Module: Mxup::ProcessProbe

Defined in:
lib/mxup/process_probe.rb

Overview

Walks the process tree from a pane PID down to the interesting leaf, and reads ‘ps` fields from an arbitrary pid. Used by StatusView to show the actual command the user cares about (not the `zsh -c` wrapping it).

Class Method Summary collapse

Class Method Details

.leaf_pid(pid) ⇒ Object

Follow pgrep -P down the descendant tree until a leaf (no children) is reached. Falls back to the starting pid if pgrep is unavailable.



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# File 'lib/mxup/process_probe.rb', line 12

def leaf_pid(pid)
  current = pid
  loop do
    child = `pgrep -P #{current} 2>/dev/null`.strip.split("\n").first
    break if child.nil? || child.empty?
    current = child.to_i
  end
  current
end

.ps_field(pid, field) ⇒ Object 



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# File 'lib/mxup/process_probe.rb', line 22

def ps_field(pid, field)
  val = `ps -p #{pid} -o #{field}= 2>/dev/null`.strip
  val.empty? ? nil : val
end