stripping and saving parts of a take name?

babag · 07-31-2021, 04:36 PM

i have this line that gets the name of a take in a script:

Code:

local Take_Name = reaper.GetTakeName( Take )

the way i use this, it returns an entire file name, such as "example_file.wav."

i'd like to use part of the file name and strip out the rest, then later use the stripped out part. more specifically, i want to come up with:

Code:

example_file

and

Code:

.wav

as separate variables so that i can create:

Code:

example_file_DENOISED.wav

i assume i need to assign three variables:

Code:

prefix=
append=
suffix=

in order to return:

Code:

example_file
_DENOISED
.wav

no idea how to extract "example_file" and ".wav" though.

thanks for guidance,
babag

dsyrock · 07-31-2021, 09:56 PM

prefix=Take_Name:match('(.+)_[^_%.]+%.%w+')
append=Take_Name:match('.+(_[^_%.]+)%.%w+')
suffix=Take_Name:match('.+_[^_%.]+(%.%w+)')

babag · 07-31-2021, 10:57 PM

thanks, dsyrock. much appreciated.

i'm a complete moron when it comes to this stuff (no offense to morons intended as they're undoubtedly smarter than me about this stuff) but i couldn't get what you posted to work for me.

here's some code i cobbled together from things i found around the intertubes. you'll see how i tried to incorporate what you posted. if you comment out the current regex stuff and uncomment yours it didn't seem to work. the way i have it here, based on things i found floating around the web, did give me the expected result. i have no idea how i might get bitten on the butt by using this in real world situations so any fixes are welcome. here's what i have so far:

Code:

function Msg(variable)
    reaper.ShowConsoleMsg(tostring(variable).."\n")
end

function GetFilePrefix(url)
  return url:match "([^/]$-([^.]+))" -- To match before the .
  --return url:match('(.+)_[^_%.]+%.%w+') -- dsyrock
end

function GetFileExtension(url)
  return url:match "[^.]+$" -- To match after the .
  --return url:match('.+_[^_%.]+(%.%w+)') -- dsyrock
end

function PARSE_TAKE_NAME ()
    reaper.PreventUIRefresh(1)
    reaper.Undo_BeginBlock()

    local num_sel =  reaper.CountSelectedMediaItems( 0 )
    
    for i = 0, num_sel - 1 do
        local item        =  reaper.GetSelectedMediaItem(0, i )
        local take        =  reaper.GetActiveTake( item )
        retval, tk_name   =  reaper.GetSetMediaItemTakeInfo_String( take, "P_NAME", "", 0 )
        tk_name_pre       =  GetFilePrefix( tk_name )
        tk_name_append    =  "_PROCESSED"
        tk_name_ext       =  GetFileExtension( tk_name )
        
        new_tk_name       =  ( tk_name_pre .. tk_name_append .. "." .. tk_name_ext  )
        
        Msg( tk_name )
        Msg( tk_name_pre )
        Msg( tk_name_ext )
        Msg( new_tk_name )
   
    end

    reaper.PreventUIRefresh(-1)
    reaper.UpdateArrange()
    reaper.Undo_EndBlock("Parse take name", -1)
end

PARSE_TAKE_NAME ()

thanks again,
babag