tags: reaper lua reascript

The purpose here is to take all the items on a track, named `mytrack`, and rename them to
something of the form `myproject_mytrack_001` where `001` is an incrementing counter.

Having sorted through tracks from an old sample CD, categorised them by moving them to a relevant
track (e.g. `hits` or `loops`), I wanted to automatically name them e.g. `loops_001`. This
script **only works when each item has only one take**.

To then mass export, you just select all the times, open the render window, and
select `selected items` and use the wildcard `$item` in the render file name.

## The Code
```lua
local prefix = "samplecdname"

local ntracks = reaper.GetNumTracks()

for i = 0,ntracks-1 do
  local track = reaper.GetTrack(0,i)
  local ret, trname = reaper.GetTrackName(track)
  local nitems = reaper.GetTrackNumMediaItems(track)
  for j = 0,nitems-1 do
    local item = reaper.GetTrackMediaItem(track,j)
    local take = reaper.GetTake(item,0)
    local ret, name = reaper.GetSetMediaItemTakeInfo_String(take,"P_NAME","",false)
    local newname = prefix.."_"..trname.."_"..string.format("%03d",j) -- fine if <1000 items per track
    reaper.GetSetMediaItemTakeInfo_St?ring(take,"P_NAME",newname,true)
  end
end
```

## Render Window
![]{cs}(AutoRenameTakes_MassExport.png)