io.popen - is it working with Lua?

[mpl]

Hi.
I need to store table of all files in folder, for example /Reaper/Grooves.
Cant get this works. Can anyone help?

files_t = {}
path = reaper.GetExePath().."\\Grooves" .."\\"
for file in io.popen(path):lines() do     
  table.insert(files_t, file)
end

Error: "attempt to index a nil value"

I also tried this (don`t understand synthax, here could be something wrong), same error:

io.popen([[dir "]]..path..[[" /b]]):lines()

ps: is this forum с++ only, or developer forum also means scripters place ( ReaScript: API: Wish List thread, first questions of The "how do I?" REAPER plug-in extension thread)?

[mpl]

Upd: doesn't work with Reaper x86

[Xenakios]

Doesn't work here but I don't even get an error message.

[schwa]

I don't think you want io.popen, you just want io.open. What your code is doing is trying to execute the list of files and read the output of that nonexistent program, instead of just reading the list of files.

http://www.lua.org/manual/5.3/manual.html#6.8

io.open and file:lines seem to be working properly.

[mpl]

Popen works for me only with Reaper x 64.
Schwa, can you explain how to get list of files in directory, using io.open?
What I need is just store filenames in directory to table, no need to read every file content, just names.

[schwa]

Sorry, I thought you were opening a file that already contained a list of filenames. If you need to list the files within a directory, you will need popen, which is really just way to call a shell command and capture the output.

This should work on Windows. It's equivalent to opening a shell and executing "dir path /b". Other platforms will need different shell commands.

path=reaper.GetResourcePath() .. "\\Grooves"
filelist=io.popen('dir "' .. path .. '" /b')
for filename in filelist:lines() do
  reaper.ShowConsoleMsg(filename ..'\n')
end

[Xenakios]

Would be good if Reaper provided some direct APIs for these pain points...Frankly it's ridiculous one has to execute the operating system directory listing command as an external process to get the file names out of a directory!

[mpl]

Schwa, that is what I`m talking about

attempt to index a nil value (global 'filelist')

But it is working ok with any Reaper x64.

(I`m on Win7x64)

[schwa]

My code example works here on Windows 7 x86 and x64. But shell commands by definition won't be reliably portable. Like Xenakios says, the only way for this to be fully portable would be for us to add file management functions to the API.

[mpl]

Agree. Yes, native implementation of these things would be good.

Hmm, very strange, can`t get it works. Well, anyway, thanks.

Just to say, I need this for my Quantize tool. To let user choose SWS groove from GUI list. If possible to get file from browser "Open file" window, please let me know. Thanks again!

[schwa]

http://www.reaper.fm/sdk/reascript/r...ileNameForRead

[mpl]

Wow, how could I missed that?! Thank you very much.