Class: Fatty::Renderer::Curses

Inherits:
Fatty::Renderer show all
Includes:
Curses::WindowStyling
Defined in:
lib/fatty/renderer/curses.rb

Constant Summary

Constants included from Curses::WindowStyling

Curses::WindowStyling::ATTR_FLAGS

Constants inherited from Fatty::Renderer

CORNER_STYLES, FRAME_STYLES, POPUP_SELECTED_GUTTER, POPUP_UNSELECTED_GUTTER

Instance Attribute Summary

Attributes inherited from Fatty::Renderer

#context, #palette, #screen

Instance Method Summary collapse

Methods included from Curses::WindowStyling

#attr_flag, #pair_attr

Methods inherited from Fatty::Renderer

#apply_theme!, #flush_ansi_draws, #invalidate!, #queue_ansi_line, #queue_ansi_popup_line, #queue_ansi_rect, #queue_ansi_segments_line

Constructor Details

#initialize ⇒ Curses

Returns a new instance of Curses.



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# File 'lib/fatty/renderer/curses.rb', line 10

def initialize(...)
  super
end

Instance Method Details

#begin_frame ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 352

def begin_frame
end

#finish_frame ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 355

def finish_frame
  ::Curses.doupdate
end

#render_alert(alert) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 94

def render_alert(alert)
  state = alert_state(alert)
  return if state == @last_alert_state

  @last_alert_state = state

  win = context.alert_win
  return unless win

  text = alert ? alert.format : ""
  text = Fatty::Ansi.strip(text)
  role = alert ? alert.role : :alert
  attr = pair_attr(role, fallback: pair_attr(:alert, fallback: ::Curses::A_REVERSE))
  cols = win.respond_to?(:maxx) ? win.maxx : screen.alert_rect.cols

  win.bkgdset(attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(attr)
  win.setpos(0, 0)
  win.addstr(text.ljust(cols)[0, cols])

  stage_window(win)
end

#render_input_field(field, role: :input) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 61

def render_input_field(field, role: :input)
  state = input_field_state(field)
  return if state == @last_input_state

  @last_input_state = state

  win = context.input_win
  return unless win

  width = win.respond_to?(:maxx) ? win.maxx : screen.cols
  base_attr = pair_attr(role, fallback: ::Curses::A_NORMAL)
  region_attr = pair_attr(:region, fallback: ::Curses::A_REVERSE)
  suggestion_attr = pair_attr(:input_suggestion, fallback: base_attr)

  win.bkgdset(base_attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(base_attr)

  render_field_into(
    win: win,
    field: field,
    row: 0,
    width: width,
    base_role: role,
    base_attr: base_attr,
    region_attr: region_attr,
    suggestion_attr: suggestion_attr,
  )
  cursor_x = field.cursor_x.to_i.clamp(0, [width - 1, 0].max)
  win.setpos(0, cursor_x)
  stage_window(win)
end

#render_output(output, viewport:, highlights: nil) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 40

def render_output(output, viewport:, highlights: nil)
  lines = viewport.slice(output.lines)
  normalized = normalized_highlights(highlights)

  curr = output_state(
    viewport: viewport,
    lines: lines,
    highlights: normalized,
  )

  prev = @last_output_state

  if prev && can_incrementally_scroll_output?(prev, curr)
    scroll_output_window_delta!(prev: prev, curr: curr)
  else
    draw_output_lines(lines, viewport: viewport, highlights: normalized)
  end

  @last_output_state = curr
end

#render_pager_field(field, row:, role: :pager_status) ⇒ Object

Render an InputField-like status line.

Used for pager mode ("--More--" etc.). It intentionally does not move the cursor; ShellSession decides whether to show a cursor in paging vs input mode.

Curses uses a derived one-line window to isolate the pager/search field from output_win scrolling/background effects.

Truecolor renders the same field as an ANSI overlay at absolute coordinates, so no derived window is needed there.



