Rename FX instance ?

[Nantho]

Hi scripting Gurus !

Does anybody know if there is a way to rename an FX instance with a script ?

Thanks

[OPI]

Just right click the fx and choose rename

[Nantho]

Thanks, but I already knew about that

I was talking about renaming an FX instance with a script cause I'm building a script that needs to be able to do so

[OPI]

ahh makes sense haha. Sometimes the answer is simple. Not this Time!

[mpl]

Parsing/editing track state chunk.

[Nantho]

Thanks mpl, I'm gonna take a look at this, but I'm afraid it's way out of my league

Right now, I'm using a trick : BetterTouchTool takes care of the "renaming" part of the job and the script I'm working on takes it from there. It works like a charm ! But I'd like to share my script with everyone so I must find a work around which uses "script only"...

So now that I've got the right direction, let's get to work

[mpl]

I`m not good at string parsing but this should works (still very dangerous though)

  function SetFXName(track, fx, new_name)
    -- get ref guid
      if not track or not tonumber(fx) then return end
      local FX_GUID = reaper.TrackFX_GetFXGUID( track, fx )
      if not FX_GUID then return else FX_GUID = FX_GUID:gsub('-',''):sub(2,-2) end
      plug_type = reaper.TrackFX_GetIOSize( track, fx )
    -- get chunk t
      local _, chunk = reaper.GetTrackStateChunk( track, '', false )
      local t = {} for line in chunk:gmatch("[^\r\n]+") do t[#t+1] = line end
    -- find edit line
      for i = #t, 1, -1 do
        local t_check = t[i]:gsub('-','')
        if t_check:find(FX_GUID) then search = true  end
        if t[i]:find('<') and search and not t[i]:find('JS_SER') then 
          edited_line = t[i]:sub(2)
          edited_line_id = i
          break
        end
      end
    -- parse line
      if not edited_line then return end
      local t1 = {}
      for word in edited_line:gmatch('[%S]+') do t1[#t1+1] = word end
      t2 = {}
      for i = 1, #t1 do 
        segm = t1[i]
        if not q then t2[#t2+1] = segm else t2[#t2] = t2[#t2]..' '..segm end
        if segm:find('"') and not segm:find('""') then if not q then q = true else q = nil end end
      end
      
      if plug_type == 2 then t2[3] = '"'..new_name..'"' end -- if JS
      if plug_type == 3 then t2[5] = '"'..new_name..'"' end -- if VST
      
      local out_line = table.concat(t2,' ')
      t[edited_line_id] = '<'..out_line
      reaper.SetTrackStateChunk( track, table.concat(t,'\n'), false )
      reaper.UpdateArrange()
  end 
  
-----------------------------------------------------------------------
  
  track = reaper.GetTrack(0,0) 
  fx_id = 2 -- fx is 0-based  
  SetFXName(track, fx_id, 'randomFX')

[Nantho]

Wah !! Thank you so much mpl, you're the Man !

Gonna try this asap and I'll let you know if it works. Anyway, it's a huge step forward and even if it doesn't work, it will certainly put me in the right direction ! Because I have to admit that my last night experiences were'nt so successful