Module: VSM::Lens::TUI

Defined in:
lib/vsm/lens/tui.rb

Class Method Summary collapse

Class Method Details

.box(title, lines, width) ⇒ Object 



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# File 'lib/vsm/lens/tui.rb', line 75

def self.box(title, lines, width)
  out  = +"+" + "-"*(width-2) + "+\n"
  out << "| #{title.ljust(width-4)} |\n"
  out << "+" + "-"*(width-2) + "+\n"
  lines.each do |l|
    out << "| #{l.ljust(width-4)} |\n"
  end
  out << "+" + "-"*(width-2) + "+\n"
  out
end

.draw(ring) ⇒ Object 



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# File 'lib/vsm/lens/tui.rb', line 35

def self.draw(ring)
  cols, rows = IO.console.winsize.reverse # => [rows, cols]
  rows ||= 24; cols ||= 80
  system("printf", "\e[2J\e[H") # clear

  # Split: left sessions, right timeline
  left_w  = [28, cols * 0.3].max.to_i
  right_w = cols - left_w - 1
  puts header("VSM Lens TUI — press 'q' to quit", cols)

  # Sessions (left)
  sessions = Hash.new { |h,k| h[k] = { count: 0, last: "" } }
  ring.each do |ev|
    sid = ev.dig(:meta, :session_id) or next
    sessions[sid][:count] += 1
    sessions[sid][:last]   = ev[:ts]
  end
  sess_lines = sessions.sort_by { |_id, s| s[:last].to_s }.reverse.first(rows-3).map do |sid, s|
    "#{sid[0,8]}  #{s[:count].to_s.rjust(5)}  #{s[:last]}"
  end

  puts box("Sessions", sess_lines, left_w)

  # Timeline (right)
  tl = ring.last(rows-3).map do |ev|
    kind = ev[:kind].to_s.ljust(16)
    sid  = ev.dig(:meta, :session_id)&.slice(0,8) || "–"
    txt  = case ev[:payload]
           when String then ev[:payload].gsub(/\s+/, " ")[0, right_w-40]
           else ev[:payload].to_s[0, right_w-40]
           end
    "#{ev[:ts]}  #{kind} #{sid}  #{txt}"
  end
  puts box("Timeline", tl, right_w)
end

.header(text, width) ⇒ Object 



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# File 'lib/vsm/lens/tui.rb', line 71

def self.header(text, width)
  "\e[7m #{text.ljust(width-2)} \e[0m"
end

.start(hub, ring_max: 500) ⇒ Object

Start a simple TUI that renders the last N events and sessions. Usage:

hub = VSM::Lens.attach!(capsule)
VSM::Lens::TUI.start(hub)



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# File 'lib/vsm/lens/tui.rb', line 12

def self.start(hub, ring_max: 500)
  queue, snapshot = hub.subscribe
  ring = snapshot.last(ring_max)

  reader = Thread.new do
    loop { ring << queue.pop; ring.shift if ring.size > ring_max }
  end

  trap("INT")  { exit }
  trap("TERM") { exit }

  STDIN.raw do
    loop do
      draw(ring)
      # Non-blocking single-char read; press 'q' to quit
      ch = if IO.select([STDIN], nil, nil, 0.1) then STDIN.read_nonblock(1) rescue nil end
      exit if ch == "q"
    end
  end
ensure
  reader&.kill
end