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# File 'lib/fatty/renderer/curses.rb', line 129

def render_pager_field(field, row:, role: :pager_status)
  win = context.output_win
  return unless win

  cols = win.respond_to?(:maxx) ? win.maxx : @screen.cols
  attr = pair_attr(role, fallback: ::Curses::A_REVERSE)

  field_win = win.derwin(1, cols, row, 0)
  field_win.bkgdset(attr) if field_win.respond_to?(:bkgdset)
  field_win.erase
  field_win.attrset(attr)

  render_field_into(
    win: field_win,
    field: field,
    row: 0,
    width: cols,
    base_attr: attr,
    region_attr: pair_attr(:region, fallback: ::Curses::A_REVERSE),
    suggestion_attr: pair_attr(:input_suggestion, fallback: attr),
    base_role: role,
  )

  field_win.noutrefresh
  stage_window(win)
ensure
  field_win&.close if field_win&.respond_to?(:close)
end

#render_popup(session:) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 158

def render_popup(session:)
  state = popup_state(session)
  return if state == @last_popup_state

  @last_popup_state = state

  win = session.win
  return unless win

  width = win.maxx
  height = win.maxy
  return if width < 2 || height < 2

  win.erase

  frame_attr = pair_attr(:popup_frame, fallback: ::Curses::A_NORMAL)
  popup_attr = pair_attr(:popup, fallback: ::Curses::A_NORMAL)
  input_attr = pair_attr(:popup_input, fallback: ::Curses::A_REVERSE)
  selected_attr = pair_attr(:popup_selection, fallback: ::Curses::A_REVERSE)
  counts_attr = pair_attr(:popup_counts, fallback: popup_attr)

  win.attrset(frame_attr)
  draw_popup_frame(win, width: width, height: height)

  if session.title && !session.title.empty?
    title = Fatty::Ansi.strip(session.title.to_s).tr("\r\n", " ")
    title = Fatty::Ansi.truncate_visible(" #{title} ", [width - 4, 0].max)

    unless title.empty?
      win.setpos(0, 2)
      win.addstr(title)
    end
  end

  inner_h = height - 2
  inner_w = width - 2
  return if inner_h <= 0 || inner_w <= 0

  inner = win.derwin(inner_h, inner_w, 1, 1)
  inner.bkgdset(popup_attr) if inner.respond_to?(:bkgdset)
  inner.erase

  row = 0

  if session.message && !session.message.empty?
    message = Fatty::Ansi.strip(session.message.to_s).tr("\r\n", " ")
    message = Fatty::Ansi.truncate_visible(message, inner_w)

    inner.attrset(popup_attr)
    inner.setpos(row, 0)
    inner.addstr(message.ljust(inner_w))
    row += 1
  end

  counts_present = !!session.counts
  input_row = inner_h - 1
  counts_row = counts_present ? input_row - 1 : nil

  list_row = row
  list_h = input_row - list_row
  list_h -= 1 if counts_present
  list_h = [list_h, 0].max

  items = session.displayed
  selected = session.selected
  start = session.scroll_start(list_h: list_h)

  (0...list_h).each do |offset|
    item_index = start + offset
    item_selected = item_index == selected
    attr = item_selected ? selected_attr : popup_attr

    line = ""
    if item_index < items.length
      item = items[item_index]
      gutter = session.gutter_for(item: item, selected: item_selected)
      text = Fatty::Ansi.strip(item.to_s).tr("\r\n", " ")
      available = [inner_w - Fatty::Ansi.visible_length(gutter), 0].max
      text = Fatty::Ansi.truncate_visible(text, available)
      line = Fatty::Ansi.truncate_visible(gutter + text, inner_w)
    end

    inner.attrset(attr)
    inner.setpos(list_row + offset, 0)
    inner.addstr(line.ljust(inner_w))
  end

  if counts_present && counts_row && counts_row >= 0
    counts_text = Fatty::Ansi.truncate_visible(popup_counts_text(session), inner_w)

    inner.attrset(counts_attr)
    inner.setpos(counts_row, 0)
    inner.addstr(counts_text.ljust(inner_w))
  end

  render_field_into(
    win: inner,
    field: session.field,
    row: input_row,
    width: inner_w,
    base_role: :popup_input,
    base_attr: input_attr,
    region_attr: pair_attr(:region, fallback: ::Curses::A_REVERSE),
    suggestion_attr: pair_attr(:input_suggestion, fallback: input_attr),
  )

  cursor_x = session.field.cursor_x.to_i.clamp(0, [inner_w - 1, 0].max)
  win.setpos(1 + input_row, 1 + cursor_x)

  stage_window(win)
rescue RuntimeError => e
  raise unless e.message.include?("closed window") ||
               e.message.include?("already closed window")

  nil
ensure
  inner&.close if inner&.respond_to?(:close)
end

#render_prompt_popup(session:) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 277

def render_prompt_popup(session:)
  state = prompt_popup_state(session)
  return if state == @last_prompt_popup_state

