Get directory filelist with Lua io.popen - how?

[mpl]

ok, previously i posted this to a wrong developer forum (or not?) so I post this here again.


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()

Can I do something with os.execute?

[spk77]

Maybe this helps (needs some editing to make it work correctly):

Get file names from current script path.lua

function msg(m)
  return reaper.ShowConsoleMsg(tostring(m) .. "\n")
end

function get_script_path()
  local info = debug.getinfo(1,'S');
  local script_path = info.source:match[[^@?(.*[\/])[^\/]-$]]
  --msg(script_path)
  return script_path
end

-- get "script path"
script_path = get_script_path()

-- Lua implementation of PHP scandir function
function scandir(directory)
    local i, t, popen = 0, {}, io.popen
    for filename in popen('dir "'..directory..'" /b'):lines() do
        msg(filename)
        i = i + 1
        t[i] = filename
    end
    return t
end

file_table = scandir(script_path)

--msg(package.path)

[mpl]

Same thing when appeal to io.popen -

attempt to index a nil value

It needs value, ok. If I do something like

io.popen(directory)

I get

attempt to call a nil value (local 'popen')

script_path is OK, to be clear. So, as i understood, reaper reads io.popen not as a LUA command, but as value in table.

This is I found also: http://www.promixis.com/forums/showt...-not-supported, it is about Lua 5.2, but now we have 5.3, so coult it be missing because of Lua limitations somehow?

[spk77]

What happens if you remove the last "\\" ?
path = reaper.GetExePath().."\\Grooves" .."\\"




Just noticed that this works:
grooves_path = [[C:\Users\Pavillion 11\AppData\Roaming\REAPER\Grooves]]
(this is the path to SWS groove files on my computer)

function msg(m)
  return reaper.ShowConsoleMsg(tostring(m) .. "\n")
end

grooves_path = [[C:\Users\Pavillion 11\AppData\Roaming\REAPER\Grooves]]

-- Lua implementation of PHP scandir function
function scandir(directory)
    local i, t, popen = 0, {}, io.popen
    for filename in popen('dir "'..directory..'" /b'):lines() do
        msg(filename)
        i = i + 1
        t[i] = filename
    end
    return t
end

file_table = scandir(grooves_path)

[mpl]

That is really strange. I just replace my folder into script and got still the same error. And there is no any cyrillic sybols in path, backslash at the end or something.

attempt to index a nil value

on line

    for filename in popen('dir "'..directory..'" /b'):lines() do

Hope it is not because i`m on win7

[spk77]

I'm on Win8.1 64bit.

Made another test:
I made a folder (Grooves) and two files into it (Test file1.txt and Test file2.txt). "Grooves" folder is in the script path.


It's working for me :

function msg(m)
  return reaper.ShowConsoleMsg(tostring(m) .. "\n")
end

--p = reaper.GetExePath()
function get_script_path()
  local info = debug.getinfo(1,'S');
  local script_path = info.source:match[[^@?(.*[\/])[^\/]-$]]
  --msg(script_path)
  return script_path
end

-- get "script path"
script_path = get_script_path()
grooves_path = script_path .. "\\Grooves"

-- Lua implementation of PHP scandir function
function scandir(directory)
    local i, t, popen = 0, {}, io.popen
    for filename in popen('dir "'..directory..'" /b'):lines() do
        msg(filename)
        i = i + 1
        t[i] = filename
    end
    return t
end

--file_table = scandir(script_path)
file_table = scandir(grooves_path)

[mpl]

Variables is ok for me.

I also tried to run REAPER as administrator - same.

UPD. We find a bug.
Reaper 502pre3 x86 - doesn`t work
Reaper 502pre3 x64 - works.

[semiquaver]

I get "'popen' not supported" on mac 64 5.01b3

[semiquaver]

I get a message "'popen' not supported.

Trying to use external processes for text io

thx!

Mac Reaper64

[X-Raym]

It seems that the question was answered few posts ago ! :P
http://forum.cockos.com/showthread.php?t=166043

Sorry, wrong link, here is it is :
http://forum.cockos.com/showthread.php?t=165856

[semiquaver]

in that thread Schwa suggests that io.popen works fine and gives some windows code as an example...

... but here on mac I'm having no luck - so wondering if io.open is supported on windows only??

(the solution to mlp's problem doesn't solve mine sadly )

[schwa]

Merged the threads. There may be a compile issue with enabling Lua's popen on OS X x64, we'll look at it.

For directory listing, this will be moot soon, as we have added file listing functions to the REAPER API for the next build.

For user input, there are a few basic functions in the API already.

[planetnine]

Originally Posted by schwa

...

For directory listing, this will be moot soon, as we have added file listing functions to the REAPER API for the next build.

...

Like the sound of that



>

[schwa]

... fixed popen on OSX for the next build, too.

[X-Raym]

Oh yes that sounds very great, it open a lot of possibility !
Thanks

[semiquaver]

thanks Schwa !

[deeb]

Originally Posted by schwa

For directory listing, this will be moot soon, as we have added file listing functions to the REAPER API for the next build.

hello schwa! where can i read about it?


i am trying to get spk77 example working: but scandir does not msg() anything

tried:
for filename in popen('dir "'..directory..'" /b'):lines() do

also:
for filename in popen('"'..directory..'" /b'):lines() do

i don't find way to get inside the for cycle

Thank you

[karbomusic]

Originally Posted by deeb

hello schwa! where can i read about it?

Have you ran this action yet?

"[developer]Write C++ API functions header"

That tends to have the definitions of all the API functions but since I haven't programmed with Reaper lately, not sure how much it helps. Looks like what you are doing up ^there may be lua syntax related but there is stuff in the API about file listings and lua.

// EnumerateFiles
// List the files in the "path" directory. Returns NULL (or empty string, in Lua) when all files have been listed. See EnumerateSubdirectories

[deeb]

wow man! thanks that's it! very neat