap line
  screen.move_cursor(gap_row, 0)
  screen.clear_line

  # todo
  @todo_area.render(start_row: todo_row) if @todo_area&.visible?

  # input (renders its own visual cursor)
  input_row = todo_row + (@todo_area&.height || 0)
  input_area.render(start_row: input_row, width: screen.width)
end

#render_input ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 438

def render_input
  @render_mutex.synchronize do
    render_fixed_areas
    screen.flush
  end
end

#render_output ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 431

def render_output
  @render_mutex.synchronize do
    render_fixed_areas
    screen.flush
  end
end

#replace_entry(id, content) ⇒ Object

Replace an existing entry’s content. The screen is updated in place if the entry still lives in the output area; otherwise (committed to scrollback) this is a silent no-op.



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# File 'lib/clacky/ui2/layout_manager.rb', line 116

def replace_entry(id, content)
  return if id.nil? || content.nil?
  content = sanitize(content)

  @render_mutex.synchronize do
    entry = @buffer.entry_by_id(id)
    return if entry.nil? || entry.committed

    old_lines = entry.lines.dup
    new_lines = wrap_content_to_lines(content)
    @buffer.replace(id, new_lines)

    unless @fullscreen_mode
      # repaint_entry_in_place relies on the entry being the tail of
      # live entries (it computes the entry's top row from @output_row
      # and old height). When the entry is NOT the tail — e.g. a
      # background progress ticker fires after a newer entry was
      # appended — that assumption silently corrupts the screen:
      # the new frame gets painted at the tail's row, clobbering the
      # latest log line, and @output_row is reset to a position that
      # predates appended-but-still-live entries. On next scroll,
      # those stale-now-present rows end up in terminal scrollback as
      # duplicated lines (the user-visible "output repeats" bug).
      #
      # For non-tail replaces, fall back to a full rebuild of the
      # output area from the buffer. Slower, but correct regardless
      # of where the entry lives.
      is_tail = @buffer.live_entries.last&.id == id
      if is_tail
        repaint_entry_in_place(entry, old_lines, new_lines)
      else
        render_output_from_buffer
      end
    end
    render_fixed_areas
    screen.flush
  end
end

#rerender_all ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 445

def rerender_all
  @render_mutex.synchronize do
    screen.clear_screen
    render_output_from_buffer
    render_fixed_areas
    screen.flush
  end
end

#restore_cursor_to_input ⇒ Object

Restore cursor to input area (used after dialogs).



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# File 'lib/clacky/ui2/layout_manager.rb', line 455

def restore_cursor_to_input
  input_row = fixed_area_start_row + 1 + (@todo_area&.height || 0)
  input_area.position_cursor(input_row)
  screen.show_cursor
end

#restore_screen ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 713

def restore_screen
  @render_mutex.synchronize do
    screen.clear_screen
    screen.hide_cursor
    render_all_internal
  end
end

#scroll_output_down(_lines = 1) ⇒ Object 



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# File 'lib/clacky/ui2/layout_manager.rb', line 551

def scroll_output_down(_lines = 1); end

#scroll_output_up(_lines = 1) ⇒ Object

Legacy no-ops — terminal handles native scroll natively.



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# File 'lib/clacky/ui2/layout_manager.rb', line 550

def scroll_output_up(_lines = 1); end

#update_last_line(content, old_line_count = nil, id: nil) ⇒ Object

Update the most recently appended entry. Prefer passing id:; when omitted the last-append id is used. old_line_count is ignored (buffer knows the true height).



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# File 'lib/clacky/ui2/layout_manager.rb', line 202

def update_last_line(content, old_line_count = nil, id: nil)
  target = id || @last_append_id
  replace_entry(target, content) if target
end

#update_todos(todos) ⇒ Object

Update todos display; recalculates layout if height changed.



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# File 'lib/clacky/ui2/layout_manager.rb', line 475

def update_todos(todos)
  return unless @todo_area

  @render_mutex.synchronize do
    old_height  = @todo_area.height
    old_gap_row = @gap_row

    @todo_area.update(todos)
    new_height = @todo_area.height

    if old_height != new_height
      calculate_layout
      ([old_gap_row, 0].max...screen.height).each do |row|
        screen.move_cursor(row, 0)
        screen.clear_line
      end
    end

    render_fixed_areas
    screen.flush
  end
end

#wrap_long_line(line) ⇒ Object

Wrap a long line into multiple lines based on terminal width. Considers display width of multi-byte characters (e.g., Chinese characters).



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# File 'lib/clacky/ui2/layout_manager.rb', line 561

def wrap_long_line(line)
  return [""] if line.nil? || line.empty?

  max_width = screen.width
  return [line] if max_width <= 0

  # Strip ANSI codes for width calculation
  visible_line = line.gsub(/\e\[[0-9;]*m/, '')

  display_width = calculate_display_width(visible_line)
  return [line] if display_width <= max_width

  wrapped      = []
  current_line = ""
  current_width = 0
  ansi_codes   = []

  segments = line.split(/(\e\[[0-9;]*m)/)

  segments.each do |segment|
    if segment =~ /^\e\[[0-9;]*m$/
      ansi_codes << segment
      current_line += segment
    else
      segment.each_char do |char|
        char_width = char_display_width(char)
        if current_width + char_width > max_width && !current_line.empty?
          wrapped << current_line
          current_line = ansi_codes.join
          current_width = 0
        end
        current_line += char
        current_width += char_width
      end
    end
  end

  wrapped << current_line unless current_line.empty? || current_line == ansi_codes.join
  wrapped.empty? ? [""] : wrapped
end