  @last_prompt_popup_state = state

  win = session.win
  return unless win

  width = win.maxx
  height = win.maxy

  win.erase

  frame_attr = pair_attr(:popup_frame, fallback: ::Curses::A_NORMAL)
  popup_attr = pair_attr(:popup, fallback: ::Curses::A_NORMAL)
  input_attr = pair_attr(:popup_input, fallback: ::Curses::A_REVERSE)

  win.attrset(frame_attr)
  draw_popup_frame(win, width: width, height: height)

  if session.title && !session.title.empty?
    win.setpos(0, 2)
    win.addstr(" #{Fatty::Ansi.strip(session.title)} ")
  end

  inner_h = height - 2
  inner_w = width - 2
  return if inner_h <= 0 || inner_w <= 0

  inner = win.derwin(inner_h, inner_w, 1, 1)
  inner.bkgdset(popup_attr) if inner.respond_to?(:bkgdset)
  inner.erase
  inner.attrset(popup_attr)

  input_row = inner_h - 1

  if session.message && !session.message.empty?
    message = Fatty::Ansi.strip(session.message.to_s).tr("\r\n", " ")
    message = Fatty::Ansi.truncate_visible(message, inner_w)

    inner.setpos(0, 0)
    inner.addstr(message.ljust(inner_w))
  end

  render_field_into(
    win: inner,
    field: session.field,
    row: input_row,
    width: inner_w,
    base_role: :popup_input,
    base_attr: input_attr,
    region_attr: pair_attr(:region, fallback: ::Curses::A_REVERSE),
    suggestion_attr: pair_attr(:input_suggestion, fallback: input_attr),
  )

  cursor_x = session.field.cursor_x.to_i.clamp(0, [inner_w - 1, 0].max)
  win.setpos(1 + input_row, 1 + cursor_x)

  stage_window(inner)
  stage_window(win)
ensure
  inner&.close if inner&.respond_to?(:close)
end

#render_status(text, role: :status_info) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 14

def render_status(text, role: :status_info)
  state = status_state(text, role)
  return if state == @last_status_state

  @last_status_state = state

  win = context.status_win
  return unless win

  rows = screen.status_rect.rows
  cols = screen.status_rect.cols
  base_attr = pair_attr(role, fallback: ::Curses::A_REVERSE)

  win.bkgdset(base_attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(base_attr)

  status_render_lines(text, width: cols, max_rows: rows).each_with_index do |line, row|
    win.setpos(row, 0)
    rendered = Fatty::Ansi.truncate_visible(line, cols)
    padding = [cols - Fatty::Ansi.visible_length(rendered), 0].max
    win.addstr(rendered + (" " * padding))
  end
  stage_window(win)
end

#restore_cursor(field) ⇒ Object 



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# File 'lib/fatty/renderer/curses.rb', line 342

def restore_cursor(field)
  win = context.input_win
  return unless win

  cols = win.respond_to?(:maxx) ? win.maxx : @screen.input_rect.cols
  x = field.cursor_x.to_i.clamp(0, [cols - 1, 0].max)
  win.setpos(0, x)
  stage_window(win)
end

#restore_output_cursor(field, row:) ⇒ Object

Restore cursor into the output window at a specific output-win row. row: is 0..(screen.output_rect.rows-1), NOT an absolute screen row.



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# File 'lib/fatty/renderer/curses.rb', line 361

def restore_output_cursor(field, row:)
  win = context.output_win
  cols = @screen.cols

  x = field.cursor_x.to_i
  x = x.clamp(0, [cols - 1, 0].max)

  if context.truecolor
    row0 = @screen.output_rect.row
    col0 = @screen.output_rect.col
    cols = @screen.output_rect.cols

    @pending_ansi_draws << {
      type: :cursor,
      row: row0 + row,
      col: col0 + x.clamp(0, [cols - 1, 0].max),
    }
    return
  end
  @frame_touched = true
  win.setpos(row, x)
  stage_window(win)
end