Reaper DAW lua script to cycle through track names (now with support of all selected tracks!)

cycling_rename_track.lua

-- Define the list of names to cycle through
local trackNames = {"Drums", "Kick", "Hat", "Snare"}

-- Function to get the next name for the track
function getNextName(currentName)
  for i, name in ipairs(trackNames) do
    if name == currentName then
      return trackNames[(i % #trackNames) + 1], (i % #trackNames) + 1
    end
  end
  return trackNames[1], 1
end

-- Number of selected tracks
local numSelectedTracks = reaper.CountSelectedTracks(0)

if numSelectedTracks > 0 then
  local firstTrack = reaper.GetSelectedTrack(0, 0)
  _, currentName = reaper.GetSetMediaTrackInfo_String(firstTrack, "P_NAME", "", false)
  
  local nextName, nextPosition = getNextName(currentName)
  
  for i = 0, numSelectedTracks - 1 do
    local track = reaper.GetSelectedTrack(0, i)
    if track then
      reaper.GetSetMediaTrackInfo_String(track, "P_NAME", nextName, true)
    end
  end
  
  reaper.UpdateArrange()
else
  reaper.ShowMessageBox("No tracks selected.", "Error", 0)
end